From e0e828a5f5e9ae432e618ca997c6a446d0a0a3a3 Mon Sep 17 00:00:00 2001 From: Peter Robinson Date: Mon, 17 Oct 2011 14:32:59 +0100 Subject: [PATCH] initial import --- .gitignore | 1 + draft-ietf-codec-opus-08.txt | 15176 +++++++++++++++++++++++++++++++++ opus.spec | 60 + sources | 1 + 4 files changed, 15238 insertions(+) create mode 100644 draft-ietf-codec-opus-08.txt create mode 100644 opus.spec diff --git a/.gitignore b/.gitignore index e69de29..35b6c0d 100644 --- a/.gitignore +++ b/.gitignore @@ -0,0 +1 @@ +/opus-0.9.6.tar.gz diff --git a/draft-ietf-codec-opus-08.txt b/draft-ietf-codec-opus-08.txt new file mode 100644 index 0000000..3df06c6 --- /dev/null +++ b/draft-ietf-codec-opus-08.txt @@ -0,0 +1,15176 @@ + + + +Network Working Group JM. Valin +Internet-Draft Octasic Inc. +Intended status: Standards Track K. Vos +Expires: February 17, 2012 Skype Technologies S.A. + T. Terriberry + Mozilla Corporation + August 16, 2011 + + + Definition of the Opus Audio Codec + draft-ietf-codec-opus-08 + +Abstract + + This document defines the Opus codec, designed for interactive speech + and audio transmission over the Internet. + +Status of this Memo + + This Internet-Draft is submitted in full conformance with the + provisions of BCP 78 and BCP 79. + + Internet-Drafts are working documents of the Internet Engineering + Task Force (IETF). Note that other groups may also distribute + working documents as Internet-Drafts. The list of current Internet- + Drafts is at http://datatracker.ietf.org/drafts/current/. + + Internet-Drafts are draft documents valid for a maximum of six months + and may be updated, replaced, or obsoleted by other documents at any + time. It is inappropriate to use Internet-Drafts as reference + material or to cite them other than as "work in progress." + + This Internet-Draft will expire on February 17, 2012. + +Copyright Notice + + Copyright (c) 2011 IETF Trust and the persons identified as the + document authors. All rights reserved. + + This document is subject to BCP 78 and the IETF Trust's Legal + Provisions Relating to IETF Documents + (http://trustee.ietf.org/license-info) in effect on the date of + publication of this document. Please review these documents + carefully, as they describe your rights and restrictions with respect + to this document. Code Components extracted from this document must + include Simplified BSD License text as described in Section 4.e of + the Trust Legal Provisions and are provided without warranty as + described in the Simplified BSD License. + + + +Valin, et al. Expires February 17, 2012 [Page 1] + +Internet-Draft Interactive Audio Codec August 2011 + + +Table of Contents + + 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 + 1.1. Notation and Conventions . . . . . . . . . . . . . . . . 5 + 1.1.1. min(x,y) . . . . . . . . . . . . . . . . . . . . . . 5 + 1.1.2. max(x,y) . . . . . . . . . . . . . . . . . . . . . . 5 + 1.1.3. clamp(lo,x,hi) . . . . . . . . . . . . . . . . . . . 5 + 1.1.4. sign(x) . . . . . . . . . . . . . . . . . . . . . . . 5 + 1.1.5. log2(f) . . . . . . . . . . . . . . . . . . . . . . . 6 + 1.1.6. ilog(n) . . . . . . . . . . . . . . . . . . . . . . . 6 + 2. Opus Codec Overview . . . . . . . . . . . . . . . . . . . . . 7 + 3. Codec Modes . . . . . . . . . . . . . . . . . . . . . . . . . 9 + 3.1. The TOC Byte . . . . . . . . . . . . . . . . . . . . . . 9 + 3.2. Frame Packing . . . . . . . . . . . . . . . . . . . . . . 11 + 3.2.1. Frame Length Coding . . . . . . . . . . . . . . . . . 11 + 3.2.2. One Frame in the Packet (Code 0) . . . . . . . . . . 11 + 3.2.3. Two Frames in the Packet, Each with Equal + Compressed Size (Code 1) . . . . . . . . . . . . . . 12 + 3.2.4. Two Frames in the Packet, with Different + Compressed Sizes (Code 2) . . . . . . . . . . . . . . 12 + 3.2.5. An Arbitrary Number of Frames in the Packet + (Code 3) . . . . . . . . . . . . . . . . . . . . . . 13 + 3.3. Examples . . . . . . . . . . . . . . . . . . . . . . . . 15 + 3.4. Extending Opus . . . . . . . . . . . . . . . . . . . . . 16 + 4. Opus Decoder . . . . . . . . . . . . . . . . . . . . . . . . 17 + 4.1. Range Decoder . . . . . . . . . . . . . . . . . . . . . . 17 + 4.1.1. Decoding Symbols . . . . . . . . . . . . . . . . . . 19 + 4.1.2. Alternate Decoding Methods . . . . . . . . . . . . . 20 + 4.1.3. Decoding Raw Bits . . . . . . . . . . . . . . . . . . 22 + 4.1.4. Decoding Uniformly Distributed Integers . . . . . . . 22 + 4.1.5. Current Bit Usage . . . . . . . . . . . . . . . . . . 23 + 4.2. SILK Decoder . . . . . . . . . . . . . . . . . . . . . . 24 + 4.2.1. Decoder Modules . . . . . . . . . . . . . . . . . . . 26 + 4.2.2. Header Bits . . . . . . . . . . . . . . . . . . . . . 28 + 4.2.3. LBRR Flags . . . . . . . . . . . . . . . . . . . . . 28 + 4.2.4. SILK Frame Contents . . . . . . . . . . . . . . . . . 28 + 4.2.5. LBRR Frames . . . . . . . . . . . . . . . . . . . . . 74 + 4.3. CELT Decoder . . . . . . . . . . . . . . . . . . . . . . 75 + 4.3.1. Transient Decoding . . . . . . . . . . . . . . . . . 76 + 4.3.2. Energy Envelope Decoding . . . . . . . . . . . . . . 76 + 4.3.3. Bit allocation . . . . . . . . . . . . . . . . . . . 78 + 4.3.4. Shape Decoder . . . . . . . . . . . . . . . . . . . . 82 + 4.3.5. Anti-collapse processing . . . . . . . . . . . . . . 84 + 4.3.6. Denormalization . . . . . . . . . . . . . . . . . . . 84 + 4.3.7. Inverse MDCT . . . . . . . . . . . . . . . . . . . . 84 + 4.3.8. Packet Loss Concealment (PLC) . . . . . . . . . . . . 85 + 4.4. Mode Switching . . . . . . . . . . . . . . . . . . . . . 85 + 4.4.1. Switching Side Information . . . . . . . . . . . . . 86 + + + +Valin, et al. Expires February 17, 2012 [Page 2] + +Internet-Draft Interactive Audio Codec August 2011 + + + 5. Codec Encoder . . . . . . . . . . . . . . . . . . . . . . . . 88 + 5.1. Range Coder . . . . . . . . . . . . . . . . . . . . . . . 88 + 5.1.1. Encoding Symbols . . . . . . . . . . . . . . . . . . 88 + 5.1.2. Encoding Raw Bits . . . . . . . . . . . . . . . . . . 89 + 5.1.3. Encoding Uniformly Distributed Integers . . . . . . . 90 + 5.1.4. Finalizing the Stream . . . . . . . . . . . . . . . . 90 + 5.1.5. Current Bit Usage . . . . . . . . . . . . . . . . . . 90 + 5.2. SILK Encoder . . . . . . . . . . . . . . . . . . . . . . 91 + 5.2.1. Voice Activity Detection . . . . . . . . . . . . . . 92 + 5.2.2. High-Pass Filter . . . . . . . . . . . . . . . . . . 93 + 5.2.3. Pitch Analysis . . . . . . . . . . . . . . . . . . . 93 + 5.2.4. Noise Shaping Analysis . . . . . . . . . . . . . . . 95 + 5.2.5. Prefilter . . . . . . . . . . . . . . . . . . . . . . 99 + 5.2.6. Prediction Analysis . . . . . . . . . . . . . . . . . 99 + 5.2.7. LSF Quantization . . . . . . . . . . . . . . . . . . 100 + 5.2.8. LTP Quantization . . . . . . . . . . . . . . . . . . 103 + 5.2.9. Noise Shaping Quantizer . . . . . . . . . . . . . . . 104 + 5.2.10. Range Encoder . . . . . . . . . . . . . . . . . . . . 105 + 5.3. CELT Encoder . . . . . . . . . . . . . . . . . . . . . . 105 + 5.3.1. Pre-filter . . . . . . . . . . . . . . . . . . . . . 105 + 5.3.2. Forward MDCT . . . . . . . . . . . . . . . . . . . . 105 + 5.3.3. Bands and Normalization . . . . . . . . . . . . . . . 106 + 5.3.4. Energy Envelope Quantization . . . . . . . . . . . . 106 + 5.3.5. Spherical Vector Quantization . . . . . . . . . . . . 107 + 5.3.6. Stereo support . . . . . . . . . . . . . . . . . . . 108 + 5.3.7. Synthesis . . . . . . . . . . . . . . . . . . . . . . 109 + 5.3.8. Variable Bitrate (VBR) . . . . . . . . . . . . . . . 109 + 6. Conformance . . . . . . . . . . . . . . . . . . . . . . . . . 110 + 7. Security Considerations . . . . . . . . . . . . . . . . . . . 111 + 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 112 + 9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 113 + 10. Informative References . . . . . . . . . . . . . . . . . . . 114 + Appendix A. Reference Implementation . . . . . . . . . . . . . . 116 + A.1. Extracting the source . . . . . . . . . . . . . . . . . . 116 + A.2. Development Versions . . . . . . . . . . . . . . . . . . 116 + A.3. Base64-encoded source code . . . . . . . . . . . . . . . 116 + Appendix B. opus_compare.c . . . . . . . . . . . . . . . . . . . 261 + Appendix C. Self-Delimiting Framing . . . . . . . . . . . . . . 267 + Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 271 + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 3] + +Internet-Draft Interactive Audio Codec August 2011 + + +1. Introduction + + The Opus codec is a real-time interactive audio codec composed of a + linear prediction (LP)-based layer and a Modified Discrete Cosine + Transform (MDCT)-based layer. The main idea behind using two layers + is that in speech, linear prediction techniques (such as CELP) code + low frequencies more efficiently than transform (e.g., MDCT) domain + techniques, while the situation is reversed for music and higher + speech frequencies. Thus a codec with both layers available can + operate over a wider range than either one alone and, by combining + them, achieve better quality than either one individually. + + The primary normative part of this specification is provided by the + source code in Appendix A. In general, only the decoder portion of + this software is normative, though a significant amount of code is + shared by both the encoder and decoder. The decoder contains + significant amounts of integer and fixed-point arithmetic which must + be performed exactly, including all rounding considerations, so any + useful specification must make extensive use of domain-specific + symbolic language to adequately define these operations. + Additionally, any conflict between the symbolic representation and + the included reference implementation must be resolved. For the + practical reasons of compatibility and testability it would be + advantageous to give the reference implementation priority in any + disagreement. The C language is also one of the most widely + understood human-readable symbolic representations for machine + behavior. For these reasons this RFC uses the reference + implementation as the sole symbolic representation of the codec. + + While the symbolic representation is unambiguous and complete it is + not always the easiest way to understand the codec's operation. For + this reason this document also describes significant parts of the + codec in English and takes the opportunity to explain the rationale + behind many of the more surprising elements of the design. These + descriptions are intended to be accurate and informative, but the + limitations of common English sometimes result in ambiguity, so it is + expected that the reader will always read them alongside the symbolic + representation. Numerous references to the implementation are + provided for this purpose. The descriptions sometimes differ from + the reference in ordering or through mathematical simplification + wherever such deviation makes an explanation easier to understand. + For example, the right shift and left shift operations in the + reference implementation are often described using division and + multiplication in the text. In general, the text is focused on the + "what" and "why" while the symbolic representation most clearly + provides the "how". + + + + + +Valin, et al. Expires February 17, 2012 [Page 4] + +Internet-Draft Interactive Audio Codec August 2011 + + +1.1. Notation and Conventions + + The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", + "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this + document are to be interpreted as described in RFC 2119. + + Even when using floating-point, various operations in the codec + require bit-exact fixed-point behavior. The notation "Q", where n + is an integer, denotes the number of binary digits to the right of + the decimal point in a fixed-point number. For example, a signed Q14 + value in a 16-bit word can represent values from -2.0 to + 1.99993896484375, inclusive. This notation is for informational + purposes only. Arithmetic, when described, always operates on the + underlying integer. E.g., the text will explicitly indicate any + shifts required after a multiplication. + + Expressions, where included in the text, follow C operator rules and + precedence, with the exception that syntax like "2**n" is used to + indicate 2 raised to the power n. The text also makes use of the + following functions: + +1.1.1. min(x,y) + + The smallest of two values x and y. + +1.1.2. max(x,y) + + The largest of two values x and y. + +1.1.3. clamp(lo,x,hi) + + clamp(lo,x,hi) = max(lo,min(x,hi)) + + With this definition, if lo>hi, the lower bound is the one that is + enforced. + +1.1.4. sign(x) + + The sign of x, i.e., + + ( -1, x < 0 , + sign(x) = < 0, x == 0 , + ( 1, x > 0 . + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 5] + +Internet-Draft Interactive Audio Codec August 2011 + + +1.1.5. log2(f) + + The base-two logarithm of f. + +1.1.6. ilog(n) + + The minimum number of bits required to store a positive integer n in + two's complement notation, or 0 for a non-positive integer n. + + ( 0, n <= 0, + ilog(n) = < + ( floor(log2(n))+1, n > 0 + + Examples: + + o ilog(-1) = 0 + + o ilog(0) = 0 + + o ilog(1) = 1 + + o ilog(2) = 2 + + o ilog(3) = 2 + + o ilog(4) = 3 + + o ilog(7) = 3 + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 6] + +Internet-Draft Interactive Audio Codec August 2011 + + +2. Opus Codec Overview + + The Opus codec scales from 6 kb/s narrowband mono speech to 510 kb/s + fullband stereo music, with algorithmic delays ranging from 5 ms to + 65.2 ms. At any given time, either the LP layer, the MDCT layer, or + both, may be active. It can seamlessly switch between all of its + various operating modes, giving it a great deal of flexibility to + adapt to varying content and network conditions without renegotiating + the current session. Internally, the codec always operates at a + 48 kHz sampling rate, though it allows input and output of various + bandwidths, defined as follows: + + +----------------------+-----------------+--------------------------+ + | Abbreviation | Audio Bandwidth | Sampling Rate | + | | | (Effective) | + +----------------------+-----------------+--------------------------+ + | NB (narrowband) | 4 kHz | 8 kHz | + | | | | + | MB (medium-band) | 6 kHz | 12 kHz | + | | | | + | WB (wideband) | 8 kHz | 16 kHz | + | | | | + | SWB (super-wideband) | 12 kHz | 24 kHz | + | | | | + | FB (fullband) | 20 kHz | 48 kHz | + +----------------------+-----------------+--------------------------+ + + These can be chosen independently on the encoder and decoder side, + e.g., a fullband signal can be decoded as wideband, or vice versa. + This approach ensures a sender and receiver can always interoperate, + regardless of the capabilities of their actual audio hardware. + + The LP layer is based on the SILK [1] codec [SILK]. It supports NB, + MB, or WB audio and frame sizes from 10 ms to 60 ms, and requires an + additional 5.2 ms look-ahead for noise shaping estimation (5 ms) and + internal resampling (0.2 ms). Like Vorbis and many other modern + codecs, SILK is inherently designed for variable-bitrate (VBR) + coding, though an encoder can with sufficient effort produce + constant-bitrate (CBR) or near-CBR streams. + + The MDCT layer is based on the CELT [2] codec [CELT]. It supports + sampling NB, WB, SWB, or FB audio and frame sizes from 2.5 ms to + 20 ms, and requires an additional 2.5 ms look-ahead due to the + overlapping MDCT windows. The CELT codec is inherently designed for + CBR coding, but unlike many CBR codecs it is not limited to a set of + predetermined rates. It internally allocates bits to exactly fill + any given target budget, and an encoder can produce a VBR stream by + varying the target on a per-frame basis. The MDCT layer is not used + + + +Valin, et al. Expires February 17, 2012 [Page 7] + +Internet-Draft Interactive Audio Codec August 2011 + + + for speech when the audio bandwidth is WB or less, as it is not + useful there. On the other hand, non-speech signals are not always + adequately coded using linear prediction, so for music only the MDCT + layer should be used. + + A hybrid mode allows the use of both layers simultaneously with a + frame size of 10 or 20 ms and a SWB or FB audio bandwidth. Each + frame is split into a low frequency signal and a high frequency + signal, with a cutoff of 8 kHz. The LP layer then codes the low + frequency signal, followed by the MDCT layer coding the high + frequency signal. In the MDCT layer, all bands below 8 kHz are + discarded, so there is no coding redundancy between the two layers. + + At the decoder, the two decoder outputs are simply added together. + To compensate for the different look-aheads required by each layer, + the CELT encoder input is delayed by an additional 2.7 ms. This + ensures that low frequencies and high frequencies arrive at the same + time. This extra delay MAY be reduced by an encoder by using less + lookahead for noise shaping or using a simpler resampler in the LP + layer, but this will reduce quality. However, the base 2.5 ms look- + ahead in the CELT layer cannot be reduced in the encoder because it + is needed for the MDCT overlap, whose size is fixed by the decoder. + + Both layers use the same entropy coder, avoiding any waste from + "padding bits" between them. The hybrid approach makes it easy to + support both CBR and VBR coding. Although the LP layer is VBR, the + bit allocation of the MDCT layer can produce a final stream that is + CBR by using all the bits left unused by the LP layer. + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 8] + +Internet-Draft Interactive Audio Codec August 2011 + + +3. Codec Modes + + As described, the two layers can be combined in three possible + operating modes: + + 1. A LP-only mode for use in low bitrate connections with an audio + bandwidth of WB or less, + + 2. A hybrid (LP+MDCT) mode for SWB or FB speech at medium bitrates, + and + + 3. An MDCT-only mode for very low delay speech transmission as well + as music transmission. + + A single packet may contain multiple audio frames, however they must + share a common set of parameters, including the operating mode, audio + bandwidth, frame size, and channel count. This section describes the + possible combinations of these parameters and the internal framing + used to pack multiple frames into a single packet. This framing is + not self-delimiting. Instead, it assumes that a higher layer (such + as UDP or RTP or Ogg or Matroska) will communicate the length, in + bytes, of the packet, and it uses this information to reduce the + framing overhead in the packet itself. A decoder implementation MUST + support the framing described in this section. An alternative, self- + delimiting variant of the framing is described in Appendix C. + Support for that variant is OPTIONAL. + +3.1. The TOC Byte + + An Opus packet begins with a single-byte table-of-contents (TOC) + header that signals which of the various modes and configurations a + given packet uses. It is composed of a frame count code, "c", a + stereo flag, "s", and a configuration number, "config", arranged as + illustrated in Figure 1. A description of each of these fields + follows. + + 0 + 0 1 2 3 4 5 6 7 + +-+-+-+-+-+-+-+-+ + | c |s| config | + +-+-+-+-+-+-+-+-+ + + Figure 1: The TOC byte + + The top five bits of the TOC byte, labeled "config", encode one of 32 + possible configurations of operating mode, audio bandwidth, and frame + size. Table 1 lists the parameters for each configuration. + + + + +Valin, et al. Expires February 17, 2012 [Page 9] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-----------------------+-----------+-----------+-------------------+ + | Configuration | Mode | Bandwidth | Frame Size(s) | + | Number(s) | | | | + +-----------------------+-----------+-----------+-------------------+ + | 0...3 | LP-only | NB | 10, 20, 40, 60 ms | + | | | | | + | 4...7 | LP-only | MB | 10, 20, 40, 60 ms | + | | | | | + | 8...11 | LP-only | WB | 10, 20, 40, 60 ms | + | | | | | + | 12...13 | Hybrid | SWB | 10, 20 ms | + | | | | | + | 14...15 | Hybrid | FB | 10, 20 ms | + | | | | | + | 16...19 | MDCT-only | NB | 2.5, 5, 10, 20 ms | + | | | | | + | 20...23 | MDCT-only | WB | 2.5, 5, 10, 20 ms | + | | | | | + | 24...27 | MDCT-only | SWB | 2.5, 5, 10, 20 ms | + | | | | | + | 28...31 | MDCT-only | FB | 2.5, 5, 10, 20 ms | + +-----------------------+-----------+-----------+-------------------+ + + Table 1: TOC Byte Configuration Parameters + + One additional bit, labeled "s", is used to signal mono vs. stereo, + with 0 indicating mono and 1 indicating stereo. + + The remaining two bits of the TOC byte, labeled "c", code the number + of frames per packet (codes 0 to 3) as follows: + + o 0: 1 frame in the packet + + o 1: 2 frames in the packet, each with equal compressed size + + o 2: 2 frames in the packet, with different compressed sizes + + o 3: an arbitrary number of frames in the packet + + This draft refers to a packet as a code 0 packet, code 1 packet, + etc., based on the value of "c". + + A well-formed Opus packet MUST contain at least one byte with the TOC + information, though the frame(s) within a packet MAY be zero bytes + long. + + + + + + +Valin, et al. Expires February 17, 2012 [Page 10] + +Internet-Draft Interactive Audio Codec August 2011 + + +3.2. Frame Packing + + This section describes how frames are packed according to each + possible value of "c" in the TOC byte. + +3.2.1. Frame Length Coding + + When a packet contains multiple VBR frames, the compressed length of + one or more of these frames is indicated with a one or two byte + sequence, with the meaning of the first byte as follows: + + o 0: No frame (DTX or lost packet) + + o 1...251: Size of the frame in bytes + + o 252...255: A second byte is needed. The total size is + (size[1]*4)+size[0] + + The maximum representable size is 255*4+255=1275 bytes. This limit + MUST NOT be exceeded, even when no length field is used. For 20 ms + frames, this represents a bitrate of 510 kb/s, which is approximately + the highest useful rate for lossily compressed fullband stereo music. + Beyond this point, lossless codecs are more appropriate. It is also + roughly the maximum useful rate of the MDCT layer, as shortly + thereafter quality no longer improves with additional bits due to + limitations on the codebook sizes. + + No length is transmitted for the last frame in a VBR packet, or any + of the frames in a CBR packet, as it can be inferred from the total + size of the packet and the size of all other data in the packet. + However, the length of any individual frame MUST NOT exceed + 1275 bytes, to allow for repacketization by gateways, conference + bridges, or other software. + +3.2.2. One Frame in the Packet (Code 0) + + For code 0 packets, the TOC byte is immediately followed by N-1 bytes + of compressed data for a single frame (where N is the size of the + packet), as illustrated in Figure 2. + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 11] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |0|0|s| config | | + +-+-+-+-+-+-+-+-+ | + | Compressed frame 1 (N-1 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 2: A Code 0 Packet + +3.2.3. Two Frames in the Packet, Each with Equal Compressed Size + (Code 1) + + For code 1 packets, the TOC byte is immediately followed by the + (N-1)/2 bytes of compressed data for the first frame, followed by + (N-1)/2 bytes of compressed data for the second frame, as illustrated + in Figure 3. The number of payload bytes available for compressed + data, N-1, MUST be even for all code 1 packets. + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|0|s| config | | + +-+-+-+-+-+-+-+-+ : + | Compressed frame 1 ((N-1)/2 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 2 ((N-1)/2 bytes)... | + : +-+-+-+-+-+-+-+-+ + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 3: A Code 1 Packet + +3.2.4. Two Frames in the Packet, with Different Compressed Sizes + (Code 2) + + For code 2 packets, the TOC byte is followed by a one or two byte + sequence indicating the length of the first frame (marked N1 in the + figure below), followed by N1 bytes of compressed data for the first + frame. The remaining N-N1-2 or N-N1-3 bytes are the compressed data + for the second frame. This is illustrated in Figure 4. The length + of the first frame, N1, MUST be no larger than the size of the + payload remaining after decoding that length for all code 2 packets. + + + + +Valin, et al. Expires February 17, 2012 [Page 12] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |0|1|s| config | N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 2... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 4: A Code 2 Packet + +3.2.5. An Arbitrary Number of Frames in the Packet (Code 3) + + Code 3 packets may encode an arbitrary number of packets, as well as + additional padding, called "Opus padding" to indicate that this + padding is added at the Opus layer, rather than at the transport + layer. For code 3 packets, the TOC byte is followed by a byte + encoding the number of frames in the packet in bits 0 to 5 (marked + "M" in the figure below), with bit 6 indicating whether or not Opus + padding is inserted (marked "p" in the figure below), and bit 7 + indicating VBR (marked "v" in the figure below). M MUST NOT be zero, + and the audio duration contained within a packet MUST NOT exceed + 120 ms. This limits the maximum frame count for any frame size to 48 + (for 2.5 ms frames), with lower limits for longer frame sizes. + Figure 5 illustrates the layout of the frame count byte. + + 0 + 0 1 2 3 4 5 6 7 + +-+-+-+-+-+-+-+-+ + | M |p|v| + +-+-+-+-+-+-+-+-+ + + Figure 5: The frame count byte + + When Opus padding is used, the number of bytes of padding is encoded + in the bytes following the frame count byte. Values from 0...254 + indicate that 0...254 bytes of padding are included, in addition to + the byte(s) used to indicate the size of the padding. If the value + is 255, then the size of the additional padding is 254 bytes, plus + the padding value encoded in the next byte. The additional padding + bytes appear at the end of the packet, and SHOULD be set to zero by + the encoder, however the decoder MUST accept any value for the + padding bytes. By using code 255 multiple times, it is possible to + + + +Valin, et al. Expires February 17, 2012 [Page 13] + +Internet-Draft Interactive Audio Codec August 2011 + + + create a packet of any specific, desired size. Let P be the total + amount of padding, including both the trailing padding bytes + themselves and the header bytes used to indicate how many there are. + Then P MUST be no more than N-2 for CBR packets, or N-M-1 for VBR + packets. + + In the CBR case, the compressed length of each frame in bytes is + equal to the number of remaining bytes in the packet after + subtracting the (optional) padding, (N-2-P), divided by M. This + number MUST be an integer multiple of M. The compressed data for all + M frames then follows, each of size (N-2-P)/M bytes, as illustrated + in Figure 6. + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|s| config | M |p|0| Padding length (Optional) : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 1 ((N-2-P)/M bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 2 ((N-2-P)/M bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : ... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame M ((N-2-P)/M bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : Opus Padding (Optional)... | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 6: A CBR Code 3 Packet + + In the VBR case, the (optional) padding length is followed by M-1 + frame lengths (indicated by "N1" to "N[M-1]" in the figure below), + each encoded in a one or two byte sequence as described above. The + packet MUST contain enough data for the M-1 lengths after the + (optional) padding, and the sum of these lengths MUST be no larger + than the number of bytes remaining in the packet after decoding them. + The compressed data for all M frames follows, each frame consisting + of the indicated number of bytes, with the final frame consuming any + remaining bytes before the final padding, as illustrated in Figure 6. + + + +Valin, et al. Expires February 17, 2012 [Page 14] + +Internet-Draft Interactive Audio Codec August 2011 + + + The number of header bytes (TOC byte, frame count byte, padding + length bytes, and frame length bytes), plus the length of the first + M-1 frames themselves, plus the length of the padding MUST be no + larger than N, the total size of the packet. + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|s| config | M |p|1| Padding length (Optional) : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : N1 (1-2 bytes): N2 (1-2 bytes): ... : N[M-1] | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 1 (N1 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 2 (N2 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : ... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame M... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : Opus Padding (Optional)... | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 7: A VBR Code 3 Packet + +3.3. Examples + + Simplest case, one NB mono 20 ms SILK frame: + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |0|0|0| 1 | compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Two FB mono 5 ms CELT frames of the same compressed size: + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 15] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|0|0| 29 | compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Two FB mono 20 ms hybrid frames of different compressed size: + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|0| 15 | 2 |0|1| N1 | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Four FB stereo 20 ms CELT frames of the same compressed size: + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|1| 31 | 4 |0|0| compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + +3.4. Extending Opus + + A receiver MUST NOT process packets which violate the rules above as + normal Opus packets. They are reserved for future applications, such + as in-band headers (containing metadata, etc.) or multichannel + support. + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 16] + +Internet-Draft Interactive Audio Codec August 2011 + + +4. Opus Decoder + + The Opus decoder consists of two main blocks: the SILK decoder and + the CELT decoder. The output of the Opus decode is the sum of the + outputs from the SILK and CELT decoders with proper sample rate + conversion and delay compensation as illustrated in the block diagram + below. At any given time, one or both of the SILK and CELT decoders + may be active. + + + +-------+ +----------+ + | SILK | | sample | + +->|decoder|--->| rate |----+ + bit- +-------+ | | | |conversion| v + stream | Range |---+ +-------+ +----------+ /---\ audio + ------->|decoder| | + |------> + | |---+ +-------+ +----------+ \---/ + +-------+ | | CELT | | Delay | ^ + +->|decoder|----| compens- |----+ + | | | ation | + +-------+ +----------+ + + +4.1. Range Decoder + + Opus uses an entropy coder based on [range-coding], which is itself a + rediscovery of the FIFO arithmetic code introduced by + [coding-thesis]. It is very similar to arithmetic encoding, except + that encoding is done with digits in any base instead of with bits, + so it is faster when using larger bases (i.e., an octet). All of the + calculations in the range coder must use bit-exact integer + arithmetic. + + Symbols may also be coded as "raw bits" packed directly into the + bitstream, bypassing the range coder. These are packed backwards + starting at the end of the frame, as illustrated in Figure 8. This + reduces complexity and makes the stream more resilient to bit errors, + as corruption in the raw bits will not desynchronize the decoding + process, unlike corruption in the input to the range decoder. Raw + bits are only used in the CELT layer. + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 17] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Range coder data (packed MSb to LSb) -> : + + + + : : + + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : | <- Boundary occurs at an arbitrary bit position : + +-+-+-+ + + : <- Raw bits data (packed LSb to MSb) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 8: Illustrative example of packing range coder and raw bits + data + + Each symbol coded by the range coder is drawn from a finite alphabet + and coded in a separate "context", which describes the size of the + alphabet and the relative frequency of each symbol in that alphabet. + Opus only uses static contexts. They are not adapted to the + statistics of the data as it is coded. + + Suppose there is a context with n symbols, identified with an index + that ranges from 0 to n-1. The parameters needed to encode or decode + a symbol in this context are represented by a three-tuple + (fl[k], fh[k], ft), with 0 <= fl[k] < fh[k] <= ft <= 65535. The + values of this tuple are derived from the probability model for the + symbol, represented by traditional "frequency counts" (although, + since Opus uses static contexts, these are not updated as symbols are + decoded). Let f[i] be the frequency of symbol i. Then the three- + tuple corresponding to symbol k is given by + + k-1 n-1 + __ __ + fl[k] = \ f[i], fh[k] = fl[k] + f[k], ft[k] = \ f[i] + /_ /_ + i=0 i=0 + + The range decoder extracts the symbols and integers encoded using the + range encoder in Section 5.1. The range decoder maintains an + internal state vector composed of the two-tuple (val,rng), + representing the difference between the high end of the current range + and the actual coded value, minus one, and the size of the current + range, respectively. Both val and rng are 32-bit unsigned integer + values. The decoder initializes rng to 128 and initializes val to + 127 minus the top 7 bits of the first input octet. The remaining bit + is saved for use in the renormalization procedure described in + Section 4.1.1.1, which the decoder invokes immediately after + initialization to read additional bits and establish the invariant + + + +Valin, et al. Expires February 17, 2012 [Page 18] + +Internet-Draft Interactive Audio Codec August 2011 + + + that rng > 2**23. + +4.1.1. Decoding Symbols + + Decoding a symbol is a two-step process. The first step determines a + 16-bit unsigned value fs, which lies within the range of some symbol + in the current context. The second step updates the range decoder + state with the three-tuple (fl[k], fh[k], ft) corresponding to that + symbol. + + The first step is implemented by ec_decode() (entdec.c), which + computes + + fs = ft - min(val/(rng/ft)+1, ft) . + + The divisions here are exact integer division. + + The decoder then identifies the symbol in the current context + corresponding to fs; i.e., the value of k whose three-tuple + (fl[k], fh[k], ft) satisfies fl[k] <= fs < fh[k]. It uses this tuple + to update val according to + + val = val - (rng/ft)*(ft-fh[k]) . + + If fl[k] is greater than zero, then the decoder updates rng using + + rng = (rng/ft)*(fh[k]-fl[k]) . + + Otherwise, it updates rng using + + rng = rng - (rng/ft)*(ft-fh[k]). + + Using a special case for the first symbol, rather than the last + symbol, as is commonly done in other arithmetic coders, ensures that + all the truncation error from the finite precision arithmetic + accumulates in symbol 0. This makes the cost of coding a 0 slightly + smaller, on average, than its estimated probability indicates and + makes the cost of coding any other symbol slightly larger. When + contexts are designed so that 0 is the most probable symbol, which is + often the case, this strategy minimizes the inefficiency introduced + by the finite precision. It also makes some of the special-case + decoding routines in Section 4.1.2 particularly simple. + + After the updates, implemented by ec_dec_update() (entdec.c), the + decoder normalizes the range using the procedure in the next section, + and returns the index k. + + + + + +Valin, et al. Expires February 17, 2012 [Page 19] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.1.1.1. Renormalization + + To normalize the range, the decoder repeats the following process, + implemented by ec_dec_normalize() (entdec.c), until rng > 2**23. If + rng is already greater than 2**23, the entire process is skipped. + First, it sets rng to (rng<<8). Then it reads the next octet of the + payload and combines it with the left-over bit buffered from the + previous octet to form the 8-bit value sym. It takes the left-over + bit as the high bit (bit 7) of sym, and the top 7 bits of the octet + it just read as the other 7 bits of sym. The remaining bit in the + octet just read is buffered for use in the next iteration. If no + more input octets remain, it uses zero bits instead. Then, it sets + + val = ((val<<8) + (255-sym)) & 0x7FFFFFFF . + + It is normal and expected that the range decoder will read several + bytes into the raw bits data (if any) at the end of the packet by the + time the frame is completely decoded, as illustrated in Figure 9. + This same data MUST also be returned as raw bits when requested. The + encoder is expected to terminate the stream in such a way that the + decoder will decode the intended values regardless of the data + contained in the raw bits. Section 5.1.4 describes a procedure for + doing this. If the range decoder consumes all of the bytes belonging + to the current frame, it MUST continue to use zero when any further + input bytes are required, even if there is additional data in the + current packet from padding or other frames. + + n n+1 n+2 n+3 + 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : | <----------- Overlap region ------------> | : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ^ ^ + | End of data buffered by the range coder | + ...-----------------------------------------------+ + | + | End of data consumed by raw bits + +-------------------------------------------------------... + + Figure 9: Illustrative example of raw bits overlapping range coder + data + +4.1.2. Alternate Decoding Methods + + The reference implementation uses three additional decoding methods + that are exactly equivalent to the above, but make assumptions and + simplifications that allow for a more efficient implementation. + + + + +Valin, et al. Expires February 17, 2012 [Page 20] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.1.2.1. ec_decode_bin() + + The first is ec_decode_bin() (entdec.c), defined using the parameter + ftb instead of ft. It is mathematically equivalent to calling + ec_decode() with ft = (1<>ftb-8)+1), the decoder state is updated using + the three-tuple (t,t+1,(ft-1>>ftb-8)+1), and the remaining bits are + decoded as raw bits, setting t = t<= ft, then the current frame is corrupt. In that + case, the decoder should assume there has been an error in the + coding, decoding, or transmission and SHOULD take measures to conceal + the error and/or report to the application that a problem has + occurred. + +4.1.5. Current Bit Usage + + The bit allocation routines in the CELT decoder need a conservative + upper bound on the number of bits that have been used from the + current frame thus far, including both range coder bits and raw bits. + This drives allocation decisions that must match those made in the + encoder. The upper bound is computed in the reference implementation + to whole-bit precision by the function ec_tell() (entcode.h) and to + fractional 1/8th bit precision by the function ec_tell_frac() + (entcode.c). Like all operations in the range coder, it must be + implemented in a bit-exact manner, and must produce exactly the same + value returned by the same functions in the encoder after encoding + the same symbols. + + ec_tell() is guaranteed to return ceil(ec_tell_frac()/8.0). In + various places the codec will check to ensure there is enough room to + contain a symbol before attempting to decode it. In practice, + although the number of bits used so far is an upper bound, decoding a + symbol whose probability model suggests it has a worst-case cost of p + 1/8th bits may actually advance the return value of ec_tell_frac() by + p-1, p, or p+1 1/8th bits, due to approximation error in that upper + bound, truncation error in the range coder, and for large values of + ft, modeling error in ec_dec_uint(). + + However, this error is bounded, and periodic calls to ec_tell() or + ec_tell_frac() at precisely defined points in the decoding process + prevent it from accumulating. For a symbol that requires a whole + number of bits (i.e., ft/(fh[k]-fl[k]) is a power of two, including + values of ft larger than 2**8 with ec_dec_uint()), and there are at + least p 1/8th bits available, decoding the symbol will never advance + the decoder past the end of the frame, i.e., will never "bust" the + budget. Frames contain a whole number of bits, and the return value + of ec_tell_frac() will only advance by more than p 1/8th bits in this + case if there was a fractional number of bits remaining, and by no + more than the fractional part. However, when p is not a whole number + of bits, an extra 1/8th bit is required to ensure decoding the symbol + + + +Valin, et al. Expires February 17, 2012 [Page 23] + +Internet-Draft Interactive Audio Codec August 2011 + + + will not bust. + + The reference implementation keeps track of the total number of whole + bits that have been processed by the decoder so far in a variable + nbits_total, including the (possibly fractional number of bits) that + are currently buffered (but not consumed) inside the range coder. + nbits_total is initialized to 33 just after the initial range + renormalization process completes (or equivalently, it can be + initialized to 9 before the first renormalization). The extra two + bits over the actual amount buffered by the range coder guarantees + that it is an upper bound and that there is enough room for the + encoder to terminate the stream. Each iteration through the range + coder's renormalization loop increases nbits_total by 8. Reading raw + bits increases nbits_total by the number of raw bits read. + +4.1.5.1. ec_tell() + + The whole number of bits buffered in rng may be estimated via l = + ilog(rng). ec_tell() then becomes a simple matter of removing these + bits from the total. It returns (nbits_total - l). + + In a newly initialized decoder, before any symbols have been read, + this reports that 1 bit has been used. This is the bit reserved for + termination of the encoder. + +4.1.5.2. ec_tell_frac() + + ec_tell_frac() estimates the number of bits buffered in rng to + fractional precision. Since rng must be greater than 2**23 after + renormalization, l must be at least 24. Let r = rng>>(l-16), so that + 32768 <= r < 65536, an unsigned Q15 value representing the fractional + part of rng. Then the following procedure can be used to add one bit + of precision to l. First, update r = r*r>>15. Then add the 16th bit + of r to l via l = 2*l + (r>>16). Finally, if this bit was a 1, + reduce r by a factor of two via r = r>>1, so that it once again lies + in the range 32768 <= r < 65536. + + This procedure is repeated three times to extend l to 1/8th bit + precision. ec_tell_frac() then returns (nbits_total*8 - l). + +4.2. SILK Decoder + + The decoder's LP layer uses a modified version of the SILK codec + (herein simply called "SILK"), which runs a decoded excitation signal + through adaptive long-term and short-term prediction synthesis + filters. It runs in NB, MB, and WB modes internally. When used in a + hybrid frame in SWB or FB mode, the LP layer itself still only runs + in WB mode. + + + +Valin, et al. Expires February 17, 2012 [Page 24] + +Internet-Draft Interactive Audio Codec August 2011 + + + Internally, the LP layer of a single Opus frame is composed of either + a single 10 ms SILK frame or between one and three 20 ms SILK frames. + Each SILK frame is in turn composed of either two or four 5 ms + subframes. Optional Low Bit-Rate Redundancy (LBRR) frames, which are + reduced-bitrate encodings of previous SILK frames, may appear to aid + in recovery from packet loss. If present, these appear before the + regular SILK frames. They are in most respects identical to regular + active SILK frames, except that they are usually encoded with a lower + bitrate, and from here on this draft will use "SILK frame" to refer + to either one and "regular SILK frame" if it needs to draw a + distinction between the two. + + All of these frames and subframes are decoded from the same range + coder, with no padding between them. Thus packing multiple SILK + frames in a single Opus frame saves, on average, half a byte per SILK + frame. It also allows some parameters to be predicted from prior + SILK frames in the same Opus frame, since this does not degrade + packet loss robustness (beyond any penalty for merely using fewer, + larger packets to store multiple frames). + + Stereo support in SILK uses a variant of mid-side coding, allowing a + mono decoder to simply decode the mid channel. However, the data for + the two channels is interleaved, so a mono decoder must still unpack + the data for the side channel. It would be required to do so anyway + for hybrid Opus frames, or to support decoding individual 20 ms + frames. + + +----------------------+-----------------+---------------+ + | Symbol(s) | PDF | Condition | + +----------------------+-----------------+---------------+ + | VAD flags | {1, 1}/2 | | + | | | | + | LBRR flag | {1, 1}/2 | | + | | | | + | Per-frame LBRR flags | Section 4.2.3 | Section 4.2.3 | + | | | | + | Frame Type | Section 4.2.4.1 | | + | | | | + | Gain index | Section 4.2.4.2 | | + +----------------------+-----------------+---------------+ + + Order of the symbols in the SILK section of the bit-stream. + + Table 2 + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 25] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.1. Decoder Modules + + An overview of the decoder is given in Figure 10. + + + + +---------+ +------------+ + -->| Range |--->| Decode |---------------------------+ + 1 | Decoder | 2 | Parameters |----------+ 5 | + +---------+ +------------+ 4 | | + 3 | | | + \/ \/ \/ + +------------+ +------------+ +------------+ + | Generate |-->| LTP |-->| LPC |--> + | Excitation | | Synthesis | | Synthesis | 6 + +------------+ +------------+ +------------+ + + 1: Range encoded bitstream + 2: Coded parameters + 3: Pulses and gains + 4: Pitch lags and LTP coefficients + 5: LPC coefficients + 6: Decoded signal + + + Decoder block diagram. + + Figure 10 + +4.2.1.1. Range Decoder + + The range decoder decodes the encoded parameters from the received + bitstream. Output from this function includes the pulses and gains + for the excitation signal generation, as well as LTP and LSF codebook + indices, which are needed for decoding LTP and LPC coefficients + needed for LTP and LPC synthesis filtering the excitation signal, + respectively. + +4.2.1.2. Decode Parameters + + Pulses and gains are decoded from the parameters that were decoded by + the range decoder. + + When a voiced frame is decoded and LTP codebook selection and indices + are received, LTP coefficients are decoded using the selected + codebook by choosing the vector that corresponds to the given + codebook index in that codebook. This is done for each of the four + subframes. The LPC coefficients are decoded from the LSF codebook by + + + +Valin, et al. Expires February 17, 2012 [Page 26] + +Internet-Draft Interactive Audio Codec August 2011 + + + first adding the chosen LSF vector and the decoded LSF residual + signal. The resulting LSF vector is stabilized using the same method + that was used in the encoder, see Section 5.2.7.5. The LSF + coefficients are then converted to LPC coefficients, and passed on to + the LPC synthesis filter. + +4.2.1.3. Generate Excitation + + The pulses signal is multiplied with the quantization gain to create + the excitation signal. + +4.2.1.4. LTP Synthesis + + For voiced speech, the excitation signal e(n) is input to an LTP + synthesis filter that will recreate the long term correlation that + was removed in the LTP analysis filter and generate an LPC excitation + signal e_LPC(n), according to + + + d + __ + e_LPC(n) = e(n) + \ e_LPC(n - L - i) * b_i, + /_ + i=-d + + + using the pitch lag L, and the decoded LTP coefficients b_i. The + number of LTP coefficients is 5, and thus d = 2. For unvoiced + speech, the output signal is simply a copy of the excitation signal, + i.e., e_LPC(n) = e(n). + +4.2.1.5. LPC Synthesis + + In a similar manner, the short-term correlation that was removed in + the LPC analysis filter is recreated in the LPC synthesis filter. + The LPC excitation signal e_LPC(n) is filtered using the LTP + coefficients a_i, according to + + + d_LPC + __ + y(n) = e_LPC(n) + \ y(n - i) * a_i, + /_ + i=1 + + + where d_LPC is the LPC synthesis filter order, and y(n) is the + decoded output signal. + + + +Valin, et al. Expires February 17, 2012 [Page 27] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.2. Header Bits + + The LP layer begins with two to eight header bits, decoded in + silk_Decode() (silk_dec_API.c). These consist of one Voice Activity + Detection (VAD) bit per frame (up to 3), followed by a single flag + indicating the presence of LBRR frames. For a stereo packet, these + flags correspond to the mid channel, and a second set of flags is + included for the side channel. + + Because these are the first symbols decoded by the range coder, they + can be extracted directly from the upper bits of the first byte of + compressed data. Thus, a receiver can determine if an Opus frame + contains any active SILK frames without the overhead of using the + range decoder. + +4.2.3. LBRR Flags + + For Opus frames longer than 20 ms, a set of per-frame LBRR flags is + decoded for each channel that has its LBRR flag set. For 40 ms Opus + frames the 2-frame LBRR flag PDF from Table 3 is used, and for 60 ms + Opus frames the 3-frame LBRR flag PDF is used. For each channel, the + resulting 2- or 3-bit integer contains the corresponding LBRR flag + for each frame, packed in order from the LSb to the MSb. + + +------------+-------------------------------------+ + | Frame Size | PDF | + +------------+-------------------------------------+ + | 40 ms | {0, 53, 53, 150}/256 | + | | | + | 60 ms | {0, 41, 20, 29, 41, 15, 28, 82}/256 | + +------------+-------------------------------------+ + + Table 3: LBRR Flag PDFs + + LBRR frames do not include their own separate VAD flags. An LBRR + frame is only meant to be transmitted for active speech, thus all + LBRR frames are treated as active. + +4.2.4. SILK Frame Contents + + Each SILK frame includes a set of side information that encodes the + frame type, quantization type and gains, short-term prediction filter + coefficients, LSF interpolation weight, long-term prediction filter + lags and gains, and a linear congruential generator (LCG) seed. The + quantized excitation signal follows these at the end of the frame. + + + + + + +Valin, et al. Expires February 17, 2012 [Page 28] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.4.1. Frame Type + + Each SILK frame begins with a single "frame type" symbol that jointly + codes the signal type and quantization offset type of the + corresponding frame. If the current frame is a regular SILK frame + whose VAD bit was not set (an "inactive" frame), then the frame type + symbol takes on the value either 0 or 1 and is decoded using the + first PDF in Table 4. If the frame is an LBRR frame or a regular + SILK frame whose VAD flag was set (an "active" frame), then the + symbol ranges from 2 to 5, inclusive, and is decoded using the second + PDF in Table 4. Table 5 translates between the value of the frame + type symbol and the corresponding signal type and quantization offset + type. + + +----------+-----------------------------+ + | VAD Flag | PDF | + +----------+-----------------------------+ + | Inactive | {26, 230, 0, 0, 0, 0}/256 | + | | | + | Active | {0, 0, 24, 74, 148, 10}/256 | + +----------+-----------------------------+ + + Table 4: Frame Type PDFs + + +------------+-------------+--------------------------+ + | Frame Type | Signal Type | Quantization Offset Type | + +------------+-------------+--------------------------+ + | 0 | Inactive | 0 | + | | | | + | 1 | Inactive | 1 | + | | | | + | 2 | Unvoiced | 0 | + | | | | + | 3 | Unvoiced | 1 | + | | | | + | 4 | Voiced | 0 | + | | | | + | 5 | Voiced | 1 | + +------------+-------------+--------------------------+ + + Table 5: Signal Type and Quantization Offset Type from Frame Type + +4.2.4.2. Sub-Frame Gains + + A separate quantization gain is coded for each 5 ms subframe. These + gains control the step size between quantization levels of the + excitation signal and, therefore, the quality of the reconstruction. + They are independent of the pitch gains coded for voiced frames. The + + + +Valin, et al. Expires February 17, 2012 [Page 29] + +Internet-Draft Interactive Audio Codec August 2011 + + + quantization gains are themselves uniformly quantized to 6 bits on a + log scale, giving them a resolution of approximately 1.369 dB and a + range of approximately 1.94 dB to 88.21 dB. + + For the first LBRR frame, an LBRR frame where the previous LBRR frame + was not coded, or the first regular SILK frame in an Opus frame, the + first subframe uses an independent coding method. The 3 most + significant bits of the quantization gain are decoded using a PDF + selected from Table 6 based on the decoded signal type. + + +-------------+------------------------------------+ + | Signal Type | PDF | + +-------------+------------------------------------+ + | Inactive | {32, 112, 68, 29, 12, 1, 1, 1}/256 | + | | | + | Unvoiced | {2, 17, 45, 60, 62, 47, 19, 4}/256 | + | | | + | Voiced | {1, 3, 26, 71, 94, 50, 9, 2}/256 | + +-------------+------------------------------------+ + + Table 6: PDFs for Independent Quantization Gain MSb Coding + + The 3 least significant bits are decoded using a uniform PDF: + + +--------------------------------------+ + | PDF | + +--------------------------------------+ + | {32, 32, 32, 32, 32, 32, 32, 32}/256 | + +--------------------------------------+ + + Table 7: PDF for Independent Quantization Gain LSb Coding + + For all other subframes (including the first subframe of frames not + listed as using independent coding above), the quantization gain is + coded relative to the gain from the previous subframe. The PDF in + Table 8 yields a delta gain index between 0 and 40, inclusive. + + +-------------------------------------------------------------------+ + | PDF | + +-------------------------------------------------------------------+ + | {6, 5, 11, 31, 132, 21, 8, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, | + | 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | + | 1}/256 | + +-------------------------------------------------------------------+ + + Table 8: PDF for Delta Quantization Gain Coding + + The following formula translates this index into a quantization gain + + + +Valin, et al. Expires February 17, 2012 [Page 30] + +Internet-Draft Interactive Audio Codec August 2011 + + + for the current subframe using the gain from the previous subframe: + + log_gain = min(max(2*gain_index - 16, + previous_log_gain + gain_index - 4), 63) + + silk_gains_dequant() (silk_gain_quant.c) dequantizes the gain for the + k'th subframe and converts it into a linear Q16 scale factor via + + gain_Q16[k] = silk_log2lin((0x1D1C71*log_gain>>16) + 2090) + + The function silk_log2lin() (silk_log2lin.c) computes an + approximation of of 2**(inLog_Q7/128.0), where inLog_Q7 is its Q7 + input. Let i = inLog_Q7>>7 be the integer part of inLogQ7 and f = + inLog_Q7&127 be the fractional part. Then, if i < 16, then + + (1<>16)+f)>>7)*(1<>16)+f)*((1<>7) . + +4.2.4.3. Normalized Line Spectral Frequencies + + Normalized Line Spectral Frequencies (LSFs) follow the quantization + gains in the bitstream, and represent the Linear Prediction + Coefficients (LPCs) for the current SILK frame. Once decoded, they + form an increasing list of Q15 values between 0 and 1. These + represent the interleaved zeros on the unit circle between 0 and pi + (hence "normalized") in the standard decomposition of the LPC filter + into a symmetric part and an anti-symmetric part (P and Q in + Section 4.2.4.3.3). Because of non-linear effects in the decoding + process, an implementation SHOULD match the fixed-point arithmetic + described in this section exactly. An encoder SHOULD also use the + same process. + + The normalized LSFs are coded using a two-stage vector quantizer + (VQ). NB and MB frames use an order-10 predictor, while WB frames + use an order-16 predictor, and thus have different sets of tables. + The first VQ stage uses a 32-element codebook, coded with one of the + PDFs in Table 9, depending on the audio bandwidth and the signal type + of the current SILK frame. This yields a single index, I1, for the + entire frame. This indexes an element in a coarse codebook, selects + the PDFs for the second stage of the VQ, and selects the prediction + weights used to remove intra-frame redundancy from the second stage. + The actual codebook elements are listed in Table 18 and Table 19, but + they are not needed until the last stages of reconstructing the LSF + coefficients. + + + + +Valin, et al. Expires February 17, 2012 [Page 31] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-----------+----------+--------------------------------------------+ + | Audio | Signal | PDF | + | Bandwidth | Type | | + +-----------+----------+--------------------------------------------+ + | NB or MB | Inactive | {44, 34, 30, 19, 21, 12, 11, 3, 3, 2, 16, | + | | or | 2, 2, 1, 5, 2, 1, 3, 3, 1, 1, 2, 2, 2, 3, | + | | unvoiced | 1, 9, 9, 2, 7, 2, 1}/256 | + | | | | + | NB or MB | Voiced | {1, 10, 1, 8, 3, 8, 8, 14, 13, 14, 1, 14, | + | | | 12, 13, 11, 11, 12, 11, 10, 10, 11, 8, 9, | + | | | 8, 7, 8, 1, 1, 6, 1, 6, 5}/256 | + | | | | + | WB | Inactive | {31, 21, 3, 17, 1, 8, 17, 4, 1, 18, 16, 4, | + | | or | 2, 3, 1, 10, 1, 3, 16, 11, 16, 2, 2, 3, 2, | + | | unvoiced | 11, 1, 4, 9, 8, 7, 3}/256 | + | | | | + | WB | Voiced | {1, 4, 16, 5, 18, 11, 5, 14, 15, 1, 3, 12, | + | | | 13, 14, 14, 6, 14, 12, 2, 6, 1, 12, 12, | + | | | 11, 10, 3, 10, 5, 1, 1, 1, 3}/256 | + +-----------+----------+--------------------------------------------+ + + Table 9: PDFs for Normalized LSF Index Stage-1 Decoding + + A total of 16 PDFs are available for the LSF residual in the second + stage: the 8 (a...h) for NB and MB frames given in Table 10, and the + 8 (i...p) for WB frames given in Table 11. Which PDF is used for + which coefficient is driven by the index, I1, decoded in the first + stage. Table 12 lists the letter of the corresponding PDF for each + normalized LSF coefficient for NB and MB, and Table 13 lists the same + information for WB. + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 32] + +Internet-Draft Interactive Audio Codec August 2011 + + + +----------+--------------------------------------+ + | Codebook | PDF | + +----------+--------------------------------------+ + | a | {1, 1, 1, 15, 224, 11, 1, 1, 1}/256 | + | | | + | b | {1, 1, 2, 34, 183, 32, 1, 1, 1}/256 | + | | | + | c | {1, 1, 4, 42, 149, 55, 2, 1, 1}/256 | + | | | + | d | {1, 1, 8, 52, 123, 61, 8, 1, 1}/256 | + | | | + | e | {1, 3, 16, 53, 101, 74, 6, 1, 1}/256 | + | | | + | f | {1, 3, 17, 55, 90, 73, 15, 1, 1}/256 | + | | | + | g | {1, 7, 24, 53, 74, 67, 26, 3, 1}/256 | + | | | + | h | {1, 1, 18, 63, 78, 58, 30, 6, 1}/256 | + +----------+--------------------------------------+ + + Table 10: PDFs for NB/MB Normalized LSF Index Stage-2 Decoding + + +----------+---------------------------------------+ + | Codebook | PDF | + +----------+---------------------------------------+ + | i | {1, 1, 1, 9, 232, 9, 1, 1, 1}/256 | + | | | + | j | {1, 1, 2, 28, 186, 35, 1, 1, 1}/256 | + | | | + | k | {1, 1, 3, 42, 152, 53, 2, 1, 1}/256 | + | | | + | l | {1, 1, 10, 49, 126, 65, 2, 1, 1}/256 | + | | | + | m | {1, 4, 19, 48, 100, 77, 5, 1, 1}/256 | + | | | + | n | {1, 1, 14, 54, 100, 72, 12, 1, 1}/256 | + | | | + | o | {1, 1, 15, 61, 87, 61, 25, 4, 1}/256 | + | | | + | p | {1, 7, 21, 50, 77, 81, 17, 1, 1}/256 | + +----------+---------------------------------------+ + + Table 11: PDFs for WB Normalized LSF Index Stage-2 Decoding + + +----+---------------------+ + | I1 | Coefficient | + +----+---------------------+ + | | 0 1 2 3 4 5 6 7 8 9 | + + + +Valin, et al. Expires February 17, 2012 [Page 33] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 0 | a a a a a a a a a a | + | | | + | 1 | b d b c c b c b b b | + | | | + | 2 | c b b b b b b b b b | + | | | + | 3 | b c c c c b c b b b | + | | | + | 4 | c d d d d c c c c c | + | | | + | 5 | a f d d c c c c b b | + | | | + | g | a c c c c c c c c b | + | | | + | 7 | c d g e e e f e f f | + | | | + | 8 | c e f f e f e g e e | + | | | + | 9 | c e e h e f e f f e | + | | | + | 10 | e d d d c d c c c c | + | | | + | 11 | b f f g e f e f f f | + | | | + | 12 | c h e g f f f f f f | + | | | + | 13 | c h f f f f f g f e | + | | | + | 14 | d d f e e f e f e e | + | | | + | 15 | c d d f f e e e e e | + | | | + | 16 | c e e g e f e f f f | + | | | + | 17 | c f e g f f f e f e | + | | | + | 18 | c h e f e f e f f f | + | | | + | 19 | c f e g h g f g f e | + | | | + | 20 | d g h e g f f g e f | + | | | + | 21 | c h g e e e f e f f | + | | | + | 22 | e f f e g g f g f e | + | | | + | 23 | c f f g f g e g e e | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 34] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 24 | e f f f d h e f f e | + | | | + | 25 | c d e f f g e f f e | + | | | + | 26 | c d c d d e c d d d | + | | | + | 27 | b b c c c c c d c c | + | | | + | 28 | e f f g g g f g e f | + | | | + | 29 | d f f e e e e d d c | + | | | + | 30 | c f d h f f e e f e | + | | | + | 31 | e e f e f g f g f e | + +----+---------------------+ + + Table 12: Codebook Selection for NB/MB Normalized LSF Index Stage 2 + Decoding + + +----+------------------------------------------------+ + | I1 | Coefficient | + +----+------------------------------------------------+ + | | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | + | | | + | 0 | i i i i i i i i i i i i i i i i | + | | | + | 1 | k l l l l l k k k k k j j j i l | + | | | + | 2 | k n n l p m m n k n m n n m l l | + | | | + | 3 | i k j k k j j j j j i i i i i j | + | | | + | 4 | i o n m o m p n m m m n n m m l | + | | | + | 5 | i l n n m l l n l l l l l l k m | + | | | + | 6 | i i i i i i i i i i i i i i i i | + | | | + | 7 | i k o l p k n l m n n m l l k l | + | | | + | 8 | i o k o o m n m o n m m n l l l | + | | | + | 9 | k j i i i i i i i i i i i i i i | + | | | + | j0 | i j i i i i i i i i i i i i i j | + | | | + | 11 | k k l m n l l l l l l l k k j l | + + + +Valin, et al. Expires February 17, 2012 [Page 35] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 12 | k k l l m l l l l l l l l k j l | + | | | + | 13 | l m m m o m m n l n m m n m l m | + | | | + | 14 | i o m n m p n k o n p m m l n l | + | | | + | 15 | i j i j j j j j j j i i i i j i | + | | | + | 16 | j o n p n m n l m n m m m l l m | + | | | + | 17 | j l l m m l l n k l l n n n l m | + | | | + | 18 | k l l k k k l k j k j k j j j m | + | | | + | 19 | i k l n l l k k k j j i i i i i | + | | | + | 20 | l m l n l l k k j j j j j k k m | + | | | + | 21 | k o l p p m n m n l n l l k l l | + | | | + | 22 | k l n o o l n l m m l l l l k m | + | | | + | 23 | j l l m m m m l n n n l j j j j | + | | | + | 24 | k n l o o m p m m n l m m l l l | + | | | + | 25 | i o j j i i i i i i i i i i i i | + | | | + | 26 | i o o l n k n n l m m p p m m m | + | | | + | 27 | l l p l n m l l l k k l l l k l | + | | | + | 28 | i i j i i i k j k j j k k k j j | + | | | + | 29 | i l k n l l k l k j i i j i i j | + | | | + | 30 | l n n m p n l l k l k k j i j i | + | | | + | 31 | k l n l m l l l k j k o m i i i | + +----+------------------------------------------------+ + + Table 13: Codebook Selection for WB Normalized LSF Index Stage 2 + Decoding + + Decoding the second stage residual proceeds as follows. For each + coefficient, the decoder reads a symbol using the PDF corresponding + to I1 from either Table 12 or Table 13, and subtracts 4 from the + result to given an index in the range -4 to 4, inclusive. If the + + + +Valin, et al. Expires February 17, 2012 [Page 36] + +Internet-Draft Interactive Audio Codec August 2011 + + + index is either -4 or 4, it reads a second symbol using the PDF in + Table 14, and adds the value of this second symbol to the index, + using the same sign. This gives the index, I2[k], a total range of + -10 to 10, inclusive. + + +-------------------------------+ + | PDF | + +-------------------------------+ + | {156, 60, 24, 9, 4, 2, 1}/256 | + +-------------------------------+ + + Table 14: PDF for Normalized LSF Index Extension Decoding + + The decoded indices from both stages are translated back into + normalized LSF coefficients in silk_NLSF_decode() + (silk_NLSF_decode.c). The stage-2 indices represent residuals after + both the first stage of the VQ and a separate backwards-prediction + step. The backwards prediction process in the encoder subtracts a + prediction from each residual formed by a multiple of the coefficient + that follows it. The decoder must undo this process. Table 15 + contains lists of prediction weights for each coefficient. There are + two lists for NB and MB, and another two lists for WB, giving two + possible prediction weights for each coefficient. + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 37] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------------+-----+-----+-----+-----+ + | Coefficient | A | B | C | D | + +-------------+-----+-----+-----+-----+ + | 0 | 179 | 116 | 175 | 68 | + | | | | | | + | 1 | 138 | 67 | 148 | 62 | + | | | | | | + | 2 | 140 | 82 | 160 | 66 | + | | | | | | + | 3 | 148 | 59 | 176 | 60 | + | | | | | | + | 4 | 151 | 92 | 178 | 72 | + | | | | | | + | 5 | 149 | 72 | 173 | 117 | + | | | | | | + | 6 | 153 | 100 | 174 | 85 | + | | | | | | + | 7 | 151 | 89 | 164 | 90 | + | | | | | | + | 8 | 163 | 92 | 177 | 118 | + | | | | | | + | 9 | | | 174 | 136 | + | | | | | | + | 10 | | | 196 | 151 | + | | | | | | + | 11 | | | 182 | 142 | + | | | | | | + | 12 | | | 198 | 160 | + | | | | | | + | 13 | | | 192 | 142 | + | | | | | | + | 14 | | | 182 | 155 | + +-------------+-----+-----+-----+-----+ + + Table 15: Prediction Weights for Normalized LSF Decoding + + The prediction is undone using the procedure implemented in + silk_NLSF_residual_dequant() (silk_NLSF_decode.c), which is as + follows. Each coefficient selects its prediction weight from one of + the two lists based on the stage-1 index, I1. Table 16 gives the + selections for each coefficient for NB and MB, and Table 17 gives the + selections for WB. Let d_LPC be the order of the codebook, i.e., 10 + for NB and MB, and 16 for WB, and let pred_Q8[k] be the weight for + the k'th coefficient selected by this process for 0 <= k < d_LPC-1. + Then, the stage-2 residual for each coefficient is computed via + + res_Q10[k] = (k+1 < d_LPC ? (res_Q10[k+1]*pred_Q8[k])>>8 : 0) + + ((((I2[k]<<10) + sign(I2[k])*102)*qstep)>>16) , + + + +Valin, et al. Expires February 17, 2012 [Page 38] + +Internet-Draft Interactive Audio Codec August 2011 + + + where qstep is the Q16 quantization step size, which is 11796 for NB + and MB and 9830 for WB (representing step sizes of approximately 0.18 + and 0.15, respectively). + + +----+-------------------+ + | I1 | Coefficient | + +----+-------------------+ + | | 0 1 2 3 4 5 6 7 8 | + | | | + | 0 | A B A A A A A A A | + | | | + | 1 | B A A A A A A A A | + | | | + | 2 | A A A A A A A A A | + | | | + | 3 | B B B A A A A B A | + | | | + | 4 | A B A A A A A A A | + | | | + | 5 | A B A A A A A A A | + | | | + | 6 | B A B B A A A B A | + | | | + | 7 | A B B A A B B A A | + | | | + | 8 | A A B B A B A B B | + | | | + | 9 | A A B B A A B B B | + | | | + | 10 | A A A A A A A A A | + | | | + | 11 | A B A B B B B B A | + | | | + | 12 | A B A B B B B B A | + | | | + | 13 | A B B B B B B B A | + | | | + | 14 | B A B B A B B B B | + | | | + | 15 | A B B B B B A B A | + | | | + | 16 | A A B B A B A B A | + | | | + | 17 | A A B B B A B B B | + | | | + | 18 | A B B A A B B B A | + | | | + | 19 | A A A B B B A B A | + + + +Valin, et al. Expires February 17, 2012 [Page 39] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 20 | A B B A A B A B A | + | | | + | 21 | A B B A A A B B A | + | | | + | 22 | A A A A A B B B B | + | | | + | 23 | A A B B A A A B B | + | | | + | 24 | A A A B A B B B B | + | | | + | 25 | A B B B B B B B A | + | | | + | 26 | A A A A A A A A A | + | | | + | 27 | A A A A A A A A A | + | | | + | 28 | A A B A B B A B A | + | | | + | 29 | A A A B A A A A A | + | | | + | 30 | A A A B B A B A B | + | | | + | 31 | B A B B A B B B B | + +----+-------------------+ + + Table 16: Prediction Weight Selection for NB/MB Normalized LSF + Decoding + + +----+---------------------------------------------+ + | I1 | Coefficient | + +----+---------------------------------------------+ + | | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 | + | | | + | 0 | C C C C C C C C C C C C C C D | + | | | + | 1 | C C C C C C C C C C C C C C C | + | | | + | 2 | C C D C C D D D C D D D D C C | + | | | + | 3 | C C C C C C C C C C C C D C C | + | | | + | 4 | C D D C D C D D C D D D D D C | + | | | + | 5 | C D C C C C C C C C C C C C C | + | | | + | 6 | D C C C C C C C C C C D C D C | + | | | + | 7 | C D D C C C D C D D D C D C D | + + + +Valin, et al. Expires February 17, 2012 [Page 40] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 8 | C D C D D C D C D C D D D D D | + | | | + | 9 | C C C C C C C C C C C C C C D | + | | | + | 10 | C D C C C C C C C C C C C C C | + | | | + | 11 | C C D C D D D D D D D C D C C | + | | | + | 12 | C C D C C D C D C D C C D C C | + | | | + | 13 | C C C C D D C D C D D D D C C | + | | | + | 14 | C D C C C D D C D D D C D D D | + | | | + | 15 | C C D D C C C C C C C C D D C | + | | | + | 16 | C D D C D C D D D D D C D C C | + | | | + | 17 | C C D C C C C D C C D D D C C | + | | | + | 18 | C C C C C C C C C C C C C C D | + | | | + | 19 | C C C C C C C C C C C C D C C | + | | | + | 20 | C C C C C C C C C C C C C C C | + | | | + | 21 | C D C D C D D C D C D C D D C | + | | | + | 22 | C C D D D D C D D C C D D C C | + | | | + | 23 | C D D C D C D C D C C C C D C | + | | | + | 24 | C C C D D C D C D D D D D D D | + | | | + | 25 | C C C C C C C C C C C C C C D | + | | | + | 26 | C D D C C C D D C C D D D D D | + | | | + | 27 | C C C C C D C D D D D C D D D | + | | | + | 28 | C C C C C C C C C C C C C C D | + | | | + | 29 | C C C C C C C C C C C C C C D | + | | | + | 30 | D C C C C C C C C C C D C C C | + | | | + | 31 | C C D C C D D D C C D C C D C | + +----+---------------------------------------------+ + + + +Valin, et al. Expires February 17, 2012 [Page 41] + +Internet-Draft Interactive Audio Codec August 2011 + + + Table 17: Prediction Weight Selection for WB Normalized LSF Decoding + + The spectral distortion introduced by the quantization of each LSF + coefficient varies, so the stage-2 residual is weighted accordingly, + using the low-complexity weighting function proposed in + [laroia-icassp]. The weights are derived directly from the stage-1 + codebook vector. Let cb1_Q8[k] be the k'th entry of the stage-1 + codebook vector from Table 18 or Table 19. Then for 0 <= k < d_LPC + the following expression computes the square of the weight as a Q18 + value: + + + w2_Q18[k] = (1024/(cb1_Q8[k] - cb1_Q8[k-1]) + + 1024/(cb1_Q8[k+1] - cb1_Q8[k])) << 16 , + + + where cb1_Q8[-1] = 0 and cb1_Q8[d_LPC] = 256, and the division is + exact integer division. This is reduced to an unsquared, Q9 value + using the following square-root approximation: + + i = ilog(w2_Q18[k]) + f = (w2_Q18[k]>>(i-8)) & 127 + y = ((i&1) ? 32768 : 46214) >> ((32-i)>>1) + w_Q9[k] = y + ((213*f*y)>>16) + + The cb1_Q8[] vector completely determines these weights, and they may + be tabulated and stored as 13-bit unsigned values (with a range of + 1819 to 5227) to avoid computing them when decoding. The reference + implementation computes them on the fly in + silk_NLSF_VQ_weights_laroia() (silk_NLSF_VQ_weights_laroia.c) and its + caller, to reduce the amount of ROM required. + + +----+----------------------------------------+ + | I1 | Codebook | + +----+----------------------------------------+ + | | 0 1 2 3 4 5 6 7 8 9 | + | | | + | 0 | 12 35 60 83 108 132 157 180 206 228 | + | | | + | 1 | 15 32 55 77 101 125 151 175 201 225 | + | | | + | 2 | 19 42 66 89 114 137 162 184 209 230 | + | | | + | 3 | 12 25 50 72 97 120 147 172 200 223 | + | | | + | 4 | 26 44 69 90 114 135 159 180 205 225 | + | | | + | 5 | 13 22 53 80 106 130 156 180 205 228 | + + + +Valin, et al. Expires February 17, 2012 [Page 42] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 6 | 15 25 44 64 90 115 142 168 196 222 | + | | | + | 7 | 19 24 62 82 100 120 145 168 190 214 | + | | | + | 8 | 22 31 50 79 103 120 151 170 203 227 | + | | | + | 9 | 21 29 45 65 106 124 150 171 196 224 | + | | | + | 10 | 30 49 75 97 121 142 165 186 209 229 | + | | | + | 11 | 19 25 52 70 93 116 143 166 192 219 | + | | | + | 12 | 26 34 62 75 97 118 145 167 194 217 | + | | | + | 13 | 25 33 56 70 91 113 143 165 196 223 | + | | | + | 14 | 21 34 51 72 97 117 145 171 196 222 | + | | | + | 15 | 20 29 50 67 90 117 144 168 197 221 | + | | | + | 16 | 22 31 48 66 95 117 146 168 196 222 | + | | | + | 17 | 24 33 51 77 116 134 158 180 200 224 | + | | | + | 18 | 21 28 70 87 106 124 149 170 194 217 | + | | | + | 19 | 26 33 53 64 83 117 152 173 204 225 | + | | | + | 20 | 27 34 65 95 108 129 155 174 210 225 | + | | | + | 21 | 20 26 72 99 113 131 154 176 200 219 | + | | | + | 22 | 34 43 61 78 93 114 155 177 205 229 | + | | | + | 23 | 23 29 54 97 124 138 163 179 209 229 | + | | | + | 24 | 30 38 56 89 118 129 158 178 200 231 | + | | | + | 25 | 21 29 49 63 85 111 142 163 193 222 | + | | | + | 26 | 27 48 77 103 133 158 179 196 215 232 | + | | | + | 27 | 29 47 74 99 124 151 176 198 220 237 | + | | | + | 28 | 33 42 61 76 93 121 155 174 207 225 | + | | | + | 29 | 29 53 87 112 136 154 170 188 208 227 | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 43] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 30 | 24 30 52 84 131 150 166 186 203 229 | + | | | + | 31 | 37 48 64 84 104 118 156 177 201 230 | + +----+----------------------------------------+ + + Table 18: Codebook Vectors for NB/MB Normalized LSF Stage 1 Decoding + + +----+------------------------------------------------------------+ + | I1 | Codebook | + +----+------------------------------------------------------------+ + | | 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | + | | | + | 0 | 7 23 38 54 69 85 100 116 131 147 162 178 193 208 223 239 | + | | | + | 1 | 13 25 41 55 69 83 98 112 127 142 157 171 187 203 220 236 | + | | | + | 2 | 15 21 34 51 61 78 92 106 126 136 152 167 185 205 225 240 | + | | | + | 3 | 10 21 36 50 63 79 95 110 126 141 157 173 189 205 221 237 | + | | | + | 4 | 17 20 37 51 59 78 89 107 123 134 150 164 184 205 224 240 | + | | | + | 5 | 10 15 32 51 67 81 96 112 129 142 158 173 189 204 220 236 | + | | | + | 6 | 8 21 37 51 65 79 98 113 126 138 155 168 179 192 209 218 | + | | | + | 7 | 12 15 34 55 63 78 87 108 118 131 148 167 185 203 219 236 | + | | | + | 8 | 16 19 32 36 56 79 91 108 118 136 154 171 186 204 220 237 | + | | | + | 9 | 11 28 43 58 74 89 105 120 135 150 165 180 196 211 226 241 | + | | | + | 10 | 6 16 33 46 60 75 92 107 123 137 156 169 185 199 214 225 | + | | | + | 11 | 11 19 30 44 57 74 89 105 121 135 152 169 186 202 218 234 | + | | | + | 12 | 12 19 29 46 57 71 88 100 120 132 148 165 182 199 216 233 | + | | | + | 13 | 17 23 35 46 56 77 92 106 123 134 152 167 185 204 222 237 | + | | | + | 14 | 14 17 45 53 63 75 89 107 115 132 151 171 188 206 221 240 | + | | | + | 15 | 9 16 29 40 56 71 88 103 119 137 154 171 189 205 222 237 | + | | | + | 16 | 16 19 36 48 57 76 87 105 118 132 150 167 185 202 218 236 | + | | | + | 17 | 12 17 29 54 71 81 94 104 126 136 149 164 182 201 221 237 | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 44] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 18 | 15 28 47 62 79 97 115 129 142 155 168 180 194 208 223 238 | + | | | + | 19 | 8 14 30 45 62 78 94 111 127 143 159 175 192 207 223 239 | + | | | + | 20 | 17 30 49 62 79 92 107 119 132 145 160 174 190 204 220 235 | + | | | + | 21 | 14 19 36 45 61 76 91 108 121 138 154 172 189 205 222 238 | + | | | + | 22 | 12 18 31 45 60 76 91 107 123 138 154 171 187 204 221 236 | + | | | + | 23 | 13 17 31 43 53 70 83 103 114 131 149 167 185 203 220 237 | + | | | + | 24 | 17 22 35 42 58 78 93 110 125 139 155 170 188 206 224 240 | + | | | + | 25 | 8 15 34 50 67 83 99 115 131 146 162 178 193 209 224 239 | + | | | + | 26 | 13 16 41 66 73 86 95 111 128 137 150 163 183 206 225 241 | + | | | + | 27 | 17 25 37 52 63 75 92 102 119 132 144 160 175 191 212 231 | + | | | + | 28 | 19 31 49 65 83 100 117 133 147 161 174 187 200 213 227 242 | + | | | + | 29 | 18 31 52 68 88 103 117 126 138 149 163 177 192 207 223 239 | + | | | + | 30 | 16 29 47 61 76 90 106 119 133 147 161 176 193 209 224 240 | + | | | + | 31 | 15 21 35 50 61 73 86 97 110 119 129 141 175 198 218 237 | + +----+------------------------------------------------------------+ + + Table 19: Codebook Vectors for WB Normalized LSF Stage 1 Decoding + + Given the stage-1 codebook entry cb1_Q8[], the stage-2 residual + res_Q10[], and their corresponding weights, w_Q9[], the reconstructed + normalized LSF coefficients are + + NLSF_Q15[k] = (cb1_Q8[k]<<7) + (res_Q10[k]<<14)/w_Q9[k] , + + where the division is exact integer division. However, nothing thus + far in the reconstruction process, nor in the quantization process in + the encoder, guarantees that the coefficients are monotonically + increasing and separated well enough to ensure a stable filter. When + using the reference encoder, roughly 2% of frames violate this + constraint. The next section describes a stabilization procedure + used to make these guarantees. + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 45] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.4.3.1. Normalized LSF Stabilization + + The normalized LSF stabilization procedure is implemented in + silk_NLSF_stabilize() (silk_NLSF_stabilize.c). This process ensures + that consecutive values of the normalized LSF coefficients, + NLSF_Q15[], are spaced some minimum distance apart (predetermined to + be the 0.01 percentile of a large training set). Table 20 gives the + minimum spacings for NB and MB and those for WB, where row k is the + minimum allowed value of NLSF_Q[k]-NLSF_Q[k-1]. For the purposes of + computing this spacing for the first and last coefficient, + NLSF_Q15[-1] is taken to be 0, and NLSF_Q15[d_LPC] is taken to be + 32768. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 46] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------------+-----------+-----+ + | Coefficient | NB and MB | WB | + +-------------+-----------+-----+ + | 0 | 250 | 100 | + | | | | + | 1 | 3 | 3 | + | | | | + | 2 | 6 | 40 | + | | | | + | 3 | 3 | 3 | + | | | | + | 4 | 3 | 3 | + | | | | + | 5 | 3 | 3 | + | | | | + | 6 | 4 | 5 | + | | | | + | 7 | 3 | 14 | + | | | | + | 8 | 3 | 14 | + | | | | + | 9 | 3 | 10 | + | | | | + | 10 | 461 | 11 | + | | | | + | 11 | | 3 | + | | | | + | 12 | | 8 | + | | | | + | 13 | | 9 | + | | | | + | 14 | | 7 | + | | | | + | 15 | | 3 | + | | | | + | 16 | | 347 | + +-------------+-----------+-----+ + + Table 20: Minimum Spacing for Normalized LSF Coefficients + + The procedure starts off by trying to make small adjustments which + attempt to minimize the amount of distortion introduced. After 20 + such adjustments, it falls back to a more direct method which + guarantees the constraints are enforced but may require large + adjustments. + + Let NDeltaMin_Q15[k] be the minimum required spacing for the current + audio bandwidth from Table 20. First, the procedure finds the index + + + +Valin, et al. Expires February 17, 2012 [Page 47] + +Internet-Draft Interactive Audio Codec August 2011 + + + i where NLSF_Q15[i] - NLSF_Q15[i-1] - NDeltaMin_Q15[i] is the + smallest, breaking ties by using the lower value of i. If this value + is non-negative, then the stabilization stops; the coefficients + satisfy all the constraints. Otherwise, if i == 0, it sets + NLSF_Q15[0] to NDeltaMin_Q15[0], and if i == d_LPC, it sets + NLSF_Q15[d_LPC-1] to (32768 - NDeltaMin_Q15[d_LPC]). For all other + values of i, both NLSF_Q15[i-1] and NLSF_Q15[i] are updated as + follows: + + i-1 + __ + min_center_Q15 = (NDeltaMin[i]>>1) + \ NDeltaMin[k] + /_ + k=0 + d_LPC + __ + max_center_Q15 = 32768 - (NDeltaMin[i]>>1) - \ NDeltaMin[k] + /_ + k=i+1 + center_freq_Q15 = clamp(min_center_Q15[i], + (NLSF_Q15[i-1] + NLSF_Q15[i] + 1)>>1, + max_center_Q15[i]) + + NLSF_Q15[i-1] = center_freq_Q15 - (NDeltaMin_Q15[i]>>1) + + NLSF_Q15[i] = NLSF_Q15[i-1] + NDeltaMin_Q15[i] . + + Then the procedure repeats again, until it has executed 20 times, or + until it stops because the coefficients satisfy all the constraints. + + After the 20th repetition of the above, the following fallback + procedure executes once. First, the values of NLSF_Q15[k] for + 0 <= k < d_LPC are sorted in ascending order. Then for each value of + k from 0 to d_LPC-1, NLSF_Q15[k] is set to + + max(NLSF_Q15[k], NLSF_Q15[k-1] + NDeltaMin_Q15[k]) . + + Next, for each value of k from d_LPC-1 down to 0, NLSF_Q15[k] is set + to + + min(NLSF_Q15[k], NLSF_Q15[k+1] - NDeltaMin_Q15[k+1]) . + +4.2.4.3.2. Normalized LSF Interpolation + + For 20 ms SILK frames, the first half of the frame (i.e., the first + two sub-frames) may use normalized LSF coefficients that are + interpolated between the decoded LSFs for the previous frame and the + current frame. A Q2 interpolation factor follows the LSF coefficient + + + +Valin, et al. Expires February 17, 2012 [Page 48] + +Internet-Draft Interactive Audio Codec August 2011 + + + indices in the bitstream, which is decoded using the PDF in Table 21. + This happens in silk_decode_indices() (silk_decode_indices.c). For + the first frame after a decoder reset, when no prior LSF coefficients + are available, the decoder still decodes this factor, but ignores its + value and always uses 4 instead. For 10 ms SILK frames, this factor + is not stored at all. + + +---------------------------+ + | PDF | + +---------------------------+ + | {13, 22, 29, 11, 181}/256 | + +---------------------------+ + + Table 21: PDF for Normalized LSF Interpolation Index + + Let n2_Q15[k] be the normalized LSF coefficients decoded by the + procedure in Section 4.2.4.3, n0_Q15[k] be the LSF coefficients + decoded for the prior frame, and w_Q2 be the interpolation factor. + Then the normalized LSF coefficients used for the first half of a + 20 ms frame, n1_Q15[k], are + + n1_Q15[k] = n0_Q15[k] + (w_Q2*(n2_Q15[k] - n0_Q15[k]) >> 2) . + + This interpolation is performed in silk_decode_parameters() + (silk_decode_parameters.c). + +4.2.4.3.3. Converting Normalized LSF Coefficients to LPCs + + Any LPC filter A(z) can be split into a symmetric part P(z) and an + anti-symmetric part Q(z) such that + + d_LPC + __ -k 1 + A(z) = 1 - \ a[k] * z = - * (P(z) + Q(z)) + /_ 2 + k=1 + + with + + -d_LPC-1 -1 + P(z) = A(z) + z * A(z ) + + -d_LPC-1 -1 + Q(z) = A(z) - z * A(z ) . + + The even normalized LSF coefficients correspond to a pair of + conjugate roots of P(z), while the odd coefficients correspond to a + pair of conjugate roots of Q(z), all of which lie on the unit circle. + + + +Valin, et al. Expires February 17, 2012 [Page 49] + +Internet-Draft Interactive Audio Codec August 2011 + + + In addition, P(z) has a root at pi and Q(z) has a root at 0. Thus, + they may be reconstructed mathematically from a set of normalized LSF + coefficients, n[k], as + + d_LPC/2-1 + -1 ___ -1 -2 + P(z) = (1 + z ) * | | (1 - 2*cos(pi*n[2*k])*z + z ) + k=0 + + d_LPC/2-1 + -1 ___ -1 -2 + Q(z) = (1 - z ) * | | (1 - 2*cos(pi*n[2*k+1])*z + z ) + k=0 + + However, SILK performs this reconstruction using a fixed-point + approximation so that all decoders can reproduce it in a bit-exact + manner to avoid prediction drift. The function silk_NLSF2A() + (silk_NLSF2A.c) implements this procedure. + + To start, it approximates cos(pi*n[k]) using a table lookup with + linear interpolation. The encoder SHOULD use the inverse of this + piecewise linear approximation, rather than true the inverse of the + cosine function, when deriving the normalized LSF coefficients. + + The top 7 bits of each normalized LSF coefficient index a value in + the table, and the next 8 bits interpolate between it and the next + value. Let i = n[k]>>8 be the integer index and f = n[k]&255 be the + fractional part of a given coefficient. Then the approximated + cosine, c_Q17[k], is + + c_Q17[k] = (cos_Q13[i]*256 + (cos_Q13[i+1]-cos_Q13[i])*f + 8) >> 4 , + + where cos_Q13[i] is the corresponding entry of Table 22. + + +-----+-------+-------+-------+-------+ + | | 0 | 1 | 2 | 3 | + +-----+-------+-------+-------+-------+ + | 0 | 8192 | 8190 | 8182 | 8170 | + | | | | | | + | 4 | 8152 | 8130 | 8104 | 8072 | + | | | | | | + | 8 | 8034 | 7994 | 7946 | 7896 | + | | | | | | + | 12 | 7840 | 7778 | 7714 | 7644 | + | | | | | | + | 16 | 7568 | 7490 | 7406 | 7318 | + | | | | | | + | 20 | 7226 | 7128 | 7026 | 6922 | + + + +Valin, et al. Expires February 17, 2012 [Page 50] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 24 | 6812 | 6698 | 6580 | 6458 | + | | | | | | + | 28 | 6332 | 6204 | 6070 | 5934 | + | | | | | | + | 32 | 5792 | 5648 | 5502 | 5352 | + | | | | | | + | 36 | 5198 | 5040 | 4880 | 4718 | + | | | | | | + | 40 | 4552 | 4382 | 4212 | 4038 | + | | | | | | + | 44 | 3862 | 3684 | 3502 | 3320 | + | | | | | | + | 48 | 3136 | 2948 | 2760 | 2570 | + | | | | | | + | 52 | 2378 | 2186 | 1990 | 1794 | + | | | | | | + | 56 | 1598 | 1400 | 1202 | 1002 | + | | | | | | + | 60 | 802 | 602 | 402 | 202 | + | | | | | | + | 64 | 0 | -202 | -402 | -602 | + | | | | | | + | 68 | -802 | -1002 | -1202 | -1400 | + | | | | | | + | 72 | -1598 | -1794 | -1990 | -2186 | + | | | | | | + | 76 | -2378 | -2570 | -2760 | -2948 | + | | | | | | + | 80 | -3136 | -3320 | -3502 | -3684 | + | | | | | | + | 84 | -3862 | -4038 | -4212 | -4382 | + | | | | | | + | 88 | -4552 | -4718 | -4880 | -5040 | + | | | | | | + | 92 | -5198 | -5352 | -5502 | -5648 | + | | | | | | + | 96 | -5792 | -5934 | -6070 | -6204 | + | | | | | | + | 100 | -6332 | -6458 | -6580 | -6698 | + | | | | | | + | 104 | -6812 | -6922 | -7026 | -7128 | + | | | | | | + | 108 | -7226 | -7318 | -7406 | -7490 | + | | | | | | + | 112 | -7568 | -7644 | -7714 | -7778 | + | | | | | | + | 116 | -7840 | -7896 | -7946 | -7994 | + | | | | | | + + + +Valin, et al. Expires February 17, 2012 [Page 51] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 120 | -8034 | -8072 | -8104 | -8130 | + | | | | | | + | 124 | -8152 | -8170 | -8182 | -8190 | + | | | | | | + | 128 | -8192 | | | | + +-----+-------+-------+-------+-------+ + + Table 22: Q13 Cosine Table for LSF Conversion + + Given the list of cosine values, silk_NLSF2A_find_poly() + (silk_NLSF2A.c) computes the coefficients of P and Q, described here + via a simple recurrence. Let p_Q16[k][j] and q_Q16[k][j] be the + coefficients of the products of the first (k+1) root pairs for P and + Q, with j indexing the coefficient number. Only the first (k+2) + coefficients are needed, as the products are symmetric. Let + p_Q16[0][0] = q_Q16[0][0] = 1<<16, p_Q16[0][1] = -c_Q17[0], + q_Q16[0][1] = -c_Q17[1], and d2 = d_LPC/2. As boundary conditions, + assume p_Q16[k][j] = q_Q16[k][j] = 0 for all j < 0. Also, assume + p_Q16[k][k+2] = p_Q16[k][k] and q_Q16[k][k+2] = q_Q16[k][k] (because + of the symmetry). Then, for 0 >16) , + + q_Q16[k][j] = q_Q16[k-1][j] + q_Q16[k-1][j-2] + - ((c_Q17[2*k+1]*q_Q16[k-1][j-1] + 32768)>>16) . + + The use of Q17 values for the cosine terms in an otherwise Q16 + expression implicitly scales them by a factor of 2. The + multiplications in this recurrence may require up to 48 bits of + precision in the result to avoid overflow. In practice, each row of + the recurrence only depends on the previous row, so an implementation + does not need to store all of them. + + silk_NLSF2A() uses the values from the last row of this recurrence to + reconstruct a 32-bit version of the LPC filter (without the leading + 1.0 coefficient), a32_Q17[k], 0 <= k < d2: + + a32_Q17[k] = -(q_Q16[d2-1][k+1] - q_Q16[d2-1][k]) + - (p_Q16[d2-1][k+1] + p_Q16[d2-1][k])) , + + a32_Q17[d_LPC-k-1] = (q_Q16[d2-1][k+1] - q_Q16[d2-1][k]) + - (p_Q16[d2-1][k+1] + p_Q16[d2-1][k])) . + + The sum and difference of two terms from each of the p_Q16 and q_Q16 + coefficient lists reflect the (1 + z**-1) and (1 - z**-1) factors of + P and Q, respectively. The promotion of the expression from Q16 to + Q17 implicitly scales the result by 1/2. + + + +Valin, et al. Expires February 17, 2012 [Page 52] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.4.3.4. Limiting the Range of the LPC Coefficients + + The a32_Q17[] coefficients are too large to fit in a 16-bit value, + which significantly increases the cost of applying this filter in + fixed-point decoders. Reducing them to Q12 precision doesn't incur + any significant quality loss, but still does not guarantee they will + fit. silk_NLSF2A() applies up to 10 rounds of bandwidth expansion to + limit the dynamic range of these coefficients. Even floating-point + decoders SHOULD perform these steps, to avoid mismatch. + + For each round, the process first finds the index k such that + abs(a32_Q17[k]) is the largest, breaking ties by using the lower + value of k. Then, it computes the corresponding Q12 precision value, + maxabs_Q12, subject to an upper bound to avoid overflow in subsequent + computations: + + maxabs_Q12 = min((maxabs_Q17 + 16) >> 5, 163838) . + + If this is larger than 32767, the procedure derives the chirp factor, + sc_Q16[0], to use in the bandwidth expansion as + + (maxabs_Q12 - 32767) << 14 + sc_Q16[0] = 65470 - -------------------------- , + (maxabs_Q12 * (k+1)) >> 2 + + where the division here is exact integer division. This is an + approximation of the chirp factor needed to reduce the target + coefficient to 32767, though it is both less than 0.999 and, for + k > 0 when maxabs_Q12 is much greater than 32767, still slightly too + large. + + silk_bwexpander_32() (silk_bwexpander_32.c) performs the bandwidth + expansion (again, only when maxabs_Q12 is greater than 32767) using + the following recurrence: + + a32_Q17[k] = (a32_Q17[k]*sc_Q16[k]) >> 16 + + sc_Q16[k+1] = (sc_Q16[0]*sc_Q16[k] + 32768) >> 16 + + The first multiply may require up to 48 bits of precision in the + result to avoid overflow. The second multiply must be unsigned to + avoid overflow with only 32 bits of precision. The reference + implementation uses a slightly more complex formulation that avoids + the 32-bit overflow using signed multiplication, but is otherwise + equivalent. + + After 10 rounds of bandwidth expansion are performed, they are simply + saturated to 16 bits: + + + +Valin, et al. Expires February 17, 2012 [Page 53] + +Internet-Draft Interactive Audio Codec August 2011 + + + a32_Q17[k] = clamp(-32768, (a32_Q17[k]+16) >> 5, 32767) << 5 . + + Because this performs the actual saturation in the Q12 domain, but + converts the coefficients back to the Q17 domain for the purposes of + prediction gain limiting, this step must be performed after the 10th + round of bandwidth expansion, regardless of whether or not the Q12 + version of any of the coefficients still overflow a 16-bit integer. + This saturation is not performed if maxabs_Q12 drops to 32767 or less + prior to the 10th round. + +4.2.4.3.5. Limiting the Prediction Gain of the LPC Filter + + Even if the Q12 coefficients would fit, the resulting filter may + still have a significant gain (especially for voiced sounds), making + the filter unstable. silk_NLSF2A() applies up to 18 additional rounds + of bandwidth expansion to limit the prediction gain. Instead of + controlling the amount of bandwidth expansion using the prediction + gain itself (which may diverge to infinity for an unstable filter), + silk_NLSF2A() uses LPC_inverse_pred_gain_QA() + (silk_LPC_inv_pred_gain.c) to compute the reflection coefficients + associated with the filter. The filter is stable if and only if the + magnitude of these coefficients is sufficiently less than one. The + reflection coefficients, rc[k], can be computed using a simple + Levinson recurrence, initialized with the LPC coefficients a[d_LPC- + 1][n] = a[n], and then updated via + + rc[k] = -a[k][k] , + + a[k][n] - a[k][k-n-1]*rc[k] + a[k-1][n] = --------------------------- . + 2 + 1 - rc[k] + + However, LPC_inverse_pred_gain_QA() approximates this using fixed- + point arithmetic to guarantee reproducible results across platforms + and implementations. It is important to run on the real Q12 + coefficients that will be used during reconstruction, because small + changes in the coefficients can make a stable filter unstable, but + increasing the precision back to Q16 allows more accurate computation + of the reflection coefficients. Thus, let + + a32_Q16[d_LPC-1][n] = ((a32_Q17[n] + 16) >> 5) << 4 + + be the Q16 representation of the Q12 version of the LPC coefficients + that will eventually be used. Then for each k from d_LPC-1 down to + 0, if abs(a32_Q16[k][k]) > 65520, the filter is unstable and the + recurrence stops. Otherwise, the row k-1 of a32_Q16 is computed from + row k as + + + +Valin, et al. Expires February 17, 2012 [Page 54] + +Internet-Draft Interactive Audio Codec August 2011 + + + rc_Q31[k] = -a32_Q16[k][k] << 15 , + + div_Q30[k] = (1<<30) - 1 - (rc_Q31[k]*rc_Q31[k] >> 32) , + + b1[k] = ilog(div_Q30[k]) - 16 , + + (1<<29) - 1 + inv_Qb1[k] = ----------------------- , + div_Q30[k] >> (b1[k]+1) + + err_Q29[k] = (1<<29) + - ((div_Q30[k]<<(15-b1[k]))*inv_Qb1[k] >> 16) , + + mul_Q16[k] = ((inv_Qb1[k] << 16) + + (err_Q29[k]*inv_Qb1[k] >> 13)) >> b1[k] , + + b2[k] = ilog(mul_Q16[k]) - 15 , + + t_Q16[k-1][n] = a32_Q16[k][n] + - ((a32_Q16[k][k-n-1]*rc_Q31[k] >> 32) << 1) , + + a32_Q16[k-1][n] = ((t_Q16[k-1][n] * + (mul_Q16[k] << (16-b2[k]))) >> 32) << b2[k] . + + Here, rc_Q30[k] are the reflection coefficients. div_Q30[k] is the + denominator for each iteration, and mul_Q16[k] is its multiplicative + inverse. inv_Qb1[k], which ranges from 16384 to 32767, is a low- + precision version of that inverse (with b1[k] fractional bits, where + b1[k] ranges from 3 to 14). err_Q29[k] is the residual error, ranging + from -32392 to 32763, which is used to improve the accuracy. + t_Q16[k-1][n], 0 <= n < k, are the numerators for the next row of + coefficients in the recursion, and a32_Q16[k-1][n] is the final + version of that row. Every multiply in this procedure except the one + used to compute mul_Q16[k] requires more than 32 bits of precision, + but otherwise all intermediate results fit in 32 bits or less. In + practice, because each row only depends on the next one, an + implementation does not need to store them all. If + abs(a32_Q16[k][k]) <= 65520 for 0 <= k < d_LPC, then the filter is + considered stable. + + On round i, 1 <= i <= 18, if the filter passes this stability check, + then this procedure stops, and the final LPC coefficients to use for + reconstruction are + + a_Q12[k] = (a32_Q17[k] + 16) >> 5 . + + Otherwise, a round of bandwidth expansion is applied using the same + procedure as in Section 4.2.4.3.4, with + + + +Valin, et al. Expires February 17, 2012 [Page 55] + +Internet-Draft Interactive Audio Codec August 2011 + + + sc_Q16[0] = 65536 - i*(i+9) . + + If, after the 18th round, the filter still fails the stability check, + then a_Q12[k] is set to 0 for all k. + +4.2.4.4. Long-Term Prediction (LTP) Parameters + + After the normalized LSF indices and, for 20 ms frames, the LSF + interpolation index, voiced frames (see Section 4.2.4.1) include + additional Long-Term Prediction (LTP) parameters. There is one + primary lag index for each SILK frame, but this is refined to produce + a separate lag index per subframe using a vector quantizer. Each + subframe also gets its own prediction gain coefficient. + +4.2.4.4.1. Pitch Lags + + The primary lag index is coded either relative to the primary lag of + the prior frame or as an absolute index. Like the quantization + gains, the first LBRR frame, an LBRR frame where the previous LBRR + frame was not coded, or the first regular SILK frame in an Opus frame + all code the pitch lag as an absolute index. When the prior frame + was not voiced, this also forces absolute coding. + + With absolute coding, the primary pitch lag may range from 2 ms + (inclusive) up to 18 ms (exclusive), corresponding to pitches from + 500 Hz down to 55.6 Hz, respectively. It is comprised of a high part + and a low part, where the decoder reads the high part using the 32- + entry codebook in Table 23 and the low part using the codebook + corresponding to the current audio bandwidth from Table 24. The + final primary pitch lag is then + + lag = lag_high*lag_scale + lag_low + lag_min + + where lag_high is the high part, lag_low is the low part, and + lag_scale and lag_min are the values from the "Scale" and "Minimum + Lag" columns of Table 24, respectively. + + +-------------------------------------------------------------------+ + | PDF | + +-------------------------------------------------------------------+ + | {3, 3, 6, 11, 21, 30, 32, 19, 11, 10, 12, 13, 13, 12, 11, 9, 8, | + | 7, 6, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1}/256 | + +-------------------------------------------------------------------+ + + Table 23: PDF for High Part of Primary Pitch Lag + + + + + + +Valin, et al. Expires February 17, 2012 [Page 56] + +Internet-Draft Interactive Audio Codec August 2011 + + + +------------+------------------------+-------+----------+----------+ + | Audio | PDF | Scale | Minimum | Maximum | + | Bandwidth | | | Lag | Lag | + +------------+------------------------+-------+----------+----------+ + | NB | {64, 64, 64, 64}/256 | 4 | 16 | 144 | + | | | | | | + | MB | {43, 42, 43, 43, 42, | 6 | 24 | 216 | + | | 43}/256 | | | | + | | | | | | + | WB | {32, 32, 32, 32, 32, | 8 | 32 | 288 | + | | 32, 32, 32}/256 | | | | + +------------+------------------------+-------+----------+----------+ + + Table 24: PDF for Low Part of Primary Pitch Lag + + All frames that do not use absolute coding for the primary lag index + use relative coding instead. The decoder reads a single delta value + using the 21-entry PDF in Table 25. If the resulting value is zero, + it falls back to the absolute coding procedure from the prior + paragraph. Otherwise, the final primary pitch lag is then + + lag = lag_prev + (delta_lag_index - 9) + + where lag_prev is the primary pitch lag from the previous frame and + delta_lag_index is the value just decoded. This allows a per-frame + change in the pitch lag of -8 to +11 samples. The decoder does no + clamping at this point, so this value can fall outside the range of + 2 ms to 18 ms, and the decoder must use this unclamped value when + using relative coding in the next SILK frame (if any). However, + because an Opus frame can use relative coding for at most two + consecutive SILK frames, integer overflow should not be an issue. + + +-------------------------------------------------------------------+ + | PDF | + +-------------------------------------------------------------------+ + | {46, 2, 2, 3, 4, 6, 10, 15, 26, 38, 30, 22, 15, 10, 7, 6, 4, 4, | + | 2, 2, 2}/256 | + +-------------------------------------------------------------------+ + + Table 25: PDF for Pitch Lag Change + + After the primary pitch lag, a "pitch contour", stored as a single + entry from one of four small VQ codebooks, gives lag offsets for each + subframe in the current SILK frame. The codebook index is decoded + using one of the PDFs in Table 26 depending on the current frame size + and audio bandwidth. Table 27 through Table 30 give the + corresponding offsets to apply to the primary pitch lag for each + subframe given the decoded codebook index. + + + +Valin, et al. Expires February 17, 2012 [Page 57] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-----------+--------+----------+-----------------------------------+ + | Audio | SILK | Codebook | PDF | + | Bandwidth | Frame | Size | | + | | Size | | | + +-----------+--------+----------+-----------------------------------+ + | NB | 10 ms | 3 | {143, 50, 63}/256 | + | | | | | + | NB | 20 ms | 11 | {68, 12, 21, 17, 19, 22, 30, 24, | + | | | | 17, 16, 10}/256 | + | | | | | + | MB or WB | 10 ms | 12 | {91, 46, 39, 19, 14, 12, 8, 7, 6, | + | | | | 5, 5, 4}/256 | + | | | | | + | MB or WB | 20 ms | 34 | {33, 22, 18, 16, 15, 14, 14, 13, | + | | | | 13, 10, 9, 9, 8, 6, 6, 6, 5, 4, | + | | | | 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, | + | | | | 2, 1, 1, 1, 1} | + +-----------+--------+----------+-----------------------------------+ + + Table 26: PDFs for Subframe Pitch Contour + + +-------+------------------+ + | Index | Subframe Offsets | + +-------+------------------+ + | 0 | 0 0 | + | | | + | 1 | 1 0 | + | | | + | 2 | 0 1 | + +-------+------------------+ + + Table 27: Codebook Vectors for Subframe Pitch Contour: NB, 10 ms + Frames + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 58] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------+------------------+ + | Index | Subframe Offsets | + +-------+------------------+ + | 0 | 0 0 0 0 | + | | | + | 1 | 2 1 0 -1 | + | | | + | 2 | -1 0 1 2 | + | | | + | 3 | -1 0 0 1 | + | | | + | 4 | -1 0 0 0 | + | | | + | 5 | 0 0 0 1 | + | | | + | 6 | 0 0 1 1 | + | | | + | 7 | 1 1 0 0 | + | | | + | 8 | 1 0 0 0 | + | | | + | 9 | 0 0 0 -1 | + | | | + | 10 | 1 0 0 -1 | + +-------+------------------+ + + Table 28: Codebook Vectors for Subframe Pitch Contour: NB, 20 ms + Frames + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 59] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------+------------------+ + | Index | Subframe Offsets | + +-------+------------------+ + | 0 | 0 0 | + | | | + | 1 | 0 1 | + | | | + | 2 | 1 0 | + | | | + | 3 | -1 1 | + | | | + | 4 | 1 -1 | + | | | + | 5 | -1 2 | + | | | + | 6 | 2 -1 | + | | | + | 7 | -2 2 | + | | | + | 8 | 2 -2 | + | | | + | 9 | -2 3 | + | | | + | 10 | 3 -2 | + | | | + | 11 | -3 3 | + +-------+------------------+ + + Table 29: Codebook Vectors for Subframe Pitch Contour: MB or WB, + 10 ms Frames + + +-------+------------------+ + | Index | Subframe Offsets | + +-------+------------------+ + | 0 | 0 0 0 0 | + | | | + | 1 | 0 0 1 1 | + | | | + | 2 | 1 1 0 0 | + | | | + | 3 | -1 0 0 0 | + | | | + | 4 | 0 0 0 1 | + | | | + | 5 | 1 0 0 0 | + | | | + | 6 | -1 0 0 1 | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 60] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 7 | 0 0 0 -1 | + | | | + | 8 | -1 0 1 2 | + | | | + | 9 | 1 0 0 -1 | + | | | + | 10 | -2 -1 1 2 | + | | | + | 11 | 2 1 0 -1 | + | | | + | 12 | -2 0 0 2 | + | | | + | 13 | -2 0 1 3 | + | | | + | 14 | 2 1 -1 -2 | + | | | + | 15 | -3 -1 1 3 | + | | | + | 16 | 2 0 0 -2 | + | | | + | 17 | 3 1 0 -2 | + | | | + | 18 | -3 -1 2 4 | + | | | + | 19 | -4 -1 1 4 | + | | | + | 20 | 3 1 -1 -3 | + | | | + | 21 | -4 -1 2 5 | + | | | + | 22 | 4 2 -1 -3 | + | | | + | 23 | 4 1 -1 -4 | + | | | + | 24 | -5 -1 2 6 | + | | | + | 25 | 5 2 -1 -4 | + | | | + | 26 | -6 -2 2 6 | + | | | + | 27 | -5 -2 2 5 | + | | | + | 28 | 6 2 -1 -5 | + | | | + | 29 | -7 -2 3 8 | + | | | + | 30 | 6 2 -2 -6 | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 61] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 31 | 5 2 -2 -5 | + | | | + | 32 | 8 3 -2 -7 | + | | | + | 33 | -9 -3 3 9 | + +-------+------------------+ + + Table 30: Codebook Vectors for Subframe Pitch Contour: MB or WB, + 20 ms Frames + + The final pitch lag for each subframe is assembled in + silk_decode_pitch() (silk_decode_pitch.c). Let lag be the primary + pitch lag for the current SILK frame, contour_index be index of the + VQ codebook, and lag_cb[contour_index][k] be the corresponding entry + of the codebook from the appropriate table given above for the k'th + subframe. Then the final pitch lag for that subframe is + + pitch_lags[k] = clamp(lag_min, lag + lag_cb[contour_index][k], + lag_max) + + where lag_min and lag_max are the values from the "Minimum Lag" and + "Maximum Lag" columns of Table 24, respectively. + +4.2.4.4.2. LTP Filter Coefficients + + SILK can use a separate 5-tap pitch filter for each subframe. It + selects the filter to use from one of three codebooks. All of the + subframes in a SILK frame must choose their filter from the same + codebook, itself chosen via an explicitly-coded "periodicity index". + This immediately follows the subframe pitch lags, and is coded using + the 3-entry PDF from Table 31. + + +------------------+ + | PDF | + +------------------+ + | {77, 80, 99}/256 | + +------------------+ + + Table 31: Periodicity Index PDF + + The index of the filter for use for each subframe follows. They are + all coded using the PDF from Table 32 corresponding to the + periodicity index. Table 33 through Table 35 contain the + corresponding filter taps as signed Q7 integers. + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 62] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------------+----------+------------------------------------------+ + | Periodicity | Codebook | PDF | + | Index | Size | | + +-------------+----------+------------------------------------------+ + | 0 | 8 | {185, 15, 13, 13, 9, 9, 6, 6}/256 | + | | | | + | 1 | 16 | {57, 34, 21, 20, 15, 13, 12, 13, 10, 10, | + | | | 9, 10, 9, 8, 7, 8}/256 | + | | | | + | 2 | 32 | {15, 16, 14, 12, 12, 12, 11, 11, 11, 10, | + | | | 9, 9, 9, 9, 8, 8, 8, 8, 7, 7, 6, 6, 5, | + | | | 4, 5, 4, 4, 4, 3, 4, 3, 2}/256 | + +-------------+----------+------------------------------------------+ + + Table 32: Periodicity Index PDF + + +-------+---------------------+ + | Index | Filter Taps (Q7) | + +-------+---------------------+ + | 0 | 4 6 24 7 5 | + | | | + | 1 | 0 0 2 0 0 | + | | | + | 2 | 12 28 41 13 -4 | + | | | + | 3 | -9 15 42 25 14 | + | | | + | 4 | 1 -2 62 41 -9 | + | | | + | 5 | -10 37 65 -4 3 | + | | | + | 6 | -6 4 66 7 -8 | + | | | + | 7 | 16 14 38 -3 33 | + +-------+---------------------+ + + Table 33: Codebook Vectors for LTP Filter, Periodicity Index 0 + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 63] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-------+---------------------+ + | Index | Filter Taps (Q7) | + +-------+---------------------+ + | 0 | 13 22 39 23 12 | + | | | + | 1 | -1 36 64 27 -6 | + | | | + | 2 | -7 10 55 43 17 | + | | | + | 3 | 1 1 8 1 1 | + | | | + | 4 | 6 -11 74 53 -9 | + | | | + | 5 | -12 55 76 -12 8 | + | | | + | 6 | -3 3 93 27 -4 | + | | | + | 7 | 26 39 59 3 -8 | + | | | + | 8 | 2 0 77 11 9 | + | | | + | 9 | -8 22 44 -6 7 | + | | | + | 10 | 40 9 26 3 9 | + | | | + | 11 | -7 20 101 -7 4 | + | | | + | 12 | 3 -8 42 26 0 | + | | | + | 13 | -15 33 68 2 23 | + | | | + | 14 | -2 55 46 -2 15 | + | | | + | 15 | 3 -1 21 16 41 | + +-------+---------------------+ + + Table 34: Codebook Vectors for LTP Filter, Periodicity Index 1 + + +-------+---------------------+ + | Index | Filter Taps (Q7) | + +-------+---------------------+ + | 0 | -6 27 61 39 5 | + | | | + | 1 | -11 42 88 4 1 | + | | | + | 2 | -2 60 65 6 -4 | + | | | + | 3 | -1 -5 73 56 1 | + + + +Valin, et al. Expires February 17, 2012 [Page 64] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 4 | -9 19 94 29 -9 | + | | | + | 5 | 0 12 99 6 4 | + | | | + | 6 | 8 -19 102 46 -13 | + | | | + | 7 | 3 2 13 3 2 | + | | | + | 8 | 9 -21 84 72 -18 | + | | | + | 9 | -11 46 104 -22 8 | + | | | + | 10 | 18 38 48 23 0 | + | | | + | 11 | -16 70 83 -21 11 | + | | | + | 12 | 5 -11 117 22 -8 | + | | | + | 13 | -6 23 117 -12 3 | + | | | + | 14 | 3 -8 95 28 4 | + | | | + | 15 | -10 15 77 60 -15 | + | | | + | 16 | -1 4 124 2 -4 | + | | | + | 17 | 3 38 84 24 -25 | + | | | + | 18 | 2 13 42 13 31 | + | | | + | 19 | 21 -4 56 46 -1 | + | | | + | 20 | -1 35 79 -13 19 | + | | | + | 21 | -7 65 88 -9 -14 | + | | | + | 22 | 20 4 81 49 -29 | + | | | + | 23 | 20 0 75 3 -17 | + | | | + | 24 | 5 -9 44 92 -8 | + | | | + | 25 | 1 -3 22 69 31 | + | | | + | 26 | -6 95 41 -12 5 | + | | | + | 27 | 39 67 16 -4 1 | + | | | + + + +Valin, et al. Expires February 17, 2012 [Page 65] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 28 | 0 -6 120 55 -36 | + | | | + | 29 | -13 44 122 4 -24 | + | | | + | 30 | 81 5 11 3 7 | + | | | + | 31 | 2 0 9 10 88 | + +-------+---------------------+ + + Table 35: Codebook Vectors for LTP Filter, Periodicity Index 2 + +4.2.4.4.3. LTP Scaling Parameter + + After the LTP filter coefficients, an LTP scaling parameter may + appear. This allows the encoder to trade-off the prediction gain + between packets against the recovery time after packet loss. Like + the quantization gains, only the first LBRR frame in an Opus frame, + an LBRR frame where the prior LBRR frame was not coded, and the first + regular SILK frame in an Opus frame include this field, and, like all + of the other LTP parameters, only for frames that are also voiced. + Unlike absolute-coding for pitch lags, a SILK frame will not include + this field just because the prior frame was not voiced. + + If present, the value is coded using the 3-entry PDF in Table 36. + The three possible values represent Q14 scale factors of 15565, + 12288, and 8192, respectively (corresponding to approximately 0.95, + 0.75, and 0.5). Frames that do not code the scaling parameter use + the default factor of 15565 (0.95). + + +-------------------+ + | PDF | + +-------------------+ + | {128, 64, 64}/256 | + +-------------------+ + + Table 36: PDF for LTP Scaling Parameter + +4.2.4.5. Linear Congruential Generator (LCG) Seed + + SILK uses a linear congruential generator (LCG) to inject + pseudorandom noise into the quantized excitation. To ensure + synchronization of this process between the encoder and decoder, each + SILK frame stores a 2-bit seed after the LTP parameters (if any). + The encoder may consider the choice of this seed during quantization, + meaning the flexibility to choose the LCG seed can reduce distortion. + The seed is decoded with the uniform 4-entry PDF in Table 37, + yielding a value between 0 and 3, inclusive. + + + + +Valin, et al. Expires February 17, 2012 [Page 66] + +Internet-Draft Interactive Audio Codec August 2011 + + + +----------------------+ + | PDF | + +----------------------+ + | {64, 64, 64, 64}/256 | + +----------------------+ + + Table 37: PDF for LCG Seed + +4.2.4.6. Excitation + + SILK codes the excitation using a modified version of the Pyramid + Vector Quantization (PVQ) codebook [PVQ]. The PVQ codebook consists + of all sums of K signed, unit pulses in a vector of dimension N, + where two pulses at the same position are required to have the same + sign. Thus the codebook includes all integer codevectors y of + dimension N that satisfy + + N-1 + __ + \ abs(y[j]) = K . + /_ + j=0 + + Unlike regular PVQ, SILK uses a variable-length, rather than fixed- + length, encoding. This encoding is more suited to the Gaussian-like + distribution of the coefficient magnitudes and the non-uniform + distribution of their signs (caused by the quantization offset + described below). SILK also handles large codebooks by coding the + least significant bits (LSBs) of each coefficient directly. This + adds a small coding efficiency loss, but greatly reduces the + computation time and ROM size required for decoding, as implemented + in silk_decode_pulses() (silk_decode_pulses.c). + + SILK fixes the dimension of the codebook to N = 16. The excitation + is made up of a number of "shell blocks", each 16 samples in size. + Table 38 lists the number of shell blocks required for a SILK frame + for each possible audio bandwidth and frame size. 10 ms MB frames + nominally contain 120 samples (10 ms at 12 kHz), which is not a + multiple of 16. This is handled by coding 8 shell blocks (128 + samples) and discarding the final 8 samples of the last block. The + decoder contains no special case that prevents an encoder from + placing pulses in these samples, and they must be correctly parsed + from the bitstream if present, but they are otherwise ignored. + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 67] + +Internet-Draft Interactive Audio Codec August 2011 + + + +-----------------+------------+------------------------+ + | Audio Bandwidth | Frame Size | Number of Shell Blocks | + +-----------------+------------+------------------------+ + | NB | 10 ms | 5 | + | | | | + | MB | 10 ms | 8 | + | | | | + | WB | 10 ms | 10 | + | | | | + | NB | 20 ms | 10 | + | | | | + | MB | 20 ms | 15 | + | | | | + | WB | 20 ms | 20 | + +-----------------+------------+------------------------+ + + Table 38: Number of Shell Blocks Per SILK Frame + +4.2.4.6.1. Rate Level + + The first symbol in the excitation is a "rate level", which is an + index from 0 to 8, inclusive, coded using the PDF in Table 39 + corresponding to the signal type of the current frame (from + Section 4.2.4.1). The rate level selects the PDF used to decode the + number of pulses in the individual shell blocks. It does not + directly convey any information about the bitrate or the number of + pulses itself, but merely changes the probability of the symbols in + Section 4.2.4.6.2. Level 0 provides a more efficient encoding at low + rates generally, and level 8 provides a more efficient encoding at + high rates generally, though the most efficient level for a + particular SILK frame may depend on the exact distribution of the + coded symbols. An encoder should, but is not required to, use the + most efficient rate level. + + +----------------------+------------------------------------------+ + | Signal Type | PDF | + +----------------------+------------------------------------------+ + | Inactive or Unvoiced | {15, 51, 12, 46, 45, 13, 33, 27, 14}/256 | + | | | + | Voiced | {33, 30, 36, 17, 34, 49, 18, 21, 18}/256 | + +----------------------+------------------------------------------+ + + Table 39: PDFs for the Rate Level + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 68] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.2.4.6.2. Pulses Per Shell Block + + The total number of pulses in each of the shell blocks follows the + rate level. The pulse counts for all of the shell blocks are coded + in a row, before the content of any of the blocks. Each block may + have anywhere from 0 to 16 pulses, inclusive, coded using the 18- + entry PDF in Table 40 corresponding to the rate level from + Section 4.2.4.6.1. The special value 17 indicates that this block + has one or more additional LSBs to decode for each coefficient. If + it is encountered, another value is decoded using the PDF + corresponding to the special rate level 9 instead of the normal rate + level. This process repeats until a value less than 17 is decoded, + and the number of extra LSBs used is set to the number of 17's + decoded for that block. + + +----------+--------------------------------------------------------+ + | Rate | PDF | + | Level | | + +----------+--------------------------------------------------------+ + | 0 | {131, 74, 25, 8, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | + | | 1, 1}/256 | + | | | + | 1 | {58, 93, 60, 23, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, | + | | 1, 1}/256 | + | | | + | 2 | {43, 51, 46, 33, 24, 16, 11, 8, 6, 3, 3, 3, 2, 1, 1, | + | | 2, 1, 2}/256 | + | | | + | 3 | {17, 52, 71, 57, 31, 12, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, | + | | 1, 1}/256 | + | | | + | 4 | {6, 21, 41, 53, 49, 35, 21, 11, 6, 3, 2, 2, 1, 1, 1, | + | | 1, 1, 1}/256 | + | | | + | 5 | {7, 14, 22, 28, 29, 28, 25, 20, 17, 13, 11, 9, 7, 5, | + | | 4, 4, 3, 10}/256 | + | | | + | 6 | {2, 5, 14, 29, 42, 46, 41, 31, 19, 11, 6, 3, 2, 1, 1, | + | | 1, 1, 1}/256 | + | | | + | 7 | {1, 2, 4, 10, 19, 29, 35, 37, 34, 28, 20, 14, 8, 5, 4, | + | | 2, 2, 2}/256 | + | | | + | 8 | {1, 2, 2, 5, 9, 14, 20, 24, 27, 28, 26, 23, 20, 15, | + | | 11, 8, 6, 15}/256 | + | | | + + + + + +Valin, et al. Expires February 17, 2012 [Page 69] + +Internet-Draft Interactive Audio Codec August 2011 + + + | 9 | {1, 1, 1, 6, 27, 58, 56, 39, 25, 14, 10, 6, 3, 3, 2, | + | | 1, 1, 2}/256 | + +----------+--------------------------------------------------------+ + + Table 40: PDFs for the Pulse Count + +4.2.4.6.3. Pulse Magnitude Decoding + + The locations of the pulses in each shell block follows the pulse + counts, as decoded by silk_shell_decoder() (silk_shell_coder.c). As + with the pulse counts, these locations are coded for all the shell + blocks before any of the remaining information for each block. + Unlike many other codecs, SILK places no restriction on the + distribution of pulses within a shell block. All of the pulses may + be placed in a single location, or each one in a unique location, or + anything in-between. + + The location of pulses is coded by recursively partitioning each + block into halves, and coding how many pulses fall on the left side + of the split. All remaining pulses must fall on the right side of + the split. The process then recurses into the left half, and after + that returns, the right half (preorder traversal). The PDF to use is + chosen by the size of the current partition (16, 8, 4, or 2) and the + number of pulses in the partition (1 to 16, inclusive). Table 41 + through Table 44 list the PDFs use for each partition size and pulse + count. This process skips partitions without any pulses, i.e., where + the initial pulse count from Section 4.2.4.6.2 was zero, or where the + split in the prior level indicated that all of the pulses fell on the + other side. These partitions have nothing to code, so they require + no PDF. + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 70] + +Internet-Draft Interactive Audio Codec August 2011 + + + +------------+------------------------------------------------------+ + | Pulse | PDF | + | Count | | + +------------+------------------------------------------------------+ + | 1 | {126, 130}/256 | + | | | + | 2 | {56, 142, 58}/256 | + | | | + | 3 | {25, 101, 104, 26}/256 | + | | | + | 4 | {12, 60, 108, 64, 12}/256 | + | | | + | 5 | {7, 35, 84, 87, 37, 6}/256 | + | | | + | 6 | {4, 20, 59, 86, 63, 21, 3}/256 | + | | | + | 7 | {3, 12, 38, 72, 75, 42, 12, 2}/256 | + | | | + | 8 | {2, 8, 25, 54, 73, 59, 27, 7, 1}/256 | + | | | + | 9 | {2, 5, 17, 39, 63, 65, 42, 18, 4, 1}/256 | + | | | + | 10 | {1, 4, 12, 28, 49, 63, 54, 30, 11, 3, 1}/256 | + | | | + | 11 | {1, 4, 8, 20, 37, 55, 57, 41, 22, 8, 2, 1}/256 | + | | | + | 12 | {1, 3, 7, 15, 28, 44, 53, 48, 33, 16, 6, 1, 1}/256 | + | | | + | 13 | {1, 2, 6, 12, 21, 35, 47, 48, 40, 25, 12, 5, 1, | + | | 1}/256 | + | | | + | 14 | {1, 1, 4, 10, 17, 27, 37, 47, 43, 33, 21, 9, 4, 1, | + | | 1}/256 | + | | | + | 15 | {1, 1, 1, 8, 14, 22, 33, 40, 43, 38, 28, 16, 8, 1, | + | | 1, 1}/256 | + | | | + | 16 | {1, 1, 1, 1, 13, 18, 27, 36, 41, 41, 34, 24, 14, 1, | + | | 1, 1, 1}/256 | + +------------+------------------------------------------------------+ + + Table 41: PDFs for Pulse Count Split, 16 Sample Partitions + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 71] + +Internet-Draft Interactive Audio Codec August 2011 + + + +------------+------------------------------------------------------+ + | Pulse | PDF | + | Count | | + +------------+------------------------------------------------------+ + | 1 | {127, 129}/256 | + | | | + | 2 | {53, 149, 54}/256 | + | | | + | 3 | {22, 105, 106, 23}/256 | + | | | + | 4 | {11, 61, 111, 63, 10}/256 | + | | | + | 5 | {6, 35, 86, 88, 36, 5}/256 | + | | | + | 6 | {4, 20, 59, 87, 62, 21, 3}/256 | + | | | + | 7 | {3, 13, 40, 71, 73, 41, 13, 2}/256 | + | | | + | 8 | {3, 9, 27, 53, 70, 56, 28, 9, 1}/256 | + | | | + | 9 | {3, 8, 19, 37, 57, 61, 44, 20, 6, 1}/256 | + | | | + | 10 | {3, 7, 15, 28, 44, 54, 49, 33, 17, 5, 1}/256 | + | | | + | 11 | {1, 7, 13, 22, 34, 46, 48, 38, 28, 14, 4, 1}/256 | + | | | + | 12 | {1, 1, 11, 22, 27, 35, 42, 47, 33, 25, 10, 1, 1}/256 | + | | | + | 13 | {1, 1, 6, 14, 26, 37, 43, 43, 37, 26, 14, 6, 1, | + | | 1}/256 | + | | | + | 14 | {1, 1, 4, 10, 20, 31, 40, 42, 40, 31, 20, 10, 4, 1, | + | | 1}/256 | + | | | + | 15 | {1, 1, 3, 8, 16, 26, 35, 38, 38, 35, 26, 16, 8, 3, | + | | 1, 1}/256 | + | | | + | 16 | {1, 1, 2, 6, 12, 21, 30, 36, 38, 36, 30, 21, 12, 6, | + | | 2, 1, 1}/256 | + +------------+------------------------------------------------------+ + + Table 42: PDFs for Pulse Count Split, 8 Sample Partitions + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 72] + +Internet-Draft Interactive Audio Codec August 2011 + + + +------------+------------------------------------------------------+ + | Pulse | PDF | + | Count | | + +------------+------------------------------------------------------+ + | 1 | {127, 129}/256 | + | | | + | 2 | {49, 157, 50}/256 | + | | | + | 3 | {20, 107, 109, 20}/256 | + | | | + | 4 | {11, 60, 113, 62, 10}/256 | + | | | + | 5 | {7, 36, 84, 87, 36, 6}/256 | + | | | + | 6 | {6, 24, 57, 82, 60, 23, 4}/256 | + | | | + | 7 | {5, 18, 39, 64, 68, 42, 16, 4}/256 | + | | | + | 8 | {6, 14, 29, 47, 61, 52, 30, 14, 3}/256 | + | | | + | 9 | {1, 15, 23, 35, 51, 50, 40, 30, 10, 1}/256 | + | | | + | 10 | {1, 1, 21, 32, 42, 52, 46, 41, 18, 1, 1}/256 | + | | | + | 11 | {1, 6, 16, 27, 36, 42, 42, 36, 27, 16, 6, 1}/256 | + | | | + | 12 | {1, 5, 12, 21, 31, 38, 40, 38, 31, 21, 12, 5, 1}/256 | + | | | + | 13 | {1, 3, 9, 17, 26, 34, 38, 38, 34, 26, 17, 9, 3, | + | | 1}/256 | + | | | + | 14 | {1, 3, 7, 14, 22, 29, 34, 36, 34, 29, 22, 14, 7, 3, | + | | 1}/256 | + | | | + | 15 | {1, 2, 5, 11, 18, 25, 31, 35, 35, 31, 25, 18, 11, 5, | + | | 2, 1}/256 | + | | | + | 16 | {1, 1, 4, 9, 15, 21, 28, 32, 34, 32, 28, 21, 15, 9, | + | | 4, 1, 1}/256 | + +------------+------------------------------------------------------+ + + Table 43: PDFs for Pulse Count Split, 4 Sample Partitions + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 73] + +Internet-Draft Interactive Audio Codec August 2011 + + + +------------+------------------------------------------------------+ + | Pulse | PDF | + | Count | | + +------------+------------------------------------------------------+ + | 1 | {128, 128}/256 | + | | | + | 2 | {42, 172, 42}/256 | + | | | + | 3 | {21, 107, 107, 21}/256 | + | | | + | 4 | {12, 60, 112, 61, 11}/256 | + | | | + | 5 | {8, 34, 86, 86, 35, 7}/256 | + | | | + | 6 | {8, 23, 55, 90, 55, 20, 5}/256 | + | | | + | 7 | {5, 15, 38, 72, 72, 36, 15, 3}/256 | + | | | + | 8 | {6, 12, 27, 52, 77, 47, 20, 10, 5}/256 | + | | | + | 9 | {6, 19, 28, 35, 40, 40, 35, 28, 19, 6}/256 | + | | | + | 10 | {4, 14, 22, 31, 37, 40, 37, 31, 22, 14, 4}/256 | + | | | + | 11 | {3, 10, 18, 26, 33, 38, 38, 33, 26, 18, 10, 3}/256 | + | | | + | 12 | {2, 8, 13, 21, 29, 36, 38, 36, 29, 21, 13, 8, 2}/256 | + | | | + | 13 | {1, 5, 10, 17, 25, 32, 38, 38, 32, 25, 17, 10, 5, | + | | 1}/256 | + | | | + | 14 | {1, 4, 7, 13, 21, 29, 35, 36, 35, 29, 21, 13, 7, 4, | + | | 1}/256 | + | | | + | 15 | {1, 2, 5, 10, 17, 25, 32, 36, 36, 32, 25, 17, 10, 5, | + | | 2, 1}/256 | + | | | + | 16 | {1, 2, 4, 7, 13, 21, 28, 34, 36, 34, 28, 21, 13, 7, | + | | 4, 2, 1}/256 | + +------------+------------------------------------------------------+ + + Table 44: PDFs for Pulse Count Split, 2 Sample Partitions + +4.2.5. LBRR Frames + + LBRR frames, if present, immediately follow the header bits, prior to + any regular SILK frames. Each frame whose LBRR flag was set includes + a separate set of data for each channel. + + + +Valin, et al. Expires February 17, 2012 [Page 74] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.3. CELT Decoder + + The CELT layer is decoded based on the following symbols and sets of + symbols: + + +---------------+-----------------------------------+---------------+ + | Symbol(s) | PDF | Condition | + +---------------+-----------------------------------+---------------+ + | silence | {32767, 1}/32768 | | + | | | | + | post-filter | {1, 1}/2 | | + | | | | + | octave | uniform (6) | post-filter | + | | | | + | period | raw bits (4+octave) | post-filter | + | | | | + | gain | raw bits (3) | post-filter | + | | | | + | tapset | {2, 1, 1}/4 | post-filter | + | | | | + | transient | {7, 1}/8 | | + | | | | + | intra | {7, 1}/8 | | + | | | | + | coarse energy | Section 4.3.2 | | + | | | | + | tf_change | Section 4.3.1 | | + | | | | + | tf_select | {1, 1}/2 | Section 4.3.1 | + | | | | + | spread | {7, 2, 21, 2}/32 | | + | | | | + | dyn. alloc. | Section 4.3.3 | | + | | | | + | alloc. trim | {2, 2, 5, 10, 22, 46, 22, 10, 5, | | + | | 2, 2}/128 | | + | | | | + | skip | {1, 1}/2 | Section 4.3.3 | + | | | | + | intensity | uniform | Section 4.3.3 | + | | | | + | dual | {1, 1}/2 | | + | | | | + | fine energy | Section 4.3.2 | | + | | | | + | residual | Section 4.3.4 | | + | | | | + | anti-collapse | {1, 1}/2 | Section 4.3.5 | + + + +Valin, et al. Expires February 17, 2012 [Page 75] + +Internet-Draft Interactive Audio Codec August 2011 + + + | finalize | Section 4.3.2 | | + +---------------+-----------------------------------+---------------+ + + Order of the symbols in the CELT section of the bit-stream. + + Table 45 + + The decoder extracts information from the range-coded bit-stream in + the order described in the figure above. In some circumstances, it + is possible for a decoded value to be out of range due to a very + small amount of redundancy in the encoding of large integers by the + range coder. In that case, the decoder should assume there has been + an error in the coding, decoding, or transmission and SHOULD take + measures to conceal the error and/or report to the application that a + problem has occurred. + +4.3.1. Transient Decoding + + The "transient" flag encoded in the bit-stream has a probability of + 1/8. When it is set, then the MDCT coefficients represent multiple + short MDCTs in the frame. When not set, the coefficients represent a + single long MDCT for the frame. In addition to the global transient + flag is a per-band binary flag to change the time-frequency (tf) + resolution independently in each band. The change in tf resolution + is defined in tf_select_table[][] in celt.c and depends on the frame + size, whether the transient flag is set, and the value of tf_select. + The tf_select flag uses a 1/2 probability, but is only decoded if it + can have an impact on the result knowing the value of all per-band + tf_change flags. + +4.3.2. Energy Envelope Decoding + + It is important to quantize the energy with sufficient resolution + because any energy quantization error cannot be compensated for at a + later stage. Regardless of the resolution used for encoding the + shape of a band, it is perceptually important to preserve the energy + in each band. CELT uses a three-step coarse-fine-fine strategy for + encoding the energy in the base-2 log domain, as implemented in + quant_bands.c + +4.3.2.1. Coarse energy decoding + + Coarse quantization of the energy uses a fixed resolution of 6 dB + (integer part of base-2 log). To minimize the bitrate, prediction is + applied both in time (using the previous frame) and in frequency + (using the previous bands). The part of the prediction that is based + on the previous frame can be disabled, creating an "intra" frame + where the energy is coded without reference to prior frames. The + + + +Valin, et al. Expires February 17, 2012 [Page 76] + +Internet-Draft Interactive Audio Codec August 2011 + + + decoder first reads the intra flag to determine what prediction is + used. The 2-D z-transform of the prediction filter is: + + -1 -1 + (1 - alpha*z_l )*(1 - z_b ) + A(z_l, z_b) = ----------------------------- + -1 + 1 - beta*z_b + + where b is the band index and l is the frame index. The prediction + coefficients applied depend on the frame size in use when not using + intra energy and are alpha=0, beta=4915/32768 when using intra + energy. The time-domain prediction is based on the final fine + quantization of the previous frame, while the frequency domain + (within the current frame) prediction is based on coarse quantization + only (because the fine quantization has not been computed yet). The + prediction is clamped internally so that fixed point implementations + with limited dynamic range do not suffer desynchronization. We + approximate the ideal probability distribution of the prediction + error using a Laplace distribution with separate parameters for each + frame size in intra and inter-frame modes. The coarse energy + quantization is performed by unquant_coarse_energy() and + unquant_coarse_energy_impl() (quant_bands.c). The encoding of the + Laplace-distributed values is implemented in ec_laplace_decode() + (laplace.c). + +4.3.2.2. Fine energy quantization + + The number of bits assigned to fine energy quantization in each band + is determined by the bit allocation computation described in + Section 4.3.3. Let B_i be the number of fine energy bits for band i; + the refinement is an integer f in the range [0,2**B_i-1]. The + mapping between f and the correction applied to the coarse energy is + equal to (f+1/2)/2**B_i - 1/2. Fine energy quantization is + implemented in quant_fine_energy() (quant_bands.c). + + When some bits are left "unused" after all other flags have been + decoded, these bits are assigned to a "final" step of fine + allocation. In effect, these bits are used to add one extra fine + energy bit per band per channel. The allocation process determines + two "priorities" for the final fine bits. Any remaining bits are + first assigned only to bands of priority 0, starting from band 0 and + going up. If all bands of priority 0 have received one bit per + channel, then bands of priority 1 are assigned an extra bit per + channel, starting from band 0. If any bit is left after this, they + are left unused. This is implemented in unquant_energy_finalise() + (quant_bands.c). + + + + +Valin, et al. Expires February 17, 2012 [Page 77] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.3.3. Bit allocation + + Many codecs transmit significant amounts of side information for the + purpose of controlling bit allocation within a frame. Often this + side information controls bit usage indirectly and must be carefully + selected to achieve the desired rate constraints. + + The band-energy normalized structure of Opus MDCT mode ensures that a + constant bit allocation for the shape content of a band will result + in a roughly constant tone to noise ratio, which provides for fairly + consistent perceptual performance. The effectiveness of this + approach is the result of two factors: The band energy, which is + understood to be perceptually important on its own, is always + preserved regardless of the shape precision and because the constant + tone-to-noise ratio implies a constant intra-band noise to masking + ratio. Intra-band masking is the strongest of the perceptual masking + effects. This structure means that the ideal allocation is more + consistent from frame to frame than it is for other codecs without an + equivalent structure. + + Because the bit allocation is used to drive the decoding of the + range-coder stream it MUST be recovered exactly so that identical + coding decisions are made in the encoder and decoder. Any deviation + from the reference's resulting bit allocation will result in + corrupted output, though implementers are free to implement the + procedure in any way which produces identical results. + + Because all of the information required to decode a frame must be + derived from that frame alone in order to retain robustness to packet + loss the overhead of explicitly signaling the allocation would be + considerable, especially for low-latency (small frame size) + applications, even though the allocation is relatively static. + + For this reason, in the MDCT mode Opus uses a primarily implicit bit + allocation. The available bit-stream capacity is known in advance to + both the encoder and decoder without additional signaling, ultimately + from the packet sizes expressed by a higher level protocol. Using + this information the codec interpolates an allocation from a hard- + coded table. + + While the band-energy structure effectively models intra-band + masking, it ignores the weaker inter-band masking, band-temporal + masking, and other less significant perceptual effects. While these + effects can often be ignored they can become significant for + particular samples. One mechanism available to encoders would be to + simply increase the overall rate for these frames, but this is not + possible in a constant rate mode and can be fairly inefficient. As a + result three explicitly signaled mechanisms are provided to alter the + + + +Valin, et al. Expires February 17, 2012 [Page 78] + +Internet-Draft Interactive Audio Codec August 2011 + + + implicit allocation: + + o Band boost + + o Allocation trim + + o band skipping + + The first of these mechanisms, band boost, allows an encoder to boost + the allocation in specific bands. The second, allocation trim, works + by biasing the overall allocation towards higher or lower frequency + bands. The third, band skipping, selects which low-precision high + frequency bands will be allocated no shape bits at all. + + In stereo mode there are also two additional parameters potentially + coded as part of the allocation procedure: a parameter to allow the + selective elimination of allocation for the 'side' in jointly coded + bands, and a flag to deactivate joint coding. These values are not + signaled if they would be meaningless in the overall context of the + allocation. + + Because every signaled adjustment increases overhead and + implementation complexity none were included speculatively: The + reference encoder makes use of all of these mechanisms. While the + decision logic in the reference was found to be effective enough to + justify the overhead and complexity further analysis techniques may + be discovered which increase the effectiveness of these parameters. + As with other signaled parameters, encoder is free to choose the + values in any manner but unless a technique is known to deliver + superior perceptual results the methods used by the reference + implementation should be used. + + The process of allocation consists of the following steps: + determining the per-band maximum allocation vector, decoding the + boosts, decoding the tilt, determining the remaining capacity the + frame, searching the mode table for the entry nearest but not + exceeding the available space (subject to the tilt, boosts, band + maximums, and band minimums), linear interpolation, reallocation of + unused bits with concurrent skip decoding, determination of the fine- + energy vs shape split, and final reallocation. This process results + in an shape allocation per-band (in 1/8th bit units), a per-band + fine-energy allocation (in 1 bit per channel units), a set of band + priorities for controlling the use of remaining bits at the end of + the frame, and a remaining balance of unallocated space which is + usually zero except at very high rates. + + The maximum allocation vector is an approximation of the maximum + space which can be used by each band for a given mode. The value is + + + +Valin, et al. Expires February 17, 2012 [Page 79] + +Internet-Draft Interactive Audio Codec August 2011 + + + approximate because the shape encoding is variable rate (due to + entropy coding of splitting parameters). Setting the maximum too low + reduces the maximum achievable quality in a band while setting it too + high may result in waste: bit-stream capacity available at the end of + the frame which can not be put to any use. The maximums specified by + the codec reflect the average maximum. In the reference the maximums + are provided partially computed form, in order to fit in less memory, + as a static table (XXX cache.caps). Implementations are expected to + simply use the same table data but the procedure for generating this + table is included in rate.c as part of compute_pulse_cache(). + + To convert the values in cache.caps into the actual maximums: First + set nbBands to the maximum number of bands for this mode and stereo + to zero if stereo is not in use and one otherwise. For each band + assign N to the number of MDCT bins covered by the band (for one + channel), set LM to the shift value for the frame size (e.g. 0 for + 120, 1 for 240, 3 for 480) then set i to nbBands*(2*LM+stereo). Then + set the maximum for the band to the i-th index of cache.caps + 64 and + multiply by the number of channels in the current frame (one or two) + and by N then divide the result by 4 using truncating integer + division. The resulting vector will be called cap[]. The elements + fit in signed 16 bit integers but do not fit in 8 bits. This + procedure is implemented in the reference in the function init_caps() + in celt.c. + + The band boosts are represented by a series of binary symbols which + are coded with very low probability. Each band can potentially be + boosted multiple times, subject to the frame actually having enough + room to obey the boost and having enough room to code the boost + symbol. The default coding cost for a boost starts out at six bits, + but subsequent boosts in a band cost only a single bit and every time + a band is boosted the initial cost is reduced (down to a minimum of + two). Since the initial cost of coding a boost is 6 bits the coding + cost of the boost symbols when completely unused is 0.48 bits/frame + for a 21 band mode (21*-log2(1-1/2**6)). + + To decode the band boosts: First set 'dynalloc_logp' to 6, the + initial amount of storage required to signal a boost in bits, + 'total_bits' to the size of the frame in 8th-bits, 'total_boost' to + zero, and 'tell' to the total number of 8th bits decoded so far. For + each band from the coding start (0 normally, but 17 in hybrid mode) + to the coding end (which changes depending on the signaled + bandwidth): Set 'width' to the number of MDCT bins in this band for + all channels. Take the larger of width and 64, then the minimum of + that value and the width times eight and set 'quanta' to the result. + This represents a boost step size of six bits subject to limits of + 1/bit/sample and 1/8th bit/sample. Set 'boost' to zero and + 'dynalloc_loop_logp' to dynalloc_logp. While dynalloc_loop_log (the + + + +Valin, et al. Expires February 17, 2012 [Page 80] + +Internet-Draft Interactive Audio Codec August 2011 + + + current worst case symbol cost) in 8th bits plus tell is less than + total_bits plus total_boost and boost is less than cap[] for this + band: Decode a bit from the bitstream with a with dynalloc_loop_logp + as the cost of a one, update tell to reflect the current used + capacity, if the decoded value is zero break the loop otherwise add + quanta to boost and total_boost, subtract quanta from total_bits, and + set dynalloc_loop_log to 1. When the while loop finishes boost + contains the boost for this band. If boost is non-zero and + dynalloc_logp is greater than 2 decrease dynalloc_logp. Once this + process has been execute on all bands the band boosts have been + decoded. This procedure is implemented around line 2352 of celt.c. + + At very low rates it's possible that there won't be enough available + space to execute the inner loop even once. In these cases band boost + is not possible but its overhead is completely eliminated. Because + of the high cost of band boost when activated a reasonable encoder + should not be using it at very low rates. The reference implements + its dynalloc decision logic at around 1269 of celt.c + + The allocation trim is a integer value from 0-10. The default value + of 5 indicates no trim. The trim parameter is entropy coded in order + to lower the coding cost of less extreme adjustments. Values lower + than 5 bias the allocation towards lower frequencies and values above + 5 bias it towards higher frequencies. Like other signaled + parameters, signaling of the trim is gated so that it is not included + if there is insufficient space available in the bitstream. To decode + the trim first set the trim value to 5 then iff the count of decoded + 8th bits so far (ec_tell_frac) plus 48 (6 bits) is less than or equal + to the total frame size in 8th bits minus total_boost (a product of + the above band boost procedure) then decode the trim value using the + inverse CDF {127, 126, 124, 119, 109, 87, 41, 19, 9, 4, 2, 0}. + + Stereo parameters + + Anti-collapse reservation + + The allocation computation first begins by setting up some initial + conditions. 'total' is set to the available remaining 8th bits, + computed by taking the size of the coded frame times 8 and + subtracting ec_tell_frac(). From this value one (8th bit) is + subtracted to assure that the resulting allocation will be + conservative. 'anti_collapse_rsv' is set to 8 (8th bits) iff the + frame is a transient, LM is greater than 1, and total is greater than + or equal to (LM+2) * 8. Total is then decremented by + anti_collapse_rsv and clamped to be equal to or greater than zero. + 'skip_rsv' is set to 8 (8th bits) if total is greater than 8, + otherwise it is zero. Total is then decremented by skip_rsv. This + reserves space for the final skipping flag. + + + +Valin, et al. Expires February 17, 2012 [Page 81] + +Internet-Draft Interactive Audio Codec August 2011 + + + If the current frame is stereo intensity_rsv is set to the + conservative log2 in 8th bits of the number of coded bands for this + frame (given by the table LOG2_FRAC_TABLE). If intensity_rsv is + greater than total then intensity_rsv is set to zero otherwise total + is decremented by intensity_rsv, and if total is still greater than 8 + dual_stereo_rsv is set to 8 and total is decremented by + dual_stereo_rsv. + + The allocation process then computes a vector representing the hard + minimum amounts allocation any band will receive for shape. This + minimum is higher than the technical limit of the PVQ process, but + very low rate allocations produce excessively an sparse spectrum and + these bands are better served by having no allocation at all. For + each coded band set thresh[band] to twenty-four times the number of + MDCT bins in the band and divide by 16. If 8 times the number of + channels is greater, use that instead. This sets the minimum + allocation to one bit per channel or 48 128th bits per MDCT bin, + whichever is greater. The band size dependent part of this value is + not scaled by the channel count because at the very low rates where + this limit is applicable there will usually be no bits allocated to + the side. + + The previously decoded allocation trim is used to derive a vector of + per-band adjustments, 'trim_offsets[]'. For each coded band take the + alloc_trim and subtract 5 and LM then multiply the result by number + of channels, the number MDCT bins in the shortest frame size for this + mode, the number remaining bands, 2**LM, and 8. Then divide this + value by 64. Finally, if the number of MDCT bins in the band per + channel is only one 8 times the number of channels is subtracted in + order to diminish the allocation by one bit because width 1 bands + receive greater benefit from the coarse energy coding. + +4.3.4. Shape Decoder + + In each band, the normalized "shape" is encoded using a vector + quantization scheme called a "Pyramid vector quantizer". + + In the simplest case, the number of bits allocated in Section 4.3.3 + is converted to a number of pulses as described by Section 4.3.4.1. + Knowing the number of pulses and the number of samples in the band, + the decoder calculates the size of the codebook as detailed in + Section 4.3.4.2. The size is used to decode an unsigned integer + (uniform probability model), which is the codeword index. This index + is converted into the corresponding vector as explained in + Section 4.3.4.2. This vector is then scaled to unit norm. + + + + + + +Valin, et al. Expires February 17, 2012 [Page 82] + +Internet-Draft Interactive Audio Codec August 2011 + + +4.3.4.1. Bits to Pulses + + Although the allocation is performed in 1/8th bit units, the + quantization requires an integer number of pulses K. To do this, the + encoder searches for the value of K that produces the number of bits + that is the nearest to the allocated value (rounding down if exactly + half-way between two values), subject to not exceeding the total + number of bits available. For efficiency reasons the search is + performed against a precomputed allocation table which only permits + some K values for each N. The number of codebooks entries can be + computed as explained in Section 5.3.5.2. The difference between the + number of bits allocated and the number of bits used is accumulated + to a "balance" (initialized to zero) that helps adjusting the + allocation for the next bands. One third of the balance is applied + to the bit allocation of the each band to help achieving the target + allocation. The only exceptions are the band before the last and the + last band, for which half the balance and the whole balance are + applied, respectively. + +4.3.4.2. Index Decoding + + The codeword is decoded as a uniformly-distributed integer value by + decode_pulses() (cwrs.c). The codeword is converted from a unique + index in the same way as specified in [PVQ]. The indexing is based + on the calculation of V(N,K) (denoted N(L,K) in [PVQ]), which is the + number of possible combinations of K pulses in N samples. The number + of combinations can be computed recursively as V(N,K) = V(N-1,K) + + V(N,K-1) + V(N-1,K-1), with V(N,0) = 1 and V(0,K) = 0, K != 0. There + are many different ways to compute V(N,K), including pre-computed + tables and direct use of the recursive formulation. The reference + implementation applies the recursive formulation one line (or column) + at a time to save on memory use, along with an alternate, univariate + recurrence to initialize an arbitrary line, and direct polynomial + solutions for small N. All of these methods are equivalent, and have + different trade-offs in speed, memory usage, and code size. + Implementations MAY use any methods they like, as long as they are + equivalent to the mathematical definition. + + The decoding of the codeword from the index is performed as specified + in [PVQ], as implemented in function decode_pulses() (cwrs.c). + +4.3.4.3. Spreading + +4.3.4.4. Split decoding + + To avoid the need for multi-precision calculations when decoding PVQ + codevectors, the maximum size allowed for codebooks is 32 bits. When + larger codebooks are needed, the vector is instead split in two sub- + + + +Valin, et al. Expires February 17, 2012 [Page 83] + +Internet-Draft Interactive Audio Codec August 2011 + + + vectors of size N/2. A quantized gain parameter with precision + derived from the current allocation is entropy coded to represent the + relative gains of each side of the split and the entire decoding + process is recursively applied. Multiple levels of splitting may be + applied up to a frame size dependent limit. The same recursive + mechanism is applied for the joint coding of stereo audio. + +4.3.4.5. Time-Frequency change + +4.3.5. Anti-collapse processing + + When the frame has the transient bit set, an anti-collapse bit is + decoded. When anti-collapse is set, then the energy in each small + MDCT is prevented from collapsing to zero. For each band of each + MDCT where a collapse is detected, a pseudo-random signal is inserted + with an energy corresponding to the min energy over the two previous + frames. A renormalization step is then required to ensure that the + anti-collapse step did not alter the energy preservation property. + +4.3.6. Denormalization + + Just like each band was normalized in the encoder, the last step of + the decoder before the inverse MDCT is to denormalize the bands. + Each decoded normalized band is multiplied by the square root of the + decoded energy. This is done by denormalise_bands() (bands.c). + +4.3.7. Inverse MDCT + + The inverse MDCT implementation has no special characteristics. The + input is N frequency-domain samples and the output is 2*N time-domain + samples, while scaling by 1/2. The output is windowed using the same + window as the encoder. The IMDCT and windowing are performed by + mdct_backward (mdct.c). If a time-domain pre-emphasis window was + applied in the encoder, the (inverse) time-domain de-emphasis window + is applied on the IMDCT result. + +4.3.7.1. Post-filter + + The output of the inverse MDCT (after weighted overlap-add) is sent + to the post-filter. Although the post-filter is applied at the end, + the post-filter parameters are encoded at the beginning, just after + the silence flag. The post-filter can be switched on or off using + one bit (logp=1). If the post-filter is enabled, then the octave is + decoded as an integer value between 0 and 6 of uniform probability. + Once the octave is known, the fine pitch within the octave is decoded + using 4+octave raw bits. The final pitch period is equal to + (16<| rate |--->|encoder|--+ + | |conversion| | | | + audio | +----------+ +-------+ | +-------+ + ------+ +--->| Range | + | +-------+ |encoder|----> + | | CELT | +--->| | bit-stream + +->|encoder|------------------+ +-------+ + | | + +-------+ + + +5.1. Range Coder + + The range coder also acts as the bit-packer for Opus. It is used in + three different ways, to encode: + + o entropy-coded symbols with a fixed probability model using + ec_encode(), (entenc.c) + + o integers from 0 to 2**M-1 using ec_enc_uint() or ec_enc_bits(), + (entenc.c) + + o integers from 0 to N-1 (where N is not a power of two) using + ec_enc_uint(). (entenc.c) + + The range encoder maintains an internal state vector composed of the + four-tuple (low,rng,rem,ext), representing the low end of the current + range, the size of the current range, a single buffered output octet, + and a count of additional carry-propagating output octets. Both rng + and low are 32-bit unsigned integer values, rem is an octet value or + the special value -1, and ext is an integer with at least 16 bits. + This state vector is initialized at the start of each each frame to + the value (0,2**31,-1,0). The reference implementation re-uses the + 'val' field of the entropy coder structure to hold low, in order to + allow the same structure to be used for encoding and decoding, but we + maintain the distinction here for clarity. + +5.1.1. Encoding Symbols + + The main encoding function is ec_encode() (entenc.c), which takes as + an argument a three-tuple (fl,fh,ft) describing the range of the + + + +Valin, et al. Expires February 17, 2012 [Page 88] + +Internet-Draft Interactive Audio Codec August 2011 + + + symbol to be encoded in the current context, with 0 <= fl < fh <= ft + <= 65535. The values of this tuple are derived from the probability + model for the symbol. Let f(i) be the frequency of the i'th symbol + in the current context. Then the three-tuple corresponding to the + k'th symbol is given by fl=sum(f(i),i + 2**23. First, the top 9 bits of low, (low>>23), are placed into a + carry buffer. Then, low is set to (low << 8 & 0x7FFFFFFF) and rng is + set to (rng<<8). This process is carried out by ec_enc_normalize() + (entenc.c). + + The 9 bits produced in each iteration of the normalization loop + consist of 8 data bits and a carry flag. The final value of the + output bits is not determined until carry propagation is accounted + for. Therefore the reference implementation buffers a single (non- + propagating) output octet and keeps a count of additional propagating + (0xFF) output octets. An implementation MAY choose to use any + mathematically equivalent scheme to perform carry propagation. + + The function ec_enc_carry_out() (entenc.c) performs this buffering. + It takes a 9-bit input value, c, from the normalization: 8 bits of + output and a carry bit. If c is 0xFF, then ext is incremented and no + octets are output. Otherwise, if rem is not the special value -1, + then the octet (rem+(c>>8)) is output. Then ext octets are output + with the value 0 if the carry bit is set, or 0xFF if it is not, and + rem is set to the lower 8 bits of c. After this, ext is set to zero. + + In the reference implementation, a special version of ec_encode() + called ec_encode_bin() (entenc.c) is defined to take a two-tuple + (fl,ftb), where 0 <= fl < 2**ftb and ftb < 16. It is mathematically + equivalent to calling ec_encode() with the three-tuple (fl,fl+ + 1,1<8, then the top 8 bits of fl are encoded using + ec_encode() with the three-tuple (fl>>ftb-8,(fl>>ftb-8)+ + 1,(ft-1>>ftb-8)+1), and the remaining bits are encoded as raw bits. + Otherwise, fl is encoded with ec_encode() directly using the three- + tuple (fl,fl+1,ft). + +5.1.4. Finalizing the Stream + + After all symbols are encoded, the stream must be finalized by + outputting a value inside the current range. Let end be the integer + in the interval [low,low+rng) with the largest number of trailing + zero bits, b, such that end+(1<>23), are sent to the carry buffer, and end is replaced by + (end<<8&0x7FFFFFFF). Finally, if the value in carry buffer, rem, is + neither zero nor the special value -1, or the carry count, ext, is + greater than zero, then 9 zero bits are sent to the carry buffer. + After the carry buffer is finished outputting octets, the rest of the + output buffer (if any) is padded with zero bits, until it reaches the + raw bits. Finally, rem is set to the special value -1. This process + is implemented by ec_enc_done() (entenc.c). + +5.1.5. Current Bit Usage + + The bit allocation routines in Opus need to be able to determine a + conservative upper bound on the number of bits that have been used to + encode the current frame thus far. This drives allocation decisions + and ensures that the range coder and raw bits will not overflow the + output buffer. This is computed in the reference implementation to + whole-bit precision by the function ec_tell() (entcode.h) and to + + + +Valin, et al. Expires February 17, 2012 [Page 90] + +Internet-Draft Interactive Audio Codec August 2011 + + + fractional 1/8th bit precision by the function ec_tell_frac() + (entcode.c). Like all operations in the range coder, it must be + implemented in a bit-exact manner, and must produce exactly the same + value returned by the same functions in the decoder after decoding + the same symbols. + +5.2. SILK Encoder + + In the following, we focus on the core encoder and describe its + components. For simplicity, we will refer to the core encoder simply + as the encoder in the remainder of this document. An overview of the + encoder is given in Figure 11. + + + +---+ + +----------------------------->| | + +---------+ | +---------+ | | + |Voice | | |LTP | | | + +----->|Activity |-----+ +---->|Scaling |---------+--->| | + | |Detector | 3 | | |Control |<+ 12 | | | + | +---------+ | | +---------+ | | | | + | | | +---------+ | | | | + | | | |Gains | | 11 | | | + | | | +->|Processor|-|---+---|--->| R | + | | | | | | | | | | a | + | \/ | | +---------+ | | | | n | + | +---------+ | | +---------+ | | | | g | + | |Pitch | | | |LSF | | | | | e | + | +->|Analysis |-+ | |Quantizer|-|---|---|--->| | + | | | |4| | | | | 8 | | | E |-> + | | +---------+ | | +---------+ | | | | n |14 + | | | | 9/\ 10| | | | | c | + | | | | | \/ | | | | o | + | | +---------+ | | +----------+| | | | d | + | | |Noise | +--|->|Prediction|+---|---|--->| e | + | +->|Shaping |-|--+ |Analysis || 7 | | | r | + | | |Analysis |5| | | || | | | | + | | +---------+ | | +----------+| | | | | + | | | | /\ | | | | | + | | +---------|--|-------+ | | | | | + | | | \/ \/ \/ \/ \/ | | + | +---------+ | | +---------+ +------------+ | | + | |High-Pass| | | | | |Noise | | | + -+->|Filter |-+----+----->|Prefilter|------>|Shaping |->| | + 1 | | 2 | | 6 |Quantization|13| | + +---------+ +---------+ +------------+ +---+ + + 1: Input speech signal + + + +Valin, et al. Expires February 17, 2012 [Page 91] + +Internet-Draft Interactive Audio Codec August 2011 + + + 2: High passed input signal + 3: Voice activity estimate + 4: Pitch lags (per 5 ms) and voicing decision (per 20 ms) + 5: Noise shaping quantization coefficients + - Short term synthesis and analysis + noise shaping coefficients (per 5 ms) + - Long term synthesis and analysis noise + shaping coefficients (per 5 ms and for voiced speech only) + - Noise shaping tilt (per 5 ms) + - Quantizer gain/step size (per 5 ms) + 6: Input signal filtered with analysis noise shaping filters + 7: Short and long term prediction coefficients + LTP (per 5 ms) and LPC (per 20 ms) + 8: LSF quantization indices + 9: LSF coefficients + 10: Quantized LSF coefficients + 11: Processed gains, and synthesis noise shape coefficients + 12: LTP state scaling coefficient. Controlling error propagation + / prediction gain trade-off + 13: Quantized signal + 14: Range encoded bitstream + + + + Encoder block diagram. + + Figure 11 + +5.2.1. Voice Activity Detection + + The input signal is processed by a VAD (Voice Activity Detector) to + produce a measure of voice activity, and also spectral tilt and + signal-to-noise estimates, for each frame. The VAD uses a sequence + of half-band filterbanks to split the signal in four subbands: 0 - + Fs/16, Fs/16 - Fs/8, Fs/8 - Fs/4, and Fs/4 - Fs/2, where Fs is the + sampling frequency, that is, 8, 12, 16, or 24 kHz. The lowest + subband, from 0 - Fs/16 is high-pass filtered with a first-order MA + (Moving Average) filter (with transfer function H(z) = 1-z**(-1)) to + reduce the energy at the lowest frequencies. For each frame, the + signal energy per subband is computed. In each subband, a noise + level estimator tracks the background noise level and an SNR (Signal- + to-Noise Ratio) value is computed as the logarithm of the ratio of + energy to noise level. Using these intermediate variables, the + following parameters are calculated for use in other SILK modules: + + o Average SNR. The average of the subband SNR values. + + + + + +Valin, et al. Expires February 17, 2012 [Page 92] + +Internet-Draft Interactive Audio Codec August 2011 + + + o Smoothed subband SNRs. Temporally smoothed subband SNR values. + + o Speech activity level. Based on the average SNR and a weighted + average of the subband energies. + + o Spectral tilt. A weighted average of the subband SNRs, with + positive weights for the low subbands and negative weights for the + high subbands. + +5.2.2. High-Pass Filter + + The input signal is filtered by a high-pass filter to remove the + lowest part of the spectrum that contains little speech energy and + may contain background noise. This is a second order ARMA (Auto + Regressive Moving Average) filter with a cut-off frequency around + 70 Hz. + + In the future, a music detector may also be used to lower the cut-off + frequency when the input signal is detected to be music rather than + speech. + +5.2.3. Pitch Analysis + + The high-passed input signal is processed by the open loop pitch + estimator shown in Figure 12. + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 93] + +Internet-Draft Interactive Audio Codec August 2011 + + + +--------+ +----------+ + |2 x Down| |Time- | + +->|sampling|->|Correlator| | + | | | | | |4 + | +--------+ +----------+ \/ + | | 2 +-------+ + | | +-->|Speech |5 + +---------+ +--------+ | \/ | |Type |-> + |LPC | |Down | | +----------+ | | + +->|Analysis | +->|sample |-+------------->|Time- | +-------+ + | | | | |to 8 kHz| |Correlator|-----------> + | +---------+ | +--------+ |__________| 6 + | | | |3 + | \/ | \/ + | +---------+ | +----------+ + | |Whitening| | |Time- | + -+->|Filter |-+--------------------------->|Correlator|-----------> + 1 | | | | 7 + +---------+ +----------+ + + 1: Input signal + 2: Lag candidates from stage 1 + 3: Lag candidates from stage 2 + 4: Correlation threshold + 5: Voiced/unvoiced flag + 6: Pitch correlation + 7: Pitch lags + + + Block diagram of the pitch estimator. + + Figure 12 + + The pitch analysis finds a binary voiced/unvoiced classification, + and, for frames classified as voiced, four pitch lags per frame - one + for each 5 ms subframe - and a pitch correlation indicating the + periodicity of the signal. The input is first whitened using a + Linear Prediction (LP) whitening filter, where the coefficients are + computed through standard Linear Prediction Coding (LPC) analysis. + The order of the whitening filter is 16 for best results, but is + reduced to 12 for medium complexity and 8 for low complexity modes. + The whitened signal is analyzed to find pitch lags for which the time + correlation is high. The analysis consists of three stages for + reducing the complexity: + + o In the first stage, the whitened signal is downsampled to 4 kHz + (from 8 kHz) and the current frame is correlated to a signal + delayed by a range of lags, starting from a shortest lag + + + +Valin, et al. Expires February 17, 2012 [Page 94] + +Internet-Draft Interactive Audio Codec August 2011 + + + corresponding to 500 Hz, to a longest lag corresponding to 56 Hz. + + o The second stage operates on a 8 kHz signal ( downsampled from 12, + 16, or 24 kHz ) and measures time correlations only near the lags + corresponding to those that had sufficiently high correlations in + the first stage. The resulting correlations are adjusted for a + small bias towards short lags to avoid ending up with a multiple + of the true pitch lag. The highest adjusted correlation is + compared to a threshold depending on: + + * Whether the previous frame was classified as voiced + + * The speech activity level + + * The spectral tilt. + + If the threshold is exceeded, the current frame is classified as + voiced and the lag with the highest adjusted correlation is stored + for a final pitch analysis of the highest precision in the third + stage. + + o The last stage operates directly on the whitened input signal to + compute time correlations for each of the four subframes + independently in a narrow range around the lag with highest + correlation from the second stage. + +5.2.4. Noise Shaping Analysis + + The noise shaping analysis finds gains and filter coefficients used + in the prefilter and noise shaping quantizer. These parameters are + chosen such that they will fulfill several requirements: + + o Balancing quantization noise and bitrate. The quantization gains + determine the step size between reconstruction levels of the + excitation signal. Therefore, increasing the quantization gain + amplifies quantization noise, but also reduces the bitrate by + lowering the entropy of the quantization indices. + + o Spectral shaping of the quantization noise; the noise shaping + quantizer is capable of reducing quantization noise in some parts + of the spectrum at the cost of increased noise in other parts + without substantially changing the bitrate. By shaping the noise + such that it follows the signal spectrum, it becomes less audible. + In practice, best results are obtained by making the shape of the + noise spectrum slightly flatter than the signal spectrum. + + o De-emphasizing spectral valleys; by using different coefficients + in the analysis and synthesis part of the prefilter and noise + + + +Valin, et al. Expires February 17, 2012 [Page 95] + +Internet-Draft Interactive Audio Codec August 2011 + + + shaping quantizer, the levels of the spectral valleys can be + decreased relative to the levels of the spectral peaks such as + speech formants and harmonics. This reduces the entropy of the + signal, which is the difference between the coded signal and the + quantization noise, thus lowering the bitrate. + + o Matching the levels of the decoded speech formants to the levels + of the original speech formants; an adjustment gain and a first + order tilt coefficient are computed to compensate for the effect + of the noise shaping quantization on the level and spectral tilt. + + + + / \ ___ + | // \\ + | // \\ ____ + |_// \\___// \\ ____ + | / ___ \ / \\ // \\ + P |/ / \ \_/ \\_____// \\ + o | / \ ____ \ / \\ + w | / \___/ \ \___/ ____ \\___ 1 + e |/ \ / \ \ + r | \_____/ \ \__ 2 + | \ + | \___ 3 + | + +----------------------------------------> + Frequency + + 1: Input signal spectrum + 2: De-emphasized and level matched spectrum + 3: Quantization noise spectrum + + + Noise shaping and spectral de-emphasis illustration. + + Figure 13 + + Figure 13 shows an example of an input signal spectrum (1). After + de-emphasis and level matching, the spectrum has deeper valleys (2). + The quantization noise spectrum (3) more or less follows the input + signal spectrum, while having slightly less pronounced peaks. The + entropy, which provides a lower bound on the bitrate for encoding the + excitation signal, is proportional to the area between the de- + emphasized spectrum (2) and the quantization noise spectrum (3). + Without de-emphasis, the entropy is proportional to the area between + input spectrum (1) and quantization noise (3) - clearly higher. + + + + +Valin, et al. Expires February 17, 2012 [Page 96] + +Internet-Draft Interactive Audio Codec August 2011 + + + The transformation from input signal to de-emphasized signal can be + described as a filtering operation with a filter + + + -1 Wana(z) + H(z) = G * ( 1 - c_tilt * z ) * ------- + Wsyn(z), + + + having an adjustment gain G, a first order tilt adjustment filter + with tilt coefficient c_tilt, and where + + + 16 d + __ -k -L __ -k + Wana(z) = (1 - \ (a_ana(k) * z )*(1 - z * \ b_ana(k) * z ), + /_ /_ + k=1 k=-d + + + is the analysis part of the de-emphasis filter, consisting of the + short-term shaping filter with coefficients a_ana(k), and the long- + term shaping filter with coefficients b_ana(k) and pitch lag L. The + parameter d determines the number of long-term shaping filter taps. + + Similarly, but without the tilt adjustment, the synthesis part can be + written as + + + 16 d + __ -k -L __ -k + Wsyn(z) = (1 - \ (a_syn(k) * z )*(1 - z * \ b_syn(k) * z ). + /_ /_ + k=1 k=-d + + + All noise shaping parameters are computed and applied per subframe of + 5 milliseconds. First, an LPC analysis is performed on a windowed + signal block of 15 milliseconds. The signal block has a look-ahead + of 5 milliseconds relative to the current subframe, and the window is + an asymmetric sine window. The LPC analysis is done with the + autocorrelation method, with an order of 16 for best quality or 12 in + low complexity operation. The quantization gain is found as the + square-root of the residual energy from the LPC analysis, multiplied + by a value inversely proportional to the coding quality control + parameter and the pitch correlation. + + Next we find the two sets of short-term noise shaping coefficients + + + +Valin, et al. Expires February 17, 2012 [Page 97] + +Internet-Draft Interactive Audio Codec August 2011 + + + a_ana(k) and a_syn(k), by applying different amounts of bandwidth + expansion to the coefficients found in the LPC analysis. This + bandwidth expansion moves the roots of the LPC polynomial towards the + origin, using the formulas + + + k + a_ana(k) = a(k)*g_ana , and + + k + a_syn(k) = a(k)*g_syn , + + + where a(k) is the k'th LPC coefficient and the bandwidth expansion + factors g_ana and g_syn are calculated as + + + g_ana = 0.94 - 0.02*C, and + + g_syn = 0.94 + 0.02*C, + + + where C is the coding quality control parameter between 0 and 1. + Applying more bandwidth expansion to the analysis part than to the + synthesis part gives the desired de-emphasis of spectral valleys in + between formants. + + The long-term shaping is applied only during voiced frames. It uses + three filter taps, described by + + + b_ana = F_ana * [0.25, 0.5, 0.25], and + + b_syn = F_syn * [0.25, 0.5, 0.25]. + + + For unvoiced frames these coefficients are set to 0. The + multiplication factors F_ana and F_syn are chosen between 0 and 1, + depending on the coding quality control parameter, as well as the + calculated pitch correlation and smoothed subband SNR of the lowest + subband. By having F_ana less than F_syn, the pitch harmonics are + emphasized relative to the valleys in between the harmonics. + + The tilt coefficient c_tilt is for unvoiced frames chosen as + + + c_tilt = 0.4, and as + + + + +Valin, et al. Expires February 17, 2012 [Page 98] + +Internet-Draft Interactive Audio Codec August 2011 + + + c_tilt = 0.04 + 0.06 * C + + + for voiced frames, where C again is the coding quality control + parameter and is between 0 and 1. + + The adjustment gain G serves to correct any level mismatch between + original and decoded signal that might arise from the noise shaping + and de-emphasis. This gain is computed as the ratio of the + prediction gain of the short-term analysis and synthesis filter + coefficients. The prediction gain of an LPC synthesis filter is the + square-root of the output energy when the filter is excited by a + unit-energy impulse on the input. An efficient way to compute the + prediction gain is by first computing the reflection coefficients + from the LPC coefficients through the step-down algorithm, and + extracting the prediction gain from the reflection coefficients as + + + K + ___ 2 -0.5 + predGain = ( | | 1 - (r_k) ) , + k=1 + + + where r_k is the k'th reflection coefficient. + + Initial values for the quantization gains are computed as the square- + root of the residual energy of the LPC analysis, adjusted by the + coding quality control parameter. These quantization gains are later + adjusted based on the results of the prediction analysis. + +5.2.5. Prefilter + + In the prefilter the input signal is filtered using the spectral + valley de-emphasis filter coefficients from the noise shaping + analysis, see Section 5.2.4. By applying only the noise shaping + analysis filter to the input signal, it provides the input to the + noise shaping quantizer. + +5.2.6. Prediction Analysis + + The prediction analysis is performed in one of two ways depending on + how the pitch estimator classified the frame. The processing for + voiced and unvoiced speech are described in Section 5.2.6.1 and + Section 5.2.6.2, respectively. Inputs to this function include the + pre-whitened signal from the pitch estimator, see Section 5.2.3. + + + + + +Valin, et al. Expires February 17, 2012 [Page 99] + +Internet-Draft Interactive Audio Codec August 2011 + + +5.2.6.1. Voiced Speech + + For a frame of voiced speech the pitch pulses will remain dominant in + the pre-whitened input signal. Further whitening is desirable as it + leads to higher quality at the same available bitrate. To achieve + this, a Long-Term Prediction (LTP) analysis is carried out to + estimate the coefficients of a fifth order LTP filter for each of + four subframes. The LTP coefficients are used to find an LTP + residual signal with the simulated output signal as input to obtain + better modeling of the output signal. This LTP residual signal is + the input to an LPC analysis where the LPCs are estimated using Burgs + method, such that the residual energy is minimized. The estimated + LPCs are converted to a Line Spectral Frequency (LSF) vector, and + quantized as described in Section 5.2.7. After quantization, the + quantized LSF vector is converted to LPC coefficients and hence by + using these quantized coefficients the encoder remains fully + synchronized with the decoder. The LTP coefficients are quantized + using a method described in Section 5.2.8. The quantized LPC and LTP + coefficients are now used to filter the high-pass filtered input + signal and measure a residual energy for each of the four subframes. + +5.2.6.2. Unvoiced Speech + + For a speech signal that has been classified as unvoiced there is no + need for LTP filtering as it has already been determined that the + pre-whitened input signal is not periodic enough within the allowed + pitch period range for an LTP analysis to be worth-while the cost in + terms of complexity and rate. Therefore, the pre-whitened input + signal is discarded and instead the high-pass filtered input signal + is used for LPC analysis using Burgs method. The resulting LPC + coefficients are converted to an LSF vector, quantized as described + in the following section and transformed back to obtain quantized LPC + coefficients. The quantized LPC coefficients are used to filter the + high-pass filtered input signal and measure a residual energy for + each of the four subframes. + +5.2.7. LSF Quantization + + The purpose of quantization in general is to significantly lower the + bit rate at the cost of some introduced distortion. A higher rate + should always result in lower distortion, and lowering the rate will + generally lead to higher distortion. A commonly used but generally + sub-optimal approach is to use a quantization method with a constant + rate where only the error is minimized when quantizing. + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 100] + +Internet-Draft Interactive Audio Codec August 2011 + + +5.2.7.1. Rate-Distortion Optimization + + Instead, we minimize an objective function that consists of a + weighted sum of rate and distortion, and use a codebook with an + associated non-uniform rate table. Thus, we take into account that + the probability mass function for selecting the codebook entries are + by no means guaranteed to be uniform in our scenario. The advantage + of this approach is that it ensures that rarely used codebook vector + centroids, which are modeling statistical outliers in the training + set can be quantized with a low error but with a relatively high cost + in terms of a high rate. At the same time this approach also + provides the advantage that frequently used centroids are modeled + with low error and a relatively low rate. This approach will lead to + equal or lower distortion than the fixed rate codebook at any given + average rate, provided that the data is similar to the data used for + training the codebook. + +5.2.7.2. Error Mapping + + Instead of minimizing the error in the LSF domain, we map the errors + to better approximate spectral distortion by applying an individual + weight to each element in the error vector. The weight vectors are + calculated for each input vector using the Inverse Harmonic Mean + Weighting (IHMW) function proposed by Laroia et al., see + [laroia-icassp]. Consequently, we solve the following minimization + problem, i.e., + + + LSF_q = argmin { (LSF - c)' * W * (LSF - c) + mu * rate }, + c in C + + + where LSF_q is the quantized vector, LSF is the input vector to be + quantized, and c is the quantized LSF vector candidate taken from the + set C of all possible outcomes of the codebook. + +5.2.7.3. Multi-Stage Vector Codebook + + We arrange the codebook in a multiple stage structure to achieve a + quantizer that is both memory efficient and highly scalable in terms + of computational complexity, see e.g. [sinervo-norsig]. In the first + stage the input is the LSF vector to be quantized, and in any other + stage s > 1, the input is the quantization error from the previous + stage, see Figure 14. + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 101] + +Internet-Draft Interactive Audio Codec August 2011 + + + Stage 1: Stage 2: Stage S: + +----------+ +----------+ +----------+ + | c_{1,1} | | c_{2,1} | | c_{S,1} | + LSF +----------+ res_1 +----------+ res_{S-1} +----------+ + --->| c_{1,2} |------>| c_{2,2} |--> ... --->| c_{S,2} |---> + +----------+ +----------+ +----------+ res_S = + ... ... ... LSF-LSF_q + +----------+ +----------+ +----------+ + |c_{1,M1-1}| |c_{2,M2-1}| |c_{S,MS-1}| + +----------+ +----------+ +----------+ + | c_{1,M1} | | c_{2,M2} | | c_{S,MS} | + +----------+ +----------+ +----------+ + + + Multi-Stage LSF Vector Codebook Structure. + + Figure 14 + + By storing total of M codebook vectors, i.e., + + + S + __ + M = \ Ms, + /_ + s=1 + + + where M_s is the number of vectors in stage s, we obtain a total of + + + S + ___ + T = | | Ms + s=1 + + + possible combinations for generating the quantized vector. It is for + example possible to represent 2**36 uniquely combined vectors using + only 216 vectors in memory, as done in SILK for voiced speech at all + sample frequencies above 8 kHz. + +5.2.7.4. Survivor Based Codebook Search + + This number of possible combinations is far too high for a full + search to be carried out for each frame so for all stages but the + last, i.e., s smaller than S, only the best min( L, Ms ) centroids + are carried over to stage s+1. In each stage the objective function, + + + +Valin, et al. Expires February 17, 2012 [Page 102] + +Internet-Draft Interactive Audio Codec August 2011 + + + i.e., the weighted sum of accumulated bitrate and distortion, is + evaluated for each codebook vector entry and the results are sorted. + Only the best paths and the corresponding quantization errors are + considered in the next stage. In the last stage S the single best + path through the multistage codebook is determined. By varying the + maximum number of survivors from each stage to the next L, the + complexity can be adjusted in real-time at the cost of a potential + increase when evaluating the objective function for the resulting + quantized vector. This approach scales all the way between the two + extremes, L=1 being a greedy search, and the desirable but infeasible + full search, L=T/MS. In fact, a performance almost as good as what + can be achieved with the infeasible full search can be obtained at a + substantially lower complexity by using this approach, see e.g. + [leblanc-tsap]. + +5.2.7.5. LSF Stabilization + + If the input is stable, finding the best candidate will usually + result in the quantized vector also being stable, but due to the + multi-stage approach it could in theory happen that the best + quantization candidate is unstable and because of this there is a + need to explicitly ensure that the quantized vectors are stable. + Therefore we apply a LSF stabilization method which ensures that the + LSF parameters are within valid range, increasingly sorted, and have + minimum distances between each other and the border values that have + been pre-determined as the 0.01 percentile distance values from a + large training set. + +5.2.7.6. Off-Line Codebook Training + + The vectors and rate tables for the multi-stage codebook have been + trained by minimizing the average of the objective function for LSF + vectors from a large training set. + +5.2.8. LTP Quantization + + For voiced frames, the prediction analysis described in + Section 5.2.6.1 resulted in four sets (one set per subframe) of five + LTP coefficients, plus four weighting matrices. Also, the LTP + coefficients for each subframe are quantized using entropy + constrained vector quantization. A total of three vector codebooks + are available for quantization, with different rate-distortion trade- + offs. The three codebooks have 10, 20 and 40 vectors and average + rates of about 3, 4, and 5 bits per vector, respectively. + Consequently, the first codebook has larger average quantization + distortion at a lower rate, whereas the last codebook has smaller + average quantization distortion at a higher rate. Given the + weighting matrix W_ltp and LTP vector b, the weighted rate-distortion + + + +Valin, et al. Expires February 17, 2012 [Page 103] + +Internet-Draft Interactive Audio Codec August 2011 + + + measure for a codebook vector cb_i with rate r_i is give by + + + RD = u * (b - cb_i)' * W_ltp * (b - cb_i) + r_i, + + + where u is a fixed, heuristically-determined parameter balancing the + distortion and rate. Which codebook gives the best performance for a + given LTP vector depends on the weighting matrix for that LTP vector. + For example, for a low valued W_ltp, it is advantageous to use the + codebook with 10 vectors as it has a lower average rate. For a large + W_ltp, on the other hand, it is often better to use the codebook with + 40 vectors, as it is more likely to contain the best codebook vector. + The weighting matrix W_ltp depends mostly on two aspects of the input + signal. The first is the periodicity of the signal; the more + periodic the larger W_ltp. The second is the change in signal energy + in the current subframe, relative to the signal one pitch lag + earlier. A decaying energy leads to a larger W_ltp than an + increasing energy. Both aspects do not fluctuate very fast which + causes the W_ltp matrices for different subframes of one frame often + to be similar. As a result, one of the three codebooks typically + gives good performance for all subframes. Therefore the codebook + search for the subframe LTP vectors is constrained to only allow + codebook vectors to be chosen from the same codebook, resulting in a + rate reduction. + + To find the best codebook, each of the three vector codebooks is used + to quantize all subframe LTP vectors and produce a combined weighted + rate-distortion measure for each vector codebook and the vector + codebook with the lowest combined rate-distortion over all subframes + is chosen. The quantized LTP vectors are used in the noise shaping + quantizer, and the index of the codebook plus the four indices for + the four subframe codebook vectors are passed on to the range + encoder. + +5.2.9. Noise Shaping Quantizer + + The noise shaping quantizer independently shapes the signal and + coding noise spectra to obtain a perceptually higher quality at the + same bitrate. + + The prefilter output signal is multiplied with a compensation gain G + computed in the noise shaping analysis. Then the output of a + synthesis shaping filter is added, and the output of a prediction + filter is subtracted to create a residual signal. The residual + signal is multiplied by the inverse quantized quantization gain from + the noise shaping analysis, and input to a scalar quantizer. The + quantization indices of the scalar quantizer represent a signal of + + + +Valin, et al. Expires February 17, 2012 [Page 104] + +Internet-Draft Interactive Audio Codec August 2011 + + + pulses that is input to the pyramid range encoder. The scalar + quantizer also outputs a quantization signal, which is multiplied by + the quantized quantization gain from the noise shaping analysis to + create an excitation signal. The output of the prediction filter is + added to the excitation signal to form the quantized output signal + y(n). The quantized output signal y(n) is input to the synthesis + shaping and prediction filters. + +5.2.10. Range Encoder + + Range encoding is a well known method for entropy coding in which a + bitstream sequence is continually updated with every new symbol, + based on the probability for that symbol. It is similar to + arithmetic coding but rather than being restricted to generating + binary output symbols, it can generate symbols in any chosen number + base. In SILK all side information is range encoded. Each quantized + parameter has its own cumulative density function based on histograms + for the quantization indices obtained by running a training database. + +5.2.10.1. Bitstream Encoding Details + + TBD. + +5.3. CELT Encoder + + Copy from CELT draft. + +5.3.1. Pre-filter + + Inverse of the post-filter + +5.3.2. Forward MDCT + + The MDCT implementation has no special characteristics. The input is + a windowed signal (after pre-emphasis) of 2*N samples and the output + is N frequency-domain samples. A "low-overlap" window is used to + reduce the algorithmic delay. It is derived from a basic (full + overlap) window that is the same as the one used in the Vorbis codec: + + pi pi n + 1/2 2 + W(n) = [sin(-- * sin(-- * -------))] . + 2 2 L + + The low-overlap window is created by zero-padding the basic window + and inserting ones in the middle, such that the resulting window + still satisfies power complementarity. The MDCT is computed in + mdct_forward() (mdct.c), which includes the windowing operation and a + scaling of 2/N. + + + +Valin, et al. Expires February 17, 2012 [Page 105] + +Internet-Draft Interactive Audio Codec August 2011 + + +5.3.3. Bands and Normalization + + The MDCT output is divided into bands that are designed to match the + ear's critical bands for the smallest (2.5 ms) frame size. The + larger frame sizes use integer multiplies of the 2.5 ms layout. For + each band, the encoder computes the energy that will later be + encoded. Each band is then normalized by the square root of the + *unquantized* energy, such that each band now forms a unit vector X. + The energy and the normalization are computed by + compute_band_energies() and normalise_bands() (bands.c), + respectively. + +5.3.4. Energy Envelope Quantization + + It is important to quantize the energy with sufficient resolution + because any energy quantization error cannot be compensated for at a + later stage. Regardless of the resolution used for encoding the + shape of a band, it is perceptually important to preserve the energy + in each band. CELT uses a coarse-fine strategy for encoding the + energy in the base-2 log domain, as implemented in quant_bands.c + +5.3.4.1. Coarse energy quantization + + The coarse quantization of the energy uses a fixed resolution of 6 + dB. To minimize the bitrate, prediction is applied both in time + (using the previous frame) and in frequency (using the previous + bands). The prediction using the previous frame can be disabled, + creating an "intra" frame where the energy is coded without reference + to prior frames. An encoder is able to choose the mode used at will + based on both loss robustness and efficiency considerations. The 2-D + z-transform of the prediction filter is: + + -1 -1 + (1 - alpha*z_l )*(1 - z_b ) + A(z_l, z_b) = ----------------------------- + -1 + 1 - beta*z_b + + where b is the band index and l is the frame index. The prediction + coefficients applied depend on the frame size in use when not using + intra energy and are alpha=0, beta=4915/32768 when using intra + energy. The time-domain prediction is based on the final fine + quantization of the previous frame, while the frequency domain + (within the current frame) prediction is based on coarse quantization + only (because the fine quantization has not been computed yet). The + prediction is clamped internally so that fixed point implementations + with limited dynamic range do not suffer desynchronization. + Identical prediction clamping must be implemented in all encoders and + + + +Valin, et al. Expires February 17, 2012 [Page 106] + +Internet-Draft Interactive Audio Codec August 2011 + + + decoders. We approximate the ideal probability distribution of the + prediction error using a Laplace distribution with separate + parameters for each frame size in intra and inter-frame modes. The + coarse energy quantization is performed by quant_coarse_energy() and + quant_coarse_energy() (quant_bands.c). The encoding of the Laplace- + distributed values is implemented in ec_laplace_encode() (laplace.c). + +5.3.4.2. Fine energy quantization + + After the coarse energy quantization and encoding, the bit allocation + is computed (Section 4.3.3) and the number of bits to use for + refining the energy quantization is determined for each band. Let + B_i be the number of fine energy bits for band i; the refinement is + an integer f in the range [0,2**B_i-1]. The mapping between f and + the correction applied to the coarse energy is equal to (f+1/2)/ + 2**B_i - 1/2. Fine energy quantization is implemented in + quant_fine_energy() (quant_bands.c). + + If any bits are unused at the end of the encoding process, these bits + are used to increase the resolution of the fine energy encoding in + some bands. Priority is given to the bands for which the allocation + (Section 4.3.3) was rounded down. At the same level of priority, + lower bands are encoded first. Refinement bits are added until there + is no more room for fine energy or until each band has gained an + additional bit of precision or has the maximum fine energy precision. + This is implemented in quant_energy_finalise() (quant_bands.c). + +5.3.5. Spherical Vector Quantization + + CELT uses a Pyramid Vector Quantization (PVQ) [PVQ] codebook for + quantizing the details of the spectrum in each band that have not + been predicted by the pitch predictor. The PVQ codebook consists of + all sums of K signed pulses in a vector of N samples, where two + pulses at the same position are required to have the same sign. Thus + the codebook includes all integer codevectors y of N dimensions that + satisfy sum(abs(y(j))) = K. + + In bands where there are sufficient bits allocated the PVQ is used to + encode the unit vector that results from the normalization in + Section 5.3.3 directly. Given a PVQ codevector y, the unit vector X + is obtained as X = y/||y||, where ||.|| denotes the L2 norm. + +5.3.5.1. PVQ Search + + The search for the best codevector y is performed by alg_quant() + (vq.c). There are several possible approaches to the search with a + tradeoff between quality and complexity. The method used in the + reference implementation computes an initial codeword y1 by + + + +Valin, et al. Expires February 17, 2012 [Page 107] + +Internet-Draft Interactive Audio Codec August 2011 + + + projecting the residual signal R = X - p' onto the codebook pyramid + of K-1 pulses: + + y0 = round_towards_zero( (K-1) * R / sum(abs(R))) + + Depending on N, K and the input data, the initial codeword y0 may + contain from 0 to K-1 non-zero values. All the remaining pulses, + with the exception of the last one, are found iteratively with a + greedy search that minimizes the normalized correlation between y and + R: + + T + J = -R * y / ||y|| + + The search described above is considered to be a good trade-off + between quality and computational cost. However, there are other + possible ways to search the PVQ codebook and the implementers MAY use + any other search methods. + +5.3.5.2. Index Encoding + + The best PVQ codeword is encoded as a uniformly-distributed integer + value by encode_pulses() (cwrs.c). The codeword is converted from a + unique index in the same way as specified in [PVQ]. The indexing is + based on the calculation of V(N,K) (denoted N(L,K) in [PVQ]), which + is the number of possible combinations of K pulses in N samples. + +5.3.6. Stereo support + + When encoding a stereo stream, some parameters are shared across the + left and right channels, while others are transmitted separately for + each channel, or jointly encoded. Only one copy of the flags for the + features, transients and pitch (pitch period and filter parameters) + are transmitted. The coarse and fine energy parameters are + transmitted separately for each channel. Both the coarse energy and + fine energy (including the remaining fine bits at the end of the + stream) have the left and right bands interleaved in the stream, with + the left band encoded first. + + The main difference between mono and stereo coding is the PVQ coding + of the normalized vectors. In stereo mode, a normalized mid-side + (M-S) encoding is used. Let L and R be the normalized vector of a + certain band for the left and right channels, respectively. The mid + and side vectors are computed as M=L+R and S=L-R and no longer have + unit norm. + + From M and S, an angular parameter theta=2/pi*atan2(||S||, ||M||) is + computed. The theta parameter is converted to a Q14 fixed-point + + + +Valin, et al. Expires February 17, 2012 [Page 108] + +Internet-Draft Interactive Audio Codec August 2011 + + + parameter itheta, which is quantized on a scale from 0 to 1 with an + interval of 2**(-qb), where qb is based the number of bits allocated + to the band. From here on, the value of itheta MUST be treated in a + bit-exact manner since both the encoder and decoder rely on it to + infer the bit allocation. + + Let m=M/||M|| and s=S/||S||; m and s are separately encoded with the + PVQ encoder described in Section 5.3.5. The number of bits allocated + to m and s depends on the value of itheta. + +5.3.7. Synthesis + + After all the quantization is completed, the quantized energy is used + along with the quantized normalized band data to resynthesize the + MDCT spectrum. The inverse MDCT (Section 4.3.7) and the weighted + overlap-add are applied and the signal is stored in the "synthesis + buffer". The encoder MAY omit this step of the processing if it does + not need the decoded output. + +5.3.8. Variable Bitrate (VBR) + + Each CELT frame can be encoded in a different number of octets, + making it possible to vary the bitrate at will. This property can be + used to implement source-controlled variable bitrate (VBR). Support + for VBR is OPTIONAL for the encoder, but a decoder MUST be prepared + to decode a stream that changes its bitrate dynamically. The method + used to vary the bitrate in VBR mode is left to the implementer, as + long as each frame can be decoded by the reference decoder. + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 109] + +Internet-Draft Interactive Audio Codec August 2011 + + +6. Conformance + + It is the intention to allow the greatest possible choice of freedom + in implementing the specification. For this reason, outside of a few + exceptions noted in this section, conformance is defined through the + reference implementation of the decoder provided in Appendix A. + Although this document includes an English description of the codec, + should the description contradict the source code of the reference + implementation, the latter shall take precedence. + + Compliance with this specification means that a decoder's output MUST + be within the thresholds specified by the opus_compare.c tool in + Appendix B compared to the reference implementation. + + To complement the Opus specification, the "Opus Custom" codec is + defined to handle special sampling rates and frame rates that are not + supported by the main Opus specification. Use of Opus Custom is + discouraged for all but very special applications for which a frame + size different from 2.5, 5, 10, 20 ms is needed (for either + complexity or latency reasons). Such applications will not be + compatible with the "main" Opus codec. In Opus Custom operation, + only the CELT later is available, which is available using the celt_* + function calls in celt.h. + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 110] + +Internet-Draft Interactive Audio Codec August 2011 + + +7. Security Considerations + + The codec needs to take appropriate security considerations into + account, as outlined in [DOS] and [SECGUIDE]. It is extremely + important for the decoder to be robust against malicious payloads. + Malicious payloads must not cause the decoder to overrun its + allocated memory or to take an excessive amount of resources to + decode. Although problems in encoders are typically rarer, the same + applies to the encoder. Malicious audio stream must not cause the + encoder to misbehave because this would allow an attacker to attack + transcoding gateways. + + The reference implementation contains no known buffer overflow or + cases where a specially crafted packet or audio segment could cause a + significant increase in CPU load. However, on certain CPU + architectures where denormalized floating-point operations are much + slower than normal floating-point operations it is possible for some + audio content (e.g., silence or near-silence) to cause such an + increase in CPU load. Denormals can be introduced by reordering + operations in the compiler and depend on the target architecture, so + it is difficult to guarantee an implementation avoids them. For such + architectures, it is RECOMMENDED that one add very small floating- + point offsets to prevent significant numbers of denormalized + operations or to configure the hardware to treat denormals as zero + (DAZ). No such issue exists for the fixed-point reference + implementation. + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 111] + +Internet-Draft Interactive Audio Codec August 2011 + + +8. IANA Considerations + + This document has no actions for IANA. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 112] + +Internet-Draft Interactive Audio Codec August 2011 + + +9. Acknowledgments + + Thanks to all other developers, including Raymond Chen, Soeren Skak + Jensen, Gregory Maxwell, Christopher Montgomery, and Karsten Vandborg + Soerensen. We would also like to thank Igor Dyakonov, Jan Skoglund + for their help with subjective testing of the Opus codec. Thanks to + John Ridges, Keith Yan and many others on the Opus and CELT mailing + lists for their bug reports and feeback. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 113] + +Internet-Draft Interactive Audio Codec August 2011 + + +10. Informative References + + [SILK] Vos, K., Jensen, S., and K. Soerensen, "SILK Speech + Codec", draft-vos-silk-01 (work in progress), March 2010. + + [laroia-icassp] + Laroia, R., Phamdo, N., and N. Farvardin, "Robust and + Efficient Quantization of Speech LSP Parameters Using + Structured Vector Quantization", ICASSP-1991, Proc. IEEE + Int. Conf. Acoust., Speech, Signal Processing, pp. 641- + 644, October 1991. + + [sinervo-norsig] + Sinervo, U., Nurminen, J., Heikkinen, A., and J. Saarinen, + "Evaluation of Split and Multistage Techniques in LSF + Quantization", NORSIG-2001, Norsk symposium i + signalbehandling, Trondheim, Norge, October 2001. + + [leblanc-tsap] + LeBlanc, W., Bhattacharya, B., Mahmoud, S., and V. + Cuperman, "Efficient Search and Design Procedures for + Robust Multi-Stage VQ of LPC Parameters for 4 kb/s Speech + Coding", IEEE Transactions on Speech and Audio Processing, + Vol. 1, No. 4, October 1993. + + [CELT] Valin, J-M., Terriberry, T., Maxwell, G., and C. + Montgomery, "Constrained-Energy Lapped Transform (CELT) + Codec", draft-valin-celt-codec-02 (work in progress), + July 2010. + + [DOS] Handley, M., Rescorla, E., and IAB, "Internet Denial-of- + Service Considerations", RFC 4732, December 2006. + + [SECGUIDE] + Rescorla, E. and B. Korver, "Guidelines for Writing RFC + Text on Security Considerations", BCP 72, RFC 3552, + July 2003. + + [range-coding] + Nigel, G. and N. Martin, "Range encoding: An algorithm for + removing redundancy from a digitised message", Proc. + Institution of Electronic and Radio Engineers + International Conference on Video and Data Recording , + 1979. + + [coding-thesis] + Pasco, R., "Source coding algorithms for fast data + compression", Ph.D. thesis Dept. of Electrical + + + +Valin, et al. Expires February 17, 2012 [Page 114] + +Internet-Draft Interactive Audio Codec August 2011 + + + Engineering, Stanford University, May 1976. + + [PVQ] Fischer, T., "A Pyramid Vector Quantizer", IEEE Trans. on + Information Theory, Vol. 32 pp. 568-583, July 1986. + + [1] + + [2] + + [3] + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 115] + +Internet-Draft Interactive Audio Codec August 2011 + + +Appendix A. Reference Implementation + + This appendix contains the complete source code for the reference + implementation of the Opus codec written in C. This implementation + can be compiled for either floating-point or fixed-point + architectures. + + The implementation can be compiled with either a C89 or a C99 + compiler. It is reasonably optimized for most platforms such that + only architecture-specific optimizations are likely to be useful. + The FFT used is a slightly modified version of the KISS-FFT package, + but it is easy to substitute any other FFT library. + +A.1. Extracting the source + + The complete source code can be extracted from this draft, by running + the following command line: + + o cat draft-ietf-codec-opus.txt | grep '^\ \ \ ###' | sed + 's/\s\s\s###//' | base64 -d > opus_source.tar.gz + + o tar xzvf opus_source.tar.gz + + o cd opus_source + + o make + +A.2. Development Versions + + The current development version of the source code is available in a + Git repository [3]. Development snapshots are provided at + . + +A.3. Base64-encoded source code + + ###H4sIALY3S04AA+w8a3faSLL5Gv2KnuzZBAjEgLHjiR/3YCxs3cHgBRxPdu4cVhaN0U + ###RIrCTiOJP891vV3ZK6JYGxzczcPTecGQdJXY+uqq5Xt/Dmi2AUeAvfolvP/qBPFT5v + ###d3bw39rbnar8b/R5Vqvt1uu729u7u7vPqrVafXvnGdn5oxiSP4sgNH1Cnv02Wz3uvu + ###f/oR9P0n+rd/HB6J5unAYqeLfRWKb/3Z23NdR/tQGDqjswrlavv60/I9WNc5Lz+X+u + ###/5Y3v/Ptm2lI6qCVSh3WHvnZnk/f9PybMhl8vJvTMulZoRnYVlkjOZ//pqZbOTd9i7 + ###w3Hdstk6E988LpHTl+Q4bU9+1r+HOXD9saGP1emZjumAAI9YnluSFALELPDzStT8d2 + ###wK9tz2XDFgEltku4xbI717Zr+ndk4vmzoExu7XBKPJ/96y1CbeaN7YltmYgACPmUzK + ###k/s8OQjsnc9z7ZY/gSTs0Q/lBA4jjere3eICNjG4ECDYFmNHynaRWichQQbxKxYnlj + ###GAbWRHwamsAi4jOvvU/4SMhYc73QtkCg4dQOiAOYEEFCis1H5QPIWY5pz6j/Jo8+0J + ###HmH9GHiY0XwNOmWSB8WtrYsxYz6oZmpJYtkDhX4MwMqW+bTpBIl6kEUcqsw2yGZ8aA + ###DHrt4VWzrxP4ftHvvTdO9BNy/IEMz3SC/qhvnJ4NyVmvc6L3B6TZPYG73WHfOL4c9v + ###oD7V//ag4A9NUr9qjZ/UD0ny/6+mBAen1inF90DEAH+PvN7tDQB2VidFudyxPwcmUC + ###KEi3N9Q6xrkxhGFDsEQkmwUjvTY51/utM7hsHhsdY/iB0Wsbwy7Savf6WpNcNPtDo3 + + + +Valin, et al. Expires February 17, 2012 [Page 116] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###XZafbJxWX/ojfQCU7sxBi0Ok3jXD95Q4A8kCT6e707JIOzZqfDKLZ7l92T5tDodYFt + ###TZ4gOdZJx2ged3BQn03wxOjrrSHOJPnWArEBax1YsRd6y4Avmv6zDvNo9j+UURSAc6 + ###D/4xIGwUNy0jxvnsK0CllpEEkaGiikddnXz5FbEMHg8ngwNIaXQ52c9nonTMYDvf/e + ###aOmDfdLpDZigLgd6GSgMm0gYUYCU4DGMPb4cGExeRneo9/uXFzjjIij3CgQCPDYB9I + ###QJFgSBUwXZ9PofAKmGMmByL5OrMx3u91GUTFJNFMEAJNYaEmkY0AMBDqU5al39tGOc + ###6t2Wjk97iOXKGOhFUJMBnJ0iSiR71QSal2zKqB3gin81BlpkrmWmQ2K0SfPkvYFsi8 + ###Gg9oEhTISJrHUmxA0WryXetmAV0ePuMo8rHC3p2OCZ6PgNaToOYeMCWM0B9T/BzU24 + ###Q5Lyh4Vgcf0btcD5eWyFOsiAGbsWsWij1X9NwSMUifYYL0piL/pUJ0qEB9Me50Q34E + ###PJJpwo2YwXrZAutRkMPnPNGUVWFHMqg8SSx1zcc2qhGRBNDrhloHsHWkarGqNJUHcM + ###tykaEPABUZ0SLhawyzEwCGZJJvCAcF0E3iS8RT1H1haTmfs2GqGPFuNy2wkCxj96w6 + ###zH7oBLAYc1gCXMViS61g+vIEI0h+iLWFAYMO96ii4aIDQWMyCICNA35JHhRXW/r149 + ###Or5oOR71gfFFkwIMWSvA5McXLZlq76oLvpNHhIdFGS0vzJBHhBktLZRHhRlNiTPk0X + ###FGUwINeXyg0ZJpkidEGk2EGvLEUKO4AAIOgl7fkYDOTR98i3NHbnzThWUsHL/sBogJ + ###Ls2ibkC1hTtGhwXj5gAljY+XegwIRIAApwp+FLwcuDDXdDT6yXQWsY8jIQ1CdIjzhT + ###/3AnRHrnMHq5V7UkaW0M9zCHsBcEk/W85iTAMNAx04LoU2klEiIlyLgGi6d8DaDNyt + ###BW408lowQEs94a4NHyIChL6FMBZ49BPLuAeURwDjok+gUAwpOmxwkxCmhCQMfdjmnG + ###DEcoJ32jQM5++2tsYmjPdN6yMgsmk4eeP5N1v23N+q1X98u6X91YWf+Mj1f+Bbf0gP + ###6OH9n3q13vje//kzPmn94/Uba7M07un/NEDfTP+17Wqj8Rb1v12D4d/7P3/CZ6tE0k + ###WJ1AEibQ9CgCgWlIiC7Zwrkc+B3081gZin/8mDZ++9gJS2tK0SAmygnwNYNtDSASxJ + ###VwcuntzYARxP7O3kcvHw9s4TGYk6PIBmM00eQLSJPg+g2USrB9BsptsDiDbX8MFG6E + ###Z6PoBoE20fQLOBzg/HsonmD9PaBvo/gGcDLSDA8qTUHLyh9jd7MqYTctZ8r49gEm3j + ###dHQGN12W7JIXsFgn9s2b6Qvtb1CC2xNNesYCNDxBHC4i6V1cDkYgwgHIU/sb3LFdqt + ###wkLxbuR9e7dRN0QADcgjWFyFfiGUDoU9/3/AKk7YR9K2q/41Qx6YUCXgZgjxECXEfw + ###y96v5JD8Lrr7L4KFZUHm/iJq97+wXUj/7TG42xvmTZIn14vJBNsWnkeCmek4MgwvHT + ###gjyX3L8/3FHN08smvOkic+/fcC6gp0fcSezR2WptNxlg2Wwye3Z3TmgXMF6h6PJ2QC + ###OTwA4oBv+/jXnpAC44MckSr5+pUzRQ5I5W1RoIG4sPDdWMyCbQZNnYCqo1TpVdjlr/ + ###vatxyl3NBwBGUINkoEQOGTZ49RM88jmo59jWPJi5QdcANrX/7zn2j5z8V8K5PFly+A + ###J7YE8QDp/9WZyPfPX/HJy/9H1MWkx99UHbA6/39b32ns8PqvAd93apD/N3Z3v+f/f8 + ###onL/+vfs//v+f/3/P/7/n/9/z//1z+f8ATwTfTI+XeGPLAzD3by9yCNFy598KiTsgI + ###KQVGnAEoTzCndi31HjhjGqi3Atv5OGpeGKxKgfgy9E03YL6HhOa1QwPWLkdfAdmscP + ###rmArglHBlp2z4mwp6zmLkEfJhwSDN7PHYoKbCkHbL0ICjCI58GU88Z4w4CJQFFP6eC + ###kuldAO6KBjbz+wWQJ9QdMBGaOC2OuoiRSil4sBpiTI6ugctbexxORzHJ4JdalRc/z5 + ###/XapDJlAn/C3PuHh9Ujs6PESE8bKgPz/HhlXhY57fr0cMrfDiIn/6oPh2wx232FOqT + ###DLNMjvcxu11l6OAT8cMKJ6yCbsGVc8JVlbDK8+4qnre3V/KMJnFufgRlLSAE4z7LHU + ###Qq9+YVRCbHvnH51nMDsooQTKXAohjuS7uUP7nGhMGC+i/gWQiYFVw4zh25pbaPlaY1 + ###hQzFgvqIBrJKbdfB0piJCQmxWtcWdW5UnhXs19vFl5UGq8hwgLwcWEUW2F8oA4VKzX + ###WhwIsw4D20fd21BjDmGPkvE1xg8p39eCxQ3I9Ig2bYsjkFAroghiAF8jKNkhQFikkB + ###AKMaNJ5AlT/NQB2KSacfCGxpNmE83srOPJ71viy2CPcX6k0KPRCZmESx+DpN8HVWIi + ###BqCUZUvxFl27VDGWUJivgyE2A74P9GLPErcz53RHYYaQarZlJiAgasnPGW3hnGBKOp + ###JsqBulzRVDkj0X1NqIHEMiFHpI4tguj6oJZRT/ey09mPASVeyQGv4JsXkI+0WG4wet + ###8zLhCfPOwoO6wJ4a13D6V2QH44JHuwJsnLl4Rf1erq5a5yWW8olw2EXUKE3QW3HNCw + ###gMqBdZ+/bGLjEdaD1Qcs3pCSgdH5idBIH1tPWxcMkvP6XGH0+UOXRRBWjiK7GXmTSc + ###BYWm7tCVRkUglUDq7M4kgWL44CIBSZXyoGMDQLnizdaLRk1aViQQVOcVQUemN4WT9t + ###FNsxZ1a6jL5KMG28347uSLoyYMEKHgrxVMqgsGgCGObztYWfGw+cPLbhwH8L5GAmkC + ###6ZCyfkdoKHGKB2o34QmYqC+43bEuxCFkKUjzyTFXBG1IFcDw7IjAIT+459tGWFHhdV + ###HtTM/BzRGajAYi3mAtnuUqC9JTCQVNk+HefArSA0N+8czxyjZY5mgTqnei7EtR2mp5 + ###9A7CwlY32kYccLggsK1TaUmzc0AsoFsDzk/rMd3mWp1HIhFgE13GNIidp6Kw2xDOBk + ###+HPOPFYAtI77DwA4uxhZixDW4ejsSw5ADDG9u/bt8Yjlr96Ip3T/qDXS0yYHB6TWSB + + + +Valin, et al. 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Expires February 17, 2012 [Page 129] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###bG8WTY54UWoOB+Db9HfdwRd5MJPsdMU7NJdI4rYTSZjWOU95hjdSVeITFQ81rbXrC6 + ###DrId0bVa5jz2Xk22B1XHsAyJDKzjVTnEuLeNb6YrAO+XmHpL57LRVSyIDe0SATqwuJ + ###Rh1eW1uzu8ugIUz2aDLi9b/eQyxoGYxv1+gXYkyFUdAtlD1osTWpyGA+IiayB/Z9vh + ###y9nZGTBZj+8KrvK1vBW2riky81XKzuxskyth33BgkYqIeYeAiFopHp1Mh2Mgp1FTbM + ###igQ9cXSZeXyD5Om87tNCbagEqBE2AcXTNLXEcTGLuot3rNd2jcLcWDXhthi6ZeEjMh + ###3a6Tfh+pgiBg1IdXEo4nFCKoKUDqKe9JkHJqEdBDxaufo37SY/RAQdAFBSDcyBufAR + ###bAwgYd+H6h5v7riyG6UyBEq7O80zxB1aU3jOWFSZZbOCNA6+Ba3dl4DCzXvxUqC88d + ###0tbGOWhhvTYhsmCABsCvJjweLJOy8wfHGBh7zgMdZ/FEYiy6wC25IY0H5wLQwcAUnC + ###+ErkX8PABdsBNPr+OYy0yHI8msVhOoxImdPL7jLEGEUhkt1rMJzR0uIZoTk5mbA20R + ###x94J243+Z0VqF/oTWEN6HpoRgb3+xXrmGYgpkAXIuELqQvmCPwcrTd0h7uNAzUVdP4 + ###J9Cmqno+gcAMOTye1VZ9if5Mymm6nAc0fM75SQENVhu3EdJVNHC8OBm+lApsrZNBzg + ###DWpcQEFuwT4K1ekuEbHnrktlNp9+2UzHQTCxByLRALSRRycFsXAV26j9+yj3hIGGHl + ###S2mTUz0XlS0g+gYC5uJsVCmCQrnXHqBBzqyEIwsru4oLynN5PUANPEf4by/hlqDpoV + ###erhFZF7pyZHGleQsGiPnkDihFUfAEisHXneeTWmo5ephsJcnFmXBs2XaOCW0eZzMkm + ###mELka4bl1Fl7y9JM7ricV1gg1zN1542ZV/xTh3IfRIukT96+h2gqhN+ridA+kmdamL + ###SPD+DcwQnrVeIV45XwG8+n3zFGeMO29EhXksUfJmNJwA735GuQEqAPKsv5KJ+yuGjV + ###bZRSNmSNQKKCIHb45+LIhXILj8/y1j6U26UZ8TeIbFIutFf6LxTUkLHNk2qoOp4X28 + ###yv+/9eOy/7Yvk8mkfXY2bZ/PcFP5tW0ssP/WwmYD7b9hGNbXgjUoFzSrtbVH++/3+K + ###wWM9bcGlpz62XvbTS+9F4OUUShyEF73g7IMSqLmvskHoMOR3a+P4tx17bsesWvNO1K + ###c6qUwPcz77oxubN59yGQMUy8+HkoM+8DWHm9Z2ThfYZMdl8Tb9q+C7DuZeF1mncRsZ + ###SB123f1X09+uVw770wxZoW3qfe/Wy8toH3qXc/E2/Kvgtg7mHhdZp3kd53NfC6rbtP + ###vTvad3ONuzRsS5p3F9p2Adgc6664m0+hmF4fHB+39/dP2j9+ODnG6/nCcJZ+rmPoHh + ###xyRHOMPb5V6GBCQfj2gkJg6YDmv+pC26lCmOBDLtwrF3SKQ7Um6mkbdVVY7KKJ1JI5 + ###KCNdkDjrD1Gw3o74FhwIEVEdf6YspL9nQI43M4+STe+LetYd3WzytTxph9aoPhMRXv + ###ZuRv1oEEmr5VXUHQ8ngAVGjjln6SNiVKF0umAZv4uxggtXOuUCfl54V5wJhEvsH/z6 + ###6uDngtf1yhjSzPOxBG7FvbPkBteWIV2pAtCgcHfRnxVKrYC8RVsK0uk6YSeLXcyWVe + ###AsLKrBFzJKmFfxOqrU/vujt1QS2ox8WQrv4HGRnVevTo7MArJIiYoUc+4wavrhTQmi + ###nbbKHu+8fQfz8pUO+6azhMGrNrCPp5PUq3cnvxy8oncUDU8/BiHW/vDueHcHBFXwNA + ###UKJlNFAiUcPIUFjUg6Oj/eTseOWkWtwfu/T+Wi9LtXuPJX8OoCpyJiiMDoK2OMyr8y + ###9oFm+mFCD/HapIKBH4SRAAyO8Z+GkbhgjBHGFwpwVqg6UN2dh6u7nbvhmu5v4oIx1j + ###Dm4FqfS9ef3hfuRttymIcygLobiQnUHMxf/hN5buc9TNiyN/FSPehyDwRg8ZvLbVr4 + ###dRk/s2AiC+Y0D1JCNH1TvvSN7mIe1ZaEhInTC3LSVAqFS04YuwpfSoGX7pAQPt0yyB + ###QTJAbiw7+6TdUXLLnpWdTmT6ps4qnCX1RUPj1RWcoY4ooBYsMUunBl3FL5cNXoQ7v8 + ###MjFeSi6QHKCpZ7Rli8ZsW8xvOW3pl4vbygjPTFtqNorfZY+aNRpMlUjK1LS/mW7TaD + ###Qj1Bc362hVdNRuNdNV9qElV3E8BDFWAFIynMK2gJ0solJgkiojYE0xQPgVaTBg8SJk + ###6FdizCQ5z3XZxCsZZcebziHKSsu8hktLNJxYSAo0Nt3jZMo+s/9z5yXGETg6eker7n + ###LiSAujIuA48U3MaW6KxyZ1VDwmVhJ3f9rbfd0+Ag15/83RL+2jd9i2bDr9DgZ5OMI+ + ###EU+AZoKopgHizFhm/kMfnuD3bCs8P0tihs4tlohiiSwmZzrBKAnmUFOcqpTEyN1Dji + ###zCubIczpU5OFecOFcW4DxHHs3BWYiIkhASCwomomAab1QXCYAhZMSj5J7CbCHKlWVR + ###rrhRrmRRrkiUs0QmFqeL10hmMT16nhEIzdSPV4t6Cqm91u7RcWF0EU1iULNNrbZIQU + ###MKuPUi1beM+6sKf11plCjeM2jiXdiFiPqUgT3bAGwvv6aBSTIwGmARNK8PDBUASCWk + ###aKK4CMFsbbN9ozZeh2gf7aPugxnoUcnBdQlGQzopwd4ZQL995WzTwLh9ddWexNOgPZ + ###oUkJzy+SJcrXqApateCsuiWWelceb74j7KfAwLqd2rb6C5AMlsVY3pHDwRNy3Apfi7 + ###PGt3MUrMTVlAh7mDKw38eQK1Ktu4ejo6sKkKJGYBjSYWcEgC2WBotihWN7mgqXYt1q + ###YbPUAkvgok2WfTqpQsVUnEW4eqlgIk533KZIIz/482mv8P+rjOf6563emDOf//x6Lz + ###n2qjFlTF+U+zGlL859paLXw8//ken/vHf16/b/xnLPNnOTAiW+fjbYDH2wCPtwEebw + ###P8EbcBQP6SixD8PwLFkQKNvX0FHaCvetaRFAMRicUOV+vqJAQUIzqgGeLe7WrIUxxn + ###3/VwfLniHVBOnVm/x86rGFrgc9y/xYOcCKUECJPraIy5ixHKqD87x3k/Avk2vQUhQ6 + + + +Valin, et al. Expires February 17, 2012 [Page 130] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###H4e9gIe+jzLEZ8Qfb0o27Mnl0/D8cdeIbFCkKUTwyHJvLY2nl34JfZzxaBoKdzRE7o + ###mDb5Kp5MboU4Qm9cPKFiP6fZyOvNRn0S8uycRSKpcEXrEZS7jvt927Mc0Yg/x+Pba8 + ###TZl0iDhOyfD+nCAlIbaJ3gMRVQjnBOBpNRgq6f6H7qe/tRZwyy03sJ4IFAf6OVwjUw + ###QK79/bfv9n7kKxKg0RquuSS30bsS1q/huAeicnAuj9dwt0C3HwYgRTGcBdFThfgmgw + ###42aJweip85p2iOs6H0uZ10NB3okDGRjEztyQiqej8DXYy94iV8/1g/TZeYXie9Xj+W + ###x31GeEP4F28Ee6hHtmG3eTkbbT59iq11MeYcPk0GybRgvPeK/bIRmEdi5W9y1EVVr9 + ###uPo3GqInqvrRZRjyEvQDzWE1xN4yVpTQGp6qvQAvD+5EJwKDtCR+NxdIvaid2agCPi + ###PKbQzRx4FpOB4yGoKtJlIxsukj3puc+Y+a0fjco6SqL4CuTsxdlOdqLupe5lYTCUHO + ###VTl0ETIsUJJghOFXSt5AYqUY89wQtElQkxdNJN0CERKBSshn6WErKxb0cKzT53I8qj + ###3+JXfVz7P3IFaHejyQPtAhfs/9aajVrq/ncjaDzu/77Lx97/7fL9b29vnFx6sJLsRh + ###iYyHszHA29LVi9Lnvezgms1udRZRCD6HkF+iJoItuPG7vHjd3jxu5xY/e4sTM3dj/H + ###Y7pqG6wEnqnV77852jlp7+4cm7q99RBqtx7w87RYfHI08A4G07jvvYMJn8yucF7Dfm + ###MyHE+8QjwZxV2Y7aACvjs4OGAFcjzsRB18Usdw0cMBqGK4B0NgdEVPeAwOOSD5xMMt + ###lzcBebPineCWLmbpvIu3v7uTMt8bREkrhBtemkFgtGvdpR1t0geSeVO8FkPbPYnrII + ###57dGG6e0GXGRHU/rsP+joMZitCWJ0YpCi/t9Bj9Gk0AFOhG6PzerGI1XYRLMJxAva6 + ###kdrR4stRMorpvhQA72BDM9hO9HCzjbCSCYtleowgxIZc1eK7pgldbCJyCST2h+PpbA + ###Byt89Xog6Oj7zdjQ0in1oNJ/I8ibqoL0hjRs8y/zkrI7Q+faeR5K9nouGz5IYRxAGG + ###nawXsekB+hnDvrU7lfgAx3wYJDcVunw9uZ1M4ys1iphiCu9uCyaSRgaKDNCLpwCFFm + ###gakxFeFcB7qkyIiYE30Iye3cIuBTbMf8No3UB4+MWggMDC0IClrhAa7ul5KQKk8con + ###boGAe1BbFRPvCZbDDT9SDzCcDinIAl3yMqjCREElIZqIlXLyAqvif0/Ih5Ki68tkqc + ###RPN7636XgPuykReJwLMB6IQ6r30J/fZmxnUIOHKCii9WZjyYiKzExFprRc2sV1YsoC + ###9gazvNIb/XOfwNL15m53SDc46L40wtLAVy4o26yyOngFA4IvO4Fh1YUvcTzg+3ICed + ###hwThHqVE5ppSQEG0B8YmFsUY7UChpiblWYCXmab0xbMmJMlA/w9AJQnA4RRjw4j3ju + ###XxHfDEfT5CqZCDOMRK1XTjOZvLxNk5MuOgIav5DSaUKYXGM8Udwnn52VdZwLYEGoci + ###m1JpRXgBRqXZ0xam0cwqLSvxI05C49aUPXdzd+bR8ffXi/u/ckUHKeX2zoF7pKG8/T + ###uZ6uYD7eoOLCzPNki6mzrUATh4YwGHjIzGwL356KQ/uCPLXXI+z7fzaEHfh6hV8ODp + ###t1yg2tHrX5mf/0ibJ6bd1cXcnQJttPnwIa4larmqm6OZ7LNIUAxO9PnzyRl1uvrtrd + ###z9MJ7ImTWljAn1C0155MCs+5uL/59MkXF4q1MIsiPDNQ1AR4+gQm1i/JoBZSpAMUfJ + ###MYRDEwGzNdSkw+fcISbczzRJkg5cVdsbZNHCJWGG6fAHM+cRDl6RNFFSnizvpTJMoT + ###WtYH0/PxJuD7pB1NruDP71C+h0Xg+5Mz2AiMuAz+/AKSD/5oatIbjwgmvDCkz067/e + ###Phh912Gw/4RfpBvkR73u2yIRX9HuE36CRiR6L0A+zJX66jMYXOePZqiNSTVEsviQXf + ###lPUFf+WZWfc9rS1C3KZEhnOBeWb4JaguED6ZIX4ip4PJdVP/yRMOF1NQbjj41DdcQV + ###QDpkb4zbweXPYfMyXkQ7SxwP7TbNSaaftPWH+8//ldPi77z1r63J72+Psw+V54Jm+o + ###w6CEdeMC6Oy3vnd0jGkypiLokNePbuPxirdDGiZtHHiKCOsF10VQw0FfnIJ4dHIjdE + ###4QYFEPtwWkqaGWJi6d/mlsTViJIElbU7DygBdP729sCrNo/O+wNu18OPkJ9v7zzEkI + ###5363Sh3VENg9r5WiOQmrL75XKjqVazmiHt3h/qjbckSHq3e6QOqyHJEF5R43SG3LEU + ###K59xVSbTkiZL7mDqlhOSKr4FdfIl0mxTNZio6O28cf3r0DPA1LkfVQKlS7H45Pjt7K + ###F+h3qhNCwyQfXllZntOJobdwig3OSTc3wwcmw8wjUBJIg6XDyL03J971OBqBxKTddZ + ###eSQ4OahRag3hB3UTDFrwde73YQXSVdkt9K1IJqh9ssNO4IBwbtWCBsKEIhE+nKxjHV + ###J4FDD87GMV9mBxbde8HPuIiyGO2+2YPZhoP0du8tMgxfrGTyAme9h2nSxo60KTNcKi + ###IOnYIWDbgFDAfXnlJUOJETBpZQGO9DYJAXaklD7RU3+rBnQDUd8LhSpDngKIrXEb/A + ###JUu+FKejQElFOUGx4bjs/fPoA/AoTcJstwj7nROUH0fmnVX4UGu4B44pOQRZI3B9Rk + ###taZ3Y+ETkmhNIuxhA7WA4ojo9kFxzyY/SwiCYGqQt+GQB349FUr5KwIEZIBlrScSgo + ###Ng9pABFzDbYivTjIvKbMUST4r6Foh9eV4ez8wl8wau3j3fc7J7s/LRi99qQ7jjBpiH + ###sUj8XbyQgZUG7MJHtinCH0PuDLB8vSKzNFkGW/3wThn7nE23+/t+eimZpcXoFpOJqO + ###BZ0If/yZ6SkGgBxQuDxSd67iqyHqGajxTUCTxA7AFoo8capFDxb8K7naT+TmrjIFnY + ###Fum3uUUwR1iXzs8VBJ32mRTwrQShlbLHsDH1gsvuqObgv4FBi1AM/xz8AvioCdRXqD + ###uRqqRS5VoUK+Z2zKlu9fmVVUsvuy78KIIjzG52zvNHpPs3MZCuQS4C38tAmAT7IEwJ + + + +Valin, et al. Expires February 17, 2012 [Page 131] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###xZD0CB43jqIAD0myNWoVJYxi0zHRNgVMWo1xuTdXhOF/beHu+dpDpBz7gbuhOTeKr6 + ###4O6BhW7K0PD0L6NxdH4VeT/u7uKF/8kQ3dzIKjDhv64SLJeJ5z05t3i+i5ZosVY7dn + ###NlphOfP3p3t/jj9P+H/dlw9ACBn8RnQfyneqOxJvf/awH5/9cb1cf9/3f5uPz/Q3bv + ###TxsB5twEWHBVwJkaYJmrAuRS8n/whMJTTEmPOqDGnEHJcTKcTeidNt49fXRGeXRGeX + ###RGeXRGeXRGSdsT3u6c/HT0zgxIpZ84/Mf1E5USyHxo2oIpiJP3dtafJqN+gs4S10Mv + ###aFbQw1/Hnxen1ivey2RaocsBA9QP6dQqmXDIJwpqeoVQcYOMiqP0kAHSY0CGoCmDYA + ###XN2nq9VOAssBTk1Fffg6ZP8TDM3x1QEbe3g4b/9KmOrI9Z6WphwYyUij7J/qbhsGPc + ###MFfovDvwaitBPWhshM1G7Uw916nu6KovHf/44rdvlxqrYsHK2apZ0VWQL81iaatyqi + ###js8XGfbz9UV24NlPCCM96QLr47ADLd+GlAEdDfw39SqHRHCuNs673ks45QtmoFLzOy + ###xokSjIcqqO7z07nXDoay+pW46nA4jV/wSUM0mcAiAZvgqJfcVEI+0sUlhWN4qVUBKD + ###AcoOUFVmUK0xvWVlZqVVqLooEM/A58F4RrKm6H14uRSGWvtFqBhemMSh9Gh7R2F2GZ + ###K3oX8Kgvwg/gluhlNIkBjf4Q9jsjWJxuZMLyAudg9GGnnwmzzMesRC8qJT1LdIphke + ###6BE97yoSxQj37OBgheptETL63EpYKJE5HrOZGXPVbOMAuevPmB8DG6CjxPtrfDml8B + ###UsiSFJFBFNraCmuMCKDgtRhQxQuAdczHlepKPajXG/Vg/Qy2kvi0WKiubDQ2qhthLT + ###zTVFZvoUqtttEIwo2qqlJdCZoAo7qxdiayUgozS1AS+JSYFF+sAZDjjSkCUgMR/tfN + ###gkGg++/fdhBgG5wiPJ//3vgqV598teVVGirrnuh81aT0TcXEDG/IYyq/oOy9xnyKwF + ###GFELbHrzFpaK1SL6oHNXwgfsIAhsqMNSHOgLGCT9gIQzkYXtGDEWxuNNZrtUbdHEGr + ###AF7bho1bE6tVV6pr69Ww3ghrZ0UsogZxwsF8+EtJdRe5y/e95171Zu2MP+aoE3I02C + ###KKgylsxBTTkiRYqddDwLdar66vr280a7X1NepwVrpxzANdF4MuYF9rQX0tWK82Ghsb + ###9UatulGXotE6nnfGHslfGd2mDwyZHhITH4ihRzGCKjjwdLjifRhIXxK0G1L+ABRIg/ + ###icbvGJQOSTLGvrJc/MB6sXScXlLOcnk3g8BWJsV8veM6OCz+ZbEwm+oYPHtDLcuEDi + ###mTVXZTz4Gx+zVH7JxClKmYB2ft15eRw0Xb0QSZgRqavoJupMYPF35Hzvx2aC9iSdgR + ###2qwheVGdPIKwoVzcyiqiDgBC3xz7JH6BUoObjVT36fNoS6R/NVaiy1lws+ufug/ksP + ###qkglLCggcLvB9K5V7+/w3wsrLTCH5k9T19AwLJibuij81ipKXiEJT2kc6YLzBzmvU8 + ###5hhd24ksggBmkFalQ3atUQp34VpnKzjGKtWd1Y34ApHdTWaxvNjTKWrAXrtWY1CBq1 + ###tWat2aw2VFxlWIEaMPPX4X+wDDU2GmtNqlFdbzSaUL4KKxo8C9aF/BQdytxo2/3YwL + ###Szv1eaAKhUCLa2glrl1cv28U8H+ycgj4PGGuJXaYTBWtkLG/UG/Ajq1eCLWhJuWq30 + ###SsDRg7hEKt8zs+bAyPFcTiqg7HJ8lQopy+Y6svPqFXD17sfqaTmVpxgIK18G816G81 + ###7WXC93P9ZPffExZ9LxT6jWA7q1siJRCXoBDxHbclDXpBNr/1Ox7j01172n6XXvaXbd + ###e2rsKV5VPaRLTT8IvDBcr9b1g9AL6uvBhn5Q8zBjaf1O6kfhH0GV75qWvX8Ac3BmGT + ###9nmhuTjdYpg6vyFBSjiJoTWtlgSt6Ug2pG39gO6mllA1ZiNs3amYwNBQW3UPkKCg/m + ###TUUMKlfDtst1P8uAr6ppPqERl2+DuW9DL/36Va3MekeaxcSk2Pv1ZO/wlchiDdNQKl + ###OV0BaMcgBwv5OWYe4tj52f3aiEW5yyAkZbHQOisS8ynkZlkxU6Zqtvg1Sk3rehVwm1 + ###w+7bGgxQsFHXTP227tU3ak3aTO3Qts7iUXZhjrw6mT4xY8po2L8dDK+AnVdgOcMb0p + ###xpBAhMlsGIDH+kjYgMTuy9OUpW6yveEadNSlfJZ3Yp/XG3WQ1c7C7GUA/1Oxjqm7KI + ###t/nWYhL7VZj/qpZ+9bZe9m6UdEKlc8Zmk0B9C9W3mvpWJ8Ii8qg02bTl7Gm4xCuVyc + ###i9lbfOp2gSjkya3JY9l0CAGXoLc/PGSrNuctT4XO5Q4KtcO5B7YZ6aE+PW5xzkKok6 + ###gsYq2y1mPCMPO0PSa5Ip0VHkmMMKDaDxDM0343Pfp8Ny2hyRhPkajG8Y49uvwzhsrN + ###WaleXx5l2J8tbVOwEdmhNfKAvbnzJymev8r3s9nqx0H66N+ed/sN+qNkX8rzCo1qoU + ###/6vxeP73XT73j/+Ve6iXVzw3n7hxCugsQwvNYyixx0O+x0O+x0O+x0O+OYd8qI7S9T + ###7oxP7Bj3jOp92AxYVPh/tvyl7p8ved6yr8jDQG62xQuWs441LZTstvj17tHaMO/eMs + ###GkewHWN3R6GWRWRaicefZewyyproxZMp6tg6NTOLNNjmc1JyJCnJD9ps0hmQlQrbU6 + ###mwKbMkgBPGOfS6BF19kuA911pIJ5iksk80vFa9LO6oYNNXEaj7M2oRff4EZuJWanWl + ###2gwb9bBeU2m0yWI5PA85E6N5XEDWRrqqiJtTUuypMCqc/ZY0q/LpJGq5+BXvJVYCn/ + ###VnTDrMHsj4ansb3jR9NjWe28Sle9azURlDpQ0oG06vx9vAThJNpL5sXMyl6EveNd3z + ###Zo9d7OwZJgYWuSqRetWbffjcwMcXiW0Rzf42oAEItQysSgXCHg1j9Bv6UDJ+iFKso9 + ###MOAUpvbbWCZoXzCgNBoMTWljJ3UJ7daSxCyMUy4SZ5zw4xuymsL2J9hw2vWOrURf/Z + ###SCx7V6BoqP5LWOyoLB1xo94nXDT5ujIbRWTGds6VLHhQUqA3lLsbHM2O3Hd0WnwVkG + + + +Valin, et al. Expires February 17, 2012 [Page 132] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###ii+godK7U6Zr8ol3IL/it1trc7qWdFfF69WQOq49E2v/1C/3I0ZYRTqWwLyw+mY6Zc + ###1MpLHU/hYVZVb9ZBGafL0wPr/r1gFHF5/QqUFZ1lW87Rfok6wTCoIcRgtbhH8f9Gw2 + ###s0aSN1rofyAjw0rojP0GiQJUA9stnjg+O3sOS194+OTt69t47k3+4cv4ZZVGAmxA9d + ###YT84/Ll9gkvfx+TUuxj2e3xd7Uo4K3QjsS3HW7QkTwphMSkFPiqFmNW1Fhqpcg07r5 + ###i0GnyjdtrCka7eiKuNQbl6s8Ofl/B1lz+v4OvL5iv8/1qZitfW9/D/G/hiJ9xbf7lT + ###w+L1Pfx/A77u8Wefi+9X6X8IPVxvvtzdCRB6bXcf/4/Q9zZevqqt7Qjou+H6fmM3RO + ###jN9frLVzsBQq/vr4W7YQ2hv3y1t7/28pWAXtur7q/X9hD6+s4+/h+hbwT13eDlDkLf + ###aO7j/yX0YH1/YzdA6OH+TvXl3jpC36nv4/8RenNt7VW9uSugBzvBfmP9FULf36H/If + ###T13aDWCAOE3lhv7r9srAvoL9fD2t5eFaHvVNd3Xq3vE2WC6u7GWkC47+3j/wX03eo+ + ###/h+hV9d26vXdJkLfqdX2g3CdKAM7/52NNYn72h682d+gToX7uxtNhF7bD1/W1tcJd9 + ###iKBs0dAX1tPdior78kur8M9+q1Vwh9f5f+h9Cb+6+qey+bAvr+Tm2/vraH0F+F+/h/ + ###hl6HL/sI/VV9L2y83BDQG/vVcKe2g9Bf7jd21oM6Ql/brYUvgyZCf1Wr14KXDQEdSI + ###H/3yhTknDM40mRAUHyt6Niu1Npd/1VYOR2Dzn5+kLkh/9tBop8zAFbLgd484CvNpAY + ###wJWwHZW9dgf+63Ki5HYP1rdbLBKNYQGjmAeTId8fjybitod8odZUPLiF6UXGXlx6YQ + ###eAZkz4youRyB8vIp0YOZidc3Ii75I8ZbknLGrt3larEWbTWFsH8LC9IePqsNezfXww + ###n4rxswNUtR50KSBlu0crq3FSWuBmScoJaaUpbsiadu/0OQskcWDhGiCg7h2GpkeXUk + ###hsw6MZxeuRchoLwkrO5DV7LcNfeGcR6Dhjao8MhtO/AVF7vTIOJ14zETFcOJZqhEoP + ###lI96zBSSFzhcCjrhyEsxkyu6ysMqAPaslx7yTXu4sfGlRzw93HWf8OkwPt178uZs0p + ###9KLBEdgeiSrIR0/gpesmAOPm8KJU9/rqLJZfapCtNqPwbNZjPDoGK1z3Atn78QJKVN + ###tnv/1e5V2KgJ6LRMDkY1jEqfqnqVCn6FVluwQiucEOUWPMTzfmtaFNodAcKvFNpd+b + ###2EVBfvn2Nlv4S1oQT/UnUCvwhImRNJW1ZTeoBwytrp850xD8PtfsY88jEoZxRWiaMX + ###jWakTcbdKd5Y5Gzvk+5FfBVTFBnz1h7ZdLx3t+PoCpjwZ67yjxmo0cm/YCr93y7olL + ###/vJ5P15hdky+MhXo7rsU0EVCyYqBiwuTPEELMDL47GyNAiDhVeCcNknCQkL6bT0YvV + ###1VE8HPXjlRs0rA3H56v/bzplK9gqgWLL7MX0qs/TXEbU6gyHl5n4wpzy/gwj7WrjE9 + ###4tijEqLImN+POwTxQS6rAIvXzN9jhO7cuhgiTSdNspskmICvFAKcKoHt6AOBgwZTn+ + ###BoaPpRHvxfIxkPocNxADPjlizbAfTc3ISGXv58Jh+TXD+EBfCSnxtEV9ZI8JNkdd4S + ###5QVKXNmrgshyanMhY5xF0AhbGKLkHsviZiweB4eO2qzLI4oojNFJsaPQ57PRZ1cYRR + ###uzAgAdeN0O0kQl0QiVdIVuIVcV/fxOmw0gPIgwkzxAwGwyKe2FO+5ocTEm5HGCMsoo + ###tVXRHtV14r/ZxQ+lBNgNfb6OIB4rhw2QpWVlZel0FfvSx2L4bDSQyFLn35/XUlKF/C + ###dPK9F15AiPIGVrz2ZRAHoCAd/KlRQJR2hMAenslzKxTIh1sBe1S+xi8YDhhNg5fxCx + ###yij0H1FP9DFwjC+fegDGoL/Mf/WP+m/mT+etUvZQ0kxKf0j/Vv6k/mrxeaQOr4dB3/ + ###CahA0GRQ3GRYF7DW+W9NAqk1TSBYJ6AiNfq3SUCCKkOsM8hgg4GEDQXMAoJPGf46fg + ###026HutSZg0q1xpoyFgit/BxobZnQALN/CfYA3/rfP3KmESbNAzr9ao0d/G+gb3ciPc + ###MAlLhFjDf0LCYYMehLUmEqNRq1Fvq+v0N6yGjSYDrVs0CbAw9bjehOpBk2hS36jjj7 + ###BZJ5Dr61SssbFRJaBBo7GxbgJpYmEE0kSahOs0OgADaoVr1Sq/qSNiQWMtWEdgNSDr + ###ugVkHQFRR9bga72+TvishfCnUQsaWLm+3gwBdG2tHq4hkPVmHYYNN6+oVHtC6GQkzQ + ###Qj45vihicTqDyHlcAbdj7B5OaAJVJW8BkDSAuYh1rikOlJzO3z5DOdgRD+ql2e2lWc + ###2jCBYd7jNPaN80xPSYECv4VyeJeTRATO99UQZnx1RchykLCoBMY3GJeO16H+BG+nX+ + ###IdVLzfzOuAQCDBlaJ/5ug+YuCkAJ0CJGMUjEQHEixZiUliRS7VyZQUOYr5JK5Z81Ij + ###8lSrsFbGglY2cBRaJaAyGxuiC0Uo5kEQd8pRuMfQCzIDiRh7aWWA1tJJWRx5CEG7oj + ###lBWE0w60DF9Iw8bFV5TTZc0Kcs98WAVk2JXVVS2AxaBZ0HksJATG6vrmL0tXyhOeFD + ###4XX50C+r0FQyfwEKZpS4H5wSt3oPoSvnEDxA+RSQ4GGpY/yb+qP/pqrXSOTQyzWWOg + ###xEwKoJKA3xdy1VHZ9zoZCK1Llek/+sNwQwBhPUG6nq2CRXbGKRIKTWwxpVr60xRo01 + ###BrNeq6WqY2lqkSvWQqrXXOdH6wwsZJxATm7Y1amPhCk3KOo11xGVWrNBSIP4Isxq1b + ###VU69Qp6iEhKtoT9dY36BcsLtS9OgjFFOWRpEwY6p9Ak5tT1dabtQ1cPtYbadKhV2KA + ###TolIljL1rsxYlrk1WQ1ANxtr4YaWmr/wHEBtWk4CpcqJDZvQMelokBRSmOLM6i9sDU + ###fwf4m/lAISfdJOf7iN0+41/MvybTZRxehIE0NvTidz1ETDis8yK+bAerRBnmifHeW0 + ###qzXRuzTA+20SHsLRd0WSKZLnGQOShErPEo2wulVGi2yXtudIuNg7Khz6ntSxpcZ/VL + + + +Valin, et al. 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Expires February 17, 2012 [Page 137] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###b9Wpipr9/PRAHYpwLpVF9+QVdW/+nTv9CmX5Nj958/wisgCL5BDVz0pP1jWwaE22aV + ###VDYHb3IQssq4sXJAwr2+TZgMHFlE0uYvaMy2uvEW5tgv0FzbtwFMLobjDOEN0skTMa + ###PczFUQtyG5vdUJpAbpQcgi+sve+9fHGTzvCf+h+voX83QAta7jn3dXXw7HfVzTpROC + ###GhRxArcYX6ukmwUWcYANy8UIIlZhms47u0dEZuJ4NT9vJ6tC2G2bU+j4wIWFfPvhIN + ###tyqnKWHGblNAkEtoZU2nn37s2eEEtWJ35qo/TBIYm6R8fer94+Rga5Ho4vvc4s6ffY + ###X36JLi4SQu2vlUK2VEh1Vffp5Z4YF+a0lzFJeaMDUDEX/wXYf1PcPUB+7+2vBu5Hx6 + ###uh9+Purpghc+fhkhJnjjxYLA3S+L76/358905hS7/+nKgW3jc2qlWF6bvj0NvbS6G6 + ###TDNpOfPV3cxw7/E/37482DnklUage3x71UmigYsTMoDvTeU0Ib+C2CL268lBe7dR/9 + ###VWbcx3jV/9pw/NLP0hbAsXdUAXWtyD5jdA8t5EhhVU8MSPmABgNiqTCo4J2uJoMhzg + ###tSGRne3PMw/F+imUeQnBkx/zu/mBTqoAld3hbEBBJ+NpdxNdXPrQ3amH7j7iLCsNvl + ###kXYGis8Z9MkXXZkuG0lMJzZiBn9fFh8JwZiNrMmUV4ZmBs+VmpJOyIibVV+qPysP9R + ###H5f99+psPDjvDnsPY/1dZP+t1sNmmLL/1pth7dH++z0+rvwPAed/OEmuhtOLW+/lin + ###cSj8dJB/65JftVusJ6bj6IR3Pwozn40Rz8aA5+NAebGR+8H9TmRa61cfsntPZJ663x + ###2CsE+EalV4BpiS9UQna88YiJ1Eih6tyKAEfTMV7L5Ig541V22h2vsKUZY4frqOHy0i + ###anvGNf6CnIgxUyAQiE9nZxl8XOR55XWPcFmOlwGvXTwGS+AxFSnW8+j+NzkA6g56Xh + ###7h69El5NXgGtoQxYJu7igASc+c6F0dudX1G7KxQwv7mBpY/Xr1aLL0XnOIk3UmcIa8 + ###hn1P4FZFAROa36BchQkRiXE+5x0PMMqnSm7xVMzCtGw9zubgRrJVJDEsGAzjntuHln + ###CydH76hLVhr24INPHdSNUkNvhtcC7D0bewkCwNPdgba3t006uvklkgEXjBT3GHpzFI + ###0p27UiroiTT96jcb/nRIFCzEF/rd6F/l8NNEo4B/6QBGn/wz8u/X/U7z5I3jf5Wej/ + ###0ayl9P8apoR71P+/w8el/2+AOh9UH9O7PSr7j8r+o7L/qOz/MendcBVeLuGakZ6N3Y + ###M5W3d/1C3wua3p5sufIr4to/UTZO0L72N1ZWVlVAlOvTfvdu38zFx89akdsg8D4kUA + ###ACEkgxeegHDqRbPpsDsccx5dECecspogWDbg0VP7jsan9D3WcfoBZ9hteVH3Y/U073 + ###KBUR46+BF60z56D5Lm1LgjIHKrwXuAhnSwwoWxCzA5YXsYEncEf7QHMAJNtIs2nhcT + ###Pt4P8j6T7fecgWM6tuMxFWxx6K4JSHCVuflvGKn4rB9nUpJZ8TBMWo1T4SKo8U/c+C + ###doPIE/lhszfKBSqUU32WohBW2pBQXs3qfTMnQpgUXqk3Xxj8uz8zsVKHnBablmFUEn + ###aAxx0e4ln9VFqfEYSolICmZp6L73YdTDzWGG62jpor0lD7vZcTUGjMvYxiHd9UICe4 + ###ft7SBNAfvei331NqDrhKlrMPgcw/8RiTKvQvEqqQSV9GuuQl9bDKaUovu4jCD8bDUG + ###x9VCd7XUzVL9XU4Y/ltJ1U1DGvtl1wi9hH0eyghvOABF5Dr28D51rer1XnrnEat886 + ###754AQhsFuKcaqn5aCactHvjOPoMnONR1degW3CWZEq51Q0Lu2I2zRutIzrCCPTtb+t + ###uOo9LtlBs8APyhTCT8CX1y/OkrEj/8aNcfEk+xY20OXs5MU3t8ZzlIaHqd+wkc+peR + ###VfWVL00+bTVB8P3UGCmNMnIHyygevpfqJ3DCuVHZWXJxZA/bQFGG1+ct7VQZBCqvD9 + ###WOg2ShTA9KMhTr7YMAFeJdj8tN2CfyoVB1iu3qI/sEqlweDzKo7djRHj6NYeTsAs0y + ###t95SrJjCiucPNHtBcPHOOC9R50RO88oCYRlh60ijlo0LPvOGjmCGXZTgwjvEwNGSs5 + ###Ut8o6Hb1xzVHPV54UGkhnWWAWg8neJp4N55nLTX6Y1CZP0r90QpUPzpHYFFXaj1uUB + ###msBEDYofWG187ba5bqBPvAcT8aLS4I+CwuNHCUECxo9JlTbhBP0jdXtOGbGx40M9Kv + ###J6NO3gDlB9nAqAZnD0xxfHPDw6542Sgo+p+ZCLKOHXkOH5aZtHzdWxUeVBIcrmwFfp + ###GulLeiOOZh1K3qa7ZINDI/G3PS1WX4QD2tY+npSB0r37BkXlddEKWD0kBFgGAzd4tv + ###yiV0VQ5K+ZVatbSxmSpToC+gHK2GizGTtP2ZcWOMGJSijlqDxUU3YL/tVo5SjKxJ+Z + ###+EdjywtGz49LBr3GqR/lagyqnu+kf8iYFd5KNM5C5RxojXhfOzIrC1a/zfwTNZjtV5 + ###pGs1J9bgH22ye9CP0/9j2IsnD2gBnm//rYW1oEn23yaWqjXQ/yMIH+2/3+Xjsv+usf + ###/H7vHB+yOyWTkLOP09nMXXvR/H8flwfOu9jW6u4z7FHJ9jRsbNX6rGo2n50bT8aFp+ + ###NC0/mpYfwrSMq3zKhExLvvUIc2HYT4agKcxGmDttScM0hwiinGRknLbyoRrRimMs0r + ###iafOSM8avFKmatrXp1+K8J/63Df15w6QUrIfxXh/9g0xReeiF8D1fWvRo89+qXXh2+ + ###N+BdE/5665feBnwPoFyAD0m9owS2mMEVc7di1lbM+lqm3MiYZ5uyJVOC8jInXYbnmD + ###4XszVjynhMtIsZezH3OuaCXqPyVUr2CivpTh9k2gANmtMZRQ0qCH+I/q3XA2n3GV2e + ###8W7lz8NxJ5n4pnPzy4MT2im1jw/+cw+TwqPxLZl6RFaWn1NyuADpCsCntLwEqxiKMZ + ###muigzFhepKsL7WQOvc8eF7gj8nBy1Sva3hfx/qP+x/Tyk5N6Ybx/TRmLYckwtjFmjM + ###4ItDhUOG+XopC7IY3kVAMbU1ZbAn4HUeZ8x0janZMZMyJpfGTMCYHBjTAoeCTygHdS + + + +Valin, et al. Expires February 17, 2012 [Page 138] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###7Q9TIDBgwxmzhmzZaYY/5uAg4AG/AOUzgT9tAQZ3IWzJoGCi1jXmjMfk350zegIOZh + ###x1TKhDVghOmdkVsx4TMCVlhjuuM1gXVgAAWaYYppzEGNeZoZYyiI6bwxw3ceYEyFju + ###mTid41nj4BT7mnQR0A1QBoDYDCfMIUzZiwmdI3E9YAFNM+rzUFOQAo5l22aF1jWhM5 + ###EGgDug0vMTk8JvvG/NmYyhlza1MGcUzxjQmlFa0BKCaNxrzumO2ZuASA1sQAEtAmAI + ###KXAczyoA7foVUmBwCFljGFNyWyxxTUikPWDA6RgwjvaxIo0CuAl5iIm7GuCXIAUBgI + ###5g4cxKZgPQCKGdLXAwdvNwjbp5i2eN5/AXQ/AFYLgLYBcASm38YU30ET/gIwRqbGPY + ###VBQw4iWSbvlu9+gL3v2/bbo1d7x+2jwzf/fOo5jSDWWgDihuJ9TtoUUhUlvyct+3kF + ###8UhOFKTFSlzPwN1JGgWZjIgQfNt+d6BEKP4AaQS7x8ZG2GzUjJXvLN0bktevsB7K6b + ###DhdWE/AhuCPqfQVG5tZzPYfFRhv+Nd/vQvL5r1kiGVuE56U7qbf6JvzF9Mp6MXq6vd + ###7vgqWkGvTADSW4l7s9X/92k4We10pqsvo/Fle38c/zaLB93b9jE0CIvs9KpvLQU771 + ###+3X4IacwyI5S6aHQR1BqA+6vKlgGU42zuQ9TxiJhLo+KfGf0C0s2WwQdMTGIv+rK3R + ###nw2eCdV1LgS8T7/r6/Rnjd4CPPpTC7kQlKGE9Zwjvsa/6nX606iJ5pr8e43fbjSqJD + ###IJEkw4LoQ/MynQucfF7vBqNJvGbdIXJgUj8PC+iGt2hhdx25PkXzH/HscyqqBKg2HY + ###NgVYDsSlLZxl71MZNj2wMYS9TZm8KcveAIeuLKK9tXTerR3gD2JiI9NquNLwribial + ###gH1tdLcs9lb1hAkB0gEyOGJh517U8weQuQqGj0zNc9sixpqj9oG4eXw7OC1KL81dQD + ###PDXTEWVjWY3t57j8F0QFTRS/WFAtlIx8loYZ1nifE9gMeVHhoM8kRIZBg+rCHOftJ2 + ###Jbqb1NU9NS6J/s6Qx7a7bc4xRGddUM0Ejj1Qo26e+WniL8QOJL6UvVROJXwWkxxFgV + ###+xPVJ3HMaKJ5TQEzyPM1wXzD5PqKF98nQKCVeMUoMBlFXUQRttJXQ3oWDbyrZNAmIW + ###IiDaCAtvDvFqGC3zRlbVzxVXBasR5QpEhgeTNemcYcmBnNvnaNEhRfDf3VsciMhcyO + ###+V+w+QoUoIcmswGUEhaiF3fnJUqrJzmeq7dahx/evPFt7sBHiuBvmMKSjgVFO98kHr + ###Ml4Geyo8mLifLZgELbKvysChUpysLLCvDAmPIJWdSSp1jouCFwYQPIJM2nGbSIZJmw + ###uJjZLBpziHJ7aPV0kbmt0XUd+AYTQ/P5kj5eUpEEARXsaIGBlrhnqyEOsr9aCLFPfl + ###GZ+9Md5/qi4wzCmp57A0rWSDwNQ8D++YIOwlJGaZ/R1pQhQNEVBVEzAcUE9pIcKZJI + ###ss+lhKhRNEMppmf3qYsWBhpG5W0vJXtzmtClzJOqwOxzJXCGRFZ0h4lskkF9V0+B8x + ###wnrLpOBXoaFp31KkYrxlnPF3Nk38d8KWJw68VXo+ktc/GKPYqf5o2j2Zdt8f3TaXY4 + ###S6VPpy2jrC1fWrYHQ+Bs73c9MfY+x2NGlu2anZjjv8djFrLyYgIVMdJ4s7iaTOLxtO + ###Ak2lYrM9KV9BMcE2OS7uGVFwuVwRAaH58rZK4TMXmQV+RdDYwwngxnE8zMvgBDi022 + ###WmHRjbtvZvpKLbZflF5FZ+hSodJGgDYZGQpGRFH41+Wql8pbQRB+jrvT4VhrUlfRzV + ###11FGGcjzG25o4BE0BYFhJqI7ILZBchO4lhsWCBKMp2hGKo86+acF2rk1qYdi/i7iVx + ###K6r7IPh6hLyh1HEbbtWO35GW+LbXnR6ndTxDes5DPH2IbCDP0jNt59FrCwNKkTEzlE + ###a/DZlxcIanBPKGl+486dvxeDTsa42MTpmI1fCcpYLHId0KzRXDvEV7KHot1lIucRVN + ###x8lNdkGx2SEtHAzHlxS13D4wyK6XaTfCS6h/uSW5ePNyjgMhjnV6fBVvX+Jiwmgo0e + ###jghP3Jah5LmB+h0qnfRjYJxOJyWyKczkBmc0aKi0qfnKxSVHO45Gm4poOjlauFP8bG + ###LIK9XZRKZRShH+V9yQGqST6dbcywqaqXnXfmuFTujcjmXWlbiKrFfPqWEPn0UM//lI + ###CScyHCeg+NliJn8pEvepFIe0I8/EzzMKmGdM/okXvGAoIplLOoEebxTTItVMlrQ68Z + ###cyXZl6c5ZiWyKOkVj5YRhNfuwkybxsvYGTgXm7lObjqtTp7n2Utrizc6opbchZkua+ + ###yGpB8Lo0V/eH6o6r15q12tpKOKdc/45533bTyc/OcxRTNTzz8c77Wp1o4vVyzOHt6m + ###Qx178TsfguJ9FiX92ThWPrGGjS3PZGgx08kRMBO/du6HPjlcF+t5QltZTQxrYhuPq1 + ###ElwlX3+fP0lCroodva+uTnVrbmetFZZNA5loUmcxcGwRwpTIrSQZuSuB69tgWKUNyU + ###Jlb0HTjkT+tlDahp7syga2P5cucV8NGPm4ZqyQxsBVrCC8PnwyHacnBvSIaQRBjI0M + ###9iJhwChAoMOjJ5CUy866TfpyskVxFpAP1b1KOTAUyFhKPq6VHfwoOpKgbK2sdMxhvN + ###arWa3WGlKJ/fm3SHJCkpG4diGWi1Tm0aj7a9oBrW7Yd/DX9ofQts0PqEjdDpXx9jVt + ###HWIriakDMKKmTKRLZiqKFui2IxQApuSUvXA6K6oN21BhvYKOCrQbWg6bdsur15C23W + ###GKpMx5XfnUbVDXfdCTZcEmytmgO27gQbGGDT76oGfdCKhPJjQpGr5C6xtlK7y2Aa6G + ###xvv3nrM7LfaERpb+PaZ0khZeyhaHGbs3x4cs1GAQ74qj3Vu3G8Cs/jq9FFNAGp0YtH + ###ZFUFeWEZe1dIzDyTe49nuJNWtWS/JyqKXjTxdgr/8nF8QOmrrqw3iv/6r0qAhqv6Oh + ###7urHhH5JiEsMl2P+v3BJhoNBoPb5IrOtkHIaYHgwURnWFQQFCCJN5K4nM3ATtEjl3e + ###PZUporpSa6B7ZFCtNc7wGETpPXa1wE4wUV0J1jY2NsLmWmN9XrUw3Vq4FmxsNNeDEF + + + +Valin, et al. 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Expires February 17, 2012 [Page 144] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###MFMsQ9nFEMYi6ts0yBWHyRsidhszR2xgLRfRAGKI9gOySbGbwKIPnRMmIqmg7IHzNX + ###XXWgjP2YscA/+vjNP/yv6vwXX/3+R8X/cTHcM8f/8QMvijn+j+t+Pf/1R/z9Iee/OP + ###vXIEBfD2p9Paj19aDW14NaX/6gFrppmkGA1HN9aJ/pZTEiUH1sn+wdWi0k0PQ6qVI3 + ###SyEjaNZYYp7G4pf5UqI5N3UIEnWPJIoYhnw5lsAzIOEbb19ZZ7O0v5zfjI2XVNQ6++ + ###UGCe98OtXBQiVwtHaopGgnDcO7S1300ef+djFDl0oN00XZBqS0EJY8h1fW+quWMk+j + ###3E0dYcmbLh7HH909/j5iuTTX3GQ6XKSf3F4p8soS95roAvF8X941nygvw2Pa50cnyA + ###wQAKRXxlV1BsBy0WGGfFokRc9JVAjcT5ikDNjiaYAem83PnbpsvnRlNGMPglwWaAJD + ###0QqosB4z6VWu3IMnFW0Pk1UQJpsA36o6uAGRRa+Hz4PjZWp/UVBepp8GzCqQrQbyJw + ###NTkasz4L+7+93jk2N1tMUMMy+ph8TZOdUtpR6fnB7t8mmxhldK3X3+HDn8wY8dq+E3 + ###OfDyYobWG7TBXsq9hpXAyMDwSoykPQyedJW2xFZCBoneYqmrkWzXg67KyS+WvdkiLW + ###bjKLPd64FZ3QposXJ71Nk9A5ZKI+4enXV4ZsdpD++voq52x4u0aixiVXuV/XL0T5yr + ###Tv5J4uMf8dcxf+3pyCwSxv6615u7jTKYjqU4osilYY3pTZbDBcmCj3VYBsFdwKfhJR + ###KeRZnsr1o0p6pMo3qhLKdLucHMOsefpcvSjKsec1sYYkYr3TSbXbUFvZwszbYwuk8H + ###j+vN7jIDolp6v+DIu73RSBYez3OfLPEVc8Wg682X2foRBDEX5qs8aXtdsWU8GiHadc + ###e9xbvFijXaEQSdYdCuhYmIS5Dlu5fTMagrYl+bjgQ1EejdBcjv6ZRfoK0LGkfOxOg+ + ###6M6z2gyf6GxKWubri96oN+lzGKD+8tZaV+HPBQHJVvmUSYp5A9n6Ao1HTwQduUcPXd + ###I5yka9lvLZDgnZGvUapDYQhbsKsve00H1175xg5YcySFnve/JNbgDGfBQwIicYjKZX + ###nfwbvALapdfmJBiJHpcxJz8HWgVZ892oj5tWk8tGVcYsZpNIoF+NbP/cf1X2P0Cy/r + ###suHdT+IlbA++x/sRcV4j+FvhN+tf/9EX95+98e2es8tNf5RYtcwbS3d48lMIvYJCGb + ###clhlnLg7T8ez6RxNU+NShAD4n4qtfbX8fbX8fbX8fbX8fbX8FS1/Z+e7e3+ReCmZ/S + ###//VmmO0Ad+t6tjb1NEJAyorUx7W2Mh0TtGtG3jpjouj01ZRiGm2VxIl8qSF8tLEC5U + ###MsfnLsTpJl4BmhQ2tAsAPm4Q5W+RCIxKFqbujkCO1qfM8a5u3Fn/DrN8Z10Q78Ft+H + ###VDJ+N8Z8RFjLfoFoG+ZPzLKPo435UXL89+MHsCNPFuZvSHWBXohNKHdJQiwWNvOsho + ###fYef3yEj053+hP5ld5hLvaZii9Vb5/iZZSgP4Mfd0/3O3mHjfW+uer2fAqkG3gWvhn + ###TlnmazuZ5BMnB+ycLRirBYuQlCCWygDkRVEMqAs6J561hce94b/RD5IC2C635oVQLL + ###jEUGwOoiEX99ZsRTUBDEKloWwVElVY+cG4O3b/Dl22xR4vqhlalfAfMBElN8y+uW3x + ###UimGVLuLaH3IV1+LlWXur1nUe44z1Y+LTeZIGt18Ac0wG9bK7TE0UXK8bjf1Cd91WZ + ###D6z22VCDjinCx3G01lj9vhpNL8h0ASiH16dxVolTV87ypOA3smf4mXSO6eKCH3cPn5 + ###8CYzW2W7ZAy76aD0HkAamWAmYg9bu3P93ldPaAPmG26n5pWBQpKECfHpt0LR+DG4O9 + ###jaaTq6YkNa1vjSTXCB+3ggxaDTX07tHuXzrdo85R9/hkdw94+pnKXuy3zW21uIvScs + ###tEhsfygONuNlvlJkDy6TwDUWBftSGdXl9dS7MlLW1sN7z1e7O3BFVV/+yHFDLglcNQ + ###6J4JBFgJ3UXvfXrZlbHXwNAsVwFK80WzWbUSBHnMBp+U+5N73t52mtafC5kIMfn6NF + ###y93UV/3lv2rxvPD0+e7h5yW128DGPda25UvgUYVr62vs+N68uB40kOzDDK/KrWJOKP + ###XjIPRvwMYxnzGp+Cr/cWWY2tdcj6cBx7AIo9BJ9K+HH/tApVLBBnJts6cOmiK0eGaW + ###P7IYz0HqbPPI5mPY+mpkxUZmoVwKsZUyagZIHw4XVO3P8ki+sK+x+o/2QCX3QHw9v0 + ###8veZAevtf6EfuC77/3mhGwTunxw3iiD5q/3vD/iT+7kxlpPWW9DoQyY7jH7au1lO8e + ###wQRqG5s65w04hO3uCx/pvxjLFks486LYcMkJCui++tIMGwQO3IwcSDZRYwSq7nzq4Z + ###4ijteCwTg03aIuxaXDcFVqtzWtHOKEonBumgC9Lu/slPrhHxLf9W+lDyr+CLbSDHG/ + ###j3Fpbir2tey/KclhWGLct1EviIk9aaF0Uty48hLWgHLSvyITVue621Nia4bhjDpx9h + ###mbANpd3Ed6GUk7ShNj/COqPQhc92GPFFoq01P3Lhjd+O4DPwPSgbxI4PLTvQxFoYtK + ###Fs2HYjbC7AzziB7sReADXHsQP5EzeGPEkUQam2izW3I+jJmgtrCjvkREmAvfMcfHJj + ###H/vqeTFU4HqJi/30/dDHrwRbg/UYYE5oGmsJQ3qKnDaCIYoCgobbxpdxHEAn3cRL8C + ###lJPPxq+9gTt520fQRi4CLknDY267lUtee2Q2jW84IgxK82gckPsIOen8TQXS/wfcwS + ###xPQUAhAhSxh5CMrI8ekrwAnwosTFJ+iSA1niEDvoxdx6Am3gVxgg2JME2lvz2i6Vaw + ###cuzUVELbTbmNMHmEEtvuMn9BS26QsnGb7aMXTQh3mG7vou/IdPQURfkYNZALo4m24S + ###tDFLO0xwnh1EDB8GT08ejsH3oA3I4vmxg08BvwwSLA7DpZxhlGCWyMFOeDD/9BVRli + ###jxCYUc7AsMnlqIuZY4cPiLagGIUBbuS4xoiF8BfwkixpQlitVT5Rfe51S8Iw1X2OHJ + ###8+PAya869a685vj4Bl40BelvPJcXHPS48v/E+B9XgfrnufKPJg96iOOB9yu6+OLlIW + + + +Valin, et al. 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Expires February 17, 2012 [Page 146] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###QZlyHESVsoA7RYzpM8RVGQpYAWS4syXygGtFigVHm0zKn6bIilkgclgRZLrqHkyYRb + ###T/Jk8q+0lTCfIOGA8xhStOAGigMtFrRlXCgPtFgWV3lYTSMBQfK0iUWThMAE2RD6GY + ###YlvYCFgharDp7kybSLQPJkCojKk+ko0pahxnCfSTJosaYTSx6tCyWSJSCChLKC5AiJ + ###PiptyjbULU9yxCHpW6KPsYDQyhQ229DoeEEYKh/PU1EntA2l0Zcc3FMUGiSHVjulp5 + ###lequoIiMmi3CA5tGYrQMtU30hyRD4Ld23VilaePZVDadcC1Ez9VnXERCOUfm5r/T1y + ###VAZW74UFmaq/SlTsWMqK6m+L7m9WTRa9WMMxEuusb3Zfqf626P5K9VcAUKq/gpBS/W + ###3R/ZXqr2CsVH81CUr1t0X3V6q/mkal+qt5NqaZEEGp/gpTlOpvi+5vYBLRFwPVCBmV + ###6m+L7m8gK+n+SvVX+K5Uf1t0f636q0WjVX+1rrTqr5aeVv3V6tSqvy26v1b91Ro3lz + ###jv9ijV3xbdX6v+tuj+WvW3RffXqr8tur9W/RXV0qq/Lbq/Vv0V7dOqvyKPWvW3RffX + ###qr8islr1V3RYq/626P5a9bdF99eqvyL4Jr0n3V+r/optaNXfFt1fq/626P5a9Vf8Sa + ###v+tuj+WvW3RffXqr9ihFr1t0X316q/Lbq/Vv1t0f216q+Yslb9bdH9tepvi+6vVX/F + ###/Q3mz7q/Vv1t0f216m+L7m9IGaz7a9XfFt1fq/626P5a9bdF9zckHtb9tepvi+6vVX + ###9bdP9MtBLdX6v+tuj+WvW3Rfc3ZDjW/bXqr0RBQxJk3V+r/rbo/lr1t0X3N0RO1v0N + ###qZR1f63626L7G7It6/6G+Mu6v1b9bdH9DSGadX+t+tui+2vV3xbdX6v+tuj+WvW3Rf + ###c3ZH7WC0y1gHR/rfrbovsbygXr/ob+wbq/oaKw7m9qMaQ7a9XfZt0/U4VY99eqv2hT + ###WvW3Wfc3tC3Sx7TqLwqbVv1t1v0zhY51/0zjY50wUwlZ9890Rtb9tepvs+6faZ2s+2 + ###dqKev+WvW3WffPFFvW/TPNl3V/rfrbrPsbujPp/plyzbp/pn2zfq5Vf5t0/0x9J93f + ###VP215i/OY5KSiKMXF8sqVSau0GiTFX7dJVb3M2MFKfta12dVX4+XFX0NDlbztZbPSr + ###4GJqv4Gtas4Gv9ntV7PVOFiWTVXs8zK/YaDTIsIXaukYhTWaXPzEsaBalXrM5rbZ6V + ###eY3AosprTV4UecP4JetOWcdYic/MZ6zCZ/Y1VuC1/l5cpqK8ZyY8Vt215i6Ku9bbRW + ###3XWrso7VpnF5U9szOywq71dVHXM0slK+uZKZNVda2pi6KeGUNZTc+spaykax1dVHSt + ###oRepsqjnWjsX5Twz6bJqrjVzUcy1Xi5quWYdopRrnVxUcq2Ri0KeGaZZHdfauCjjWh + ###cXVVxr4qKIZ8ZxVsO1Fi5KuNbBi0xYFHCtf4v6rbVvg89z/1j11pq3KN5a7xa1W2vd + ###hqzB5Vnl1hq3KNxa3zbEGbb+s7KtdW1RtbWmbUhMsuFCarbWsosyl6jYWsMWBVvr15 + ###lYJ/3L5D5OZ9Vaa9aG5MjbF5loyfWzUq11akM4FdssKdRanxZ1WmvTokxrXVpUaa1J + ###GxI0bwIWRGxRorUObQjpAadrKd7c4tPas6EHUP9Eddaac6ZI8B4nq81KaxalOduBVF + ###qKx6mkMGf7l6QuZ9ubSgUyd0eVplxQoDL9irdOWUlWOnKmnZkbt0o/FvVYaceZ6scA + ###0Zoh74myYqz04kyv9CRV1E4GltZKpSwpxMZ+Nam0kbnXzbow7sQbO/BPD85POz8GSX + ###7nPXu7ykEY99ovhst5+h5yZXvs5GmkXVKJoZN6xHQPXQ4ccd5JKM1B4MAHeX+55Cnp + ###tNaCUHw7Xe3K5CNpJ988WuMomQaOuJ25wuRwiKRpkt8P+uyyv2dILkMuO21hVnJ+IJ + ###9Cos/kChGK51ASivMscf82eu+RCOFT+0RfcA0Rocb+4jiou6Si4DgC12HPTXJn8zF/ + ###gH465BtGHnQ+FghiQn4cJL4nro6vtGOOl9CTwy6l5CAHSwagw6uGNCJ8hwUCKkCuiy + ###GxEMIycaFiroj9x5GQUE8ezXT6gmDKfrQEFXxHQG2xzyb5nvnkmEROWqR40BEOl31Y + ###XZI4HPK0ddkHkHwgfcwfkL8Xqd3EqiJxOybCyS7b5CEStdaINrVJACFkVV6K5KpHZ0 + ###FI1yStn9Uy7Jc4AdI5ED5gglWQp2RCrttk6InYVZbcMsl9OwjFp55EFFK4fBwHO/u5 + ###dGoC4eWyr53Hwh2+IidRl/mceFMH5BpKvqzEf8mJS5wJ2T8tIV9gcQomBzyfvA0JpO + ###RPQ56g5CLMyl+LnSbZ/xxGshZG4iXk4UgCHAk7F5JMja8IpuR4Si7QIfk542OL/eGQ + ###m6/5fB6ixS6fHknsSLWJE5F+gh54AeZnh0J8hfkDchEVF781kqz8mL0DLTp4Q4I3nW + ###mJlfeoj/kDcgnUPpA++V2TRzH6HpPGja9JjCX2FpNMhf2KxW+PRHqHCSn7GZITp4/5 + ###g5DcAlvsCunR8HAc3F18heMIXDmBQA6GPuYPiGCyEyO+gwJrJLCQ/y0565L+Q+efiE + ###+T8otPWAd7hJJ8TA7m5PxM4g5CmZzOqQBxZFLwscc4EmK6MUmm2H8cSaKcxnzMz+eR + ###XBwXCdwhgRl/tdShAlQQ6CAOuWTiK9L92uKXTq5reOIGeu631khMJqWCHNHJsVn55p + ###LGToJHoFwRyWQRoFoeK98uPJ4AhIdczROS6XAmMVskZ1XYT5VOLeAHec7yySTsV8L+ + ###8ejrtuY7ZO5M2HXdIyUa8weUn3wUsb80PBwHdTdmSR/h5ZMT+prH2it59rOYgaXpmA + ###O+Y083Emda7Dvr4yvKSmInVh3goaRYuc3RCaeAQEr+r+QGT0cHuECLnbE9HmDCbtsu + ###GzgQPDgSsvY46qhIQDAlLYaOJGCBIGY/VZcdOOnEAn6QzzK64KGQ5dOBO+W256PcGW + ###B+EnjRGuRj/oBcqsmTnm1KOMg2O/2Sg7yHAleAUi2ZHElfd8ldmQWxFrtX+2goCLAA + ###+SOTizq+jvBUF4mYrPdgv9p8WoG8z32sgQQecn/Hmn06dkH5gxZ7m3oRHsjCcYRsxE + + + +Valin, et al. Expires February 17, 2012 [Page 147] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###R4Ye9xHIlyMPTJUZfcoNmJGd9hgYCEThJMETr4yo8D9oPm8z9YR4B1xMrj0cf8AYHU + ###Ub6yPh0AoQJ02ICO1GGPk7Z4IcdsZsKetfnQAHl7k/kpCMhPmXzR6ZQBSXntyjNimQ + ###QFYlCFXIVv75erINcb+KflqkjJVuz5qmQfXwtAIkaxsIWCRaCEIZSZ1shpXUk5nhJ1 + ###PJFVWKIhgSUUb3ASdrAddo5HCSZWEoyrpBJfiSaeiBYsgJAApcQUlmbkfOkanwmJlc + ###TBUoScD0lEWoiVxCACgRwtCEW2WAv0EYZISQiK63uK9XvCu5nDEwMXMQCFhTWSBULF + ###zJXmynw8VrycfeWF1TJDJoFC2LZwd2wpVMyXebTPfDdSvJe9+hVv9DWDxHM8mhkTI1 + ###HMknmqR3xSe68zK/SElzHHc5DfCFtk5onthIq5MQ/0ha/FirexD76wHmRQ7NccKDbG + ###3A5bCoUZCc/ymQ9FiheJqzTxCnb7ZoaBhxU0cyLCqpgH8xiP+UakeAe5QSOzSjQHIA + ###IvbIKZCbYTKmLPPMEXOh8rWk8O0Z6QYibYxHAUWWfqj10PFXFmGu7L+QGhzWvsMa1o + ###p68JqJBhOs9CtDhQxJRprsd0FIknH3NKhBommiISwVOHkkJFO0NF/JhG+kz3+DyKr0 + ###ibJ6SJCZgjB0KIzDE1pBMSilgxTfPvo1PmGfL82/vpVO4cuSh8kaZFTIViRYlE8YqE + ###xniiPCVKPXJFAYq1iiNKTKLUFFFEIkUTWJlg7cFhOuALLWgLFQgVJXBlfQdqjTu8vE + ###m4TrT4zAJyJCKwK0JurFamCKoRrzmSPUO1Il1ZZ4Faa44ss1AtNZfXj89raK0tqydQ + ###0pbD68KXtdEWmShkqUcwnwUZllwckU1ChfIu47EvuNwWLA4UJjuEn8TYI8W6hTknGg + ###OFwcaahQqTTASz6vEpqkKnov9+JTZFzpvIsCUIXwsYdTxhT6FgiidcJhR9lXkFcQeZ + ###el8TeabjgZBqmVdfKC4TVSKjocygJ9QwFLlbaFrA0+MJaeI4AnLiUEiKwNsXyiDg9d + ###UCF2AGvExXwfHsfPe8ow8xdPPwLCWWz0UgRPm2Uv3LKMCHd2HV/a/H69YEcmAACtul + ###x8X1kJ9/JULoMDI5DLOQgCEGlapT2x+pjkGvv5zOF1hLzlBEifyk0koHNgp5HgYftw + ###4+7qfCx+WzXkEePhXgiRg694PlXuCoxv4ewPHqgON9KnA8Ag4ihgkcrwycB+PMvcBR + ###jf09gOPXAcf/VOD4BJwoDxu/Yl09ECj3gqY06k+FTAFCR/t72cEr80BWKWFVdJnxZT + ###/rAR/AkpgX90XciDgoh98y4naEvNXLEUVwP45Ce5A1Lg7UTi99+bwN7HMW2SImyqvD + ###hbhcjo2fkWz2kl1VxReJYjancYCQiLeWeccV1Fj+IrufF3kOZSGjNW4ttSxlz/dC3h + ###oOeUQhqaxi+texTnhfOiTpnXcJ4CtmRZgHHfD2OerXmIU3hX1WG3wOnMKWAw8tMRhb + ###hXvGgVp4mwK+uC9osIMsrLzyjgZ8sYGabfEeCqJrsvkBXxzvwiEFDHQDqsyhUDCgcl + ###Bxh3eT22Si4C0VH8PhUCgYMhyCUM/GIw4ak5DyAFoeDhqEbioec7mYvS1i9qGIYgoo + ###Q3s68EXTCP2jAiHveKMXGmQJydjiBmSdcAPeHCcFHuBA5iaXDGjw5andbvqK2HaH+w + ###2+K0YukqDhi3fcHbZh4i7lmmxW+U6bQ+S0Q7Z/cBQd3NhCuxaZmZyEBBEnpi7xJhh8 + ###EdY5ERmPHArsIxtm8MXlECcgC5nfZXPNd8ieDV8hf3EWthE5bO5y2KDskEbAm3aQxa + ###E9AMchy2+7LbYN0kvbSZss3AnZJdsJSZDsDAdfZEdrYz8hC7szsV8cfLEjTsBhVtBE + ###vyYucvBFanbb4y15ss7zhiSa0kkLa1NIJfgKeaeExPsE3aFAfKJQTBixiOyPtNEJXw + ###HvEGCcCfgKlPcRfZEXWcJuTQnaX9dkAxW+OAoS7VPAF+0a02brGgaAojod3shokxbC + ###G7NeDM2j/Y3iOsG6IWsHb+ICPWK7dIiWPowxRGm04Ytbb2yBpa2pmMLFyOYwdIE09p + ###j3LGIn4i/c8ADSw5s1CcEzSgjWvOkMFKjNEbhoxqBxMqSRxx4QIjZD+mQGjWiHSZz3 + ###gB6xyYIt65FDg+aNb/ji/Ql2jQsT1q9iNqvJZmNEKhEgJFlN2bsv9KkvIYeoCmnlqM + ###13dnQBOkY2laBNo5WN+oBnM4hj/qLz3LKpH4RUdRDQBAQBG0PJCA8Uj3bPAgkh4Erw + ###B9Lb/TaFvfK5BT8hnBDHAj+iynxEWsgSBsoDkMwErEn5HMYCJ2dNOyw4XM4hQy0gtv + ###JaQOWO4o95zDs8DkqlfAm9gKKkeQHvxXHV4lbo8T4lDIFMbw7H0WAPQ5ed81zalYWM + ###FNhAnA3d0GOzQsB2Exo0+R1CFo4y4rJBGQgSqUTsgugksUM2HDZAU6Q05RDihGTod3 + ###D7Es3mNGhxHnE44oLDdToOIoM4mgBN5MhmMW/oRBzoBPsJWUIyRbbZyNr2uYAnASZi + ###qsXh4+3spcDOLhg0jUyPsU+xGDi8GjvGAFhIZU58Pq+OhHpNnGiAZ5BxLXGoeMyuvO + ###TluObG7McA4KSX7OXADo/AVtoUa4E2Q9zYY5OYxIdg/4OoTX2JEt6UjDm4SMS+GSEZ + ###uyPcflkTj0ggJGx54FPvkZhY0TlyDXgUmcrChMzfsLhIi414jzKkHcGQ93dC8nYRJy + ###U3ZF+QEN250DhNqj07NAFvYztmJPZVinbCzk9uQPwBvsjQGnCQBHKUwgP4vL3cZut5 + ###wjvqMW/9IGqswdLy2LrE8WZ8DtnCJl4fzWmQxSGrGjtrASay3zWJWy7SILRyETl0vU + ###BCa/GXx19opUR1gU37bd6rSfgr5pcRGjNcAAyZUGRjzpf9Odlw9TnEi688SMhUwpvE + ###sewVY+gfcdt0Hdlb9dlaTeZG9uCELA5tpbRpuzoh9wMCSjtCc1s7RBxp0y4+O8y1Ca + ###ptsvgm5CPIfnXAptCyFKFNJAlxobP7XUIbowkx6YRIDHnprcVtckIhh8WYfMvYmQ+4 + ###SYhmPjJL0fY0+/zFZD6MHbSKRoRX7BoYxWjCiShOXhQgbWYPwog27iKyNUcO9oFcQt + + + +Valin, et al. Expires February 17, 2012 [Page 148] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###eA4JMFChdZGKEgwa6hIW7+r4W0ZROSiZhdREMSGgJEGzQSiD8LbevQPjM5OeAiXWOX + ###0cDlWFccU4JkZnQdXfNj9rYguZl9CdmFlHYTfd5bZn5MUPUS4l0oFwJbI4mFHDQ99u + ###ui3TMMoIqkUAzETHWIvpAxGt09MY4J2VUpRgVBhr1CXQ435ODaaqOkxzNBvj8Y2DEk + ###Hw+WbckeH7DFDy1RhsqUU3z0nWgYtNOwIHjaxuKw9vWMFDelyU7fp/NRb0aaM9sVJh + ###cduvjNeJUOBtm7XwEuiDJkIMV5SMiEz6rhbJ6m49k15kvxtrtwvOAadHHWQce928Mj + ###fEykzbPr6Xx5BBpbrncL9fYMLx3ABNVHuurgx1QronS/bHabEeXqFfJI6ENKw9/4To + ###cgpbf8RKOEQTmkGv/6bZXhqmVVvXarX3vVr32EWklNZUDiW+oHOUXkoiC2cjHwWrkA + ###QVyY3oh+vQbPh3KrEACEbyF63xuO6IoHivBKQV9Fuz4/Od897B6d7HfOLHcFhq3LCy + ###N2cRcvLnpjFGZF+9sSMpKd8R8diPcf9FcV/5nup9zsf7E2auM/A2fz+P43EBIDlPD/ + ###BMoasLSv8Z//iL/8/W/97FK3xNo7Ozg9Kdz61r/n1rfK7Alnfz5Pr/B+t6Pe7Yd0NM + ###KsP83xzrUJBpMu3DZHV4wVSlhfb4H7egvc11vgvt4C9/UWOOMWOH0zGwzi2cFzvJlN + ###R8aHxToYXlG0fL2Vkd3ztrymG9l0bub7udD6FdH23/+Sf+5/mBdy5G76fLT60o2sFe + ###jKdLYqqv/DLh9e+xUBCpT1Zj6h0PShF4JUiGnWBmq3ftsJQMR4svaR5M9zJGrwfw8o + ###2qLRtHozIEG3wzFTKRg1h7tcTvFicBBr7fS2B+IvUbA7azbqLZGSblpPh0uLkibpYq + ###FvQSCSma8Sm8ObTpe9yRLq7PeIYy2ta7xkYYJpUj8SP2jQvAcVplrEXsMvAPJQw10c + ###gPH+VmBh3rg9nj0xX2Euj95ACl7OglrTRqORFWk2bpvr8K/Z3NlxfcrKt7UsFul82Y + ###BiW9u0O9WktFvc+FSt0EODUu1brwngfwaLq3v08tCNGregOjTwOKdb8T7x4jj/2o5Q + ###KYZa8K/UjVuPexFxkpr9DRzcR62M4vXWGligZHkwBXT9+nAxnLToB4BQoEZXfvef6J + ###8L+jnqb3f2ugeHJ88blJdfLrKXUBO/xOStrW03tFUtkCQvFmYvG6MFZNnact2m3M4N + ###fxvG0Kl3VukFnjyPEahxG6YpK2qbOaET+aL0Il+UQCQE5NnBq85+98UJ0NQ1EgnHs5 + ###ulCAbj2Wi4xCXZWPwyx3vH0/nVXRMZfAo6Hd8YAhirlGm6Ib3PFdBV93TR/NUwXVTe + ###lJ7dRw8rzlp/1SpcTv/OuO0cf3T31G3s2XwNoVDLOmb0KLrPrIuev22N7R3+bWSky9 + ###YhDZn0cefwrNHd43k8hpdH61Akp+9zyW3nCUg11q8CfLy7pDGEl8Mt6OaT4caGmpZf + ###s+nBhn5+kj2rTWFYnePeLfzAa9+qUhc3Y+gKJGapP28fyajeDN/musJ/XCEOYPeV7z + ###X4sWW9evPzRn/9+G3zyUNy21XZP1ofrvFmmMbGxs9bWSc2XMxlDHZgST3WjuUYSJrv + ###J91oTzv/2zzrQ1ydUrJpu06+o/cNG/4YWEe7e27UBbSHR2Ctr4i3w+OPZz+cwgjVwF + ###rUdrPZKtZS9XdvLQWo1kLKzAjL7af0O1AiepeXKENPJ6kFsjFddTnuvQNBuDcGveYG + ###3nxIrUn6HhZGigrPTC7csWbDJazD92RUIn3lu0VxRKPe/CqlxIl1Mxku70C4Bz0Alq + ###uZC5cbdLGPaK9Mbmg06bw4Ayp3vCEjB1B0jvfhBy9bIAoIaICjzaDI4QteslaYp3ua + ###MYtnPx+vz+aAL4BYj/59YD1qVdfSfKKHRGWNWehvyco2avqvySMqwSLBMYAEdE/oLx + ###E2pF0A9/51pgMy7UNWDrO0qandRBUkevcgOgdcANUb4PiDefqLED2ekyzpVa7cvxJJ + ###HBaeLcv0grl6UqCLvIYq6B9k7hivc8Tib0QsqtHAFplF1i4UEdytzN6ySoh7hfiolz + ###y1N+/PGmc/HOICaPn59X4fZVK0AgH48vCciFP3r26oaAniQI6c2G6zdfVgwlvKQoyI + ###E0or4KPcfIiEx2D7bFz5yvn/UM7P7MpNbS8eGDmo2jxOFSb9yc9ZU7I0oKqNbY1p6+ + ###qHUe0qupsn40aBrzT3fwwyIlVGVNwcPG4wPm6smOzfh6YGJTSI3rrmCNUY9NG467JI + ###tBCL9lNb44OJNCBCmTbOxd0EvhZ4veF8OqZXKAzZkjtPyC7TT0OxKkRajXr/IiiW6d + ###peY29rG3T0R2W4NNFSjAYMvlY9vSTM2PHwrpDJBHjNo2YlwlaCRyFCDWRvVZ6BYBHi + ###kHp3C+9emS8eviyIviHTuqym1rhA6qQId7VIkCPC1AQB3VwqWZaS+LA+2NigtlH4EA + ###HC90iAWL9tWVfNlldQKm43NlYJD6oDzdySywClewV53gLQjk2QZZ1xVkoXyrg2m4Ou + ###gneKyvLqT0ej3myRUkPLeW+yGFIyaTHjm9FyCAjE2+vkUJ0txd5kOeyq4pXLMEOTLq + ###y7/GU166pkd9xbvFvwojo84m9ZY3vyTXf1Khl2QtvJ86WxLg1yuQ7iZyf/Bkfs0uu1 + ###PPKoRI/LYHXrsxsQwhZSQdmSiXlgqcOCB7x8R8CWCaI+FbD5V6PPx1ptNppfXsPyuQ + ###ZBF9h8131iZL9MZ8vrJ1WGIAMMLJ4rIzInHDsmpSEkto1HjdGAD9QGyo3u4wRNcYtM + ###8+SkbavhbjBEoGTzcaOm3q2twyO0NqzsMY81k7VlqfwVNzFQmnc2wwG6wDRb1tHBMS + ###wpdrPnpc00+XbmNWxYb5CbOoi+Ljad1DoDPddtWpn4X6HioMXVWH6osRw72O1Vqgzb + ###PZZoay2U4zUPKNiIRbve2srRGZ5QVdGcHnElNJbGAuerzgvQASisG6PddD14QaPVJS + ###sqb/BImkVsEOJeBoqxNl9VCx60bFYneSv0Qmh8UJ00L+iXc8Wy/pbmrGzUMIxOr9s3 + ###OYq+kSPc1BXJ7N2XGQ1ge1t7eytNX6rpo91XgGP01Mq6ka+3QNtVR7KiXivr1Oqihj + + + +Valin, et al. Expires February 17, 2012 [Page 149] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###GFYAdVVA7DhkWR61OOuaii3LrT4he161HgwSW3OLhrXirEm9O9dW7XJdft0mLkZmDp + ###mZ0x0DqryCnMw+HR9rZfbs9UxIMGujs7ih7AA3q2znNtzZn7Qw+5n4qizpt5xj/XUk + ###Je1ee1RPmVteHf8v0HQjm3JsACFrLtJExxyNdte+i+4K3TIvSaSDhxAZLFENiZ2lLK + ###K4XETC9G0/67BSzOyXe43fRehOHeWMvJvQWgAtRk2gNpTjZzJEJN9f3gXUdVInADz/ + ###XDaFCAThF+heT5umJSQmF06itI7aJwh2x6o1HBFHRW4pXvYLW/23KJ8r7LCTH5xUga + ###xDLtLzMZpWAZxYF+08gLEm+G63sb/bffQv3vmnkAlOzSqLYMRyOWdSbTYbkFS+tTDm + ###hRwMNLqlNVvfBHO5zb2c4oyRBPKjK+etP4mcC08Q7VL8r4rXNLl7T/GSD/vWXPywU/ + ###Fl8YxBQVxoLVu5LckInb+hmdTnqX6ORBN70z7oFIMmXDNu+2zjP1IgcinAGj6QLCGT + ###oJ28EbIAYyp2pZsPpOjjtVdjJtn/hobBeSyAlsIwUpcnnXXSzTeTq9R+p8lXt6Xavg + ###oQB+sM+/j03dDsDJaU/UK9bUDc7WAwLS84pvR+kAJATy2ykmYYdWCXel7Re2qPI2EK + ###s4b7XNJ2cEYPtqtjyxA0Ub69uWYVRlf7CiFTanPRm5CYp6P8DaMCxUaitC09YGDR4/ + ###msZLaq9Fn0LEe8ht9w9+BGEQ0sWOqzYyqHjLDZotbFoKeDUFuOZCCXP96uWbU3ZpYP + ###OWNVK4iNtur978rEUHpH+vjWdMK/EqQIIR7uIW3nqtbPnCijsbApqCGoa6eTpB5zPQ + ###XyZTvdD6vVH/ZoRHdXmZlZYAI353gUbgRh2uFxH5598DjTzT1DL7ZuzErhPFyaBFgj + ###sCpmlC7YHlXpvlBLqjDS0wvuY3c3tUTRYEJmOgXGktTMwzv8PLVTAyFIbb2TbIHwuY + ###NBFRjbTOCMSseXFpQ71e3dJ+B6Xezc1lauonAParHvoTzPGLN28L9n8azHRgvdp4Tb + ###5+r+zXKCn89uq3/+sB+v32mr4f22h7btzeNQWRaif+dmbuz97OeCYL84JQyG3jwjNn + ###MTN+NLoMtBomCSQYsi1A38eZifhv2odGt5/TC2l+bmfKUE1FyQyNvUDvTtBb/4rHg3 + ###AlwUqzRsN3KcgimOe1VItzoeU+qlBkwk4OpzHJa1FuXMDUgg0y3S07znTm92XeyDKT + ###SD0HeZpxHdqNUjsY4EmRpvXbb9hyZVpuOirnKrcUctSJPFcE+Csw790or9R2RlqrfT + ###cvJM05KUNQg0Ugzjfejew4U3gJYVdrumbhORaem4XnNYVXLaIB9gCgGCuw0OBiDf53 + ###81zinBMNvfgzaCAg4O5sNrojNFz00Rf6yqIVQN5qo3nau7yjBBDzMgmpTDoJC0tkso + ###K5ZNucLwp6S0NIxNnLp/gA/AUo6LvRhqGEvb63jjnXsbu/b9Qx13V8FJPhftrHMX64 + ###Tskz+ANZAm9GAIMZDpkWNRuIxLXY6t/MQe5DizpqMgAJkmcoN8CsewkVLmDh3y+5kT + ###kO1KJ57ypn/Bv1FktdjWS7HnRVTn6xRIWgmO1mdgmMtXs9MKt7iGHf0aKfuP0A1bkg + ###AUm4wj22/PKeQGY2X7E7wDZA7r1+AcOEDmyL1xFZ+qq2CNRCOFpvGEZjO/ttu2+b1t + ###a2lTRzJMQ6e3Ha2d3vHoNc/jv3sgBoLfQ8zBl2MGXZn95Mlm98OvXjtOC/j0aO6o0F + ###2jsw7Pa4j2DWy1slDdMyqfMW9eLjre0kr6XA5ACPukmNjAbHnU9vrq6tvf1nyHJ/u4 + ###V19VtOAaoh1Xm10BQqvOMn2MZfXZ+2ysxskJbjNnnqcUvMFj9huR4X1EIcHhZX/IVs + ###ql4IIpbfLOmsMg/O29yWxKpanOieetwH1uOG99Xk5Wv6uJablpMJ0GDljDyY3syJHM + ###geYSOx3v3wNz53MmuW9NThjqHZ2AVbFy8t3Kv3vfVGNioNp+Zj0wVKHHS9dd1ra2cb + ###ZgREgeylW/XSkZemsZgbhjrXvTAyEoTIZACp3odV613Tt/zmA6Tw6IwRy3AfA7Fabw + ###S2aWo0N6EMworDNR43pErDNi51bpulnhidKBLl7W2v3COAQ6AKkT9MdUmnXNI2SmZj + ###tnYsz2ymVJVXak0XdJO6gq5ZsCafY4rF7G/RePTvlxb9/1+TRy0ZQCvPxor1KH8OmT + ###ZBDSUdn6bAdxfD93hiEysYarMhTwn6kGwobqonbT2bW0hXdf1wR/oUbsjnqvDXaYKs + ###RqPh2zkuDPIcOTBHAX56UL+npTEss2UlTg4nVUEUzpnn7D5/jod9Dn5kzvMxmw6uAB + ###bGPTUcn5we7R5Wl1am7dWlD/GAklm4riFhjx+1hPryP/9TTqAY2cnu1/zWuWWntxJi + ###cPq/50w2wogzzp9J9Eed3bOXpx0aZ/forLO2NhhNeyCvnHXe+Bx/EHkpMtnJBbxUco + ###XD7+DNHrPeLK+4VNyMZ8R0u+NF2sBXpgSUWQ2Y8Wd1l7Y5M7ekK3RLwo4N3z7WDQ9N + ###DTHveITDpL6M0x761GbdqRATedgoIqpfjv6JjKCTf3JErBNtX3aWZYjGWYThZLjU+x + ###TZ0MnGjGm5oQKdvR0uGznQaaopNbnZaA34GaS2cp/45yfGQ1898ICuTPrGg0Mju+ug + ###ZtnYA4JqffutpRJyhjxQuAxiVpR5ioKexa6WVFPJo4JckdxwQ7fzAF+k3A40uiPld5 + ###LLZnVGHmQHjSvtNWe/cpT3+3r16zprMteqcHFjey+bn9yCMWco83EidegAz9UjbV3S + ###mXgcHoASiChbOdB9adKDFdwbWT/0Lnvj3pyMetP5ZTq/06+wRXXQKV0sQFsa9kYg1/ + ###ToRBP6Z8wXKZ6z7d216OjRdIbSJ4yofw0q2HfvUzbYYz14Rgk7QDRHXD+pOX2YCXS2 + ###D3i4CVP29yztv3cJBIqUOnQ/J00dvUZTYB0TGMwm9DC1QM0FzQ6tLTjUY/Q0Cjh2fm + ###Scfsq0Hx5ol6Dzhg/2y3y6LQvUJvXk05OFsRYhRb2N5S00QTmiFpcLKafkQpMP5YJe + ###WDEHPqVopy6XxAgYVKrNNWD0EYrp6FBNFOjAtB1epripMB+lwAu71zJDjbIqeix0BJ + + + +Valin, et al. Expires February 17, 2012 [Page 150] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###WSS1EzVfacxsgL+Mfd0/3O3mFWEalDTU1cWJg8wxOCZ+e7e3+hx2NySVjnJujN7uHh + ###yR6e6yKFSlfW1KQp64JBR7IJWRfU285NzQa3YGvZx6BP0ni1bnfPXhj08w23AwsMdL + ###QNZauSIRm78R8rWG1tLx7W+rCm1YwSV+hrYnXBOsQUA+LI+cmpnp6KnaivSPN7p8uY + ###IpqyAvJUyWN/h1aHZmu/F0kIO657vbl7Lz7kDU2MAseOtbOjZIfasa4cqLFesx5An1 + ###3CJtNvB19+yuYOd2LdW/+54MSC9X5GRQ2syW0WKiu0wwDHc6mF3ldUo/LaubwfC6dO + ###1WGIX/i8qYiEF/w1HQxASuffZNnEeDlq1nCbKS85lkx76JPBCyZ5k0CH1KTIVY0YQp + ###QuieCIlC7dJCRuLhinkCM2UvhVxwmSj3rt/zJpWb9cZKTAI+ecY9vNNC3qHkqAx4Zq + ###fezZttLskKXfzGbA80fDMZ6QnqCwvWCvfozuIUO0aHeR3SLgX7rsbW9L/0H84CAh+N + ###cbfejdLdh5JZ2QpYzcCGnjGeNF0Y4myu1QPxBLhNREDMZGKAr8Q1P6E44/8WHIR7A/ + ###kKFZeXfgLtykTwmX03SBTjNX6RKjXIAktCma6i8XAJWDo4PjxoWtJ89uBFtb4iXYAr + ###l549hb51luPj72xH6SlUxUZoS3YV355WKr4ao00KCbTb3Sfplk4n6eWlGKiRK/XIBC + ###GL/d2Wm4gQ117uwo/8UnZpHGLxPAaGhla8tQI8xD1pBta5vU4ieG4vjLJOfsO7iZ9N + ###Uxd5joGSDrUAmutPuMYivay0DhlAc+7IEZLmA2lFw4nk6mvP3GCNLvLdJNq/M+nSi7 + ###P+XA1y2coj7IpYxE6iwSI661/MD1kKfxeJg7TIJ+TFA7zrKON4L5r3ujgc1hEKwDio + ###GC1V+kuFk+AkF5rowfIEMvpmIMxCxyIPMixZFxd6ALiTXrzZeLTUOC1a7Jv9yAqEwO + ###9A3eHEDsVX4jOS1UbQ+s3m029Lg8ieHdEP79VGpSji38uBx00Usf7UBGlaPpB+xZy0 + ###r73f7y1lpP+zmXZvZWXp+n494QZXiK+5U5Vpdr6k5vltVOMZfiDz0CZWSUa0R8otfR + ###Tym3oc4bShWNLPqgaPSvucLBcDQSCsrtFr3CMSBZRvT0L9xWovFkWzGEiS2e10xpHw + ###8vcct+aOzZM+fdPs4euk/zT1m+p872U/2wHI7T7uXwfb4qQLfp+AI0I+Md6GDadpB3 + ###Bij4DxBQp5Orp+T9R68yCNDWjph7gCa8Pj7/IWuUjskwndEeivmUbxhdc3udWVuQAQ + ###aHZkuSM7pP0YzIY0UIoBTZfcqJvFS21WLftl5b30Dyy8ND7ZFwNkv7oLXSiidqgYR9 + ###gWcTlecK7bZAeyULhzZqGLhCezw11gg+BXA12S66kRawfWdbk+jV59uhGEPqHvdAbB + ###D6dfvGebtVOPQOf7AIoRZqtQELkXJrBwP9V3nUOqsbKgHSm1VSKp57KgwWTd56uPly + ###F/Z2VcrHPPAEdfJgwOHi3GMH/2zZZG4829s9xPA531vmo1Exzt/rSuOLuyFik2m7Mu + ###iP0bjxlvvAjr2v4KEVZPvlEk5E2KJCtW8y8YeIlrW9bTkl3Htn9kJT2R1zO0EvbxQm + ###VQ5VDDAfDUM6E9mCprgjBSQdV8I8/eUG0OIOl+V0dKN8XMpjx442srbQgNeABfit26 + ###SeY7Jufcsh35Gnzk5mxSssDvP0YM2epAFlIcvibMUvDTeELGeWrMpkgrWpi7Bfrx6S + ###6dtrdDYnN+eJP+B019Cr2YrkRm+3c6vHabn0n9fy6b/Ct4HsBVJRteZZUUOv1J2ddy + ###2LnIYLxWTsVeU0Q64ujbwOrahVw8I0kASfvf1tZfLOTvB2a8vQYvj7KeiHGZCVlN99 + ###urVlvs7w9YBxkzAVBSrgaQXk5KyyZuuQsAL17oVrFyScp58F01JJgudv2/QNxM1IeW + ###rB6HNez8jfMkWa/wx2nttj1kMsbLRixUocsMpc0pKdt+n8qjdBv2vx3wcWyN4wCGm2 + ###xQ4B2dFdZjowKAQnafgjXGiFPxzK1bZLhvrOjsYGAKOztWU8ZkLBgyamuhlzoj6xsY + ###8Z6UYEHWhPc3czBEVizpG2KCzKh5QkeTkv3CooFaJRKPWPo9mSBZ9+bhKX3MieKS7u + ###m8bhEShXVceECozk8AjlHtulXRVrh+t/w5/O27cbLu23HO94pQ33w6Md3pQ5hrVkbF + ###cbk3pcws/X5OhiuhkoQczMBZ2y828Ic5Skpf+E+hChcX/jNePm1gyomU9Zy6yYGLIo + ###YPMlHvrLxNyiEvuAY74bs+Kx4K9LEPN6ZvIvFEPNfKN1dfMl6+i5N/PhVRdHol6awd + ###RSfJ2tS/Fck8htBsEDdn2FG+XwTQuWQAwaYW+cLmk3BIaTrUrdM0YrDAaNm0cwwVrO + ###1J2h/iJUdSE0E1i2Ms18+y0aZkCo+uv5D53z3e7Js2dnHbyh6OTFD7tnHZCucgl5i4 + ###BhtAJtEjRJZagyjFQVklaGzMOdba1lGphi2C6sKkpjYCxAlaEzXHAkEozY1lS7TnN0 + ###6AVde/khTRnoDX0upEBQ2IcXli/oR5vWT6jr0zEUskPpqWipxT9PbfKs1BYJ/ZdzCj + ###Y2vN5Nph+4NoA/dOWObVQYVoD9p8Ugof88yYZbXdP58np6NZ30Rpt5HyIevFKLuvyM + ###5PZ1S2ujx80iC0HEZEkff3UH814fRP3cJP0y+Wb7U+i+7kmDf63/MtnA2Oq4lIMneY + ###+pzmQ5n87wnDefSuPJAm43Sjfx/A9CrIeQoRC0s8uBctbOtUi8jJZKi62EM8qmRo1z + ###0LOW8yHUezPqsTaonL7RkW+z5I1lWCt3vNW6GhIH5Lpm4CB5jzoHj78iDcv8MnnslZ + ###PoTMzMWW/cOkD8gDvcFnQ7ANpLAgownYvexXCEgbkAbtCPmxlJ+0zyEOIq2u6E4Oha + ###vcHS5On101hSClmlhHyoC95ubd86f4aO3n7fuLVd+9ZpbnCf12dOltq4hTeYI5+ej5 + ###tkrVZECSSLknY7WGyzbiq9KdUn4xostnSjJZc++LvdHiwezyq05+IZUZUdK9uAau2s + ###2irVG7Vm9nf7O8DKMpbYbQGMhn6ReRmh3IbsXghw+SDjS2N9PRA7LG1iQJMbWQe4Uy + + + +Valin, et al. Expires February 17, 2012 [Page 151] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###2LjMP5flXBU49BwUvVUyxfiRuMGNtuy8rFAIM/WkENoFrI3hCGxu8nn4f51NjoyVoZ + ###DfUiR3O3tAMsVN5twJr7HnkY/rAryQHWMqqtZb2R1YYk1Pq+hJkwZJuGnGsIRk5vvO + ###wNVlweRm5hQ3fw38ZggaB94DJFi35GXivQSANxu7zYKGFcBstY44bu2rKi97TO0Y1O + ###zbOecAWxsjdvaQBWjm3hSQ/fayTrZsjg5mBMFQI03ULQhazPBkJsFM+5SpZstoszW8 + ###peOkdbtY7qx+IJErhV5A8Ro3qsDUIpGDEOlorXDvk+FFfj/kRELYHjXlJbj71rVT8z + ###WBmRjGWCaFvxcaZSWCbRQOlAbbrq5LIxV21RlhlQ6bzwuGWxvKb2OMpu9FUYkDt0yR + ###XkiuVPVZ+f7J98b53q088od+mDaePe3bp1nY5AgBreppf2bIqrs8expZfWe3S8uB5e + ###XVsUabtimg/T5XcYNoDlW/gfc6dzUhBG6JV4l5EG0xG2zJoqqXORCbzP1tsOXeBTpv + ###CQ6QHk/ecy/am1U/KfnGSyX+dNk1Zx6X7yTBdM4Rc7nlLoEOuKlvYdy/vsfQXL3CvA + ###SNczZuaT9y2rGCGqko3THGQ7BVkVXpmJV8xebstELUX9UsGBlfIKRQWdKdJM5b5A64 + ###PS4JXmq/RysTeYuo1qcduqtB+iBrfNN+qa3ZSzpmbXqf5vMSQRzETTNkklWRgQS4ia + ###PCkjf9aJXJiTckecik4UO1fsSN4UqfpS1ZVye7lo8UKZK7qQy0Y12+XMRvh8ddb2/U + ###J07SxoPVGNMaD2GPRySP7lBnTeSyudz6fzAvJwXlw/efVNDdGIZH6MYIhb5XjudEgY + ###B9s0FOPVQWkYKphf5RYIUEX52Cyct4HBEXGKkuZ6RblcsqrDjJCUu3RgUdzVPN72GA + ###pTPHj0YTp/tzAUX9b+eu9SI7Jz7/J9b7LEQxWiauMd2ArqhSPMmaUB1UqmHVlNZJ2i + ###05faQIJqNcB4M281PhbH7zyrLGwQ9Z/kn0u7qeZurNey1u9MSk8WPURE0zgp75w8Dt + ###IRLbLmSm+1IYAGUzqVxUvzG9luyB4rAhKpFqu2NsdqR3ShvQRkXDUMrGJDlUnbhtSS + ###ZaXrE/qgM7wGhcMMmXWnEl5Bwusn+dFRNb9/JxpP5aQcanyqwatRBhEXd2tXwlmgJ9 + ###vZ3hvnLcwuHk+z8cmlJ+ctCPj/+F1u46cUdm1vHX/msUwsVxnnoeDsJZ/3KTmIaaiA + ###NHCztMzgRTQNFS5ubDDsj1Kijlh+NP3A3m24iQMt5mliH3Upw3tIeQ6NSfLABYXuE+ + ###SQq6zj4gXEHkDK+8fw/DHcfVpW0akHHXpyXjxcPfvrWOycwx45JTccDbNmCaQcjIpN + ###4kj6yJWKYgHB+PC0wpBODLgY88oBpRC+egRhW7npFcP2i31snn63MMOcACUFObd3AV + ###0HskhHKrTLF19CJVFK81BmPAVGjwixTribW4mI0+y6sE5oXliNZX+HPMbm3GXzKPqK + ###G648zO8UY8G94n5UZi7dNPC6qmYVW6NU9euqqlXuUt18TPVVHhLZaDiCADqKV7ZEeT + ###hCwIo8qn63VL9brL9i3G6xfrcyMl6ZuACyPuIQ1Y8EWYkM5tZjxs0m6S0KJLQKvG32 + ###YrovH64pt5iXjtZRJlxl5ZtBeCNqnl70Rr1JPy0Y4p/jppPa3KRYctCWCnLMkVVpx5 + ###P2Idj3NXOHvUwX6fx9mXuS4RHYprFpKRwVzx0OBoPmAzRn4YslrQV3t8mpN39lEq56 + ###oF122r/GuzAW74aFGHX8x1IicFT6sbPTCOx8MDirWt2hw/dz9lblmHtIYuYfevNLW7 + ###W2GE1nJGDhhvHlU7wh0HIda7xY2Q9x7nVkOxKPsR5nzryNEPvWXKEfKuHn4Gj3FdbA + ###DsboSmxTZc3HXq6oElMu7HFBFlkpbxSvaTGchL4pWUDgL4fTmYPOBgcW2PE9GwUvWR + ###s9DtpWltIEaXRww1lvgfHcTcayaZ0oJET7c+EOE8DXS/TANQ6VVe/zrO49rTTDxQge + ###DYCVECRbf1gGvzdcE3h69UFyAdoFZsCzuiMCY10UwoOJgtSYePoHZJQUd6hHMWF6Oi + ###KM7CmjoG+IIsz0JHQT74cWkRRL4LpCXooVYQSw0j5SvYzx6tNFjAp7y71CR2nuqmrh + ###jmRzpSQSAeOfJfgfCMwZI3sBjIwkFlQWK8SWosRSmGyR/5HJy0u7MP8VexNZBTuWb9 + ###p/mDB+U2FS5MW9sW00Do36hjdAEX2ekZRknqxoETaQlc+UKEknlDMVf0vnUxK8JtNi + ###DxSOfMAiFyS0Zd4MIAlsVuDNbzWI89pAnMVnI06OIq1GH2rpEzCmAj9wjE3VZ3aUe9 + ###rc2kJeuON+y3C279/f+ieZmf/RE2Pl1/Di77KGKwwJlmLqdeu4gCz/RFygbjX/T2MD + ###WksgultY6QWT6EVvMewD/O28YMR5f2E768LjeGYNBieO9UK3p0+hoAsJZfPIqJHl/S + ###WLnVOW9YxDLFkHO3IIT5yd+Cq5C3aHgi7fXOIxt6KXbrHyLbae/WJe7GeQu2L2je3C + ###gRoBgRwV/PTB3jtec5Is8Xr6ptIvErWsv0CTMOyuTMUvzYIu9Ww4oYgJl7zSev3lTW + ###/EayIfWDJrrcrORuS3N7rqUklynG1Zf8ktGMR/RMfa+Oa6npvJJ9RUqdceDExzCY2f + ###cT7zee1N7oAR5QdY2F97iLHDOHZEkbOLBO+pOmWHYcjxokL84UbE+ugiXQ5SPKYYwn + ###jYc4AWMopHwRfyFgmCG5FSoi7pfSKuZxTiHJ0yU4x4Nxhily7S69774XS+WaJ91FW0 + ###66vuNxvuy8PSjpCVbdNUDo8cffksmvm6ZMB8yBalnAov2E5X+lsZ2t02H6p6kPME3c + ###pVHaH8gf2sqhX+1ouhytdXxirPBpu7k5gL7Ox4ZfOxVeFiYcmCqZwYazXkLJHZRhSr + ###fJb2l/Ob0mWZ/Pc7wGHezlI0Auq/T4MZBg8lS2eQoLHiIh2Rd2pqPZqIEUszfFJsK4 + ###dkKWubPlbvbjqDx16Ip8krfOTMItK9LKw8vv7eslcP8FXxWNDGirwrZ9fcB16de0WI + ###+DLNtSp3CfIHCYjVkyUQvm8WfD8DwpkdnOZkjJZXQh0xypmdTvDMzaXspiiBq0hDFb + + + +Valin, et al. Expires February 17, 2012 [Page 152] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###6UjRoFl4rjb7YLtrRcfGr2SiBrcM4hoexJUXTFKPlQ3IvmK7wnCpZVIkn5M3NWiSW/ + ###K7DglxNhvnLoc67OwTD7vZrqiEjGORjcj1l1/sUqH4HRrf/eMy4VPYdO2dgXi4VgCY + ###KAQj0I4WlvPhoWOocnirazw8L895RO1ZrOAdlJOOO4Ue09F+WDStJa8UyTpYT//hg0 + ###q3xCzYEr06nrvoN6pc7dc1wvdzRoxYE9+HNuHacFHz5+7OHHM/jw8Z2P73x85z8r6h + ###DO7R5m2cMse5hlD4s9w3fP8N0zfPfsWZ5KlAC2vaqn/fHbVUB0Kg/0GRSo+ridxWej + ###6bACEPzZDW9+sx6niHwR46sPw967+M3rJPIpOqA23c1QuCPh2Gm2PK94L/b9l5yYh3 + ###NLtx+EjUkrF9Q6DyyYhArHHSHelj7S2x9nEXRYvwUhX24zfEA0hsKtcEply19CZz6+ + ###vvdOurrQCOqqOMUW6NqO6XzJRKcc6eESVJSuOjBREfNhHRTyeVafebRpuoSirHsbr8 + ###VskQsHoYM9cJwbkJSe8hZuKXZDKcZjbgurZDf/jBDWlcGcOapV4QW7ZFREvzLiVlWk + ###FmwDWZysLILDkf6l8Tc7VTbMYoJnR51dnYShvLs68gFITR7ITO6XDNBg5YN54fMRu7 + ###fIpXTIXgykgj4ccR8sFeVLQLG3ruNj56/QLkT/4kIlo0oWPdssbZffYeTwUqVyMUyX + ###b7WRF7grRQkbVmXXnkh4CnNWtBb1gDsVS0f/smV4YT7o45RGAbZLqF3aLG86GIAMOn + ###yv8WE7o1arbpM1nl6bdWnzWrZPrInNbbc/Lr28o5fyVu7UqrisFDlG9/U32wXF8TUh + ###a1WBvLUC85nb2hw73QydXlHFyiNskm7ES78G1Wbcm9yx+dzwwxEXRLGHg4BO6y3nxz + ###bEtUZzbgxMG2e3c/NcMDZtG0TSxnx27kjjEI99ZOTQrjpsZyIFygzy6zFv9/ots/zQ + ###ZHQXxa1hviuPf+f7ueG29HWaG2aDxt5zWf29yPvrGuNSpOXbb41JfGsf47amfkEQfU + ###uuAQVq99tvhQWIPvTV0SL0Ah3qWdcYblGgjHlaRNPhzjZyhMGAl3wFzF9ta5pRi92C + ###uGbmjwbyPU/Rgx5ZVDp/38MFbMGaRH8F7YWZ4+zfLbSvHAeL+pB+NzdNeqy98HV/Sm + ###xDXabgeFkAjvJhbDDb/2a7FNuaonjwUTEzrsIKlQtb7jINrEjIX4isXw+Nl0onTjMT + ###M5uX5+ks7S3FiIL+rlOURTji23DCjpu9wmZ+iTgqtC8gWivDvDx8AC/zsYHV6Mzd/9 + ###yZb0vs3VkTtp0Ve2vtlDtVaiHNBTDh+nOmwkILGxuqGDpElurfyI0BCTnUfsdfTrFt + ###vDvOmMTSFdJUHPW5/A2GXHZ9b6PgtnV3T/Y9O+eHZYTh4SxbamSlM8roEJK5ebAD5A + ###V6WKqoIYd7z5UzJRmAe5iBZRLa7Gz0RuPpYmn0lndLm1jNZDqxcdc0s+bmeVIeipma + ###YKw0Q3imrb3t8ln2wuL5uaiUAW73r/HUPEniag8KBnU5zUTxvJ+70WhxdiWudQ7zKb + ###C1Eea6qEUh+WLd6Yfdw2egi8mLDZKXTPXpY/XQK4YqsHvQduDFY+/TNwPLy55DYvyZ + ###hrNRTv5eGkRt5NuKrcNiA1SNATd9YsdR24W8S1ixF4iDN5fj3T3AeP33BYb3haDhfS + ###Y47kxwlMWIB6DKawbN/3tY8ttdNaqYkrhadBX3yZInbCNnLGiaRSuKIDEuF7ozCikJ + ###c0Ntr1LA+1Igk5cks/FREhFFZlOYDwr4jl586prgHjF48lt3Ufx+LJZZvstdE7aSxn + ###uxk7lCGjc0lEMb/+nr3x/0R7rqYnoz76ePR8ML1D0f03HR7hXaoYb9zevf3YYDf1EQ + ###4Lcbh475jT/90HX+5LqRG0aR53nRn/DuJtf/k+V8gfHd+3eDHNWy/vTzuD7ffen/on + ###+kUM/u+H7exl7T8hwntuGjbb0azq43T+ZX1rPpzeSSNltwtZay+5g9sf5P2pvYR715 + ###3/oRnZMqs8acde/s4PQE6cTj9XXM9x8DlB4LaEcJF/NhOgCti97lzjFPZynFAZos1q + ###giIiTp5RAtJBccfwmJzg3Hf2YM52254aQ3v0PBagwMgM6CgIyF39MbEivH08vhYMiH + ###GFvkjwdNjYfLJZDW2XyKuyyXvIcjlBIIHNJKUG0uh9wjqAXLjdPl90Rf7ULXyN1P+k + ###TbiGP0wpmny57EOO5dTPFQkIIfm7qWQ7TBkkljNEQb6cBoU51/MToELfZHveE4nW+u + ###6AW0ZoBD9UJCoP09OmLE4r6c9m/GoAr21Fw9xtiudCIH1en5sDdaZPDWZ3bMAfCwzn + ###84OLPOTp6d/7R72rHg94vTkx8P9jv71tPXkNix9k5evD7FW5esH04O9zunZ9bu8T68 + ###PT4/PXj6EljPGVbz3/+9ewalv/uOUnePX1udVy9Qm7ZOTkH9fHF4ADVCE6e7x+cHGL + ###P74Hjv8OX+wfFzEF5enlvHJ3S09PDg6OAccp6ftKjxcknr5Jl11DnFuxvPd58eHB6c + ###v6Ymnx2cH2Nzz05OyYBqvdg9PT/Ye3m4e2q9eHn64uSsY+EI9w/O9g53D446+5sWdA + ###Iatjo/do7PrTMQ9g+p0WcnL4/3d88PTo4trswcrPW0A73cfXqI+U5ppPsHp529cxxS + ###9msPQAgdBMnp7EVn72CXfTY7rzowoN1TkN+gLDoIdP76EvJBurW/e7T7HMbXKEPGBA + ###tWA1O09/K0c4TdBnCcvXx6dn5w/vK8Yz0/OdknkJ91Tn882OucPbEOT84IaC/PQOiC + ###Ye22ZFRQCwANckD2py/PDgh8B8fnndPTly9w9E2Y8Z8AONDTXSi9T3AGoOCYAU4np6 + ###+hXp41mYmW9dMPHUg6RcgS1HYRHGcAvb1zMxs0CcA8NwaL9Rx3nh8ePO8c73UwwwlW + ###9NPBWacJE3dwhnFtD7jxn3ah5Zc0dpwv6Bv/PCBUVMjcoom1Dp5Zu/s/HmD/JT/gwt + ###mBoA6Bb+8Hgf4mUkPcOJhkx56hPx3ofveHtX9jt6fSeyTE1tHNaDlk/1JxoBJ58n1v + ###dJOiO4NO0KImJfENPvN0ARXw6WZ1KsQsD/1SzesNvbOXjV7romk1Gtmllc1Gtt/YbG + + + +Valin, et al. Expires February 17, 2012 [Page 153] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###BAkVLaDW0MNRsXzSZ33Y1ufQ/IFw1Ak24mQOyckY2JfMmImG0CPcQ+L4CxLIkY4l4X + ###/iz3le6Kjri3u/v7uRtuoZOtsx9OG9CfFnSr2cJwwg1zkJgDk7/F7WnHGdBxKcr7Cf + ###0Pf3f/Q7P/Zz8c1o3BffgwQjUM37t/GL772cOAMeAwfNccRtVgaCA9Gsj9gzIzVw9u + ###RZkLVaa3EiC4VwGijU2OKXx/l7o+i+9Zo81O2bcQBC2tFu2Gddsix3RjteAi2Aw3Gr + ###cYKMlcJy56w1Pu5mf1RRbwir4AwMt9wdX50L4cp1eoafZWjhnoKA4Y6rfhs5kvtKpz + ###UAh7pgvxsHnjoFAKCMi00DxTMUkGIrZYgHhCR4gHfJsDZ24ZZyWXObJ3M1FOpUafso + ###uxb4sTp8ale5gDhvRw1Vi1l8VtcQ70yHfnIDOBCAqCM602m0VxmO/VcOc46L0WFcCa + ###e01rZ8dq8HOzul6+hKW+2sNStVtb91RrdHcVFPiu8c/u7upqD/PVmvAtdF0IH1XUKz + ###TF9I1l1zkqUSAM28upPcGz/nQFlg7WrJJBLP4wMfvyojhGfoZubDQyXxtaY6pPFCat + ###ZcLgnv5RRAOS9udXJJMrh+wJLrnh+xxwflQdsjR4pOEdByPdFZO/1+C0bNVDAduj09 + ###2fHoG0359P8fAI3/eO51xoRwDjetwsKcQEba3BErsGaKF/03BURIMaJDBm9YFzasI+ + ###D/lPgLtudvf85enueQdIZo+AddvcwQb/bOHn9xY8b9n8wtZvFITOaJqIcaJaRViiMQ + ###hvOTJRWDFSlsFWrcVT1A2Im2B3MvokiAaNt6AbTcGcffIqJF/WD1OzGtxYYKpGgKEK + ###XWPYsvGg0olluJo0XV5SfWYfc+yez+oXZEMkmgXhcCP3fKF6fXZzsZxTNJy6RjhoQE + ###UjvaZdrDfXbRPoxW4TppdEWrOn+HxR1dGV1UJHV1Vrl6pVAiVeCpOTxIx1LkxLyVuQ + ###dYXYyPIUtYx/jUYRUMjsi1NAfbBWifQUE3thnR9QHDlYyXgy8pocWehyMIw5R923dz + ###Jh8k6sRZ84sNXycGFUq9UPc4DF1ItmJbzv7B4gyid1aneP+9Rv8SwzIjX6zVZeRBf4 + ###lnQGavJLaQzUGVEYpEPcn36rVvUpi8pFjSHOBGQAXBnX/uq6XY3pFTVdYGGTyphF/X + ###vK+SvKBfeUC1aUC+8pF1aP8UWuowzQwGlHVTO9qtMvcp3mOjCwRnUd1QN4kRsA18Fx + ###iSor0TqNcISC9GSq2HlmVENk9g9+BDRbQegLhK75eAWhqe1RJXuswX3qkepOTQ+E2D + ###b1nc3/aDv+5/5V7f+8/2Wz/yXbqN//8aLQi3D/x/P8wIti3P/xgzD6uv/zR/zl93/6 + ###pV2awjZO/wEbRD/Nca9kgguwsCdkfd2p+bpT83Wn5utOzdedGmOnBjdqfsDDGTCIZw + ###fPcZtmOOmPboDYPILFOhhebV4/0rFkszRYe9fT2YISswIf5oU3wM1zz0CNr/NvpiAB + ###3Mxm0/ky/548lvOvKFQ4vMndUJ/ezrrzKZOHqrvIR+kkfzm9caCsn3talM4KmbXNln + ###N6hz8sdYuncXM5tGMXbi9XTmlZNbcuBslUnlG3GBAM6zMCF1L8VXrHlekE8x1kyUwn + ###bN/IxOZ+69bDSPvZm0XrFvceUIpWtdF4Njb44Z7a6KaCXG2eWdtHAyrfvnqDcPDk5n + ###nlqCtgyic9Ge4g4Gz7XwJWtv1lYPVxNfbWIe/lcJ7HYgofYp6+q7qvHVPFOf8ZdPnk + ###9I3/dvtXN2y5TivM7lw3DsbpdbEovuMoq9mtDFlnPOPOX4wCPeWF8ng9q5uPXk92tv + ###38XaX59aMXjszim2Eu4MSrN27w1jLOCv9lO2SoZifZvfW/7CCe0S01BJdtdTzh+OS4 + ###o2rnk5iMm9RjjOKZAxQXJgTGXDh6ddz0cvg+p4tl0w1qeRedM6EDoLqa6hq82eCW1v + ###8iuKBC1IstM6/cE7QpOIAcP+qr1vtAMBFHMjMwR0jnShers7HBUdxHpUyT4ijilfNS + ###iwqgqCcskfWamzaZd3MujBBEFMIbYzWTWybGcCHBDw9OUVBLPK0LdT+WivM7FMZVEA + ###dojKNYRhQEhy6fRUmQIkiIJ2hDurLhbIbN/+tZW1ZWs1mV1cUTH++6eGk7HsoaLm2K + ###4F6+F1QqXFcVy3dTXmBETf61swOkg9ozcFaV2shI4+N1vijjp1RtMlykFIKS7qGncV + ###sYR77xFCgF7j88bel76Vl47vFN9epQwS0Zbbs5Z9xGU04dIO4/3pZ+FHnUCv5E7vfD + ###OUZXWhHrQQEh566c57yvNobrRK7oQwrAj5bVNx2S6woBwUfKU+PbfX9pu3TX5+/qu9 + ###3PH1aQGf0sejabA0GEgo/+fWA9ahF505XrtP+aPNIv8ZaThsQ8QRr3kS1O5xiJn5Sc + ###GZ314IAiWp/iKCB4d/NiSEdAOL2lrlbkokhbqBmOB4GHW+i6yN9+m21crd/99tu2K1 + ###cX3koJXZ/Wsah5OitmsrQs0okqQafajQOkw7vWqnOmCiPxRGsmnPmedXp31yqyo7y8 + ###Vn3ZgsT0yE4iG3UuSzzuyao7G94pujqkpQq94WuMsnrxeJfsTlJfG+/suLm1JXEAr3 + ###KRBND6SbXNkRgynV42WxIMhrotPPVSBV8UZljaMcuYzxVIA3eIUy3r3YYr/EAfjRrC + ###6sYzXZn8od2oqgkKzdlQDu0f89dTgXjm7G8W0ULAcSYPZOz/6VZ292PubvMvTx8NkU + ###qRxWO60vjxUznkb/RaSxgIcvPoWi4Wxc+FxFItv+F1XwD+9WNn4+e3GPJta2uYETI9 + ###Dxh4Qla0MTlbEslERYjIgxXmTEM8C+NWlhaPK8RCmTi1sPieA2sdPlYtp4oIBHf52A + ###RQI+Ja/mVWGd+ecJvFKRi2BJCmsqVT+VDIYTrIL0dYn4ubcfHV7V2xojt+U4OSxdgD + ###NDDAr3S+9Bp/2XFaoJZqqDYlTHQPhe+e3EVCXRS6nCt9vOPWl8ad1cvhGE8WgUT+SF + ###Y3hye4o1NIlZELhpwG4DHfElhbJmF0I6kxh/QcWsqlY006OJ9klGPEwOHUkWG6f4JX + ###CQBcL4cixuMaxtgnO2asYOoRvNzWcmCRY+scucOor+jNKyNckz4KeFcIM5d7zi8kGd + + + +Valin, et al. Expires February 17, 2012 [Page 154] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###LtHZ6qvONM+CLDKHj3Fz3u/SlddpraixTNEGgins2nP+OJLbwxli2qs7t5D+OTZirF + ###X6wdCyZa3f6nxmag4Lw/q6ETCNSNbSs3WKtqHJaKjPiKAnlOp9YCGOmoxQL1PJ2Nev + ###0UBVhiwD0eJqKaQ5tIq+4aIhkI+rAFsGjmbhaC1l7M0/cgUqOJdzCcDJfDlMnpce94 + ###wWGtMLArnxKfcsQDhm42Pj4+ruIeXG5aUUA+IJNCPH1AN2nkjm4xKRwy/4Y6uWN1Xp + ###wdHJ4c00U/2GuoDncQNZ+18ifr+fYGI1jcALccDVT7GXAzY6MG+pkHXQuzkZu71bUb + ###x4oBt9ShtMXNYDDsD9GRqdfv3wBr5fH+ORsvIEyOl+fdfP9iu0IWIB9CxYiakOHXyv + ###kWNELlCdY9aU5jNK+JcyUz1PXlFG8a4DDP63yrTC5g011V9COEWws61czfUGXkR97Q + ###HIym03kD8q1LsKTc7Fl6TVMh87AirmHtjYBCFGZo3RUiLt3mst3etWg+S9mokfVty7 + ###wIyaAMdqH98ppUM5yj+FkNO3hn7KNdhffFBSJbGNYvN8P+O5JnHmUk+JwDi7LLGYUq + ###uIbFgsoHXtxD6x2KU+BeWO+XU6iukW5ebSKVWkAnMZSG0lvTLG7qYDiHkhdQlEgEd2 + ###Szmjp09ztPXz6vGd/W9vGG38IbSDDQFF2QUTeybI5xNRuA3rGgnlWkkwM3FkSASlTA + ###q1Pwo3lPljvz+pYhPmUnT80WsjdCCTjSxkIbNQxdzihd0p0xEA/oL93sSjZDXKGUCR + ###ER+8fO6evu4e7p844bFbOiewJmvUwnzMZWU3OMtERONRrkK/NyPhzQhqG7/MXOhrMx + ###pLuMc+tTRmPyYMLYVF+iN+5dARVHk/wyBfHzKgX+0btEnZNj9lLohA+pxMyl87qjUb + ###YI0T8JsFq5V/KlU9NZRn9oZtknBKfVzVE/+ZnnsQYcT5EgnIpUmHU/RRqIO5hATxdK + ###9JmkHxgPGotmjvydEo0pWnq5S1i/NqoRgWu25uJ3mW/0Jwy3op2kkIkSTRJ3RoYRX0 + ###VFjENiNCzL1PhUQcQgi8Vwj7ua2cJE9afz9Huagh68Qm9xGNFjsryh6mo1KBKMdQXz + ###CWwhlY3qHI9EEACR4jPY77M7x7TIiIkgTIlV4bIKgHnugTMD/0p3OQKNu0x7LPNY/e + ###sUiAquPVg2j3E97GzrZfRYLRKmk2y66N3l+i3xxRmSsl2PeGlhiMpFMWQ2RgR5cf69 + ###ddR7h5x7TrOAw9Qb1b2RNZ6iz2CZRwKdy9TvrGs4RqB6WRLZA9QYVt9UZFCAPP6qNC + ###Ykp7dVabRgzdCJWfDTlaImHblXoU/uXxe32bIsrAHpwdtsAXwx7C9hvm7LHAlfxkjh + ###him66Xd4B1VPiMsAo6gDYk3JHYHjAlh3j4dGFJTH2QE0s6NeTTeRa9+xmyXpPFmPdR + ###eR8XjrC4MZqRRtHxZ54MUNe4ngnXXUW1phFz1YClzvz9oepJHmVUFCayhVKx+iksR/ + ###STEtvFYmtNmZIFTCFnjH4TNUkHpRTUGvhPfNzGBmxAmssgDecYwWmME7M+pxhd5qlx + ###VX4yrTou1mhfGKOylWlUKIB6vGzkIefWRAFfXKMK5KFFTTqzZvClWZ8Yop9o0hWGc4 + ###qAFzSRMMb0SUwhhpqDDoS2hz9h4Vbv9zLT6Xad9av0xXWnzKe4BscL3PsFJpD3qgtU + ###WN6XPtLSvLly0u1iqrClvKy4h9mYrV/1RZFSzTIqtX4GleBCUyTyZYZYkt2fnECHvf + ###Gjn9nEXy918cZN6vCGVeiZdf2FbfQXmMTQMVVnurwq5vXvS7wmfjuCTOd8wJ7bS4qH + ###xpknpLvhNCwR+0X9Cp2S3o/N69goePTgGifheBB2vuIhTHTExLoYmOwNxpPuFNKnYN + ###oFjwfDlRAUOMp9fKqyGLF3xcokr0K/M8MKaewssv1E6niS6U0uEkTOvwNdoduS/bRK + ###VCpPuKvbxjcyfP3ALQAxkrjwn+G2uhhU8n4e4Nnv/lp9f8lDM0Weoa0QcWkPFkuEoD + ###hm7kwj+p4WbZ+A7VRW6blalUznL7ewf/yoiRKcN7nX/1xQeAH1yngZJ4uxJlk3qMJL + ###rGaxUpApnM2Yz8KEInB+/xbKgMwsprI6/aaAuhFBrgkYUWs65lb+LN5O5auSA+i5us + ###qjPsZpvhYIOOQqyrytapDq5C16AlIlmHaoF8/Bc6DVDl//9uuFh0B4PllzoFUO//H8 + ###SOG7L/vxfEbgz53CDy3a/+/3/E3+P1knc/xXMKWqCQz99ZT6fzq3SObkGA6IdTvqjQ + ###9LtfVPj5r1WcGQix1ri14tBAKXvSYsJSkb0lJxOg2O5oxAfb0NBO9xZfkqf5P8vxgv + ###zZAmv9dx4uUA79ijh/3gGD6p588gGDL9EZ45AB/n2pgwZf4JyB9YjOGDxCJPvcQwbF + ###EwZQ12edMag8YIAdKxwxqD5hkI315KfjzqkcBjDPGKxZn3fKIH/EYM36vEMGhRMGUM + ###1nnDGoPGCA8P7UIwbV5wvWrE88YbDyeAFN2wMPGNx7ugAqqzlfgH6kxbuqlHVrdMdb + ###ywUa/93C+svB2Zn97Nk5mXeve0De05Tc1K7T3vshlGOqyJFRLtIl3jezuBkurROQJC + ###wz+NTZXw5eGGcaUMqvOOqA677quAMavWhrpXTuoavkk+7VzXLxuYcbKk9PgCzQf9el + ###jXQ65SDGcWxHxZ7AAOZAnhcUmJouX82fRad7Ey+Z+EloC+YRyApUgBhxlULD/Si9RT + ###v7RTpf4CEhyDdaTPHqeAwRQg28G3T5Ziq0Vg1uJn2iq3x8xPT6g3wXg9Gd18iZpvWf + ###hlp/dmvh7XY3y6qbVC11A8ti+Le0u7QG4u5el1VXjd1JrfXFqppRjRzXpB3XlRtXpo + ###mqWjE6TwwyuofLD8PLy1EqWZYfsgtYhi2221fU0r1I0RrwTN0WX6vdYy7JTOU2rOH6 + ###WIfhpU5JMiTp99ATvH1lae9ID7UqB43JXUljM8i3oQLmemyGs8dG7B3yqv/htCFPtJ + ###PHv4e5lKG5x6e6mi/umeW9fAVeuYa9LuhnVmMJctw6D7xlrcNIzTw48I1thWK5wsAD + ###GllB/gU/lla+DdDwz08aOrmQvrGR4YH5pqC1Fg6EvBt+XUefsY4qMPFfe2kRBu/9a6 + + + +Valin, et al. 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Expires February 17, 2012 [Page 157] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###9StpMo+Ihidh4VW9nFgcBK4SWsKnbfviFnY6sra4sQKlt525jxSfZKcm2r7EaSWoq8 + ###WWa8/ABi2PRD7vUE3+OM5d6WSgN2brsvCSD5ObgfTwzYZpXZrt3IitbMs1kFaRjcLY + ###O4CO6CKAVN8ISWiEHWG8BZ0Z3pXlEYZ7pklGHpOBPWSArUqDVDAQCIlhLqRNMiAyBg + ###V2+wTOfSkyFlLPWh2UKz6d30hmuWW1N504eUEWB9y8wDV0uqpG/MZeHOUx5hmbJktA + ###hguMFu2BrVuDMgRa7Cxe5gSfimXyxMuN8ujal73OXLwhfbDZW7aSyax1khArjiMoMl + ###TuzRwfFBY7Hhtrrk/lbZR0DHycp+4oCZ1Oa7Wt3XnR0qQBke2F/V4Ya7tcWt5fqt3z + ###4pLnW+QHc1gEfmw3UZ9CYNWDCAD45eojd61kMEmw2lCwvL3l4U1io0t+P8uar8NZQf + ###Nb83liKVXblkiJOfsx3goncxHIHAjZQe8JdEfOvRdJI+wgXlPiaYjaZXsyZiqcgiWC + ###1AjN6vhA4VKkKBTo2aLy6LL6jr2I76g8kjpDNwAJ8vtzNgMWjngBrYqKDo9uUW1zVo + ###fAOPTYNoXdpF4EKGPy++n98DOI1J1Ce5/lGxhf7loAAL9ispMgfMmEOVi8+FkvliuQ + ###Jsi3vANt9eANigEwpqzPUwghnpgNviKK0xd96iEbzZ2IDcfCTxoxakAORFBlGG9fJT + ###oWyOU61MeCpAO8dwi7SP6VuevmhoyehBmJxYLJCCfEG2PORFQCoODk+eI7Fnm+TNxL + ###hexrAYOEzHDQecBvRjh71LcJXb+AMa21ZVdsVhGFAUXiPHfHlwfM6yCcO/NMVUgb1t + ###ZlWvc8QQGt5B1Npw1fxlDIPhpZ2V88SOE+E/oIw6C9Rt9KS52NqCun/LKMFC13khJW + ###BIy61tHKBM5jInGjPfl75l/ERhU3YOopv5zJeHkA24+4DRVOVW/tJa0qvANRrfvcwL + ###MrAsBrXyj+KK1CbA4tqVpSqiXEm4wzRdViVrIU/wR2fYMvipXsaq8t+2G7qfzWqlkl + ###fh1laut7nuVyg87OjCNCDrCeb76eB4/+Sn7tnBf3ZsU/RWM40kJ4db3LlvG7mXGeN2 + ###M0jt7GxrCOhG7exdWUrO4FkSlXPDrVLydLV54vTQ/f9K/48+7sEMJ5vXX8bH4B7/Dy + ###eKoqL/B2b/6v/xB/xV+X/QBaDJp/h/fHX9+Or68dX146vrx1fXj1rXj8frZ2jm7U/H + ###4+xySBTWZ1M0V6MtZzbqLXHR24sZsGGgd0rgp/WIkrzh+oG8e3k3S/O3WG7h1ZY5J5 + ###GtEdSAV2Xiu4H1jegJja7i9N0fmmv/JrdTWsZbq+E2dbd1j1QfcSP2jq1LSiu5tLjo + ###AjuOZGWENaLWMb4YEfOgjTQhtUA4gA/oKy3FLoa7iri3uewRSNA4P0aCk5qb62gY+0 + ###ldqGmCkgyzuL+MVM5Kewu07fen89l03lPb4dzuZDqxd4/PDrBXg7S3xA1auTT1GOaD + ###ecmHFE8A4JkEoXlWj1ujxnoXC9S/LtJ+jzga6WGaOPYW7PkCctWciLkMVDnIfCDIAL + ###UlGyFuSHFIDwDhFPf2MlDiMxqAsDai4VITwGo0snBTHG8nVSR+ku33Z9uyi3FvvkTT + ###+YfenQIUVYdOK0s9pwRXJOpjdPGZWFf9vtUINm+bwliG7OfxPY71Brf2++Ppe/KYwb + ###PqzL0Gqm70QRou0z6CVp3pWKh9D4DJpH9NtnIQYW0+rkguOgPMcjlNFwT3hlQG6Aej + ###ARlAdiLx8tkPaSreLugsMQPI9/owt+zKgmfqe4ubOUrP5IBzgJZbAAE0MrprKdOn0T + ###IIBtfTS/TFEfcOBh9F7Wi8PLOilhP7LTfkQxQXd9bZzcQ6GiLu8ZZhCx0vZuzuMkT8 + ###mNMuNG2j9PrvaB4x4A5uorjtdkR+/mpDML3YJIC9Tzen8yt8fox5XHTGjQM3cGnP8D + ###aJKHmwnD1GQ3EfIPh4Bn2FJfj4BRDukxfnm+evkOmd8PT5m7faUaRFmziEdewcIpDC + ###OW0RwiJGF/ARe71GpmMRJoBO/QwVGI5e11MUEEepRd4l6QwW7QwvxUVd1MSChdVIN6 + ###82eecXUBdNUTcogOQzKQPGjLbxYXXBuoNXGO+kyS5GhNKg6yK1gAHQfKDtejSE6b5D + ###Z4/LYR86Lwv6qIDNRGTQFI6n6GmXqofeOSZxGg9ZVB33blnMYUwnd4YryDyh7fcZ+/ + ###KgOd0cgrhaIYatQnPVlpJK0d0KZwBdF9hjRQjPPP3lZjhP2ecDaTCAX1at2SRieKc3 + ###Hw0BmjhOPZaGTwPmwcK6m+JYULpdThmMvXGeRJurOSNusuWG5AO+70ggJY8aqLPR6F + ###40dxrdXrOpryoe3RG3UiRaWba7vRbkZdW9gSU2qLCNP7+16fcWVdQkzrMH+gStGNrT + ###/1sKS037njEdXoCCMLpkRzTl8YL4o2kgeYz1u8PR9IqMZQOh08IFyXcKqSjJuAQYqR + ###JHra1syiuQWfDA0jz06GyvC6IMMlDNb5X+vLNGxrvufufpy+dEUjUVxZnN0fiLOxVX + ###iOE2m/euxr0sQ6P7dLg8A7w95VNwTb0T3+0KnxWz78Virm1K5BdodW/zZkd6KeadQr + ###WNb+F9CwoYNgU8Y98Uw4I5oXuH/+nQPLrN4vsG1GA1bOkNPFAQIQNunWMUdbvnB939 + ###MxDFn5rwe3S5ANpxwfeAVzTnr2qvO0KzbVVz3e7z45d7XdAcTjt/pbYGVu5dw29hoC + ###M6KIcWzKPdVzvbnhvEQeJHQUwXlVd0hUAjQRe0HW8dlIhTtCc1y8Wko92Lm+EIULPb + ###H/1N+ovmRWj88OT4ebH1w09pnmb3U/swyjrB166Xrl83po4qaebkpFxlCr+VPZoodv + ###d2e9sBwtZXTkVCfoBWlfXOBosyPb3T//Ts1KRLnKaXOAkV8BaYo3a1Hfd+Rs8o7SgI + ###AmqKIhdSfvYMBe5CBZGqkNyD3VTeBMsp2dXFxU3RXTyed1mka2wzR5DK1NgZmFXsLF + ###maRIRyOwIY76G6MpVdajGn48vZf6rsf0xWukiuFt3BaNpb/j5LYL39L44dL0T7n+d5 + ###oRsE3p8cN0KT4Ff73x/w95jjbZkOU8ShBigYoSDcu1lO0S+uT5rYVTpJ5yru4CXIgI + + + +Valin, et al. 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Expires February 17, 2012 [Page 172] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###9M7J+J/TOxfyb2m+ZbcdmrXXq98+4ggJEcHr0KXpeNq3k/wprtxNekEoibX+pTHzbs + ###8WDQH45sjUFeyszXK247w9418DWhWeygnEpXJkgUxdvhzQh/kvbRUgxjGHWiISYTpE + ###gnOq4P5xBt5I7AEv63FY+iv5+Ew/XnlZPT9883vhIb+K+jUySqgwOciqb4Tox4DJx9 + ###uPUjvBlh0qZXi6fwfzyO5ygedaOtHy80eMCuXuBVBHUZiUAhGy9ysmHUxm2n17rnF4 + ###VC4EfXMfnpkJB+C2J4eC2ihGLCUNHDO2Biffa/z9h+OAqBDbf6FO8AtrmeGDOvch+F + ###w636cwl6uz2EBrd+bMLWdBPeDkb9Hi932++Nbrb+e4yOShiG6L+IVRwf/J0wYo17B1 + ###l0GA/ZSb/TgU0LsX0RtmFYbXYKiga9OIIhv15k78m0ZuFmh7AQYfihPUIPQP85TmIV + ###IvVX2MZ6YXfrx7/v7J18ZZREJ2yJXa7Hjnq4tfApbN4no+g2sYYqoMVrq7fRVn2Nfv + ###FIM1vL9GMACAUcNFbXqtXG8xUHAfTr7cXx1o83o9HgxdLSly9fFmHA2G17EaZrCbae + ###JFmKouXnG0t4yxdwmSwNQtjUkyWOk+cbfJR8gIuDdgfv5H/FlaQiL5Gm8gWKRQFePF + ###XqX4DbYEX5rQSkD5XxImDcKdHH6jbGtFkQf8NKC/D39pZ4kYz6QxhhWWhJVYp4Jb5d + ###jTsfzDYWPm6V7HyygYo4LOrX7IBRDthBOKJIv98belGsurBQcloqFx3S0vzZeDQYY+ + ###AhltzfXvW7FRXuKwSpEYMSIWs5Ir0UpC/yNBv0gaDxxiHdlQaNOLwWV+uoDoYLZ0kE + ###/0WvPGo1oat59yjA0SKmy0cA2xia6bJ4JG/6AD9CsRDB/nITkdwCnAIviCH7aJFrHu + ###8E/QSxqX6rNR5qEBnlEYJqyGHIK0p2JQAh6DogQyUVfbuMhy8GAFr924gkTWBIqDiH + ###V90IGyd/xev4M8XPghr9YUROXSCqgRBL9gTWib4AurpdXJSyM7rpx68Cw5JrfYqgLB + ###nclxsYsgzK0eLlXWBoLLoDOYKOyDuyz0bDcY/uLRIvJ5YKbcIqpEjNOMqWQjwlmcfG + ###hdNkAj3fxngVlqNsNAQIRHgvkvq4FaPCelGEl9yS7j1LhHQJsOFhI8YiEGQvLTZA4g + ###G1h3fOHJqnA8WWIvXWD1sHe0HzrycYoa7M7/EuzZ8C2OMhzS2HS1IQXUrsJ0l8hSmk + ###Ot1xciOvqYlQcxQQC+uIy7f451bQ2t4W3WBwxJeim/1+76cRJmzB224hw4XK+uIyYT + ###wEAZsW8KI4LaQJxqtnqGLoa2+j8FOE6duGFC/tCtYDzEHrpjoAioql1yqQV9gZGVCq + ###VQ5b3PZWrSxXJ4aW/n3LZnkccbr8Ag1KxEPXLUV3mFlGRvVTaxvoTCXGu781sM2bea + ###ZfyGLtPpsMDrSlIrJTZrdStWpAUt6uic88GruGHibD6RNLUBYzXR1D4Gl2atKVcBz8 + ###m7MT0LiX5sUKF6sg0ZHKK3KaE1i+Io4a+ULSFXCgZT4zfCQS2N71JuKLp/89uxS4TR + ###E4RwjezizLqsBKieKoKk/eVpZUd4KaHUWZg4FWR/3qDWh4Vb5eOVNAIu5TEeMTkD0p + ###epKEdE9b+s/NTYPMn0kALs/OqyKgozG0za3UkhBfe4ifgMK2LbiFvuK8mBMS92J3jT + ###vBDfHWaYWMUWMe/o2nzvm7tWNtYSljE5P7FE8faLzkmTut1z18jzDzt0vzpu84D2zH + ###xUbuEytzxJW5J3kyvkK2NwLuO6QdC1viWE7jQ9MD4GPB3HVTwAKOt4wZML/AKrB2bJ + ###xEa5x3I+u32Ma3VMYqc31u8X3amBPTTO5KGp2u+ePG/DGiKTEnimJCDLf0gJYCHhkB + ###uU6nq9iNHsaCUbh6dPL2eLlRGlag8KgKFeQiMDBklrnRZVyegM1tue3d8LIpzsA5gg + ###crQCS9B2CGIodOxM32NhV8CHpK9c1N3suTYslqtgCycOFEuNeahw03IWlgISinvehH + ###XFX1JWq4278elBeNgxpsF3qjD75dH8ZvIJWqe5FqvkjcF10X7fjbZIH4O9kawmxgD1 + ###S6uqVmBQqUjUXXXRg6KxZL/CV5MZyCsIK41e74BpxUvMFeqby18K4KUReUk8NICtMW + ###dfYhSKr1jzlkZZSqyr8/FiAxu2xRfOEYHXxZ2wOsRPs350wKY4wzIeM3zTrinD8CUy + ###APGIIwv5zzt4gBUz46PntVKlcYvyyDkjwZbZRKwE/XanwX4KGMkiQajpDxbNdpsMiC + ###KNQydLYlm0RQxRzBa5QA3h6dXtJmIeYLXle3zPcvxestansbiWFBbNadrtbRysRR6P + ###NLQwxBVs8xCEjrdBfqFQEBM1ZkIkXITvdZqWSgtgzrGFusYrUre77d9nFWAuoB4Fyo + ###p2eVOsqfVQ9LRdmSdnTG/7EnEi9O4Rux6afEACIDKCO/KElATAJ+W6AXOBfvj073z9 + ###4HzaP/ORCz0e5LeTlH4pXKu5Dz1IxwEAxhVgvE9GV7Oy1hcXCr6Q9cTObyJxax6qqZ + ###4Q3/vlVSaCsDXjc3JZ5ovFsKA2mxSaMtJTvJNnxCoGjRmfFBiN6gMQ8t5Jt/y8Bh/O + ###qp6VdTrYIuqVJ4oemlu/yo5mYKN1TbfFvlJfEbtrNFOxbvtgp/qt5sc4viqnwn5Eog + ###qYUYuuoqijC8W494W9uRw9HoUkvZVErW12f/P4Tl94AEdQLBXnIprTADGHVnMvwSxn + ###TZK6UlO9CR3qX+TMORBYapAYEMu73NoTbhUne5/sbV826/PyB09dC8w5E2HOerLc/+ + ###fzZbQvBIlTH0p9/5+rHKBVLl0eUWrPFwEKWvC0CFCj/A1RPvJC2ioIP5Odl9JDRBSy + ###ElMbtaTy2A5GYY9z7lMT2l6VhUnG3g2+QyPtEFT3x39u7AoKIF+lx1apEx1ixkW//c + ###0q4pMFvTcMaLAa08erfm4czLxTUfN3Fzy5e3+QpTzjs1u3wjfx9JBd6M4uRERufBgn + ###qYpSDRJ8XS0CZmnJPR6GbMo8/JeETCP4ZhwrKoNaJ7xdfhkIxe0udGd8LPWDml2Dph + ###VYkCagkRfmG0W5Y+vr1NQ4MhGwthAYrB6uSYgXVYgs+/w8/ytlnIaJqvxK5IGYC9wK + + + +Valin, et al. Expires February 17, 2012 [Page 173] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###4jxIecpr8qW4fWUnLtGtBWhkEDe4H/TbQ8dFObHl+gRx32BfnrZzRSKlMs8Tlu34tH + ###2h4iaMA0+blM8/ffLXtYxqi4dcrqXfUNFYch42HoOQjQ9S3GKfwSdbvCUPQQgSRrd7 + ###ck+aeQQLLlD6/0wSdirxthNMbePSAA3dpYMgiF70bYbtMHwHAISw82HI0jJqamG4rt + ###SU3LD+aIxCDNZJ5phkXcSabw9DMxLOIyNG0KJdxqI6g0CA6jnzDcgLAL8s2A2H1IuQ + ###0qZLdn44HcpCyzatbRS2pz4DVx45D9I3Oodl+qX4LefiJqwywUFYwRCFsSIhhtlbcc + ###/Zm4fQmrQbWGE01WaJFk0TB96iFWxDFvOAIU3PbxfOYWz5fD3kiPdtpjp2fPuiRylv + ###9uACOIkUStblkjxKXtLfOTzNUp/80+wnJAAk31d1fa0kuQN/j1T5+i8Zs+3vvf3daT + ###BgCbdP97rdFw8z+u1eoz/7/v8fj8/56j/19tdsdn5uw3c/ZjM2e/mbPf4+9qnx/vGR + ###e1+S9vPgWZ2fF8Lzi7gCXCGitCvebx4LuDlnWLGV/IiMHyPSbPCsX9jIG6lt2Jh57b + ###2HfGPev0V9Cdje/mF/N+Nr8ibf/uD9sZNUUAYoIpTsGEsOfD1I56npax3tPAxPGMEZ + ###dQZPaiLIXpdCEuZvI5QFehrkyT1g2v+R/GJXEMM0Q08f3jDJnyH6ZvxLAsT93HpPiv + ###62trXP5bX1upr2L+r8Z6fXb/47s8/+F5gN2enB/BrnRGvLvJfIXgwSwcb3uY/ARjbp + ###MUgmdjnfgualcHfcpzOY677bn/MHIsbNWx2tGIG6iH/d41mdF4KyKu2Vg1isHxuWGN + ###snO827kIcPv+a/MFewsC5d7z5+xzCBLKVTeqiiQS4XAY3nNIYGpbn4xEkQhv8yCg5C + ###M7vAX+sVTOKg+6eA+BAGjF+Z/h79eBoldYhdwZoVx1dIPhzpKwE7Hrbv8KPXgRnLn/ + ###2Ds83nnVZAtbrLqvYbDf69Ehii5xzHQgSbJcpxOh+wkPyI55EaEIuY8fXwBWDzU+eE + ###aXJG6RZSAZROgfOeCZRtCTiGeD7InIhdCKjLnxgnFfN5TUcXQ/yQ8/yWNRLiGWEFWD + ###YVTF3tDXDVjGEJO9mGMxQJsz38s2t2CI3ocdnNLumk97c1ajZ+dvmwEIF02osfXTj7 + ###XF54trP/40J7fXJO5+EjwuWbz9pN7z2Cfp9wZPpPdz6ZQ0zaPjn4Pm2dsLkIsQhv8s + ###mW8CKlqeo5wyk4oen+1cQlEefx2kOpH+ZWvu+GgXxF76G6T7K/wtv7HFcO5s97/1zz + ###4gZI+2Nezg8uzsGKTao9OAN1C+brXMt7xeeW7vl1+yqyws+KqACJxZJRzOgWQNYPo/ + ###D8MeDmPvPLuF1mBurjUYdGCTTKrojVXliy4RFcJ2GwgPGAxMeuU/S/Vy2SkupjBJFT + ###8Sxbtto3QXc12142G6+LEqDiVkafiLOY9TrSuqzYHQeIp3HaBA9T1wCfgv/D8n/Sro + ###UqM+pm5J4B035FXftzBHFCVQgh89Sj9b5am0sFRyE+LRCXzpV9G3tEccMeEveOzQKl + ###0GRsdn/haNXlXhiipXCy2XswarXgPcEsayXEG7b4+O9z3Ebi41i5PDb9CBUIHhZBzs + ###nB9JSjZ6/M8Sxq1k3okFhO3tH2D28SbgbVIlOb1Yi4v7VO14X0EoqvmnGaod7wN9gm + ###7Fq+GSYlY1e7qxAhTBGRV74mJrsXXbpkRffPb39gB/LfyDYIAfffaf/8X+c1PXGAxU + ###Harxyy9ZVY6PTn9e7KdJDDtB2HGZ8Cr4i/8pKhlgiUr8PRT9PybGLbv6z5LiMzCyHd + ###CAj94dWA1g/Z2LMv1X9vhf2NKzZ/COr3J8NTf3//6zpDhR+cX/W2zN/TvA6yKr7Ck4 + ###GFhFNZbKuP3tUxYzdJUH3Mu5xqlCbr7E/lcJ8vSbdrf0W5RE8O2/S9Mm/p0MW6iZsX + ###fnO5eveSYq/ie0PWy9WFxcuoE9HLa0Ofl6MdUyZRnq4NGH8wFaQO7vfX187nvdjK/P + ###h/3MWuqzVXsEDILGIIQfLpwIoxfMTXC6c3IAkONWNne5c/Hq4FLQhNhTyvQ3FeN/Kn + ###JoXuw1gz3mblRIC3QwY/wmriF/z9GOxF5gxUE4SsZXoBLBNFesiYcVxTvANXV50Lzk + ###bcg+cW5wbAECDrSkShRs22kRO6E1vsVu5+bU2qcpRfRdjLtAXyKx2wuU/Obm4D8vcG + ###8ipJVx52UKork5+Gl8nZtTf+JbBKWMRO0sKSinmjDXHrVkjrBsNP3vcgXrVv59rtWN + ###wt6LuX8f3rJqh3kbNWAXEKV6MXRMU/9z5KEn0zEm6H+1lTW8/7+6urYMat9yje7/r6 + ###7O9L/v8ZhLmsuZxCcpL/1iCziOfIP/sV98GdolQChBE7r7jt8jtV5RdAnjlUo4br6U + ###UejMd5iJtD+wu71tt+yKPOSh+YaHmbXedG0IKJh1kB71MBzZEHz+DbjSHz1pT/iY65 + ###/2nG/QB67xdVjQWesfHp7/Z215eW0Nz/8a9fX1f2Or3wCW1PMvvv5T80/K8tWX6G4A + ###iyEaPkUUmEn2v+XVVT7/jZX12so6zP/qamOW/+m7PEvzT/PMpU6R1yiKTIU1P4Gmy4 + ###7xgmvUXmQ7oGZROUwVkkTDz/By7gnOi+3D4hKIiJgZWjnHYPehOmsV55fyLPQq6va/ + ###lOcecsKsj5cfe7Qsj3PnHnau/BRnyk9xoPwkp8lVdhrFVIfuQIa3ZAW2KKmCmTnUZ4 + ###7sQdRCGpgDkHljfdD5odt7dN6kJKQUr64NrykNLIBxiwkkOU5GaOIdUtYLNADweUj6 + ###ndEXnGNBZ6oTqBQj+QlvCKKbJCHo8Rw4fWJ9fLR3cNoEKevyjE4e8VD5rz814V9Mi8 + ###7oXLxJ58qv8Hz6YH+OTs2PmrLm4gMP2OesM+effnrw6fqc5wx5uqP1OeNovdi5uvdY + ###fU6P8+z96cGFOAGf6mB9znew/pBT9TkXIw85Up+zjtQffJ4+Z52nP/wwfU6P8REn6X + ###PiJP2Rx+hP8yypzKdW0B3jED4Vcsf4RlKRYakR0XPY3k08HLASKg5f4jbwMi43ldnx + ###OeCHdWKMxKAyyjqyVWlOnUPzlODGMx8OK/Jv6Odo6YwZDfJwlKKdNitJ5tSNQgoDUy + + + +Valin, et al. Expires February 17, 2012 [Page 174] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###9TG9x10848LhttV3Rn2AH+e8xP0DAMxdC1dPse0YFserlhfmwhaoI3NCzZAUcXz5LO + ###Sjo9l9gRuV9qjZJ7yRGU5/5udQJ/xi/dbnlft3EP3vR7EfW6ZUBQZWurq8trL+fEnR + ###R2ukunXfywq/nzedA8eXv8fhdP5pMRIJG2G3h9QW7swQW68ZToDZTDS4HQKPyXBIdF + ###hQhoeDcOaefVbVJMEpwYfrIJ4iba6/hEps4TMjAMG3iJxTCk2kv4Z5O1YUR1+HNhgZ + ###WZ9q8Nhx/g80f8c0tcgiHCKmcPRSOpYlZXjxiqdsbVSF3YMgsW68I3UVYX3McXIaEx + ###AjQPHYmsr5r/l/bzzXr8+h9I5pQe4knUvwn63/LyeqPh6n/La7WZ/vc9npn+N9P/Zv + ###rfTP+b6X8z/W+m/zn6H8jzJyFwkjvkLkImQq4H/P6m306IpbzA9KoFn8MEb5ey0qfX + ###fyvnVNvg/9S5OiX0wsYK/SN0rJWVxTr+swHNpFvakH9wlzD29pD/Y/9y/kk1U1fq3M + ###5h8dbSzSi9dn+K1rCZQxT6ObbU+LH+0eHE1sQ/KWC0iiqKiOr5jaWaEejHGidHk/5R + ###raWbURO1z3sW/3iBEtDsiRkXTguCFl/w5vEDdlfdpltdrIT3WRXdEs3t888ghg3CJK + ###lehbgtNu6YygkHBbHc24xy44FZCgGe1JoQF3jeiZ2LhjRimK8Pjy4Y+dQM+l1x02ye + ###RpwPwuQ2cA6wjYuTnZXCHe+IjovDirWOehQ7kNKHJyIFdFvIWDDTQMYkLPIYHToFHw + ###klIGFSWnJejjKTn4lYhJPaE9gQUounpaWUIUupdwEIMZ/xiFuYs14NoxCdStCt9xbj + ###Osef46RPBiwRZtEwuly32iXXEBNW3DdXKQsOvBzdDsQldLrtzq7YNqtZpgwoAZp/CD + ###r8FeACdfz9o3fLjRL0AG8Me0TI0NhxpV9c0QvVAzcoiGi1oQhhBnNF8Wjiv0VLqIWI + ###a9ESLTwhC7mEh3TtG+Q7jNIMu0CMk7wk40RKMkQ3gQSxpKxUDp4pACJB4nygnuC/Q5 + ###A/8fN807DL6YebAF9glnoLRPPJtca5D/DW138LMOa2aP0F/iFI2BwWKxH7fVDzuNmZ + ###zZ950Ga276GU1n2rGx1jzkf6KzmPhrshJX0cDxpoEKvQUqI/tXmPhyngKBJwIwndRr + ###cw1yUGOIZ6GL2k3ynlzkgZSU22yrHTuol4+FtoGGO5g+y8AzLjwUXQfHt+DsJTsLN7 + ###BhLGysbPr/9HxhxQ+GabbKNWq7Hff9evtln9ecN6iYhzC+I7VRKXyn+Qe3mxDoAdFO + ###xAlOQdkBgk5xQxKILT4GLVK86KL40rriBeljDtkgjUjBcK7F0Dlc0BcjKD3evIuObg + ###nq9JiBWo1e3e+TDaV0x2mACBNF6aBbAz4H9R0Bn3eAjeLZcUBHekfKkrYnAq/JEJgc + ###ZZPgT1aSEg2rZ6ntRFbWIXp2+Pj9VM2ejkJJCBT5iLt4NMdI4HAc5WAWyOB1m45N1n + ###INPtvj5l98Av8hDpNl+b1LwXjb45WfB14O53sBYuUJjAPYbvLkuxZsZ8czHgGWJZcc + ###yB6/KYTOK4Pxpbpf1BobjC6stoFVf0C38vm+uZ1J5PEcMYSeJcBiGLEzbESAD8PpEB + ###j9jE1ZHH+5IFotkTMB091WWrGIYnMkEgNk9MmuKJ1titi4QrLNGEAoBxRK/ABY0+qK + ###+VjE2uXqspTi7a36M7UO5uRPbCPl4Mw1DcdM0pxZWuog7GSEGCqKaZEz5qwAIkfmJh + ###AuSlFHMSNJp8TdA0eshKH6NIHVaM9lRFwZIEJRLToaUTTaCEbX2OdYhSaoWNhvcC9Z + ###0hmdnkbmpgfzLa5eowDmvMBkQ59sOWSSmwLxk89v9RGSiBBZ2Fc9onefwahqGDffHV + ###g7ZHQ+iAAZDF0RxShUzN19mSr+xJiiLmeM3Bojxs/DTp3Dw/s8QYuy29ZZ7s/BLs7m + ###A2bwxEGRydVnT3RmOIVLfBLYezCCSp6hhC6Cq+rrBuhOF+fkWzsLzydxveUcy0K7X2 + ###FlkTg6GjebY/JM5HwdCArYLyuWiix0MWOeN5adfLEi1SvDqD+PgBoCMh+jD2VXJsTe + ###g8xLsQq5VBmtvkTeYALDAlf/Ady6BaizDlwmR2ECVzbRvga9JpcBpnec/SvDQnvRCG + ###EtiR4e+6OydQsIk2a0p5kUQvYC5F8Dqcda1OR0PPbOrts8i+3ghevwm+DMMBcJQJc0 + ###iyH7dgaOQ/rv+jo4sAdHObsriWULdfOtJbY8UVOAwoj/tfqr+NQ4p0HXa7VTRFZKNM + ###gI2oKCCJ5GJI9P8ao/s/MQD2jDmwuEtFCmmsZOkOWTSvNzSX6h1Cpy1sBar718Cydw + ###34qH4Z/l7x0M4h0sMwbKE0t/zS/brXjzqJRI1Sq4PlYCXYOzs4bKYqTEOKJHZbtGjI + ###uj48LGfiweEFWct+eQICGkUR0AAU/AEIaHAEmFTFvI8PAXX4uzEBAfWiCKgDCv4ABG + ###wUXQlZS2Dj6ZbAxh+4BB5OAZOWwBQU8IcsgZXHImASE3QQIO1mf/aVsfZYvKx9c7z8 + ###MfSyUs/kGRs1g2n48AIFXlALadRkjHKjFkD5gE5SnmC4KWntEaOtN4zheqmgMfVwoc + ###qfd7xrk8a7Nv141/684wUBPX+8WGDK8UKVP+14lyfR8/L09Lz8neh5pub9I6t5lirH + ###z7vQ4uk/78TT5whhfkE+hK6Jeoo5xeqWLR3qkwGvcQeVcHJ/Z+IoRNptlLU8fSJrmS + ###nj3ueLhxrLideusAWCoCoEg7Jl2iPN5aUEqrDZ3G8yN2GtZJvvBRxkTc8CGyG2DaVO + ###+zIbgEb4bXgdtwJhQcU9c3lldW1947nAuZPwVZyx8rSnRA54bYSbBpV3Br/kUFHOk3 + ###TWTslIbKu7sq5lnZ9j3IthwQN0Z2UVOTeXB88Fjo6r2wmaOBrWEbJ6q229biVgW3jW + ###7lSCt9lVDr1VDmWVYoesPuDPh5EXfHifDc3bAZ41VFLw8PcCJH1i7JKLmoEXIvqcSL + ###eIwfVSRzBhj3sMT3qyKeY7O1vYl7fcB0j/w0fzOteZ5Q5BHj6+seE/9u2t7H7int2F + ###5dDh7WEqh464h4Z0t/lT57hFsl/dg7Gy3kXDuHPP3ek5Qr/QXSnpidOmrYayAvVHPC + + + +Valin, et al. Expires February 17, 2012 [Page 175] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###eQSFoAnwzLu8uqfjB4lc3xntph4bEnvJhnKJab6pJzNqXoH4NJCicvFFhe/83cWFOz + ###1WtynB8B05d/A2G9TNXQpBP3MI/qB2yffaSkt8Zv45BUbFJ86t3hiCG5FOBKC1Eikn + ###tTthBHitGwi535Nu6J/ireA97yS2/9M3VKyq/cuefPRj/mIbBLI/qYFfdSE7HeWYft + ###d4tw5kA1ucmzzNNbo8mUKOuDwTcrBIPH9cPh/5wK8F8XQW5jqvN8Anf6T8t/5HglqE + ###33n411P9I9AIoeXScNe98i0Un1Pt3EeHvNFOcnIuBJB//VepMJVKEZeRKAvu9MfHUW + ###Sg/vpWq47cIogxqfLT7JayOrq/obMBUlU9KZQmcilUl76KbZ+0SyqQgYy5b0bgpb09 + ###3/89//bJE3BHmtBm2M2Nu/f8RN0Anxf1bWVuvO/c/1lcbK7P7n93hm9z9n9z9n9z9n + ###9z9n9z9n9z9n9z/z4/9gXku6KTWXuWsuyctFbD/i+RWbwnREnzJr2VYsIXdRA4YhS7 + ###wJDGvU/CCBjmz5W4YLkhDw4pSPI9Ok5rOBjigr8ige6uTI1FSFcn8OUMq9Bx5J2+Eg + ###1jYa03BI4KVv29gjsS7ZvBVsuh2FGP4bv1OI7uPmoX3rjnajThf49pj/HkbIxPEvAQ + ###h1Xt2mC3cBOfsG5NUd8Ctf6rxIlANd+TOg/nNwDfMsjgucsEEXVHEPiN4yENOY4G1A + ###38WozUHxeufHe556mPjHW48L9aUaha75VrFr/PI/n59AxM19bB8T5P/1+vKaI//jBZ + ###SZ/P89npn8P5P/Z/L/TP6fyf8z+X8m/6fivzxiQ5xn5yg+AQsMu/cJxpAQ5txHjIjf + ###Oc8LSup8JQkuwDQhIt8S6S86GKkp6GWEI+2G10e9dnTnPSqX+kbWN6lcmC2roCfIpm + ###F/zG4dT8qnaVm958PGDFDGoXiqZSrFPofdcZQKxJkVO/UwCT69/lsmLgQ2tAfMMPpt + ###DNrTvQxjk91y7yoAoaWT7fRALesLjlBYXsrUMHuipVLC0U+wDYJSQ3/fhnf8j9bVpw + ###DVspcegDbY/HF4HeztBoPR8KV1TxwDj2xt0YUFffSB39QI4Ov5Ad35O90NgP8dXqQO + ###CnXjoGU94wrULs0YKoXXUeMDq7GP9B/7iEYCzfBuLfQCPezt/twMmpfALRrBwS+Xk2 + ###4PGsezeRBvb7O6e9g0EeqgXgtukwfCXq+dNP3HTd8Q0csPAnYZO/0DEb38CEQv+xHN + ###aVysEsOdYHe3RCAfnQbHO6+Ck2ZFLgIBs1hPniowSn8VXlz2taB4rFhoFO73Ew/3+4 + ###ltKuzBLyfir8HooCQGy+UN3lLYMsRfycAl8QGb6ypMGROQbpS8DFHEKbkf03xFH03O + ###Au7++R+//ef0uHkYcKPfE0QAzrf/NBpr9VT835WV+sz+8z2emf1nZv+Z2X9m9p+Z/W + ###dm/5nZfwqe//4HN6YA/s4uDgKUlXDmAqC1ADB7hFm1tS5Sy7Yj0Wkxylrsc0QpUeQ5 + ###a85hsT4rXm4wV1grsUmPNKlc0OFiwi72uQEE2febxmqqvOWxnbLgGOUQCtApYP9ITO + ###uIyvwC0F31+5/YIASOL4b7gR2f7wVnF8CpQGfBZB3+/jy3HuYHNOw39VXbFiMPv99g + ###Qk+6VGDi1+zwozk+bvzQ6AR9SV8Toe4S8T7dnTW8Phc7sp6ilzrmB++DN+/TZibZHw + ###3qS0RyQ+bYsvrzwEWDux0Hbxo1q1PZ3wVd1+D9dcS+C6TTH4xgN/4b3+un6a/XHA8/ + ###x59pf/b1dxLe4T06XkTEYuOBc0n9z8enpz9+A+YS5Qdvf01+Q2YEBV6w2lJ9KeMyjN + ###/Exp+4whJ0z23XMTFQMhIaNggXV8GbDXgXj5Lgt/WX/ls374PR7SB48zzjczQcwuSs + ###feC/aLrevSELwzvYzXDP+5hR82IfKq6KilbN5lvYhd556qohjaLbgVjU9Q/F6m546j + ###ay6s4zspFourXbUgsDNAVc6mIQ09SpTVWHoKR5wM6K1RET9/7DFP28D8L2r8Gb1Ul1 + ###xgZCB8OoDXQ01XiiVhDfyan31zGWDu9tfgDML+pGKMRX2Hy8t38obMB4SSpny/ODoP + ###h00Acl44MXhv2D3bevAt40NluiiVhsh6OK1QT/JTlxdbs/pM1S+RYZnat7Aum235uN + ###I5/VW8ij2xZ8lLf+LIurysdtm7G8toGHIQMTbWuO5j+MyGtbeGi1Bvcle3oqJq5lC3 + ###YRVtb3PFVjysyr2DpeZPKveQMGWc3gztsYvvDZM/PV5pa+Y23WMrCLZZYb62vrWNV8 + ###T80Zjli0b2IKtrgrty3TF4uqys9RycSGQRrtqDsKT8hHzP7Aacbo7lBvWS/Yuzfpvt + ###69KUnWXsnobW+3zsviHmK8772jfT/Jh6DZH3LjxW9cIOJjhi5xjkxw4h5iFT4GCVSB + ###n3gHJAEd3wDQ3A4yYDEowIDiuN8fsP5n9CBUn83UdjzgLvyzaTQAvx1rN+6tGNvd2p + ###US684id7aL22PYzdNigyFdGlwOjxj8CP/Au5xPo9g4cHCT87ll03n68LG3mlib2ekq + ###FIZRtXmOAS8Vr7B199BE7ZK8NUVO/EU13aV5BmJi8H3EDXR0QbslRVshZxo4NOk44N + ###JhEnTDYT8OS2pfrFj95lCr6HxnMOjeswTodRhVh/0+2uJE22bfD8O6lLJkKIrmG7zm + ###ew769i9mCAgT+SBIlfUeT5ivb0hswu6RvpKmJA8+D/Y8mrF8zfMic/IqGs4yRaAoZ8 + ###3UCVo978XdW4mlsNUCFMDS7d4/BcakqKJpVIf6zUYZKTBiNKs4DAuH2SN62xuErU/o + ###eDzEmCI8W2bMVzuPCQ9yUEyUiIpIazwc4hKGRYulojs/fY6p1RIXiCpSljKIkQvuLi + ###1eDqNuN04k87TjsEjBOiG86L5ge0C/ioAqldgzWxBO0kJvRVJMRWHbAJGDbM2JMXPw + ###FXWzhNfR76nz5iga4PVpfgva+Br3Pr+xC6xVbB1w4iptt/mNRpyEDBYrRUcPf8VPH5 + ###i989MxsM1r5b5isio8AOcbgS/SsdC2MCbUKuZ9lTAITm6yPN+Zta7uVOS5RHPbU38J + ###RY+W/gbb3ERODVWJQrpxr9Htw6YqezIWgk1QnDkc7yBzML4oPdK8OVuyJ88IQ/LVDn + + + +Valin, et al. 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Expires February 17, 2012 [Page 177] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###wHMU5chUG5vM4mY7Eb9dxXqjcRpBaKXAPp5A/Ndc/mPX7yudTCxC03MjLPQF/ppDNU + ###QfytXDfEgeJyowREh9pTxXIXhfni6WIsJ1FBMyLLjAAkuxt5ZklfKsxS5HinZmk8RU + ###a3qKaIFSRq8cmkwnb1ultdeVUZ1eq62tdvmJb3uz1+/W/n/Gjx5sn6yNf/6mtrqfy/ + ###K6A5zPS/7/HM9L+Z/jfT/2b630z/m+l//wL6Xw8VQHLmBxEHtT+ZyUW/cvU6Yib9rk + ###fjw2wRUN/zhcfXtj8AT4x6rdS7dtTiOWW4choErUF3nOD/5qI74Jc99uPejyDMK53U + ###hBiPJA4vdk4OmsH5wUVwvrP388ElY8tc7+QJTND//fJsj5UuKZQu8Mm9PoIySsqoKI + ###hBMJHuxHOp893O/mE3vH6Zp3EIPeVdP8bNujWKP8cj2ncYBo2MshOiMH8SX9Fn8iFv + ###nB9fZvQZha0bnhsXdyUfBL4+494VbFeHB3sTRouxVDHPJR0VwTYH22Dckb0IHx3cfa + ###vYHIP2dJ9fuUoP0yHSy7ycIsk0ZQs6EBmCZDJp7wXdnPRBvnUxrQxIgLyKRvziM4oZ + ###9yPtitSEEapERuQKOxU8qg81N4Qy6C4QYw+aFJs/b37I7iADJvDAtiSC5T6FdXQsCw + ###NEMHZp5LpPfYma4wSQgwTs4MPqs5xLA4Tro148QnkFBeZRkSRRafxhEwJ/k5JEPRJ/ + ###ZLma8BD6EBUV1aVhlir+mJF5YXR7nFU3zcxNbpfjxB6lXFDmtwld5s+YZ/4uorDNxD + ###4iGO0YREpyJSk0m/lz+2YcDe+LTe4j55Yby/Jn2De32OU/xdwaPFhsMKTBEM/Ln0Ge + ###6w20jRe0WwxhF+92+T4CWkY0qgi3TjRekqomvT3rNXZLzDUct+N+hcVDYAOghMB+R7 + ###v5F1RPM0YDXUYKddXtQXjf7YdtivgObfKOUSd6qidFmgcF09Kxf2a2I76r6CU4yj3F + ###DQqTJv5TxFrN5vmBQXLUq6hh0gocRBEIRvyrjPLBjwDy+sxJq6afXtPfp94QBVC4Je + ###Z0LfqMWpjRcAJKBslF2LuOYAYUajH1317/FpZXkkDb7XAUGgy30DDz9/0e7fhn45Ee + ###JlKQZ98Xi42VaLQvKKUdfSyzjOnM6NPkFSZq6QX3c0U5NJIFUSC9Gnc60TBhvb4M+j + ###P1zsXZBw+B/6eXN9vRN5A3xdj/FPImDHAaedPGh9XnFPLmBcmbsq2p5U2Bvz+DvIno + ###M1DxCMafgT5jsbBQiAZ+hLmY2o++5xY5P6ELiSh51vkUWySM0NoiHRjakbVDqi7lFt + ###mcwL+dLgttV91+MkL+aQ4TMVt7gSwTvtKFSP5vQ6wA1olSO9JUW2T05ZyMBKJj2eeR + ###4N+JyKMj11sr7HZFslWQ1LQVQ2+R7TRADnhii9yPnnSLzJA7RFmx0cs9UhItp/O2iD + ###GDdnQURrLlj+m25abq1OwzLX20BRSZ45xii1T70kha1lrCskbTFso5K74dubzhGnah + ###y7O9kisspKPzqREIscOXg/lcSCQ05ROeaQQULhNJyU/3ac8AF/quxAb26D4PkcUm59 + ###HwXA043SfthcSMEzyhUTJZqk/HLOcHrykK2cMkQqO8EJoAMoBWXYq0QK7B96u28vJ/ + ###v/35r//8PxnfBslvwyC5iTuPCv1OzwT/7/XG8qpz/r/WWJ3Ff/8uz+z8f3b+Pzv/n5 + ###3/z87/Z+f//wLn/0/p/43S/56IM6eD/2B2TmQznKeTAEVcCkQq4lGU15jb842MytAU + ###icigWlHt2/BThHeOOzHeQQY2yiapQEq21J7jlhSX5zE+H/Wi4fW9609NYeAP6BNCd1 + ###cRGbWpPQokzjdXPtS0UO0X4eepuh33WnZ2aqPRxGE4GHRjycEJJLszv2V8/i47wPbR + ###RAO4F7/ZI/P4bqvOjrnTto6uXaBbf5TtuAIY6YxSnty94TW//Ap/CG9u+Ivp69ZYS/ + ###8CYKtVJ46wyOZGTt8xXq5tWH7f2JwZoCvof+50v5TwfYXdiSDAd6n8zpOrLXAH7Tsj + ###9ZkRSLhDRQEub+SnZivECxT9L6kgD7xf0wld3xUmDVoGNB7zrwRP6nKwwJqTIM6JTS + ###Fv7ipsTkSkuCduBjPLxaBV3sEin/bJmPQjBH33LaQQHlzM8D4IGX+yuVmwJsecCR4x + ###bGuLFqYJHrKbXiQPwrpRh/QEkAIxLI8J6gMmqjCGvUjV6ZpPcAdI0CQHoN2EIKeDFt + ###KNQhFiKLobDUP8TYc7f4uGfVbC4OLmG67q9EdhtywHJSfsGavd7Qn9O2ONTzMZzkTo + ###UYirP+HweqyuNuEnvgkgc9K8TOxCGHAOOdg/weWKf4DHb/8RvioB6q2tb2z/Wa2hsc + ###e1/9QaM/vP93hm9p+Z/Wdm/5nZf2b2n5n9Z2b/se0/ovzh0S8H+8H5GeDflxFQhQMQ + ###FzP4BRDhqk7+N8Hh3Z2Qkz3fjn6B/rpJ5G/7+PwxbR+f67HYV1fGGBQ0GIR4Ngpcme + ###6qOIfPSTQaD3T4gaQ0l9WNBIGk+EEiHfJMVZDcDnxPUQ+KThJ8ev03+500rmS0i6es + ###viF1/hRDSbebM5RC7XLvEundW6jdLBRhHNxudBeP7rNQ5TRFqNrzxJp43JD2FBx2ux + ###OGhBDCFh33urhqfAM83r24+KZDy839h88lKMXRiJLdXw204/qkoXGrM/eMMu4O2GOU + ###+pso8HhyP+9D2yiO9X33e1KDn+QZ7XpFy65sz+hCPklT4lm7mOlvGI0WDc6YIoCVoF + ###C5UF8emEKUi4OrL0EC4mLrxspXKd11qQzjBVCEJrd+hnfFvsRtkIaL9tW6CXu9qHt6 + ###5XP12eMf5blE5lO0M9AgWlHAGZfPKC1ZGqg33MRMBYigqtvJ3m1vEcTv/ctfUg1vWR + ###cUeKGXvsp7uxeTK0OhdGW81gnwuZuHXRkL8Y0OKSXdCJDIEa6AXtg1G7MbMQo189qK + ###ewXa0oXy2mpHSTyM2m57dltOobz2AIlHvV1+DzIP06pQuomeIL4EcJrZhFkopwkJcm + ###4TslC6HbEe5doSyxLacRZquqZaXS7RqA+CxtGialXk4HWjdpCAzBUFGEA3kI5nP2A4 + ###0GfPrBqmf38q8ZvbvCZmaMpp5XOgvzp9COkpI3sGIvKazC04ZbQMkDMRPxTGitu43e + + + +Valin, et al. Expires February 17, 2012 [Page 178] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###Y+jsT6iXEZ/o1mg8gDFrYyZEgmNhkPcGXXii8aw1ip8I9rWt6N7vtkj0DnWNye2JeI + ###feoBb5UGG9g6UHPv9Sn+ddwfJ13KgUwKPhkNxODk7PBbEypB51S2sSUJ1z7K07cxpQ + ###EQxGtjVD6qytS9CIRt2Zs9bSSa2EvsmYFkid24w0omMy9LTKs2za8vH4GH82FEqRTU + ###5HMjHqE4Mp1QH46HQpSmqesRg2lGI890dobRb2NYD4Zw+pSD6biDqOTd5nv8ANXKbn + ###mk7m8xQEPLsIjVHqcJzeMHKXgWuvbz5XgbhXjMBqR5zzpAsECkjxikyde4PnYMPQWD + ###aNhytq+B+noOH9Fieh09enSo1rBxAk2lZ+6bTCHpUc7kOZpN2SMN5u+SlBFZdqjY/9 + ###d/PgNFWpDmAjQFvTg9Cw4uLs4u0p4e4rJDMIpUMl9XThDQgJAg/vr99zxxwREm9Ae+ + ###P2TLI3Lb8CWsFTfJ4rCL9/bIU0jtBRSmo9eiSHNoS8e9gnbIyOCu/VumIQHVSXSWI2 + ###/oYJkx9GwT5qL+mPArTt4hqx1jntXpdNwQS3zpj2CUOyBN0g3ML328wNMKoVAC6zvi + ###13dglvpDPIcZD+TgMA4iDGhlgxFbT/p4aSwkl6C1VIZl7dN0F8D+qaftAytRHgQVHi + ###U4Pjh9dfk6OGmyBXa8EzRf75wf4K+yKIVVD5vBz6//B+P/ewycGR3PU89QkClCoTcv + ###he0yD16o9cELpgXjzi8EkfC8M9uzyN2JBGmRIsp0AY+OSensHBzMewj3pY4KlIUF7K + ###4DbGnUSG76w1EQDoch7FdyaBULHxUH2rJ/SLiKTI8Sub1zgmObGYvRL9T/kJUsmiJP + ###CCcXW+4CuZfARRrUzUu513ycVcX5qbwkg0N0P75Mt2HzAZsH6MVhrHx0NiTwCFgXRr + ###f53PXvA9HOIZnGqJyHDAahNjRnjJffaCiZo3C4QcWgyRQV+gDeC7utcTe03FflPTnS + ###oW7ChF1FUU/NUtxVTAxIyTMA31rdP3q33AgwJ6j9dT6L/xabnaxRfY8tZyLZPWTbyW + ###EI7lAz8/CRcXhwz6nNA7SZUakw+aSTKGE68XSalhSLI+jnmeZTGespayDDIbpw6Bnk + ###1ubSuNdFPz1j3kB0V/tnvYw/zY8W63v0FE+aXY3FFIJTq9LGX5GdiPagBu1Hciey9x + ###/d/TSygVaSxXaloTLmNkeAzJjb4mL87FBOtZtSC7xKgUeppfgYhqen3bez/uyPrs3R + ###UxkjEZVBBrFo0leuUbDcSsFya8QCHSZh4OTgdE+EBAyaR/9zADiCP96en59dXB7s+4 + ###yKadxsbvHR2X1YJmnjwjEhe8vNtmyVvgqS8VVnCKXsjraoo7/A0nyRV9+UZR3vY6s9 + ###07yV1dYALdyUE+9L3PO3eXh0Cgzn6HLvNZV7f3QKjCFoBM3DrA6y9cANLz9PA4QmgP + ###4Ydsy9/UNpyrS/1GswwuB0l4q8LLYBPrwfTyf5it8E6rBFH2fWfFw5ZwoNcsKagJLm + ###293DiwfRDyZD/3ZE80fSy7enlFwamfO17LB/hx289NZx7Gd0L0c+wPBHw/j6GqShXv + ###SFNU8vyFo7Fv6Wgvl/tXaHPMO1qGCmrjOn5vffjZ/1hvN7Tc6yWd1Pt3gFxjFBmR9X + ###9PnEBDuWc4+Dh8QESX4k40GpEFA51g0hBkNVQ5pr3oSDyL0uBotFCr9cWMFC2nXLFo + ###O9zZ7T8Z5z4c1tlp8BjkyvMN60bV55IriPz78Z3LJpR4z09oDzm5w231Tyeuglvwmv + ###nEyQU2IpJm38LXhTX63YDWYXLIAPgvb4fPGoB+wuEEGSMhp3ytmtmwXpMuDuuHN0x1 + ###KPlSfVs9nw2IrtgpV87kZmJfpjMncx156haff6vSpdQtIehaZC5SL+WISySw8ZVEY/ + ###/BQbKeD7Gl1DDfjSF9XSlQT9LnbDa/jzc9G+aDUtHofJ6FWILhiY/9et5ocQSTmrt5 + ###yBUTWixrj3ObhGr8838vrqFltbXV1eM7R/3x7KzMNafKbZbN2yJlc2ZY1/oF06T27M + ###F+m+OzL+eMm2ENE4O7clEuQpTUDW7bg1AvHwjLKfARZBSlTpuXPEz4QS7+7t4hp4Ri + ###MTL3AOTnYnnMlMgMFMEf4gGN6bAPhXNZJNoFJ1beE1gJTEP59auZkyPHOE76y+Kn76 + ###zdh+uqMBbnR++f748jw4OTjR8Ppke6u1kJOf+OS0tiN0hcntYIZ3TscU8tRup77hq/ + ###7ghfutdJ7JZPnUWnmRlUx222yYbscBTvqb59KyAmIo3pRoXpbYyVv+jVJhv9+tsOeT + ###1UeYvoD87OJRYnGpcS/GO2kbDmsSSMuBP5/dFIb/5GngX/PD/wQAnj4NgCsugI52uH + ###cTtT7xsx6QpTCmB7/Q+BmkurZPN8xmPM5xjuY8OG+ZbK1c3ED8j3wlwW/QrdlGXJ/7 + ###lWcKjP63hTep8UoYMrUybX5zwlBwBFW3iZYOklF8S2J+aoCCVvG0AFjQ3tnJ+fHBLy + ###8nNXN5AwL6Tb/bluJsmuRri8DMtRUhpzG1ezMF01q6Eiq5gMBUYV1pI10Jdi1SjrPm + ###b4stS9qG0t4NG973SNFL9jGRa9Tej1ox3gU1W3FVlD3hRw2qzKCPp7BtlC4Su2tXZ4 + ###BKwCTejMPe6Lj/xUeK/p5IcDlpvnsTNMfDz/Hn/tBWAa0YGrLSl3CI6NTqSAozAjyD + ###b1vktvJoctt/WnJbX3s4vXlIZzK9pXTFQgS3+scRnKfSZILzDHIywa18A4Jb+9MR3M + ###rDCc5HOwUozrOQvxfFebr+RizuQRTnWcGTKc7GCqDJneT3OxfnR6evAhDaL4/wHvyF + ###OeVZlLrxp6PUxiMo1TPxBSjVwwG+F6Uu/7kpte4Rbr4XqT6KKnd+eWKqfARRPkhA9N + ###X6XkSJ2Ns/OIb/7QXNy53Lg+afewdffpDM+FgqVTrTfh9D5oj7tDfxNYaL4fanSNEF + ###g6lmfZpr0HJ7TBgDjdfmvY0cuuKWmdu4F1A8tAnFK7qAY30UozAJMnof946llU+hyW + ###8vdJC3QC5eLp3aXXhnnLrQX4QimjrGzUHIJqdXx0ZFJtXMU+GcFSia405puiV6cprL + ###WlSbvtXEJjaXRb2bSOzra+s+is5pLotxQHOW43vB5rKIBZrTeCMroW4zp7msBQ7N0S + + + +Valin, et al. Expires February 17, 2012 [Page 179] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###f4QFPy9uLd0TuMqsNYlr3mqeIt/JliLTzsbg6OM8B7ZcEI9zfszrz+hMwYS0Q9TBnS + ###1pxX2Tz37OvVyucf3rv3ydzbvGYbeUd+HhgBEHqLhytAQBewXILdc2P/cU2zVhces2 + ###xOHycT+ijc0PvMhubya0sj+/tdfg0D/iz5isK+01hlVcn6S1kzUWEN8iCoeCSYWp3v + ###XpYPN6LRocltL6y+oKpAhXhKDKutNYzwqlGHJ4FC0yHd/4vuWrHtDySfDBr0OSLKUv + ###wUnPckcYcHNLQNrgvkSGRm4ieNlxWJFieUqGWittnMHx0r8Z/x8cf/BNb//iQcBQd7 + ###jw7++W+T4n/WG+vrdSf+52qjPsv/8l2eWfzPWfzPWfzPWfzPWfzPWfzPWfzP/PwvGJ + ###FTJn45wPgVg3uueg7hA3AN4G/D+K76JUJmCr/fvamwm3DYrnI/XeA9q9WoGyF3FPk/ + ###8P4OZYpMgJmqnNx0T1HnhtEJXbRYZmdz8aeChGc+7rVdz3CZayUm11ZMtRJRtvl2dN + ###Xvf8rNyj0xF+c8qS/Iy4M39RUVa4/6o24Ubn5De2T8N75L8Dy2C7BFsXkKylI02/k8 + ###OcuupOwFfHxGnhXAPWwBotN0+s+idoT599Ddhv+SIB8aboqcDjJQlN2fZxbnW1fBm3 + ###V/f2rGCjzp/vwZROdb3eDNanZ/TLjt0FXqsHWTRTZFwwrejoM3zx0Clf3BqmpH/Q7S + ###5+gLXkJXtMPJBYURGU+rqO/Oseed7E/fgRdrEyWaDCT77UMiIYw7qziJw/4XmEjbWg + ###T0DFymgwT8ga1i9AvzK1BfMr6tc/KGvxpolNQOQ8f9/oCB9DbUIMrUGtYaFBo7NYjm + ###PAGihAgD2l0pyCh1zSd+HeAT22TH8M/CgmWE0BDX2EcoyRcg/1W1QnOoPuhjha2bWr + ###5upm41U89rpp7TTMNqppHXTCOnmWWrmeW8ZpZzmlmxmlnJa2ZFNaPagel9L2l9KC4z + ###yW+SJhxXUbGQaPl+gLn7aDVoWn9VA+Q85nTLE1ADaLgMiNc5fRMVOhY0/VCND4xPlD + ###3FZrIYt5njHWxGvq6oZhp2M40HNrNsN7P8wGZW7GZWcpuRE62bqT+o05rdaS3VqU0M + ###qhmHb1TSS9eZ+SRCPe/xU7/+NHO28TRz9vyPmLO1SdT/oDmrp+cMFNTh46es/jTro/ + ###5HrI/6RBbxIFw30rju9MdDEHwejew/giLrE1fTg7C0nMYSRvF7NI4aEynpQeCuPHxT + ###ROMjai/GYPAER9XadIUu99gmJZPJqvbBC6przMgft1G2cgyaQL3qo07Ti+5Adbv6ZG + ###iLsowW8Ra26CqPcdvpqz5M8dv/Ixkm6UlszBPyf8Hf6479f2VteWb//y7PzP4/s//P + ###7P8z+//M/j+z/8/s/27+L8v8z3Nw0Xf7A0pK6bcixLXnywjYGDTm+cIDqya+Or6EXV + ###MmKJuYZUwcexSWCZb4SQhPBdQZ91p8m/A8VLT4TNkehK+iUSB6CTBwUsk0kmIqIXy5 + ###ez+CXWCK0Hl2xS076ozwT8zyd8weC6EEA6Pg/nJBEUoinaUpr549ZmziwMzeRKdAOQ + ###8NhwelUQ93nXzBmunbsbnPFFmcsOmxMeV42jNNFiejSzl31gRwj1DbNM56lZx5pQqo + ###RdntlCV+tA09NT34PhVYqJIKSaSIQ6qlZDfvcbt5D7RBYJZnsPsGp29PAtwCTw+OgZ + ###f3HFM6qpBmhFEMHasydum4QzIE5gdo+qMnEKKpx9rRyk1POtGalZtHOf65H1XWHR2I + ###n9AVtlkrNa9GvElzNG/G0fBeUjDTxKlpxh6KdxheN8DCnITWYgbUFAa20MrMX6fWMI + ###3jH1quvjVpPTLnGV+g73xHr1mrRa2U1AL1Lcv0wmxOvzDzmaoCKEoFb51Xf6aLiRU+ + ###ecHq5nQ8Ad0sFVEDdwjderZ8a+FlZn07A5W3vp1/ymjETipmA2Gs6xr7uOiGzXVa8m + ###YWy2kpla4s3aIvv1hei27SslSLmVnGMlr0pi5LtepkuZmIQ098RaO1q3jkTkVua7aT + ###tge4dA6XycApv+hUe9mJd/ztmTd4nKYyErllNpXO6WY35kvel9eYyuNnN+NL45fXjM + ###roZzTz+jxogW7f6Xhy+vmaMcunGov9i4C5cYd8DdtR2lNN0820XZmPq/lFx0byw+nP + ###VueB+P3uLfDI99wi8S4cxujIf3ye0awV/ufZM28ZDFiIbVIil2llXlMP4JnVuF2HMo + ###Xm763udsobKSbx4uPusN9Y4pVdmrlLp81b6nQ50ceJyoq0DEc9nb+U5IZBFAFNiRwf + ###lsdTXp8T/WTwkcHq3T5PU7ki6C5KZteiz6iFW/sElAySC8xEeCACvMurX8jmhlGSQN + ###vkG1cwNexEdzUq2yMF8Gw80sNECtLDvCIFEQYp01OVaLQv2AmmjcWPZVbc5QmfgZHx + ###0UStTBEbgx5O+YREQZ3FIHmJ6QzFZZ8MNySYr7jCervxCN0LoUn4Z3Q7CJyddAv1Gn + ###xvbDr0TgUnctsVBHHZ3yVYsI9uv/UpOevUa2iSlwUOQbY+IoLwNZMQzQZha4T3nALQ + ###nQSjC95spFyg3OS9J7Cw5Ru6ISXceURWTl2Q7i4l97dX/W6uzOm8Z4bUaYIC6xIm4I + ###M3brcvs5LUmXiArc9hd8xJSHaUq0aVxBS0sLJK70hEVzJSyIH6JFL/TNSj8MnIpIkd + ###6jZ9gu92tn7oBGM+6QNxVreB+0bDqI8efL2Ejg5eMFRuRWhm5Bzc20TMGp0rJLyOit + ###5sgF1cQ3Z8LXxBgjlsFBUSoxd/Dt7Ul71xfH0FJ8cgFrWSZtz2hwc2CxRu7jbGPHnt + ###KIAFFryp5TXsFPWHHhZluZghBrfiCQNgwHsLJXl5cfbu3OjDa44rZl9GFD/b6rDF0t + ###dFzbw0/nld9Gdb8RSuZRa2rDgZSa1SeW2KgnbUC16ruND45IGWKuzOZn4HNpTS0GNM + ###m2Pn8S5wN/Oyz/yTyxkEm7N2AWYkPqAEQMAeTUnCbNBRj80I8MYG6fCYs173noWtVj + ###QYCalD+CQDW6nX2G3iemnY4AHHrE/KJXJ0ev72Ev77buf4aB8tHGeHQXMHo5o006Th + ###5bWiUYvf6jkSI+HmxwPb/IiPa07Mn4SUXVEOnI/qMabFiWP0xRH2ihrmEOyPusHsMk + + + +Valin, et al. Expires February 17, 2012 [Page 180] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###4wrJTQYtZsOSqx27It7bx8SqR70bpYKN9p7WXRlsylYd3cFlzAvUOfs2REljc83Q7Z + ###7bg7igc8xXeBdTSft5J/2EqtfAwhbfza9KQs/GNW4Un4KWKYABgF69v+MOKBYvq9SG + ###ZVasHPK+kkYKe9M5KclbTUWjYGup1H1rlI/IPRI8TDVC4SbO6C/BKRwZvwC9taZYI4 + ###WdVOjI9cczB7/33y7gU7xIzlPPcHClVSqhSuPwnaI8iNPkxkKvtFdpRwLxdKEUjuN1 + ###/C+79YcwvaipkLHbWF3tZWvcz+kl6fNdvW8sJc0KZIbyVsn8CQTUS6SZVVmG+fjamC + ###KqAFelnrCgUPjyYRh1s5f87R9mQGkc+1UuWIQKlc7ozrmVw5Bp14ycj7h1pFJGPqio + ###n9chN3o5IjAriKrWHj90JqBjCu5pXU2T1e5nam4oukVew6sVGH9U5GYzndoamV+9Ny + ###KpByezDyGU6GI51D2UxKizOEDlQR3c8TfdvcNUty5WrEs2eTCS+tbLhsJ4Uh//aODx + ###kBenS7R5nkeHLjnrzAZa8UYy3lppIsoL6kgMmrLEnvQzH6RG5jpS/W1JIRhDy/ORiq + ###S1VOCtNii65eeNHV8xbdt1t4Htb0HUhtAft9GnLLVK2LkFsK6T5y88zMY8jN15yX3B + ###RmdOiqx3OTtPJImWpvrzDwWTfqjPi9VJIohCCCOZQ7KFgae5MTl+lpyKSkrZVlLaYF + ###F2dvT/dLHn4FZOSnrAqzL5o8hr7+edmZQ1/ZglUe1dWLUl1KNPuz4984svous6D+Uh + ###0zs4bue36COQwfQ4OretqwLwjtR50QtGdPwjPvCbA+YRX16Zw0StuBYq890IeZ7eIC + ###q4d9HfT64+sbfrSmzvKuxD6Y9AVoLs/y5XzMh9Ir22dAma3DPlTT8O0bE7QNX6YSa9 + ###6hQzrpprB7vpzrE6bQyeS3JfJ5/JBl/zQ63xtGqNMmgxCvx9DZCs+BKY1KGKPh3c4+ + ###7UfoA0Ingb4s50Y8CMwWI+/S/x0PGWrs68tUBV6K3/9vrK6Ju+0X4rIivKmwIqPWyX + ###IXaFvNWJf6sCkNCT9UDuJWm/CsD48BdISygtEvnYlTRE9EHfbujdkjr0A8D4n740Ta + ###fzwo0/WpbiZqn8CoKB/jQDNtL7T6i3l/MfSXY0d0JwEq5PTuQvC7fUE1px+qRQj6AC + ###DBvhD7JhKfr963RZqWAUEFcBgX9S9AUi+y0ISr0qwgY6wWwxS0n5YCzSeTKs0+q3hi + ###Rvu3xhBlawoGo6Fvm82Gp8rPwDeKI/ard0nsKYImB4SIX/gyookm8XUPr29lUXou5W + ###Uu/3zKe8IlJKe+OLXmNiWbK2CBAALrce4+qUF8xFUQPHcVNkI8o23btOScz8Z3AmA/ + ###CcjHv8asjkWPggSyjJOErooFUVxJy6l5PQzGIDYn/lF5pkYARMvlQwwviRgv7zH38R + ###TVKAbUWaeTRCOqO3E28s5iaAS8ac7ccgrnyTeTp6joGuaHit9tV/L5LOQuK6/rQm6N + ###9Il8Gh9fU7LZa9DAqwOQGRnPT+2NhOznT5Z7qX24mPYklQ8RNnz+LLwxRbn0GBWNeA + ###UcdxiX/RF84D5PDLP8kVjnF0zI4ytl3FXxrSce1TiHU+VKynYrgGqOr0bDsDViN2G3 + ###I9OuE3BhF6TS9j2/a5sShVnJFGzLqTnlAwB9CzbQUdTtmqwBqGB72w1UjTJ4jBeJ2d + ###W9Eb9rLMRpWnEJt8qQ+15xrAnvuWmE2NyTAEfQT+MUZuEzqDdkCIeul4SHlEedyDsm + ###58n/PGvVe4wnXZvFYOvpyc5MRlykvdUcdwGXkjr4XxQx0N8SJwR95e6Ab9PFbkH/cc + ###+VzVPszYGrmrka5CJEUA+go6iNV8o5wVfY7tHlxQFe0j07usAEEjt/DS6PTg7Q2y89 + ###dacRhmGLqBGpPMcjN3BXJtbo6rAbDr7iX66rYkFmUc8xkPrSBRkfgZBO4vYSuZlNoK + ###KCxyb4mKLJ8UUw6gNKDBGBCyO560Zq375CKRXdvzt7RJ/iS++jx4k0dbpaUBPR7vPK + ###pxXY0eg+eLNR4HAsv8gEaWEyN3WnaxpJcgp0FmYZQKa78pjWJ5VM8LPzmCKrDVPkko + ###6KQPUVMmZLKcPw4fWKEmbH3sYebRh1Dq8I7KIQpkWbA6857omEukK8IVv9dfywARzf + ###DapC9OJvzuMAnjp59aBNDs1t0E2hYj6Wr0bz9GKCKuQ27bM7STAsdxCxMDmRQKPZ/i + ###DGVQVLMspw7jCfXEcPjbQCaHw6L7cJrZl2WrdqelUc9XBwHotnCNtxdB33MH6CFC9G + ###IKbe+rZFfRskkzR4q97BPKFi9U0teXwITpA5oZ7lqvC84u8+q7kCB2bAsKBMY+p7EF + ###hFQFLK5CQ9Ep9iO6uw8Q1CvLiC7rVx2KU07PbeKqD/RuZwvwGAnLb+Fg378uZSB3Pk + ###6dPo/ctf0toZH/mEkxy8A/rsGXuSMxhsy+9xjI+xDr0rLZsvWRI9HgAaTc2bKWBz62 + ###UrDk+kRmf2bGsFfjWlxttMqwKCBt4O2qh9kGlc3CVD5geEoC6XMn7nil4nPIeinyjy + ###rms5IRjdKyHN84ODvdfBzt7l0bujy78GMOXB5esLDCq1AXjxG5ScNtBXr5rdEhDQEl + ###2/2t053X9/tH/5Omi+p2yE+wfHoLWdNCnN1AJ1KLE5im+jJu5P/EB2hw+eJssnaOcu + ###irTkD8w6F2dZJJ9/ZFz3c7+JI/KvnjyZa+LR9YPgWCh2B0BBmLfbkze6PqDPtKtfwS + ###7/yZUbcnHg1LA8oU3wM5CTg7qXqTbyrnEX8pPlt7nzaNO+1J0GwBOowbTjFNBgnZvv + ###qm2uc7437ovlXj2bfPMnz+rluXJS4O6HfYvkH/0iSC2Dap1L/Kn4n/74r58aIUbQ/S + ###7xX2ur9caaG/91ZW19Fv/1ezyz+K+z+K+z+K+z+K+z+K+z+K+z+K/5+d+a8fX5sN+S + ###8VQx6BFIswM2HqjgpxVkl3gUh7tbpxvxQ81WP+oAy4iBLSbIgvAMJvZ8spK9CRnMzv + ###Rmh7KZ3wneNFbSwQVlrD92ntHRh/4QWN1HBrV1Y3k50OaHLZVSwemJItfA5uMfrerJ + ###iGyU2xOVT43I6MkYU1ZZsydfni7YO166aN0BfeADNz+gPYGyJQTH53sqmoubHIs6Ty + + + +Valin, et al. Expires February 17, 2012 [Page 181] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###fIctWHT34VgXfH723QLDrnGF+nblA1Ylpl3peMDxXR6ydWhZ9VftODT6zKGZXuX9T/ + ###RA1XTdOsUdXwPvw6y9T9D/T49T+e6fKp+sjX/9bh/1dc/W+5UZvpf9/jmel/M/1vpv + ###/N9L+Z/jfT//4F9L8eKoBCyD86RfWPZ/Ww3klFMQhag+44wf/NRXdo8Gc/7v0I+kQx + ###/bBo+pCcpB94IOT7cH68N1XGkXZ0Nb623wOLjnqt1Lt2RO9IuX3ba/VvKVs5sVnMNd + ###dFXI0wTCNeaKcTpNuwHePZEV2gg0+dGGPCYtjfJYVc1Lhh7QZEwqc7xwFSOlcv6hN6 + ###ojg2LIRm78i9VvgYqJv05GdbwmTmA5gVbAJ2gi+4ZUsnXODi0h9dgwR8Ye9AwyMidw + ###qQ1vj4PV61Mkol3T1B8MJ2OBjBnqGdbXGLBcFG7oCWTu96zpLCpP0z+c1sUlwTI6hx + ###hjaMkXGniXPsRMW1Qg3f1T98zO5N93fMfenRx5njoAJbK8wdzPgtDfJah8rP7a9RrD + ###+OdX+HFOzJ6NHpz8pujk6tDfZRpFv29kdJ6t+YaenlLbiMJy/KsIrCOVR+ila/sr9d + ###TqP8WgdikEKh6oElBfsb4T0R6oz7M/vwif/y+yRyZeQ/ecGi6eDWcHNAh2dffyJAtX + ###SPYN3oc9S1HPl5vPBJ/cnz5qxH9ccDC3GmADXKDxyf5bGb0186GHZuf+ivYzCWicwD + ###GEwm8/ExlpMmMpbjC4uxAEufMRa3vwcwFq+9Ek25GBk4q1dJKMJqCZpHDnD+8Vnfpl + ###sISaGV8McthENMeNuNwmRUTX4bg5qVmLbxa9SUkTFiMEYxH1chbuWkWXKlEhnmb5xr + ###w1ZP17uMKTIXB+bxDQZyHkoewCRX5j6UCpY+KbcY/nky8iyujGl/4z7PSpyBPN4fFk + ###PcAQLi9jjkEbGR7qNeNLyOTWzmpQ24y6d9NVm7YYKqrbmmMp+8/u4L9sfvABTrcNKu + ###CigSoa3TnSvmddtH4iAUVjRSe2g5mtCf9Y2T/eTFNiXxZ/aXENwBHqAEbzypINTipn + ###LcEKXOWrL7E4vtjVwlgJUl4nEDzZR8uwktK35h6I8UVC0SKMJvsT+D35b6mKxB8oh2 + ###mhEWFRwz+nuI4Cim5AAVtsE9tw+K2KR8an7zteebJPNaF3fD8yTacBNrZGFtmkQbj8 + ###Ta0cOxth9xe2pBMm5HaQzBOz+GoO1vhSH7m4Cq3+veB8SmUv0RXfGUIKjOYknaE2R8 + ###25sQI8tFPcZv4hVdN37syv6mlFMUHSMMfEshU6wRNMSaEkGtVC6bXFUHE8hWAP7Qib + ###H3tA27DI/tMFmYVGWn209zM8RM2nfMvnX0ey7MFug7N0eNGVZjUt9NYQZBs/ykp0jf + ###bmyOvL4t1tGnOpmAFBr3+FZEJOFZXk53g+brg+PjYPf4bO/nJvExNe7xLSI8vEr63T + ###GeH1A9PANgVxgw1OnbYlsFFolgDfYiSXEs1cEEziWR9pTcSz5FFwn2PVsks0UyeZHw + ###hEmRN02Sqdt5kyNxKTUvh5uRvE0h6qHpipUth2pmWKZTGe4kxOG4Daqhuo9lwB6Z+V + ###ONLukugJ3LUUm7feoe7UVWMMnEI3WnQW+eXnDls831JCkqD7Ohx+vQRSG2KPSBEOM/ + ###uencnNAaqi/9jd1iujZh+SxBIa9FRGHHPT1CZ7+bCO9RZqUMXjJEIb/8PlkwEjGxHi + ###QZSdS2HisJOWV8zO57MjfZl/OtSF8Zsh1/fJuX1dd05wC54/KZ0WRfdP2XZZvYnL7E + ###4uXEKJZNBfqN+EFCn+cuSRStCgs7pnVZk0zYVpOwqEpG8acivXkOb818J9GGHbxgvT + ###7oQtchWdG5hEHsdzRuO0YzC21cwnoKtImWSpPlFTkW3zHQlGMRUzSVSPhkepJTho9q + ###xXonp0iH5DI2f/qzmoyv9MmPPUWv0OybtMJuOLTXITkL3dyTWp/ESYWNezG5NsG3bv + ###+a6kT2JKEJOeGGrNJkjoAPLHYt27zdPbwwDgzldJFhegJXMPA3MQ8ptsddadMdy3mj + ###kbCSMmOx/njk28GKcD4qR0d4MAiPACn7xLuJOM7oLuPIzu5zYu5T5UoWdr2e5PhvJx + ###5CIxzD6JDVBRrlBo4YluL0ffauAqI1Hw7SdCrJ0j+tNo0mkkjbkUmmxclS1Mvz8Dee + ###CURChKmpg5NL1lPEAILPhMVwJOF6wGKYEeY3IUy6mDzod1HIHX3pi5TMztYV60I28W + ###Wkn2bsLuZ0cHy+x69GCEKQhGe02M7LQJ13mmT1V8vsz5iMvFTXU/ZXz+9PhGOc2GHR + ###yY875DXR8J1g0XfC5yLDYn2QU75EdF4NHKVhgVG0v6xE6p6dOkQyg969lKYJ7fjynI + ###3Cga0sahLjZ0dQiPO6HDLbxfNRh8tQ89ZE2CAjDyiNe2XN7xAczfPyeE3rChcAsI5M + ###zpbqj0gco2Nf9fufYIkh33HRktnfPAg9cR/YI4YHoY4n2qy4JV5XS3WZ55HwHvC5YY + ###9tXmFzPo1XSQIHwyHQ1PuI++bTgfeG05+XwG7HwZvn+UNyx0f9nYx5XmxWuljax1zR + ###7ajf6ZQn9tftf9lTYRsK9KvULDxJQW8CaIAZkSAy8Snq5/HpvP7yeLfvBBC6HgIB46 + ###l1OBrGd1W+5uH3uzeUzo+BsB73rruRMGKS+C5YgbX23r0J3p+Eo+Bgr6DMO+/ZbTVn + ###R9LDuGkR4KYlF4GXExaVd+fJUQ1d/rVvhOyPulFDt+T/iCh0ASgOGAQ2UZS7z5PktJ + ###IyRPHxIS7FcDD6bmRIUf7x+S8umuVoDfo94vjQ0D7IpzkDRdn9eWZxvnUVvFn396dm + ###rMCT7m/s7XC+1Q3erGb3J40ZSLRR2LrJIpuiu5ePxcj+JOOAiRt9wdNQRTucXCgdl3 + ###RWKHCsgM+x5116WUvRKu5lITnDmOh3T8dIwv0Yj0huwgHSh0X7pdPmm7LH6OhvS/MC + ###qFYykJxtrvUZa7MeuQUfCKNtnnOHwDl13Et+c23EqhgAWnQTkd1DFa+92NM9Olce9T + ###r9oww9BUYvPk0GQnZvHa5kNFxY/pzgSeX2j//yAEBoDGlbjoye/ifuAEUO8oz+HWXz + ###t8yjvaLjR7eDPe721OCp6HzSuD3+5k0fA6ZHw9vMC/WF+wexSHQPoqiWkeZ9IqLs/7 + + + +Valin, et al. Expires February 17, 2012 [Page 182] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###gPizS/+8L971w0yDvDFYPxZ/P1zvmBjQsJwsSnKId9HQ5vm8B3olfcyuAK5D78P2X/ + ###l0DIE7pN9d8cAAMe4ukDVJ6mf8+OfXwYJDeDYhA8evye/smelGXdeer+PeUGGKPuuJ + ###hG9C36Pw5vr9oY76JWjP8+ef+w5MlOR9HqivWPKifffrAm7tje/oWgb+/t44Ruz0bd + ###8B74ZztqxUnqSBC2twBKoJl/toX/c27h53/wFv5GbeHZ3jnfcgt34tNkmZwK9f+gLf + ###zS3bs9dDXbwgv1P9vCZ1v4P/UWnnIHQr8lzDfgquVL/CCGYsLjfQt07DcL2y5VGC8f + ###C/suJNkgG3eTuOkU87PGaF9sUaakLNSpbjw7LeyaTfHZwo7PRwvLZG3WhoeFLNojiY + ###ff+IySUXzrcXtCqF5FIxKOjrFkUpq82ga/fMAOglOK+t0kIlcHNeOrK8pambo49SdB + ###z6toJOKDe27Fvtnw0wdUau4EbzZyaOSx9PEAH76DHJ+9jK5yd9HBUS91PUFJCnsnBX + ###x3VV/ykKr/xUoCSB4kMkUf4yn6WGcY/TaG4d/ry4V8SQNLjVpR9QuRcdyLwqFxzomk + ###LE2OUbcbD0ZxS3STiOpNSsl8dc+SaEQWX9jqegmdM4tsL70+hXb3DEAvkeN0UkE9a/ + ###DR6zE5SI7PM87Njs8lNibPmyN7eo+H5+X1WV9fNv6514pfzP1j3Ogy7LDHzUMlG3t9 + ###PWVJCkZUQUxexcjrVfxH+14qNuicwQ+GfVyUAX2a7EtLUBfU7x6xPic6ArhS/kf/ub + ###l7n8hjGns4DAPEGQCw+kG9yoKBK5n94S3txG1G88CdqLgDVanGqqzU+L/6arVeLheX + ###9slJBeH4TQHiwMAUDAIP3EclBYwDAFPU6V5jplFz8pggKzB3O0jYxb44bcVdprGahX + ###v+5B01IRQePVuOU52SD0Jktfy4B/QxhRdMbvMxoz/f0Z2a7PRxk6HBAzZp0Xo6/GiO + ###zzChULt7uyL8juouEe/9p1tqeH0eXi7rKXwyOXgfvHmfraDQoITzR+bYsvrzwEWDw+ + ###O0Ri3FsPFfygIh+uuI+GpAOn3Y3W6lnWSa/nrN8fBz/JnisPn6OwnvQDwRRVjYwW2J + ###+/YA07q2vEML9ad91f34NPzVX7DaUn0p44javCRxO8DrK+mTaB60JezRfPBQtFE3oi + ###hG1qEyP7p/90afEtpmPpySd28KeAFCrzBxaykTz5LvDrIA8cPP/gufRQiUzAir/mv2 + ###+O+RMcokdXb+QaHlo7e/9NHyAFbjm43s/vbsU2Qc3LzVyaTxOe3+nO3x41zrb7k9F8 + ###OnU0bTyaT+oOSE+7fzxrVCMiJXlRFZe2Qh5REHkSEQElO9sPYVYWgWrtKZeJlqTzHw + ###kmu9FM6jxehaepp+ENGfi8y7Q9d3aKTwGEptus7owD++3P6+BG88q0j3J32uivRYaB + ###3hXW8eRMJaTbK/3bD16Us4bBvxTbjp0wNAkfEB2cQ+67fGJ58yCr6pAh6QQkQB7sx+ + ###i4wP+uNhtRy0mpsYNJo/cXnjc8pwX8ZkFA0CzNiqAqHL/iz6xGKU2HWK/lJ893OQ6n + ###OtYuATNIzE2ZIy+i1ivfTIA8wcn+mf9yB8OuPLC/GO/2o+KPZRZDIZ/FDzwbc9zAlu + ###0LSohoqYZBrkkOQlwfSWPKb2SsXE1JwlQCzMswRGISd9S5pLi8V+DyweziG9V8r+kO + ###lrTHhFRok+/OcPFYs95fZ269xVNo1OyVG4U6IQsTBOFEmNOG7DGWuCA5ZW9kU74jZX + ###hsafdq7iOydpZI9WZ5wDuULqjN3ft1fXitOJf96moJOijnP+Sd0XE3ko8nJMjGZS0L + ###XO05tzQXoYkW+reS3QCOrgt+vMDwbJvn2ZT+q3ciC82kCYnOW/XqzZAHWG0bTgpICZ + ###BE7uJNrgYKrcPxQctMtGI7XSU7f13TAcAFM0CjrJNMD6TRVTAov/TPRUFdkgU/3hv0 + ###05NG3gzgwEmLXgjMUkblf5Foq7CEQAE6owGW95OHPPWNpRtklz/rtfjM21VA7OxiN3 + ###f1ZWUT0saRDnR0KpG2zFnOphW8kUPYy+SDyEXVP0me6sCNl1+8mI7lLYfRHJ1fASM5 + ###agjN3834aYNNaxZ2XejeeFWbp57M241+mT3JYVLYESekd3IJS2Ro8jsAfEpStIYKmu + ###piQwGzlKgh32b5lMF/p5BQMI62z2qRBCotafFUVPuQa9fdGZ0JF958o+LxLu/MWGld + ###uXQDlRcaovJxM3FaIRxhjDjfsCijBuqak3buRZs++bcF02f8598+0+U8+/eZws+2zp + ###YDu8z73RMCf8k7tXGtUz+1SGWiAT0e0i3p6jRDGoTJOyjJ6GPNoDchN0/FhAMdeLxR + ###Y09bA1M2k8OftWFtps1E2ON5WHuiL71t1vk30I5d6yL4hW7F6+vgoEj+BHiIcXOycH + ###wfHB6avL16aWqk7QcuKHpdZMgfA7JRXOB5Zf2b+a7Gg8mSyNQPiObM1AnTeq/IEe5c + ###R4a9OfrHijABWKADRNf08cCWhif9/JtWDv9FWmPwF+v4gwRpsopQkSXgT0qShbsoEq + ###woYyB8LeDtpkUUWohCMXzAfKZ+EANAw0a91E9PXLDaZCClufYAxfwoRkxdRAHieNTD + ###mEVFcFOOvUmxArxln5EkoHnKJNtlBcRG9f3jI+YlVejyoaogqNndeXGeMVJRU0u4VD + ###cmYwRJN5TzSztPj5fbzMHhq+6h9Z/BQof6j4yatr8dOTAumrznvE//2jcxfOnsc/RF + ###Op/J9OOpHF1qP6yM//Wa+v1pad/J9ry6trs/yf3+OZ5f+c5f+c5f+c5f+c5f+c5f/8 + ###F8j/iTLta8xGCUg4PHqFCUBV9kvgGp2YZ8n05/fkWdF/nKVw8/c3S+GmnzyN7Z8lhd + ###vc390+QfBqR73+LfeQoxCZNcSs+LuOf790TzOT8S18jzudCs2EqIB/ivJzAsjdcacD + ###+zNIHWK0zZ/Pg9votjW4LwGRVriFoLqdnFA6HbyBjgee/U7JpLMyK79M127o2riIK1 + ###PVtvt9hrEkLZx/fFhzHJBnsBymak6iy4wEamRIIrNdu23ee6eTYVgvMrGQQK+aDca2 + ###JFC0VujuC111r7GPL1XZen7ZuiyrSATL4sD3j94tN4L6WgnKbG4ypJ0mbHUHZzw/7z + + + +Valin, et al. Expires February 17, 2012 [Page 183] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###keCgBfhDELd4eybEgSmGjoovn66PAyuDh7e7pfojfNk7fHu7slvcYRZFbNHo5Bwaxc + ###wdjfZmf1KTur53RWz+msg/kJe9BR7SX8s5mPDiiysABz/3flEqZnbmHLwNJLq0DdKl + ###C3C8CiFMM8pmHyAe7s76vfSOU9GN6C+GsBL4NV1A8aXR1H9RwGZfKaN/W66b6me2qe + ###HO+83y1ZvZZMTlHGpaAa38DGiXno4Ro9UVcbLL8rqp7TnzUYGo3GnDMquysDUuiypN + ###dombrfuURqT1MRwbOh2cJXZyFu2YTsrr0tm/QcWppEREBnJp9Jk9WMKP5ERJHJwfxE + ###ksmD0kQjNxAp4sL20EUJllspZF5qMS6XU02mIChroBD+W9LYNSdTMyMUDpxa1cm1zO + ###KZ2EaAyi+nmyECR83F139sM7jf/ounuaAqLd48SR/59t/aem255th/V2uNlZn993s8 + ###M/vvzP47s//O7L8z++/M/vsvYP/tkVND8+j45+Dyr+cH+weHwetg7j/gbdyL0h8MCz + ###AJSigXJWQClm2hXAhDDfbP3gK5BbCS9gArZ6fB4fHZzmVTNT2hHEmftbThebPT7Yej + ###xZtt7JDxttolFgSvTt/uBQErG0WTURtkVSormzE6jzGV+2hIt0kxjBH+PaJxTB4DM9 + ###ohgIRc3h9fdSPP5+Bk5xfG9neP8Q+Appv4SvFG6M/MNg6PL0UbEjHcLeX90elyw64F + ###xBzs7TQPjmDNnjaPLo/Iyn8CPOagdFdh92WGd9Xi1u2A//TBNbkNaKIVJpHZihfXay + ###t8AKyktIi1lXLtbv3Qfo6P0aq7tMRY4//WlkGvqftagiWWammjZj+qpSq25Lay3BDw + ###aBBY5sPBWa4jOKAHsUZ9ZX1lY3ltZd3XrAMc6GMauLLbbpXaxWcL/pbtbrjt1tcscL + ###NB1eDWVyW4y431tRSk2KIDKah1HNK0YZ1DWl+VkGKTKSA3BIwEZD6IEsh1ghGBrDdS + ###IG4ICA0QNwhCr+Gfg7jOJIj1xoZNhWNj2mt3h2rWoSJMQkNga6XxfOX52nrj+aq3Mg + ###JUu5M0lioi54m3rwAD1K2J9tdWV5fTTcvZ4E2nPm+o2ddzzxG4IZptrKYblfjDRm1U + ###XF68PZDt2AvscOe4KT/V6GQvTEAr4fIubBrIH0uC7wq2w549Yz+Yr2BnNF6VJHMuW2 + ###9Pz4KdJuz7l80yMA1mbB+8Q3jHFCtvDUftq2tg5WLo84zXPSiRo/p/MJNp8fol2Nb3 + ###kVACWZReQFnOoDzczqw48+3713z89h8jAMIjff/wmWD/WV1v1F37z8ra+sz+8z2emf + ###1nZv+Z2X9m9p+Z/Wdm//kXsP88mf/fHxZt6ntGmvqOUaa+Z4Spp4wulXaCiw0PN45S + ###nIf7l/64dvPo2Rl10TQnTt71C1Bznym0VLf5hw8G+PPM+Myjqi2hx4Xh+BHzo/mYba + ###bK4tsF0KStE3qCFeoYcC0s6ANyoj4GUx3Tz4/KdYJ7PmnnhRJvidw92DO2zn3WePCr + ###t7ApoIIf7OC+cfl2/4CO3Mu2fxISntGNAb3xdYGJjqAP7GkefqdwUqVPH72jkGf9E0 + ###ax+shRyG6yR+HpdIU6nTAsw+sBnRGmVdz9+l84HIb3wO/uwqvk8QrgJP1vZbXh3v+q + ###Lc/uf32XZ6b/zfS/mf430/9m+t9M/5vpf/n6XzO+Ph/2W8Hh0S9SDZTxRfkmMRSB0Z + ###ErgfAU345vgccm/a4MYoxcCj9a+QGM8Img64komXhCZkphRkh2qX2d2D1EMucTVHjB + ###eEKRLIVI65Tzn51AK77g/iAqd6OeL572hPDSUMuvYukQJBYq0q27Cha0DeNDpabC4g + ###rrfu6Kv3ttLgTHnRJ1uwWvQTzmUwIqEFeuoBiUx+8gPfMKvDlT/gdgPlBJ0Hv139bd + ###jFi10kA1apsrWdWqpUtx4NIt63Z1qwp0qLNNMJktaTjh+0vrNR9RrF9+FbqAdOPe76 + ###NkIRFBB9kVFoJ4MII9DYQx/NiJ8SId5rIQRNinXbMbhbRlwv541Y1uQSbAHZzxaIwS + ###YoQLxl+vrS+vra81Np4j5HhaK5Pa/F+DmZ8VoByiknPkLx2rGZ5XGijArozJ2KTZtT + ###EkG6ymJ83bpFnHM9EmMqdXrP5BHr/+ZyWnerQCOCH+R2O1nor/UVuZ+X9/l2em/830 + ###v5n+N9P/ZvrfTP+b6X/Fz/9miT9niT+/SeLP9IEiQ0W33TfiObxMFzESO6YibEADQf + ###LbEOF9mUY0IbUWjKLbAR+RM5ysKpi4snhh2YGvioqAIRxSGSf36jYPKx3IPNnBmw3U + ###NBmqfi+nqbQJWjje7Dg8+gUXfvOyxOqLNXWpWmjKWXxDzOZe2G2NKZrG7Vie9quvE+ + ###qK2UE/7dpirYZ+/vhvfZWOcAHuFNgvZdvGxLpX4p0hYYuN1QrI3ngn3f1apQ7hK12R + ###z0FWWdtRZKneVQDydGeIRhX7uBjGdjLujuJB9x4TXdcXV8nroV5jt4kIBJyYrgbp0W + ###D4AHnuaWUntX7U9YXr1MSbbW5nEIdZxkMNiJsVgTozhoqecyMRqxqQmb4zEN+Cbjjs + ###x2FJr5EKM3I+SYwKrwlYBmd0lmv0yaMt2x12+mbqcZEdSsFh8Qa8t666AZnX+NTmtW + ###AS6VD+mVFQuKws8nRRWIPz+gbbxGNoTRJ2Xw4paHRxI6cDsJkQldQIcqq4CbsdKyCD + ###MIDKuiWXQ1UcHmwi2LLtTBzc5PlIDcyAOTVD3kEnqbHlU4xilBXPuItB66MgUrSUXo + ###S7MuWS8E+B2i484T5UkJviyM0mrjKPoKHtbWmfFe+I4aMTWYLZ21JsOHXoACKSz9gF + ###RUiS1D5FnzQqyrbd1dp67I43t/w2zQJVt7dsFxLLmAu6UslIAl52mJBMDe5Hu0gB5+ + ###NF2vNKMy0fx9ZV6OVJE4jYyO/s9mvkYhYjujxzBuCGGvnNSn+XsCv0scMIeud7thTp + ###cuDGTsmRUCk8yxSc9xHMrWLA/Y/N5sQ0TEL7BNTXFOqnYV4p8zwBNLhPQ4GINZBKjC + ###yJ0E6VwrIZV80DpI9kMsDMj9/2DxsHJiP+d3yNUclWn+Dyz79N9P9aq6f8v1bw88z+ + ###/x2emf1/Zv+f2f9n9v+Z/X9m/5/Z/x37P967HwBzuKOUVxj68BbN+B3p9MUbneQj1g + + + +Valin, et al. Expires February 17, 2012 [Page 184] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###FO0Rt1SrAX/vT/gG/9VGHD/rjXLtVrjRV07f9QZ4tLrFRnCyy6G5SqpfqL1XIZdeOP + ###5ORvf6zRR3jIRIgmfmBGKQcskuCO314GSbc/iECWq31ga6QUcwG7sbwO7a8uV9g6/G + ###8ZTWygJ6zPfX2ZCzKF1gCYs4AqBtOgn3BTswlRfW15Y6UCgD1fRUvcxsYa9L5cb2A0 + ###6OVGfX0D/1ld2XgYiFNC2IuuMyHc2EBULT+vrSEGV+HN6sZzgLj+HEFzUiFLSVqrDb + ###BRBm9WWcrQTx5sShXlhVwvJzQlR9chBZznjnOm1YaqbLEq/WG7lfFv21swnnm23Mhw + ###nUKri6F8deOB2b7Xf4qOwnpRaNoncWnAdtzFW1LjAb/zZt83k25rplGGQKSbNi89oJ + ###U8c8O9taqWWcpH98KVj+PgGavd1Q+15sa1tywF9LyfxBnYLo5VokgTs60/KWbVuuSY + ###XXgyzP7z+s/9oz8Z8V/pmmpwjQfe3z7+R72x6sb/WFtuzPT/7/HM9P+Z/j/T/2f6/0 + ###z/n+n/M/0/3/+PS0Uy/KubHje6A+7WYz/u/QianWwhFe+BGkK5Koj39g8/sGV0pDsN + ###jgExx83gzasdwOYS20CtE5pRGgGIRuTaVkfVE58V/pvhyRo9y+Jf8Z3Vxb+1ua8Vo5 + ###1VXo/Ufyz1nJevL4t66zX+b0O2t5LRDu+3scrrNRprvB3xnq2J/ut1By5oh9RkP2Yo + ###F42JH3QW2z84vtwJEDU86gKofCfwd+q1DLJgQMlH01gR0C6L0dfE6NYFdKIcWxFQLm + ###/oI9ZlMaJlUWdZ1Gk8F/9uiH/Xxb9r4l/jmFbMnsJqQ/TTkG2J/uuizbpos76u26iv + ###2TNelxQg2pSUITFeF22y58ZxsWiXCViZaJNJKpKznaYm3UaN5i8vQfQfLdTOnsJPxv + ###lvfzh6mrNffCbc/1peX0md/y6vrs70v+/xzPS/mf430/9m+t9M/5vpfzP9L33+e9QT + ###0eAZykSs1AmBK6IDYtgdRmH7Hv697WNUQ/gKjINCdiTlF4wu82DS2gg+YsYIeHVW6u + ###E9H6rdUw2YNZnx8Prv+0PVANT/v0ZZ1o/RVzOJulkt8PoPf3j95k0EG3ZyA13goNjN + ###aDR4sbQU9Ra/xJ/iAWw54WJ/eL2Ev5aoMAmPvP6kw3F9KS6WaKba8LMFyElghymlLz + ###MpAMN0qMilM4DybU9gZIk1+R/e8CJ5OZPn4/ad2TreaqPx89iQjoev6C7qRrfijlte + ###GMrjdDTNI2r7HW81O1OzBbe37Z+dsqptndy51R8OoSNNNwM648T9PSviCjx04clz74 + ###zR7bRf9fWVZtiJRvesdRO1PimHYdPj/efMSzrHeV+2oKJxS+Y97LsRXnAcjlS81RgX + ###hTE9ZopK407Bz+nbAzDb8s5AbN0zwgEhOYsW1Qxf3ctoO5pUGQ/L6PZaz+yVhwTaYi + ###H17VyC+BVhoSg1DH9s83A2dGmH19vEer9SuBL2qxN5Bh/6yk0ijHcCheUpNK3suCPD + ###ErlHyIiOX5U9RfwUlVVVEYN0yTns9fTNicecuFS3bpcGoLyG1ZuenaMOrJcEQy4BSz + ###xWUXhBYAuTTyjJ9YcVToy0UocRXuLFyeIlK/oKHwN5kfV7uC4GwP/Z3vlbLi4m42Gk + ###lYCfheu50ZNYUamZ/5nP/HHxmacgN3p2fyb3n4+pqVUE8jMPQPQwAnkkkTyCUGxieR + ###jBTE80ulfyR8jcfNqRXNHcy9/egqwrwVlbUMEd6EFbUMEd6EFbUMEd6EFbUMEdyHsJ + ###mm8x1iuxIf2rbjuaSL/ztrP98G3nwZvObMv5HlvO9uO3nEnE8SgCeTCR2ITyMGKZnm + ###B0r/nbjRYggxC0Jz7J32vn8e8OTtkH7A6+MBYZKsSU6oPm1k8soE+xZp5cQNfLIHsJ + ###eFmdol0/5U6+lug//zkJW8P+fnQ1vn6KFPD55z8r6/U19/xndaU2i//+XZ7Z+c/s/G + ###d2/jM7/5md/8zOf/4Fzn9k/vdXOEkYAGrn/CjYP9h9+8rJA+8vMLe0hGyWl7pFIUld + ###BhQhdtALsJfgjSGVRxg54/u4t9zg7TDYqaJFbGkn0VcJW2HvpxGxqZ7IGCzYcCfuRu + ###Lrl/7wE+9FHKQgfCSq7fXHmPmdp3OvoRAq8xOXeM7isv2OALHyE7MSCtknO3sXZ8He + ###2dvTyzI0RrBIAXxnf7++Jm/Oxb0uosBQTVQRI702AyXF+HVV/rur0MB2KAR5+AvFYJ + ###Brr9KGGPqo44U1dy6hH2z9ipWF3UbctaIGv3pgX25kwL7c0EWMJOYm7PDLhR1ePRh2 + ###6Gc62NdWMmBfW9FFjOzwJuzwy4UdXj0YduhnCtiB902iGSrySJqpToAd+pieZqDSJJ + ###qhIo+kmYKwT0czUGkSzVCRR9JMQdgL0oy1uicyGjmhJuWgi6xJOxShx0M/iQQjwWh5 + ###+lOZgObtap7AjBkul6CTMugX0HZZX3W0x5+o8fOmSiYFlKEBSvhmvrsyYwkp7CQZ2C + ###nAygTJmKSJHt4mccJgPORpoQaeEjwh7h8AMlYp0zXPDXF1r8zTbPyFFXj+1zJ+qHaf + ###+dv9gbcr4qjB3nkCYsYLRnUWRI0XOc3+nguu0ezOL26zE+eUaMJcGWWobs0pvruiC8 + ###FF57QAi5dLyVyzayv2qsWOmWfleqd1bYVPK/xr40k+x8dFJ9gzC9j6s0mt29O8tqKm + ###GWotiLpZ04wd/F4QfKMDMeFGB0Z4S0QQwARfcUM0sIkPiGx7wqwfgjQWsSSEWaVIj8 + ###LMIM3yIAUOo1thjFP1TYqyaEpDRubDEvW/vS3yO5YIEPFzm5WcKvBhmREvYr//njKY + ###E7Y8fQGaJ/a1afcFVYy+svK0AJKaHC0o1mJymV6E8a7D4b0XEQI0A+PyJCx/3ag9fa + ###J48T12Ci4JfIOdovqwnUJJDRMFGMnQ8reKFHa8m4Viv9VH7hXycVc9U3sGdfB/Zut2 + ###XxlbR3Xy1uE0ShVYXut6B6k+bgepPmwHUVLWRIHvW+wg1SfZP6YgALGvULf/5+8zC5 + ###aMjaY6eaPJ7IiqsmI96p2nqnce39ZTnW0933nrqU6z9Zy8Pc5nq1DgAaL36GV61cF/ + ###X+K43mOmNjzFRF+Bm/4Xhv+7DXv37CoeJZwq0Erdi6J21DaVtGXMWA09Ki4C7RpbGZ + + + +Valin, et al. Expires February 17, 2012 [Page 185] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###AhL2K+UcUNbJnfhYrHGyvryDZLnEb74xEGy+l/joadbv/LBJUPkEU3QH0oHVs4pZ8l + ###84PG7NiL2rGDWy9OUoMcW6O03pm4GitkPQQFJgaOdybQ0/HOBHqyfrdy6UvjYIF29n + ###ksX2S6XZpZcGnGoaKWRMwD6eJ4J5MuLNQUIwv7Rasonfx5cSRgwfBM73cniHlU5uEs + ###iaMDRRziz2tlcxQo6pqS8ZWwFpA0RRsjboaH8EysVhbNF8J0DguTUJiteVefwiHGiJ + ###+EQ4oj/8TL0LAyUXPGbPH2WqYMaGCkaEWf6Tmv/EQLHVW6LEBvl09Mb1f6VzZ16UKP + ###paWsljK5OBHIRMRgmW/Dy0smhmAALWMAhLArH8KsYuLfBzK6kofVZbaeT2BZ8pVUZb + ###CIZbtOazFe+zVIU5YYhKLfPJbWFiCUA3/YcuIumlIj1kEE8DaWqC9HJMV2wkntXDnt + ###hGY7Do4QwK90+tjrc984dL7gwh75gOtAfR7WtluAte0+OWtztj/vNpGzH9DO+NQ7rt + ###WuQ4IFkHvpQ26BJb/7zZZ8/m5qLcAnQ6axph+IyEsfIi8LIPLyWyEyi3U+EGmZnLjI + ###2R1unu8LbLDvH7LBVtjodlCn/zYy9E19xmdkL0c5gfogoxSviS1ZoUaDi7O3p/tCoE + ###BDpSrXEOVQM+btUOWyJ/mbiU5e00YxS+urdmMCLGuibVFLo8Bnqsso6JGkrM9ljTja + ###WzRa0OSmty0DjSaSslDg6NpzRQgIhIyJBIRlnmIx0fg15k2SeW+KlnlSL9bz2ky9nh + ###OqRso0qvjPrchJVw1brfGtyNqHjjLSVIL+i0rJkh6hYZs7OrJSHKF7oXDhIU/KNjpD + ###k+tO2UE3aqD9z53uF+U+ZL0tyekmPFCeR32iWpK7IH4quy3zfdnTuPkhv/2s/YEbqn + ###M34ByYLrNgunwimKhvyTO9e0UGBJeFIDCUwyK9vc+ag/eF5iDV3wSMm5UKq8+yrhiF + ###dxhZSHtfCGm5WMuF2S4p8VxATjieWOZ4p1AZkIBzSmlnur3j/6mvFS663LAUl/2jd5 + ###PO26hIsW3bUhXgC9clLIaHG+ESt2N+TUMSZB6NmsAEhvPVg+Fxv2UlwHPLbVvljk5z + ###xzdhmncuNyYXyZ9ceTY3ocz5WbNQOdyzRNlJoBlFJ4JolJ0GhLUVhyXwpI4bGTSyYZ + ###Yp6be2h1uCV5UcsWAjJWKzzU1eMkUF9JauTqUphH/bZBsPMOGUVZcFrH98kJMcCWSp + ###DFfFDGRId8Unw8aDLFoPQMckTiZLZXs/+tDh0b8eh46iRoLHomPS4bosleFQaSFjyi + ###ECxDZXNDCWkv05HGKfLzCBYuMvNIkZcDPjWZpX3Ih4kJKwxX3EKYZQ4EjQKGkf/+TT + ###YcZhz8MI8bHE5gz+ogBTvpiCKftGUYTZqokCaU1NlA/USWzzYiq2OS24rlV+MryT+N + ###rFVHxtWnhd2+NkeCcxnot8xgO/HgHvFltbzgPYC3GRlXsx9cqdGvJ8VKfvWAhuMtmz + ###WiTDzqSPq6l2wek2AxhWvWxzLbQ2uixmCntl+uDGYFhpjsWcB8RPDXaKhDW6irisTx + ###YpZqj1oLbIenNKe9fcuBCO3c1zaiQ3/sGQfFGQLVz8CdmC5HhPg1bV2hRoZdu5aC3C + ###FibvyDPUelBblC1M2or/SLbwJ0UyelIX29bMkn8a+q0+kuNWvyHHRYQVYw1myT8Xah + ###9BtR7UPoJq/eI5ndEWUYLEae6DDTxpbJrmgqV5OnO7DYetPr+ZHhsX4W/CXrsbAUZ5 + ###zX6H/S0a9j3xoHyaFUwFfw34rbO/sBLJ/nU6pAjZM/zrBZ5s4FvRQBVe4vc6P5+YXs + ###23TrbgRR3XhNl42aWLAnYAPgPFVEBZNkMRzJgvea33u8+XadV6qvlKnwNTx1cJixMe + ###/gXg7XT74ShhYTfpV1gCQ+lHiQyusLiIcRnsmYDq8C53uUARa5UAjqFve9whHZjoK0 + ###QvRREBM/ozlimyWZkRBnDIVfjHsa8tsV2MBjGMOuNuRQ2PN5KwL8N+75p9uYl6Il9t + ###9NsYw+2M+vKc5Zdf8JwF+k5RHLTDCSKf2FQxi87SSroz3poe9x836qwxT9pqVDF3li + ###fOsTFWJJKw7Fnqe68P9n4ODo8mWP10Mfv+Fpt0/KLthOWwkKtJaB/DcT+MXMgnGQGN + ###gvnAp49LzDPubwX+pPk3CuaDn7Yqm+f1jwbfOeuTh3ynnP/jBZnlRpA+E/SUq68FE8 + ###8Zb+PepBLh3YQSSXzdm5PpFGbJwf6EDxFgKv7j6XHzEONgY6Sib53/uV5fX15LxX9c + ###XpnFf/wezyz+4yz+4yz+4yz+4yz+4yz+479A/MdH5X/GOP6Ut2ppnp0Pgdu2RhjosY + ###36Zm8U/y3i+ThQeMK9LW6TGgo969jvJFjJb4GoWXINeZbyO8/O8N8Loe1e7IsQ38Bv + ###3yzXvHWsuPWGbiWfu+BNvfbhY8VT1erzjF9G/iACp3/Mg9MbUH5DfxfZMjJ7xSDz+O + ###8bjstQRM7kKTYyIEj3ObY6HcAkBa1+1AnebPg6ln3uhq1PwOTbVCGmQPJYy9tvXuB8 + ###fGhGg2QUDUD7+VsEmF6r+Pq0xonFGRafArfGfHIgsx/Zp07Bwg0lIqFEVp++IP4Yrh + ###+2QSSgCscv/CWuf4j3lPKEXqgQ+wRglQLtb/OEKE48fNmSdW9G35rZ3S3pXk2TgDXD + ###lEqlXGEbUoU2gRItC+8NRY5Yp8LqNbMKXt+U1badG5z2OMVBBJk1JHjNo2M0FvyCLK + ###YJPdGSpwTlPMt7sLP/37xHs0/j5qhsfnNi1zze6qO7zsKVuPKuJseYeQ+Vm01yBiNS + ###24hK/CvlwpjL0joo5SDxT5HPgeugQ56MMKuOw155nVI+CyQSH3AEyYzqxnIh9ieWKM + ###iDJkgf2PH5XnB2AeKV4AtedrthNcnmsYkjTnROVidamnsA8lW//4kNQpCIPV2JbCUW + ###K9Bj3tuFyRiCDEvDSsQ7G4RUV32uImU9WRwAH5GuKMVzOanAUmQnO78EBqJeunY+/k + ###StIL77gH8VKw9bJyetguXfB6PbQfDm/Yf88ssNu/zzCpOkEdD1No1zY8jzA0C7yDii + ###05HsE/mJlD3JKLxW2TiM4rAsnqlpqm7v7db5PCLqDEr5ACzgI5tnRlGxITkMVuSYcs + + + +Valin, et al. Expires February 17, 2012 [Page 186] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###ulU5ookper02SKVoy8sgGuYJPr+n66HO3b3gA2T1CqRkNQI9kovOpGattGfVFvqSgb + ###tcbDIQ4fBmxny9GkPKYWS5w05B6zUdFjq6QxZGSDuRxGXVBdLaks1UdaAhOEVWHPrM + ###brOOw0CNVtqtYE/tdUm3xqkgyo3kfc5IGKJVkDaAHaCcM0eO/eBF94haAbDvtxWFKE + ###XGEG08rrcWcw6N7LJLEsAXiHUXXY76NpQzRO8xO2SSsWcWcycpdNpiu5cPAsj1K9vr + ###m4DHbOQZH5pZRBY3grVK9Pvg9vsCpfee+DN/YuZa5H+wqpTdL8fEjdbcrpW/ES3vUK + ###ig5qGFbfqUVjiiDUAap/JQvGCgNiWm6sr3kWDW0nwBqu4q6UAFM0ID9HpYwZb0fdUX + ###gS97JJYVLuH3z89t+kFXajAA1DAafR+toj7MD59t/aysr6umP/XW+srM7sv9/jmdl/ + ###Z/bfmf13Zv+d2X9n9t+Z/Tff/itu/6OFRZqBcdcjtigjjrBQSvVX+DfpjKAp2FZgj3 + ###iVl+qzHY7CAHhPJdsKyMvEvYpfrcXnOiRZcc1nf4WRlI7KL0QpMi1Tw3nGTuyxmWGy + ###1O3ZyUK9JoU4pYuD+IyX/r2qiOw2rYJQLSdkkR60QJAwEmrZXiI3S7S3fJd4F2Vtyv + ###qjxbdHP375P0TlMUjiXhTANt/uf3mUF8gk/4+V9RVX/q83ajP5/3s8M/l/Jv/P5P+Z + ###/D+T/2fy/0z+n1r+51Z2FJQYF5SQw6DXc9gVesCiTz5OP/zo871oA/hc8qJYxbzm4K + ###mz6rYFH51A1BDMQbzUmNSO21zD2xy1RC1O09zB5wj2Jr41JOHtAA+OcNvpReGQji5g + ###txj0MXYjMHs8PALWixJERnMCd0LhoN0OuP5VNPoSAX/GsCOwe4FcyUo4q2V++CH1Nt + ###pfVhZlc9jeSTjqhld868be6WjrBUr++OvTVn3txfP5lRf1tYXGPPwBIMKO0Bt1Sj+x + ###/7e+2K78VGHVYX/ca5fWVleX1+YBOYtLrPTpxcqLTwsb8ytlvOWi6vxv7yf4CXQ3B9 + ###2L2wiGjtcZRr8FBAFqMx9YY52UFVJ+6o06ylnwPN+ordAfG41lfqa9Xq/V6I+1xvJz + ###+mN1dY1/Wq01GvTHyuo6f7PSqDW4Arm8scFfLa/VeaHlZVFoub62Tn80nm/wzhobDd + ###5HY21dvFld4bUaKw3RYmO5vsxfNeqiUL0h3tSWN+iP+vM1Po76xsZz8YeAsb6+VhN/ + ###IIxfQTnU6nRKW8lRpq1ncIcVHM8gefp/3icKRLrmrUZtubJ9FIj/ZDroGD16/JDkwb + ###zRI/fPyeouq0dfQYA9QH7idUJqRt0I5Z5QcS+UsPxP4R5tld/p0VqlFXv5eXr0OCB8 + ###gpXGVfoW/pMyHjRr/Guzzj+nLt1IjPDrhr//br1omGeoxzYviTGKzDDsXUec7cEEw1 + ###QhS/HwEs/dR4mZ7S2s+uyZ/L25RY34AgHLIs8o+dGWiLko4TsErjCOeq172dknNGCo + ###brZxNKzKVtINfyI/LIThE3bfUN47hFrTDFJ2Wc8ndD5QEIRk6yLZms73+7Q5wIoc9u + ###/iW+tssyWaNu0zYiarHdODyASUVwJgq3iWumGOnm6ghnhEimepI+VmgT5U9hxbmbTm + ###sfRwJDdCw3mHU452XxPF7cGgnhH3Sp2yVbMuavJxLFhObJLWl7MTV1kw1b0wlRhdKb + ###b9rHzQwRRkQWe04cDY4vNQT32QwK94XD+SKCEFbBi1xkPKeY7eFAgHyi6Ipd48QIKL + ###al6BRe9LvWq9jN+q8meDfjLFZqD9FSEVAHsaweoagZZp+Sd84kZBIGABJf69sMXszG + ###mCxyPZ0m9PGkdBi5bjYU1OZF1hpoLcm9oxXQNU89xBK6d50RJvBEpb7ah59lXhi0BO + ###jfRmMEADPCqI6xmN3gKiFXM0KUEuKXc4jfzhFMQWtJOJsOX8Hmo2wpZtzCuq9tXJwF + ###jNwlhd7x+pBjm26l5s8WXwT2D8/bcs++9o3It718EgHIa3EYgkyeLNI/qYYP8F8bOR + ###tv/O/D++yzOz/87svzP778z+O7P/zuy//wL2X54iAa/JXL49BeADIMGdkwNAbBNtwT + ###IxRlYBaUIOgtagO07wf3PRHXC1Hvtx78e5vyvLMb8HAIyHtBbUjK/iEd/v+jF5fMu+ + ###do8uYfUBPZwdXQT7B3s7fw0ugfSDkybzPqu1mv/+DBlBz+NR64ZFyQgVwn7mvRlu4T + ###yOPkddZJy9fgwMsdPtCy/9LzfAYXsUOyTuokXq+HwPWHnYvU9i2lcG1I16YwznEBZY + ###cH50ufc6eP8alkRwegYTHRwiwQHdpoZTj6rLHF+7sFd8iduwH0R3g7CHrNQPTNH+d2 + ###FNvD+6fB0Ag9s5bfp6Z6y2+Px5J+tCEqH0mAzS8h6DsGdklacKJrI4WMkL2Hmvx91w + ###KP29SaDxjNgdCl5ZgQW7Hxzu7PkJQj2NxdWoutrx1H99dHE+obJAxfPnmQ0Eh0cXzU + ###ucyZODzAbW+FweX56nUJAe2uV50aHVrYFhReAO58h8ijy1xVrdrt08OQNGVqx+bbGu + ###B/WbdWszGo2ALq2RnbylcfFLd6e7BVqvLXf8tU8K1W6sZlR/X6x6JvEL8n8NkiEbhE + ###kilh8uxNzbeFipedsHkQ+LahWSFjPmAgAWiUyHr+GOMmFyw6pgXc5SeAd7DW7nwWuc + ###O1jSe2cHh/UJc5ZbOefkC8ll1V8dL5HtHxxf7sAyOHiTVX2F08tJzJf5bXjHWuNRtd + ###/pGMMVd29L1WXW3mUDNP0n5awxnxydBnsg2hweBq//JwPstVomyJOq1t09hWb+HXCr + ###/jhxZ5vP8LudfRC+YUe76XfbJtggSh0A80V2/w6282D/8pfg8jVscdnYXuX4ag6iCC + ###hiB2/Vx6N7drx7cQHEQjfKvF1hgcDtL6ev2uJyDrXLHTQChW0wGoddk3ZzKF5iBPaH + ###cUvcWkeFD6m/eXrB2mNaM0j5CR9hKEdoigGvAiiMAsBF0J68coHZ1zjWOqG6XEcQYF + ###8Wl+Kbu4ACpI8WnmNxQIz+X+9cnBAEIPgVgWDa/vH7uKe6D+lSGh1vJTb17FyAuFAY + ###EAWGJhB+UowdwKaTgG4eJuOh1HVBmIBxgxaI5gWYEhAnLGBhjQJXl9hSAKcgRIGckx + + + +Valin, et al. Expires February 17, 2012 [Page 187] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###oqWsEb4LewwpoHlx6iWxf0DWrkQBgPRsN+12wUhGPczTA22+UR6lIX+cMWLIrwPww5 + ###1YXtNldw+c3TELTfVn84jLp8ZDxohDmQ1zvnB8WENHr4HjxHKV5wRpObcGBIZa2beD + ###iQ1GASNklh+xPEMHNoz0U3IEh3oiEwS32Kb3bCNxQlZSCnTe57o5sIf/lApHMEXIYo + ###iocjWyI5PnsfXIAmHnjg5Sw/PQMcTJD/hyG7CYe3/V7cYlf9foJSASuJ01sBRLlQ77 + ###gMz06P9oLds7Nmmph079N2jrhCpNxbR8spII5Oz99eogCBqtgEaBQQqnsb6w53oYaQ + ###6AqIXZJTu+NzphXGdIPiiUKpM0gTgqNXrzmKzy4CHGlqjDZotUUuGelNgDMW0TUHZN + ###THqCEJAYEFxOYe25MLmzBfXyh3TBo573p1ct+gu/XYbX+YC0Uhrj8FfDAvXtDIAwN7 + ###CgmKKsmLI1h10v5q+TMYAHB6uzw6zqZ1B4CaFwBBJ5P7hkVIJJNagppAisGkqN8GRO + ###2BfJaE5Zg8nbrkLuUlESRIlCiLro8Vue11cYvTkofS5fP6JVoSy5/sr1gAJRXBoHJg + ###lIvGhZfklhSCxEwl46sOooglSivAiC2dGHrojQic17DAd5F3VejPJlB69CqMexV2iR + ###NZ4jt1dZsTvGrHkpebb3cPL7SAX4CUVpwJFKoqAojIu1gCEXcYtiMU3IXNXgYOYFZw + ###AYWinZPd/Z0sSSD91JHJOJW1PDuhcrXmqQ071c5fD/ZxPo5w68qSurF2bTVV3WL/Ez + ###qvp2rvnaHBsEB1L+hcay2Au9riRkdcvrodRL1EhoqS2wBrhd3WuCtOe5C86jV2m1Dy + ###ZouiLw723+7Bjn90Seu+XgtOmsHueSbOGg2uJ7GT8C6+Hd9y495V1EGiDOWRSGjYdQ + ###CeXhK72iyqZFrMaL4naxXNnN/qt1rDfj2mx6/aU5X+xUjZmbZL//mf//wXz6soeG/y + ###BOFfJ53/LtdWaqn4r+uN2fnv93hm57+z89/Z+e/s/Hd2/js7//0XOP99ovivS0rp+P + ###k8AFUJPg0we4nziPQmNfYXVmcvWK3s1GxHBWtW62XSpDD3DcmYePkBOHynSp7PFFHO + ###VIVyoYLWLe9NKFJh9VXylqyz8lwxCGUrx2YrwrMSW6EbPr0WydwkSSKHju5aYhu2Ay + ###JEPS1x8ssb0C+89Mvh84PkAg+LoPm8ELZHS2eMdASQMxKMJRmOQsajJKJB2NPuhBC2 + ###+AzG3SQniq3qW5XNu8SR7jvvXoXyxc57ZN/iDoAK9Vqg79ybHXwUl+5FEm/fTT7inL + ###sk0/VNuvYZWeYzAfCG1RXW/CxACo17fBuIOSe97XQ3aL4+OD4Odo/P9n5uklO5Gjeo + ###hIDw8Crpd8coVlA9FA3YVbff+uT0nR1cs8J+rbBBRojNuNXufEDn7FRUSl5o/rdgMB + ###pmhazE2vz7nG6MO66LWw9UHX5y6Pm72HCzxli8axU3HXJ6kkyKqWvHaQkARsDkwVCg + ###XBDv7R9SBA5eSFDvlucqArp00wTsne0f7HF3hOD44PTV5eulRgX201eNIKuAuuTixB + ###SR1wdSwTIxmqFBAAo+GkinBAV88YE5UmuEVDncD9qrfIAcssKQ4RrNKbh+5XD9CnBl + ###jQO+OpCaQP3G+/sV+v9hywOefDiLDRBCAMpgqeb2YbQG/B3LOvGV5fN1zv9L/8UJa2 + ###Ere1g6QrCKo1pg8+Dxfp3NA176xqw3D2j+W2weuQy86OaBfc82j9nm8c03j1Tt2eYx + ###2zzk5uGDTj548XA0Cls3NFOke8QdVssqq2xIsLJjvNOnLURW8HQbFs7G7Q2K2Lbahs + ###SN2Awg8THGs8Wq+ld6A8MHDeowW1nDcEAn4xXpZBU85BoJTwx1q1lYI7OGaIA2v2Vp + ###W0VGDtQo1NT0IPy/HrQT/9H26dnzbZ+s+M834+HaylMc/vzbxPjPa+v1unP+s7K2Nj + ###v/+S7P7Pxndv4zO/+Znf/Mzn9m5z+z85+p4781uWcabBGwVaHQVCpXGDAe7qgWtlpj + ###9EiaEAOOXzygcCqoIx9jG+HnMO7S1QfkosPbz6noSFlNGaGQTFkuJ8kgRryiaHMyx6 + ###Dycot60fD6Pqsn/McbapoNKf5G2tBl9NTByFO4RRi+gAn7QMlLPorw01ZPtqVF9tfK + ###sKahWYV62tM+8LL5hXpGJsPcMWUl2VM9nesbgpMS8mWHtuql4lntfeA+XWhAouRVeC + ###WPR5vxWHKwwuh2UA/eLNcq9GeD/wlTQqltlus6gtIepm0nD7m49znsxm3tN40lUAdv + ###cVvEpqtnk0Eiuk0izJ0kogdhgjga+DzlMux37Hw7ptWYJ7dnKimcN6oPbwwj2rBPjs + ###lijwLxSDuJ/MVNUS0Ro2pSy+lWASWvIhSSfMT5AmQUFFrY6EufMm+KG1woFF1TrQTU + ###fp6W0wrhpDEvkyPx7ESfw+GbEqvuqeBBNJwKjqYmRlNhUMmMz4MsJ/zMpTc7ZZPoSY + ###bossxfwcXZ29P9kgEJP/C1G347aJP3pLlgjMYJhz2Ow56anSr7BD89BiVFhXx+ejBE + ###c5gvU4UbZmE+fAM+AeOJCrMvU1cBIsjxPUHUI5051hZP39iJgm5B2CaB8doH2sbaoX + ###BGxjQ6xx8GxOrdljGm3C7qE7v4alIyXzglk0iKpnryPn79/7T5JmhHmB6t9QQ2gFz9 + ###v15vNGrLKf/P1bWZ/v89npn+P9P/Z/r/TP+f6f8z/X+m/xf0/0SfAGxJpFz+u6uBJR + ###g05U19hZ/6W4fIS8oRAK+rgWiIohYW3317KMukVboL4KNN9PT8wOTNLn5hyFP2jUiQ + ###DM/Esr/8pgpPLHvOs4CDejG5LF3g401PLJvsXDQ0svit9LxEzceHwc4FVGike42itv + ###flUS8epXG6z7OSf2WGtCuyaL+cPMdvdE5zT6PO6zvE88oUQ0kwjktyM/C2htiJ7kT0 + ###aw4+j5SroRcR5OMehtNn2leql/ymh0pZyMiBWPhNGVnFuUfuMBCRlQfJQa+15zHnkO + ###8K9/MdMiJR5n/MBLcIRaLLzsMIshyDpDsUFGFJTvNGF+npZGyQ7Efd/chrLZJdQInw + ###HjZ/qBdTLCaOGl8X3kDvvtDuZh/47xHZV9BGUJs0DK8V6g5mjdaVfxxnug+aXSFg1Z + + + +Valin, et al. 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Expires February 17, 2012 [Page 191] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###vDh/OcglWqVFTh/cL/aJeSOXHaVtzFn7WyIuDbL0TDZBYbdYi4ZkAXcTvmZ7VgW8aJ + ###VAqKUTJ7+QTUW+W3bwpScNjtagQsEytgYLTkvg1wKp4g9oYzZxTETDp7mXTm/jsJka + ###tOIvs2kT0Xkb2CRG52u+syWloZJy6RnALaQae5MOATYjhWE88qfUZBQw4UqsXDa2Re + ###wFExo26J+UlXZzzd+R3lz4PaF/TPav+/y3TyX/G47T/d6HIGmtATwci2/9Q2qlXfsP + ###/U6xuL898f8izsPwv7z8L+s7D/LOw/C/vPn8D+M0ADUNA+aP0t4Emz3wVL/wu/4Z1B + ###42dpLgo+HhzV/KTUztl50N7DEQ6OjqE4TJ4dmMKo33ppliNMtQz1ybYk37yaTLu94d + ###r1m3h3cNXD6yAgUMR9C7XoGH6TZdEtczrujL6W6e8t5VWT6LIg6GDAbPxvKbrH/Tb7 + ###685fYXsvcZsNJjz9C3q4s7fRFO0LZ9Fk2Cfpew7SvIRmmeWXwgIxhV9QvIME7QgL0G + ###14E7GEXiLSMoh9Rql6b0fQlfFPEyZeU2fwNhiSsCtJin2RRKZy8SZEEluBAMSlNxhx + ###MbNcVZTjnRX0wowG41lfXfbEngrx4lXW15MGYWSbbZil521eaEaMo8BZykOTwCfYuj + ###GVWFLU6vAz7Yu52Qxpzi1kWk0Ql8H58Q5UJYKqv/FfSoLGJU7jZYwqof60s7e8rDAW + ###LOLd4d1EcBagQXAJ7Ggcfr4NMSsA3mUq4QqNFhv2gtWfP8fLJ4Jv13G3OgJVQ9xYBO + ###riMkkMilwD6JWWOSV48VZvMLvH5fcw7Kg8/nWyjtABF4Uu+dM6RvpqNhBB8q742g7z + ###Scykgu1E92SJeMEe+vBmHv3wZpBwrZOd5fzymc10h+jyX+oN0POkzNOtlFmIGfJEyq + ###h1KEO3wsNB2P866dlB3RCb4yfB5tEPbwY10Q6msdTVUbpadRldofUkuueCtEShXG5B + ###6162mnkibEjGo9wct8MvUemvaA6BrwB9N5yGa9P76V9zots/KTqwr5r1p3xrMhje4S + ###S0McppRjHMJx3rXMNWeQWXqQCVbjRu0VpwL48LQAkXgquEOYd7eA8XF4X+kG/MJsua + ###RAOkjt4fggADVbFNVy6tZ6MqQQgHIgBB+4Fp+Hkixcva2nKZGBQ+ZAMIzptv8XJOAq + ###AGolQsk7pjU9L3gNbE8eRlbkFYBqfXQWc6josSyVxFEf8LG8FPjt8k0p9eGjqJgAH6 + ###6tu9ANXDt6DhKTAo8ZsLyEuxMokGdI2gaAMkos0WiDRKC51BSn1RMcloZxJoMrt9YE + ###3glofW7A0eWJNG3l0XGRi03yPQlV/w1XAdl/BOOIhTPQwHmGlvhNvT6ponAoZRxr6Q + ###a19cgXKoo9gessdR8xBUci0yfOrz//G4FDJgBkZn6E358cpDah/g5b6KV6iyqM0vuS + ###JQflGy6MNrF+tlWm2CD2jfFEPYWZvIVbDHZm3zNMshZ+Tplqs6IYAXuEnzL5kS5eZT + ###mf1vwhDyIqrVBD40cAXJYNe+HEdhURrqtb8Vq+SoPW9NvTaqx9hn5Nb55op8iGKuAS + ###tW3a65uppJwdTqXNwc7H7S8UnWH2d90sktloFWVJ55WQA8SnUOPEtmpFZH0f6I6iil + ###RfU4ua3dTnp1WB7mgf5wpntIzaS2a1xz+EWtfjqLxl9FNvhw0Il2hjM8fS89s9Z3II + ###Y+6t+EerBYZOZ//isWmcUC86DaiwVmscD8eRYY1zqCwQedBmV7gZGGcueu5nj+BUdH + ###Tt8T90fmQpjXy8ctX6mt0Pyer43HLmd6Kw9d1vRWCJ8HLG+uVuZf5uxWHrTc2c0QQg + ###9Z+uxm8Jln+XMjg888y6C7lcdJice0kLTymBaSVlJ1WnuCOw2uvBW78NrpLOyegAxj + ###lddOuRYXeJk0A5xSymoKU4GKZ5k9e5aCDD6ZzWASheV0IZi0Yi+fhYR5RjNyGV19nU + ###Wzl85mcB5ldsu1Yi5bzRgYJUtrEYSKY/PKtfznYxPrCcWxeZqJ4Fq6K5U5pIRjk/fo + ###NVc3I8MCjwjOhRN1bbHmOlshfBZr7mLNLdzK04gaMY8Lafb5raSsr/m0TtZc2VTe+p + ###reCj5xMznra3Yr33XNLShB9VUu7lbW+prdjIFRsuYWQciNTeb6Oh828ZpbHJunmQgG + ###IvOvu9q+l/xh8C6d6tYjvKvEinwbdsbDCQsnLLodTb8y7gWmOQVplln3Uh7/ahzm7x + ###+09kQJgZUTHcXRiDs+FfIYJz+EO8qogwE28GCTvNvQM4cuF3wu7JkjWxuOInJBFsSg + ###5gAz8tKlL9dAqMFwyr5G6AMSDagGOjPDR0JlIr3BqTi5kPSHE4wZrnlDcHDQdNxq3F + ###p8G6n/FSsBZPwVNJ6QwiPG/tG85/A6HKFfHPS1jMmvwn5cjyB3BbjYXwFvpqITaInF + ###o8O9QoOT87MyOwq2fznfazuXVE3tUe7lzalD8WYQOlu5Gj1Q1YiFNbqBCO2JJvu8mt + ###CT6ywjaOMKx6z0vwqF/3p3meegk4gSOwX70+ISXq7mIvM0Yk00w7m1VJJ8tlxmJcFp + ###eH8LOHeUiY9ohTi6lFM2q5VvJPv2pA8ed8Rtnx+fiTkBE3iKU3Jt1Lkts2dnB0cXVb + ###xu2KiuiOwgynU1wEI4xTLyINobkKMF3eWIvkTjr1NyVoSZKD34hYiCH1BggJzhEU65 + ###LqgJXQuzrMm6rMzqzHJLtouogLHTOm7vBVi5LRaOJcvFiUqm+FCZD6hN0qGFT/Tkzl + ###dANw+Dq9GFq+VPmgeUVatDhlXuzRpO8P77HaZnvaLrjDIePi0HWcScQ/Q5ZV4s8coM + ###VLIiok9rhlPkAbLPKfPmlhNPI/GUZjgN3GOVp6saeo/JIdj0p3yB+pQ6WK6sSkeU8J + ###FSZof7jvbIxwrZElZp5FR0Ey0tW27XKbMxb3g5zgljPmrnbkZFS5l+MkZaSivUEhfV + ###blrxONY5uDx+ML+pvu+3PVB00evNdN58u3eOrnT8OoKoO+Wb0VLii7fMe5K2PTWV7f + ###hKwnyq9nxS36HTPY301xT1pCuu2x/qbkNW0y+5YNU/+gbq4vkjn7T7352geXLw+NDf + ###9OTc//bxM93/rtX9xmYD7383vMbi/vePeBb3vxf3vxf3vxf3vxf3vxf3v/8E97/niv + + + +Valin, et al. Expires February 17, 2012 [Page 192] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###9nXOJGhUi9wM1/xR2jiAaYChkz6kUiYexsRGljecLDDPv3+pK4NM5EdsR/Jgf/3UhN + ###VRs/mE9uEPX5zxeYVOkYZAAZcXAiHu212jI9L1pnoqFIvujIMTtpUwE9ylvqdm6wwy + ###FPgETzVpEh4V4ufdM69zKNoho5kzu/qbSEgY+xkfvEQNQPMKy4llR4BcDjj9tf8bzA + ###iooHyzcG+sI91NFxANPx+ExE+NIrvo4TFqt9isOBQTOz8QD/vBQGCdi1QtOyXJxmTs + ###f8YNCbCsx5eETcF+MetpOVh9h49DiHhR9XjEBQtJwEwUIORl3RGBT38CWNOivLsifL + ###lTdaWTUw/ICbQAY8bZjF4fDGCA2IKEoTGBrVJLwSe2bMmEESAe5b2kBx+rOQ8Sy61h + ###jx9+rwZD+yyzIQ5QOHR8s2DTjsoAo07HNBsxKDEj8n6XoRlPhRSCU0kxcClTvH8ekP + ###J1MMbaB2D+/XV1+A/oZvJxhOkv/1Bf+z/b2dx8AcRHcnYecmkoCTEKFd3CBEEx6UNJ + ###5tdJH8irRJ0PhGVFWBCTISUxhnk2Q0OQsHn6NdvGLPkgzbO8PbEWxzJnjsiYbvSQ6J + ###M2ODmmVF+M7j2VTCpHChnAO7MnYgKKxR51oGNM2HqUdINcsO2jFQFWYSWVTGFO0KLF + ###L76Yg42iujSKGccVeT4Obd72XRTIAXZIPbXrfbj7hpP1XuKN1QcKVxaW2fnQWTr7eX + ###w/5Lk8wJLb1gejvCkJafeFLl/Xbwt3d/ZytWotjgsM1WsVxGYz5vDKvC2pjd1idr6T + ###xsByOeurBGCFEk3yqG/DUArgCPEcwA4y6O8P45ltClK6bf7KDUNX5nsdgtLrmpLbeQ + ###LmBRWBcF2Tlm7qaTdpyPXKLCPnIUfu0Pwy6LCxZsET1OtMmvrQPm6pGIw8obWx2xlh + ###F87PVibbCPWE/kpOPHTdC192K7SVZ53rUJ7xuJFyWip5UcElMuJmFPeXTZq3H02ywa + ###dL7KmsosAaAGYlVAjL9TYu9escMhyNzKG8aVOzYdh4MJbe25rWAK0ikKb1/woyc+1D + ###ij6Ta6BKHmKc6kIHsjucR+ZS7Pq4WWZyOiK2JgQoBJhidvvjPr8210i9eTXO2uyQkk + ###OL5sFaq6CmlKnvFWZjVfTs0G/UiGxP4XYEhXKuJYxnAmQZLrqUvN0RUzEhXc4Hbibl + ###TwWXMymWGgEcnpfG1Hc55XZbdWFt3saXUSjflsppPQQhUvA5HbnPlGOlbuupHfNc/d + ###t38zLP0fimX9gVjWH4Ol/6OwbDwGy9rTYGmDV9PsVl1Zi8XuRBzp7QQHRx+arYNdoV + ###m0D/6+l5mEOZ77pBSoFOoJocMVqDNcCN684fNi1eQdpK7S1P+8Zlvojav/5PmO3xpO + ###oj+41+0mmiGP3kL3yWi380tW73UtJ5rCWurcEJZVrNMkOYW2h5U07GMetHgh4K5Ekz + ###sZGk2SFW3P3JEGPlNZypRgLvG0wCnL/P9krPMY583xkqqj5jlJRhKaUcfaeGsuza/N + ###xQ3XaJtSzuVRzUCdinmZ3LgxVHgWVvqy71wp47UfOC1bM/lP0BDw34IDmjWeL7OVtT + ###lpBqVSdS4PWTBV46MCyxrRBcFh7sVtCrPjGu16qKuw9Snjfk/SMaugTsiM5iftXjfK + ###apYKqHHr8V9Xv+l5nUrbl86KCVFyVL4l5+AZo//G3l3ShKLAj6m1XrEtmnXWbJ9LrH + ###JRXKKquuGMLtwJ2w9KnP1W821w0tz529550DpunyMrOdg7T3lF18JM2422cRQ1hMnu + ###Q3OXXfUxbByeY6IxgL6qhZ9gi2i6aRXQIey8lvJxVIZeBNQLmfaSm6cC2L4F/eHnUU + ###m1RHnLWUugo3UykRBVijf8zUHrmLqTJyavOquz8J9o0zuzpC42JPNmEsc1VtnbMUVh + ###5JLQbiBvSCYymYtDeU/VIfFR7F7JsPY6XZJ7yZjSEpVAC3o7u/toS7oo1K0KGqh42l + ###RLRdTG/6nmRkGS9eLULDKBkUKOMrxeZs/S8P1m0zllOn1L0rxoku+1kHz8pCI4Oj47 + ###bLas7tD5z+dZPxxzuQba4As2uemNMGMWn0vSbXoOclbnIucTzE2VAgVGJWtQYwPFaA + ###Z8PbmwDKbSWpoGv5gyM0i3ZKgPz94cH5miQRoVD336PLNN1WXVguvaysjHZjQNtGi5 + ###h+cXUdo2RcWlp+ToymuVU1jvC/+t7BpFgcQaz7R2/nUUlTNpl9HEb7NwMD2+ugJhTu + ###24ypLhNBCxX1N6NM805f/KTdtbEFyHbdxkAUZ4PAKoRffFTZzWRgKrsLzp/69/aeil + ###iwua+W5FSZ1M+XrUp1j/jiHrHP/kHO5ckEwZ46fLEfXoY/ApOXFwKv5QIk3PMUecHP + ###+l8khpyAZRcpTrQvIBVlkhVrgGbh1fuSSOagQXdQipAnP9mXV0NcCjK1qNn5lHYDGn + ###5Q2VqmdlQQAlS4fBVmKtSzmgSjeCf4/tvJLO7rDXXafN3HTIWtHVdP2MfC2VlVRlfe + ###C66TBonUGfdX4r2weElG3P+pXSwynMawk11fBhUE7uoMzxgO5szzCUtrgza4wRWSzc + ###6JnbWqBGmZL15Q2R2rSzEZsnqsgTRo8+5UNLpmZyhixPrpP0lFhEO3vmKt3uwQfMOW + ###dxYPrGd06jVOyxg+dyMEdnIzYakhmPXyaObkfsksZmkrtqOM+mzINbtLfpp8cpTJFZ + ###USOtKdBobHuDdCzLOfNt2ZZ63IOJH1XKk3+RixXIZNgeFBZW5V5sHXMKPdu0ZlIgVR + ###TSnLTnmoo89a0f4clr70p4x0k25AkZ6Rd+QKolx/xO1khTt1eZP12JT/qPXV+lycc3 + ###QCaxSAUvvGhCr2HcMMmvPAUWtOG5FfBYWSfN05BF3yfPTxKVHFWNHOobbx5CaaSxvc + ###NAoaSkE1NKlcK956dxcuhQOf3XvcY+R1OMuGAlPZ5BiS1zlOlZEbausvIbMjL+PRFm + ###MNo05jzOJMIpZQfk3HgwMGG6cgtfkh/kE8BUdrCywzZMtFpKJwt0sJWGQAsmD4JxvC + ###Nt7xZqbVFA7yI5OeEmRRnTFIRjcJaDE+zKhGkq3Y2U1EdBZoxwY1pokd8qnmqWphom + ###kaAq6Z/2izeslt0m/VHVP0kRzaIWk0lbIveHYyEqy3jAhWlu+YURsrNdiQsboAib3i + + + +Valin, et al. Expires February 17, 2012 [Page 193] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###S8gG6nEWMoVJlNVnH0Bo03JS01sVd2FFslQlb4pph3UOCPZ52YWnt/b4fvwAQqsU0o + ###ljp2qxW8nN2jAEIMPlQqurhydEkMv7Y3TzD50NzdV41WBibOwuxfVjmncEq7/+W+/9 + ###c62QGO/cK1WAxt8qibgNn3/7x6bbNh5H9tNDbri/t/P+JZ3P9b3P9b3P9b3P9b3P9b + ###3P9b3P/T7/+ZV/3avc8n42En2D/4mW78yZAdp81E7/ca8c/NgLiC622o6kM9hNsGRb + ###C69vz5882NMtZd5hFphrewbcI170tE4umKUjKKowmUpaiHlUkGZ+06MB2m8KrH+pjm + ###EaRVj/agKMcmfGtaQjv4aEjxrnoYC4vN0Om70xt3+tEyb8oMrCS0QkQv0QyD02bJ3C + ###idkeo5AT0XsJgNOMgyXwXuetC5qoayuknSbp+sALS3BKNWNfacx/xCD6eVRSQoD3I+ + ###Gn/+yrpDvKGZDacJnRA3Pmig8LDx+AxvliEJP2UfcLkeuUE9SRDTBiJl7PCPc1NMST + ###uLwUkrqsJxXL25oas311HYHd9aF2nGHRgBUOXg7+2sP/X4eIhvfnDqNUBnuB0BFa2q + ###K81hvwsvyvBpEN1RESojvsE2h1Of4/0MjXXyRqUy+uSh6rFXr1gt9gmNAxDzqrQbu4 + ###H9LcYjNvZiOL+uo84NbUGRHXv93vSraccrSaQuoJ1P0JKcwZRF13j7ilWS147jHNx7 + ###eardSEUGTclnOyz6bcYNpIPoc4g6JyyEyCeahZRoj8mP1F2uikqZwfsKSRLdqKkOFx + ###vjgdELhuauF8z/R61awesUOqCk9Guxq6ZBpNhv6P9Le2huPz983yqpfIE4GucH0olX + ###a/iNHEdvg0wHbqYGdkYdVRIYbwiFvf7EPPxwQnilckoKSYhnE5L4/4BvL4wOu4jD6w + ###l79cERrL/tPSj+JRyflozZUW/EvQO4VAt+qiBWuBYpOL0fdUNF8FMkUd2BTZ0IMdJV + ###MY46osakUXlGGThdsGrkW8Yjm5SR1Bons0fyFKny6nXW2LTvQuV0RemTECEoKqQIiV + ###8ZUuRGkyA6gcXkEkJYBcDFnhzXndbf8VBJG3IyHr1MYweVyrpUFC2rfA4Inb5AhliV + ###bzM85G7cJ+Rc2GKvOWn41eVK2nDHpW7QiEZ2sE/JrHX4isTiZRB7Tzma5ViUDUphRE + ###4AEfc8/VQhXSIb0riaKY2rWdJYl8TftMO8AhI4R/pWXdIXz8JMYZtM0icRsxJOhuhQ + ###sbBFxZOKiXwRkVcQBIP36hVf2lXjZVWeq+yTbw6eK0APTz1fqnXWQYpTR40VVDkB/9 + ###21VF0JFLfAV0DEeb4KIYaTpWyWiV4XpCR9MvrzRymblprY5LIkQwl3aJZp+qRsy1Yp + ###6aS3M45CGI5TSXRMWn5tLg/xAmSmuaBG48wW5kLEdUN9QpUSpJdpCIXWBshW8GKUM+ + ###JE+l5L47amlMG8r8vu+eLX55svAdRI5sx/3HwR0HC++PWHzBeg12K+yC78sPnCD8mC + ###s+P3R7slRoMnZgqMh1xhse7TzZQ/+vTlj3/c538d7paxdv0kMHLO//y6df63Ud1YxP + ###/8Ic/i/G9x/rc4/1uc/y3O/xbnf3+C878BHgCSukxUOG7hCaAaeT/52Tz9E+E4+cmf + ###yFqtBNsXiVH+uvNX0N+V3AYyUiU6vsYXYiVIx+Ug51PVa6j3qFMezwmDLhSlPH5GCN + ###NUmqIlLQ5ph6Y8oTlSQItowLs+BOHIl4OiCb80GM44qLYLqPAonLxk3npWCLvsx964 + ###6vf5/yjgRkyAJKQhXZTgnvZxJJExNwqyd9F4+vtLuum/7vn0bwP/9ev4b41+qdc9/J + ###eiAbgwMMNJaOAPw/ve7ew2CWxSFIXCBLgN7w+sYDQmFr3B98aiN8jFog2aAqMQLhjK + ###juwvj0LHxqIbTXqwwc3FxA7GyF2iyfUcwN/2YH7yqG7IsMAPwADV9UZBejA9fpIBfL + ###s3pW52Z3RdKexMQaOSQShFmLl1DvxlTKL+V66hO+JF2mSAFhydfo8kvlGDjlG0vQjU + ###b0C5VK141eo8CXztTmPDLWj3hLcZfjZRQBeOfnSP5xiwG4lesirmFwNNGTgCLxTht2 + ###tQtJFBOknZwigkdQzA5AhMqi35dvQGFXRpRiMgqK5dtjceAzvuDMfjiJuhSvt7O8uA + ###3rpXDDCozgeDbe4lnQ0a9wOwAvQGM4xdSAEGhVrMSrvnP2cBTQUN9VKA4h6RTHIhlL + ###wUjPeAxwF0Z/vMHF3YTlxdKVGa4qsO704wcxzmOyvBb79H4+ELFnbDEXJ+OsuZQN+d + ###BB0CEahRG4VF1ClJcEdTnl+8ueaUHfBLQ4ETHPfByFh3vS7s2pSwVhOMUwBs3mWly6 + ###gT4rDAVwx/jFt3lADAs8tZKPAGtmXjbWrboEKCBN32GM/4HvfjNs22eIP2JYQ9JvJi + ###KxkWxIgOGmOcL6PpHWb1/Li93ob/9reXLZR6g4/b2PJH3vAH0W7rxMBLRNPkVDEb4b + ###chPuK74NSrx1HO9wZ6iObUcOcPenIUM3n/OVHMUFyMo7CrvkX3r1lGYPUHYrZQ59LV + ###uWNx8fWp9Lk51bk/Vs78IbrLN3fE9JfOPZ6ZUO2/4PzAbf9P7tp2h3cDP6h9z/s/8G + ###ya9382qxsL+/+PeBb2/4X9f2H/X9j/F/b/hf3/T2D/f8r7P8bbRGcCyfAFRJ12R4h7 + ###5uwfuMzvdX5QAJqWiKBy+RXzC4UUkcxfr5VpN42eqsJFFvMKmRGFhaJWSve7slTjdu + ###IbpWcdErliLliDfXLUmydHzVAkp2HJflnf5Fywq/5wOC75K71BKxqs15YRZpYfpAWj + ###lwSkcNrFLxg1bfZlnrw3vAEdhhnxQm5YDBimP5eSmAYjaVB+kGhM4WyC04bltnU5u7 + ###pgIJ8xCi9wEHp5bTfPd95RePcA5t6qwlsOry+ozxPCxG7XsNyLmEUYpEcgPcUILuGY + ###Vnz+UtJHDQUFb0BqlBWIdnCnmq/HhDiYRrSLBFUDNK3+sHNDizUF68Bt2MHAoJ+Ae3 + ###fd60clIwJGQjnhNEaBjGh0yplUMu8a0A6ywn3BYPmJ7XecN9Fpciu2COHjnuJB88wv + ###sWftC3UMyuwZDZr2E/Co5mFP7Z3F7cHMBZG0t98OWqdltZeuOEWjYR8JynFOAi0p2I + + + +Valin, et al. Expires February 17, 2012 [Page 194] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###pBBxrBp8QDX/AaBrOIISRvBcFloTeOqESEwSAaS43JjEjKeVgMDQbZ+rid+JEKpGTk + ###tHQC8FxHxpUEo+lWE5vmP5aTpr3cpmsPbdrPbXrjoU3Xcpuu86bNwWh3QjS6g+jHUH + ###TTGU00Hq9qOKb9k4xhNR6HX83RQuG8uoqXEBIJu0yINs+9RsnhlCkxbxi3d4qPff4A + ###1f8jB+jBbFUvOhn+ncdeyptVKxuKlCYV7Y0aLnmAtVzyiK+5Ff1l8vZKyH288ekSVI + ###dEhamwcNMK1x2+pN0u64cTNAXy5c6Uo1DwMvrcGwxwg2sth/KxlkUu9BXR/anYOhnT + ###xBWG83IchTcZV6iKdAb3yDyZlwzANIjupzxyvmONbz+8K+lhhhbPv+njtv9qoaEfZf + ###vFJ8//u7Fh2X99r7qw//6IZ2H/Xdh/F/bfhf13Yf9d2H8X9t9s+y/efiSj7nyL5rqS + ###Np5SXvR+D0XSXcqDgaIruu+I9Wl+fxvVHqzn9CDdPi99uZm6XGwt5k5fXjRDu8jo8s + ###m8+ot/9xIyiP1LBt4FgwgriUpUeBQoud37jO5IGVDmh2dlNVHgGe+eBJ6WIcXoH4Ws + ###Zfq7DHjulOy/ljE6VI+M1OHlJPgNlt4WLAzovdOKvkT9A0ya8tKsOZndBmr2nqPtoP + ###1ur9UKtlvHO39rU0z21uS6dzVNK2A1ucLbSxKcW5GyVzpd3dztnjCCRmJSkuWkjz3J + ###zjjO3+ndzk2ohY0H1DjPqHWhMCSP9sGzZikG+rDfmZGFd5A4Q11HoDcL67myaZfRNC + ###ioTuv4rS9IiLc9dvSESa9fs9R3wgzR48ZhLWKxwl3lHAiyFbTMTCmzfGrRVzrbLutZ + ###IWWvtDKvKYvsCmWhfUkGnvAmAi4DYYTpVdh1OBpFAx5lmmea/n+wAuZGVeN8AWKrq0 + ###Y0mPmfmIXas9vKxwi156hbOSH25GyF2nH6rH44TMHgMliRnBHROCDuEDxmMOknI5a1 + ###iKCPxLAj5yezkoehrib2J3VOa9kHbeYXeKq8LUjWam/zpS9e7+RLcQJhQXlN8uHkfQ + ###vV51VH+jwNZTm8CsiPmIf3LvoJdjthH/1cv7LPwymyCSCDm0lgJGyA9hM8QCLGBBoK + ###v2RW0uEvm8bA4nTRqsXVM0byKDiDDQLMmw97rTYGDPkEGJS0Dr9+7VWXBaFlk9+ejs + ###NJ9HQzePqJObwYl6KUMcnusgTz9D7YB5ntGZP7iEpqLhhY6dIlm5l0yYQ8VzqlB0Gv + ###ZhSwLbIZCZcexQw4d7PE2x/IDLrYcrECaC149KmW0yVFol5AuYcMk96cGQolraYdHU + ###U+pG5h8rMYMYqIYqfBI1C/clC/AijoKnzIyNEoW1YDFQnlLjVzIK+zmqfx9CeXJLsM + ###iSQfO1uf0TvAiiAVzE4zLwsLpQ9tWWGXn5PQ4RBhYZylz9m6ugWjdt1ZFXWdSt2fWH + ###uHRM58p/MVt/3/cjb+HHCLatT9zvb/ml/d9Ez7P/xvYf//Ec/C/r+w/y/s/wv7/8L+ + ###v7D/L+z/D8v/kOQmR29TXbetbdXZ+jrocZdXY2nJWmGDy4B+oQDA1bVqdQMNW3SXcp + ###VRuOkVVoeXUFuDgibS99v7lhN53Z2Mwnz8jbjYUbANDBa822vuBmfHx4dasQTmwZGw + ###BLatxipKqgvELa1cqeZT9EY9zcU4uupHjswIlFCyp3pva+cbmmKa4uu+gp5qg/Fn1w + ###EDvOp1MeSziCM675N2yCFhBqfaIYMT5in7EvZnxQMVpPmpYyzZhn6OEsMcpSSeKAkW + ###JMfnjHAYaf739wY8AZMOG9RRK4tDhxcJq68Aq+8Ce2tTYTkPJmNahXIGTF5QOfAo8e + ###mLesouUqQTRfRFOJovZ8CUWLuyaypWeQFwgv51nRtQHEAJui84nlbM2o/XoNccDXuT + ###aH8cYqhvvxzDvMJUiqRQdbtcjcEwExWMiBCCmtPB2B59rnIVhwk/7DrKSpi5wWrz++ + ###k4UOIPTzcCyln/9zIbc4NM/CGg1JHWVQb+7GDG8dkt/IMzXIZGj6O74gePspHwf4GG + ###9/Dp3rcOjDhDr9wrx0U2sOCqN55Mg/HwrmCUXVkPnTJ5tXnqNa8oJi5/3PVSADavnA + ###iu8mC+KXUus+pYZ0xpa9ir1+YK6Aj3bpaOVzI8HEjcWfniYLA0cAZne7pCkkw61eqC + ###hpLJb+OAOKjEniGbPIsZ676syiFdAiWHVqI4e6OtZ6oFbUcPlo9pIhCQrFjRK7ozYu + ###xUuXFSySYhqr9Wq6ek/e7/bqSp2KlaySnUWQSlraW+Aq0obtZJz0UVl+3UbDS+e6O9 + ###KGsEqMQ9M8yAMRnPXGQUMPJM6k6MwnsbI0WHycdIH9hKOkrW6K2+dsmvb6p/NZn/FZ + ###nCrfr2DMx2FtdZVR8qsgNPuB14gnZgwfXwzWEMvhem7ntclo2J4TBl450rj+clwYXc + ###c+cmIXKqclMkHEECqaHwk/Fv1Evpx2I9vG8U4A7dawRhH1b6qBtADY58WfRhlZYTdV + ###5jopPlctp4W9Zkk8P+zQmpsWoR4knSFaVbpSjhrPsDydpX1nl9LkaXS8LBoDftAe6/ + ###R1Lc07JVpWMCWvXER9w5KalLXMoUiUoit3xgZ3Zakl1dXkpOnJQUPLv26CSZV6h7DL + ###rHLWWJFnYbTse9e1aSZiNeMOpHaBvTzo+TxugiR4G2qJxoqsyv+5DmOY4oCn5XavdO + ###IEj05lX6u6t+bzTrlppXy6xUqGldHFXsS4PzTSV8ik8nKu0xPUEPSm9V0tzzoyW6xu + ###J4KF1Rwu4KZ3iNhDcsqH4xqNbkEtmXHgYV9VprpZqjrzznSJKaLIF62oQNvROgXwRg + ###WjfnBmgemg7ST0fx0QRkkktCXrczX4vdgCRShTJiefrNcPQuQgQVGZgCOlHyEbIFWn + ###tdRpaJQVvkWqUmioJuJgnArmQWDfeZrcIwEjG+N4p3TLnE0J6soRPwfBueb8NLp0Bh + ###ePZJsnN6VHiHhRnKMeuynyJz0p4iFd7r7wbUmCavc+cJLpWO+SF+ljtmjRkcsR9iht + ###DYNG2C4ErtgnmZwMyZEpwfC8L8lqapuLYP/+6rUsXFMLnC4bGr0sOgPnZV8jYd0wKh + ###eptPviDNA+tp1iJg+z9kIRJwv+8qJMfdSN4Ur0pSA3BRveAo4KNAom45pJUYXws/d4 + + + +Valin, et al. Expires February 17, 2012 [Page 195] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###7ZTFC+ASqPYuUHgEpdvGi5KrRIFHiyJxEtUt8Z1FMsVB+thcpZFZ8CMqjC24mZu0IO + ###xa6xe+gi99Fa5B6Ob/qy6OjCg1dIzUFbuYAwvO0NQowFha4f3Sj5roUS4CcFypFeaR + ###SOYQe7nJZwV7C6Yd349ChWTBVZgtlVSfhYWOnABrNbxpn96Z50YOPPUtg3d3fJaCmM + ###I+XENlJM4TSAeQ5oBVfD/L2JZcMm8/jlpBTXXTZt2nG12O4sNGs8QbKyFzv1kXgDQh + ###XmJwmgtUp19dAnCiwYAwUeX6IUk5R2KKStWWL1ULcLMZKZK7GyVlnAfQO4YUh8PHDB + ###6jZwOp7TgCNXxoLXHqqHANdYXwVOB/8KcHN23PADrrJcUlb5FiNdRD/0ye+ba5YlQp + ###nwGwj8XrMnUQtSaSqGSAH2eMUgU0hqYos4hph5Tmk1FzBld04AUxS2wsDU4XOvnw9f + ###IdGqGotF7MIySlxgeutgTmYo53HMDz7U/OBLOD4tKafkNc2l37kdBrSPMAU6JmsRfi + ###qwwlPsJDYdDilvCWyNI3QhxXvQ3AtW8SwRLgmkKGCOEtYfDkcpQZP4NRixPAzE7Rb0 + ###DqHDhwKxkmRb8ky1ar604iY5rN0ZSWzxMZe70oBf/cI7m+6VTywFyrKXz0lZD3JZ0y + ###XvY8rFYvwRfKxDSJCPfyq0uPEFR2aoT+ZWKgR1z1toBeMg8yAk4jNhL+uwWXqNQEMi + ###r/Bc9Eo/VUHmp4+XGZz0msvZTB6S253vJ4MFMNKMk+V59RHMlAMs3tjJ51F8lQtM79 + ###LjWCwDmBmRjSdJt3z+BDcIrUXq5k+2SXCiJ1iJroZ7jafbkNBGv5GclSoycteR6HsO + ###I1FjDuu4wAAfRReU229a9lQFL9NEkwIibTfpGcCSAxVvXjDO/nDHTmFUqFCDqjOJ9D + ###V1dbnACXiZW5hsFJ1dThxbERfxbhHp77/mcd//G2GarCCC/SJ38J48KhN8Tvw/+OIb + ###9//gT31x/+9HPIv7f4v7f4v7f4v7f4v7f4v7f3+C+39J/veTvWB3bx8pa6aA197k3Q + ###F81PopIgMCaCFg90Gi7PfuGelfDPSv3i2dtjmfxybmXE8uDUKX6QpHO/jbu7+bcGBb + ###RtG2eKrvODVkkgiXJKujOfdtxbpajN6LMCjBoXp5cIPRfnoDA3mZjbfOT4LDvUNHvV + ###KdrTjaXba7qsRfSRooORtftTrkhpEBIulXKQWBFX0QMlsL2ueBl9oaWij93Pp+Zn3P + ###qt/ed3WoxOnAX9l9MBtpNd/qo8wZbEvdha7gdxj0yhu20WA8epvazMFRSjNa/h5oxp + ###etVKuOZjg2ZhsKSQSQzHHhuKQ1kmCaSZjdoA0LpcUo2KO6VhDZ7xxkYg2b1bq/YZbb + ###2f5bmxfWqFJLLxbs/XweD4intbezHdwOnNmRPLPYvbOYn45eDckSo1fPKncQX1b0s8 + ###sdxeg1sgB71ZiHPD+DMEq5mtZe+x0slTjC2wdNnRura/4V/gUuREeJ/vBzCHri9S2o + ###jXcULFCEz9J5EtSwD87mHtjefqt5jov98fszo83qWnXjamkpusdsvMalyC1xNL8d9M + ###PPk2CCie79C0sEfrpI4aFPL4u3WyvULueRnHZb4edgjKGW4pblYo7N7xxjYqifhTHY + ###CdXPgzC4DDqXN8EkCsed60k+GErpzc4xmuBEXGBMYlMmVxiLDwJwYnA7sZFHef2JUt + ###DMQ/qs1pAeXi5BTJLntUgNxsEV/mjLx+LBJy//c5zL8BEwcux/G/Vqw7T/wdeF/e9H + ###PAv738L+t7D/Lex/C/vfwv73p7L/JcliDfOf+kKGDAuCzqg/m+B/UiP+685f2T8fmy + ###ma59OYZJYBUSQsjakZhzF6LYCLJvHiRhf/Yxc82b+sBLnqU9+q8pTU0aQz7o1QJr9g + ###775ejntddnBwto5ZAEfD/tfRdYirNCKRiHzATiCfbEpdCatlCl1oENMK8igGVDDjWW + ###m3zXhXlLc6zp0pMh2m1i+auxpEvSO0FqZ9NvJXZ2JbPIt1b2CDoyzTeirrfGD56azV + ###XNY6qCIZrRNoyy9/HJNgmtMFl/wHcwllKs0ZZFREn3aAS7MBqn1WoLvFAD/5AL8f8W + ###Ls8isL2VXYwXMrv0yO4xjXvN+b5jLAbOQH706DuzGmchn/e7ECJkw2I0oitXQ2QCPX + ###CsYftC7PF2WCld7AyQDa+F84Qbj6kzr+fX3wYzhFB/97jHxKQE8bdtsZhNI17BesUY + ###hOi3F/+LjX78sMs+QUHut6wYE2x1kOcpuG9ktEnMYTpLvrP/EY1/90Y7wLetfDRhk1 + ###tv/Ucb6CjdMYQ+Wu+8sqzH+3cTaX8IePcztCM5+4ptY8E2nk88a4eeYXFdlth14zzx + ###DPodjAIAenWwq8+VW2P0JjKwIMbwbU9Z5xWMY9tjKDclnA8qloyhAVWpv3KT+vZMJg + ###+8PZWMadBmwPm4VZ7LBZVIwUZbJ6YSb7vhuDf1cu2wFOSgNHQ6ddmbxgmw56/iF85j + ###LXfZM2Ov4Hb7nYZr4/+hTuj3vc57+a/fLRMDLPf72q16ib578bdXi9OP/9Ac/i/Hdx + ###/rs4/12c/y7Ofxfnv3+W89+AFMD2wVscKdRxgndBfEbqfCkVy5SD4KXkIHh9PT5Mxg + ###CCzZ2z42Dn+P3RuaKtou0sFkaUbPrj4fFJGyTtbECevOp1B0fUdOVJ36AAkNvwXmy4 + ###QDiipMTKIWjUXyc9Wh4mnevZuLRMcv3GD0vLQpdODqNfTabdfu9y7fpNlvrtAo6urh + ###i8hmKFq+2NoYcPbE+EjlkuMxFsnn+6hVXMgMMP0aewXgAZH3gEfxt2xkN68chrPgkL + ###Qj8cDzDbEcgXZDiY5zil9t8f7eA0t7NpPf7aT4INtPM/S0yNsb+OKhlXdsaGIZ3Gk3 + ###2G5REWu7CXWJfWh2K/K09zx1B8sgTtx1l/DJLjdSe+pbfGArf8fES0Liv2wSJnuYU3 + ###n/jsT4J3vwfCYmduq9U+sdK73+UMmbd51BzU5o8dNFPb51YTGp2dfhRyRYc6SppOiE + ###p0cn7OTSlCKUZQNIzTONdVDIHiOS2xjLHpILQ5Byf5XHBwlN7FJV+govklGk95Crgh + ###iD4d9ynGliJFMqsDP5Kv0oUvldIsRAWtQ3NYafDRzEKFTEJz8a5mXy56PKyOb3xE5O + + + +Valin, et al. 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Expires February 17, 2012 [Page 207] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###fRkajOJcPSBJrrjCEOqombqjg03QOhmAqgS7+zNbv4WJubC1+AtMFs2f3hSN6qiDDZ + ###MCjM4RRT+E61XztDpbgyiknGVdQTy7wAOiPDZ2yJPiq6q/zJMLZxbZqtsJpyYBw3ZS + ###g2ms0ETYIfewMRbKqSQFDNPNQcClecpV8D7IqwmpYU+2mZCWOmp/ZDO8PGTqKgjt++ + ###1ATvbXTbGX1V28QI3pwy3K4Zf00osQKo/R4Nr0qJWXXZBgpKoYOe+Z1KRcA3O6lyyv + ###tRF8+QRjykzAs2iO6zbLb43EvdVRseJWirAmEe8STnlQzTJg/90a6vxdwyfI7yMhwm + ###BwPJvkblBVvyOFnOfgeVgFLH5FCwnKMvah0TV3WL9Ux2KbcfD0V9Vd/aGg4y3S4I+Z + ###6UcxhBioV4XNaRGfrEPltBPTmIqX7Sl1r1TVk62ZGDiGnvlCJAOdShw/V6njmHH4u4 + ###lTO/GpuFLY+TeHDQ3oXnQRHvoXZozH3AJ53r2VizIlA4Xr4Nw3eNekk/UiqrY1eQjd + ###SzcQTw5jU/ItewFn4yafgCeynKcJr3DCF+45PeU5KnU2WzBzlox62dcmrw3b2y6Yc9 + ###P3kOvmAVz19bW6tVnV09FX2FQmnUoCKvXjNWswhyiDoY7SrpNgqV7OFizDDtpExvYe + ###w4qdQz4gp90tKLiraNk8P95k3a7o6OVyU7tE/PzoPmycnZ8c+W9eI0aUdtXSVUA+jk + ###bShLW3yad0M+GMpRrmyRH+nx1/j9pdOcoGQduIm9ObgmGrSb5zgjqW1Suysc1eXHyf + ###UmNyfTjgz3bVL5NGSedg6MQa7Viz8xb2bK7JQJZbJROjnkVFNr5hFPusKkljOOuF12 + ###rHQYr1LsW3lY0dkhHg6newer02fbsTmnPfbXAYhF1AbEHRyp7ppSxHD7i8crY4hUNw + ###Bbvrl0bNc9INVSouhn4oS+XAiTREHTDl5NpNKIFGtM6TRS2U/ZFr5KOTlUt7zpJPaK + ###kthzkfgMNQ+R30G1mkzQQVQu7t3hrWJIiVFB54MeT0nC033Ka1wl9kxzJClEfbOjWa + ###2TkVo+RUigd3vdnDcn40hOG6D8FYi86trmFSXpEd9Ff9g6F+O4KVurXYHyJApq7xUz + ###f0IGTcqaOo9GLnt/u8ktdvGZdtr8h37w5Du8L6pngaPVWny4ahmkNHyI2vwEzKV9mF + ###66aSpHcg9Pv8Khu/Lat+MS9olHWpP/Zsdqa8/RKZt7aBbmiaQ/5HqGfqDQsVOvRnhP + ###pmgwoTun5A3juKAgHDMzALrdNZUxpP55NRy+lRQHJu58qW4hiY2a59KepPtOxC5K5B + ###rsefZNFA28/+Tg/Qzw0hU0xT6SOPrQxea7KLxR5GlG+di6zg0wGW4eOLTo6sPPtTlz + ###xtlKRIOmRsKPpIaf/T6qJBXVoGUdTnuN5Dgl20hfXSPDnzheUa+JcSc4ZkHWTGn2At + ###JIPcg5PDgKTtF5KtjdTj/rsbBRFy+dJm8SdelhJqvvqVw9TOXLwwg2tMHJcVsqy3mI + ###yUHUD09MzkpXAlZdblF4qaPVtC30B0cn78+D84PWOQhB7cxgTrvqu4O377hdXm3S88 + ###VC9MSDbqxd6upoOIdm1pzvfCrLvssPrNAzRol3IJQ6FBwiLhtoew+y8WrQWngiihLK + ###BoW6JYISjjmTjPMsuuPjOlzZP9s7JWlOEUXi04Xsmx1+3pHN6fsmhtMITAjkLwYN1M + ###wFOMtv0XHmyNHYUIWQo9PSVBQTQD/yyna8QwxjL7qn8gVTxxFzrzlOUlyOYmX9qHwk + ###kxCq2sb6yhV0u16FmYYQfi9deGVWqa493wIZ4UeVOqzcVyB15M+b8PNm8rP/Dw/29P + ###uT5ZcsvO9NShdI4GoV/q14+PHTssvkz432qIzbJ1jWwuHL4yuH2d+8zzK3zMDnUviQ + ###Klit5mBVkz5emuyQWSFv7Bsv6NBMl1TvhroO2xtQokW+NTRMF0rTrf1gcj1KhJLhX5 + ###Tlg8a7V9Hkn+X/zvtiWxEyUPiXVNtmXG8rJZBSsXHeH1MXVKeT4rsTYXndOd7b53o4 + ###ei+5HAp84Zu5vs7ezsIxTJMomnDbHffWYuH4M8X6QmVckGOZ9Sb6ZWTYvoYDxVs9xl + ###XeekCDpI2sjic/07bMRYXOwfNb1q3WeY2n0TFfnKWegMppo88U3/Nxr+Scqzgq3loN + ###vb1f84LYhCrv5psjKcxZfdD8SB0nfa5kEbm61pBeEpfSTdicVBk4P3JCxQLQm1cAZk + ###zy1xkIu+ayOj8KMHFx1SpWbJCTj48OdpjQDXIvbGQqY5d4x0kkfrsOxyKElLLUiira + ###fSiHO332pN6MnVs0h9B0xblmKdmGR7atW8cuL5JAwfbxcfs8MfrJrpOzU9xXIoCpEp + ###r+Yu7ec1VPvymWqt6ZXj4OQji88P20nvL9g9QXM7uMStj7NqeLVCjZs2ePU8x0Ihrm + ###ZCAm+Y1d9qZjSg9mUFcRYdbFupyrwnFPY907ZS0o4GSVzq9b8/KrdYpqiBWH83vW7v + ###D4LFC3A+5Om9Y22vFkDEkf32fdpUgfC/vajONCpGfSwD6wc7iEK7Pa3JpYK64LwaKe + ###R8klgNvhEKPQflGyDBfwKXI7EKk3/VwbcnGNtfImkRKTW7nZcqy40o0ro145JkUikf + ###CpFKlmHe4j4gD3/J2qs2nLtdZmQv35u2HXddyrtbvhqvaYbtAKPR/2WhXlZla82MdP + ###pUi1wti7lCZ14OVeiLHUS4/StlWAN/wUNc0cI+dhSC5E1zCmQRR0Vbo3bx/TSO8nKt + ###e3/9wcWlnx3/VcsvNGfU+e7Pjv3mbN29Djv8NP/sYi/vuPeBbx3xfx3xfx3xfx3xfx + ###3xfx3xfx343470+0OC6xFS1nEtephAOdWJRwV91qs2gy7aGYXIM6T/Ks52ax+tOkXp + ###8uUq+nwfuvTr1upueSD9CqLEPz2iGVRtOxV6Y/rnhc+PQGg2gcoO4gttdYBaOM3etZ + ###AuIITOTzzyMvTehmOe9Ff3Y7YFXKNfaC/Xzxolz9FIfqAejoSh7fd0yuQsiJSZhclW + ###KKOS4WKoRDnY2ml+kkh4xDpij8EEcwhC+OM46k4/pl7LgxxeOu5farM5rR4hOo7pd4 + ###eRXJKpzUkB4XPYrrLPubGQLg5+kFdQhNDMpwIVGQ0PDqk0JG+SDASoVKvR3imNHFKz + + + +Valin, et al. Expires February 17, 2012 [Page 208] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###FQOExqhW9u+6J6ECtRfW34Mc1NeLU7JIuTPgVhv/d5EHU5uTilyqxFJ4VP3lmZAsK9 + ###ckhh/dPKz/bKkdgT/h1WDgvaf7wkz4V3HYXdYDwc3paVhIfRpDcGyuE7fFWge3OsHD + ###/nrBw/u7hHitB78fdT0cSOK8rSIQNlPvXK0SuzX8t8/RDQgv6wE/bLCXUD8SJl7eC+ + ###+4XWHlv0C8d/WkzQ/Zmupsas36N4bwDpsqf4o7miyfB2yuyZ0Yl7FBzKvFLu2+OVQ0 + ###FHgIXqFG3eFf5hxEACrEUONXx//FJG595p/R1lv+geyPjkCpn4zVwmZA9sODKvjdoz + ###XGYcA5RK4DhOopCGpeqytkoD62qrNTmZ3XKTyiCxZsXNJASdiFA96lGQGT9YxME2lg + ###GBWiVrwbwXq+V9nARBJ4OWUETRHcTrV8kcMq+u82ti9q3SnOGJ26u4MbFH6nVcxziT + ###c47SOMJNDTfM4UhNlGH6VQzTr+ow7WMgBbTmcNOTSNkrgkc6pJGoqWZgRbFWpf/z0c + ###JbJ+qszlAG97NUQI0nfuUuKL8misGvbn7QIm1IsuepVC3A6VehViVfHfxiR9fSrw4X + ###BVhRoFXyQZnk/pX+7yb3t1gF9w2q+9lU9zSqO24bS9aKeMa0ST6b2FPqUUq5V0g3pK + ###sVQBBpzNQYCw234gvU1uUX6oWmUhgP8sO1e9HEwzV7W0QkQkvptHpzXw7V8OoqntWG + ###FKAA0naHTVajtT11bqfVqoqK2bXMmV2KWRWHedme49aoPHKu+0XnuhPwQ+e8X2jOZw + ###wIDF2WBMiq/avSQHZtnb8QbbE50oNxuHby6sapBOCWUQ8rslf8N5nrhXeUf9jMebLp + ###/t2mYLFJlzvHZJ4Z2XTaVPo3nzdPO23o35VkI6FJEUpP8Ucfpv8HPln+H+lxe+bzBc + ###nx/6jWaw3d/8P3NqH4wv/jBzwL/4+F/8fC/2Ph/7Hw/1j4fyz8Pwz/jyzPif+FpjAY + ###5+kOY141+dqGr3U6HmvqehP38QjjhOnxXXK87KsflGUETFTU7IyjlxUezU575OHLWT + ###SZ9afiaB4DDKb4QWhbpoxjlxUR7tAFqw2vxI0w02QmTvA0WPmHgSL9hQFLyRpGh35K + ###5MYorV+5B2VaGBsD1kcRH025WulooTisvggF6epXcvjIbzylPXMdOBq/SViqlxIvV8 + ###LYfMsOWI7DsQFlT+tPrq1Dr+ktBrhqU34zHz5YBXjCttO2O7/Xqsi6+U9WZd/0uo06 + ###DXVwunORkVYsqSutvDzIEOlEoBtQAEKZjko5uZd2AR6AUD2/V0v5bAXnfQVlgRYJEm + ###9SDYcjcUHIceYz4KbUAXslWAA+G5YHQTorQJUeB41Y4wIawuRhbdUwoOEQ9vsjwBrv + ###b3ORlBErSSaxRBOu7zJBHc+myI94v1tv1rS2iEE3ruMlQ04GYPUrH7NKwjZqCEPD6K + ###E1w3jcRS9mMfkkPIKlNKM0BgSVpptWKYGZNFzlVkt1mO2QBPNQw8umxirP+6X/5EuK + ###+PNQhFOSU8XPpAovmUMZfy7KJDahpIY4zXeNU4KNLPRk4yROh0A0STvnTuvv2GAMk+ + ###pCndrGS6UoTTlU7Ur4Q5kCn2K7ZQxvqgJYkfkgKyX8dZXqO0SFKIcxVKGFZ8/kD69e + ###sySmKp4fYf03ZiYz9znxquucWBJUZoTVxQWitPNubwfvjsV2+1ZM5pgqPGcxdsURGs + ###xpxv5u2J2lYFdJQ8+ivTbWQk5jGIWDK3Y55vHLMMqLCE92uvOffK2r8JNl/5sM+18i + ###YIvH3f7Ks//5dd+vG/e/GpteY2H/+xHPwv63sP8t7H8L+9/C/rew/y3sf8Xtf8ar6Q + ###w9ETCLCwgjkHITcbsqGyPy44DS6Hx4NRvw7SJ6qEIDjN7n9GgKAhG7BLIT3UB0iwyo + ###0qe1hpKrRn1R3xIvvoHg/hLsBvAR8dkP0SzX+z1ik99mtLZx17YmhgwbstZui68mAB + ###03XiAHe4M+Gj4T6yWUCa5kM4nR0mmuXGnq3v3rx6pzePsrEHMMMNocl0PNzc5p4zq0 + ###3ffb2BtYHty1dXRaibnPgQ7H4v0I85ZCW+GAp4rRGxbk1LBaoR/TuilModfDfpdn/M + ###JI17AKxY6pquvhLhnf+GC1UUFnrXvYQV1Svq8Ba2H8PZEJOMEQF+7rcIKh3/Af3e01 + ###ayjbAcEg38m0SxuCgibt1B62CKHzNJIVG8nd3q0yjNFvMy0vjxunS+PyyCXjVxezue + ###A+icRClux7pZZO+n9MVxLqA2+4yc911QfSvhV+T9I7zcX/xqTPoFa3hzol1s8ROucX + ###n8rKTDxCfTVEGF80BNMnclmKFo+tw4RUjjIyGVqlBgMeALAT5VqPwVwT1hSsFU4ms1 + ###tKYIfcNfl6K6SidmYkNusge7M7r/WmWbZ+k0cBCgtNpBg2lwQF89ReaxRwpKKX8KSU + ###Fo1nPll8p5W7LNS/S/0wKhVePj3v9RBOAp555+meUYYF6xRMhWcerwDMFg9cTqcch0 + ###1Q3X4O2gd/3xPpANRfPlnr/S8XvOWUkgmr0ycHkE/iSEM1qB2i2dIsmJx9zP9QxUQD + ###aWLOQ9Q4JrPONd+GN2FGtFZ2V1o/8fhwhaWulLjcWvuAR7lHZSs4DCYSMLcQw3yxfw + ###whOCVWMKjcZNqbYjYO7DOtNb+ssV70ggpwSvAViL1+A99/oY+v4PMvdOX1S6m1vHL5 + ###4E7r3baUAdlh6DrMtF+eoMtJL6kT4gv2Y3d5BfYnl1EnRMvQLow4VYhXUrqZhGHoez + ###y9Joy9t94Nek8y4Nbiwn4Rwwydf4Juy062flqGUefdhQ+/PHzgHOMWKxLKsP2CaQrF + ###GdK3jNX1ESq9LvsWKn2aSm+fp/Nrpjf8iGs2KYOIG46CznA2mLpujmJA56yoBQg7AD + ###0ioMQ+dBYfYBa5aDy2yn4JTqsX9iJQZrvuF1YDIHdxzgQEFLahZeOXetX6ZWveJYaT + ###hcXJ/vQOJldNlSSWPAmDyBEi8oM0RfpK+Ku68B/S1ObX9lwhVindeOv8BL/vBvtNPB + ###T0ZBqoV6/Ycy0DRzJ04rZ/8v0VwHn2LO4NvwQSvzZOzuI+Kzez4tsMVX6b4dB9f0Hc + ###SBQ+/mF3HAuCX+kCxqF5kMwZJP8W2K/pt8A4H/WsZDHy2ZXvy8llMBGz4LRqnpwrOD + + + +Valin, et al. 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Expires February 17, 2012 [Page 210] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###NL8Ss3H2wErZEXn6y0Ysfy/cM9Wq3N6lZqOXLRGtHpkeGPHOPBeJmhsIr2eNnhoP+V + ###S23c1DrKqXjkpo5Dc2eAjfymU0XGA8X3veFswglTFLpFj9z0a9Ak7QdHAo5CD8JjHw + ###3Bj3iK4kFpuPeRXZtXgM4Z6GKUWO9H44FcTZmC7HSFB+K9M2Xdo/Bw8Me9OVEMPA7U + ###iw5PhYejXJrvvBOP2KwkHBy5UCIDbcp1i8J4SK9pFz2ewj/eHQ+FsRuHsSZMTPKpll + ###yq3OO2lhFFH8Djut6VHfue4cYjGIw/V8vyk+doi6eXxzL0wUvMkO9RKpB8QNFgSwbX + ###SUMYcHdiuxsxEgFvJf7OP2C1+AuW8gcuG5XeRnCalD/V2lHfQEvBqeNQQuLqFznBQD + ###FWJZFaoDC+BegXrOQ6qXOY75PmlrmzeDIKu9FVOOtPX8A+wE1/deVhr5liR96ejT+D + ###+pIc8Umr6dUMdqd8RqmnppdQPuAbzKhbYs/iAXqmEDnkoRlg4dKncHLxxB1BEnqoRJ + ###D0MW5NLBNj32gMK+iS2HpsSML1LrofgUYRjSnspcBKkbLpWLw7ODuBN2ftcz4yZYYO + ###5HFkBjPf21OAM0AkndWXSYyP+T/O/sOLWFK9fq2zkHbVA/WNER6v9pPo2zjsfbyq5l + ###XZreZFnjrs8XR8ZkyqeIIDCwAvl3RU3ryhDKIrOm9obu861zjrP4qF0ocsRvwBw6bS + ###dyIvLpiHDxijBsPYkynlpwmLwkmP9vbhgIVdHiE3NtUwLfUwNGu2Jq4/ETuIkesN+C + ###WnHvCFyF7LC02icAy/k4FHG18U6SAUtEFklURoJtcDkBt5cSsfo/76FZHecR1FNCrA + ###4aeKFs5K4yveVup1E2sW4qNFTOOosoodPlNCZ9pFlVKy3lQEcEEIgZOzEaCWQb20ux + ###o7fGcjNzb2NGv6+Hsp3rGUnSxpMlubjyyltbW2D71ORDspcu9APsCbjWRrwjOVic2h + ###Ck7K6ijoRGs4uo8Y98HwjlkN75jx+D03jrA6MsMPIRcJAnDHE+Te67B/Zd6oIZokPY + ###pKyRJbNnYxZYVmN2m0socBVWrEwSRChEfWoeuWEeGEsPxmIjD8sopZNvCw35kRBUyY + ###NCiO3ZULAQRhXLQuSZWCFl4FM9+UtRkIcues2W0w+W0c0BRI1vgqSnqpCQpY6FSUsm + ###vRxTherFKhFgXqxUA9J1Djanc5E6g5Fs1uN9k30Cj0oHUySyhMqSlBMc5SanKCoJiQ + ###urFaLEdi4iM7Gv/glEheijhUWogVXsy9K/AyZKdLYiotJOfiThyqiVicBwkvTYDb1f + ###RwiPbexD2bb0fSKq0OmzKr0FhtTyyK93yJIlARMV3hrDIBiRmOU0fd7KxzucSnAANg + ###EQe14z2QXIlexatWWphYbc8naHl+9n7PETo6jRPSmtlvttqudorxF3axkqMayHIGR7 + ###zKWZ/TmpqPHrk0mZMuNm1yITyc6taU2EW76y068d9dR3R21JmNx9HA4HS+BOPcoVng + ###ZnkcEgO1hJBO6msLPaXxC2VExgxdQz6qZqazQrrMOXVMSbu0sQkuxfba5cyw6KoSlI + ###eUZk7IREoL84s01rF7TQFbE9qi16HDOjyRA9v/Cq9gv9H7AruLTqxiCCWLFrRkPw/b + ###fc1Rr4gWamugCv5aWnerH//6F3uqTSzFPf5e5//5/h/nJ9/X/6NWbXgNy/+j5i38P3 + ###7Es/D/WPh/LPw/Fv4fC/+Phf/Hwv/j6f0/3kVhl42HqIsOx5rfh6mpq0r7enwhmScY + ###OztrB+/2mrvB2fHxYUZFxvwlzW1kivqblQkDG0VlWFx1UuJ3lc0zO7WoHuqLktWaLi + ###pcWcxwUbl03CNZ0TDQ+yPdRGRQv4e4rGTd/PoIDWegY6Em8fkY0Zp9JS7gadH05sRH + ###f2feQ8mJV6fTh45SMJhfceKwbBeJcdAfdS4+MVYsQmTspmCGrAxxt0OWZ/HDqrjSmh + ###jD+VFOGj6i/X5oXcDJxCx2IwH6QN0HeTxl5Rv4CFyQnH7nIyXxuYu4Dvxk+Ih3RUMv + ###mviYniRPhU/RsIsmPoNHuJdk4XMb3QbDqyvh7PQgfIQ7DUwyZCpocAgqdgF8nPMdV4 + ###SAm4wnJg+l4EPznW8ZeD0Wjkb9Htdui6wwqdlGb8qsr/jM2HEhxyIuZFpUyBUS7/yV + ###KXPH0eeZ5YuzgvLXbgreXNprE6jn/WkYXFpLEbxxXU+ELYJ9Xa/MPgenvh164s4uSL + ###jdhve4hbgPwstJQGD417vgsjed2N2cRrcjzJnRjQbDWzMVCHyM7qfjkB/42Be7xuIo + ###iHYt92f25+AOq5dZ6+8TqwfioIibivGLDIVHP2BuJFfIjbOxQcrxOPuaJ9IKdl+3PI + ###wEvYpHHXPSJPc65diiARE/81/Hcbi91+wZX16UWSmh5QfxlNycRPAciwieJb5KYEa4 + ###VSO2o+UMYZ3AjUWYwmfKWAi218MpU144UZyy85VYJa7D9MRweOw2waur7Br0QVIH1Z + ###CFf5/IzI87rb/TIdD44kaLOYnGUiz2yqkQmgZpiZUrHmXcQVdDFQJiug3EnVrF4JKF + ###6iXWZF3AcaziFl/qg4FlebIfnqdaDK3pURUPqbMT5ZjvYBBt6JgjEoaDylzxbHty9B + ###yFzVE8v460AA7CqVukB0xs/jBjGQgMca5Gji7jsbSGnJ3hscN1vDPogQQn7uhaVmmE + ###xTMRGRRxsKRGmDN4mdr5s3HcdZbTeZUB7SJvmMrx+UyosJ/dWEVtzDW7clBMeE41zc + ###s23ogUgoqfx+eZnjRW/BJnQNou0U/lBGnTKwoJDvvUE9gGr9d0X7bMBtVMjwm3Vun/ + ###icBy+Hs9LcAYVMVL+/IAJIhxEWw/pHTxqkrCuViZoCTpygJLBaolpzEnGeWhN1oweP + ###5SZLO35jjaLhW+vxySuzTwlc5WN5+sOU8GR6o/gXkY8UysdWuqys02R6GsLIqG51K6 + ###M4zSJGkufPoIevKiAS/qNYCsX0IhFWJQquxDamjCXlBJxCFeQRBIjjmkH+o2uJaD6s + ###lLrMN6EGO6orxYZdW1qndlOOEgYKWPqioks7XDnhd0DIescS9YCtsJhUtLcixTvKsh + ###iSW+ZWXvdsNTvHuAt4bUMvyA0RWc5LHKGge7zoyVgIAusxsbGwjaJQ715l+KQZgfGZ + + + +Valin, et al. 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Expires February 17, 2012 [Page 215] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###/S/9eaGw1b/681C/+fn/IU+n+h/xf6f6H/F/p/of8X+r+p//PyoO4f7Idnp4D/rIgQ + ###f8aDPH+B4zOjVaPEZIonjqG6gchNB7PHQwofJZbFGxwU4PjAiBxBZWa3I6/WO6Jfeh + ###iLhwcRUyIINEHbG3U5K5wFqtSBFXthLHIeyfPOHmZZRVYP+0p3HFstmqeZ6pYUXYoy + ###Atq6g1CqkXlviGcOdqIps9/DkKwpnpoyV/P7szDpT27rdAHCVI2pK73uoNEb3pSc2M + ###O/wrJCzoUtfDg6CfeAox0ehu//l66rY+zhKt59XsfLzxvoRbApNIysfjR4P2b2VWH9 + ###E98vOzEFS6Z7na3DoCu9UEjQ8t4mqfDoHtq1lLnyXdU1DyKLwn/dkdclkU6W+fV/DJ + ###WPRe3k2FhczDCPpC5Cqf/Rkvc/x+PX/yZkPOI53UIMdk/OWwuqgtn6X2O9uVa34/81 + ###1pqF/vcznkL/K/S/Qv8r9L9C/yv0v0L/yz7/ZVIR6WfaWeaU8gVxbe9ByExUlnnxbu + ###nenZvsdBODW9PfBv+7/uL7m7RmbTEs7O7tH17i6cIX+HeTg5BA6o011uhanf1trHMg + ###AviaBbwuO6U6+rpidBhTvNLD2wp4G8Eq/9vkfxtaG7zdoPbie0Xr32vWZr3G21jlfx + ###uNf4r+NeqsLEik7G+dt7nJ21jjsFf59ybvZ0OLP5OGa9nvtP42tf41/P1rsjbqmxtm + ###/0S/GgL2+h+DvzVG3I2G6Cef7yZvc1P0l9dvisXwWsNf01wosp/P0L9V1q8G74+c70 + ###32vb7GYNQbgk6bcv5l2+tiDPzdKp+rZtNccw2Be47futaGHJuNPzYmp5813q/1VT7v + ###HCcbvO3VddV2Q8Bbt/C48XT8rfH+8LGrfvK/DQar/rpu4lOf303Bo3h/mvxvQ8z7mt + ###XvddnfmevD7h+ns8bqOu/nBu8nf8/nt76h+ldf42u/wfHzWuBa9FvwLt6/hlh7dW1+ + ###12b0b9XC44aJP8F/+LwH61qcNUFvcq2LvzafUXhjf1P4yzzbzy6IJuHHtcvgtX8DCp + ###p1Y3LrNf53nTOG2pr5d039dZE0/19PG8YEBOuCgW9IxFL/OKOs88X9h/Vvk0/MBp+0 + ###Dd7f15xB1V6bDIpvoIhfScAbTXMM9t/Gqr9/2iam/WZu4ELAEP0TG4/A62uOz1WOTz + ###6en4U/Mfa6WICC2fDfgw2+KF43jHKIx1T8CXyl4W2e/nH6qjcFI+f9rYkFX7e+C/rc + ###rNhzUG9aNLAmaGHdwH39tfor+1cTdSwGxcco64p+8n5JQUjQpcDv6w2tfzWzX2n4XA + ###B/Oq0aY+OCh4Qt+svfB5vaBvTawnl90xwr51U2/oz1oWgis38OPsUcNc2NHNe1xF9t + ###1eyf2PwFj5L9rc/kAVAmk8HjHcKwF3+LewlXLRrI2F8jX3/xd11w4rBec9xsiD4I/G + ###6YfGFVCD/6pm3TGu+jmA+xZ6zWjHErQYHTnLYWZm1g+vjk3uUfokCnGIJgYYrUa8ay + ###UyxZDRGm1WTnr8XyEOyRo1Gw0dcmW6o3FPtSy6mZOcTkNu71QkrQSppn7RJFGFP5FN + ###tFEPBtuC6mqWH+zuVNWV6XaUSZVUHSYouydDVZblPCcvoh4W746wgWt1GTuFfyrZCt + ###1sy6QtZrclwKXVPI42seHU3KvqINgQfRdyHHChrQZGSh09TT+iPa4v0Ssub6posPri + ###dJnUKOcd1qsyH7p3RWwe7FViZYipBb+bwIeVWOfdWdWymPNs154PQrtxbR79favMhl + ###Kpa+wK2NY6HjCJm8qY2Fszy+zdRXhRjJ8S+2cU6DSmfQ9VuLpuVWImhM6KiC/WzKsT + ###nzwtldsMa/Cx1P6FZyfhTtu1uY0EFWTXqoi21GsHHB5rWxCJ1jVeiUtk1hzYEvYKt+ + ###iDndNGm7IVi6pVvKsWu0zrdERfOChux1lKcfXFdcFdsq/87ptS74rBcfHA+rgj8JXV + ###foOBtp/ZmDg9a9HPS1OTIumAVrNfN3wX2kVljzcNA1Y8UqDmq1JTClWQ5ku5KD2hxC + ###ULeYVcG5NA1SYE1qhjYHFSuDU4Sw0qxrFNGopbRh4qFhKYC4EypNVsyePWvWyhUrlp + ###era1xY7tqbgssJ7iNm3qVI9lcT5ppCQDW5vRC+g3VhTRVjbsi2XQ4q+iwsI6JtPh8b + ###QlAVnF+z3AhaElxNUnPaGNRupTiowBGH5+wGYiUrYYrV1PqRCo+vWLk7iDkWVossDs + ###rpVFr8xBhXnTG6HFTA5d/ljiqsjHk4hrAyCQ5WT4UvYKdzUG6tqb8218l605zb17rV + ###UFgJBc3bVtg8HFQoToI/1K15EFKTEKT597pGp0KadSywtsTRsPszBwdt5OKgwqZucR + ###ChGkkO2szgoEIGtW3GFjcy5GnBQcXIbLlNyFhcFhFt6ytV2AYdjiUoRYyxZo5lTWtD + ###YtyWV0QbqybXWxf2SE1uE7qIHLdNPU0DX3JX0NRhqcIJOVHuDmncR7S5rnFQS8aVHH + ###RNjpsXtKgsi4OK1WbZ6jkF14Ustrnm2VEEraXLR+yvkEU1GVTKRavmWMQuJTmogCXm + ###z2s/T4Enxsa/C9lno+5yUCElSJlHwNuUcG2Y6fZmWwYWMigf46ra+RTnEnK9OE+wZV + ###8XvoDtci4hC4sdhHNSsfNm6hfirFDsXIKW7HWUpx9iRxE6iFhr4jzI1T8UBxU6iNDV + ###bOltNa0/c3DQpo+DNi3uVrO0E8lBOTZF+ca6h4PaWryYXYsbSRlUt3LUTAykaqk2B9 + ###2Yg4NaHEUeLOgc1MZ0ioYpVrSgZIODCuoROLSpxz6RE0bBpouPdUGhNmWmcYO6xkEF + ###nkVf+ZiE5UiclMtdQ8ktqRzUWW2CuoURWlm8FD7ETir6nC6XsL9KNlNjEfQpjJ7Wqb + ###+wFEgaUJxsNge1Tszk7sDpecOzswkaF1YDuTtsSLg2zPwcVOhKHKdyt9C1Zw5PctCZ + ###slYG57J2dFsWFpZEAUuXQSUHFTuXPccL9EOudXECbO+efO7r2tqXMrngnMoiNaM/c3 + ###DQcHh9ncSTBBjphu2KY/JRBUfMi9hhhJWpJvHm8A1BU0KKFTxAnMwLg7kw6td1+lzL + ###Gk/3ZsBt8s11awCr4tRtwwQmTg+FWVkwD+kGsukyYMEEBMEIRiNMTsLdYUOIIxoSxC + + + +Valin, et al. Expires February 17, 2012 [Page 216] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###TXVi2EiTYb5kQLpUNTFO025AmnMAWKEzpBJMJEuq67FAgzsW2abyCC/2hH63/Sx+// + ###f3a89/Rr3/LJ9v9fbTbrG9b979Vaba3w//8ZT+H/X/j/F/7/hf9/4f9f+P8X/v/Z/v + ###94mdsT+A2FJT3Vw8luuHNxETRe4DVjYBRO3LP3O+cfsAilUGalrXhmIOaD2LyK6mWz + ###Xm/Wgu9v8DJsbQVlefh3De/ApjUP/QlhGe5juwcnn4C9hL+aoKj5OlksGuugNKvm17 + ###D5zTlb/2Q2r3W+8Xr1dd3uPLauRbyjBvHir3bbvBNrF7UZSpZGyX7cNtHEb5zvx54L + ###5lqwNqpZ3U5wolgi2PDjppW2mpdht5FFbr46C29tdja7m6qrFaer/o7K2HVGk22eod + ###doEtMNVvxN2uVzhPVjAfUuv+gdxbB+GC6rHVMSWR5zz9ump0UKrUeYc4bOM1jCLi2z + ###N+Zuc5g4L6jN42GSBNe96MZ8p808FIMZk8i5ng6M2+gsLTib+CS8e/+34E9bBrXwX/ + ###VAeBbNsuJmDlWn/pYJxUlNTiNMyTju42QaFt5hGkukppY+VQqzc7QmR9Zm88/HVgk0 + ###2mMEURHTqcdZ40OEsSR7g8nyMh9lZjrkzKF9GnUo4bETNuIJQ5tSm/lGxibpe55gHB + ###7Q9gCA8pEUM55c4To8kExWyke4KJMqAUMtPz+jMpt9CrPKy4N8oToxFTJLZ4w2qknc + ###H4X6T2/struV4OsbNWREL0+vCsOEbzIACM4sxQqRS1+Lo8GoQEsxT5oIqEvtKCG6GE + ###Xtu3iCXCBRcTKoJUykyhb2Bao+ko+IxMaJfMe6qY9GJWzW2JxbMdjaCi7+egYyAstF + ###bgX9POxynU/rv0goQSkoROZxTCHTvlV5oCMRAwRvj+hLlsKNfmXhRr8GS5Jf6omO36 + ###qVKXK3X4qCMrNxFaMyQhuejOI44q84MrtO2SyHj5VsA5/vxjeHThRmjTFpuc9lzm1/ + ###wnN/q8tb+qi17N6XQck7+CqMsWxk+A6WMSV61mAQMy7obZNyfP21EJCyePTHzCUMa8 + ###JMWe6Ux+dlGgZEANfd3VRcVDRElH2J4cUwZmVDdyry3tuy47EuO86mVZyuL1q8HneC + ###vpOOgqpTiJrV8UF4sXMm35oBjhx84jnGfLne7SYutfqvAnbubE6xUIxEG5gDHs0xUI + ###wybidGVGAAblDN2+DX8OwIM3O92zk6CVsXoP5TjCMfzWlsOMGcR1DIWnQaY5/0R9a0 + ###wS/WLKXDFoGJ9foSJm9l/+hXDDALzbIET/3ooWTtJ3UTv/gswBd809KVcW6FumIuB2 + ###+NijaGsm+IGt0xIc2ZsG0v0nZ+yzthq88+YQw2jGY1bcJW/w0mbJUmzBmizii0afu7 + ###vaTT+JSHhzKFpIKXOMsWa3oGdiOFaCELtaJvcXB8tkfMotvuxoNJYsVv07cLFH+gNM + ###BrVHQuezaOO7wjDR4amo8HS7PEftkMUAcAg9CJx9yBQo2WjVG8Iyknu++c1NaNzlNF + ###7Vdtl8jKsWWJ+UJHW9gY4dhNnmCF0NoSNZ5kgGjbBoj8pgfztzTTgyeSf8DE/Yodzx + ###96vrTLKD5+aIeUIw3Z0OH5zoeD8Pjg5N3FeyTAJf6WJdy0WhhHg46ipEqwg5QbAm9i + ###bSHVsnXkJvFkVWM88LiNxn3BvtYq7I346uguveimEnQ7D8BVkIyxZ+zbbfd6Uud/Gw + ###44NCfcPMJ79gHW3RLBgVHBRwzoF0LL7iChKswVbjYp6OFvWUM4YMTXR3SXwy/UMH0j + ###psK/rmYrX3Ihz9K9oEl/YtP+8FsseSHhidblS+sXKc/p5kGN6/QmI2xNvJidF5WxQC + ###JyPCtbCXZGo95jsPv5AE+okHV0h9OEiunL8uo+fhjBbMTjDBapMcGKE10SIFCOSRFM + ###UnWJFD2c6mE/GAy7CZ4L9kfDAXRP9EGmn5QdhDnkx6rWStUWA0wO/ybzVECHPhz8Ev + ###y/H379JThK2HEjKpTsHPS6+/A/Wm6KoNTdqr3pvrWp6g1syGW5W4m12f2itDOZ2MJV + ###Gba3ybhL+S6sd27uC1so8GisfvFAw4KQCcztSJMQvOoTpaz4LLvPlwy2tQxd9+vORJ + ###bOFkQZOFw58LuNQJHQ0zfGF6qGbhlQFgA8zO0N7+NkwtkHMl1pKZjcD+XJPp2pR4lJ + ###cDfMljkcG0SfTPth8jvsa8iwSsFLyaFeClbGu16xMSgfH5rKb2aBaAgQ+EHy/lSUe0 + ###FI+4suC8oRsNaBbN563jcEr6agr5ZRZswsL1WG+FvApIl3TQ0T7FtjkpKOuGCM5FhC + ###ga6ZQlPVgI58dj8dUlJlVK9Tzbs8v/KP6J6PC6d3Tclr8WQ6IoENuWs2j6OtXlHOlk + ###f0Zc2bW7oqiL+3PDIj9SFCXwEeLfdGFyCNrR0aM44IRbJrhgd+vFhFf0jT5q7Grln8 + ###bBNiurXPkCegD6nniMH8HXLoJAcwfqy4ADBtU8OFcozHK4wU3YMfURsQU3PRoU9wHU + ###MuyznlEM5j8qYxiIooDXcuENnb5E1CHiqWaWTu+cFnAf3UGkd1i9H45SxLoTN+sRox + ###5U2zgd6mVpEyP+dtOKnB7aZSd0FDR7Wl5lSlzdGWvVmVU2YLJ2o6MKeKdrJbkEZIBM + ###OVag/JSPfFd1k8T8fM3KJnzZpl46DNBqWzLuYjSmIm52LzsOkYzeSR7hxTpQlbzBg0 + ###STmUNCQTJSOY49N3jfDo5FfqFNlZ3h+9ex9evD8/aCFWtT7Zxgg/MCCPOYAdn35WsK + ###wG84AThg3z5axhWVizOZGPGjGDlQ3ErOeSoM6KpBKHX4ytgn5ltYyDbL0fIquUbd7R + ###DDa6jqeOiUy9RG5Gs05MX9GRQpA8DkB2S0A2Z+nF0d9PlpjVhqbuBVvimyWW13LK33 + ###L7HPHMAtpa1DVSXQ2UmpuBmSohedm2c6tZW1jUVzPMZ24HZ0z9apEzmyad1DQ9vwHk + ###FLxUcs2HndZfLKJF3XYwHvbQRtIbDkc2e9KVaCv9nfno+IONndLb8f3ByqWX2ixL8K + ###a/qljNVutas/Xna7ahNdt4vmabWrPN52t2VWt21W1WL43eE/Z8S08P3JJ0S5bRN2VY + ###STH+fhYbK1NKgQ6/uBs50CDfzc/1rXIUjSezIfJcfIaNx2VmJqpWyRhB43wPovBwgA + + + +Valin, et al. 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Expires February 17, 2012 [Page 227] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###+9dZpmnSbWWZF1Nnkdo8qqWWWdqmzKvq2ZcFitowF/vbppvF4JLihG8RhDSneRvFSI + ###Y3m3AvB0P8RbK+0oiVl7q0v1xtIaMOPGas1oEHN9TII+XWbp3uFtjGhMJr96o7bC6j + ###4P8b3iYWPmikFixpj5SvuWJttUuCGfBeQI0Tjs1DPUFB5XoxJ0O9rO98baFZL2OMLd + ###tB/3L82gokYcFStSA80vH4baaj3hCn5KfISZSrkSH4zOS71S/erTwH0a5qJKta0/z2 + ###8FmMMCkHmnNQthVpaVfEhLV8efpszPa3KYx9wg3Nu9XnLeywTidiTlmeLXXWCj6LMs + ###crDdsk1e97fNJdc6ZrKclkXcf0wfSOcQk46ZbeFYW8F3/AqxZSCm46dZFetWRWk44a + ###DJfLKlOJbXdJLqXlfSbOLL0FLGpTMdf29NRmbVMjieYciwNJsFrzQ6HsMz9VPi03PP + ###0QLuAHTcCcIKhtRHSmrC7trnAjtdq0BXWZ+sdD10bCPQFtEdSkIhiUJchFcUKUVsqy + ###psSJ7RaupaV9fU0M0SEeRxENEsdI6Gkm6l08kGu7JMDWSRTHotnX48lbwWtK4wumyZ + ###tChazeFikuLzKJjaDA2xiMNbaIj/mhrik7XDF+ZWKs/kkGmx2++T+6FCCFNBZCnQz1 + ###60RQPGve6nZ0xYSGdQcQvZmnY0gjvhwaYxqkXUBtZAp3vtpMcuFIhCgSgUiPkViB+n + ###H/DzQMXSLBEsp7idRxo1PVH40Wau6ykUsKMeVzXXfp24eGPsGMLwW9DYjYYTS3bXua + ###GFPZTBjd+RqWHtXJoOYCkfYpZNryIprNf5/VnBTdPkdB53YoQyCIjrSbcTU2gKluXa + ###lqg5uqpbWiwIhepq0DXDRJiv0pUqZxbsXkadDusiaQ/Ab2LMgAYiWmY3l/VuBtWuHc + ###Si6rge5yINu+BiKmF+ovIQlvj5X065Cxy/znn0O9/zH6vzedwv5tT4bNBZLXoOavFZ + ###SGn8o9Ni/sc8mflfQU6NkyTEEIDJQplf2ZOd/7Veb66vW/lfa7Vms8j/+jOeIv9rkf + ###+1yP9a5H8t8r8W+V+L/K9W/lcrDWofOHdK/tTJFAMehMqznzKk4sEsk6HI0fc6IEkK + ###9RF1GOIIWewghFsucOMYs8DI+I7rM6PkYNB2syi9Og2CA1YloCqBrOI8XCcywBDbHP + ###YEIAZmbzLupYPhVVIBaYmLCFRyG41ibTwAo4U/tSZorSKA1W32k2MbDoI787cmXl4c + ###vSPEfayvXwbmEZFtHoYuwPoffPsQPbR+H/+KF0kQ6ZXg92k0mITMU0oFIsR2Yb/EjQ + ###F3svtb4PLHF2e4l+NsUlxsniVKj4ogxrDXH6zwEHIrzAp3gbvX1lZw8VfQFn89hfW/ + ###b0aJDqRHN940DZZYUOvuTR+IpQS/NehHDgLnpboNHYIu7g071NtqUG+QBubo75phT+ + ###/gDOdWBYeQzHxcl0Bhs11WVUwJ2p1pWyaskqetutmHhfQZIGOXmqEyjG14XwpwEHgX + ###u9lkA25wtOhdb52ch53d8OMGlahjjMPGJh88RerQC9MgtUNxr8UzH2IoHOf1hEmU6L + ###yPQa+GKMt2O1MYEbcJoajErox31KoXbRDtbPnx+8YuZSCI+TjTmyX2Z1lv5jxOTsY3 + ###fJ5MTGsU4Z9XdWmP3Yrni6PZ2Fjf0NR6NdVAeSOUjNjw0BYzGHZBsMI1jiuEE4DhYb + ###0YzvU1zrpqxZYvpdFqsL621lz3dv9kZmeJYzG+TK/9i5vAHbEvFa2rFWMtvZSMDhZt + ###lEywGE+ZaODgkA77GHvtVLz40aOlnn6LxyiCgng7UAuOzQjJ1vaPzPWehbq8ijAu8z + ###D4WGNxhD9i7o0nzVMKYdnz90pOiz0prXgiuzwWzquUCYl5oDNWkqwExywiCy+RxpzR + ###4wi1hG5vInl1qYsBxFl4//LzcG5Z28eUl62GR9NJiB0CdKwx3oXk+YoWGmdg2zzfkY + ###8fWx0kZJ0SFlgv9XuN3ms/+Vqpp7P4j3J+rtBlFRXMqPMVtEtU+wRC9T1VHMR81NZY + ###yKAhUdQuZ6Eez/DQypin60hd9VpjVRKXPjFR/6qDFvDjnQ+7+zvh6eFh6+DCMXiyZ1 + ###mU2j843vnrwT783QOBF1QCmDVjPbRQnEn2MYpf3MHMGYmIapjRKqgcB3vvQ5DDxSuz + ###VdAzY0yNC9LHt+7kMfy4qRNL0FhjXG0WmKOTs08X4cdPOyRba2AYRhg5Ag57AGNWW3 + ###unqBDojRltsbWXtzFo5eSCz4AYv0cQ043P7kxuGxbn7LJvgwYvW5iX1ZNl/z0+21Op + ###mVkilIWswNn238bG6mrdsv/Wa+uF/fenPIX9t7D/Fvbfwv5b2H8L+29h/02z/75NJp + ###1e92rldjvLJjy/T/ArNBGDmBUIMUvkm0t9WJWT3T8FpHWgVnsXjyYBXf+BRnqPkkub + ###VXjDUe8+ekyYwww3EYAmN+T2YrsKuuyd0g3UIbs/z3IMsV0PNTvgp1SdV5l/TgBMfZ + ###12coTiQUWFwhLj5hgwQwfrFaah5H0xzOkemRXTbQqzOnt0m7D5jLEB0+OfXR2ABzsn + ###zXzcppkyRfjH9p62H2YjiK91aOSdzkG14R3sM13YS1O94XOCSqwR6aCOWNLX9OH4QD + ###mu9urx3RiQw2LvhiLKbhpU7dRAv4r6YFv0cbJHgMY3XiwsJZojN9qQStAEmjbW3+AH + ###EV4Wv5gZzRLpPXsJ5apB/Yvp48rSQgFl9TGMZafbtmNIiH6h4YP5EVIyrWBJTTr7Yd + ###mnJQvXw7pdpT6zSsOu0phZpWlXac6ssmpXWZ1ZZc2usjazyrpdZX1mlQ27ysbMKpt2 + ###lc2ZVV7bVV7PnkqWXE2bSvwhu0rdrlKfWaVhV2nMrNK0qzRnVlm1q6zOrLJmV1kLrD + ###WlLaR4PDbv+DGm3H34otYT4qJqrX+6bIb7yeoi+8lq/v1ktdhPiv1E209Wi/2k2E+K + ###/SR1P/lxnL6xCKdv5Of0jYLTF5xe4/SNgtMXnP5fktP/OB5cW4QH1/Lz4FrBgwserP + ###Hg2h/Eg+dnwfNz4PkZ8Pz8d372Oz/3nZ/5zs9752e9Fuf9YSxxcwGOuJmbIW4W/LDg + ###h4ofbhbs8N+fHf4wVrXI0Vv+k7fi4K1gVRqr+qPO3QpWxVnVj2IjhdfDnF4PmVyzYJ + + + +Valin, et al. Expires February 17, 2012 [Page 228] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###o/m2m6VylpWPmZZi5YjKT840IUDj3vPbAEg9a93VnTGN3WvOKW3GN+CvHeSMocJXGw + ###/ovBQLK3cU5uFUkKFbxP6QaavRrH0Z3GaQjSZj5Im0+HVK/lA8XtSk8C1cgJqvF0UK + ###s5Qa0+HVROquBuVQuC6sTX0bQ3MUHpJF3z1MaP5l2xDGYtmDRfnnoCTd7lWoXXlCkz + ###9auW7KbIv/tVkaz7H9fdQYc2+xC5++IRgGbE/2murjfs+D/N2mpx/+NnPMX9j+L+R3 + ###H/o7j/Udz/KO5/FPc/8sf/0XV4j5w0O4gPPj8pkI8ChReiTf19zmA+pCXM0N9hWw8p + ###L6Kmxws991xYJCjgBJVSVqD5QT1cfnF+E6BadIF+tq3Ab/NkT9eNIYTP5+OLMyva0B + ###KGnwhPz4HpGp89UYio4cE3HiHDjFkECxU2Yn8kI5UGkjdyctw6xCgSrDiqaAZMxyz7 + ###oKL12/3Bd2MeAxgbAkKH784YTTjL9P3wfOfDQXh8cPLu4r00McIkfI5RpkAhAU3A9/ + ###QNs6nHEfSKhcaRQXHsGMMjb7gRO9Rwyn1/jliM5bztRKRViMf3WyKegre6qsUmBWvg + ###s2W1smR+N/TUpwUWeaXzL43AeVHjR09JB0G8E73JCHVhFXlbf8nNwjDNTDneNgIV0Z + ###I9Znb0ZY3OX7Gg0XonMR6LXNt2XnnimVidbAgjI3gKMyPgIqvwmGCeuCoVxWfMSDtO + ###Z9maMmPp6AGh/FF2KlkYw5Hy3aSFuwnIJSFtzyc7xyHu4rJH+we7n96FLdhUD+hFKc + ###CmKBbPSicSvbKGLqwR7jsztJe/cbbUePMMi6JB/MaaEFucNl8irgtNHEXQ0RLV2/PH + ###QnXgBKrAdd6x+IgfXvLYRy99r88OztlrY17ZSPTy/Sl14ONr82f4jYZyPLxXiV5mhF + ###LiKNjjOyBiIGlHPeRe9sgRJL6LwzaMVBu4NpdOu+MYd3FsVtrkfe36TgI0flwJHrIX + ###q5ecZq0OwbyetkJstiEw4MkEvZTC1T6dZPI1qzTHKd/fSZGEPmBWdYwTJdLmVGge4Z + ###erRxxojJqfE4/tQeTzANY+A8Nv9EpjkUVETVF63Px8e5okB05ioJuHLNo9IwZtn35g + ###f4y9x5xsOeG+MHjLs6ZPb0UNdnlrwSadBjnKMxr0ZjHQDbk+hlNLWeqmhJZi8PUsEz + ###OaF4txb5ui1fyTEE30haYJqFtlS5nyw6J5WgUzq0h7ynTgKTQdmFm3tW0ToBExCAEw + ###hY/i6yM8IR0hZsKPDWfFfguxzO/Uhjl2XmaaxKyFIeWZwtIWnyALfEiLLYyukWmhWW + ###+SyRwULJ23LUZWs2PkqX0NOo/YvDjaKyHmaA/jk27EYqVhMhTriDW4qzrvULOQjl3s + ###z8WpCVb0T6XMsYNIThMtNCFQgnPQqpOGqGzku9E6zGJDVlyU2+OxZWE/ZTzX/kC77u + ###gRLXOaQ0IyGU/bfB0wQ/AgfpjwpHSUTqgH76fMyDiWQVrNs5726LGURfHazBkSV8oM + ###/lseCGWd/7BJYOc+t0+AMeP8p7HesOJ/1dc3akX8r5/yFOc/xflPcf5TnP8U5z/F+c + ###9/wPnPgEx2R8d/CWHsn/YuWijc4CkQ/N4dxL5XTqoHYEJQ2pMEAs+HPD9zMYpOjbjR + ###MAzbo940wf9egFwbjwfBf+3914u/S7PczG2ZOcQaIcylrZUdGeVxTX31go9GCNzmOc + ###gmqWh6tHL39OB9NO7vDoegAyZ9obHb7ynyObaRUuYCw2GzV9+9eSLe5MUIaDHc5dd0 + ###7aXnCRgxskiQBfB2dEkGhd1Ph9rhh1N255wVxZMS4F9nB8b5Sd0+22H2Hw4gvJpeh9 + ###2OB+nJ8WHIWva/+7CT8g5n4/2ZJ43GGHbqMImFY7fRn150A3j9JidnJJC8wARlHms+ + ###YYLco1bVLGpzbwL/Q+pnvy9Vzgoup7GQTK67D3GnOhoiJkiG0xVuO5eJgMayl6RBM9 + ###esXKqyVQ9y6R2nbF+7Bt23RItCu96dXl/HY56DFwQ4ceja0dI1xM5BTfqZK9rugDDx + ###msOSewCI8b05ocM7IO8f0gMy9o3HXiQTjsf9qEcmEy29qH7mjKlC42TSBZGUXXwQ2D + ###pTRx7YX/0gQByP5+gfmg4Mu6H/1FV/3p9ZFb6nuA9kLTVjiRnH+VlLK2VJMbISFhmW + ###OIKyK7jHQlkDC7wH3bMRYl6occ+4tfm+HfY6CbsMwg2V1F0gtqjnNZhlwuWW5EvdXK + ###x3Pk/f5SGRh506xMKPVG0EiUkwOcacyN85r3tP8e29KM+gds4bz9aW3KQu6evcxCE3 + ###wAXrE1GeoYvDYvWl2LMgfBR5LtXXheBLsWqBxcWSIuQoaGSIyFHezAKhqPhDHCVTze + ###Ujs5EEqDyJB3GSzIaIVuN8LDaYkyUHIp2ShV1fURjhuWW9H6GYw88hcdTfU520crP0 + ###1nREWzxx6QVYepZDGv/68HAZgLJ3Cgs5PPn0IUQV/uTguCWoKsFzqiE2YotZKPrQS4 + ###94aT+D3e4kOXhog8DpFTmd8nu30WAQ95Kds6N5ih/xC4I56oAwELdAc4tbdGlqB01c + ###cSfsJznqRlh4F/ac+25ncssasHfwN17t77tyNmR/f7L9N9P+PxxPnpD2WT7Z9v/aRq + ###NWs+3/9bXC/v9TnsL+X9j/C/t/Yf8v7P+F/f8/wP4/3/0PvEowQPdpckkBaSgoXaP3 + ###OlqGot44jjqP8Lc/RId2eItmh/E4ekzKv4hgErsxvMNr1fDLaWlQDlhAlGgg6+sVNY + ###mSVf88HMv6UP3/GmVRnfsy9lIaYMPNeW7R6t5gmmp5tUXdbOmK0TNZsBO3odPolKTu + ###uHgVqKVIu9TCrpkAAj4NeF9fBS32gXk22tI01xD9EvdSt/NQkQ1jsxgVohM/iMau+b + ###bAYcW9uC+CUmRGajjW7+Fgn6npX1mjvuA6vj77m/6LXlI2fTLtX1EKU2akbE/UZI6G + ###Cd9yAyfmA0P2t6g3dY1L3UrwVancreg6njwG7du4fWfo3eJOwF+C7UBdtNffHGe92Y + ###KKmvvWZ4oNRbFVAu56iMJAV5+UlHsef3EdYGF6xd2MrnPjH5cgb1HO69UjQ0YlUOTJ + ###Y2nYUOupUKkFKBFZFz+o6lfsC8YjehPgFxg/YCZ4+RK+sXrbWO8r9Ln8JvharToOvf + + + +Valin, et al. Expires February 17, 2012 [Page 229] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###R2mUUSYkC+SjMCDuu2e81nVPdKltgQdbfEV1ZX1mSY1mp+f5ECmVGNPm0OVBuisHbI + ###GgY0NTdH17BIEnR7Be50zNpl0nGU3KEhHqmQFuY4xoNSnCVWqGKsIGgKBLdgOMDVgN + ###7cwd7ZJya3of1ISeN/4cEfNEh8HTnz/hc278f55x2v7Whz+xecfZxfa2IleWCBxqLk + ###8TQSWZxMTFJZjFzmJxkF9XuRifUPf7LsP3eN6DnMP7PsP6sb6+uW/WdtfW2jsP/8jK + ###ew/xT2n8L+U9h/CvtPYf8p7D/Z8T9sOwmGpJ3Eo2A6Cq6ngzbbeaCVb/GYdrfrXsx8 + ###ZwwXFPOik+2domwvXPryW1mWdpwQmdIcktb6JSnFZsCMlDgbS+O2NwQnNp82rozmna + ###NgX6hL0b7W/ZkRMf2xO+5gb7BP93cm/dElc+/F03xyVEGXFeloQ6rcHTNN3IGySLDh + ###IyqMfzftAQNWagCl7uCPWQIfBmxA2tAOfXjj0c3T2rK0Q9YAXpNlzd6Bqjng+uhSMG + ###7jL972d+gNtF81CplaV5b8zw6u+d3OJygC2fJ/E6R+W/7fWK/XCvn/ZzyF/F/I/4X8 + ###X8j/hfxfyP+F/J8//p99uDrFA41QOWdzBcHphHTmDKRfqKeUFGa9cthPDy6Y6crJYA + ###12Hydxcjqd6CH/AkxFoI45R9EjCJcYigeKpsGK2zioFDhsWOfR4CY+0AqJYbWHfdAe + ###kgT4cieaRNz3FU+NHFBCbUiNmyiCYHi8P7sYe2xCgrujnC09sHmqgA4l4pOxX9yyD9 + ###f3l94QenZBFVEx49LN2dHF3nt+6eYFxThhbrysaJlpOb4wMa2YMqYYQV2ww3vDKXrP + ###gkryMmjK494nLkI+Xa14Alozy+ZwNqSbGwmLh8NcDvjqoGNkLHPFrhAF2jHhs/RjxG + ###EHUa97MxACCTvLBoplvSChQb/+xedY0pNEHt2MsuLVmKHjxJHcLBAW8QAI+Qu+ngsE + ###q2UkBJHMZzYyJa5+xXBEwQ6o5t+6k8dgH/icEXVlRitIkb/u7Jf58HD90OKD38J38a + ###S1E37c9MbbkeQKhLAL6EXVl4fTofYWpQc5sD1mskHRDiOGRmKEQBrDAEAQXe5f/BZc + ###96Kb5AkUyCraISEHhxSpjPHkDoaDrBlGABMJ2I8tO0YT/CiUex8ENrBQDAwQHbxltp + ###DDo99wK2xdlFAGOgAGAoLB0a+wD4fQZnjx/hxFwE0MfpPaIzegJYtneXLKQlrKJt94 + ###GxgMWaRWyW7MU/iMojAIvJXB+k1crhXuHhxSNETAkm1I8eGxphlOWKC6WTC3if2SZL + ###j3CcbFYC0v3BO7/a2slt7MGJB6zKF5EY8Ljyj6Moscv6imnFB+WeOw+5DV2eyyafQl + ###wgX66+UfXd1yM5qTexwwv5SkPwQtN7gSl0CCyTgaCC+uOVmGdh34+Cz8FoHSfIXBAE + ###Ghvb42eeRKcnyWzicr7q4eWimC5mFjGsccPQaD+F7tXqAxDyYqVxLfrxdglcpLjdK9 + ###NUgGCsm7sSQ3Xv2WcQskImOUSXj3/m9PxEmw0+kEk+7gUcSXhCFGZJu/7d7ckksSib + ###J0pbgTD9SFY+ovXdSkW+MDkn5TAx1vui5JfIyXM4cIWOjCi1L6eLa3gya0TcbjEuya + ###VczEB9Jcg/j5UlCPq+t2LMO5aeFQXenG5YYBKYHqAWVGhre5KYEJDIegrzPJtqzWBI + ###u3TsIRQjRCsL5UYc5VfGBJN1xs0FvN7pYc5UnGTfWM2jiGk1NQdflU7pzsHP+1ddTS + ###RkN34HkwARn/ddaQhJJhDcwPamGB2ZzjXncQR+PU46USzjeFhC4/RUjX5/38YB922o + ###NDZ+7NWPsLzL1qeb6OSoycsVCRPJZsyjMvGtjY0X500GqF73aOTnRCEdEp7YDL2sDF + ###IK0mFl3aMqqEiOKuxWsYLzxKOcyDw6Pji4NzY4ixHvnYnVdQmZ0Z1RpacDKPh/fBbh + ###c27EmMVvTpoBMB6yYZAUf+lMk83j3XB4hfhT0nfYgyWihVXnT2zLgBPIooM8s/gUYF + ###U2t91IYF38L7cTQapc+cL0Kt9WsCzVhBQ6cgcCYGTgiwGOKnUYfSgXpkDh4DtD/8Fs + ###sdktRzBZTHMUndPrVoypnx82dLI7TbpoQclotNBXYY0LVotuJU2FM+MDtE6XEkKBQ1 + ###ao7vFRFUwhsct6oCD9mttXQxO1sOV10/eOhO5AFJjDY0EA/54klRetlK7x1iIBYz4w + ###HQrbQUai7DmonRVBbG8WQ6xiCwk8UkGU2QJwOMNg/PxtK5Je5sBxQ6naVzTsBx61o/ + ###hKWzkqHDVNg9DVwbFpin4eHgoc2PTIOWm0PlaXj4dNw68OCBLfdS6sBdGvS/J153en + ###2dxBMq5FUQBW/J0gZ0pPI+L4jUQ4xFg0GoBWk/D3HZg0qJxq1WDK7D5eUMjXh7y0dr + ###Z/H4LGrfxRN7sZ7x4SBzS1+uyPLOW++PDi9KaOCfxL2ePsvQ6HKwUUFlxcybcE6dp0 + ###NeeYrA4voHlJ6CnycYjN9GiW1eS7VmmKyHTn8xJsRMJvRdJxNhbJ+dHeTVKzd9x8M1 + ###y9rhPqOjQfj+LERlP/1JJWW1+WhJhGTAe39P7lO6QiLYrCdHTzyR991usG3M1xNrp5 + ###vdJStwkY0QKDGrH+9CGYpd9Uj2QyYgSEHD/IkI3G5ARbzj5MGH2Dl4ZLTZ6LDROU83 + ###tPQ1abPCM4qkPimYmb8bYvM0uuNNh0BdOhKSZ65uaIEwM/phbTdaT7z9sHenHLOSrx + ###+2mf/3TdEVU8x2TgNmUst8i0VtzzaNePGh7+Zz9iMbHyBbhnT1zCFVbz+gOM9KNPPJ + ###4qZuP/BYeTgde/ri7Qcvnqcv8+EDtbM58CHTMM2Pj+x+iMB+LgeR+uKKCv5XD75ohb + ###JSSszJPlCLY1l2up0c0yJD+s1GigcdrCOvXvk68vB76q5vaccrD7/vTq+dkvPvttzD + ###BSvr+tN3cmo/Ht5XbXNI+zFg5gh2Tg2a3Qq8QyfNqNfTgxJekQpIGkSsNAiAi+G0xs + ###EVb9f0dbfNIq5rxn9M9kx0CrGTWoqUlsxfYmZGy9SUlneeyGy0K4Yf6+uzgwhexP1R + ###VjDPbgfWxvWQb7GINP6R5hcEZt+6onfZZ3Rahp5B8jsPO4fLgeo+7RyLzRnSMZ1d4f + + + +Valin, et al. 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Expires February 17, 2012 [Page 239] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###IkOBSzwskKPmU+QJl/Mb9U0cl7cKeg2dFvw4MdQ7FL0NZ2jEXxUepe8rQnj8BHwXbw + ###cBzF3M9/srKEmY+INa4+xp3CQk/R9q1NgWl+HIZKIDe5kROy2WnK+BrRwuKKCdnYCP + ###Nl2VfBY4EA4aXZcMzsNbirUlfeBvENdxCIP2FNgiK48/7Af7vdo7BeDMTX62gYVpJy + ###r0WocnUJrUBRfaTiddVxDbcONX1L4YNyO09ZtYvA2OaSnVcnXKDvKuyFskCDptKdJM + ###mA1YpGGZavOh56vZ8l1BvLSBHFHYG95qHbs76/SvNPLa4NWO5B0JeXdEZv+8xtV/hx + ###vffdX36paCOPEMHwE6PDPJqnSNUWFwJgt65jTnFbociuoy5o5o5fXGC30ZpCr0reak + ###AXTpiLlP4M+n38i8ukVoJ3897hh4bnC+4Qz5DHFhfreiJsKuxk0b38RoEGZ31LJzDl + ###FYhxzYy8xgTfvu7Q3zLam3SetbLsaUm8Wkzt7obbabc67Zf80vf7yYCmJJwMRCQJts + ###uCajPi+1j49es12qzM2fw1iNHhPHOMXBlQLl9kErFJ69AHiE0KlbHBnOxR60kql9qT + ###dlLqGvicftgMmkr2wVS1PeFGEVzWMnlZMZKr7XJyz8Nl327/XHWYizU1Zcxv/XdtXC + ###HdSaFLbctvM1e+ddddgUXSG10xlYWFD0633+773f2jn8/ewPC01pcKChZ/sADDLkbp + ###3JK76Pjny9SeAPN/O39BnyYUkC+MzUzSenr+Cw0p04oMqOY716Fu6WjV4WvZh6FsH8 + ###+eqZtEvfTWxdEx273wwQ4//IBmr0E7G8o0VpU9PmMnonc7HmMI1yvaJOod/Hf8FHuj + ###rPEZqmx9K5modqxbYcn2Zg6cKskLveq9PXtj7jB9U1t5EHG3Awkx+gKk1+A6urrGmL + ###dXFIoxabkq0Lp3lvl6+aN9yeBWsj9hY5YUAOOwCGPCa50Q2/aDQWkmrJepmkZLouyd + ###BrtYKesWbr0TW9XlDNvfRy+I4Hx6b/Z2/AUMxWdKb2vGixjHCMDnmo72BG3Fq04l5Z + ###av0VGINSugtMu+4Vn3BWjb1snEKrQNviSqxY5AJvXL0JIesSSvcYGhmi985giTcmQb + ###pFYBTY/SZA2Gr37ePjzKGaBJVp3twSBlV0TcrIDly2A+RS21d/ZxwQ62yiuxxDal1a + ###bKcRGtTkHmhJMtcdkMEMtDIduJ4WV0qjiRgXTSqQyKRkSHL9DfCrPMKIN0cfyC5tg0 + ###LQXOPtl4xYyXqnNxr3ghGEHGxqE6PBTu6ZQgCGb2VY1ZfPH4K7q04804CaaYtgpW+P + ###MRmHHDcKAH0nG4yeLoAi6elA2SkIo7sjWHHUjYlmcfzP1ZAzq7OyWspMXQPQW6++TQ + ###Gwp078mhNxXojSeH3lKgN58celuB3npy6B0FevvJoW8o0DtPDn1Tgb7x1NDdugJ9Mw + ###09iYZTZ+Fw0gaoLR7O4wn7zGJVSdo+p2lTzl/gk5hGpOhiU+0sQCmOhuBFUnE8ZFGV + ###qmxPU9Pm1Hy2/DQgc0eR8lG9+umfHr8npxiHahxe+GZV+ll6/plGfWL5LKP/F5wEsS + ###OuW4/P5eP5Ex2n+Kd77Oc/KDEHnYV/imMgC85/NF3PvP/ZatXL+D8/5CnPf5TnP8rz + ###H+X5j/L8R3n+ozz/UfD8h0jtdnxw0Ns/M9cujoOZjt4eHvnvyH+2twMWLEZZWXVegF + ###W+7rht8UJC6u1ud/fJyZaG1G61Gm3KtXzkd4GB3R4DzF2jq5RJnFCCcS5R1nQKVjUa + ###VhXUh0cffBt6HfXS8IkqO8HsAA1Og3g4GqwvsjSj39iUQVPC9X0McwU6rqqYn44mMD + ###N2UbJTyW5vsrub2r7URrpv2BONBmxRdrTjwwA9oEumyVqQjtTQpgI/7J0FB5+ixz+u + ###uGfRhljsLTLHcIUzBJPuzWe2PHsGzsx2ruHODJQYZITPRpzDALMG0oETaLC8o8cc/m + ###mcC8NnS4MhGKawin1Ndv+LcRin3eEsICNpgFm8lCuARXHK7QLLI3CO5rcXYFGgocC3 + ###M+zdattHvanyMNrsAAAuR/3ZNQjo9Xg44It384JL9s0W7jCn2254oVSwXBsH4XSKty + ###j73LkMlouU/qr4cTkcA9JV1VtBkn0j/QbCRSpHeFUPQ6ZIJVbC3PZcqxke5tPxHK2/ + ###MRhDgzhFMnQcdWYlGbg6VRS8i1P2KhHL9IYaL7S+bnNdGI3DzbMI72uL91V2XEd3zr + ###P0mkzGxHBGS5bWBCaRN3IDVxFj9s7irz6Yw2omMq9VWSgl+8CkNeHCOinTvf3u2Tbb + ###c3n3HgynqlV/6n6sBMaWhKxwznTBcLr3BDNyCZe/1hI0L1N+sz0WXh4tcU1+caCQ34 + ###aORQ4x9YZQqRj9P8aL5vE4WV1BZ7Lvw/BLOHT6wQitdijZv05vA2QPRqDbg7kIVazJ + ###T2iHwdB1tWEaF1R5fZ2Hzua9VHiYU1O/WawwO7eOW00LgeHMLCJ7dnmzcs10TqL26s + ###Mij4VEp3GV8pc+jn/KwNCv3CX0u6Sq8nSyxiDbOEhhSo8fC3NxE/c6uiSFfBvcwPJz + ###PKqNwisQ+i9h5mCqbVk5vuiONyp9NRYkqi1p/4jyugbfMuJDkp6EAg2vok0ImtlX1T + ###TyOp8Cqk5js80CNCJR9AeeOUMz4V3HzDjCgmpwi45H0uC6oLgNJyJwPIlFRVacPkFl + ###G3JWS8NiVy2wHA8FXQ+wHEsr7jtbcZQBGXjkz24nT2rQLWk5fI9JG9ukztl2k+IBqv + ###wHTbVE/5POFKyXv9NEgcAXn7hSO5or4oo6mu323T/zTPBH72eUz3KPff+PbvbHeNX/ + ###R+z/ddqeuf/XaJfxX3/IU+7/lft/5f5fuf9X7v+V+3/l/l/+/h+zimgHUFnKzmnlLq + ###NngSLwaY3mR7t7B+cNtMPlcsLtbLLF9OamiHy08u1lHjgy6RGSXz/f0GA5HZfBaPEL + ###080G+9ng0ZQ8/h1PltPTXhqne+629QZwwt12i/1sNtlPj/+siwZyZBvsPRIrCW8Lwv + ###nPJiewwX96vCFuixO8sTTh3nnD0wj3mgyZ5zGgnsv+lg3a6LCfHd6wNm9QqyEJdzmh + ###LifU5YS6rmh8y2g8J3yjnjS+wxvJ4TutDv/Je40z1Gnwug3ODG8zgcGZDVYWZ1Tb6G + + + +Valin, et al. 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Expires February 17, 2012 [Page 253] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###WTSbj0rsN+ydyGy0tJLB7KwcyzEqq48OcB5WfWv+W0yzT0aR2QsQrJWmxILYZdmD60 + ###jwOfvtAn1XjA7qm9niVjhzVsNHZeYyrDZ89ySrzaUumgNLU99bz96XwkOji6pEPbwH + ###blaD2DTJL3FzMnKR5UDob9+ZBl4x6Ed2Rw6AMGGo0bsyxZjfqB1peAwRj+vbP9kx5a + ###Ru2ms5qcG5asU7ex0i2rZbOCLmzXWPrI/0Q1mQE8OdT9OFSrVTvnlUwUotvp0TcSOU + ###1m5mU5EZrJmgep3Lt6/ssBkxVDR6vfratUY8fpMFmpWw9xKJbmosW9mI749EAtUOx1 + ###y5nyhNGOll0dRWsU3s34W4WG7GHB2Ye+trzxta7IfxUjlWSPJU4rHQAZ6orMyH6tMl + ###7XHSD1DRzOuuaAt1qaa/PMiCNUqs5RRvkhzbR0RqIqC2qKMXNDb8nHvv/35ofu/7Wa + ###bmr/r94u9/9+xFPu/5X7f+X+X7n/V+7/lft/5f6fvv/Hyx8cftzf80+Ogf+2vTVxrJ + ###itTqwFuicaVK3EbD4CRepPArTu0Cch9+pAJad9IilXSDAIJlzZSq/IJJph7IHgipb/ + ###oFmjfqw7G9IGnuJsALgwX4lEegd3d8miWr46/1RV7GdyBOyzaqxM5tHwYk4AfEa718 + ###FoBFxV3glHwJG8st5PF9JxWe7agxE+jGb3LEYBa77/Jn3pnnsKGop3wHbP/gCXP5tV + ###Z8osePzhpQpRl/jYbYCJrRGVV8Pxlf+uU4X5ZzgL2Kt3nZcZPYKeH3Qt4RXbZ0mH4A + ###HK5/Hu7UjZx+QFa6+hv2U7cWmScglsoxjhkXdTwH5yQpAfnLpxgYSzJ3KdSVgihWx7 + ###RT3cqmKfTMMv7Bj1Gc7ggP/s7yf7/odj0IF7Kdc5UAPj5DKcAuQQ15iAGCyNMY4lc1 + ###ckxdZcdwD+/vZ9V6HsMvZv3vxWxUB5dTokSh4AjfAuDCPDNZzqOREgYRiNPHhTsdC1 + ###ytzgbfSDd7T1J28zi5ZAZ8PlQOaCarZakV/ALKml++S++IinC2J2FTx18drWAPUwq0 + ###U01RO2Kk9r2mDykH0qeavp7YE0cuSMzj8zNt8HmGxwPkfFhcHsdmGePzjw3/yjKvbb + ###NO4ad/OFVMnRhVzTqCC/ELCx9lqqRcAU386u3Zcm97VBmoLE2qM6hWT/pEAznm2Y4o + ###VjR0fyynK0gDeKIszEt2MwsemSDtikg7A/DYOYnND6OK3SemiKZ4/jMUw3VKU/HMcy + ###uIY4n2LZfTTbLUeT9qEK+tJoz7dUT9ByjNUjkqYhrUmi20nQp0UHWNrDCB30kZjNuB + ###biPshFdJE9RmEcDOJquZK1/ZEHTDw43X9XRUmq5otiuoJN8ObMFcZ6CaYtU4nlCog5 + ###NPOlybqfjeN2R60Li5gQZJa2LWikbhhzz6KG996evYH3+wduVe7q2Ts5Z44o3PakNx + ###/SeqGpdA2TqVGw6Rs2vVUQFoiECatY+JV9SiQfDIf3NVrAwiKbHfPSDT6FgcqUrntG + ###LbN+leJVt+qaN7kY961tTnCvKiosCXwRswt2psxnYvSWkXVP7+0FzagtAlRM1D1D1K + ###GR0MQv4XRG/gKyUmK63AEa7Q28/k2auko/MS6OrzzgZKXYPOHJeULBvXC5w0ncHd+C + ###VRA6B2wRsavd3pTFikLrc2jQopomllV2yGYQBSMyxZMqB5Sq28GtEvd5y1lzGs/dpt + ###vahN8SvqSqDMIRsBSqhI1LKGkYbKLjeRXVN5/AfMWEiexvHJbOC0vIX5WgF2QGQi9v + ###JkOWGfdWq1Jo1eJAq/qoMRvFUaqt4ehfsw1D/pc8SMiFYSqutKUDGoNFtkHGkZys01 + ###GRMWY0EcfBK/KNR41g6DrnGOep5r2kCDVKR+GpGP4NSmFJPOlRA6DIgoP+/+AWiDP9 + ###H0+pltxYQ+D4x0v1fTqMVY0vrGQcruSKVQJBUFRjRHhAxEGfaEAKRLgdXJqZe3Ycut + ###yw21bpk1bvL6ygV9VeiaWf4Bwy2uCvh53geMqZh22zoQYCRuXyI50cBifoMDhI3/1e + ###bqSnNqv0NcbO/DK9b8ULHI5IabKtK0u1ROgt21lo+SbLfraFpkyS6T20ZPXr8tXv8y + ###wKbWVVYrX5Ph+w7et32Z37/o99/w9WEONBCKpzEPXD+LExoBbs/7Ubrhn/qd2oN8r9 + ###vx/xlPt/5f5fuf9X7v+V+3/l/l+5/5cfR0i9SbdHFhJYpIOwFo1QwTKFl+zjMafAJL + ###gfjoOBvvumm1fKzhv7MFXP+q5NYsBli6IjgugUe7hlH+LSOiNWFaA6RR+dik+gQjcC + ###zNcxupeDWeCwdDzzqQ19OphN+qGTvId4+lSPOCS/iXOCxZqVi4uzu7tzeprGhbuk1B + ###EBndqmQtRCUP4XIc1xVH2QtZkYVTFs9yG0A2fK3TEG0E4dFOYkBBfxeDiHtQNg5Y1n + ###blfxt17RbWN/RbDMQK9i92SXBf7W9iBZNiqMP07Zp1IFxerwfRwmU3kwRJMEGxddYt + ###0v0Xge85OYwZcgGtKxe+VAcdJdwhdR0dhKW4q//+6QsNZe4zv/EhoVn6tVa2zRu8WC + ###JysLu4Rz6PJ5aXeRaoXqhr9xGUXAOSKHMB1Tn6FtgQYOrC5Hs+g32l2+jMNZ4aVzCg + ###fbx0mYlPDnw/aehT2fNJ4c3kEz2XD1o/6A9lOT4cnODgDNPqPSR5CYJ4r5CddFePEU + ###F5cEOxrrkAXb8V/eGLFKjJMdXnqUsDUbq6rHBceKdOYYQIj7x4Sb7RWrQLCq84zVtf + ###eJ2blXoLLjzB5MHI7RFPONzS+0w8jYf4rQmYfo04NJO8SsNetnpOOQ/SF8S0rD8vuD + ###qQhsSqofLNsIKEsTmMBwI5nRVRWhvWBauQrjn5y3vR1YGoC9ywx50G0X907D6fZ24q + ###XakO5i4bPLb5BsynmODH1i2zD6duJCktaX4Ot8FOHEvZGWbnnPIsQ5H7tWyIZkEF0L + ###jEhdwY9XgrLRhU9F4aVxKzCX9OjJJCJXIZrDo9s7cDgNC9TcC9tgxQxzDxDqZxzMJO + ###Y57GqvRQK9c6eSIxKvX9PMseakAYw+UCS9mIuNcnaGisxHk6B/U2HTaVVMl9UUoOrC + ###Jlqc9GlqWFjJrS05H8KMzN7x6lJ66pr0mCDSUpSvvi2cxXLEWG5JoKR9Mg4doKJDwO + + + +Valin, et al. Expires February 17, 2012 [Page 254] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###a5II6wtmjCIGT7H89MYVRUVIICdwqowrv3sDik/dJtXD+evd/bt2FffxT2rOGn9Wu0 + ###7prCS9TWcgg1VYUyoqxXqbTbWZqqQKYg8KMdH9aKB6d5WoORjeBxI89/5y2jNagxGn + ###E+I27htFKAiqbGEKWZlnFsHgCjKuoklq2BdG7Lg47avFWgPuYO4ZY/GF7KtyxDPbFL + ###RfMUy4Du8lFjgflLH3bjbdlDnZ4miBGlrhGMeID5fc4OJzEAlvEhGmNgsIUysRJivK + ###g5m+nb3YYcZDSjYrCwK4qtm0gsF8hzeq1unkVK/6bY6WkIlg7b5oVYJcPwy2vxA3oO + ###6ipm/ZpxYIDQyDOMqWOKGWSsFyRDTCaSELAVfbQbC2lasx+3sujRr+LhyOyP56PZeD + ###5NjwYDBDp6oVxKnnI0odYoXl9tT74WsSmh7tmJvs5YqvbJ/ikjn+Lx5rRVFlxC4wNp + ###/iSc+sRHayvNWLYpM9aW3cmgDLAQZalopUXIk0asP5lN49SCQLbatFm+Leip7L7CMz + ###rGoF0IAVXEXzLWgnaO+HQU6CE9RhVzTKnlMNfNIaqt3S3zVfa8nbHoTjlUwuQyur2s + ###gaGHFZZftzVVHv3pN9r/pI99/5+f8nuiDOAL8j81G00z/m+z03DL/f8f8ZT7/+X+f7 + ###n/X+7/l/v/5f5/uf+/VB4h9ARMQHXciXtJoIJcb8PBxCNXXmXVqXwJQfmy61URXhSI + ###SY1pNwBWV3kQsV1+lYBOmaKeCpQLBY41s3dyF8OMdhuNuqCOV7ldriYcwtuULEIagw + ###xgUzGyhr9RsJk+3UFNHOm73X9g+JzdCgNfdZ5hwWe8pHpsXIlyiechLsZD0JeBxis9 + ###Aaq6ddTAA+QIuUP7mOp9EI6qmpxml2+Q8TVH0gIvOptsXVAuDPIeu/0fTqdjvIn+ND + ###gW5X/12mb8H/hZxv/5IU9p/5f2f2n/l/Z/af+X9v+/gf0/wgUAXdEDVoKk4AIAXmFy + ###C/2tWCz4fn8ynMf430pIF7Sdv+7+FWzmJEeIBRXe5kYTCmaGOMYzV8zIt5TUsB8dMw + ###Kc/Kduxapj57F4wiJUKCyi82O4TuAX2UADwqQAa5Hb+XAWTYakh926gzMwAE5KDcej + ###K1LXAZvc8LhNKMGYDQVp8g+PTt6fwb8ftruHe9j04wO/hwcsYIjxp+bWXZatNbid0J + ###5Ncg0eydpgN2s9DN4C1Lht/EXevE5hPOgBmjO/9/7kBGQcpC/9AEaPMJ4w+jF2NaHC + ###y/Me/NesU8PbyAIrkpPt3b/tA5LDf+xnYQMkDUICttAYLBY0Nvgx8Ys5Br6BaWrsxN + ###djlnPSguLv3ePtPX/n/YF/dnzs994AglQ7mjywdgyGFh4Tx1aIONgs6aAL3IJ5qx+O + ###7HhE36CO8k9hmrLyq7Wywq+ZD8M7DFYjAmAjwi/BMIKpGo25+vPnz0Fy8hDtHmP3fw + ###Qt4Pf2z85QuSiI2lw8KW3Owf5uJiKShVxEh0c7oDB9AGJD1GEn/M8+PgID1E6BTjBs + ###MJ7tnD4CA9TOwbDJmcVCSjihpg/sYGF2Odru5migmuvWlwfLx/f7tzv7pzjG0SY42u + ###/2JCIA6y7WaGxz8UEaTaQFTisRliGWlFYk2iSO+1uKmw3c208aSKoL+oIiwYDJsPv3 + ###hG+goLhSYaOctEp412dxuynsTnBHYXcCfh4X1FDTubifhWklg0iFBsDRD9bKz7aR6X + ###HdKZBeBzEe+mUMzAebMwkBWG9ZsIJFFHuZNKMNbMM6535LnHHs5x+9YP4Xe+z+nxne + ###//hB/h+3DePf9P+0G6X/54c8pf+n9P+U/p/S/1P6f0r/z7+V/+cMxSPl/5Fvzb1fVo + ###g2h/UP7CI0i9pc3GcEWmg2Bb0rbg4ygwutZ15B2dJlN3xTN+camIDtyO8CS2Ex9e7n + ###beiHF84GRtrKfwA7LC4WojLumLGrxSzYJeJit2KcmoPBE1Ov11mkMEDVpFXsAlz6Wf + ###dzuiNUcU4Oz3bf+Ps9dvemu/2z/xYT+CivAR9/vUrtBnwNb3HTzEsRgNBdzDeTiVip + ###ICr1nDn0XHMpZIiqUaDDdFRHOxybu0TTEJW7dKvcun8bC2xeQWyEqnBf6ahk2xqFkC + ###EqKFpADOfDOIzpxPzFcNy/4ViOyPnFRxqOOhTHk/ddnMzXHb3BgMvdqBdololqB/S9 + ###/65lYquxZI02jIiq7RVoFrr//GH4JRzGcnx9siLKZCb11sbiZqmoZIuWw5agWoDrNr + ###gTbCT1ee4sN66EZDQL4Iqvw+HQpytChKsOkt4qKuqJZLQKCLyJyv1xqLwfh6rx41Dx + ###UAaxMYoWinungFwM44tkSC0neyoup8gwxosYQu+1H4aNppJ2AVz8ikVjKT1raVdjcX + ###dptzkeMIYddRgXQtXiqFoPRdUqjKrNUT2kvwhVuzCqDY6qgAVoR1VE52p3rc+dzkNx + ###FRlb6ctrSwtiARlc4+8yL6SBsYGvd3f+1stD/mBUfJpcAlseKp7BVUdxGw0GoAeDL1 + ###f+6Z7/zm2+tNcEGtNEfvmVSPPfdQrzghPptjMsBo5KRYFbIsWZncWPxRKVXK57hFbL + ###UDUG73uIitsmyHSGcBGNtpg+S2rFouowI87PMnNZ7uSl8iPG1MBjnwJvUIwf4AjYAL + ###2z/dP9Yx5hARbfbHfIjp0mryLzv4Lq8xg+iFYV1/e0uiug5Tmq8Wh4zwwOGGlL8rDI + ###9K+PSRlbS2qpwtjIrqkX1fOZoSIKTZ3JTKnjSuDv7nDvif7ul52XS9YArfEWKq3oR8 + ###/5OffbYDJh27jjW9ypnLK8x87NxSRGfzD3wIhUO/BlsOP0jk4zxzhmkWZ50YPpVTg7 + ###xSUPG+RHO+eOc4b7sWdstUMS/Q8c9UtCevtkkH5ZEpIcscACqbvOZa/aISHn37G4ae + ###IqBJnci/WkWstncb8waVGdrxo9Af1Qi6kywWEdU7IbW0JjcvXzXRY8LfI1GuA2Q5KJ + ###WM1KsYCfSX7h7omfzh0uUi5/SmUUX9hTGuR09vEMyNuCI6cgztQ/PDHcOEYvJkURyO + ###U7UyK9g91xfBZcUKj6dy6s/GgsHfd4r+J7vkgq9+X/hR/7/j9zugWjYHgfRzFMbdPw + ###EXfBc/f/3Xq7Uzfjv3ea9U65//8jnnL/v9z/L/f/y/3/cv+/3P//N9j/X+7+92Mmxx + + + +Valin, et al. Expires February 17, 2012 [Page 255] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###Vci2J0QmZFgSq7nI/6qN4e0SI6Xpt7Kd34ygy5MJ7xAwyxpcwgvJhfsfML4ijELqzv + ###dt/Io7qe9zhesBPc4tT48J7pYsGPnFTR7Mk/410EexJ6H1Zao8DvB8M+WrUYab9RMe + ###+/86c/HcexLHXunOz7WpjOT/QK/kRvpd87A2ltUJ45+YG/627/3HM+VYEFleNVpwG6 + ###6K2DYEO+mg2m00DmdbStkzEAl5Jw2+JpOXS+UPxb5tBgoJPQ/JlB8tH2neG5iyzYBB + ###oDZfJY6AA+DoMpivV0PB8NckBf8mRY+aDZ/SCYvAOnhVdqZAzuHKpFcLp8hoxkivAk + ###dvNChvSTayw5oC2XXVTQGAnBKnHhKJxe3efJHJWIwvg7SBxD/uTCBu0SoMECzOPtn0 + ###jYxqDkdHH7pxY2MzAIEzlQ5QOfBzusZHT3GuvvquUz8ZW+Ct5mFZrf+vGvUyxF1Dxu + ###SUlTBT0wo4GFcHIMdg/YLGAX0sEvsDW2u3/vgVVx8P5oF20hjWWPnSuUMCtOliukov + ###TPMf78MI762C88R3X4k1N3QAH0cZXiOvMR+93axZkDUfRMSh7gYeEaUdq4SMPgZ5dr + ###uvtHP5+98d/21g60RKmLhXGNNRSWOFpCFmpfMwm0LByMRR8DH7aMf0hSoKTwdQEPj5 + ###i77GPg20g+qLFiqzo+ZqjxAsthzuZn9+xkF20Hyt0r8VEynSNMFzSMfsP0zokd8JLF + ###/vmJR4Jl6YP03Cw5+HisXau8dIN4xhWrAfGlwxXtb+F0jPd4TWG1yif5sEkz+7PraR + ###hjmuV2VUmqw9JpYLYJhwpcj4cD8tYjEf0ArGtMiB7DMMGDYBZ+WrSMgo8nRFbwUQaX + ###5TAtwHfAoyrb+EnXkUPlYmAFiq4ukJQF+JLJIJ0QKT0FVJ16zas6X6/Daeh42HHX0d + ###U16J/C+GT0eUv7ktlMmySLjPq1dI4k2nOgeWQD2CStGk1h9c58T0trpNVr5tVzzXog + ###nbgpxJJosaM35ve4Pw1Q292Gt7grv2aDbSFnjQaoz6mazKapPE8sGRSo/c+pyrtWe6 + ###4iXoLJJvJbrNP2qn1eWJvRBh8irzprFwHOSSlCoIXJ4oUcZUzdwO/MVKs68XV0ORN/ + ###+gRH/sVQpHNY+TGMQGrFnt87hfWhYFTV2b0NQKmy2chnBZU/UbZT/GCvF3JA7bX5bT + ###UZ5fBreDtpwCjAc+MUMjxMd8juTkSksZ/+KPwqfycYZI4qlims/NkvCBRKp4jY3U0b + ###4R4eiSI2MD7QD/9C/AJgtD9SMHWr/7Fmv10Wnmwdm2Kxmvm4qv1FA9541aRXyAlmN/ + ###L3KaiKSS9/5fCSvxFYquZtNGJdyH/htcRf9jpAD6vDfhF1+F/pOshWfib9Igpi/x0G + ###hxhEl5dVil03pPGVQgNKt39x47O5rOrQ7zAuU6BlxgOKE0jWNQa5ky/wDz7h6y+oDi + ###MIZ0jqdBox+LdNpWyAoQJVdncSLYKRCa7D/g1NoxSTIOMuPBbWktUzk3Nry9nAXGfJ + ###n65n/N1WowWayPrpBY8FmVLq9Ra7vIOCfXgkokjYMvUolV4plbY/qpVStVKmDmKkJH + ###jpLwC24r565bZXbfhTRowVEvsiILVWVWb1wtl8wq1BNghilFLnBco3GT2XfFsku8+0 + ###VOX0bDEtjEfv3u6/TVYRoIilnUCTJGkM5TumpGD9+jIFmkbN40A3LVA3Hg11g2eHut + ###R4QGyw1NAbqOuenEpNs/xGfnlOFNdSikVF5ZWbTjo9qlbLKt/Ui27kFBVUML2XoiK5 + ###hiWoQLNaq5OiRK3T1IualKhFNxhkOYTAVANtUHF2wfStUgSN8WVFtSewZ5W+r2QZFt + ###pwOg1jYcvDaovFXmVvBk4wE22E9dGGg78oSZx0baYkZVCJTexQohqvtZmUg7ZfVZM8 + ###sGs0nKypPxh/HXk6IMWYFn/oc6yRxim6dCq6Mi5IbvuB5PqNxxGsE2ebXRQCOP39yX + ###1lMSImcbJVShIca0IvcuY4wRXt2I+dpioDD+tmpsEdlt9XLLs5xMI931TaZzOxqJGK + ###kHfHX2sTYKM4KyemAZGDLq20ayyr4WtKT1eraQKjrclY3kLkxfYexsA5c9uVVImq+Y + ###blgS2UsfDBDwFdA3ZTmGPWdTzVK3IWmY8GE8uSKX0wMJmGQTyHXmAaYfwlnF6ysw4C + ###ILpVZQ6ZgM2+4k+ce8Ogf+1gF1T+z6pcOvPKT/q8kB18OIIFhDjFgM4A9MrPhxRZjE + ###5YoGEaTrGt3GaALhnzCNDCXvg6RqdNP4ilMzxlpPOuxvcNEE3TLlejOOvzJI4JOcTI + ###NAZQWa5qXcyLLB4EZNTLDLqZwMzMt5iCms60mCPrIgGXRdAJeyot1veRcSZUzsHhae + ###/MoTVaFfRNOGWZrEFngdRf//YdRI+JR+KJALY803ixSBI+KVkwleRTcvrG2Tqdekqu + ###FehE1tfQEedyoKlTTBGEHis616TucZnziEL26y21C81ZxVJh3bTnXukQ1i26VM22Jf + ###010GYFbM1YnD5xixOsxRqclH9sexPPk56JKvFO6e+xvUJ1gaJFhcS3GuURrYsQpAbW + ###PuPxRG2vBpE0S4RK0cd6PpBwNQoHaldWk1aaDgaVLVoDMsEqoB4AVpk9Uauq3joW/P + ###59d2cnrW2bGOxyVWM3c4hxkHuHHxCc6ghkB0benZ752ycnp8cfVWRkHGspBHcpn9u5 + ###vsTQ8ruB3UQUsmmfY1+VF0PwUgC7bKK8OcBpdTT+6oxHKnactGBxPscpaxr259M4+h + ###IONZEmbYGJwjSC1lFTDFAwNWeNM7Coc9k3tZrCtccNtIcMtu834L7DUDD5tD0YOPKA + ###JU97MQq/8mUTnRGdhrfsYKlSiplTwwHuUfCiBhcVaVjf0r4IfomhIOmllMxV42/o9l + ###rR6kZzdVjmxxQ3nna84SPG3GCpgWY+cuCJF9/UEfh+MqDVBwkAu0qTLAqoWcqEt2Vw + ###wVwl7Y5vL/DIGKWXl/tEABL+BCtkGGonnbhxTUISTCYwvinKbQ19Dei1VBfYanpk02 + ###VtNe308R/h+NOm1dRKBh+wI1VGN7zVXRIiZu6tm19c/iXF+hTLhdCJMa7ZjbiRge6I + ###LSY6vF+tRVZNEWEU28oueTP6Xc1dRLCw4VQu1CKYe6y055XOaYbI7kLNoH9UYBJA1p + + + +Valin, et al. Expires February 17, 2012 [Page 256] + +Internet-Draft Interactive Audio Codec August 2011 + + + ###3QBc0gPBqp+CZFjtrr+sCD4ktdvTXo+Wb3bODRg1Gm/OPzHeX6x/XE92Zr4hfnwbLx + ###T20bUjGwWENQSTer2n67VMOq4OC2sA7p1VZ671Osadk0izXxQl8M1GAG0ynoO9CCrM + ###kV55lgh25SVR2xY6r5UGspQ8fYYVV9PPuwep6Qr0/Vt2BVUQ6qIdhbwRCoGdw7dGSg + ###2BIubXqyJZxUzXIlx08AFrQ31N8LOg0kAsNaFvvZLlnDxYJBJYoad2RVuVy1d1BBsI + ###mEJkdRtjRG8u1hxFpMWxNYz1F8PXgWBI1TMEzxy2B8i95JZd5UZwbBnSZFjVp1XiuU + ###ZTmBlXNg9arqUTddmroSVc87OfqqTh71or/0T0YGb+UTTw3mahaHjbGksdKnkTiXdV + ###cnd/9owyjt+lHSsUnXP09WnGyvwRDXz2+xtQML6x1TmYRaRXNhH1nFbJ20ZFYX4SNO + ###YCSeKDFy1C/rGlgjL7w1h7SpMCN9grgAxXFjTyOtKkwdCnnguH5KpjJ1C6rmtFhvaN + ###tB6/TW6BBxVoQ1vP5SoWDJrhWQVIYhTDdt2I6+jIdzNVldakbmBDeMWXnDOiurbQCz + ###OvmTecPXtTfyMBQnyOyh+stsxlqZ6qZZgYKY4KS73im/qSp1Og2f0nKiFVhfz3SC/v + ###G8Nd40sriNRR7C7eYibmdxmn3X8ROnke4MbmOhHG4/+SN3VvZ3j4/20o5nUIKkMqvo + ###4kHLNg75PR/ai8CDiqra/B5bI+x58R297mJjydhSCujex1IbSk/6vBBDrNAulXn7oe + ###jOTMaeY5bH84HbMhuLtmU28rdl5OcfvC2zluzMYCdwy3V8afAczGO8oQ42BJpATjTD + ###M7zxbDwFew17KEgcjwMQpvv4+wyU9G42O2FhulxyTlTQ0QvriQxhAFjXGfI0cPoUzx + ###pFscvdI0q2h37E/pDpwF9+f2jD4r5NuVi1A7gPWU1lbzm8eOGcjffGPykbLK7zwsBI + ###a0N0zsXBl5BuSQ2iL1FMS8lRHA1CZxTezdj5+vF4oo/jz6yTPqtGGJ38dT5bxjBa8G + ###K++2y6JDL3yQY/1G9v8jC7zmM7Hh/Fb+886SaWIllU/km3svBBBa9QbzNtEhqSQwQV + ###Xfr00+i4QH7BVShOXqAib4MbmHDRf8y2BqVsvnLc5ynnKz7D30Rbd7v/0L3zZhuouJ + ###gAaWmFV/rpnMOQDsSQVoS1raWebR9AXZ2pewIcx2rVulAH+DVZhG8QkBPAbdnap6kh + ###ToTm6xRbBQupFgtpldRknwEpqNRcILrfp5kAfrzAbqlcQDH07lqI0+ArLhtxbF/Zxi + ###D4dSuUVBfKak/WfbpcRqNFcpkCoO/aZAiBvK3wAAF4gQKgobWu49O01HVik32g5Ldl + ###dnv4dVw0YsmyZyoWJwyMR0hhbi7G4xsnsUP5GSOKHZjcy+LlqmiZBjIQAEWbCWk3Ck + ###sJ+53uTTgO5yw5s/HQ6svko3+R/si+0k0PNi8BMWfCQGe+JbSF5yMW82CgXm4UfmR4 + ###s+XUXB5sHWr3aa6JLukTrWbi2XSMNz9H47m+rGGJ0TDZ4qW4uyyNYX50P6UojXOlXk + ###qLioqKkPnm7ou8COiijDUszp/c46tpNKcWwKYlrdQSFxLEsIWVgwev9G0hgSHr4Gca + ###lub0yT9Tb2z3pL5LbSjP07Oril4iwDDUyTC3Xux+wCaluOnh8KPO6etDCUeT+xjMWE + ###bVt+NTwE+i0+POw7pqNel9uoFXCtQbEvYLEka340nCS34IGhTdBp4eozhcAcj79Iqi + ###LHL+kKF4EfYDCtNFxYeBvPNpbuyrt14Wt9+q2hbCsEmkfv3FEGdtgyN9udQiNiD5jU + ###yJVXrYyehlt/62Z+1mVsHW1Szhha3DdYYUwPf0zGgaR3jNpZrhijWP87EVAPMt3qhN + ###M1cTWlPtqwm8lffZNuOZHoZk+WhzLPBRcDa9x0ycUtxjm2GSoBS/pU4LRGwiXsfIZ9 + ###PoDvu6ovR7Fa+Lfk6ugTmrnxZP18ImvsCDNOaEy+ji1wztEyYVkZchdYZZmKUy3sYx + ###2s3YFS7NBLeNsyplvI7FllJpi7L5oTJkB7fOZ+OvwXQQsx11ZkJo/TYsODUNhMHbyf + ###IQaJC0uUb9sprlL1C21EgrYwRWjDR2Ru4VSuaMt2B2Drd7zGI1kCxfXyNFuZNK/SC4 + ###XctUCEsjrOqMqDodfRmT2XcyOAG3/5Zn38np/odHcM9SXWNenvWGj/XiJrBZ5UfNtG + ###6yHQwZ4LQG2cukVnxZlGV1esYV1AxsrItTRqR2HTUH2bKdUtW3m1f5yi5jpZxFibJI + ###Azoqtgu0mc21f4AZAKzjV6+ctuWEkTLualtpZDbqFTVHt7hUGK/l2qfwA0ah4lKhhN + ###OI3djGTj3m5JfojNemVVGcil0F44jtmI8xTCdtD/HlFHvDA5KYVGQbxsoU8okOBqcu + ###PrJrUTCGKSjqBZ2mYGvZvMegIG2DiKWo0k0WGXActYixqccvXW6hp1OryVayWFO2Lm + ###M7A3UULV1x7WqeazjCY5oRixsuw6MkS1RR8p/mQIiy7nmNFwP1/YAnfRIaxeYfvy/6 + ###yC1ABvJJnxdqlz9oKxCfgtuBVSMCRHKv2pg47XuAnMq3eGKcsxIPD7MILcC6W7nORD + ###++xnIw9ebDAQX3HfWvcfym1ATd8RWVGx6lqldhs+slVb7MddtUQJyJvhR3FQygZhgY + ###/Wjj2qoSXiZ/NaIyLntFYqLL3vPM2u5kA0b+ZltgL2wTfbGtsp9++1S3EHtsiQsqej + ###yNrijUE+9/tWAS1EXqyJcqFDw3F45ipu2mMH/T7V7lBAo+hpWftu7T1mCuv26YcqKp + ###Vg8FHGmQ9fIQL10CXLj+hmnvnPW4l6xoUqJ274oFD/nUQSB4jSTSCo8XoF4MFzF1lE + ###ujoiYeZpG11Uo8+o4jnL1YRFZap0ppTDxSD1WC34ueq5SqWncBqytpPueyKaoI2MKg + ###sw7a8wBC6GdioUGyJlT10Gr6mkkWSGYiH89nqERH1ih0+qDiB2Qz/AgASwYGjJ2gD2 + ###BYNmMM3Ilx49P+wMXb+SovpelBHiLWv3SUdc1u/t0o5h9qgk92faXsgeO0oM3VgTiy + ###EcF8jYYpSyXDGtLQpseseMKOHnGpmtKtWsQpJdBREmtU8d2awRbs8WS1GFKPx6gNLh + + + +Valin, et al. 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Expires February 17, 2012 [Page 260] + +Internet-Draft Interactive Audio Codec August 2011 + + +Appendix B. opus_compare.c + + + + #include + #include + #include + #include + + #define OPUS_PI (3.14159265F) + + #define OPUS_MIN(_x,_y) ((_x)<(_y)?(_x):(_y)) + #define OPUS_MAX(_x,_y) ((_x)>(_y)?(_x):(_y)) + #define OPUS_CLAMP(_a,_b,_c) OPUS_MAX(_a,OPUS_MIN(_b,_c)) + #define OPUS_COSF(_x) ((float)cos(_x)) + #define OPUS_SINF(_x) ((float)sin(_x)) + #define OPUS_SQRTF(_x) ((float)sqrt(_x)) + #define OPUS_LOG10F(_x) ((float)log10(_x)) + + static void *check_alloc(void *_ptr){ + if(_ptr==NULL){ + fprintf(stderr,"Out of memory.\n"); + exit(EXIT_FAILURE); + } + return _ptr; + } + + static void *opus_malloc(size_t _size){ + return check_alloc(malloc(_size)); + } + + static void *opus_realloc(void *_ptr,size_t _size){ + return check_alloc(realloc(_ptr,_size)); + } + + static size_t read_pcm16(float **_samples,FILE *_fin, + int _nchannels){ + unsigned char buf[1024]; + float *samples; + size_t nsamples; + size_t csamples; + size_t xi; + size_t nread; + samples=NULL; + nsamples=csamples=0; + for(;;){ + nread=fread(buf,2*_nchannels,1024/(2*_nchannels),_fin); + if(nread<=0)break; + + + +Valin, et al. Expires February 17, 2012 [Page 261] + +Internet-Draft Interactive Audio Codec August 2011 + + + if(nsamples+nread>csamples){ + do csamples=csamples<<1|1; + while(nsamples+nread>csamples); + samples=(float *)opus_realloc(samples, + _nchannels*csamples*sizeof(*samples)); + } + for(xi=0;xi=_window_sz)ti-=_window_sz; + } + p+=OPUS_SQRTF(re*re+im*im); + } + p*=(1.0F/_nchannels); + e2+=p*p; + } + _out[xi*_nbands+bi]=e2/(_bands[bi+1]-_bands[bi])+1; + } + } + free(window); + } + + static int cmp_float(const void *_a,const void *_b){ + float a; + float b; + a=*(const float *)_a; + b=*(const float *)_b; + return (a>b)-(a>1) + + int main(int _argc,const char **_argv){ + FILE *fin1; + FILE *fin2; + float *x; + float *y; + float *xb; + float *eb; + float *nmr; + float thresh; + float mismatch; + float err; + float nmr_sum; + size_t weight; + size_t xlength; + size_t ylength; + size_t nframes; + size_t xi; + int bi; + int nchannels; + if(_argc<3||_argc>4){ + fprintf(stderr,"Usage: %s [-s] \n", + _argv[0]); + return EXIT_FAILURE; + } + nchannels=1; + if(strcmp(_argv[1],"-s")==0)nchannels=2; + fin1=fopen(_argv[nchannels],"rb"); + + + +Valin, et al. Expires February 17, 2012 [Page 264] + +Internet-Draft Interactive Audio Codec August 2011 + + + if(fin1==NULL){ + fprintf(stderr,"Error opening '%s'.\n",_argv[nchannels]); + return EXIT_FAILURE; + } + fin2=fopen(_argv[nchannels+1],"rb"); + if(fin2==NULL){ + fprintf(stderr,"Error opening '%s'.\n",_argv[nchannels+1]); + fclose(fin1); + return EXIT_FAILURE; + } + /*Read in the data and allocate scratch space.*/ + xlength=read_pcm16(&x,fin1,nchannels); + fclose(fin1); + ylength=read_pcm16(&y,fin2,nchannels); + fclose(fin2); + if(xlength!=ylength){ + fprintf(stderr,"Sample counts do not match (%lu!=%lu).\n", + (unsigned long)xlength,(unsigned long)ylength); + return EXIT_FAILURE; + } + if(xlength0;) + xb[xi*NBANDS+bi]+=0.03F*xb[xi*NBANDS+bi+1]; + if(xi>0){ + /*Temporal masking: 5 dB/5ms slope.*/ + for(bi=0;bithresh){ + mismatch+=NMR_THRESH[bi]/nmr[xi*NBANDS+bi]; + weight++; + } + } + } + free(nmr); + free(eb); + printf("Average pseudo-NMR: %3.2f dB\n",nmr_sum/(nframes*NBANDS)); + if(weight<=0){ + err=-100; + printf("Mismatch level: below noise floor\n"); + } + else{ + err=10*OPUS_LOG10F(mismatch/weight); + printf("Weighted mismatch: %3.2f dB\n",err); + } + printf("\n"); + if(err<0){ + printf("**Decoder PASSES test (mismatch < 0 dB)\n"); + return EXIT_SUCCESS; + } + printf("**Decoder FAILS test (mismatch >= 0 dB)\n"); + return EXIT_FAILURE; + } + + + +Valin, et al. Expires February 17, 2012 [Page 266] + +Internet-Draft Interactive Audio Codec August 2011 + + +Appendix C. Self-Delimiting Framing + + To use the internal framing described in Section 3, the decoder must + know the total length of the Opus packet, in bytes. This section + describes a simple variation of that framing which can be used when + the total length of the packet is not known. Nothing in the encoding + of the packet itself allows a decoder to distinguish between the + regular, undelimited framing and the self-delimiting framing + described in this appendix. Which one is used and where must be + established by context at the transport layer. It is RECOMMENDED + that a transport layer choose exactly one framing scheme, rather than + allowing an encoder to signal which one it wants to use. + + For example, although a regular Opus stream does not support more + than two channels, a multi-channel Opus stream may be formed from + several one- and two-channel streams. To pack an Opus packets from + each of these streams together in a single packet at the transport + layer, one could use the self-delimiting framing for all but the last + stream, and then the regular, undelimited framing for the last one. + Reverting to the undelimited framing for the last stream saves + overhead (because the total size of the transport-layer packet will + still be known), and ensures that a "multi-channel" stream which only + has a single Opus stream uses the same framing as a regular Opus + stream does. This avoids the need for signaling to distinguish these + two cases. + + The self-delimiting framing is identical to the regular, undelimited + framing from Section 3, except that each Opus packet contains one + extra length field, encoded using the same one- or two-byte scheme + from Section 3.2.1. This extra length immediately precedes the + compressed data of the first Opus frame in the packet, and is + interpreted in the various modes as follows: + + o Code 0 packets: It is the length of the single Opus frame (see + Figure 15). + + o Code 1 packets: It is the length used for both of the Opus frames + (see Figure 16). + + o Code 2 packets: It is the length of the second Opus frame (see + Figure 17). + + o CBR Code 3 packets: It is the length used for all of the Opus + frames (see Figure 18). + + o VBR Code 3 packets: It is the length of the last Opus frame (see + Figure 19). + + + + +Valin, et al. Expires February 17, 2012 [Page 267] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |0|0|s| config | N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 1 (N1 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 15: A Self-Delimited Code 0 Packet + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|0|s| config | N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 2 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+ + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 16: A Self-Delimited Code 1 Packet + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |0|1|s| config | N1 (1-2 bytes): N2 (1-2 bytes : | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 2 (N2 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 17: A Self-Delimited Code 2 Packet + + + + + + +Valin, et al. Expires February 17, 2012 [Page 268] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|s| config | M |p|0| Pad len (Opt) : N1 (1-2 bytes): + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 1 (N1 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 2 (N1 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : ... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame M (N1 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : Opus Padding (Optional)... | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 18: A Self-Delimited CBR Code 3 Packet + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 269] + +Internet-Draft Interactive Audio Codec August 2011 + + + 0 1 2 3 + 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + |1|1|s| config | M |p|1| Padding length (Optional) : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : N1 (1-2 bytes): ... : N[M-1] | N[M] : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 1 (N1 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 2 (N2 bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : ... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame M (N[M] bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : Opus Padding (Optional)... | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 19: A Self-Delimited VBR Code 3 Packet + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 270] + +Internet-Draft Interactive Audio Codec August 2011 + + +Authors' Addresses + + Jean-Marc Valin + Octasic Inc. + 4101, Molson Street + Montreal, Quebec + Canada + + Phone: +1 514 282-8858 + Email: jmvalin@jmvalin.ca + + + Koen Vos + Skype Technologies S.A. + Stadsgarden 6 + Stockholm, 11645 + SE + + Phone: +46 855 921 989 + Email: koen.vos@skype.net + + + Timothy Terriberry + Mozilla Corporation + 650 Castro Street + Mountain View, CA 94041 + USA + + Phone: +1 650 903-0800 + Email: tterriberry@mozilla.com + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires February 17, 2012 [Page 271] + diff --git a/opus.spec b/opus.spec new file mode 100644 index 0000000..60a8404 --- /dev/null +++ b/opus.spec @@ -0,0 +1,60 @@ +Name: opus +Version: 0.9.6 +Release: 1%{?dist} +Summary: An audio codec for use in low-delay speech and audio communication + +Group: System Environment/Libraries +License: BSD +URL: http://www.opus-codec.org/ +Source0: http://downloads.xiph.org/releases/%{name}/%{name}-%{version}.tar.gz +# This is the current IETF Working Group draft +Source1: http://tools.ietf.org/id/draft-ietf-codec-opus-08.txt +#Source1: draft-ietf-codec-opus-08.txt + +%description +The Opus codec is designed for interactive speech and audio transmission over +the Internet. It is designed by the IETF Codec Working Group and incorporates +technology from Skype's SILK codec and Xiph.Org's CELT codec. + +%package devel +Summary: Development package for opus +Group: Development/Libraries +Requires: libogg-devel +Requires: opus = %{version}-%{release} + +%description devel +Files for development with opus. + +%prep +%setup -q +cp %{SOURCE1} . + +%build +%configure + +make %{?_smp_mflags} + +%install +make install DESTDIR=%{buildroot} + +# Remove libtool archives and static libs +find %{buildroot} -name '*.la' -exec rm -f {} ';' +find %{buildroot} -name '*.a' -exec rm -f {} ';' + +%post -p /sbin/ldconfig + +%postun -p /sbin/ldconfig + +%files +%defattr(-,root,root,-) +%doc COPYING README TODO draft-ietf-codec-opus-08.txt +%{_libdir}/libopus.so.* + +%files devel +%defattr(-,root,root,-) +%{_includedir}/opus +%{_libdir}/libopus.so + +%changelog +* Mon Oct 10 2011 Peter Robinson 0.9.6-1 +- Initial packaging diff --git a/sources b/sources index e69de29..7a69182 100644 --- a/sources +++ b/sources @@ -0,0 +1 @@ +030556bcaebb241505f8577e92abe6d4 opus-0.9.6.tar.gz