From 483e27ae47a6776219e85523fa411e08142e0947 Mon Sep 17 00:00:00 2001 From: Peter Robinson Date: Sun, 27 May 2012 20:50:21 +0100 Subject: [PATCH] 0.9.14 --- draft-ietf-codec-opus-14.txt | 18536 +++++++++++++++++++++++++++++++++ opus.spec | 9 +- sources | 2 +- 3 files changed, 18543 insertions(+), 4 deletions(-) create mode 100644 draft-ietf-codec-opus-14.txt diff --git a/draft-ietf-codec-opus-14.txt b/draft-ietf-codec-opus-14.txt new file mode 100644 index 0000000..92d97b2 --- /dev/null +++ b/draft-ietf-codec-opus-14.txt @@ -0,0 +1,18536 @@ + + + +Network Working Group JM. Valin +Internet-Draft Mozilla Corporation +Intended status: Standards Track K. Vos +Expires: November 18, 2012 Skype Technologies S.A. + T. Terriberry + Mozilla Corporation + May 17, 2012 + + + Definition of the Opus Audio Codec + draft-ietf-codec-opus-14 + +Abstract + + This document defines the Opus interactive speech and audio codec. + Opus is designed to handle a wide range of interactive audio + applications, including Voice over IP, videoconferencing, in-game + chat, and even live, distributed music performances. It scales from + low bitrate narrowband speech at 6 kb/s to very high quality stereo + music at 510 kb/s. Opus uses both linear prediction (LP) and the + Modified Discrete Cosine Transform (MDCT) to achieve good compression + of both speech and music. + +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 November 18, 2012. + +Copyright Notice + + Copyright (c) 2012 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 + + + +Valin, et al. Expires November 18, 2012 [Page 1] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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. + + +Table of Contents + + 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5 + 1.1. Notation and Conventions . . . . . . . . . . . . . . . . 6 + 2. Opus Codec Overview . . . . . . . . . . . . . . . . . . . . . 9 + 2.1. Control Parameters . . . . . . . . . . . . . . . . . . . 11 + 2.1.1. Bitrate . . . . . . . . . . . . . . . . . . . . . . . 11 + 2.1.2. Number of Channels (Mono/Stereo) . . . . . . . . . . 12 + 2.1.3. Audio Bandwidth . . . . . . . . . . . . . . . . . . . 12 + 2.1.4. Frame Duration . . . . . . . . . . . . . . . . . . . 12 + 2.1.5. Complexity . . . . . . . . . . . . . . . . . . . . . 12 + 2.1.6. Packet Loss Resilience . . . . . . . . . . . . . . . 13 + 2.1.7. Forward Error Correction (FEC) . . . . . . . . . . . 13 + 2.1.8. Constant/Variable Bitrate . . . . . . . . . . . . . . 13 + 2.1.9. Discontinuous Transmission (DTX) . . . . . . . . . . 14 + 3. Internal Framing . . . . . . . . . . . . . . . . . . . . . . 15 + 3.1. The TOC Byte . . . . . . . . . . . . . . . . . . . . . . 15 + 3.2. Frame Packing . . . . . . . . . . . . . . . . . . . . . . 17 + 3.2.1. Frame Length Coding . . . . . . . . . . . . . . . . . 17 + 3.2.2. Code 0: One Frame in the Packet . . . . . . . . . . . 18 + 3.2.3. Code 1: Two Frames in the Packet, Each with Equal + Compressed Size . . . . . . . . . . . . . . . . . . . 18 + 3.2.4. Code 2: Two Frames in the Packet, with Different + Compressed Sizes . . . . . . . . . . . . . . . . . . 19 + 3.2.5. Code 3: A Signaled Number of Frames in the Packet . . 19 + 3.3. Examples . . . . . . . . . . . . . . . . . . . . . . . . 22 + 3.4. Receiving Malformed Packets . . . . . . . . . . . . . . . 23 + 4. Opus Decoder . . . . . . . . . . . . . . . . . . . . . . . . 25 + 4.1. Range Decoder . . . . . . . . . . . . . . . . . . . . . . 25 + 4.1.1. Range Decoder Initialization . . . . . . . . . . . . 26 + 4.1.2. Decoding Symbols . . . . . . . . . . . . . . . . . . 27 + 4.1.3. Alternate Decoding Methods . . . . . . . . . . . . . 29 + 4.1.4. Decoding Raw Bits . . . . . . . . . . . . . . . . . . 30 + 4.1.5. Decoding Uniformly Distributed Integers . . . . . . . 31 + 4.1.6. Current Bit Usage . . . . . . . . . . . . . . . . . . 31 + 4.2. SILK Decoder . . . . . . . . . . . . . . . . . . . . . . 33 + 4.2.1. SILK Decoder Modules . . . . . . . . . . . . . . . . 34 + 4.2.2. LP Layer Organization . . . . . . . . . . . . . . . . 35 + 4.2.3. Header Bits . . . . . . . . . . . . . . . . . . . . . 37 + 4.2.4. Per-Frame LBRR Flags . . . . . . . . . . . . . . . . 38 + + + +Valin, et al. Expires November 18, 2012 [Page 2] + +Internet-Draft Interactive Audio Codec May 2012 + + + 4.2.5. LBRR Frames . . . . . . . . . . . . . . . . . . . . . 38 + 4.2.6. Regular SILK Frames . . . . . . . . . . . . . . . . . 39 + 4.2.7. SILK Frame Contents . . . . . . . . . . . . . . . . . 39 + 4.2.7.1. Stereo Prediction Weights . . . . . . . . . . . . 42 + 4.2.7.2. Mid-only Flag . . . . . . . . . . . . . . . . . . 44 + 4.2.7.3. Frame Type . . . . . . . . . . . . . . . . . . . 45 + 4.2.7.4. Subframe Gains . . . . . . . . . . . . . . . . . 46 + 4.2.7.5. Normalized Line Spectral Frequency (LSF) and + Linear Predictive Coding (LPC) Coefficients . . . 48 + 4.2.7.6. Long-Term Prediction (LTP) Parameters . . . . . . 76 + 4.2.7.7. Linear Congruential Generator (LCG) Seed . . . . 88 + 4.2.7.8. Excitation . . . . . . . . . . . . . . . . . . . 88 + 4.2.7.9. SILK Frame Reconstruction . . . . . . . . . . . . 100 + 4.2.8. Stereo Unmixing . . . . . . . . . . . . . . . . . . . 103 + 4.2.9. Resampling . . . . . . . . . . . . . . . . . . . . . 104 + 4.3. CELT Decoder . . . . . . . . . . . . . . . . . . . . . . 105 + 4.3.1. Transient Decoding . . . . . . . . . . . . . . . . . 110 + 4.3.2. Energy Envelope Decoding . . . . . . . . . . . . . . 110 + 4.3.3. Bit Allocation . . . . . . . . . . . . . . . . . . . 112 + 4.3.4. Shape Decoding . . . . . . . . . . . . . . . . . . . 118 + 4.3.5. Anti-Collapse Processing . . . . . . . . . . . . . . 122 + 4.3.6. Denormalization . . . . . . . . . . . . . . . . . . . 123 + 4.3.7. Inverse MDCT . . . . . . . . . . . . . . . . . . . . 123 + 4.4. Packet Loss Concealment (PLC) . . . . . . . . . . . . . . 124 + 4.4.1. Clock Drift Compensation . . . . . . . . . . . . . . 124 + 4.5. Configuration Switching . . . . . . . . . . . . . . . . . 125 + 4.5.1. Transition Side Information (Redundancy) . . . . . . 126 + 4.5.2. State Reset . . . . . . . . . . . . . . . . . . . . . 129 + 4.5.3. Summary of Transitions . . . . . . . . . . . . . . . 129 + 5. Opus Encoder . . . . . . . . . . . . . . . . . . . . . . . . 132 + 5.1. Range Encoder . . . . . . . . . . . . . . . . . . . . . . 133 + 5.1.1. Encoding Symbols . . . . . . . . . . . . . . . . . . 134 + 5.1.2. Alternate Encoding Methods . . . . . . . . . . . . . 135 + 5.1.3. Encoding Raw Bits . . . . . . . . . . . . . . . . . . 136 + 5.1.4. Encoding Uniformly Distributed Integers . . . . . . . 136 + 5.1.5. Finalizing the Stream . . . . . . . . . . . . . . . . 136 + 5.1.6. Current Bit Usage . . . . . . . . . . . . . . . . . . 137 + 5.2. SILK Encoder . . . . . . . . . . . . . . . . . . . . . . 137 + 5.2.1. Sample Rate Conversion . . . . . . . . . . . . . . . 137 + 5.2.2. Stereo Mixing . . . . . . . . . . . . . . . . . . . . 138 + 5.2.3. SILK Core Encoder . . . . . . . . . . . . . . . . . . 138 + 5.3. CELT Encoder . . . . . . . . . . . . . . . . . . . . . . 151 + 5.3.1. Pitch Prefilter . . . . . . . . . . . . . . . . . . . 151 + 5.3.2. Bands and Normalization . . . . . . . . . . . . . . . 152 + 5.3.3. Energy Envelope Quantization . . . . . . . . . . . . 152 + 5.3.4. Bit Allocation . . . . . . . . . . . . . . . . . . . 152 + 5.3.5. Stereo Decisions . . . . . . . . . . . . . . . . . . 153 + 5.3.6. Time-Frequency Decision . . . . . . . . . . . . . . . 154 + + + +Valin, et al. Expires November 18, 2012 [Page 3] + +Internet-Draft Interactive Audio Codec May 2012 + + + 5.3.7. Spreading Values Decision . . . . . . . . . . . . . . 154 + 5.3.8. Spherical Vector Quantization . . . . . . . . . . . . 155 + 6. Conformance . . . . . . . . . . . . . . . . . . . . . . . . . 157 + 6.1. Testing . . . . . . . . . . . . . . . . . . . . . . . . . 157 + 6.2. Opus Custom . . . . . . . . . . . . . . . . . . . . . . . 158 + 7. Security Considerations . . . . . . . . . . . . . . . . . . . 159 + 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 161 + 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 162 + 10. Copying Conditions . . . . . . . . . . . . . . . . . . . . . 163 + 11. References . . . . . . . . . . . . . . . . . . . . . . . . . 164 + 11.1. Normative References . . . . . . . . . . . . . . . . . . 164 + 11.2. Informative References . . . . . . . . . . . . . . . . . 164 + Appendix A. Reference Implementation . . . . . . . . . . . . . . 168 + A.1. Extracting the source . . . . . . . . . . . . . . . . . . 168 + A.2. Up-to-date Implementation . . . . . . . . . . . . . . . . 169 + A.3. Base64-encoded Source Code . . . . . . . . . . . . . . . 169 + A.4. Test Vectors . . . . . . . . . . . . . . . . . . . . . . 325 + Appendix B. Self-Delimiting Framing . . . . . . . . . . . . . . 327 + Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 331 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 4] + +Internet-Draft Interactive Audio Codec May 2012 + + +1. Introduction + + The Opus codec is a real-time interactive audio codec designed to + meet the requirements described in [requirements]. It is composed of + a linear prediction (LP)-based [LPC] layer and a Modified Discrete + Cosine Transform (MDCT)-based [MDCT] layer. The main idea behind + using two layers is that in speech, linear prediction techniques + (such as Code-Excited Linear Prediction, or 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. Only the decoder portion of this software + is normative, though a significant amount of code is shared by both + the encoder and decoder. Section 6 provides a decoder conformance + test. The decoder contains a great deal of integer and fixed-point + arithmetic which needs to be performed exactly, including all + rounding considerations, so any useful specification requires 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 November 18, 2012 [Page 5] + +Internet-Draft Interactive Audio Codec May 2012 + + +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 [rfc2119]. + + Various operations in the codec require bit-exact fixed-point + behavior, even when writing a floating point implementation. 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 the syntax "x**y" indicates x + raised to the power y. 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 November 18, 2012 [Page 6] + +Internet-Draft Interactive Audio Codec May 2012 + + +1.1.5. abs(x) + + The absolute value of x, i.e., + + abs(x) = sign(x)*x . + +1.1.6. floor(f) + + The largest integer z such that z <= f. + +1.1.7. ceil(f) + + The smallest integer z such that z >= f. + +1.1.8. round(f) + + The integer z nearest to f, with ties rounded towards negative + infinity, i.e., + + round(f) = ceil(f - 0.5) . + +1.1.9. log2(f) + + The base-two logarithm of f. + +1.1.10. 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 + + + + +Valin, et al. Expires November 18, 2012 [Page 7] + +Internet-Draft Interactive Audio Codec May 2012 + + + o ilog(7) = 3 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 8] + +Internet-Draft Interactive Audio Codec May 2012 + + +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. The codec allows input and output of various + audio bandwidths, defined as follows: + + +----------------------+-----------------+-------------------------+ + | Abbreviation | Audio Bandwidth | Sample 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 | + +----------------------+-----------------+-------------------------+ + + Table 1 + + (*) Although the sampling theorem allows a bandwidth as large as half + the sampling rate, Opus never codes audio above 20 kHz, as that is + the generally accepted upper limit of human hearing. + + Opus defines super-wideband (SWB) with an effective sample rate of + 24 kHz, unlike some other audio coding standards that use 32 kHz. + This was chosen for a number of reasons. The band layout in the MDCT + layer naturally allows skipping coefficients for frequencies over + 12 kHz, but does not allow cleanly dropping just those frequencies + over 16 kHz. A sample rate of 24 kHz also makes resampling in the + MDCT layer easier, as 24 evenly divides 48, and when 24 kHz is + sufficient, it can save computation in other processing, such as + Acoustic Echo Cancellation (AEC). Experimental changes to the band + layout to allow a 16 kHz cutoff (32 kHz effective sample rate) showed + potential quality degradations at other sample rates, and at typical + bitrates the number of bits saved by using such a cutoff instead of + coding in fullband (FB) mode is very small. Therefore, if an + application wishes to process a signal sampled at 32 kHz, it should + just use FB. + + The LP layer is based on the SILK codec [SILK]. It supports NB, MB, + + + +Valin, et al. Expires November 18, 2012 [Page 9] + +Internet-Draft Interactive Audio Codec May 2012 + + + or WB audio and frame sizes from 10 ms to 60 ms, and requires an + additional 5 ms look-ahead for noise shaping estimation. A small + additional delay (up to 1.5 ms) may be required for sampling rate + conversion. Like Vorbis [Vorbis-website] and many other modern + codecs, SILK is inherently designed for variable-bitrate (VBR) + coding, though the encoder can also produce constant-bitrate (CBR) + streams. The version of SILK used in Opus is substantially modified + from, and not compatible with, the stand-alone SILK codec previously + deployed by Skype. This document does not serve to define that + format, but those interested in the original SILK codec should see + [SILK] instead. + + The MDCT layer is based on the CELT codec [CELT]. It supports 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 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. The LP + layer codes the low frequencies by resampling the signal down to WB. + The MDCT layer follows, coding the high frequency portion of the + signal. The cutoff between the two lies at 8 kHz, the maximum WB + audio bandwidth. In the MDCT layer, all bands below 8 kHz are + discarded, so there is no coding redundancy between the two layers. + + The sample rate (in contrast to the actual audio bandwidth) 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. + Internally, the LP layer always operates at a sample rate of twice + the audio bandwidth, up to a maximum of 16 kHz, which it continues to + use for SWB and FB. The decoder simply resamples its output to + support different sample rates. The MDCT layer always operates + internally at a sample rate of 48 kHz. Since all the supported + sample rates evenly divide this rate, and since the the decoder may + easily zero out the high frequency portion of the spectrum in the + frequency domain, it can simply decimate the MDCT layer output to + achieve the other supported sample rates very cheaply. + + After conversion to the common, desired output sample rate, the + + + +Valin, et al. Expires November 18, 2012 [Page 10] + +Internet-Draft Interactive Audio Codec May 2012 + + + decoder simply adds the output from the two layers together. To + compensate for the different look-ahead 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 look- + ahead 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. + +2.1. Control Parameters + + The Opus codec includes a number of control parameters which can be + changed dynamically during regular operation of the codec, without + interrupting the audio stream from the encoder to the decoder. These + parameters only affect the encoder since any impact they have on the + bit-stream is signaled in-band such that a decoder can decode any + Opus stream without any out-of-band signaling. Any Opus + implementation can add or modify these control parameters without + affecting interoperability. The most important encoder control + parameters in the reference encoder are listed below. + +2.1.1. Bitrate + + Opus supports all bitrates from 6 kb/s to 510 kb/s. All other + parameters being equal, higher bitrate results in higher quality. + For a frame size of 20 ms, these are the bitrate "sweet spots" for + Opus in various configurations: + + o 8-12 kb/s for NB speech, + + o 16-20 kb/s for WB speech, + + o 28-40 kb/s for FB speech, + + o 48-64 kb/s for FB mono music, and + + o 64-128 kb/s for FB stereo music. + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 11] + +Internet-Draft Interactive Audio Codec May 2012 + + +2.1.2. Number of Channels (Mono/Stereo) + + Opus can transmit either mono or stereo frames within a single + stream. When decoding a mono frame in a stereo decoder, the left and + right channels are identical, and when decoding a stereo frame in a + mono decoder, the mono output is the average of the left and right + channels. In some cases, it is desirable to encode a stereo input + stream in mono (e.g., because the bitrate is too low to encode stereo + with sufficient quality). The number of channels encoded can be + selected in real-time, but by default the reference encoder attempts + to make the best decision possible given the current bitrate. + +2.1.3. Audio Bandwidth + + The audio bandwidths supported by Opus are listed in Table 1. Just + like for the number of channels, any decoder can decode audio encoded + at any bandwidth. For example, any Opus decoder operating at 8 kHz + can decode a FB Opus frame, and any Opus decoder operating at 48 kHz + can decode a NB frame. Similarly, the reference encoder can take a + 48 kHz input signal and encode it as NB. The higher the audio + bandwidth, the higher the required bitrate to achieve acceptable + quality. The audio bandwidth can be explicitly specified in real- + time, but by default the reference encoder attempts to make the best + bandwidth decision possible given the current bitrate. + +2.1.4. Frame Duration + + Opus can encode frames of 2.5, 5, 10, 20, 40 or 60 ms. It can also + combine multiple frames into packets of up to 120 ms. For real-time + applications, sending fewer packets per second reduces the bitrate, + since it reduces the overhead from IP, UDP, and RTP headers. + However, it increases latency and sensitivity to packet losses, as + losing one packet constitutes a loss of a bigger chunk of audio. + Increasing the frame duration also slightly improves coding + efficiency, but the gain becomes small for frame sizes above 20 ms. + For this reason, 20 ms frames are a good choice for most + applications. + +2.1.5. Complexity + + There are various aspects of the Opus encoding process where trade- + offs can be made between CPU complexity and quality/bitrate. In the + reference encoder, the complexity is selected using an integer from 0 + to 10, where 0 is the lowest complexity and 10 is the highest. + Examples of computations for which such trade-offs may occur are: + + o The order of the pitch analysis whitening filter [Whitening], + + + + +Valin, et al. Expires November 18, 2012 [Page 12] + +Internet-Draft Interactive Audio Codec May 2012 + + + o The order of the short-term noise shaping filter, + + o The number of states in delayed decision quantization of the + residual signal, and + + o The use of certain bit-stream features such as variable time- + frequency resolution and the pitch post-filter. + +2.1.6. Packet Loss Resilience + + Audio codecs often exploit inter-frame correlations to reduce the + bitrate at a cost in error propagation: after losing one packet + several packets need to be received before the decoder is able to + accurately reconstruct the speech signal. The extent to which Opus + exploits inter-frame dependencies can be adjusted on the fly to + choose a trade-off between bitrate and amount of error propagation. + +2.1.7. Forward Error Correction (FEC) + + Another mechanism providing robustness against packet loss is the in- + band Forward Error Correction (FEC). Packets that are determined to + contain perceptually important speech information, such as onsets or + transients, are encoded again at a lower bitrate and this re-encoded + information is added to a subsequent packet. + +2.1.8. Constant/Variable Bitrate + + Opus is more efficient when operating with variable bitrate (VBR), + which is the default. However, in some (rare) applications, constant + bitrate (CBR) is required. There are two main reasons to operate in + CBR mode: + + o When the transport only supports a fixed size for each compressed + frame + + o When encryption is used for an audio stream that is either highly + constrained (e.g. yes/no, recorded prompts) or highly sensitive + [SRTP-VBR] + + When low-latency transmission is required over a relatively slow + connection, then constrained VBR can also be used. This uses VBR in + a way that simulates a "bit reservoir" and is equivalent to what MP3 + (MPEG 1, Layer 3) and AAC (Advanced Audio Coding) call CBR (i.e., not + true CBR due to the bit reservoir). + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 13] + +Internet-Draft Interactive Audio Codec May 2012 + + +2.1.9. Discontinuous Transmission (DTX) + + Discontinuous Transmission (DTX) reduces the bitrate during silence + or background noise. When DTX is enabled, only one frame is encoded + every 400 milliseconds. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 14] + +Internet-Draft Interactive Audio Codec May 2012 + + +3. Internal Framing + + The Opus encoder produces "packets", which are each a contiguous set + of bytes meant to be transmitted as a single unit. The packets + described here do not include such things as IP, UDP, or RTP headers + which are normally found in a transport-layer packet. A single + packet may contain multiple audio frames, so long as they share a + common set of parameters, including the operating mode, audio + bandwidth, frame size, and channel count (mono vs. stereo). 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 [RFC3550] or Ogg [RFC3533] or + Matroska [Matroska-website]) 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 B. + Support for that variant is OPTIONAL. + + All bit diagrams in this document number the bits so that bit 0 is + the most significant bit of the first byte, and bit 7 is the least + significant. Bit 8 is thus the most significant bit of the second + byte, etc. Well-formed Opus packets obey certain requirements, + marked [R1] through [R7] below. These are summarized in Section 3.4 + along with appropriate means of handling malformed packets. + +3.1. The TOC Byte + + A well-formed Opus packet MUST contain at least one byte [R1]. This + byte forms a table-of-contents (TOC) header that signals which of the + various modes and configurations a given packet uses. It is composed + of a configuration number, "config", a stereo flag, "s", and a frame + count code, "c", arranged as illustrated in Figure 1. A description + of each of these fields follows. + + 0 + 0 1 2 3 4 5 6 7 + +-+-+-+-+-+-+-+-+ + | config |s| c | + +-+-+-+-+-+-+-+-+ + + 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. As described, the LP (SILK) layer and MDCT (CELT) layer can be + combined in three possible operating modes: + + + +Valin, et al. Expires November 18, 2012 [Page 15] + +Internet-Draft Interactive Audio Codec May 2012 + + + 1. A SILK-only mode for use in low bitrate connections with an audio + bandwidth of WB or less, + + 2. A Hybrid (SILK+CELT) mode for SWB or FB speech at medium + bitrates, and + + 3. A CELT-only mode for very low delay speech transmission as well + as music transmission (NB to FB). + + The 32 possible configurations each identify which one of these + operating modes the packet uses, as well as the audio bandwidth and + the frame size. Table 2 lists the parameters for each configuration. + + +-----------------------+-----------+-----------+-------------------+ + | Configuration | Mode | Bandwidth | Frame Sizes | + | Number(s) | | | | + +-----------------------+-----------+-----------+-------------------+ + | 0...3 | SILK-only | NB | 10, 20, 40, 60 ms | + | | | | | + | 4...7 | SILK-only | MB | 10, 20, 40, 60 ms | + | | | | | + | 8...11 | SILK-only | WB | 10, 20, 40, 60 ms | + | | | | | + | 12...13 | Hybrid | SWB | 10, 20 ms | + | | | | | + | 14...15 | Hybrid | FB | 10, 20 ms | + | | | | | + | 16...19 | CELT-only | NB | 2.5, 5, 10, 20 ms | + | | | | | + | 20...23 | CELT-only | WB | 2.5, 5, 10, 20 ms | + | | | | | + | 24...27 | CELT-only | SWB | 2.5, 5, 10, 20 ms | + | | | | | + | 28...31 | CELT-only | FB | 2.5, 5, 10, 20 ms | + +-----------------------+-----------+-----------+-------------------+ + + Table 2: TOC Byte Configuration Parameters + + The configuration numbers in each range (e.g., 0...3 for NB SILK- + only) correspond to the various choices of frame size, in the same + order. For example, configuration 0 has a 10 ms frame size and + configuration 3 has a 60 ms frame size. + + One additional bit, labeled "s", signals 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: + + + +Valin, et al. Expires November 18, 2012 [Page 16] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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". + +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 (i.e., code 2 or 3), 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 (discontinuous transmission (DTX) or lost packet) + + o 1...251: Length of the frame in bytes + + o 252...255: A second byte is needed. The total length is + (second_byte*4)+first_byte + + The special length 0 indicates that no frame is available, either + because it was dropped during transmission by some intermediary or + because the encoder chose not to transmit it. Any Opus frame in any + mode MAY have a length of 0. + + The maximum representable length is 255*4+255=1275 bytes. 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 for + 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 [R2], to allow for repacketization by gateways, conference + + + +Valin, et al. Expires November 18, 2012 [Page 17] + +Internet-Draft Interactive Audio Codec May 2012 + + + bridges, or other software. + +3.2.2. Code 0: One Frame in the Packet + + 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. + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|0|0| | + +-+-+-+-+-+-+-+-+ | + | Compressed frame 1 (N-1 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 2: A Code 0 Packet + +3.2.3. Code 1: Two Frames in the Packet, Each with Equal Compressed + Size + + 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 [R3]. + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|0|1| | + +-+-+-+-+-+-+-+-+ : + | Compressed frame 1 ((N-1)/2 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 2 ((N-1)/2 bytes)... | + : +-+-+-+-+-+-+-+-+ + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 3: A Code 1 Packet + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 18] + +Internet-Draft Interactive Audio Codec May 2012 + + +3.2.4. Code 2: Two Frames in the Packet, with Different Compressed + Sizes + + 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 + Figure 4), 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. A code 2 + packet MUST contain enough bytes to represent a valid length. For + example, a 1-byte code 2 packet is always invalid, and a 2-byte code + 2 packet whose second byte is in the range 252...255 is also invalid. + The length of the first frame, N1, MUST also be no larger than the + size of the payload remaining after decoding that length for all code + 2 packets [R4]. This makes, for example, a 2-byte code 2 packet with + a second byte in the range 1...251 invalid as well (the only valid + 2-byte code 2 packet is one where the length of both frames is zero). + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|0| N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 2... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 4: A Code 2 Packet + +3.2.5. Code 3: A Signaled Number of Frames in the Packet + + Code 3 packets signal the number of frames, 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. Code 3 + packets MUST have at least 2 bytes [R6,R7]. The TOC byte is followed + by a byte encoding the number of frames in the packet in bits 2 to 7 + (marked "M" in Figure 5), with bit 1 indicating whether or not Opus + padding is inserted (marked "p" in Figure 5), and bit 0 indicating + VBR (marked "v" in Figure 5). M MUST NOT be zero, and the audio + duration contained within a packet MUST NOT exceed 120 ms [R5]. 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. + + + + +Valin, et al. Expires November 18, 2012 [Page 19] + +Internet-Draft Interactive Audio Codec May 2012 + + + 0 + 0 1 2 3 4 5 6 7 + +-+-+-+-+-+-+-+-+ + |v|p| M | + +-+-+-+-+-+-+-+-+ + + 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. There MUST be at least + one more byte in the packet in this case [R6,R7]. The additional + padding bytes appear at the end of the packet, and MUST be set to + zero by the encoder to avoid creating a covert channel. The decoder + MUST accept any value for the padding bytes, however. + + Although this encoding provides multiple ways to indicate a given + number of padding bytes, each uses a different number of bytes to + indicate the padding size, and thus will increase the total packet + size by a different amount. For example, to add 255 bytes to a + packet, set the padding bit, p, to 1, insert a single byte after the + frame count byte with a value of 254, and append 254 padding bytes + with the value zero to the end of the packet. To add 256 bytes to a + packet, set the padding bit to 1, insert two bytes after the frame + count byte with the values 255 and 0, respectively, and append 254 + padding bytes with the value zero to the end of the packet. By using + the value 255 multiple times, it is possible to create a packet of + any specific, desired size. Let P be the number of header bytes used + to indicate the padding size plus the number of padding bytes + themselves (i.e., P is the total number of bytes added to the + packet). Then P MUST be no more than N-2 [R6,R7]. + + In the CBR case, let R=N-2-P be the number of bytes remaining in the + packet after subtracting the (optional) padding. Then the compressed + length of each frame in bytes is equal to R/M. The value R MUST be a + non-negative integer multiple of M [R6]. The compressed data for all + M frames follows, each of size R/M bytes, as illustrated in Figure 6. + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 20] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|1|0|p| M | Padding length (Optional) : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 1 (R/M bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame 2 (R/M bytes)... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : ... : + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | + : Compressed frame M (R/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 Figure 7), each + encoded in a one- or two-byte sequence as described above. The + packet MUST contain enough data for the M-1 lengths after removing + 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 [R7]. 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. The number of header bytes (TOC byte, + frame count byte, padding length bytes, and frame length bytes), plus + the signaled length of the first M-1 frames themselves, plus the + signaled length of the padding MUST be no larger than N, the total + size of the packet. + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 21] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|1|1|p| M | 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | 1 |0|0|0| compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 8 + + Two FB mono 5 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | 29 |0|0|1| compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + + + +Valin, et al. Expires November 18, 2012 [Page 22] + +Internet-Draft Interactive Audio Codec May 2012 + + + Figure 9 + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | 15 |0|1|1|1|0| 2 | N1 | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 10 + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | 31 |1|1|1|0|0| 4 | compressed data... : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 11 + +3.4. Receiving Malformed Packets + + A receiver MUST NOT process packets which violate any of the rules + above as normal Opus packets. They are reserved for future + applications, such as in-band headers (containing metadata, etc.). + Packets which violate these constraints may cause implementations of + _this_ specification to treat them as malformed, and discard them. + + These constraints are summarized here for reference: + + [R1] Packets are at least one byte. + + [R2] No implicit frame length is larger than 1275 bytes. + + [R3] Code 1 packets have an odd total length, N, so that (N-1)/2 is + an integer. + + [R4] Code 2 packets have enough bytes after the TOC for a valid + frame length, and that length is no larger than the number of + bytes remaining in the packet. + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 23] + +Internet-Draft Interactive Audio Codec May 2012 + + + [R5] Code 3 packets contain at least one frame, but no more than + 120 ms of audio total. + + [R6] The length of a CBR code 3 packet, N, is at least two bytes, + the number of bytes added to indicate the padding size plus the + trailing padding bytes themselves, P, is no more than N-2, and + the frame count, M, satisfies the constraint that (N-2-P) is a + non-negative integer multiple of M. + + [R7] VBR code 3 packets are large enough to contain all the header + bytes (TOC byte, frame count byte, any padding length bytes, + and any frame length bytes), plus the length of the first M-1 + frames, plus any trailing padding bytes. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 24] + +Internet-Draft Interactive Audio Codec May 2012 + + +4. Opus Decoder + + The Opus decoder consists of two main blocks: the SILK decoder and + the CELT decoder. At any given time, one or both of the SILK and + CELT decoders may be active. 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 on the SILK side, and optional + decimation (when decoding to sample rates less than 48 kHz) on the + CELT side, as illustrated in the block diagram below. + + + +---------+ +------------+ + | SILK | | Sample | + +->| Decoder |--->| Rate |----+ + Bit- +---------+ | | | | Conversion | v + stream | Range |---+ +---------+ +------------+ /---\ Audio + ------->| Decoder | | + |------> + | |---+ +---------+ +------------+ \---/ + +---------+ | | CELT | | Decimation | ^ + +->| Decoder |--->| (Optional) |----+ + | | | | + +---------+ +------------+ + + +4.1. Range Decoder + + Opus uses an entropy coder based on range coding [range-coding] + [Martin79], 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., + a byte). 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 12. 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 November 18, 2012 [Page 25] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | Range coder data (packed MSB to LSB) -> : + + + + : : + + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : | <- Boundary occurs at an arbitrary bit position : + +-+-+-+ + + : <- Raw bits data (packed LSB to MSB) | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 12: 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. + + 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 + symbol k 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". Because 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 = \ 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. + +4.1.1. Range Decoder Initialization + + Let b0 be the first input byte (or zero if there are no bytes in this + Opus frame). The decoder initializes rng to 128 and initializes val + to (127 - (b0>>1)), where (b0>>1) is the top 7 bits of the first + + + +Valin, et al. Expires November 18, 2012 [Page 26] + +Internet-Draft Interactive Audio Codec May 2012 + + + input byte. It saves the remaining bit, (b0&1), for use in the + renormalization procedure described in Section 4.1.2.1, which the + decoder invokes immediately after initialization to read additional + bits and establish the invariant that rng > 2**23. + +4.1.2. 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 + + val + fs = ft - min(------ + 1, ft) . + rng/ft + + The divisions here are 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 + + rng + val = val - --- * (ft - fh[k]) . + ft + + If fl[k] is greater than zero, then the decoder updates rng using + + rng + rng = --- * (fh[k] - fl[k]) . + ft + + Otherwise, it updates rng using + + rng + rng = rng - --- * (ft - fh[k]) . + ft + + 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 + + + +Valin, et al. Expires November 18, 2012 [Page 27] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 4.1.3 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. + +4.1.2.1. 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 byte of the + Opus frame and forms an 8-bit value sym, using the left-over bit + buffered from the previous byte as the high bit and the top 7 bits of + the byte just read as the other 7 bits of sym. The remaining bit in + the byte just read is buffered for use in the next iteration. If no + more input bytes remain, it uses zero bits instead. See + Section 4.1.1 for the initialization used to process the first byte. + 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 13. + 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 5.1.5 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. + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 28] + +Internet-Draft Interactive Audio Codec May 2012 + + + n n+1 n+2 n+3 + 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + : | <----------- Overlap region ------------> | : + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + ^ ^ + | End of data buffered by the range coder | + ...-----------------------------------------------+ + | + | End of data consumed by raw bits + +-------------------------------------------------------... + + Figure 13: Illustrative example of raw bits overlapping range coder + data + +4.1.3. 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. + +4.1.3.1. 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 << (ftb - 8)) | ec_dec_bits(ftb - 8) . + + If, at this point, 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 the error has + occurred. + +4.1.6. 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 + + + +Valin, et al. Expires November 18, 2012 [Page 31] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 range coder symbol that requires + a whole number of bits (i.e., for which ft/(fh[k] - fl[k]) is a power + of two), where there are at least p 1/8th bits available, decoding + the symbol will never cause ec_tell() or ec_tell_frac() to exceed the + size of the frame ("bust the budget"). In this case the return value + of ec_tell_frac() will only advance by more than p 1/8th bits if + there was an additional, fractional number of bits remaining, and it + will never advance beyond the next whole-bit boundary, which is safe, + since frames always contain a whole number of bits. However, when p + is not a whole number of bits, an extra 1/8th bit is required to + ensure that decoding the symbol will not bust the budget. + + The reference implementation keeps track of the total number of whole + bits that have been processed by the decoder so far in the 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 9 just before the initial range + renormalization process completes (or equivalently, it can be + initialized to 33 after 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. + +4.1.6.1. ec_tell() + + The whole number of bits buffered in rng may be estimated via lg = + ilog(rng). ec_tell() then becomes a simple matter of removing these + + + +Valin, et al. Expires November 18, 2012 [Page 32] + +Internet-Draft Interactive Audio Codec May 2012 + + + bits from the total. It returns (nbits_total - lg). + + 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. + +4.1.6.2. 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, lg must be at least 24. Let + + + r_Q15 = rng >> (lg-16) , + + so that 32768 <= r_Q15 < 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 lg. First, update + + + r_Q15 = (r_Q15*r_Q15) >> 15 . + + Then add the 16th bit of r_Q15 to lg via + + + lg = 2*lg + (r_Q15 >> 16) . + + Finally, if this bit was a 1, reduce r_Q15 by a factor of two via + + + r_Q15 = r_Q15 >> 1 , + + so that it once again lies in the range 32768 <= r_Q15 < 65536. + + This procedure is repeated three times to extend lg to 1/8th bit + precision. ec_tell_frac() then returns (nbits_total*8 - lg). + +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 at NB, MB, and WB sample rates internally. When + used in a SWB or FB Hybrid frame, the LP layer itself still only runs + in WB. + + + + + + +Valin, et al. Expires November 18, 2012 [Page 33] + +Internet-Draft Interactive Audio Codec May 2012 + + +4.2.1. SILK Decoder Modules + + An overview of the decoder is given in Figure 14. + + + +---------+ +------------+ + -->| Range |--->| Decode |---------------------------+ + 1 | Decoder | 2 | Parameters |----------+ 5 | + +---------+ +------------+ 4 | | + 3 | | | + \/ \/ \/ + +------------+ +------------+ +------------+ + | Generate |-->| LTP |-->| LPC | + | Excitation | | Synthesis | | Synthesis | + +------------+ +------------+ +------------+ + ^ | + | | + +-------------------+----------------+ + | 6 + | +------------+ +-------------+ + +-->| Stereo |-->| Sample Rate |--> + | Unmixing | 7 | Conversion | 8 + +------------+ +-------------+ + + 1: Range encoded bitstream + 2: Coded parameters + 3: Pulses, LSBs, and signs + 4: Pitch lags, Long-Term Prediction (LTP) coefficients + 5: Linear Predictive Coding (LPC) coefficients and gains + 6: Decoded signal (mono or mid-side stereo) + 7: Unmixed signal (mono or left-right stereo) + 8: Resampled signal + + + Figure 14: SILK Decoder + + The decoder feeds the bitstream (1) to the range decoder from + Section 4.1, and then decodes the parameters in it (2) using the + procedures detailed in Sections 4.2.3 through 4.2.7.8.5. These + parameters (3, 4, 5) are used to generate an excitation signal (see + Section 4.2.7.8.6), which is fed to an optional long-term prediction + (LTP) filter (voiced frames only, see Section 4.2.7.9.1) and then a + short-term prediction filter (see Section 4.2.7.9.2), producing the + decoded signal (6). For stereo streams, the mid-side representation + is converted to separate left and right channels (7). The result is + finally resampled to the desired output sample rate (e.g., 48 kHz) so + that the resampled signal (8) can be mixed with the CELT layer. + + + + +Valin, et al. Expires November 18, 2012 [Page 34] + +Internet-Draft Interactive Audio Codec May 2012 + + +4.2.2. LP Layer Organization + + Internally, the LP layer of a single Opus frame is composed of either + a single 10 ms regular SILK frame or between one and three 20 ms + regular SILK frames. A stereo Opus frame may double the number of + regular SILK frames (up to a total of six), since it includes + separate frames for a mid channel and, optionally, a side channel. + Optional Low Bit-Rate Redundancy (LBRR) frames, which are reduced- + bitrate encodings of previous SILK frames, may be included 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. This draft uses "SILK frame" to refer to either one and + "regular SILK frame" if it needs to draw a distinction between the + two. + + Logically, each SILK frame is in turn composed of either two or four + 5 ms subframes. Various parameters, such as the quantization gain of + the excitation and the pitch lag and filter coefficients can vary on + a subframe-by-subframe basis. Physically, the parameters for each + subframe are interleaved in the bitstream, as described in the + relevant sections for each parameter. + + 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. + + Table 3 summarizes the overall grouping of the contents of the LP + layer. Figures 15 and 16 illustrate the ordering of the various SILK + frames for a 60 ms Opus frame, for both mono and stereo, + respectively. + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 35] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-----------------------------------+---------------+---------------+ + | Symbol(s) | PDF(s) | Condition | + +-----------------------------------+---------------+---------------+ + | Voice Activity Detection (VAD) | {1, 1}/2 | | + | flags | | | + | | | | + | LBRR flag | {1, 1}/2 | | + | | | | + | Per-frame LBRR flags | Table 4 | Section 4.2.4 | + | | | | + | LBRR Frame(s) | Section 4.2.7 | Section 4.2.4 | + | | | | + | Regular SILK Frame(s) | Section 4.2.7 | | + +-----------------------------------+---------------+---------------+ + + Table 3: Organization of the SILK layer of an Opus frame + + + +---------------------------------+ + | VAD Flags | + +---------------------------------+ + | LBRR Flag | + +---------------------------------+ + | Per-Frame LBRR Flags (Optional) | + +---------------------------------+ + | LBRR Frame 1 (Optional) | + +---------------------------------+ + | LBRR Frame 2 (Optional) | + +---------------------------------+ + | LBRR Frame 3 (Optional) | + +---------------------------------+ + | Regular SILK Frame 1 | + +---------------------------------+ + | Regular SILK Frame 2 | + +---------------------------------+ + | Regular SILK Frame 3 | + +---------------------------------+ + + Figure 15: A 60 ms Mono Frame + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 36] + +Internet-Draft Interactive Audio Codec May 2012 + + + +---------------------------------------+ + | Mid VAD Flags | + +---------------------------------------+ + | Mid LBRR Flag | + +---------------------------------------+ + | Side VAD Flags | + +---------------------------------------+ + | Side LBRR Flag | + +---------------------------------------+ + | Mid Per-Frame LBRR Flags (Optional) | + +---------------------------------------+ + | Side Per-Frame LBRR Flags (Optional) | + +---------------------------------------+ + | Mid LBRR Frame 1 (Optional) | + +---------------------------------------+ + | Side LBRR Frame 1 (Optional) | + +---------------------------------------+ + | Mid LBRR Frame 2 (Optional) | + +---------------------------------------+ + | Side LBRR Frame 2 (Optional) | + +---------------------------------------+ + | Mid LBRR Frame 3 (Optional) | + +---------------------------------------+ + | Side LBRR Frame 3 (Optional) | + +---------------------------------------+ + | Mid Regular SILK Frame 1 | + +---------------------------------------+ + | Side Regular SILK Frame 1 (Optional) | + +---------------------------------------+ + | Mid Regular SILK Frame 2 | + +---------------------------------------+ + | Side Regular SILK Frame 2 (Optional) | + +---------------------------------------+ + | Mid Regular SILK Frame 3 | + +---------------------------------------+ + | Side Regular SILK Frame 3 (Optional) | + +---------------------------------------+ + + Figure 16: A 60 ms Stereo Frame + +4.2.3. Header Bits + + The LP layer begins with two to eight header bits, decoded in + silk_Decode() (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 + first flags correspond to the mid channel, and a second set of flags + is included for the side channel. + + + +Valin, et al. Expires November 18, 2012 [Page 37] + +Internet-Draft Interactive Audio Codec May 2012 + + + Because these are the first symbols decoded by the range coder and + because they are coded as binary values with uniform probability, + they can be extracted directly from the most significant 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. + +4.2.4. Per-Frame LBRR Flags + + For Opus frames longer than 20 ms, a set of LBRR flags is decoded for + each channel that has its LBRR flag set. Each set contains one flag + per 20 ms SILK frame. 40 ms Opus frames use the 2-frame LBRR flag PDF + from Table 4, and 60 ms Opus frames use the 3-frame LBRR flag PDF. + 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 4: LBRR Flag PDFs + + A 10 or 20 ms Opus frame does not contain any per-frame LBRR flags, + as there may be at most one LBRR frame per channel. The global LBRR + flag in the header bits (see Section 4.2.3) is already sufficient to + indicate the presence of that single LBRR frame. + +4.2.5. LBRR Frames + + The LBRR frames, if present, contain an encoded representation of the + signal immediately prior to the current Opus frame as if it were + encoded with the current mode, frame size, audio bandwidth, and + channel count, even if those differ from the prior Opus frame. When + one of these parameters changes from one Opus frame to the next, this + implies that the LBRR frames of the current Opus frame may not be + simple drop-in replacements for the contents of the previous Opus + frame. + + For example, when switching from 20 ms to 60 ms, the 60 ms Opus frame + may contain LBRR frames covering up to three prior 20 ms Opus frames, + even if those frames already contained LBRR frames covering some of + the same time periods. When switching from 20 ms to 10 ms, the 10 ms + Opus frame can contain an LBRR frame covering at most half the prior + + + +Valin, et al. Expires November 18, 2012 [Page 38] + +Internet-Draft Interactive Audio Codec May 2012 + + + 20 ms Opus frame, potentially leaving a hole that needs to be + concealed from even a single packet loss (see Section 4.4). When + switching from mono to stereo, the LBRR frames in the first stereo + Opus frame MAY contain a non-trivial side channel. + + In order to properly produce LBRR frames under all conditions, an + encoder might need to buffer up to 60 ms of audio and re-encode it + during these transitions. However, the reference implementation opts + to disable LBRR frames at the transition point for simplicity. Since + transitions are relatively infrequent in normal usage, this does not + have a significant impact on packet loss robustness. + + The LBRR frames immediately follow the LBRR flags, prior to any + regular SILK frames. Section 4.2.7 describes their exact contents. + LBRR frames do not include their own separate VAD flags. LBRR frames + are only meant to be transmitted for active speech, thus all LBRR + frames are treated as active. + + In a stereo Opus frame longer than 20 ms, although the per-frame LBRR + flags for the mid channel are coded as a unit before the per-frame + LBRR flags for the side channel, the LBRR frames themselves are + interleaved. The decoder parses an LBRR frame for the mid channel of + a given 20 ms interval (if present) and then immediately parses the + corresponding LBRR frame for the side channel (if present), before + proceeding to the next 20 ms interval. + +4.2.6. Regular SILK Frames + + The regular SILK frame(s) follow the LBRR frames (if any). + Section 4.2.7 describes their contents, as well. Unlike the LBRR + frames, a regular SILK frame is coded for each time interval in an + Opus frame, even if the corresponding VAD flags are unset. For + stereo Opus frames longer than 20 ms, the regular mid and side SILK + frames for each 20 ms interval are interleaved, just as with the LBRR + frames. The side frame may be skipped by coding an appropriate flag, + as detailed in Section 4.2.7.2. + +4.2.7. SILK Frame Contents + + Each SILK frame includes a set of side information that encodes + + o The frame type and quantization type (Section 4.2.7.3), + + o Quantization gains (Section 4.2.7.4), + + o Short-term prediction filter coefficients (Section 4.2.7.5), + + + + + +Valin, et al. Expires November 18, 2012 [Page 39] + +Internet-Draft Interactive Audio Codec May 2012 + + + o A Line Spectral Frequencies (LSF) interpolation weight + (Section 4.2.7.5.5), + + o Long-term prediction filter lags and gains (Section 4.2.7.6), and + + o A linear congruential generator (LCG) seed (Section 4.2.7.7). + + The quantized excitation signal (see Section 4.2.7.8) follows these + at the end of the frame. Table 5 details the overall organization of + a SILK frame. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 40] + +Internet-Draft Interactive Audio Codec May 2012 + + + +---------------------------+-------------------+-------------------+ + | Symbol(s) | PDF(s) | Condition | + +---------------------------+-------------------+-------------------+ + | Stereo Prediction Weights | Table 6 | Section 4.2.7.1 | + | | | | + | Mid-only Flag | Table 8 | Section 4.2.7.2 | + | | | | + | Frame Type | Section 4.2.7.3 | | + | | | | + | Subframe Gains | Section 4.2.7.4 | | + | | | | + | Normalized LSF Stage-1 | Table 14 | | + | Index | | | + | | | | + | Normalized LSF Stage-2 | Section 4.2.7.5.2 | | + | Residual | | | + | | | | + | Normalized LSF | Table 26 | 20 ms frame | + | Interpolation Weight | | | + | | | | + | Primary Pitch Lag | Section 4.2.7.6.1 | Voiced frame | + | | | | + | Subframe Pitch Contour | Table 32 | Voiced frame | + | | | | + | Periodicity Index | Table 37 | Voiced frame | + | | | | + | LTP Filter | Table 38 | Voiced frame | + | | | | + | LTP Scaling | Table 42 | Section 4.2.7.6.3 | + | | | | + | LCG Seed | Table 43 | | + | | | | + | Excitation Rate Level | Table 45 | | + | | | | + | Excitation Pulse Counts | Table 46 | | + | | | | + | Excitation Pulse | Section 4.2.7.8.3 | Non-zero pulse | + | Locations | | count | + | | | | + | Excitation LSBs | Table 51 | Section 4.2.7.8.2 | + | | | | + | Excitation Signs | Table 52 | | + +---------------------------+-------------------+-------------------+ + + Table 5: Order of the symbols in an individual SILK frame + + + + + + +Valin, et al. Expires November 18, 2012 [Page 41] + +Internet-Draft Interactive Audio Codec May 2012 + + +4.2.7.1. Stereo Prediction Weights + + A SILK frame corresponding to the mid channel of a stereo Opus frame + begins with a pair of side channel prediction weights, designed such + that zeros indicate normal mid-side coupling. Since these weights + can change on every frame, the first portion of each frame linearly + interpolates between the previous weights and the current ones, using + zeros for the previous weights if none are available. These + prediction weights are never included in a mono Opus frame, and the + previous weights are reset to zeros on any transition from mono to + stereo. They are also not included in an LBRR frame for the side + channel, even if the LBRR flags indicate the corresponding mid + channel was not coded. In that case, the previous weights are used, + again substituting in zeros if no previous weights are available + since the last decoder reset (see Section 4.5.2). + + To summarize, these weights are coded if and only if + + o This is a stereo Opus frame (Section 3.1), and + + o The current SILK frame corresponds to the mid channel. + + The prediction weights are coded in three separate pieces, which are + decoded by silk_stereo_decode_pred() (decode_stereo_pred.c). The + first piece jointly codes the high-order part of a table index for + both weights. The second piece codes the low-order part of each + table index. The third piece codes an offset used to linearly + interpolate between table indices. The details are as follows. + + Let n be an index decoded with the 25-element stage-1 PDF in Table 6. + Then let i0 and i1 be indices decoded with the stage-2 and stage-3 + PDFs in Table 6, respectively, and let i2 and i3 be two more indices + decoded with the stage-2 and stage-3 PDFs, all in that order. + + +-------+-----------------------------------------------------------+ + | Stage | PDF | + +-------+-----------------------------------------------------------+ + | Stage | {7, 2, 1, 1, 1, 10, 24, 8, 1, 1, 3, 23, 92, 23, 3, 1, 1, | + | 1 | 8, 24, 10, 1, 1, 1, 2, 7}/256 | + | | | + | Stage | {85, 86, 85}/256 | + | 2 | | + | | | + | Stage | {51, 51, 52, 51, 51}/256 | + | 3 | | + +-------+-----------------------------------------------------------+ + + Table 6: Stereo Weight PDFs + + + +Valin, et al. Expires November 18, 2012 [Page 42] + +Internet-Draft Interactive Audio Codec May 2012 + + + Then use n, i0, and i2 to form two table indices, wi0 and wi1, + according to + + wi0 = i0 + 3*(n/5) + wi1 = i2 + 3*(n%5) + + where the division is integer division. The range of these indices + is 0 to 14, inclusive. Let w[i] be the i'th weight from Table 7. + Then the two prediction weights, w0_Q13 and w1_Q13, are + + w1_Q13 = w_Q13[wi1] + + ((w_Q13[wi1+1] - w_Q13[wi1])*6554) >> 16)*(2*i3 + 1) + + w0_Q13 = w_Q13[wi0] + + ((w_Q13[wi0+1] - w_Q13[wi0])*6554) >> 16)*(2*i1 + 1) + - w1_Q13 + + N.b., w1_Q13 is computed first here, because w0_Q13 depends on it. + The constant 6554 is approximately 0.1 in Q16. Although wi0 and wi1 + only have 15 possible values, Table 7 contains 16 entries to allow + interpolation between entry wi0 and (wi0 + 1) (and likewise for wi1). + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 43] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-------+--------------+ + | Index | Weight (Q13) | + +-------+--------------+ + | 0 | -13732 | + | | | + | 1 | -10050 | + | | | + | 2 | -8266 | + | | | + | 3 | -7526 | + | | | + | 4 | -6500 | + | | | + | 5 | -5000 | + | | | + | 6 | -2950 | + | | | + | 7 | -820 | + | | | + | 8 | 820 | + | | | + | 9 | 2950 | + | | | + | 10 | 5000 | + | | | + | 11 | 6500 | + | | | + | 12 | 7526 | + | | | + | 13 | 8266 | + | | | + | 14 | 10050 | + | | | + | 15 | 13732 | + +-------+--------------+ + + Table 7: Stereo Weight Table + +4.2.7.2. Mid-only Flag + + A flag appears after the stereo prediction weights that indicates if + only the mid channel is coded for this time interval. It appears + only when + + o This is a stereo Opus frame (see Section 3.1), + + o The current SILK frame corresponds to the mid channel, and + + + + +Valin, et al. Expires November 18, 2012 [Page 44] + +Internet-Draft Interactive Audio Codec May 2012 + + + o Either + + * This is a regular SILK frame where the VAD flags (see + Section 4.2.3) indicate that the corresponding side channel is + not active. + + * This is an LBRR frame where the LBRR flags (see Section 4.2.3 + and Section 4.2.4) indicate that the corresponding side channel + is not coded. + + It is omitted when there are no stereo weights, for all of the same + reasons. It is also omitted for a regular SILK frame when the VAD + flag of the corresponding side channel frame is set (indicating it is + active). The side channel must be coded in this case, making the + mid-only flag redundant. It is also omitted for an LBRR frame when + the corresponding LBRR flags indicate the side channel is coded. + + When the flag is present, the decoder reads a single value using the + PDF in Table 8, as implemented in silk_stereo_decode_mid_only() + (decode_stereo_pred.c). If the flag is set, then there is no + corresponding SILK frame for the side channel, the entire decoding + process for the side channel is skipped, and zeros are fed to the + stereo unmixing process (see Section 4.2.8) instead. As stated + above, LBRR frames still include this flag when the LBRR flag + indicates that the side channel is not coded. In that case, if this + flag is zero (indicating that there should be a side channel), then + Packet Loss Concealment (PLC, see Section 4.4) SHOULD be invoked to + recover a side channel signal. Otherwise, the stereo image will + collapse. + + +---------------+ + | PDF | + +---------------+ + | {192, 64}/256 | + +---------------+ + + Table 8: Mid-only Flag PDF + +4.2.7.3. Frame Type + + Each SILK frame contains 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 a value of either 0 or 1 and is decoded using the + first PDF in Table 9. If the frame is an LBRR frame or a regular + SILK frame whose VAD flag was set (an "active" frame), then the value + of the symbol may range from 2 to 5, inclusive, and is decoded using + + + +Valin, et al. Expires November 18, 2012 [Page 45] + +Internet-Draft Interactive Audio Codec May 2012 + + + the second PDF in Table 9. Table 10 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 9: Frame Type PDFs + + +------------+-------------+--------------------------+ + | Frame Type | Signal Type | Quantization Offset Type | + +------------+-------------+--------------------------+ + | 0 | Inactive | Low | + | | | | + | 1 | Inactive | High | + | | | | + | 2 | Unvoiced | Low | + | | | | + | 3 | Unvoiced | High | + | | | | + | 4 | Voiced | Low | + | | | | + | 5 | Voiced | High | + +------------+-------------+--------------------------+ + + Table 10: Signal Type and Quantization Offset Type from Frame Type + +4.2.7.4. Subframe 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 and unrelated to the pitch contours coded for + voiced frames. The 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. + + The subframe gains are either coded independently, or relative to the + gain from the most recent coded subframe in the same channel. + Independent coding is used if and only if + + + + + +Valin, et al. Expires November 18, 2012 [Page 46] + +Internet-Draft Interactive Audio Codec May 2012 + + + o This is the first subframe in the current SILK frame, and + + o Either + + * This is the first SILK frame of its type (LBRR or regular) for + this channel in the current Opus frame, or + + * The previous SILK frame of the same type (LBRR or regular) for + this channel in the same Opus frame was not coded. + + In an independently coded subframe gain, the 3 most significant bits + of the quantization gain are decoded using a PDF selected from + Table 11 based on the decoded signal type (see Section 4.2.7.3). + + +-------------+------------------------------------+ + | 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 11: 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 12: PDF for Independent Quantization Gain LSB Coding + + These 6 bits are combined to form a value, gain_index, between 0 and + 63. When the gain for the previous subframe is available, then the + current gain is limited as follows: + + log_gain = max(gain_index, previous_log_gain - 16) . + + This may help some implementations limit the change in precision of + their internal LTP history. The indices which this clamp applies to + cannot simply be removed from the codebook, because previous_log_gain + will not be available after packet loss. The clamping is skipped + after a decoder reset, and in the side channel if the previous frame + in the side channel was not coded, since there is no value for + + + +Valin, et al. Expires November 18, 2012 [Page 47] + +Internet-Draft Interactive Audio Codec May 2012 + + + previous_log_gain available. It MAY also be skipped after packet + loss. + + For subframes which do not have an independent gain (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 (in the same channel). The PDF in Table 13 yields + a delta_gain_index value 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 13: PDF for Delta Quantization Gain Coding + + The following formula translates this index into a quantization gain + for the current subframe using the gain from the previous subframe: + + log_gain = clamp(0, max(2*delta_gain_index - 16, + previous_log_gain + delta_gain_index - 4), 63) . + + silk_gains_dequant() (gain_quant.c) dequantizes log_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() (log2lin.c) computes an approximation 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 + + (1<>16)+f)*((1<>7) + + yields the approximate exponential. The final Q16 gain values lies + between 81920 and 1686110208, inclusive (representing scale factors + of 1.25 to 25728, respectively). + +4.2.7.5. Normalized Line Spectral Frequency (LSF) and Linear Predictive + Coding (LPC) Coefficients + + A set of normalized Line Spectral Frequency (LSF) coefficients follow + the quantization gains in the bitstream, and represent the Linear + Predictive Coding (LPC) coefficients for the current SILK frame. + Once decoded, the normalized LSFs form an increasing list of Q15 + + + +Valin, et al. Expires November 18, 2012 [Page 48] + +Internet-Draft Interactive Audio Codec May 2012 + + + values between 0 and 1. These represent the interleaved zeros on the + upper half of the unit circle (between 0 and pi, hence "normalized") + in the standard decomposition [line-spectral-pairs] of the LPC filter + into a symmetric part and an anti-symmetric part (P and Q in + Section 4.2.7.5.6). 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) + (Section 4.2.7.5.1 and Section 4.2.7.5.2). NB and MB frames use an + order-10 predictor, while WB frames use an order-16 predictor, and + thus have different sets of tables. After reconstructing the + normalized LSFs (Section 4.2.7.5.3), the decoder runs them through a + stabilization process (Section 4.2.7.5.4), interpolates them between + frames (Section 4.2.7.5.5), converts them back into LPC coefficients + (Section 4.2.7.5.6), and then runs them through further processes to + limit the range of the coefficients (Section 4.2.7.5.7) and the gain + of the filter (Section 4.2.7.5.8). All of this is necessary to + ensure the reconstruction process is stable. + +4.2.7.5.1. Normalized LSF Stage 1 Decoding + + The first VQ stage uses a 32-element codebook, coded with one of the + PDFs in Table 14, depending on the audio bandwidth and the signal + type of the current SILK frame. This yields a single index, I1, for + the entire frame, which + + 1. Indexes an element in a coarse codebook, + + 2. Selects the PDFs for the second stage of the VQ, and + + 3. Selects the prediction weights used to remove intra-frame + redundancy from the second stage. + + The actual codebook elements are listed in Table 23 and Table 24, but + they are not needed until the last stages of reconstructing the LSF + coefficients. + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 49] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-----------+----------+--------------------------------------------+ + | 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 14: PDFs for Normalized LSF Stage-1 Index Decoding + +4.2.7.5.2. Normalized LSF Stage 2 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 15, and the + 8 (i...p) for WB frames given in Table 16. Which PDF is used for + which coefficient is driven by the index, I1, decoded in the first + stage. Table 17 lists the letter of the corresponding PDF for each + normalized LSF coefficient for NB and MB, and Table 18 lists the same + information for WB. + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 50] + +Internet-Draft Interactive Audio Codec May 2012 + + + +----------+--------------------------------------+ + | 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 15: PDFs for NB/MB Normalized LSF Stage-2 Index 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 16: PDFs for WB Normalized LSF Stage-2 Index Decoding + + +----+---------------------+ + | I1 | Coefficient | + +----+---------------------+ + | | 0 1 2 3 4 5 6 7 8 9 | + + + +Valin, et al. Expires November 18, 2012 [Page 51] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 November 18, 2012 [Page 52] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 17: Codebook Selection for NB/MB Normalized LSF Stage-2 Index + 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 | + | | | + | 10 | 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 November 18, 2012 [Page 53] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 18: Codebook Selection for WB Normalized LSF Stage-2 Index + 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 17 or Table 18, and subtracts 4 from the + result to give an index in the range -4 to 4, inclusive. If the + + + +Valin, et al. Expires November 18, 2012 [Page 54] + +Internet-Draft Interactive Audio Codec May 2012 + + + index is either -4 or 4, it reads a second symbol using the PDF in + Table 19, 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 19: PDF for Normalized LSF Index Extension Decoding + + The decoded indices from both stages are translated back into + normalized LSF coefficients in silk_NLSF_decode() (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 20 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 November 18, 2012 [Page 55] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-------------+-----+-----+-----+-----+ + | 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 20: Prediction Weights for Normalized LSF Decoding + + The prediction is undone using the procedure implemented in + silk_NLSF_residual_dequant() (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 21 gives the selections + for each coefficient for NB and MB, and Table 22 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 November 18, 2012 [Page 56] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 November 18, 2012 [Page 57] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 | B 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 21: 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 C D 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 November 18, 2012 [Page 58] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 November 18, 2012 [Page 59] + +Internet-Draft Interactive Audio Codec May 2012 + + + Table 22: Prediction Weight Selection for WB Normalized LSF Decoding + +4.2.7.5.3. Reconstructing the Normalized LSF Coefficients + + Once the stage-1 index I1 and the stage-2 residual res_Q10[] have + been decoded, the final normalized LSF coefficients can be + reconstructed. + + The spectral distortion introduced by the quantization of each LSF + coefficient varies, so the stage-2 residual is weighted accordingly, + using the low-complexity Inverse Harmonic Mean Weighting (IHMW) + 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 23 or Table 24. 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 + 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 constant 46214 here is approximately the square root of 2 in Q15. + 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, inclusive) to avoid computing them when decoding. The + reference implementation already requires code to compute these + weights on unquantized coefficients in the encoder, in + silk_NLSF_VQ_weights_laroia() (NLSF_VQ_weights_laroia.c) and its + callers, so it reuses that code in the decoder instead of using a + pre-computed table to reduce the amount of ROM required. + + +----+----------------------------------------+ + | I1 | Codebook (Q8) | + +----+----------------------------------------+ + | | 0 1 2 3 4 5 6 7 8 9 | + | | | + | 0 | 12 35 60 83 108 132 157 180 206 228 | + | | | + + + +Valin, et al. Expires November 18, 2012 [Page 60] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 | + | | | + | 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 | + | | | + + + +Valin, et al. Expires November 18, 2012 [Page 61] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 | + | | | + | 30 | 24 30 52 84 131 150 166 186 203 229 | + | | | + | 31 | 37 48 64 84 104 118 156 177 201 230 | + +----+----------------------------------------+ + + Table 23: NB/MB Normalized LSF Stage-1 Codebook Vectors + + +----+------------------------------------------------------------+ + | I1 | Codebook (Q8) | + +----+------------------------------------------------------------+ + | | 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 | + | | | + + + +Valin, et al. Expires November 18, 2012 [Page 62] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 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 | + | | | + | 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 24: WB Normalized LSF Stage-1 Codebook Vectors + + 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] = clamp(0, + (cb1_Q8[k]<<7) + (res_Q10[k]<<14)/w_Q9[k], 32767) , + + + + +Valin, et al. Expires November 18, 2012 [Page 63] + +Internet-Draft Interactive Audio Codec May 2012 + + + where the division is integer division. However, nothing in either + the reconstruction process or the quantization process in the encoder + thus far guarantees that the coefficients are monotonically + increasing and separated well enough to ensure a stable filter + [Kabal86]. When using the reference encoder, roughly 2% of frames + violate this constraint. The next section describes a stabilization + procedure used to make these guarantees. + +4.2.7.5.4. Normalized LSF Stabilization + + The normalized LSF stabilization procedure is implemented in + silk_NLSF_stabilize() (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 25 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 November 18, 2012 [Page 64] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-------------+-----------+-----+ + | 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 25: 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 25. First, the procedure finds the index + + + +Valin, et al. Expires November 18, 2012 [Page 65] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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_Q15[i]>>1) + \ NDeltaMin_Q15[k] + /_ + k=0 + d_LPC + __ + max_center_Q15 = 32768 - (NDeltaMin_Q15[i]>>1) - \ NDeltaMin_Q15[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 either executed 20 + times or has stopped because the coefficients satisfy all the + constraints. + + After the 20th repetition of the above procedure, 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]) . + +4.2.7.5.5. Normalized LSF Interpolation + + For 20 ms SILK frames, the first half of the frame (i.e., the first + two subframes) may use normalized LSF coefficients that are + interpolated between the decoded LSFs for the most recent coded frame + + + +Valin, et al. Expires November 18, 2012 [Page 66] + +Internet-Draft Interactive Audio Codec May 2012 + + + (in the same channel) and the current frame. A Q2 interpolation + factor follows the LSF coefficient indices in the bitstream, which is + decoded using the PDF in Table 26. This happens in + silk_decode_indices() (decode_indices.c). After either + + o An uncoded regular SILK frame in the side channel, or + + o A decoder reset (see Section 4.5.2), + + 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 26: PDF for Normalized LSF Interpolation Index + + Let n2_Q15[k] be the normalized LSF coefficients decoded by the + procedure in Section 4.2.7.5, 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() + (decode_parameters.c). + +4.2.7.5.6. Converting Normalized LSFs to LPC Coefficients + + 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 + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 67] + +Internet-Draft Interactive Audio Codec May 2012 + + + -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. + 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() + (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 the true inverse of the + cosine function, when deriving the normalized LSF coefficients. + These values are also re-ordered to improve numerical accuracy when + constructing the LPC polynomials. + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 68] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-------------+-----------+----+ + | Coefficient | NB and MB | WB | + +-------------+-----------+----+ + | 0 | 0 | 0 | + | | | | + | 1 | 9 | 15 | + | | | | + | 2 | 6 | 8 | + | | | | + | 3 | 3 | 7 | + | | | | + | 4 | 4 | 4 | + | | | | + | 5 | 5 | 11 | + | | | | + | 6 | 8 | 12 | + | | | | + | 7 | 1 | 3 | + | | | | + | 8 | 2 | 2 | + | | | | + | 9 | 7 | 13 | + | | | | + | 10 | | 10 | + | | | | + | 11 | | 5 | + | | | | + | 12 | | 6 | + | | | | + | 13 | | 9 | + | | | | + | 14 | | 14 | + | | | | + | 15 | | 1 | + +-------------+-----------+----+ + + Table 27: LSF Ordering for Polynomial Evaluation + + 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 re-ordered, + approximated cosine, c_Q17[ordering[k]], is + + c_Q17[ordering[k]] = (cos_Q12[i]*256 + + (cos_Q12[i+1]-cos_Q12[i])*f + 4) >> 3 , + + where ordering[k] is the k'th entry of the column of Table 27 + + + +Valin, et al. Expires November 18, 2012 [Page 69] + +Internet-Draft Interactive Audio Codec May 2012 + + + corresponding to the current audio bandwidth and cos_Q12[i] is the + i'th entry of Table 28. + + +-----+-------+-------+-------+-------+ + | i | +0 | +1 | +2 | +3 | + +-----+-------+-------+-------+-------+ + | 0 | 4096 | 4095 | 4091 | 4085 | + | | | | | | + | 4 | 4076 | 4065 | 4052 | 4036 | + | | | | | | + | 8 | 4017 | 3997 | 3973 | 3948 | + | | | | | | + | 12 | 3920 | 3889 | 3857 | 3822 | + | | | | | | + | 16 | 3784 | 3745 | 3703 | 3659 | + | | | | | | + | 20 | 3613 | 3564 | 3513 | 3461 | + | | | | | | + | 24 | 3406 | 3349 | 3290 | 3229 | + | | | | | | + | 28 | 3166 | 3102 | 3035 | 2967 | + | | | | | | + | 32 | 2896 | 2824 | 2751 | 2676 | + | | | | | | + | 36 | 2599 | 2520 | 2440 | 2359 | + | | | | | | + | 40 | 2276 | 2191 | 2106 | 2019 | + | | | | | | + | 44 | 1931 | 1842 | 1751 | 1660 | + | | | | | | + | 48 | 1568 | 1474 | 1380 | 1285 | + | | | | | | + | 52 | 1189 | 1093 | 995 | 897 | + | | | | | | + | 56 | 799 | 700 | 601 | 501 | + | | | | | | + | 60 | 401 | 301 | 201 | 101 | + | | | | | | + | 64 | 0 | -101 | -201 | -301 | + | | | | | | + | 68 | -401 | -501 | -601 | -700 | + | | | | | | + | 72 | -799 | -897 | -995 | -1093 | + | | | | | | + | 76 | -1189 | -1285 | -1380 | -1474 | + | | | | | | + | 80 | -1568 | -1660 | -1751 | -1842 | + | | | | | | + + + +Valin, et al. Expires November 18, 2012 [Page 70] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 84 | -1931 | -2019 | -2106 | -2191 | + | | | | | | + | 88 | -2276 | -2359 | -2440 | -2520 | + | | | | | | + | 92 | -2599 | -2676 | -2751 | -2824 | + | | | | | | + | 96 | -2896 | -2967 | -3035 | -3102 | + | | | | | | + | 100 | -3166 | -3229 | -3290 | -3349 | + | | | | | | + | 104 | -3406 | -3461 | -3513 | -3564 | + | | | | | | + | 108 | -3613 | -3659 | -3703 | -3745 | + | | | | | | + | 112 | -3784 | -3822 | -3857 | -3889 | + | | | | | | + | 116 | -3920 | -3948 | -3973 | -3997 | + | | | | | | + | 120 | -4017 | -4036 | -4052 | -4065 | + | | | | | | + | 124 | -4076 | -4085 | -4091 | -4095 | + | | | | | | + | 128 | -4096 | | | | + +-----+-------+-------+-------+-------+ + + Table 28: Q12 Cosine Table for LSF Conversion + + Given the list of cosine values, silk_NLSF2A_find_poly() (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 < k < d2 and 0 <= j <= k+1, + + p_Q16[k][j] = p_Q16[k-1][j] + p_Q16[k-1][j-2] + - ((c_Q17[2*k]*p_Q16[k-1][j-1] + 32768)>>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 + + + +Valin, et al. Expires November 18, 2012 [Page 71] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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. + +4.2.7.5.7. 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 largest, breaking ties by choosing the lowest + 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 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 + + + +Valin, et al. Expires November 18, 2012 [Page 72] + +Internet-Draft Interactive Audio Codec May 2012 + + + large. The upper bound on maxabs_Q12, 163838, was chosen because it + is equal to ((2**31 - 1) >> 14) + 32767, i.e., the largest value of + maxabs_Q12 that would not overflow the numerator in the equation + above when stored in a signed 32-bit integer. + + silk_bwexpander_32() (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: + + 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 coefficient still overflows a 16-bit integer. This + saturation is not performed if maxabs_Q12 drops to 32767 or less + prior to the 10th round. + +4.2.7.5.8. Limiting the Prediction Gain of the LPC Filter + + 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. 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 silk_LPC_inverse_pred_gain_QA() + (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 + + + +Valin, et al. Expires November 18, 2012 [Page 73] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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, silk_LPC_inverse_pred_gain_QA() approximates this using + fixed-point arithmetic to guarantee reproducible results across + platforms and implementations. Since small changes in the + coefficients can make a stable filter unstable, it takes the real Q12 + coefficients that will be used during reconstruction as input. Thus, + let + + a32_Q12[n] = (a32_Q17[n] + 16) >> 5 + + be the Q12 version of the LPC coefficients that will eventually be + used. As a simple initial check, the decoder computes the DC + response as + + d_PLC-1 + __ + DC_resp = \ a32_Q12[n] + /_ + n=0 + + and if DC_resp > 4096, the filter is unstable. + + Increasing the precision of these Q12 coefficients to Q24 for + intermediate computations allows more accurate computation of the + reflection coefficients, so the decoder initializes the recurrence + via + + a32_Q24[d_LPC-1][n] = a32_Q12[n] << 12 . + + Then for each k from d_LPC-1 down to 0, if + abs(a32_Q24[k][k]) > 16773022, the filter is unstable and the + recurrence stops. The constant 16773022 here is approximately + 0.99975 in Q24. Otherwise, row k-1 of a32_Q24 is computed from row k + as + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 74] + +Internet-Draft Interactive Audio Codec May 2012 + + + rc_Q31[k] = -a32_Q24[k][k] << 7 , + + div_Q30[k] = (1<<30) - (rc_Q31[k]*rc_Q31[k] >> 32) , + + b1[k] = ilog(div_Q30[k]) , + + b2[k] = b1[k] - 16 , + + (1<<29) - 1 + inv_Qb2[k] = ----------------------- , + div_Q30[k] >> (b2[k]+1) + + err_Q29[k] = (1<<29) + - ((div_Q30[k]<<(15-b2[k]))*inv_Qb2[k] >> 16) , + + gain_Qb1[k] = ((inv_Qb2[k] << 16) + + (err_Q29[k]*inv_Qb2[k] >> 13)) , + + num_Q24[k-1][n] = a32_Q24[k][n] + - ((a32_Q24[k][k-n-1]*rc_Q31[k] + (1<<30)) >> 31) , + + a32_Q24[k-1][n] = (num_Q24[k-1][n]*gain_Qb1[k] + + (1<<(b1[k]-1))) >> b1[k] , + + where 0 <= n < k. Here, rc_Q30[k] are the reflection coefficients. + div_Q30[k] is the denominator for each iteration, and gain_Qb1[k] is + its multiplicative inverse (with b1[k] fractional bits, where b1[k] + ranges from 20 to 31). inv_Qb2[k], which ranges from 16384 to 32767, + is a low-precision version of that inverse (with b2[k] fractional + bits). err_Q29[k] is the residual error, ranging from -32763 to + 32392, which is used to improve the accuracy. The values + t_Q24[k-1][n] for each n are the numerators for the next row of + coefficients in the recursion, and a32_Q24[k-1][n] is the final + version of that row. Every multiply in this procedure except the one + used to compute gain_Qb1[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_Q24[k][k]) <= 16773022 for 0 <= k < d_LPC, then the filter + is considered stable. However, the problem of determining stability + is ill-conditioned when the filter contains several reflection + coefficients whose magnitude is very close to one. This fixed-point + algorithm is not mathematically guaranteed to correctly classify + filters as stable or unstable in this case, though it does very well + in practice. + + On round i, 1 <= i <= 18, if the filter passes these stability + + + +Valin, et al. Expires November 18, 2012 [Page 75] + +Internet-Draft Interactive Audio Codec May 2012 + + + checks, then this procedure stops, and the final LPC coefficients to + use for reconstruction in Section 4.2.7.9.2 are + + a_Q12[k] = (a32_Q17[k] + 16) >> 5 . + + Otherwise, a round of bandwidth expansion is applied using the same + procedure as in Section 4.2.7.5.7, with + + sc_Q16[0] = 65536 - (2<| decoder |----+ + | +---------+ | + | | + | +---------+ v + | | Fine | +---+ + +->| decoder |->| + | + | +---------+ +---+ + | ^ | + +---------+ | | | + | Range | | +----------+ v + | Decoder |-+ | Bit | +------+ + +---------+ | |Allocation| | 2**x | + | +----------+ +------+ + | | | + | v v +--------+ + | +---------+ +---+ +-------+ | pitch | + +->| PVQ |->| * |->| IMDCT |->| post- |---> + | | decoder | +---+ +-------+ | filter | + | +---------+ +--------+ + | ^ + +--------------------------------------+ + + Figure 17: Structure of the CELT decoder + + The decoder is based on the following symbols and sets of symbols: + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 108] + +Internet-Draft Interactive Audio Codec May 2012 + + + +---------------+-----------------------------------+---------------+ + | 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 | + | | | | + | finalize | Section 4.3.2 | | + +---------------+-----------------------------------+---------------+ + + Table 56: Order of the Symbols in the CELT Section of the Bitstream + + + +Valin, et al. Expires November 18, 2012 [Page 109] + +Internet-Draft Interactive Audio Codec May 2012 + + + The decoder extracts information from the range-coded bitstream in + the order described in Table 56. 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. Such out of range errors cannot occur in the + SILK layer. + +4.3.1. Transient Decoding + + The "transient" flag indicates whether the frame uses a single long + MDCT or several short MDCTs. 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. + The flag is encoded in the bitstream with a probability of 1/8. 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 + spectral 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 + decoder first reads the intra flag to determine what prediction is + used. The 2-D z-transform [z-transform] of the prediction filter is: + + + + + + +Valin, et al. Expires November 18, 2012 [Page 110] + +Internet-Draft Interactive Audio Codec May 2012 + + + -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 always remain in the same state as + floating point implementations. 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. These parameters are held in the e_prob_model table in + quant_bands.c. 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 bits are left after this, they + are left unused. This is implemented in unquant_energy_finalise() + (quant_bands.c). + + + + + + +Valin, et al. Expires November 18, 2012 [Page 111] + +Internet-Draft Interactive Audio Codec May 2012 + + +4.3.3. Bit Allocation + + Because the bit allocation drives 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. + + The per-band gain-shape structure of the CELT layer ensures that + using the same number of bits for the spectral shape of a band in + every frame will result in a roughly constant signal-to-noise ratio + in that band. This results in coding noise that has the same + spectral envelope as the signal. The masking curve produced by a + standard psychoacoustic model also closely follows the spectral + envelope of the signal. This structure means that the ideal + allocation is more consistent from frame to frame than it is for + other codecs without an equivalent structure, and that a fixed + allocation provides fairly consistent perceptual + performance [Valin2010]. + + Many codecs transmit significant amounts of side information to + control the bit allocation within a frame. Often this control is + only indirect, and must be exercised carefully to achieve the desired + rate constraints. The CELT layer, however, can adapt over a very + wide range of rates, and thus has a large number of codebook sizes to + choose from for each band. Explicitly signaling the size of each of + these codebooks would impose considerable overhead, even though the + allocation is relatively static from frame to frame. This is because + all of the information required to compute these codebook sizes must + be derived from a single frame by itself, in order to retain + robustness to packet loss, so the signaling cannot take advantage of + knowledge of the allocation in neighboring frames. This problem is + exacerbated in low-latency (small frame size) applications, which + would include this overhead in every frame. + + For this reason, in the MDCT mode Opus uses a primarily implicit bit + allocation. The available bitstream 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 + + + +Valin, et al. Expires November 18, 2012 [Page 112] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + 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 two additional parameters potentially coded + as part of the allocation procedure: a parameter to allow the + selective elimination of allocation for the 'side' (i.e., intensity + stereo) in jointly coded bands, and a flag to deactivate joint coding + (i.e., dual stereo). 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, an 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 allocation process consists of the following steps: determining + the per-band maximum allocation vector, decoding the boosts, decoding + the tilt, determining the remaining capacity of 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 a per-band + shape allocation (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. + + + +Valin, et al. Expires November 18, 2012 [Page 113] + +Internet-Draft Interactive Audio Codec May 2012 + + + The "static" bit allocation (in 1/8 bits) for a quality q, excluding + the minimums, maximums, tilt and boosts, is equal to + channels*N*alloc[band][q]<>2, where alloc[][] is given in + Table 57 and LM=log2(frame_size/120). The allocation is obtained by + linearly interpolating between two values of q (in steps of 1/64) to + find the highest allocation that does not exceed the number of bits + remaining. + + Rows indicate the MDCT bands, columns are the different quality (q) + parameters. The units are 1/32 bit per MDCT bin. + + +---+----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ + | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | + +---+----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ + | 0 | 90 | 110 | 118 | 126 | 134 | 144 | 152 | 162 | 172 | 200 | + | | | | | | | | | | | | + | 0 | 80 | 100 | 110 | 119 | 127 | 137 | 145 | 155 | 165 | 200 | + | | | | | | | | | | | | + | 0 | 75 | 90 | 103 | 112 | 120 | 130 | 138 | 148 | 158 | 200 | + | | | | | | | | | | | | + | 0 | 69 | 84 | 93 | 104 | 114 | 124 | 132 | 142 | 152 | 200 | + | | | | | | | | | | | | + | 0 | 63 | 78 | 86 | 95 | 103 | 113 | 123 | 133 | 143 | 200 | + | | | | | | | | | | | | + | 0 | 56 | 71 | 80 | 89 | 97 | 107 | 117 | 127 | 137 | 200 | + | | | | | | | | | | | | + | 0 | 49 | 65 | 75 | 83 | 91 | 101 | 111 | 121 | 131 | 200 | + | | | | | | | | | | | | + | 0 | 40 | 58 | 70 | 78 | 85 | 95 | 105 | 115 | 125 | 200 | + | | | | | | | | | | | | + | 0 | 34 | 51 | 65 | 72 | 78 | 88 | 98 | 108 | 118 | 198 | + | | | | | | | | | | | | + | 0 | 29 | 45 | 59 | 66 | 72 | 82 | 92 | 102 | 112 | 193 | + | | | | | | | | | | | | + | 0 | 20 | 39 | 53 | 60 | 66 | 76 | 86 | 96 | 106 | 188 | + | | | | | | | | | | | | + | 0 | 18 | 32 | 47 | 54 | 60 | 70 | 80 | 90 | 100 | 183 | + | | | | | | | | | | | | + | 0 | 10 | 26 | 40 | 47 | 54 | 64 | 74 | 84 | 94 | 178 | + | | | | | | | | | | | | + | 0 | 0 | 20 | 31 | 39 | 47 | 57 | 67 | 77 | 87 | 173 | + | | | | | | | | | | | | + | 0 | 0 | 12 | 23 | 32 | 41 | 51 | 61 | 71 | 81 | 168 | + | | | | | | | | | | | | + | 0 | 0 | 0 | 15 | 25 | 35 | 45 | 55 | 65 | 75 | 163 | + | | | | | | | | | | | | + | 0 | 0 | 0 | 4 | 17 | 29 | 39 | 49 | 59 | 69 | 158 | + | | | | | | | | | | | | + + + +Valin, et al. Expires November 18, 2012 [Page 114] + +Internet-Draft Interactive Audio Codec May 2012 + + + | 0 | 0 | 0 | 0 | 12 | 23 | 33 | 43 | 53 | 63 | 153 | + | | | | | | | | | | | | + | 0 | 0 | 0 | 0 | 1 | 16 | 26 | 36 | 46 | 56 | 148 | + | | | | | | | | | | | | + | 0 | 0 | 0 | 0 | 0 | 10 | 15 | 20 | 30 | 45 | 129 | + | | | | | | | | | | | | + | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 20 | 104 | + +---+----+-----+-----+-----+-----+-----+-----+-----+-----+-----+ + + Table 57: CELT Static Allocation Table + + The maximum allocation vector is an approximation of the maximum + space that can be used by each band for a given mode. The value is + 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: bitstream 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 + implementation, the maximums in bits/sample are precomputed in a + static table (see cache_caps50[] in static_modes_float.h) for each + band, for each value of LM, and for both mono and stereo. + 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 set + N to the number of MDCT bins covered by the band (for one channel), + set LM to the shift value for the frame size, 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 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 entropy 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 (probability p=1/64), 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 bits, or p=1/4). Since the + initial cost of coding a boost is 6 bits, the coding cost of the + + + +Valin, et al. Expires November 18, 2012 [Page 115] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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), the boost quanta in units of 1/8 bit is calculated as + quanta = min(8*N, max(48, N)). This represents a boost step size of + six bits, subject to a lower limit of 1/8th bit/sample and an upper + limit of 1 bit/sample. Set 'boost' to zero and 'dynalloc_loop_logp' + to dynalloc_logp. While dynalloc_loop_log (the 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 + executed on all bands, the band boosts have been decoded. This + procedure is implemented around line 2474 of celt.c. + + At very low rates it is 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 around line 1304 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 if and only if 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), decode the + trim value using the PDF in Table 58. + + + + + + +Valin, et al. Expires November 18, 2012 [Page 116] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-----------------------------------------------+ + | PDF | + +-----------------------------------------------+ + | {1, 1, 2, 5, 10, 22, 46, 22, 10, 5, 2, 2}/128 | + +-----------------------------------------------+ + + Table 58: PDF for the Trim + + For 10 ms and 20 ms frames using short blocks and that have at least + LM+2 bits left prior to the allocation process, then one anti- + collapse bit is reserved in the allocation process so it can be + decoded later. Following the the anti-collapse reservation, one bit + is reserved for skip if available. + + For stereo frames, bits are reserved for intensity stereo and for + dual stereo. Intensity stereo requires ilog2(end-start) bits. Those + bits are reserved if there is enough bits left. Following this, one + bit is reserved for dual stereo if available. + + The allocation computation begins by setting up some initial + conditions. 'total' is set to the remaining available 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 ensure that the resulting allocation will be + conservative. 'anti_collapse_rsv' is set to 8 (8th bits) if and only + if 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. + + 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 in rate.c). 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 an excessively 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 + + + +Valin, et al. Expires November 18, 2012 [Page 117] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 the + number of channels, the number of MDCT bins in the shortest frame + size for this mode, the number of 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 Decoding + + 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. + +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 + nearest to the allocated value (rounding down if exactly halfway + between two values), not to exceed 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 codebook entries can be computed as explained + in Section 4.3.4.2. The difference between the number of bits + allocated and the number of bits used is accumulated to a "balance" + (initialized to zero) that helps adjust the allocation for the next + bands. One third of the balance is applied to the bit allocation of + each band to help achieve 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. + + + + +Valin, et al. Expires November 18, 2012 [Page 118] + +Internet-Draft Interactive Audio Codec May 2012 + + +4.3.4.2. PVQ Decoding + + Decoding of PVQ vectors is implemented in decode_pulses() (cwrs.c). + The unique codeword index is decoded as a uniformly-distributed + integer value between 0 and V(N,K)-1, where V(N,K) is the number of + possible combinations of K pulses in N samples. The index is then + converted to a vector in the same way specified in [PVQ]. The + indexing is based on the calculation of V(N,K) (denoted N(L,K) in + [PVQ]). + + 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 + precomputed 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 decoded vector X is recovered as follows. Let i be the index + decoded with the procedure in Section 4.1.5 with ft = V(N,K), so that + 0 <= i < V(N,K). Let k = K. Then for j = 0 to (N - 1), inclusive, + do: + + 1. Let p = (V(N-j-1,k) + V(N-j,k))/2. + + 2. If i < p, then let sgn = 1, else let sgn = -1 and set i = i - p. + + 3. Let k0 = k and set p = p - V(N-j-1,k). + + 4. While p > i, set k = k - 1 and p = p - V(N-j-1,k). + + 5. Set X[j] = sgn*(k0 - k) and i = i - p. + + The decoded vector X is then normalized such that its L2-norm equals + one. + +4.3.4.3. Spreading + + The normalized vector decoded in Section 4.3.4.2 is then rotated for + the purpose of avoiding tonal artifacts. The rotation gain is equal + to + + g_r = N / (N + f_r*K) + + + + +Valin, et al. Expires November 18, 2012 [Page 119] + +Internet-Draft Interactive Audio Codec May 2012 + + + where N is the number of dimensions, K is the number of pulses, and + f_r depends on the value of the "spread" parameter in the bit-stream. + + +--------------+------------------------+ + | Spread value | f_r | + +--------------+------------------------+ + | 0 | infinite (no rotation) | + | | | + | 1 | 15 | + | | | + | 2 | 10 | + | | | + | 3 | 5 | + +--------------+------------------------+ + + Table 59: Spreading Values + + The rotation angle is then calculated as + + 2 + pi * g_r + theta = ---------- + 4 + + A 2-D rotation R(i,j) between points x_i and x_j is defined as: + + x_i' = cos(theta)*x_i + sin(theta)*x_j + x_j' = -sin(theta)*x_i + cos(theta)*x_j + + An N-D rotation is then achieved by applying a series of 2-D + rotations back and forth, in the following order: R(x_1, x_2), R(x_2, + x_3), ..., R(x_N-2, X_N-1), R(x_N-1, X_N), R(x_N-2, X_N-1), ..., + R(x_1, x_2). + + If the decoded vector represents more than one time block, then this + spreading process is applied separately on each time block. Also, if + each block represents 8 samples or more, then another N-D rotation, + by (pi/2-theta), is applied _before_ the rotation described above. + This extra rotation is applied in an interleaved manner with a stride + equal to round(sqrt(N/nb_blocks)), i.e., it is applied independently + for each set of sample S_k = {stride*n + k}, n=0..N/stride-1. + +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- + vectors of size N/2. A quantized gain parameter with precision + + + +Valin, et al. Expires November 18, 2012 [Page 120] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 limit of LM+1 splits. The same recursive mechanism + is applied for the joint coding of stereo audio. + +4.3.4.5. Time-Frequency change + + The time-frequency (TF) parameters are used to control the time- + frequency resolution tradeoff in each coded band. For each band, + there are two possible TF choices. For the first band coded, the PDF + is {3, 1}/4 for frames marked as transient and {15, 1}/16 for the + other frames. For subsequent bands, the TF choice is coded relative + to the previous TF choice with probability {15, 1}/15 for transient + frames and {31, 1}/32 otherwise. The mapping between the decoded TF + choices and the adjustment in TF resolution is shown in the tables + below. + + +-----------------+---+----+ + | Frame size (ms) | 0 | 1 | + +-----------------+---+----+ + | 2.5 | 0 | -1 | + | | | | + | 5 | 0 | -1 | + | | | | + | 10 | 0 | -2 | + | | | | + | 20 | 0 | -2 | + +-----------------+---+----+ + + Table 60: TF Adjustments for Non-transient Frames and tf_select=0 + + +-----------------+---+----+ + | Frame size (ms) | 0 | 1 | + +-----------------+---+----+ + | 2.5 | 0 | -1 | + | | | | + | 5 | 0 | -2 | + | | | | + | 10 | 0 | -3 | + | | | | + | 20 | 0 | -3 | + +-----------------+---+----+ + + Table 61: TF Adjustments for Non-transient Frames and tf_select=1 + + + + + + +Valin, et al. Expires November 18, 2012 [Page 121] + +Internet-Draft Interactive Audio Codec May 2012 + + + +-----------------+---+----+ + | Frame size (ms) | 0 | 1 | + +-----------------+---+----+ + | 2.5 | 0 | -1 | + | | | | + | 5 | 1 | 0 | + | | | | + | 10 | 2 | 0 | + | | | | + | 20 | 3 | 0 | + +-----------------+---+----+ + + Table 62: TF Adjustments for Transient Frames and tf_select=0 + + +-----------------+---+----+ + | Frame size (ms) | 0 | 1 | + +-----------------+---+----+ + | 2.5 | 0 | -1 | + | | | | + | 5 | 1 | -1 | + | | | | + | 10 | 1 | -1 | + | | | | + | 20 | 1 | -1 | + +-----------------+---+----+ + + Table 63: TF Adjustments for Transient Frames and tf_select=1 + + A negative TF adjustment means that the temporal resolution is + increased, while a positive TF adjustment means that the frequency + resolution is increased. Changes in TF resolution are implemented + using the Hadamard transform [Hadamard]. To increase the time + resolution by N, N "levels" of the Hadamard transform are applied to + the decoded vector for each interleaved MDCT vector. To increase the + frequency resolution (assumes a transient frame), then N levels of + the Hadamard transform are applied _across_ the interleaved MDCT + vector. In the case of increased time resolution the decoder uses + the "sequency order" because the input vector is sorted in time. + +4.3.5. Anti-Collapse Processing + + The anti-collapse feature is designed to avoid the situation where + the use of multiple short MDCTs causes the energy in one or more of + the MDCTs to be zero for some bands, causing unpleasant artifacts. + When the frame has the transient bit set, an anti-collapse bit is + decoded. When anti-collapse is set, 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 + + + +Valin, et al. Expires November 18, 2012 [Page 122] + +Internet-Draft Interactive Audio Codec May 2012 + + + energy corresponding to the minimum 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 as 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. A "low-overlap" window reduces the + algorithmic delay. It is derived from a basic (full overlap) 240- + sample version of the window used by the Vorbis codec: + + 2 + / /pi /pi n + 1/2\ \ \ + 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 [Princen86]. The IMDCT and + windowing are performed by mdct_backward (mdct.c). + +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< S -> S + & + !R -> R + & + ;S -> S -> S + + NB or MB SILK to Hybrid with Redundancy: S -> S -> S + & + !R ->;H -> H -> H + + WB SILK to Hybrid: S -> S -> S ->!H -> H -> H + + SILK to CELT with Redundancy: S -> S -> S + & + !R -> C -> C -> C + + Hybrid to NB or MB SILK with Redundancy: H -> H -> H + & + !R -> R + & + ;S -> S -> S + + Hybrid to WB SILK: H -> H -> H -> c + \ + + > S -> S -> S + + Hybrid to CELT with Redundancy: H -> H -> H + & + !R -> C -> C -> C + + CELT to SILK with Redundancy: C -> C -> C -> R + & + ;S -> S -> S + + CELT to Hybrid with Redundancy: C -> C -> C -> R + & + |H -> H -> H + + Key: + S SILK-only frame ; SILK decoder reset + H Hybrid frame | CELT and SILK decoder resets + C CELT-only frame ! CELT decoder reset + c CELT overlap + Direct mixing + R Redundant CELT frame & Windowed cross-lap + + Figure 18: Normative Transitions + + The first two and the last two Opus frames in each example are + + + +Valin, et al. Expires November 18, 2012 [Page 130] + +Internet-Draft Interactive Audio Codec May 2012 + + + illustrative, i.e., there is no requirement that a stream remain in + the same configuration for three consecutive frames before or after a + switch. + + The behavior of transitions without redundancy where PLC is allowed + is non-normative. An encoder might still wish to use these + transitions if, for example, it doesn't want to add the extra bitrate + required for redundancy or if it makes a decision to switch after it + has already transmitted the frame that would have had to contain the + redundancy. Figure 19 illustrates the recommended cross-lapping and + decoder resets for these transitions. + + SILK to SILK (audio bandwidth change): S -> S -> S ;S -> S -> S + + NB or MB SILK to Hybrid: S -> S -> S |H -> H -> H + + SILK to CELT without Redundancy: S -> S -> S -> P + & + !C -> C -> C + + Hybrid to NB or MB SILK: H -> H -> H -> c + + + ;S -> S -> S + + Hybrid to CELT without Redundancy: H -> H -> H -> P + & + !C -> C -> C + + CELT to SILK without Redundancy: C -> C -> C -> P + & + ;S -> S -> S + + CELT to Hybrid without Redundancy: C -> C -> C -> P + & + |H -> H -> H + + Key: + S SILK-only frame ; SILK decoder reset + H Hybrid frame | CELT and SILK decoder resets + C CELT-only frame ! CELT decoder reset + c CELT overlap + Direct mixing + P Packet Loss Concealment & Windowed cross-lap + + Figure 19: Recommended Non-Normative Transitions + + Encoders SHOULD NOT use other transitions, e.g., those that involve + redundancy in ways not illustrated in Figure 18. + + + + +Valin, et al. Expires November 18, 2012 [Page 131] + +Internet-Draft Interactive Audio Codec May 2012 + + +5. Opus Encoder + + Just like the decoder, the Opus encoder also normally consists of two + main blocks: the SILK encoder and the CELT encoder. However, unlike + the case of the decoder, a valid (though potentially suboptimal) Opus + encoder is not required to support all modes and may thus only + include a SILK encoder module or a CELT encoder module. The output + bit-stream of the Opus encoding contains bits from the SILK and CELT + encoders, though these are not separable due to the use of a range + coder. A block diagram of the encoder is illustrated below. + + + +------------+ +---------+ + | Sample | | SILK |------+ + +->| Rate |--->| Encoder | V + +-----------+ | | Conversion | | | +---------+ + | Optional | | +------------+ +---------+ | Range | + ->| High-pass |--+ | Encoder |----> + | Filter | | +--------------+ +---------+ | | Bit- + +-----------+ | | Delay | | CELT | +---------+ stream + +->| Compensation |->| Encoder | ^ + | | | |------+ + +--------------+ +---------+ + + + Figure 20: Opus Encoder + + For a normal encoder where both the SILK and the CELT modules are + included, an optimal encoder should select which coding mode to use + at run-time depending on the conditions. In the reference + implementation, the frame size is selected by the application, but + the other configuration parameters (number of channels, bandwidth, + mode) are automatically selected (unless explicitly overridden by the + application) depend on the following: + + o Requested bitrate + + o Input sampling rate + + o Type of signal (speech vs music) + + o Frame size in use + + The type of signal currently needs to be provided by the application + (though it can be changed in real-time). An Opus encoder + implementation could also do automatic detection, but since Opus is + an interactive codec, such an implementation would likely have to + either delay the signal (for non-interactive applications) or delay + + + +Valin, et al. Expires November 18, 2012 [Page 132] + +Internet-Draft Interactive Audio Codec May 2012 + + + the mode switching decisions (for interactive applications). + + When the encoder is configured for voice over IP applications, 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 Auto Regressive + Moving Average (i.e., with poles and zeros) filter with a cut-off + frequency around 50 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. + +5.1. Range Encoder + + The range coder 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 (ft - 1) (where ft 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 (val, rng, rem, ext) representing the low end of the + current range, the size of the current range, a single buffered + output byte, and a count of additional carry-propagating output + bytes. Both val and rng are 32-bit unsigned integer values, rem is a + byte value or less than 255 or the special value -1, and ext is an + unsigned integer with at least 11 bits. This state vector is + initialized at the start of each each frame to the value + (0, 2**31, -1, 0). After encoding a sequence of symbols, the value + of rng in the encoder should exactly match the value of rng in the + decoder after decoding the same sequence of symbols. This is a + powerful tool for detecting errors in either an encoder or decoder + implementation. The value of val, on the other hand, represents + different things in the encoder and decoder, and is not expected to + match. + + The decoder has no analog for rem and ext. These are used to perform + carry propagation in the renormalization loop below. Each iteration + of this loop produces 9 bits of output, consisting of 8 data bits and + a carry flag. The encoder cannot determine the final value of the + output bytes until it propagates these carry flags. Therefore the + reference implementation buffers a single non-propagating output byte + (i.e., one less than 255) in rem and keeps a count of additional + + + +Valin, et al. Expires November 18, 2012 [Page 133] + +Internet-Draft Interactive Audio Codec May 2012 + + + propagating (i.e., 255) output bytes in ext. An implementation may + choose to use any mathematically equivalent scheme to perform carry + propagation. + +5.1.1. Encoding Symbols + + The main encoding function is ec_encode() (entenc.c), which encodes + symbol k in the current context using the same three-tuple + (fl[k], fh[k], ft) as the decoder to describe the range of the symbol + (see Section 4.1). + + ec_encode() updates the state of the encoder as follows. If fl[k] is + greater than zero, then + + rng + val = val + rng - --- * (ft - fl) , + ft + + rng + rng = --- * (fh - fl) . + ft + + Otherwise, val is unchanged and + + rng + rng = rng - --- * (fh - fl) . + ft + + The divisions here are integer division. + +5.1.1.1. Renormalization + + After this update, the range is normalized using a procedure very + similar to that of Section 4.1.2.1, implemented by ec_enc_normalize() + (entenc.c). The following process is repeated until rng > 2**23. + First, the top 9 bits of val, (val>>23), are sent to the carry + buffer, described in Section 5.1.1.2. Then, the encoder sets + + val = (val<<8) & 0x7FFFFFFF , + + rng = rng<<8 . + +5.1.1.2. Carry Propagation and Output Buffering + + The function ec_enc_carry_out() (entenc.c) implements carry + propagation and output buffering. It takes as input a 9-bit value, + c, consisting of 8 data bits and an additional carry bit. If c is + equal to the value 255, then ext is simply incremented, and no other + + + +Valin, et al. Expires November 18, 2012 [Page 134] + +Internet-Draft Interactive Audio Codec May 2012 + + + state updates are performed. Otherwise, let b = (c>>8) be the carry + bit. Then, + + o If the buffered byte rem contains a value other than -1, the + encoder outputs the byte (rem + b). Otherwise, if rem is -1, no + byte is output. + + o If ext is non-zero, then the encoder outputs ext bytes---all with + a value of 0 if b is set, or 255 if b is unset---and sets ext to + 0. + + o rem is set to the 8 data bits: + + rem = c & 255 . + +5.1.2. Alternate Encoding Methods + + The reference implementation uses three additional encoding methods + that are exactly equivalent to the above, but make assumptions and + simplifications that allow for a more efficient implementation. + +5.1.2.1. ec_encode_bin() + + The first is ec_encode_bin() (entenc.c), defined using the parameter + ftb instead of ft. It is mathematically equivalent to calling + ec_encode() with ft = (1<>(ftb - 8), (t>>(ftb - 8)) + 1, + ((ft - 1)>>(ftb - 8)) + 1), and the remaining bits, + (t & ((1<<(ftb - 8)) - 1), are encoded as raw bits with + ec_enc_bits(). + +5.1.5. 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 [val, val + rng) with the largest number of trailing + zero bits, b, such that (end + (1<>23), are passed + to the carry buffer in accordance with the procedure in + Section 5.1.1.2, and end is updated via + + end = (end<<8) & 0x7FFFFFFF . + + Finally, if the buffered output byte, rem, is neither zero nor the + + + +Valin, et al. Expires November 18, 2012 [Page 136] + +Internet-Draft Interactive Audio Codec May 2012 + + + special value -1, or the carry count, ext, is greater than zero, then + 9 zero bits are sent to the carry buffer to flush it to the output + buffer. When outputting the final byte from the range coder, if it + would overlap any raw bits already packed into the end of the output + buffer, they should be ORed into the same byte. The bit allocation + routines in the CELT layer should ensure that this can be done + without corrupting the range coder data so long as end is chosen as + described above. If there is any space between the end of the range + coder data and the end of the raw bits, it is padded with zero bits. + This entire process is implemented by ec_enc_done() (entenc.c). + +5.1.6. 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 + 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 many respects the SILK encoder mirrors the SILK decoder described + in Section 4.2. Details such as the quantization and range coder + tables can be found there, while this section describes the high- + level design choices that were made. The diagram below shows the + basic modules of the SILK encoder. + + + +----------+ +--------+ +---------+ + | Sample | | Stereo | | SILK | + ------>| Rate |--->| Mixing |--->| Core |----------> + Input |Conversion| | | | Encoder | Bitstream + +----------+ +--------+ +---------+ + + + Figure 21: SILK Encoder + +5.2.1. Sample Rate Conversion + + The input signal's sampling rate is adjusted by a sample rate + conversion module so that it matches the SILK internal sampling rate. + The input to the sample rate converter is delayed by a number of + + + +Valin, et al. Expires November 18, 2012 [Page 137] + +Internet-Draft Interactive Audio Codec May 2012 + + + samples depending on the sample rate ratio, such that the overall + delay is constant for all input and output sample rates. + +5.2.2. Stereo Mixing + + The stereo mixer is only used for stereo input signals. It converts + a stereo left/right signal into an adaptive mid/side representation. + The first step is to compute non-adaptive mid/side signals as half + the sum and difference between left and right signals. The side + signal is then minimized in energy by subtracting a prediction of it + based on the mid signal. This prediction works well when the left + and right signals exhibit linear dependency, for instance for an + amplitude-panned input signal. Like in the decoder, the prediction + coefficients are linearly interpolated during the first 8 ms of the + frame. The mid signal is always encoded, whereas the residual side + signal is only encoded if it has sufficient energy compared to the + mid signal's energy. If it has not, the "mid_only_flag" is set + without encoding the side signal. + + The predictor coefficients are coded regardless of whether the side + signal is encoded. For each frame, two predictor coefficients are + computed, one that predicts between low-passed mid and side channels, + and one that predicts between high-passed mid and side channels. The + low-pass filter is a simple three-tap filter and creates a delay of + one sample. The high-pass filtered signal is the difference between + the mid signal delayed by one sample and the low-passed signal. + Instead of explicitly computing the high-passed signal, it is + computationally more efficient to transform the prediction + coefficients before applying them to the filtered mid signal, as + follows + + + pred(n) = LP(n) * w0 + HP(n) * w1 + = LP(n) * w0 + (mid(n-1) - LP(n)) * w1 + = LP(n) * (w0 - w1) + mid(n-1) * w1 + + + where w0 and w1 are the low-pass and high-pass prediction + coefficients, mid(n-1) is the mid signal delayed by one sample, LP(n) + and HP(n) are the low-passed and high-passed signals and pred(n) is + the prediction signal that is subtracted from the side signal. + +5.2.3. SILK Core Encoder + + What follows is a description of the core encoder and its components. + For simplicity, the core encoder is referred to simply as the encoder + in the remainder of this section. An overview of the encoder is + given in Figure 22. + + + +Valin, et al. Expires November 18, 2012 [Page 138] + +Internet-Draft Interactive Audio Codec May 2012 + + + +---+ + +--------------------------------->| | + +---------+ | +---------+ | | + |Voice | | |LTP |12 | | + +-->|Activity |--+ +----->|Scaling |-----------+---->| | + | |Detector |3 | | |Control |<--+ | | | + | +---------+ | | +---------+ | | | | + | | | +---------+ | | | | + | | | |Gains | | | | | + | | | +-->|Processor|---|---+---|---->| R | + | | | | | |11 | | | | a | + | \/ | | +---------+ | | | | n | + | +---------+ | | +---------+ | | | | g | + | |Pitch | | | |LSF | | | | | e | + | +->|Analysis |---+ | |Quantizer|---|---|---|---->| | + | | | |4 | | | |8 | | | | E |--> + | | +---------+ | | +---------+ | | | | n | 2 + | | | | 9/\ 10| | | | | c | + | | | | | \/ | | | | o | + | | +---------+ | | +----------+ | | | | d | + | | |Noise | +--|-->|Prediction|--+---|---|---->| e | + | +->|Shaping |---|--+ |Analysis |7 | | | | r | + | | |Analysis |5 | | | | | | | | | + | | +---------+ | | +----------+ | | | | | + | | | | /\ | | | | | + | | +----------|--|--------+ | | | | | + | | | \/ \/ \/ \/ \/ | | + | | | +---------+ +------------+ | | + | | | | | |Noise | | | + -+-------+-----+------>|Prefilter|--------->|Shaping |-->| | + 1 | | 6 |Quantization|13 | | + +---------+ +------------+ +---+ + + 1: Input speech signal + 2: Range encoded bitstream + 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 + + + +Valin, et al. Expires November 18, 2012 [Page 139] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + + + Figure 22: SILK Core Encoder + +5.2.3.1. Voice Activity Detection + + The input signal is processed by a Voice Activity Detector (VAD) to + produce a measure of voice activity, spectral tilt, and signal-to- + noise estimates for each frame. The VAD uses a sequence of half-band + filterbanks to split the signal into four subbands: 0...Fs/16, Fs/ + 16...Fs/8, Fs/8...Fs/4, and Fs/4...Fs/2, where Fs is the sampling + frequency (8, 12, 16, or 24 kHz). The lowest subband, from 0 - + Fs/16, is high-pass filtered with a first-order moving average (MA) + 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 a Signal-to-Noise Ratio (SNR) 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. + + 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. + +5.2.3.2. Pitch Analysis + + The input signal is processed by the open loop pitch estimator shown + in Figure 23. + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 140] + +Internet-Draft Interactive Audio Codec May 2012 + + + +--------+ +----------+ + |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 + + + Figure 23: Block diagram of the pitch estimator + + 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 + corresponding to 500 Hz, to a longest lag corresponding to 56 Hz. + + + + +Valin, et al. Expires November 18, 2012 [Page 141] + +Internet-Draft Interactive Audio Codec May 2012 + + + o The second stage operates on an 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. + +5.2.3.3. 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 + shaping quantizer, the levels of the spectral valleys can be + decreased relative to the levels of the spectral peaks such as + + + +Valin, et al. Expires November 18, 2012 [Page 142] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + + + Figure 24: Noise shaping and spectral de-emphasis illustration + + Figure 24 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. + + The transformation from input signal to de-emphasized signal can be + described as a filtering operation with a filter + + + + + +Valin, et al. Expires November 18, 2012 [Page 143] + +Internet-Draft Interactive Audio Codec May 2012 + + + -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 ms. First, an LPC analysis is performed on a windowed signal block + of 15 ms. The signal block has a look-ahead of 5 ms 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 between 8, in lowest-complexity mode, and 16, for best quality. + + Optionally the LPC analysis and noise shaping filters are warped by + replacing the delay elements by first-order allpass filters. This + increases the frequency resolution at low frequencies and reduces it + at high ones, which better matches the human auditory system and + improves quality. The warped analysis and filtering comes at a cost + in complexity and is therefore only done in higher complexity modes. + + The quantization gain is found by taking the square root of the + residual energy from the LPC analysis and multiplying it by a value + + + +Valin, et al. Expires November 18, 2012 [Page 144] + +Internet-Draft Interactive Audio Codec May 2012 + + + inversely proportional to the coding quality control parameter and + the pitch correlation. + + Next the two sets of short-term noise shaping coefficients a_ana(k) + and a_syn(k) are obtained 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 = 0.95 - 0.01*C, and + + g_syn = 0.95 + 0.01*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 + + + +Valin, et al. Expires November 18, 2012 [Page 145] + +Internet-Draft Interactive Audio Codec May 2012 + + + c_tilt = 0.25, + + + and as + + + c_tilt = 0.25 + 0.2625 * V + + + for voiced frames, where V is the voice activity level between 0 and + 1. + + The adjustment gain G serves to correct any level mismatch between + the original and decoded signals 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. + +5.2.3.4. 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 is described in Section 5.2.3.4.1 and + Section 5.2.3.4.2, respectively. Inputs to this function include the + pre-whitened signal from the pitch estimator (see Section 5.2.3.2). + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 146] + +Internet-Draft Interactive Audio Codec May 2012 + + +5.2.3.4.1. 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 quantized using the method + described in Section 5.2.3.6, and the quantized LTP coefficients are + used to compute the LTP residual signal. This LTP residual signal is + the input to an LPC analysis where the LPC coefficients are estimated + using Burg's method [Burg], such that the residual energy is + minimized. The estimated LPC coefficients are converted to a Line + Spectral Frequency (LSF) vector and quantized as described in + Section 5.2.3.5. After quantization, the quantized LSF vector is + converted back to LPC coefficients using the full procedure in + Section 4.2.7.5. By using quantized LTP coefficients and LPC + coefficients derived from the quantized LSF coefficients, the encoder + remains fully synchronized with the decoder. The quantized LPC and + LTP coefficients are also used to filter the input signal and measure + residual energy for each of the four subframes. + +5.2.3.4.2. 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 LTP analysis to be worth the cost in terms of + complexity and bitrate. The pre-whitened input signal is therefore + discarded, and instead the input signal is used for LPC analysis + using Burg's method. The resulting LPC coefficients are converted to + an LSF vector and quantized as described in the following section. + They are then transformed back to obtain quantized LPC coefficients, + which are then used to filter the input signal and measure residual + energy for each of the four subframes. + +5.2.3.4.2.1. Burg's Method + + The main purpose of linear prediction in SILK is to reduce the + bitrate by minimizing the residual energy. At least at high + bitrates, perceptual aspects are handled independently by the noise + shaping filter. Burg's method is used because it provides higher + prediction gain than the autocorrelation method and, unlike the + covariance method, produces stable filters (assuming numerical errors + don't spoil that). SILK's implementation of Burg's method is also + computationally faster than the autocovariance method. The + implementation of Burg's method differs from traditional + implementations in two aspects. The first difference is that it + + + +Valin, et al. Expires November 18, 2012 [Page 147] + +Internet-Draft Interactive Audio Codec May 2012 + + + operates on autocorrelations, similar to the Schur algorithm [Schur], + but with a simple update to the autocorrelations after finding each + reflection coefficient to make the result identical to Burg's method. + This brings down the complexity of Burg's method to near that of the + autocorrelation method. The second difference is that the signal in + each subframe is scaled by the inverse of the residual quantization + step size. Subframes with a small quantization step size will on + average spend more bits for a given amount of residual energy than + subframes with a large step size. Without scaling, Burg's method + minimizes the total residual energy in all subframes, which doesn't + necessarily minimize the total number of bits needed for coding the + quantized residual. The residual energy of the scaled subframes is a + better measure for that number of bits. + +5.2.3.5. LSF Quantization + + Unlike many other speech codecs, SILK uses variable bitrate coding + for the LSFs. This improves the average rate-distortion (R-D) + tradeoff and reduces outliers. The variable bitrate coding minimizes + a linear combination of the weighted quantization errors and the + bitrate. The weights for the quantization errors are the Inverse + Harmonic Mean Weighting (IHMW) function proposed by Laroia et al. + (see [laroia-icassp]). These weights are referred to here as Laroia + weights. + + The LSF quantizer consists of two stages. The first stage is an + (unweighted) vector quantizer (VQ), with a codebook size of 32 + vectors. The quantization errors for the codebook vector are sorted, + and for the N best vectors a second stage quantizer is run. By + varying the number N a tradeoff is made between R-D performance and + computational efficiency. For each of the N codebook vectors the + Laroia weights corresponding to that vector (and not to the input + vector) are calculated. Then the residual between the input LSF + vector and the codebook vector is scaled by the square roots of these + Laroia weights. This scaling partially normalizes error sensitivity + for the residual vector, so that a uniform quantizer with fixed step + sizes can be used in the second stage without too much performance + loss. And by scaling with Laroia weights determined from the first- + stage codebook vector, the process can be reversed in the decoder. + + The second stage uses predictive delayed decision scalar + quantization. The quantization error is weighted by Laroia weights + determined from the LSF input vector. The predictor multiplies the + previous quantized residual value by a prediction coefficient that + depends on the vector index from the first stage VQ and on the + location in the LSF vector. The prediction is subtracted from the + LSF residual value before quantizing the result, and added back + afterwards. This subtraction can be interpreted as shifting the + + + +Valin, et al. Expires November 18, 2012 [Page 148] + +Internet-Draft Interactive Audio Codec May 2012 + + + quantization levels of the scalar quantizer, and as a result the + quantization error of each value depends on the quantization decision + of the previous value. This dependency is exploited by the delayed + decision mechanism to search for a quantization sequency with best + R-D performance with a Viterbi-like algorithm [Viterbi]. The + quantizer processes the residual LSF vector in reverse order (i.e., + it starts with the highest residual LSF value). This is done because + the prediction works slightly better in the reverse direction. + + The quantization index of the first stage is entropy coded. The + quantization sequence from the second stage is also entropy coded, + where for each element the probability table is chosen depending on + the vector index from the first stage and the location of that + element in the LSF vector. + +5.2.3.5.1. LSF Stabilization + + If the input is stable, finding the best candidate usually results in + a quantized vector that is also stable. Because of the two-stage + approach, however, it is possible that the best quantization + candidate is unstable. The encoder applies the same stabilization + procedure applied by the decoder (see Section 4.2.7.5.4 to ensure the + LSF parameters are within their valid range, increasingly sorted, and + have minimum distances between each other and the border values. + +5.2.3.6. LTP Quantization + + For voiced frames, the prediction analysis described in + Section 5.2.3.4.1 resulted in four sets (one set per subframe) of + five LTP coefficients, plus four weighting matrices. 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 + 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. + + + +Valin, et al. Expires November 18, 2012 [Page 149] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 fluctuate relatively slowly, which + causes the W_ltp matrices for different subframes of one frame often + to be similar. Because of this, one of the three codebooks typically + gives good performance for all subframes, and 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. 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. + +5.2.3.7. Prefilter + + In the prefilter the input signal is filtered using the spectral + valley de-emphasis filter coefficients from the noise shaping + analysis (see Section 5.2.3.3). By applying only the noise shaping + analysis filter to the input signal, it provides the input to the + noise shaping quantizer. + +5.2.3.8. 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 + pulses that is input to the pyramid range encoder. The scalar + + + +Valin, et al. Expires November 18, 2012 [Page 150] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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. + + Optionally the noise shaping quantizer operates in a delayed decision + mode. In this mode it uses a Viterbi algorithm to keep track of + multiple rounding choices in the quantizer and select the best one + after a delay of 32 samples. This improves the rate/distortion + performance of the quantizer. + +5.2.3.9. Constant Bitrate Mode + + SILK was designed to run in Variable Bitrate (VBR) mode. However the + reference implementation also has a Constant Bitrate (CBR) mode for + SILK. In CBR mode SILK will attempt to encode each packet with no + more than the allowed number of bits. The Opus wrapper code then + pads the bitstream if any unused bits are left in SILK mode, or + encodes the high band with the remaining number of bits in Hybrid + mode. The number of payload bits is adjusted by changing the + quantization gains and the rate/distortion tradeoff in the noise + shaping quantizer, in an iterative loop around the noise shaping + quantizer and entropy coding. Compared to the SILK VBR mode, the CBR + mode has lower audio quality at a given average bitrate, and also has + higher computational complexity. + +5.3. CELT Encoder + + Most of the aspects of the CELT encoder can be directly derived from + the description of the decoder. For example, the filters and + rotations in the encoder are simply the inverse of the operation + performed by the decoder. Similarly, the quantizers generally + optimize for the mean square error (because noise shaping is part of + the bit-stream itself), so no special search is required. For this + reason, only the less straightforward aspects of the encoder are + described here. + +5.3.1. Pitch Prefilter + + The pitch prefilter is applied after the pre-emphasis. It is applied + in such a way as to be the inverse of the decoder's post-filter. The + main non-obvious aspect of the prefilter is the selection of the + pitch period. The pitch search should be optimized for the following + criteria: + + + + + +Valin, et al. Expires November 18, 2012 [Page 151] + +Internet-Draft Interactive Audio Codec May 2012 + + + o continuity: it is important that the pitch period does not change + abruptly between frames; and + + o avoidance of pitch multiples: when the period used is a multiple + of the real period (lower frequency fundamental), the post-filter + loses most of its ability to reduce noise + +5.3.2. 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 multiples 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. + +5.3.3. Energy Envelope Quantization + + Energy quantization (both coarse and fine) can be easily understood + from the decoding process. For all useful bitrates, the coarse + quantizer always chooses the quantized log energy value that + minimizes the error for each band. Only at very low rate does the + encoder allow larger errors to minimize the rate and avoid using more + bits than are available. When the available CPU requirements allow + it, it is best to try encoding the coarse energy both with and + without inter-frame prediction such that the best prediction mode can + be selected. The optimal mode depends on the coding rate, the + available bitrate, and the current rate of packet loss. + + The fine energy quantizer always chooses the quantized log energy + value that minimizes the error for each band because the rate of the + fine quantization depends only on the bit allocation and not on the + values that are coded. + +5.3.4. Bit Allocation + + The encoder must use exactly the same bit allocation process as used + by the decoder and described in Section 4.3.3. The three mechanisms + that can be used by the encoder to adjust the bitrate on a frame-by- + frame basis are band boost, allocation trim, and band skipping. + +5.3.4.1. Band Boost + + The reference encoder makes a decision to boost a band when the + energy of that band is significantly higher than that of the + + + +Valin, et al. Expires November 18, 2012 [Page 152] + +Internet-Draft Interactive Audio Codec May 2012 + + + neighboring bands. Let E_j be the log-energy of band j, we define + + D_j = 2*E_j - E_j-1 - E_j+1 + + The allocation of band j is boosted once if D_j > t1 and twice if D_j + > t2. For LM>=1, t1=2 and t2=4, while for LM<1, t1=3 and t2=5. + +5.3.4.2. Allocation Trim + + The allocation trim is a value between 0 and 10 (inclusively) that + controls the allocation balance between the low and high frequencies. + The encoder starts with a safe "default" of 5 and deviates from that + default in two different ways. First the trim can deviate by +/- 2 + depending on the spectral tilt of the input signal. For signals with + more low frequencies, the trim is increased by up to 2, while for + signals with more high frequencies, the trim is decreased by up to 2. + For stereo inputs, the trim value can be decreased by up to 4 when + the inter-channel correlation at low frequency (first 8 bands) is + high. + +5.3.4.3. Band Skipping + + The encoder uses band skipping to ensure that the shape of the bands + is only coded if there is at least 1/2 bit per sample available for + the PVQ. If not, then no bit is allocated and folding is used + instead. To ensure continuity in the allocation, some amount of + hysteresis is added to the process, such that a band that received + PVQ bits in the previous frame only needs 7/16 bit/sample to be coded + for the current frame, while a band that did not receive PVQ bits in + the previous frames needs at least 9/16 bit/sample to be coded. + +5.3.5. Stereo Decisions + + Because CELT applies mid-side stereo coupling in the normalized + domain, it does not suffer from important stereo image problems even + when the two channels are completely uncorrelated. For this reason + it is always safe to use stereo coupling on any audio frame. That + being said, there are some frames for which dual (independent) stereo + is still more efficient. This decision is made by comparing the + estimated entropy with and without coupling over the first 13 bands, + taking into account the fact that all bands with more than two MDCT + bins require one extra degree of freedom when coded in mid-side. Let + L1_ms and L1_lr be the L1-norm of the mid-side vector and the L1-norm + of the left-right vector, respectively. The decision to use mid-side + is made if and only if + + L1_ms L1_lr + -------- < ----- + + + +Valin, et al. Expires November 18, 2012 [Page 153] + +Internet-Draft Interactive Audio Codec May 2012 + + + bins + E bins + + where bins is the number of MDCT bins in the first 13 bands and E is + the number of extra degrees of freedom for mid-side coding. For + LM>1, E=13, otherwise E=5. + + The reference encoder decides on the intensity stereo threshold based + on the bitrate alone. After taking into account the frame size by + subtracting 80 bits per frame for coarse energy, the first band using + intensity coding is as follows: + + +----------------+------------+ + | bitrate (kb/s) | start band | + +----------------+------------+ + | <35 | 8 | + | | | + | 35-50 | 12 | + | | | + | 50-68 | 16 | + | | | + | 84-84 | 18 | + | | | + | 84-102 | 19 | + | | | + | 102-130 | 20 | + | | | + | >130 | disabled | + +----------------+------------+ + + Table 66: Thresholds for Intensity Stereo + +5.3.6. Time-Frequency Decision + + The choice of time-frequency resolution used in Section 4.3.4.5 is + based on R-D optimization. The distortion is the L1-norm (sum of + absolute values) of each band after each TF resolution under + consideration. The L1 norm is used because it represents the entropy + for a Laplacian source. The number of bits required to code a change + in TF resolution between two bands is higher than the cost of having + those two bands use the same resolution, which is what requires the + R-D optimization. The optimal decision is computed using the Viterbi + algorithm. See tf_analysis() in celt/celt.c. + +5.3.7. Spreading Values Decision + + The choice of the spreading value in Table 59 has an impact on the + nature of the coding noise introduced by CELT. The larger the f_r + value, the lower the impact of the rotation, and the more tonal the + + + +Valin, et al. Expires November 18, 2012 [Page 154] + +Internet-Draft Interactive Audio Codec May 2012 + + + coding noise. The more tonal the signal, the more tonal the noise + should be, so the CELT encoder determines the optimal value for f_r + by estimating how tonal the signal is. The tonality estimate is + based on discrete pdf (4-bin histogram) of each band. Bands that + have a large number of small values are considered more tonal and a + decision is made by combining all bands with more than 8 samples. + See spreading_decision() in celt/bands.c. + +5.3.8. 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 PVQ is used to + encode the unit vector that results from the normalization in + Section 5.3.2 directly. Given a PVQ codevector y, the unit vector X + is obtained as X = y/||y||, where ||.|| denotes the L2 norm. + +5.3.8.1. 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 + trade-off between quality and complexity. The method used in the + reference implementation computes an initial codeword y1 by + projecting the normalized spectrum X onto the codebook pyramid of K-1 + pulses: + + y0 = truncate_towards_zero( (K-1) * X / sum(abs(X))) + + 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 + X: + + T + J = -X * 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. See alg_quant() in celt/vq.c. + + + + +Valin, et al. Expires November 18, 2012 [Page 155] + +Internet-Draft Interactive Audio Codec May 2012 + + +5.3.8.2. PVQ Encoding + + The vector to encode, X, is converted into an index i such that + 0 <= i < V(N,K) as follows. Let i = 0 and k = 0. Then for + j = (N - 1) down to 0, inclusive, do: + + 1. If k > 0, set i = i + (V(N-j-1,k-1) + V(N-j,k-1))/2. + + 2. Set k = k + abs(X[j]). + + 3. If X[j] < 0, set i = i + (V(N-j-1,k) + V(N-j,k))/2. + + The index i is then encoded using the procedure in Section 5.1.4 with + ft = V(N,K). + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 156] + +Internet-Draft Interactive Audio Codec May 2012 + + +6. Conformance + + It is our intention to allow the greatest possible choice of freedom + in implementing the specification. For this reason, outside of the + 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 in addition to + following the normative keywords in this document, a decoder's output + MUST also be within the thresholds specified by the opus_compare.c + tool (included with the code) when compared to the reference + implementation for each of the test vectors provided (see + Appendix A.4) and for each output sampling rate and channel count + supported. In addition, a compliant decoder implementation MUST have + the same final range decoder state as that of the reference decoder. + It is therefore RECOMMENDED that the decoder implement the same + functional behavior as the reference. A decoder implementation is + not required to support all output sampling rates or all output + channel counts. + +6.1. Testing + + Using the reference code provided in Appendix A, a test vector can be + decoded with + + opus_demo -d testvectorX.bit testX.out + + where is the sampling rate and can be 8000, 12000, 16000, + 24000, or 48000, and is 1 for mono or 2 for stereo. + + If the range decoder state is incorrect for one of the frames, the + decoder will exit with "Error: Range coder state mismatch between + encoder and decoder". If the decoder succeeds, then the output can + be compared with the "reference" output with + + opus_compare -s -r testvectorX.dec testX.out + + for stereo or + + opus_compare -r testvectorX.dec testX.out + + for mono. + + In addition to indicating whether the test vector comparison passes, + the opus_compare tool outputs an "Opus quality metric" that indicates + + + +Valin, et al. Expires November 18, 2012 [Page 157] + +Internet-Draft Interactive Audio Codec May 2012 + + + how well the tested decoder matches the reference implementation. A + quality of 0 corresponds to the passing threshold, while a quality of + 100 is the highest possible value and means that the output of the + tested decoder is identical to the reference implementation. The + passing threshold (quality 0) was calibrated in such a way that it + corresponds to additive white noise with a 48 dB SNR (similar to what + can be obtained on a cassette deck). It is still possible for an + implementation to sound very good with such a low quality measure + (e.g. if the deviation is due to inaudible phase distortion), but + unless this is verified by listening tests, it is RECOMMENDED that + implementations achive a quality above 90 for 48 kHz decoding. For + other sampling rates, it is normal for the quality metric to be lower + (typically as low as 50 even for a good implementation) because of + harmless mismatch with the delay and phase of the internal sampling + rate conversion. + + On POSIX environments, the run_vectors.sh script can be used to + verify all test vectors. This can be done with + + run_vectors.sh + + where is the directory where the opus_demo and + opus_compare executables are built and is the directory + containing the test vectors. + +6.2. Opus Custom + + Opus Custom is an OPTIONAL part of the specification that is defined + to handle special sample 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, or 20 ms is needed (for either complexity + or latency reasons). Because Opus Custom is optional, streams + encoded using Opus Custom cannot be expected to be decodable by all + Opus implementations. Also, because no in-band mechanism exists for + specifying the sampling rate and frame size of Opus Custom streams, + out-of-band signaling is required. In Opus Custom operation, only + the CELT layer is available, using the opus_custom_* function calls + in opus_custom.h. + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 158] + +Internet-Draft Interactive Audio Codec May 2012 + + +7. Security Considerations + + Implementations of the Opus codec need to take appropriate security + considerations into account, as outlined in [DOS]. 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 streams 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 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 that an implementation avoids them. For + architectures on which denormals are problematic, adding very small + floating-point offsets to the affected signals to prevent significant + numbers of denormalized operations is RECOMMENDED. Alternatively, it + is often possible to configure the hardware to treat denormals as + zero (DAZ). No such issue exists for the fixed-point reference + implementation. + + The reference implementation was validated in the following + conditions: + + 1. Sending the decoder valid packets generated by the reference + encoder and verifying that the decoder's final range coder state + matches that of the encoder. + + 2. Sending the decoder packets generated by the reference encoder + and then subjected to random corruption. + + 3. Sending the decoder random packets. + + 4. Sending the decoder packets generated by a version of the + reference encoder modified to make random coding decisions + (internal fuzzing), including mode switching, and verifying that + the range coder final states match. + + In all of the conditions above, both the encoder and the decoder were + run inside the Valgrind [Valgrind] memory debugger, which tracks + reads and writes to invalid memory regions as well as the use of + + + +Valin, et al. Expires November 18, 2012 [Page 159] + +Internet-Draft Interactive Audio Codec May 2012 + + + uninitialized memory. There were no errors reported on any of the + tested conditions. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 160] + +Internet-Draft Interactive Audio Codec May 2012 + + +8. IANA Considerations + + This document has no actions for IANA. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 161] + +Internet-Draft Interactive Audio Codec May 2012 + + +9. Acknowledgements + + 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, + and Christian Hoene for their help with subjective testing of the + Opus codec. Thanks to Ralph Giles, John Ridges, Ben Schwartz, Keith + Yan, Christian Hoene, Kat Walsh, and many others on the Opus and CELT + mailing lists for their bug reports and feedback. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 162] + +Internet-Draft Interactive Audio Codec May 2012 + + +10. Copying Conditions + + The authors agree to grant third parties the irrevocable right to + copy, use and distribute the work (excluding Code Components + available under the simplified BSD license), with or without + modification, in any medium, without royalty, provided that, unless + separate permission is granted, redistributed modified works do not + contain misleading author, version, name of work, or endorsement + information. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 163] + +Internet-Draft Interactive Audio Codec May 2012 + + +11. References + +11.1. Normative References + + [rfc2119] Bradner, S., "Key words for use in RFCs to Indicate + Requirement Levels", RFC 2119. + +11.2. Informative References + + [requirements] + Valin, J., Vos, K., and IETF, "Requirements for an + Internet Audio Codec", RFC 6366, August 2011. + + [RFC3550] Schulzrinne, H., Casner, S., Frederick, R., and V. + Jacobson, "RTP: A Transport Protocol for Real-Time + Applications", STD 64, RFC 3550, July 2003. + + [RFC3533] Pfeiffer, S., "The Ogg Encapsulation Format Version 0", + RFC 3533, May 2003. + + [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. + + [CELT] Valin, J-M., Terriberry, T.B., Maxwell, G., and C. + Montgomery, "Constrained-Energy Lapped Transform (CELT) + Codec", draft-valin-celt-codec-02 (work in progress), + July 2010, . + + [SRTP-VBR] + Perkins, C. and J. Valin, "Guidelines for the use of + Variable Bit Rate Audio with Secure RTP", RFC 6562, + July 2011. + + [DOS] Handley, M., Rescorla, E., and IAB, "Internet Denial-of- + Service Considerations", RFC 4732, December 2006. + + [Martin79] + Martin, G., "Range encoding: An algorithm for removing + redundancy from a digitised message", Proc. Institution of + Electronic and Radio Engineers International Conference on + + + +Valin, et al. Expires November 18, 2012 [Page 164] + +Internet-Draft Interactive Audio Codec May 2012 + + + Video and Data Recording , 1979. + + [coding-thesis] + Pasco, R., "Source coding algorithms for fast data + compression", Ph.D. thesis Dept. of Electrical + Engineering, Stanford University, May 1976. + + [PVQ] Fischer, T., "A Pyramid Vector Quantizer", IEEE Trans. on + Information Theory, Vol. 32 pp. 568-583, July 1986. + + [Kabal86] Kabal, P. and R. Ramachandran, "The Computation of Line + Spectral Frequencies Using Chebyshev Polynomials", IEEE + Trans. Acoustics, Speech, Signal Processing, vol. 34, no. + 6 pp. 1419-1426, December 1986. + + [Valgrind] + "Valgrind website", . + + [Google-NetEQ] + "Google NetEQ code", . + + [Google-WebRTC] + "Google WebRTC code", . + + [Opus-git] + "Opus Git Repository", . + + [Opus-website] + "Opus website", . + + [Vorbis-website] + "Vorbis website", . + + [Matroska-website] + "Matroska website", . + + [Vectors-website] + "Opus Testvectors (webside)", + . + + [Vectors-proc] + "Opus Testvectors (proceedings)", . + + [line-spectral-pairs] + Wikipedia, "Line Spectral Pairs", + + + +Valin, et al. Expires November 18, 2012 [Page 165] + +Internet-Draft Interactive Audio Codec May 2012 + + + . + + [range-coding] + Wikipedia, "Range Coding", + . + + [Hadamard] + Wikipedia, "Hadamard Transform", + . + + [Viterbi] Wikipedia, "Viterbi Algorithm", + . + + [Whitening] + Wikipedia, "White Noise", + . + + [LPC] Wikipedia, "Linear Prediction", + . + + [MDCT] Wikipedia, "Modified Discrete Cosine Transform", . + + [FFT] Wikipedia, "Fast Fourier Transform", + . + + [z-transform] + Wikipedia, "Z-transform", + . + + [Burg] Burg, JP., "Maximum Entropy Spectral Analysis". + + [Schur] Le Roux, J. and C. Gueguen, "A fixed point computation of + partial correlation coefficients", ICASSP-1977, Proc. IEEE + Int. Conf. Acoust., Speech, Signal Processing, pp. 257- + 259, October 1977. + + [Princen86] + Princen, J. and A. Bradley, "Analysis/synthesis filter + bank design based on time domain aliasing cancellation", + IEEE Trans. Acoust. Speech Sig. Proc. ASSP-34 (5), 1153- + 1161 1986. + + [Valin2010] + Valin, JM., Terriberry, T., Montgomery, C., and G. + Maxwell, "A High-Quality Speech and Audio Codec With Less + Than 10 ms delay", IEEE Trans. on Audio, Speech and + Language Processing, Vol. 18, No. 1, pp. 58-67 2010. + + + +Valin, et al. Expires November 18, 2012 [Page 166] + +Internet-Draft Interactive Audio Codec May 2012 + + + [Zwicker61] + Zwicker, E., "Subdivision of the audible frequency range + into critical bands", The Journal of the Acoustical + Society of America, Vol. 33, No 2 p. 248, February 1961. + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 167] + +Internet-Draft Interactive Audio Codec May 2012 + + +Appendix A. Reference Implementation + + This appendix contains the complete source code for the reference + implementation of the Opus codec written in C. By default, this + implementation relies on floating-point arithmetic, but it can be + compiled to use only fixed-point arithmetic by defining the + FIXED_POINT macro. Information on building and using the reference + implementation is available in the README file. + + 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 [FFT] used is a slightly modified version of the KISS-FFT + library, but it is easy to substitute any other FFT library. + + While the reference implementation does not rely on any _undefined + behavior_ as defined by C89 or C99, it relies on common + _implementation-defined behavior_ for two's complement architectures: + + o Right shifts of negative values are consistent with two's + complement arithmetic, so that a>>b is equivalent to + floor(a/(2**b)), + + o For conversion to a signed integer of N bits, the value is reduced + modulo 2**N to be within range of the type, + + o The result of integer division of a negative value is truncated + towards zero, and + + o The compiler provides a 64-bit integer type (a C99 requirement + which is supported by most C89 compilers). + + In its current form, the reference implementation also requires the + following architectural characteristics to obtain acceptable + performance: + + o Two's complement arithmetic, + + o At least a 16 bit by 16 bit integer multiplier (32-bit result), + and + + o At least a 32-bit adder/accumulator. + +A.1. Extracting the source + + The complete source code can be extracted from this draft, by running + the following command line: + + + + +Valin, et al. Expires November 18, 2012 [Page 168] + +Internet-Draft Interactive Audio Codec May 2012 + + + o cat draft-ietf-codec-opus.txt | grep '^\ \ \ ###' | sed -e + 's/...###//' | base64 -d > opus_source.tar.gz + + o tar xzvf opus_source.tar.gz + + o cd opus_source + + o make + + On systems where the provided Makefile does not work, the following + command line may be used to compile the source code: + + o cc -O2 -g -o opus_demo src/opus_demo.c `cat *.mk | grep -v fixed | + sed -e 's/.*=//' -e 's/\\\\//'` -DOPUS_BUILD -Iinclude -Icelt + -Isilk -Isilk/float -DUSE_ALLOCA -Drestrict= -lm + + On systems where the base64 utility is not present, the following + commands can be used instead: + + o cat draft-ietf-codec-opus.txt | grep '^\ \ \ ###' | sed -e + 's/...###//' > opus.b64 + + o openssl base64 -d -in opus.b64 > opus_source.tar.gz + +A.2. Up-to-date Implementation + + As of the time of publication of this memo, an up-to-date + implementation conforming to this standard is available in a Git + repository [Opus-git]. Releases and other resources are available at + [Opus-website]. However, although that implementation is expected to + remain conformant with the standard, it is the code in this document + that shall remain normative. + +A.3. 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Expires November 18, 2012 [Page 186] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###o+v04XzB0EZ9M7bRzw+2EXEbHNJHthGpNkS6Dgwch3O8vQ7Icvg2kOF+OUYXB4qz + ###wunKuG+9CGUagIQO4wYwQ+8YCln5MPtGmjsQkCL/ytITYgpZ1Ywodt1ryZL8YIKi + ###QbIYe+W0rntmcwso93VGCGF9A0SnTfyROBTSin+tOp9xBSAc82h06gFMA3poVlJh + ###5nIwSnJQUmkfsq4P5AY4LuQMfXJZfy67l3l0+1pL5LIwUj194U0WhWGbDMaW5gff + ###TDqj6XDyoYpo+VulBP993shUWxmXDnSvYKj08Y7BbJevUXKm7lIrLhOS8clmc80W + ###UdBsPRwKl2e1y+VJG1Gk6N29Azxqf8dIk79b0s8cEm0LhiYz4Z1Q4qgf3KpMGKVv + ###D7wT65SxqQbFwHTwN2zTk4RMiNPD6puOoXT16sBaVfMpqVWsQ+XSuq2Y1Uql8UA7 + ###7oLtuPWHWvLslj7boYApGqo0++2NphGRAXFBmFtzbr77lf1YxvmUkBpuGRJNOaH4 + ###4i2Hl/FVr5DTs1Jwyq+YhkrCCtYrqFGj9+gJcgL6oZv1sCIebqSSJUCbBa/eMD2r + ###mbokXD9TYrLc74qupZJT8eyMGYvprjSd3UKuVjZVkOb9lEFQcbrG16Jo0lCeizab + ###Zi0zVGuSGDebXnpEAIealVYju2YlXbNs1NRzdrYcz+wm1ZSX6k1VdNfmVXSzPU9T + ###5SomO8zmFLlX/+g69P9/D1+VxARK9vGVbEeaa5ingcAPPBGg7YfJPcgHaDkYk7W5 + ###zn4CWCBakkz2WQDHd4yxsXk8odJD8gqjyUlRHsoKBwoaVWQWG2jru3sSy/By32qi + ###WqD1xtz11bJ1mANbSAbHjRr+9qB9T4czpPQYaxULxWVFnYZw+80b9NQ5/HF/w4gB + ###qBuAffZACyenZ8fbR9m1pdp8du0jdLbZyAg/mNWROG11wM13//f/CtcRozjpEPPf + ###Vu7YDC6FZ/z+H5buR5zrmsHQgsHx/vb5u7N9mmfr+Hx/aanXH/nA95zvf6hW+HiG + ###o5lCRrThoWRfKvwMnuzySa7LCvOM6WBMZ3hrEAc5fJQKe2nwEbrt1MWqtmK6Qism + ###HFh4uaI6Dk1B0zZTUuFSBoGPCK+Hk8Ft8rSR05SfKuqj0A2a30T4l2MrSvGunc6T + ###ZjoMJzoqgpVF7Bt8Z00VyPZdOMlZoNNhrrklV8/WgJ9BuTNvpn8x7507Ov4CTujK + ###JJc8OdTauxUUUPEmzcPACPKFpQ/cdM0DPMlCddK2oldChZq23SC7JrdeVP0sYNdk + ###3XmjaZN9dZ3W0zPyUGiRK2VlV35fkcbshezH8zTT3KrExWJzV6+PtWHMFdL2UiRV + ###HQ67sO4YpZ6iGeH0AJRARFlZgqZQQx92sN93vvO7/sCPSDc4irpBdK8ekcujcE4K + ###YoyNFFLKHJ+8kNASJEInzDcRpq9Ad6HRGJlZmFHnWgSUJ+U/qVWHgChYQSQv4sjt + ###0J1yQALR75bS8MCbvV1HWft1gUAJr1J/KBK0QiU4OoaYipQiO4G0jKmWIp7qCRo1 + ###1UrOWslBUUl5LOlkuDzRFkHnA5EZuahuyQHxS36r0jfHgfbgjXy6Kp5CF1SiUeJ6 + ###dSopSqHmiErBKLCG63Fp1+Wabk3UWucW3Cr341aopSUke6YKshvgBUXUD+AsbF2L + ###FcoKI11JJwiWxS3J85eNGfnpVMIYai4VoFzIRSeVgpHKlIOFUzKZdBY2k7MQmVtF + ###LAziitTgTCWJWqqCQMqmtWgiKWzZyzAJS+RSTURbmX/tBjP4wP3A1uOshKwME5M1 + ###7AIeiAGcHsVivYdzev28NEcwFGodbEPoehJhyjPuu/4t0ekPQprFlstYIlqyBPJs + ###fB0kSfYamr19KZIQdlz7fuQ+iA+2KotR4KTibG1lJIRKz3XmRDPtjWDMLmGTZ4vL + ###7mNuj3gQBa/wS8KcBtt9QkM5bMnNJxpL9MMARy/TxOgzmpFly1bZzwkfUuk38ZG9 + ###RwWz2OY/o14P+PeSTgfa6vhjM2h8Vop4Q7eI5h+8YdY+rMGA5KKQVQ8cUKtrDTyv + ###1mtrcGR5rleD001Y1Hh1r4HfVut1KFmtVGprOr38x2HJ+djWpIDihBdORCpLHVIe + ###ecMTQ4Y/8crljSWd+Wg6HgM30A8H6O88lHKnT6ngfDFFh64v2QKDw3w3m2L8wJjo + ###zFp+/9a/j9lORiRvI5NGutseYcI5vDJFjj6dbMOIoSFvrzY4cMZtyA7Vt6TJloYk + ###eM037KhMdWifcxVMMDxHN+jK6Fkf2zL8XLusFq+cq21uCnvFEnDUxROvwKucXznx + ###hKJG11yThRHehhrnY3sTXXz5HaXgVDvt41ALAja1ojcmSnxsg6i4erm1lXNrZWhz + ###a0taUm6YVXIfh0WM74c+xdnBsqDYZpMEZtMZ+ePQMjjuTYcd6bQOCz0GZA0lS0vX + ###25TveNjlxCT0hZ1GZLJjyTEORsMR3+8xgmDSwGWMczaUFwtUAh+XcIkwIRYjkXRb + ###YsSlZCkUWgWtnQeh5ZSCJlPQOq6yCpSC5a/9fq/MkQ2cQwregs23Me1Wv0/BR4Va + ###BLjreCS0jh2KkIoqRyiJM+PhwBDWKBBdbOYWV+bRlOKFrPhzfPuA2CutUyz5VF5A + ###zL7OttONGyQmkSWZxVJhPsNfJ70Wugqgwslosj+6xZFRXuXO5M4pBB3LvJotpwtR + ###MPBD5O5buBm1cXe6pdZoOplvetMHMaVvdSLsswtoDZXKuZLZSdwBEaRzzQ1iFklB + ###QbnfpGW637kONNFTn/DeiuajL3tECg9aVy3OD8Iu2gSEhlEAn7zNE/2ltWN/0+V2 + ###Ks0d9WUSDoIWZnGzmgJ047xMxjOQzpRWwbY2SBgoEFBHw6sdMjRM5Duiu6V0divu + ###lJxxmM7odA7Wm28YXa3LVN0XFIDJoX6U+IzWDioYea4IAeQiWzv8krdKU272pvOz + ###8w28fnd0pEwezjHsDyY584X7AhL2GN0YAyNf8Yk0+/0tS91h5stR+WSy9RTskXA1 + ###bCYtVhPYvtVUJHq2IztUY0g9YIlIKdGazt2HyuVmJWXoxxFBqdccBhLE0iU7auos + + + +Valin, et al. Expires November 18, 2012 [Page 187] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###12vdtghIqBpJVbe9XuzJom5dTTeRoa/czHrzOWkfSKhjg+GO0xjTAP/llEkReb67 + ###fYQRcV475lczWy4iSaZaxi0KtsnUahn0x+jceMpjkKlpKpclnelYBgcx8tmR9k6z + ###P0S0nGbTqaRw78YchaKyVh5xtb2RmZQlDEMDVBmpQpyNGq++gKTjToiCj1NAi3vc + ###lqP+VBrRpOeOA83pvlC1l4MN+K2bp5Hja9X7ZoWMU3YqW1q/N8dJcc7lpwFlQZaF + ###NRc/tDMly5E2k3U0Y72UMiFWUzLNiM0U5CbfbBN/wOmWIVezfsltXDat3VMpufSf + ###V6rSf4m/BrInSEXWnmdBDW1ft7ZuSg7ZJyeqibln1VMHcnZtypjczJ4WvgNO8ODy + ###95mvt7Zql5ubXtIpbQfkQw1kyeW3djY3zcdGEnfGTZl1E8+0BHJaecfnIWEG6j0I + ###19aOSvz2SJimahI8f2/SXyBuxpsdB2Zv2Vbj+aYFaSGl6uPcusxWU0wH81XsQMYp + ###Ke/kRtGVP0TrbuEqAEcgm9sgpFlLGwKyoz3OqGdQCH5lhf2lHb44lLO1mgz1rS2F + ###DQDGyuam8VUzBQstTHY35kI9srPPVirSw56yZ3eX6yBIRBw3i+KkiOS6wiu5lBAq + ###hEQhxT9iHlm3Tx+X6ZQs6u8havY/5I6OQbjKclhKHCRHx8j3lF26b3G2uP0P/Lty + ###eVl06SbmZMuzzpkTG/F+JjsZZaUgeSv1HjopG18JDWxvKUFHckQz3PzvOd4AmlfY + ###wbc7LDAmjkXqLnUMfhxaCQJYxK+YzwYsO8T8hzI5mK8/UlAz84kSt82HLGZbT6Lw + ###qoXj30hLLpMAHy8ZjiZk3SZCqRk0C07cq5BT49KeI5CCUOcPggkH0Jz4emOpkTFm + ###9EdXJ3gzdHRc0PK8AiWPGOGpqqGs75SlfuXbb1G7ApzRDxff7V9st04PDs73L1oX + ###P52+/W77fB9YJOuFLdYbmicQCUEclNomQ9OUwS5pjAy3mkpUNDDEUEBkkovfLGsd + ###hg9mv8bIIxhELS8vlSI0+wWBeXIbBAz2nI5llAiSQZa+sAdByFl2fkKBnTxWSJmk + ###FqMkd3AUlMn+UqkVdEgr03TYuM+6UemVAf4wlHtWNGEEArayFloF9c8TxfAmaxRN + ###rkdXmEx72bY4kgnw7HyRQDN/LimR8iTlCY6oyew6fmr1Ir+TkzlbpX5o+E3zMcTb + ###SMVHnwofh8U1dx3tKtxaItX6/nASjcboMM5ebLxYcGT1g2V0FUKI+QgZCoA77vak + ###Sbet+8YDiTZLiVV9YyomZ41r4DuTKIR2p32fRTppGo5mf8sp2y1D5bjlzY0cNsaj + ###s7qReo6Cg5Fq036HdT4OV7z0K/KdGVcKubsKkD0g8XeVVKCudwSURN4cGMd0TCw7 + ###Ez2EuIz1OyQ4uo7fm5gH8yOlRpUpAgW6u83mXeVfMNC717m7slu+q+SLPObCuKLf + ###5u7gCZaw39txkuZIkwSSOCWi9uKmSg+Bo0m1p7INbKpO8xmecHfNXrwyzhCBkz6l + ###sjg2VsR8C7rZLPnZiMX//LAyt9jdbK87bUSEzBeKWYIApx0f3xn7a0Hs0HoC1JuR + ###iM+DKjmk4bXHlQVPNQcJL9lOsn4mbjBiNN2SY0X9ksmQckC18HhDGBqfN56G+dRZ + ###f2MpjYZqk6POWvQDR6h4VoQ99xrPMPxQziQHMjnJ7FYKOd0aklDndQozYcplmrLV + ###Ecycnnj6CTacnoa1sc3sLwtvU1TLa/KagUYKiM30ZqMXgzRYrCQwPLRJxuhVzg65 + ###zmrBJcTyC/nQGscW+oNUvdxawYzim+8NqEHKIGTHcMhEiKKTXUSvdnJlH3a5zdpH + ###8+fiCSRws8gfIkb2XHOEUjBjnCxVnzvlh1BcpeB5HKKmwPEgqZ2Pvdn6QgUrI7iw + ###WCC6G1zRQoVFNJA7MLJdz9LIynvG9AGUci0eUNb6n4WjLUWGOVmAklqumdzASX5W + ###lEsMhL7/GqR76SiNfJdyXxv49wXnOugDAxXeBd3yeIS70+dwzxMH0/841+HVtUMR + ###sDOW+SiY/BPDDDB/i7mBoHQQkYDQR6PDe00aTDvX9NGUSZ2Th8Anvd+2HGR50hQe + ###Ci1A3n/ZmOeJn+mIr/2dyj/b+sXU1n30Sif02e0tTwp0iHVJdfmW4z35csBS+GPw + ###6TEf5sNPJcdb5BinNdDqft2Elz7EM1bPuveQW7GSFFNYLM8QVNAiItBCdxtVDlKG + ###l5KvlMwd1rCZso3sselkKgE5CzpFDjKHKTxSK0kV3rdNyjS5ky9byegojyWqW5Ca + ###bKSRXw/CipCSHkglYxDJwamByJHkbY2iHE3WYNI9WiHcBW3OGIRVjLNJpgsbMe2l + ###T+6nWEjbOpI80Q1KyQmSObz+OAWpt+sEUTSKEujDZXEH2QKcnKIRWjx3QoBYLaXD + ###rJM7cSiywauDZmZMG4YLlk/4J1NDdjwXLpvDYIqcdquQUc96Ldswgy5ZuQDi5PXk + ###SdNjOIzQVel2FN3EhvDLEqB/E8QaPH73kz+coN+EELd7GNdfwD3h7Ky1DRwIGumH + ###oV9GHRX5aSolCYrWAONE1rcTYdttH5eJm57OxgPXoua1qldyCvcmtSe9HqKi6egk + ###nlU20k5dpJYVo1XKAJpMyo+Lt+c34t5Af82IZyR7zLqjHMirzVhd94t5zTnEMm5G + ###mbwVRSvGVSVaTnVAbvgZhA4zCte9fPEeXvyc4GWomS+/UkbHGwwXfhswIsq4EoJV + ###8vnadSac7Xtp70PlElYXHdrK+M2lb5VLYPL//Otq46Oo7Ja9An7cSAa6mVICInn6 + ###UDj1lFn7iCy9FFSAI5hOHDPgkT4YbVs1Vhp2+gHRR6zfH92ymRrexkCPNlXsoDxl + ###mAFJE6ABcR+4odAOgixrpY5cmPOwKY804zFMeAy7nZKTtM5ByxzLHIebZ8Mbh61s + ###2LQmZU+jYJZPgZQDWLFiHEkf2URR6CCYHzokcKopF+NkVUAwhD8+Qbgs7e2SgfaF + ###jiwK/hmbAVGAkgKv67cxFdQgJK8JZbvFabBEzFMbyoyncNgjQhQId62diDjNNggF + + + +Valin, et al. Expires November 18, 2012 [Page 188] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###QvONhwwXbIy17F43EgF1K5ez3P4ryfBy73kcmYVTuQF+zmpZRuGopEu7s0un2mbH + ###1vc2JPRsONYAWnxn9kRlOJbAjDKyffcyEwBm++6MmZjtu5nB9tLEBZD1FcesfiWQ + ###lcigtR/1aTYM7pAhoV3gNdkc6aFyuKfcZFnynqNCuMvSuTz4OioK2n7fH3aChDL+ + ###DV49yVtKij8HfcmYyBymla4u6S6CjVi1XWs3iIPoU/r0JOUjHJvG7aM4UdG1sIcB + ###/R6WnsW5mM84dc7IOtfOZNSjrG9BOehcjxyM0xYm4tqZfCKcqPRhaytXK9sB5GaI + ###POSuH7HZKcfpQxIT3fpRtyx7i/ujMTFYePPb3cGccY5bcQbxzHEIK92KuJRET9UT + ###bZWbq+PY8jNkRMn8HB5vv8cW2FIYbYLL1Fh+xY7lKNmUdnmQ4EVm8hvJxCqGtc83 + ###KS0I+qSZOK0tbYocimCr6pWR8RJ7w+cYb2kuTSCNCog49mMM8G4eLMvOqURC1EH/ + ###M07YXgy7aEpr+I1l3/XMHj3tNMNWCL7OCz+p9x/Wwb9F1wSe2n3ouW5DO3EY8Kpu + ###CYZxXuTCw6GE1IDO9Fs8KClCkU/RY3wVO0bcLCOjb7AifOhZ+V2SSIo1cF/hWYoN + ###Yayw1F3SfB7j/eNZjAydy4NMR2rtslrhgei1khyJAOO/RKxAYJj1QfYWDjLiWFBY + ###zGBbkhxLYrEF/4+HvHhYTqx/xv2EbmDLqZo6ICaM32SoFXlzF5tG59Bp1bAISKLP + ###AXFJpotEibCBNH0mR0kyoXCO+DWIRsR4DUdp1RnjyC1WaRPTpm0agBNYzsCb3+cg + ###zs8G4sRPRhyLIs1GH+rpERiTgR84x7wcM1u87eQ3N3N4GG65+W8FySnbgWwzRZS/ + ###yOr87RcnsZfjr7KXMxQK6nCft5//uqfB7y/HQVpaWMrwp0ooR9t+HHYA/mWbQRLK + ###cNa4xh5HQMsxOHGubdWfcitBcxIq5pFyQ5f9qKPupHk+wytlyTDWYa86Yfg0RE9/ + ###p82mUTDkaRf91pJmt8nGN1mL9tFMyffbbP6z2Ex4yAgQCN+/x0/2wfkm7hrJAso4 + ###ZhNKy++hS5h2SyzFx3xCpjoIhxQcocs7ze9Mpn6f94QdinLhSy+ixn7/qkWNkFFs + ###yfne2jtBJ8PZxv7HupdUdG3578FzSY1iOpw3Du5mYZn5sGeqYgimvI+0Yaw/vIcD + ###zgZa4v5uEUWK4ZtEkbyTRHRHuuJhWHRMb4gf3AYdqZwvnMIlDyiUMXqE9lD7RuEs + ###OAdvEqZugwQemZd3Q5i2Uch1NPsMMC5fL8QhtYNr/1M4ipZT9JSGincGcvj5nPvu + ###KHXjZFwDZU6PrIHZYW2uUneRK1DhOl5Z0J7LkByb7Hm1kHEGpQDLjpi+4Dh/y06v + ###WcgMnV6YGTtdz1h7weetvMRUd2vLq2TW/5zxjPZS5kLNgaTkDfsURn0cdCbRdPDs + ###4DHTyyQVjl8CQ4xrSqrV2hpqR9pBn0xiA+fVUGjNFGdBknTmvJR6Tznku8uV3opX + ###Rz/0yqyuRSg9Hp4Oe4+PXzvl2bN8n3QoKs4oO3OJzcvn2aVnhLBPU9LsawnbBYF4 + ###ClI9wt9pzEkkEM5sVRWR9ls8EiQTI6eVgyF663TF9U1keD6ahPW3pVlalIQdx8k3 + ###zYTyzgqdzaYQpH4+STpu2OYbaSPAhOHGg7g+w2Tjc/paPuFtlz77bxJn/buhOOWF + ###u2gkPWj4nL8aqShLhgcNXgDN8pzJcJ7R9iRf6B2TMXIYVBnH4jC3LcInoPQA3H7g + ###R/0wMTj0RWpqN2Pts2E9MHzoDEeluck40i5OorekN5SSMjoDEOM2FnXVMi3JHnLx + ###Sw3uAUc/y6lohqsfevvdVSol+FXFX7v46wB+VfFZFZ9V8Vn1oJSqtotFdrHILhbZ + ###xWoH+OwAnx3gs4MDm0pspFm3GSPtDC5nAbGS6QpoUKBsRz3hVU0eEkDwx1O+bWeB + ###URL5JMZnu9E+uPnNbBf2m6GVwDSRvuGkki95XlLcfzgTi+nW+0v6zmtYsuJt28CC + ###RciwFvqsImIIZ+DOQMfeYUEapAmRjHGBOA6J3HZp93RMoWfGdng4o968oAoy4Z2V + ###Vm4UTZjopGNEdEEWakkvjYxoEQWQ/CPdnulRNZpAVRbyjcdCP2IFkrByAFLiix2+ + ###M05FfUjFjbTuzFKK+idE386MN83xsBIPvFlxs4yIVxlvE0oIHWFLx344NsI1CPzV + ###zmxGuHLtJO2qV7voDd+SMROAa/KAZ3KfM7SDY4cBw+/HbE8jEuvh8WIgFYzhmMfg + ###yPhgAhS7BRXC287TnYgbxpVS2hsd3dasXU4/w2i3qUZFzpoWJ90RD/AajF4Uncyh + ###bYjAFuaqKNFqgcyQKY9DvQ3b5peTDBdFVoDIa2FdNuj1gAcNPyl8aGpqNSvbrfHt + ###Z7MtpcfTF9OK2Ny1OoPUw3t6KGOUceKvjFSreGL83PqmmZAmfyZkzapg39lhOfMe + ###/SSZr7Wc0cRMv7kl446YQ7pfg2gz8If3rKs3DH+E1aNQvgODTvvNMpwLca/RmufN + ###vLJCC9y01jmh1WoaRLKM5cqWH2WIviaaHJazPPxMpKB4qvxphe+XqyWzfmgedO3k + ###XTTn9uPP9jiLbkklBS2aHRqX3WkZuG0bCS+lFD+oYzSWrXyC96jqAUH0kmwREtTu + ###998TGxAN97PjTKgNGqpVVxjOITaiIImm4VYTT4Rej7d8BszfNxXNmIvdAnHNwp8N + ###5HsToNk+HlFB9MnHDezAnkQDCWX2aZ3s/4yVcR6HmboN/hmZF9ssvXBOQsm2oSyT + ###sPRMAEcaTeb42P+mmYqXTfE/2D/NjMgwQ+TCnltMAzNe2Pmc1eMwwwg50Lps1mNH + ###wTjwJ0KTgga2I+RFOFZcOGRLUT9hPZAijhLtE4hW0phnwwfw0o43LGdnmhtYruZS + ###sa67KJd1tUtnKz2oVA+BFfqE27f0h4keikVZDS0wU+0XrTkgIYfW7/lPJdk3prYz + ###FjGVAJuqozxnp1nkuoXdYsJO7P6B4rtly/DLCODDRTblzFKO0WiBou1K2OKyjSad + + + +Valin, et al. Expires November 18, 2012 [Page 189] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###Mt7I0e4bab1JWmEfCzBPQjerOb8/GMUTY7R8NZvHZoajYRmvaLWK1z6TbChqMcHY + ###aQbzTHeIzbQDfTqUji2UAW53rtFVnzhxedkFk+qONCtum9YbnSZXV8TKtjCfgmUb + ###obOTUhSSL5advts+OgBZTDwoEr9kik+fs6eeMVUBu4XuHdsr3uNvHdPbnoNp/Ium + ###U0y/fi06RGnk24w7ymQH1IwBN+UmVJH3knwdmXHpiJM3t+N9a/Hb+68ADO+ZoOE9 + ###ERz3JjjSbMQCqPIzg+Z/H5b8fp+NKiYn/lmFUE4lvSXT25ylLMibVTOqIDFOV7o3 + ###KkkOsyjvcSmIfip+yjvi2dh3RbAi4xGsBwWRR7NBmcvYpwOeDOVdZL9XhGaWM9Ir + ###wpaSeNtb2vbSyPqQDor8H3/OPxLc4tE06gQrKIWtaAyOlzvP00cF/jUaNfoL/xJ/ + ###a/XKauM/XHe1Dh+8iuf9R8Wtrnq1/3D+49/pX3Jy/yb/SLoc33Mi3Vwn73iVymoZ + ###fq05u+eHZ6eIrNkF1p334fh6+TS6cg5G02GXriaw+E9ROAGqhpdB/yfwh+VjP+o4 + ###P6KZEO6TlQLhf9ANUbBvc7QiSnzFAY8ZF/k2KRz60T3yAwOgW+QzAawB/h1NiRsa + ###jLphL2R3vxLZrI2DaIC9dzGoCV4OdPnqQWxw2Je4xYEj79IeJwtfrDcIJq+JLJQT + ###QyOTODEmuv0aoJVKFEx8EdTXb4/QeUaCiDU0kxBVhySJ90NU7fWMPqWfiDEg6LHT + ###98NBEC3PGAX0ZoBDjkLE/PoaAzGCT3dHnekAJBhfrtUKBjMlzxWUAqPQ78ca3sq3 + ###xZyAnNaJ8KohmzBMrwgDOsSrgyGIeOejThjgUXi4f3GAS01/LyKYKyZJVdF6sCKv + ###C7ow9vgGhbsaRYApA/+eGWzpONaFx3hLhoMcjCYB591B0E1ioOARnJ1dcZ1GBhmj + ###3uQWsUKgmu5nHIWIgYzg1AriWxyrGV58d3junJ8eXPy0fbbvwOe3Z6c/Hu7t7zk7 + ###P8PLfWf39O3PZ5hiyfnu9Ghv/+zc2T7Zg6cnF2eHO+/gTDjHZv6//2/7HGr/85/0 + ###dvvkZ2f//VsUc53TM5AL3x4dQovQxdn2ycUhhuE+PNk9erd3ePIGuIp3F+iZj80c + ###HR4fXkDJi9MSdZ6u6ZweOMf7Z7vfwdftncOjw4ufqcuDw4sT7O7g9Iw0m87b7bOL + ###w913R9tnztt3Z29Pz/cdnOHe4fnu0fbh8f7eMowB+nX2f9w/uXDOgQk/Skz49KeT + ###fWoN5mBO2NnZh5Fu7xztY3c0273Ds/3dC5yW/rQLYIRBAltz/nZ/93CbrTf33+/D + ###pLbPgLniZs/3f3gH5eC9s7d9vP0G5phLQ8cEDTYDy7T77mz/GMcOIDl/t3N+cXjx + ###7mLfeXN6ukdgP98/+/Fwd/98wzk6PSfAvTsHjmhv+2Ib+xatAOCgBBTfeXd+SCA8 + ###PLnYPzt79/bi8PQkD6v+E0AIRroNtfcI1qcnNGcA1unZz9Aur5xYjZLz03f78OoM + ###wUtQ20ZwnAP0di/MYtAlAPPCmCyFLd5/c3T4Zv9kdx8LnGJDPx2e7+dh8Q7PMVzt + ###IXf+0zb0/I7mjosGY+OPh4SOEqFLtLrO4YGzvffjIY5flAd8OD8U6EPg2/1OQH95 + ###Cb0xhFb/O9THwyQODt+0voOHIhviK9i+vfBq+fqV8lfW70x+BAuoF8AT9v1OYD3c + ###BHp0vXy9ZRQbAXszHY9H0cSuDofStf0E647GiV5A+OzctEi/ar+gsBXwJMu/Gw7V + ###44CCq5PDE1DSwAfxmFhCYbAXUGDGH9LZg8wrswBbiT94dTODkFupltwKcObrIGOt + ###1eHHSBy0WnJW4TGmSlhdg5+6flWFr654XCs5jXX9StaAx6sNKiZfNeCx/YN5g/gG + ###5jGzxGciQRRajgBMSePB2ckSEDDuXjMB0FiuVVfrlUoPhrPs1ZHbgo/15VX9sep6 + ###dfERE4DiR1G5trwm39WWqQJ/pBb545r+2FhbtSvXG6qyGoRdw1Mf5SB05czujBpq + ###Brp1Ubmq3y3+kZeKNhSsFQid3ZBTHXRGIDOGcNgOJ/Frp7K8DpLe8hr+atTxdx3X + ###JAOvZy0TNt3CRj/UaKG89VoNk3U0XExKhRk8KFNWda0GI5rVSBt4KrORasWlxB+e + ###t4ZZq7AVWPB6/cE2QKaO0Amutu7WJa4+auQcQ2FZTEB/w3mobxzQh789dla6SZyc + ###bhJ7UN9wqgu2b85YVNkwsrW9lZEmY6mwP2LaWaaM82b4PzTz7wv7LqnF74x8ZJ94 + ###m2OkngvyPw9jzlTihxFFDdSdUOoMJAWcQTsGOlAy0W9yPyYWLEdGIys0+jwHVyTi + ###MZwO2sgJU09OL4xgyvwMO6KWqVdh4Z4IX1gpKb42DpDZFeVEUkrgDZF0lyjIJlGn + ###NRwbp5lcTtIi24QhaGFfLQISrOcH7/JDzVOkaaXgehVpsUVTj4VSVpvmE6+rtAWm + ###vnqVkBwzv+EedD3K2obmh96aekafauqTl3xmNKeL4TFBVF98WrefVcQzF02SnZqL + ###nzCzXK1iNOdSMjnc024Vq3oN61MNK7iYg66BCedw07urlLQOa+ChBC1IRVDJBEbk + ###ZwLDozRAOFKiHFUcKSb8cat19Ql7r2O+uyqOjSw1q5jirl7nt0Zz8hGAheaHFfDA + ###c9ZxkHjsOWuURa8uP62tqhdiIYzm1nGSmIaIjmGnjtCr0BBxul5FgsqjjHzY0jr+ + ###qlUl0OsVy0qnxNjj1Z6OPWuq7TUatGtPSU+T5uWqhcdq61V+a85QPIJ5rcvZENSq + ###CGZcaQehbnyiyREKMDKYyOjWCBcQTA1P4kejrvADx0kZDAnWlKuQRkf5FQl7nPVH + ###YU9VtkqYQujcwGcVT2wqZ522DW2FdWulGTaWZw8DyVUAXpcQXavIrcRtVuVWpH4Y + ###LeiZtZUqNX4koFenXYzFajWJ6tW6ROaqK7GHXhAwavUs7KmtPR17Ggoh1qtycBUi + ###ApQvclURBkLtuiQWOCSX0kpWreXmTJT4EvexSSxwkasKGWqU+RI7qxMy4PwRaugd + + + +Valin, et al. Expires November 18, 2012 [Page 190] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###YTRXX2OEcigDGOWxFDQFqxJGE6bQShD2ENJj3kvRXOVR2OMq7FmXcyas4F1E+6mu + ###NprCDUIB3nJVE3t4x3mK6NYl9hHBJyjjBBnKGl8JLWjL1esp2BKxoxOi7krY0h5F + ###AuQg4gjYrsvOiG4y9nhZ2LPeeDr21Jg9k+SUDi0ihzXKRuoqArIqkZzQvepJYlm1 + ###lhtRg+dAp2FVkXiiM1V8S0uEzCFv9bqn8Ai79SyA1RUK0grx6lYZyQB7ahKj+JMC + ###Ij2jztz6o7DHk9hDFIePGsIUz8YZTzwTJMJTp5F1cjFE6ahxBb1mTCHscdV5564p + ###UqKxRzwzYbuqDkja3ojgdEBVabOsymUhGs7YI9dAYI99cplJZLMYpniARqbMObbC + ###Trf3oXrZ/M0ruaWKUVOys1XP6Y/iuIWKQ5DXgR/LpfhdcUllpdUqjPrdffE4w1ZV + ###ZOka2gmvyYazZJpn8giwc3UhnUyzNMd0zsYDY3RdlaWHQ8Qoc7BOAQZ1CTORo1fP + ###8iUr4qEY0vH2LpkE5/B7yemWEqYGWamehfHv8eFJ1ct5wK7ASOATteAV9nZa598d + ###HlyUa/n8RiIDJOtdmPdXKwgEIvc4A+FHrl/anJCdQUtJk0S7g4SlsebS7X4o9F9J + ###xPmCr8OOaWC8axv4klhi1R/4dy2SIOyspB1l1Nr2u8MgjlNpzmDMIGJ8+sCyQoWQ + ###30YSlBCTz9oU/1Z6y+Cki1U0tWOISKRLhdwcsqEyjr2q89mykGUnswXp3rC8aHPA + ###TC1QZiVrNAuRVHt0fLlhN6hFavlO+RDtD2WmS5+jwkrZMpVsZwEb1Y62/UwnQsOr + ###7hbm2ExYcX2E9foYpqIZ8Rp93MjcwHfZpXulhCObUQUROvsN4U+rjRdmidxgBl2w + ###TXl1M9Aq0YH3QATKylVtfblXkjs5nyQniYT0M4NRIsyJUFn+DHf50ioGRn3LZEN5 + ###JeRwfUvYE3S4hiUIvzuXtn3cGU5TGPsNMbocZ08OrkCSlzqEKCCvZiAtQPKB5Hxj + ###WQl9DCmrS5EnC0NYruvJFlcxlnTO+GpFJ1WAhiZgRqg4h5ED9KAZDT1vzQJf0jQC + ###aDYUz+l1z8+Gb0kTCKSn/2kbYiF478oIOKJ35a8KMaiT7/VHowgBVuzNBkwSmRLg + ###mIdNsOpqwhsp/2+YzFuYIRo+GvlL6ZKNDUC7o1tMUzOCkybs3MCEcsHy1TKnVcUO + ###7OBreIlL1hdGbNBhPuXuA7MXYQHu4IMx1ZnOP1CjKABmntJG1RLsAkeBJO3/DC0Y + ###EQjshahk++wACUJjoYQ5KWd54riEqYTBRgRM4cTOIC0xRPw4ng4S8cXi0SBAk9Mr + ###YO17iWAsttU5nhqW1bUkn448btjuu1rYLUDZrm2jTefLN0ysKQ+Uqr3pVCtzg7KZ + ###Rb1aNgzZ7BvpdgbwzQbcxqwGtt/nyqkWkpGx9TzRwtutz0/WEtpjGYeUbJrGGpZS + ###LtsAZ3FfpRIk4Dn9LZxHGT6+hpZxHF5isGH7UdGFh40ZcxFep8n5ePN2gAEjmgEe + ###k6moNYLTQDaeR+8VPob/U4bCmxXYISlePxm3+8Ehug8NkYPapfAgkwUq8xxmDyDd + ###gWW5TLxiiuhBKXEW9vhkhAMTqAX0lUUgJD8IBMZvx1CqUrYH/1ElC+CzJXH8QmGz + ###3aWE5/m8U3kNcy2IIwY+ccMfS6sP8ADcsHVGouCAh4JjnLPE+uTTRH/2aaGHi+Ev + ###HeuolsNsZg4YgKxniIxnSTT0ESaZz0qoCqRg17C1EzKQWIykF6Ql4Swo3Eh/pv2n + ###CzqWz6CQcZZS3GKWxJIlqwzb25/8sI+Otzv3E9tvEg5UoDoJaQYdFYGW+PdB95Df + ###kFvV7aiFcRGFyIyyON6VmOKOEgyy5CLLl1AXMLgIHkd+ZkGar1lIzBz3Ny0C/p4E + ###egTThJeaIYa5zUrS95IaBkLhx0n5bBjcGnqHjSzvQXnLZgCUctJ+I8FGCRVMqG55 + ###8rxkxysskFwq4B2MEoVd5WgpBppIJ5ITRLNgdVTQa7WS2y3UXemDbE+LfDVsBYvC + ###Uo2ZAtkFfjvGLi7Rvlqawz4YkupWQlBVUGoqSFY2EpIhsjVX/VHb7zu9vn8VCycJ + ###jPlNusnUVaVoO8eXhPH9oD3qx8J0DSYCrPKAmMQ5Ufgl8iLdIzWJjgHSsHnhBHVO + ###rqSm1eWqxf+nu6CWnWXXq/cKqWasqP0JxMdIn/CI4cb+pom9he6q1pLp7WV6qRob + ###7cEap2/fnbfQjivdl4E2ViN5Q3Eh1x32SloLIfeqsp3P0DgNNE5SeLYkysrB2GRU + ###87kl++L26Pjyg3tp0RpsGSjrLof4ckuGqieZQzs9hYTySWzdaW/D0tDQSvI7TcLS + ###rraG6iVB4oaMBm3Ekcz3omPzvUENVSoASXatYZcUxZkYIT30gFIOqkPDQzUxMwtH + ###kQYZA+d2InRz4Ae5bxMYrk50cz4zqhmd5o0pM/i5DkZUgy+9IEpXATYjC6i8QTQ8 + ###StZQymaVRIyD/IbpszsWfrok8zIU4XuZqZIWxvTuMrtU07B7B2bI7F+vAUIcZ5w8 + ###J+1t5n3JNnvUBqMxy01mb6+Kvb3MbPPGQZpTlGFTjx6PW00xmvoFVjCPyRSy5ovG + ###kbplYHY+y0HUgGbGljUWWC0rCehZy5u1wriqs/ArvcIZ7Zh85Fzyn11dLsrMMyBv + ###q01p/ydCi9h64S8Z2qPHpamxJsa4aCZHhA7NaZbOkPuSpbf39rQsVfUo7oodhcVS + ###bJdsPXe+ZLWX0CPaIxE4n3YBMqQSDN/3SJlknpxhSxMUEIV6oM6yxIvUDYfNp2Hl + ###6ElaeyPICe5NDsihx5Jwcrde4N2HqU1Co/9wOFXbcu6FwEdvhqZe+ETPE4oxI40f + ###C4916RMQSU2tpXxFApvLVh0UFV9p6rAtDXbZmm9ahczNa93urJ6gg3wBwZshopPG + ###0gMSiO/LiWhg1AG/2EhW2axklDX1m1b6HMSkj17JSc1oDpxVGARWwbKUn1SJeIZK + ###ZAZIS3anpRmAT4FXJzb/6DEM0V0659YS64LPl3srHGMZ6DUUfZQqpNh0Uq74M9RN + + + +Valin, et al. 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Expires November 18, 2012 [Page 201] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###O5u6ZNjFmuoR7GLmirhsOOoM14tQnfrErc4rh1gr7Sc2jPAxJPoa8GwcX/gFDYz2 + ###EjXG4KM1JjD3eFGdgGQsHEmPCQwuIA8C5txiVM10r7QoBIeANxfiEyElrUKkuBmv + ###bS9jsAPqZLqrkLuKUAbGrqheoOCJaMgrFSoQMYVrkWwesFSrphGwtAng423eI3yj + ###nURrEAp4mFC2CCECvRdRWgz8QHAhYeJJyEsoSxImLSMuGdPRFqMcQZOGSojDpJVp + ###BW6CAIkIoW2stBGapSBli+TbmKkSAyDxFZbiRokYH/yACAPhUMRvU4ZBi+BLU3sI + ###wxsOrpHhAYRFTyL56/4fDOnSDyYZ8qOFKpbDP2j9cEgk66YP6oF/2DIA/yB00z8I + ###lfhHphANCUlUGWCrdtDVkasNFVo/Mv0D9kqLtj3J3Nk9IszykeMP0KQIl9QPs0Mc + ###GGKKnk3dKAtwLx153Q9rNkzEEK+QTdWMcsmPqOaHb/yAMdGyZIqx4DbXs3nAKNWP + ###VuVdZP3I9I9UUXyZTWmArfpBV0bOPwzUYvzSrCNFgOMs1Gxq1JRXr076J3/ae/ly + ###f/eYzCh9NKMoVaX+q7VfrcuLw+tbB6+oyfNc13kHf/He/UWUO+9z1/lFdEEXFNHP + ###XfqEMpmbxZl8RcxygQOk8hm3mwtCQMzfE5yxC/Q25O8JtuwGcSqtJ0jeXFCzM/4e + ###4yq7YRRIfdLQ3TCLff4e0fcoSFP+TgqyG4G+y99JF3BjX9UnLceNQfvn7wEKdW7c + ###S33+TijrJmFPxuch4XWTzA/pO7BDWBU3BSpM34FR4XzTJObxAz7i98xLeP5ousRn + ###UNj5e4zI42ZZL+bvEfXfC72EvweIeC4MJ+HvJFy4IKcGUsBDUQJexGFAJbwM5Rl4 + ###0QsZBJ4sARBGj0vEyDfgRRrxILwI+T8skh/xLLwgpVUC6PI0PJL44EUvpHHCenCV + ###EDQ5LBH0yE4AL1I/4xJxSlUiqMolwh6NNIoYlkGPJCN4kaUxl/A8KhHD8lOJLOUS + ###cRJyiSzmNhIYEJcIU5ot2u25hJ/Q5JI05l7SXuQxxvk9KpGmPqNghFWwRJRRlTSL + ###uJeU5AsXOJzHs009j1/ECcEjSHhZQXT0CWJon6MXvUCVCGgfIH7QygVxj+fS60UM + ###jzhFTuUCp86kREQ7CZhw4HMJojrwohfT2gZRz+fdEjD6wDhD2i4AEB5pRBY5eNFj + ###/AB+QAgJImDEbYQpCibwIo55tmGUcoks4TZCEtFd+k0l4AsNDEpyG1CXugXNl2GK + ###Jjl8gb1RCeifSsB4AioBI6Q2YMQ8W5hDQC96PsMDZklt4KypBMCBSgBceKQAqYyJ + ###Q0i9ICx79AJgiyUQ2tQtQD/mEkFCc4H9SCPFFaNecAWpBKwplYA1jrgEqR8uYQGV + ###ALygoaeyaRFzuETq8zhSn0eKuEYlAPuoBGIjlQD85BdhmnEJz6cqiNFUAnCcekGc + ###pxKwC2i2Wa9HpBX3Cb3AfUMloojxoxdmUoJ0VRf3Hq0+7MaAFht2J+0o3K89pqch + ###zxYqI8Roh1MJ3PP0AubLJUg2dpFKMEz9lBab6AiVAMrCJVKm4kh7evQiyxjqQJ2o + ###ClIrLkFytIv0jHoBAkd0HekdFgACyN8jn+CFBJKe45CGmfGeJXpK372Ey6cxgQIJ + ###MD1nCX0HAh3Sc4+XHQg4tYf0HL8jgadnoPf4HRgAPwdMNYBB9PiZxxfL+JGf4Hc2 + ###vrvEb/A7MKCMnzOmwhnRfeJXRGIjVJxc4mdM+3rcfsIAAhzn8knCu8NnmCO/FJTj + ###+oClvEoZjyflbZ4RfSJuTMML5TEhlFYP9M1lFqk/Iu8267pG27S8xL3Nzol9m6Mj + ###/m0Onxi4zI/mTxzcBACxcBNCxMMFhFwCmbgJY+Li5iIQG5dVirlEL/XNZXTL60yc + ###3EQEYuUmprgGKhHPdwtckxIZmd8LZHQNbOWRIj8XdOZx9GT9FL4zR5cdETPYkaWb + ###m4Z5urmvmKmbW4+5urk7ma3LBuYFruxxZuwmGWDOLpQi4TIh71Fi9VwmYrGAeD2X + ###QebOJKknY0bublItZu/0Btg9l4npSKygfczgTfLIHF4oqMwdWbxJZJnHm3SYmbyQ + ###aoEzcnmh5gKfMsFnPi88QeaOjN5kG8zpmbP40ldPWFwi4gvzepM/MbMXFsbjIW4v + ###XC6RMr04MBkh83vhlZlsuITHjAKAlOkFiXBcRlNi+SZTZp7PfJvFa2b6wtqlTJn7 + ###M9sXASGRMmnSExlC5mWIGTJm5PwiiagywuF8EYmY94s8w2thijzSDnJ/kYpUmZRo + ###OYkDUqaQrRg3SAAQ8UvggxKASGgyL0OIk75QBhA5T8qURUGWAkRalPVCMUAESlVG + ###y5xqzIZYKmVQEhDJNZYyhXAbSJlC/pW+MuYTJBxwGUOKFtxAcUAEbZkXygMii6sy + ###rKaRgCBlesSiSUJggmwI/QzDil7AQoGoDoGUKbSLSMoUCogqU+go0pehxvCYSTIQ + ###TSeVMloXyqRIRAQJZQUpERN9VNqUa6hbgZRI456hj7GAYChsrqHR8YYwVD5ep7JO + ###6BpKYygleKQoNEgJrXbKSAu9VLUREZNFuUFKaM1WgFaovomUSEIW7nqqF608B6qE + ###0q4FqIX6rdpIiUYo/dzV+nviqQKs3gsLMlV/9VGxY6krqr8rur/ZNFn0Ug3HRKyz + ###oTl8pfq7ovsr1V8BQKn+CkJK9XdF91eqv4KxUv3VIijV3xXdX6n+ahmV6q/W2Vhm + ###QgSl+itMUaq/K7q/gUlEXwxUI2RUqr8rur+BrKT7K9Vf4btS/V3R/bXqrzaNVv3V + ###vtKqv9p6WvVXu1Or/q7o/lr1V3vc3OJ82qNUf1d0f636u6L7a9XfFd1fq/6u6P5a + ###9VdUS6v+ruj+WvVXtE+r/oo8atXfFd1fq/6KyGrVX9Fhrfq7ovtr1d8V3V+r/org + ###m/SedH+t+iu2oVV/V3R/rfq7ovtr1V/xJ636u6L7a9XfFd1fq/6KEWrV3xXdX6v+ + ###ruj+WvV3RffXqr9iylr1d0X316q/K7q/Vv0V9zeYP+v+WvV3RffXqr8rur8hZbDu + + + +Valin, et al. 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Expires November 18, 2012 [Page 205] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###8d4xUzViuUIXNp8cjfAM5MzZAVrywYECw+kTLrEYLcb55pNjLX7T0dn4YkoYNScU + ###QqokY5xe4crjfpP68+HldDrefPISaOIaAnd3DKCfESLsTi4ASCD7IdYcLwZ4THzm + ###vJ2MEO9GiztpYnB2hm3CIKRIF1i3fLsCqfNy8/Xgjh/vYO9v+r00gafPOOu9AxQr + ###dneRGR8zo6CSauLwBlCr63y/dgD/40ZlykcWWj8nqqnmTdMG2E/RpI0sBtUr3EIk + ###wQ6YvI8AHXiQMHogttz66XT6QXr4EYT1qfPUeYmgOwJsmBF0d4AVA6ZMhlJDTUpG + ###rqEB2+ES6MVCwZph8X9vxmryJC/u7zKZsKa9jZrIYDRzXk/Pz9HaDbvvaHBG8D/I + ###aY+eOXsw4x/WnD+RpG2BZrsgpTuMEUf5R6CyoPRxuZ8BXWCXbz75ZXvn9WfQHwaT + ###OVAXVuYmoG4UDgHHd8CBrubWVGW0H6djUHo2fUZW3uybIT1cAzwBBkGcuG7Qi0oA + ###oKe3R/ubTwwKOxfsWYPVegbcZD5/ludhL3uGlAZgOX92PQBdYv6MYdLLeJY8wbXr + ###s/MnCFcUpcT3GA8TgQag/bOP3Batd7CnlfXulxYKH0DVJw69cLeg3fmG/I0eMDCH + ###38sjbNR3RqnV1ffPvfXW56V99RHR+iCp3dsplOnXdYwgqnYuX93V1XapfkeN6NnK + ###AS5e4exDPiATPqv9KLgzQ7suc1n6e4wHK+xwMr4z9NpL0JNdPntg4odmUZmzso7C + ###9PoT1WXNfJ+t7J0bnhR0KjRlJtEFYMyB1NABGTtwIFmck6uIeCQ4yD/HuZovjHZj + ###c3cHZOSXu/0XhyfUhUMLACNcpwcpSocO/cV0MRivYpXjP7/G4CHHViFsb6P69dnK + ###W9CH1YmDTcWJiMAO4nPzAi5ET++uNlXL+ZVq6wjlRrbo38pJe+GjQ3NW9Yu6mxbu + ###Koszt3cy+JDLyOYL7YTFPIw4mKGq05FDZYxt+LGxYUz7b0XPna2ttvHFVdDe/QlU + ###Kz2GbRR8b04XMzyBo6NL6hPPfYAXXl8zE8UzCj7bBGqlGjo5fFOaL9TabLeLB2to + ###nVU1nNfbPz39f2Hknc7TttGY69OoPiP6m1ip3M4KhHyA2xnvMEKrYv9tYsH14pWU + ###2lTFjU9qQ256pZd8V8R6PcH3uG78FhZW1Co604BG8gVDlUXIQqIhUUlD/xq5JOxs + ###JfmI/9sISLwgmz7lrm7YDp2KaOGL5Bw0Ow1Q/eGjIuOghJUFwDI6tqUTp6trEOgo + ###QAXbnwphjw/eztjECCyTF726O4v9DKu96pMdrN02X5Zw8JmJHSulzWvQaQvYsNM3 + ###/beEWUVT5vfle87A0qIx13fbRdXGPWM2QlqKWm9NqotjduiE4VRZKTUewHKNxlxI + ###fMTq8By9QRCX9Yu5OZbbhTGhZ1AWP84326p0x9iTz4pKNB/Fx84XONvXewd77fmq + ###32X3k9oxKney2nHSCTERc3uo9WPd2qIKVOCB41UDbiMScHfmwN92i/frZUpycw3y + ###cwOMm/zwcE4miZkzjPdev90Pg3YxSISciy6GNsa5m/MSEkN3W97v6+pfQv1x57mB + ###o1S3CZOQ5uRlDzz2BQFB+cl0kj9BgmT66yF6isCDzZo+ebXQoUplKMzWSy/O1uvg + ###hP2o/2D9CO8MNMDns80CWAzaGWAHdipYunm2wW2dt7+Dx46xm8/cMnChwO/nz2f3 + ###AE4jE40JwGjAQ/m1GbB4sEPbV0LJfLFYArb5PWCbbc4BbDAIBTXXp2JTFrAWjIYG + ###5s667Je4ugql3wsHVtIagLxMOauwXnwplM15qp0pznEGtMvOcBb5YxJnkxgNLZk9 + ###+iyIxw06zaCZDEk0EIu9/cPv252umPtuJuKwr1kfc1uPCTgeD/dBj8lnizaMY4ul + ###FNzlLv4BnW2qJploEorC6y14/Xbv4IT5G8O/ssTUgLtpFlWvLXoIHW8haq36av0K + ###nsHwkr6dErHjj/A/IOq6CLRtjKQz39iAtv9WUIK5bvNUasCUFhubOEFZzIUlfzM7 + ###lLEVLEVhUz6e5wwAeLm6umwKxYT7D5hNXWnpeq4FyRpcUw5PzfwLCsi1YEfuB5d3 + ###pLYzlveubFWRFCuyI37TdTfLMqTgTzE5XXTDYK56Q6tu/rbZ1iPu1OuwvB83Nqxx + ###WxOp0a8+00+mBsVIsNyf9g5eHv6pf7z3X7uuKcipNUfiY2EZD+5pu2299TUX9992 + ###CrBtbW1qcOh+3eJdVSIvgFsRy60Z16mVulmbUj36yfzL+P/0dZi+ixtQvy5/c/8f + ###P6re/46i0H/0//n7+P9UvHlC9OaJus5rNM6/mOJpH9okW8qLEcviDTIQBD6iJ3nr + ###n8e5x/bscVZ+pWuPcqdRHqZf595TP5Ivdu/5FoMxTKHOo5vPF7j5fAMvH+cJefig + ###Wf+rXXzK/j3oKvA1Hj617j04sK9x8Knx7mk5X+ffYzv3QCtf5d5T8u2BZr7Cu6fW + ###tQfh/aXOPfWePTy3L/DtWerYQ8v2QNeee/16oLEGzx5x7KHYtn/YOz7uY9Df79+e + ###HKNvj9zrLr8vYt7uHbQH3dOO024POhtt+OP3Dvz1HP7qFIW2fyoKbZUK4QVMJZ2s + ###sV+LXGwtQgsPB+gsM5g7Qo8osBJSiIFzPp4i67i75kNwIJNSnY4a4TVOCygbEA/n + ###l0qTs/XKq9G681m/G17frlP8IO11VAyVvI7Q6+D2ejyYDJTnxtVgOJsinRqMkUwT + ###fUX78zi/Rfp7yVxsp//67X77qktgUf89d66cTWewcsolXu399HLvx7YzdLpAnT86 + ###HSwxOsdJj26Re05RX0NPkbUuFHq2iaXWgPROr5nefxrNc24KtkobmTswYNXhc3zG + ###7oDOn+pSr44OX1NJ6HPQUaXcTfaD2ulvv3x5cmgWUEVWqcgKA4u8xGD4uy/7bw5h + ###b9X4drWKoAHH26/fwL58ydfF8YfGHPyEByoYaSyNsjCJ0iKW05/2XtI3io9cvAYi + ###1n/75nhnGwiV3yo1BZvJVY3SGBw9CloRAg/8ceIn/TDo/9GP26c4UauotXj/3VJs + + + +Valin, et al. 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Expires November 18, 2012 [Page 207] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###ZNJHSm21cIGpfk/qYALkGJMgY1JkTJLM+yaj1Mrwr4dJlzH9creFueYx0W2P0zhT + ###Zmf8EXOGXswFjfl9PcoYTUmkKb00ZZymJNSMoS2f0l0HhNOZDDlk8FEaYI+nR0PD + ###rM4hD4WGgbmhqSvOKG11T7nNKb82Zdfm/oquepROG39Qmm3K3x1QLm/K8k3Jiikl + ###OGUJxx+UdZx2PtHEHiUvp7Tm+IPSnSNhxITuGS8t5kgmMCLYenpgNAhPjQSTMPu0 + ###pYkwcP84HO6aeqW06T4lVKeM65SgnTK4U7Jl/NGjrPKUi54y2FOme0rOjMnu8St2 + ###FCBYA+wDkzYTRUfcoKTLOMhUrRYnH081LCjXeqJmS7SUO6ek9pS9PsX28AcmrA4Q + ###rAGlhI5p4AQZRNpWxqnBFZWivOFxoKeZUi56SnKPrSaS9ZloNWVBD3BYAW6bgKgX + ###bxVEW8oBTxhAeMaZ0zPK0459EMGmNPGZnghmnyZQ9jzFFBBvA9rZ1CXDLtZUj2AX + ###M1fEZcNRZ5wJXfVJKdRp5ShnPLef2DDCx5Doa8CzcXzhFzQwL1SNMfhojQnMPV5U + ###h7Kw00h6TGBwAXkQlAGeUDXTvdKiEBwC3lyIT4SUtAqR4ma8tpT7G5ONU5Z26Srk + ###riiFOqWDp/T2Cp49lZ+bgUVrQtug1SPA4IrgZuZpEG4iCUx4m/cI32gn0RqEAh4m + ###lC1CiEDvxQy78QPBhYSJJyEvoWwaqWXEJWM62mKUI2jSUAlxmLQyraBc5khECG2F + ###AvNCRIKUAI6IPtFECACJr7AUN0rE+OAHRBgIhyJ+mzIMWgRfmtpDGB4no34HEGaG + ###R8094AdDuvSDSYb8aPkp7YJMrR8OKSHe/KAe+IctA/APQjf9g1CJf2QK0ZCQRJUB + ###tmoHXR252lCh9SPTP2CvtGjbIzqH2T0izPKR449W4BEuqR9mhzgwxBQ9m7pRFuBe + ###OvK6H9ZsmIghXiGbqhnlkh9RzQ/f+AFjomXJFGPBba5n84BRqh+tyrvI+pHpH6mi + ###+DKb0gBb9YOujJx/GKjF+KVZR4oAx1mo2dSoKeishG54L/d3j3VOda2q1H+19iv5 + ###nknKeby45aAfmkpBr+u8g7947/5iqHaO6+mHz13nF1YB0e4h33xQt0HjTeBri78m + ###cRoG8jVIYMF6oIrqusCmSFHGryAex6CqFnWzBJQS1XIchGEMOq6um4LS3lMtJ3Hk + ###hSAd6bpJz0/1qEChR+NFUTfOvKinvvZAZAJ6WNSNYlC4Zba+B09ZVFQNvQQf+SOs + ###WJhGnq4JZCLK1EfQJQJulmpmAArAIfkYhVEvSAJVM0vRaCiQ8OMEPoOWr2rGccx6 + ###Pn5MelA11n1mYRBHZK3Aj1kAbAxgpmrC1GMyJODHHlpXQ91nmgGDSGSesPd6PrSt + ###asLEokAtHLC9pJdGka4ZhElPwR7WJYriUEMIbbueGhCwbhAIi3VJYljkTCAPf2U+ + ###Wm1VTZBS4kCAEKQATAC+qkllU1Uzi/CcJFI1Y1jBXk/VhF4iEP10TZCtklhGC0OD + ###xe7peUYATs+XZkMQBMJepGtGQYImRvkYhhmsvZ5nCOPx1ZKFME80VamagKti8HPJ + ###bBomaU/PM8gyj81i+BGthAZsA9AqNdaDmomGLr2eQCZ6oBLIRxhpFGa6T1AJolih + ###ZuQlaZgkGkIeLHbop/IRBKwYFlTV9GAlNJpEgLcgWagNDmibpWz0wo8RSFZZotYz + ###64EOo2ELWIBGeF0zixCvVc0kTkBLUNiXpbCeqS9TidIU5JhUwRY6RCO2+ggdgtSk + ###RpslCYw3EryNbXKUxT2YeSQ1YR4BLK8eLexHwBuBUAyiQC/TBAVIBEwzk6nEYWiN + ###FsAM6yTgi6MoCZFuSc0QBPVeovqM0fIchKomCKFEBfgjrIiXBLom6CaAqWpAAIQo + ###1nQoU5jKH7MUt7LCocwDVQcwUD4iFYgSRRNSRL9QoWbiAWB9jUPQClqCBcFgZF4v + ###7KldltIQejIgIL8hiLRqryCJiny1eQECsFc83WfiRV7cEwglUQ8Iod7ZaQzVemq0 + ###gHphFGcKtoDDsNN1swkZ4X1VE5Af1AZVE5DG81I92gCpb6j6BAIKG0AxlxQ0CSAK + ###Cgi9NIUVU3sl9VKQq1PBeP3ENXVZ/qja4Zq6F/6oRiA11fj4oxq71FQz449q1lJT + ###wYQ/KnhJTQVN/qggLTXVOshHWSOpqVaQP6rVlZpq7fmjwgupqbCGPyqM4poa3+ij + ###xkWuqTFVPlr0VuM4f1T4LzXV7uCPaudITbWv+KPac1JT7Uj5KLtVaqq9zB/VPpea + ###igrwR0UhpKaiH/JRaIvUtKQiTZW4pqZZ/FHRM66pqZ18FEooNRWd5I+KhkpNRWH5 + ###o6K+UlPRZvkodFtqKqpOHzXFl5qKH8hH4RVSU3ES/qi4DNfUPEg+Cn/impp78UfF + ###2aSm4nvyUXii1FQckz8qbio1Fa+Vj8KHpabi0vxRcXCpqfi7fBTeLzUtequlBq6p + ###ZQr5KPIG19TSiHwUSUVqKjmGPyoZR2oqCUg+inQkNZXsJB9FrpKaSurij0oik5pK + ###XpOPIstJTSXpyUeRArmmlhH5o5IfuaaWLuWjSJ5SU8ml8lFkVqmpJFr5KNKu1FSy + ###sHwUOVlqKimaPyoJW2oq+Vs+imwuNZXkLh9FqueahdAvX0Uj4KqFwiBfRZuQulrZ + ###kK+iiUhdrajIV9FipK5WcuSraEBSVytI6itrT1JXK1fqK2teWDdZ8wE7Qj/LXRby + ###fEtPc5tru81du83jdpsn7TZDzG0Gt9u8Vm7jOruNKOI2YpfbiJhuI067jdvBbdxJ + ###buMmdBv3r9u49d1GquE2Ehy3kVa5jWTObaSQbiNxdRvpsttI0t1GbuA2MhK3kQe5 + ###jezLbeR8biPTdBv5rdvIqt1GLu82Cghuo2zhNoolbqNE4zYKQ26jHOU2imBuo/Tm + ###Ngp+bqPM6DaKm26jpOo2Crluo3zsNorWbqNU7jYK9G6jLuA2qhFuowbiNiovbqPe + ###4zaqTG6jtuU2Kmpuo47nNqqHbqNm6TYqpW6jPus2qsJuoxbtNirgbqPu7jaq/W6j + + + +Valin, et al. 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Expires November 18, 2012 [Page 213] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###GXAOBR3CEboExCS0D9saxvPXvG1STWGmRfwwbAyap96HRKg5iBgeXy3ytgTCowxD + ###B2/3961LMmalSq/YSrfol7hLrV5BRL6ppXLIM265ZlZMZQlc+Gt63hYWhXWFORnO + ###/atOuwJVWRbX76xIE2pdrYp1CKFloMaa4bJ1VLUKPLBgjV/5lkmNZmHMz1mpg6Ws + ###5v2Q5KcVcsOqEbysjuYoV7StVx3qnFTl9pdgR0ddzERXL/ZR4fAJxN4Q8VhiUtfQ + ###FyWUVe2TpxiaICvYZ8jn322ygnv4h+rtl1J7Zzlg0PQOmtS3RWjWOKJChsKGBWJc + ###huEH5RTc1CIu7hGtK5uYJlSCetcko1p4Rn6/dFcY47gPcg+mBA8Eb0nGJAi6W0qo + ###IhiVFQBrTtYukIa/nJjUw/HhlAW1LHnlbDie87e/6SLOlhOUZkpDe7H9sr999L3I + ###INDAfLG5SagMlbEnfqqrur2/f7jTf7W9t8+1ear7u9tHbRzGbKVTXqkHbDAFeqH4 + ###JImrd4ob8Wv9rL+XZGwksPDWeLSl79IK+0Y7IDprbQTfwF6Q1rhnHTC1qKPlZm5K + ###vS8Jz1Y/KObbpUUydwQ5MZ/q9skuEm1diRsphmboD471oVAS4HVsCGJlqrsY05ai + ###HrXofLIri1GD03XEnVyFmohTCa0FZanGOQh9TLwayc7SS4XHe98Hfzo8eqkuuaF8 + ###Q3cIa2JaQJ+3AI836jo5VtaXsOUjgJu/8TVz48PeAX/gG3hWhAh9o+6WVFsxaMhX + ###k1/eaqHws2Vi0DJzfwCYdDcfzdv2FXygoytIhyhkBVTRkSL4j52u6UFZ85+hp1aC + ###EPy4ffRyd2ffGGfXWVxdd8ryOYiL3qbXhV++sj5hG/NC4tc4iB9OgcV+0E8HS7s6 + ###HU2EPh+jRR/wb+cP9Eg0pg0j6fJELbkDC1APyC14Ys/YNnKwCaWfFb1zM9gLsIVS + ###K0L3djY3fYvTLg+qgY7NV9fvRu/5GjqgxGgCT90SKpVugX5Je3ybl1vFn6tQAx2+ + ###dA+r+samiCQ/jC4uXXTvc1g5eO60fYwMsPLX/3F9kOjgV9BxnvFbebcWr/BrFliW + ###DLDmFutt904JGrgtePDqzR1fg4fxI7J06Xp5/UbEA3cogvQc8AkGdAdj43uwt+pK + ###KpfBaAi39BGhc0cf/90wGlabCVZua+pjGLC7kuVJg77YwtANdBJ0OoX0hNdhRzN0 + ###6Mw/sTiTs1vs6eDMOc2HA/Q2+JQ7Z9PJ78jb/HpwgZScPK/yK/RZqEDZD0ws0OPw + ###GLONggeVxcDt9PN6aWU4MEx/cDrf1IY0auVneP55g7fDzxbeSXkzQAw+qwgxNKYV + ###qrj6s4oVg7sOdhIPVioUgHr4sLW94C/FcI2pLHwgQQH8CxkeCCJcRzs2wh/xhBbX + ###bI2SU+CdaTU6PdpF0FAtWlor/KrODICPTGD/UgAdyQ1V+/k9iGkLv2MRbgbJ6ur6 + ###0grBvRWMrWGWMS2sn4175fx1azM0GjZp+qY2TlfbkfmOVn2Y8cHDZhz+VhNImydA + ###VUDEOTk80kxGkaa3//VfcsRd4mbw51m789S79U3CIYzdLKtN09vX1+M7FSMeXWJQ + ###FLsRYoD5iwlo5MJ+c+qez8j7BMrR2PG1FlnR68mhAsb5IIla0mQfT6nnDSozBcx/ + ###gRsYNrWWjkpyRN37KcZ1YbmCfu2/NrQMZJbO06fOd0bz1kbnARkSB4q0P+4e7W+/ + ###IaFfb5chBsLCyPYAkk+D2Vn7KUvY+K5Lg6OB8EsGaVe1qV5TDgF3/zXsyFrO++DB + ###kJCi1Qsr18DGxv5rs9gL88iGRB0AoxmroQwZe0Ms6cXYAdiB0UYZ64dAYdDebrRJ + ###O/EU3p9uvFg/tcj8L9ZeesYhvWbjfPBRX5YoMPHTJQbWPpuqT4ixytRa7Md71m11 + ###uNJ+sXKwqgTO1dMVELyewmK+O4VvBysv3i9dVWPazu/NNXaeV1b8RceAmQLOZ5lD + ###e3V1uLFjxLbA3bljbMY92o0UQ9Pcs99ue44mH792i/7UNc/NqrtTTLdNhWwbb+1m + ###Rh683rI2yX074GHbqSzmhwGLgiUZv5DOQa3S6GJGCuI6ZXyvSBKn1iZGjn9Qs18f + ###vkGDX7tDyTUk/wiMgXwZT8f5leHJPqKsHcUmUybdwdlZsdUMi8qt3h8dPYtlG96Y + ###Bm51wnG+TcZXvHDf52flbW9ucL27TwfDD9Xt/fQn3sQB7eLbVfjj9Bvv5s+tqjyl + ###7D22CKu2wvA9Shcg5+OvVQv56ZMlsJRllSXtrD94EOXeqIGDVWmijiCV5JDCGEAE + ###5IzOwQZkBdBbG1TB91akpJXr4RXv6ANrf8MKTFhJ6Vbj+K0Mp/m5SWlg0BVywML5 + ###zUQ5mTTuvzric1sj0pvf7yqVr1iDA/gZyiVMeWipljDj1WHNuiwTPXXzoMtA9ZVb + ###wI0rYxdfFVI+hjkDKR/BQxEE0QBiMj23riBGE1y5NbkQd8R6bE2FUFruOoFZ69aS + ###f2HfnuTDS3VZi+++4I0cWJPxGd/mwj0MSDsfneXqEuHoXOmiFrPW1eeFivppMJEz + ###jJ/lngrisHgiW8SABWxEhSJ0o5wg4IIc72zv7x6+PWkbZjicX6ekwADqcyMFci6V + ###UO5WN3fWS/J/gYslZl+o+YAqiEP1W660wYBDn/bZVmIGqVu5s6LUqXisJ5789tV2 + ###q2L3hWftzQspyoflnvngdy3J1Nybinw2Geso0xY8AlCf/MeZg/8/h///9+RJlwaK + ###g8TBXIA4bB6Rq2HiJ4/KBFiISuKjH6w3xf9Eh4A5oC/83/CXw7XTejEmcOScspTd + ###jhRk42OACSl9j9MMlj/6GOQ0S1LKOAkfP3fre4i4VJbGdT0kmQyg5mNzu2kP0y4m + ###9e1iNtweZstuaJeDnAJ4K3YDWgyCniDDe6AvHSnuP6S4r4sHDykeqOJ+zWB8u7hv + ###DMb3H1JcD8YPHlJcDcawDCkmuszGiCE/NY2v9MF7BG2j+i9NbO7YLIWhjcvm8NUS + ###+bYbbcOPw4Nd97zThSXsdKEF9wQA8yta8VUrrv9t2ln9de0EejzBt2ln9YvbOe9e + + + +Valin, et al. Expires November 18, 2012 [Page 214] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###+Aq4/tdUVrDw3V9XffWrqge69+BXVV+lPVG2mepdYVhOvwylkZg/FLZI8x8OyqL0 + ###6oNKB18AqKI0w+VzyXnb8kE/78/zcY6pEMkzOHr/LjPZ0S8ehpzuOvIL3a67/Oz6 + ###mvKbhQIqxA9+pVDAhThhZfCQQqFZyPDtNoSKsQ96AkrBYhQgERWjzjordNJlyPOo + ###FHEekLPFpSkIdEX6XsasMab5674vlwV49xpMay31Uh+zqJ93y9wsrr4KY0w6jblL + ###kc+VzwT3/bIT4elowOrwvjolNE89yJDQcLq0H9TYl0nE39qCmrbiRYVfb+/QRmvv + ###ByRbv2v/jJ10Vkfvy8+aUez7zuqmEf99PzBOe/b9ilagALr/Gtrc94uDQ1oadXhI + ###ZyMDPE8xzgoCgtuKmE908GmpGCyt6MWVikuL2n3w+AkqMvx9v0u1irGLBXvfXy8f + ###RJ+XT6ANq1Xl0FkOgE+UFbxrKIgr0BQoHVxmcoqWN3ic52cv7ha5MnYx4v8kaO9p + ###vC+1M7+5WnpqDW+6Dm+pjqG9zhee9eRXK10PFpdep/69b7/XgzVOxtnv9+r0zHAO + ###VgRKML9s7MKVr4Biw49Xdqz9IFOu7ISlB8gEaeYUxmqs18U0/7x8HJHW8HhaaDUL + ###bLStVkqqlZL76oBAXakUldFcfwlNQyEvdFcjYafsKdC+crc42fA7PDd3rUdkdkgM + ###DOwzGyCEqG+bcML61KpZqHtO0clu0nU+dAvzpEVKYZfm80V/3z5bwFfj/GM+LjRg + ###tNIaEx0BWzYmOuJJ3mcnkWNnMlf99O7nVbPB90Qyte0FlM7/i4YCNFCSNz9d5RdT + ###OC7yp/x3M75wDyp1Pi1MCHJgZJ5aNozHHBJHxOfH7k/vDrzV2iGaNH3T4K6EDMhI + ###i/3g/N4hwyO6ByI3KU60GepQvwD9s5VCzT53njDp1NOiOXyAOXxAQH+oP/dEy7O2 + ###16osBcVw7HmjQbm9/9r94PqdprNQLPdh1X9wu5eDwcwXaGxtUQ+YrGNjg/9s7Muu + ###+4GqfeiYXS8B+osCwvYwofyGAvdSA1DdchhfaC8oKCy1CJnrd4brV0YE12jsudGy + ###scrLAcvzZYpbVFXDsQFplnWrhRUNWd0sSpquJzyN9pP/njxRQ8Mscocnu8+dVzdA + ###2dEdbjG6opwFI7Ss6egKc7EYYrjH4YIi1cDHwtmMYzaAot7SfITZF1J+yugznzrn + ###IHh/yjnKDif4ucEjM+Aq4xFlBf80oGhdV4MPfJ4xmuN9qfObsVABs1VxbyH2rKkm + ###sWebdUmmH4O94j2QERCX05Ejp44U0Mx2rPEbCO/wZjbDLOjwy6KveCrjdelXsavo + ###JTqNajlCXvryEl2NjNEJsnC1DS5ZZ4/GMWC6NCxnIC8xHlh308PBPsYuVfZrK/vV + ###AxRzHpUhWxP60nn4S+bhP2Qe/pJ5+OV5KFMp4wuDYNUZnM7berO4ZbUQpPR30YqB + ###TavBii6z6hUsQyEej+jXNavsYp9bhUDGEocG/4Z0yLjtl9FaHbcxXi+mwF/z4QcV + ###SJJui5XQHdsP1kdbKHC4ro3xsIpKLFzFMQBUl0iMAncoVU+/ymW9ouzDfGpMAmA6 + ###1BRt033y0qclW7o0IPU3wvl/nHZbN/Kqw7eca/x29Hgq5wLwhV2X28YtSgpFNzmr + ###KjtVNUdp7LqHroQhc1bgh3nOBhjXFUXGqtCfzT+ab1HGusiLe3gY2HC9fKfx9Obs + ###wry+Jq8X+Zi5DH8HaMEg0MOd4g6vZLwCGElpE4eJf7VxmPQeO6rQ5ADwNlJ4e0RX + ###7XJnfj2gmL8c0QjRtVhwhbhrZV6A80QG/3rLQ18i7HsVu1z1MdObMSEZu7tZAyOE + ###IuOAgKksiNMKAgLhRdgKT8Adorrd2OR+amhdEUdOQk5OQP0oUPB/ZC0l4mSxa5bA + ###taCBBva+X7e2m5rN35g0lanh8u1plq5dwAgWMLYcWw8xKyKvnF41AA3ecSLZYTBc + ###3NAxJPB3jN8JW+kcRPzJMFdrKqTGWNenT63h3UNFvdViyu+/2/ySqoFZVa3dsgVT + ###O1LkawOKJQmlGX+qBOgLuISu+X7dlu74KM8WU41Rd9ZxSKJaqtEYdZ8YKNlZL4uM + ###VSongV6/nsqpIITww7ZM8m4wSOxvT+EsEgcDuofE4ZAfQuIeQKsU2biXUlkkSjb/ + ###N6dU1O7/bFaC5MLDvfRJA+WhROjXkJ3qfltOQ76QfjiKgHwN8filhh7UAtPvVHze + ###mxbwm9GLz+WtjJcG+8PBdZ2xlvYtfOvKniWTbcWMapisroqrvrUalDZaHWw+2PgE + ###/fO8scZwACLtGg73ndHXSjtY2X+9uuP6aKNfTaLOys7KwdZWUJkyDoJu7vYpcFOT + ###obpyuPLTcrcLDLG1P73YLRFBJcztKOv00uytGCsC2KJxKarwo+IQU5Oz/JZv4pVt + ###YjWn38qiiOwZ82xqe8SzwoGVfPlcZYGjxAYcr50WdIx+rBJkfGS69xmrnZkcrWS2 + ###+tkgBWaABkDxkZF62LLnlU1z6z9v2EjCL8v2vqJNfZAjr7polXyPP9H2994kTwwh + ###thDC3137+k4YFE34WafTKdMurr7keoe/dv4sEz8PPHeoNQiSuw19tYxF2PCWcTLT + ###6+EpjtcxNS+ND+5mZCpc9Q0ETfXDe+tnjf0H99dvqu7bt9B25wvMEplTgMvFDNZ0 + ###MRovBPfKLoQGIsKGc/0lyIjbCi1jaosCIg1XDNrxfsWIxdRpB0A8R67x3V76Ok9M + ###GPifMLoohhulED+fpg5FVse0AkRjtWEr5wmNBzOMGs4ZxMnajZHs9VnL/GZMkVEH + ###IBBcqEjo4+n0WmKqMjxoYs8waMbOSpsg0ClLhIxkWFBhGa4QVTSWKEAPpCIPc6uy + ###TO76sqrZF1bdcFxdN7qnrjg01tb1vQdU1lKBfrvhVUvaAoR+veXXl/W9WvuEWYQN + ###CP/h1134KQqWj00ZEb6SI5nMpobLEBe5zBdyrG7QY9it+0d4efHN8d7+4QFRpNfH + ###xQsdQeftnBXzfZ8S3CJuSy4gCmi1mE2vdS6K/WdHEgjK+chpMF4/O1ZvqtcYw+Z7 + + + +Valin, et al. Expires November 18, 2012 [Page 215] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###fl/LHH6pMiDgjPtd56jrAKiODWawz+dXpg59RK+IbRhvX6MQv3pkvEFY7btHNmcB + ###kK7ShVBOxsqXIfc7HWe1/PKoU2JKAPxq1dd1VY9LXIl+qOWznQ9MN0V03EjPC+70 + ###+pibYfxADA9NqkbOvpOc/f2xgAgHQL4orijH59p/vbHpG8o8Pev9wxVBq8nWq5mL + ###ZYiGOOiH7+lsadXvdFa5shppAaqtUv3a6l1eDPYJKoUd6ePA+/nQjixQOJgXoTNM + ###Qc/RHvN07YHCUHTLaSSG+rB6qetCvU0PlV91smsHXOONK7XwR9W3AIaA3XWWfEFh + ###bqlHwk81X/JJDmo4LvJuZ/nNe+GqNT4QGFOtTxFol1fngDI1/hM3IE7Maz4MB9c1 + ###bzn41nzZIChK9mhxV/OdtSP7g7WaiATjMfqi9q8G8w9StLixYIXTKjsyrUzHFM4N + ###9AL8kzUE9VdQBJErrrhYURG0QqcuUeibUzs7pegk5e/yuRI20OAVr6uGFf1mcvpq + ###hPnUBFsnp9sfB6Mxapv0RpfDQCaTM8NLphK/jo8m9WOhexVx4TDMJfPEzbpYmmWg + ###onuwb4WJQE0GALW4M6B3djMY95mnGm9hvDDN0UdjGmbwuvP+4hLQ4dIMW3d2N+FB + ###21YlI16cioVovKckTX29b6tfptN5JVjc6WCMeb8qNZQNvi6InjE3GP20COoH227U + ###16hrGszsL9OJ0cQcRFsYgbzhAD33+h4FGOoHyKIV6WdpjKCCbDorm1YMncKWsP8a + ###RoAspIiYQ3e84F3B3jnYkPpeuWq4uVn0ZLCNIjAos6mtUheNMY5QANj0tW0CXWhe + ###rywZA8/Wog6yJzl83+oOSO1GVCIJlSL0Aq0dBWKudNqlisGKUXW1Lj5bRzeItAYj + ###nKimV4F6GKPW9hqjeMDlqebS4joo2GRoLL02WAHWFvf+LXoi6FU61qUKdWcddl02 + ###Y0adra1Q6Y518YQMBDFCKz196tSPligV3btq10RpciWGE3TqFxHSVFinPYB52+/W + ###hXdytacfUWe1b/iwEr5tbMT1X/+GtuKNjXDpV7b+bGwE66ZhBxOGLSiW++QMj4Fx + ###OE9QVMcItaCTDoqos5Ud9Gq+uUnhzxBKS5B6c9MPvCUGn6GnY0a3reGWL3INvY3S + ###PbBlm60ebkOveravShSX4Cp0SlTRz0XgFzOgsI0oeFPNir2J0B1IZBZKcFKkt/KD + ###NMZ7dJQWFjsSAFcGQKiyd1CloF1sgqFUZrRQp9qOa28JM/Yax/eSBZRoYN9tloOB + ###Va2GzGnO8smmiRBbW1hpV2tKitttto3mVwo6u9qGFmCPdDrP4I/1ZRuzdm8aGKG6 + ###IY1hY0ONwYq6YzNyAJOqtLXVDle5Sm0wB5OxXl2XZ2baJZke1M90vXSusuXbLpGo + ###w2m+bcy3eUmWYK6iMUF3GQKVb0igF91qtGKuZedZO7NfuN99V1oCvVMr0K10adjt + ###lvMAOUalsIRP+3SIaqpGlUaL/kHJ2XSeaj2n6Egvs2f1VJi15ypZHWpNLq0pim+f + ###KFkfRZqm0IDaNPdxNEWrN1vnDDgu0ES34KDTlPuJMj5DOSNJ4p8k+9LZVHzWrtEj + ###abLQKVJP4at7zbf40bAOIuRoiDagC8y81zKvp0paYfaEFbWbHObyyfTm4pJTulVp + ###dyk+4DLbRyGtnqLv3XrtZ4rFxLCyrxL/Sd0bxiBVg8kdzHq8GGHYw+l5sXVAxafG + ###HaAC1znnWS6S0DpGHtXx4K6zZr2khHeYLW8MoqDKkjRHx8RPOfeqcgyicZXJ7Ojc + ###DKZu98GZTRejWQ4gza+uMYkTOiPisuMMHQ+x4fLudDZiLrlmXVnWgDIIy3op6pUg + ###lRB12qAkwmz6vw+ee9UtqdpZ1Y27Qq+LiNMgYLSZdq2GnU6ljTJ3sDlr2xzWRrXw + ###Ml/ZOnpjMZjVesSoZ1dLywoxmF/CJvrAHhXLCUDZG5fPfLVSVUeR8KS+xbRrV4fb + ###zJVyijSKP2zVCWqdgvDtLo/VWfjyY2AhlMMPVk0RvgiK0NF201eg2LKK63DUdKIm + ###qMMKxqnFqFps+jC9TjVGArxVkc+rAQ/1CLGyGmOtflAZLKsrLGNh7XXjpa9eYjzp + ###JQ3qVkSLNCMc1YQb0hEiSmeBNTY3bZMDLfO6HMNhSfyI0YR8CCiQkL1K5oPpXF4b + ###ea5uwxRBQrssQ1hfb1VMA6AKGF/jmuMXTuoDGBbU/Lv27ebmbady2/G2BB+T+I9H + ###17XlOQKpm8RxmOBBCQceVY+3nXL2jJooC6ZmbvfxS7nHamwFQRyY/OrmTikSQ9Wb + ###d+k8P5fDTnFkNEBDV0U3KceVYqFNn8sa+o2kBoCtowMJFYEoGFtIcKOtb6UZGL63 + ###S9cUqF73q/RLgT6gn849YVZrQ4VUm1MBRkpD01tP/QW6AM+uikWTaytmiAFtDhx0 + ###+ObPbdz8Q+jKMmTAnqqjAF1nCV1Y2u5qfTP37dquc1AcfVgHsjudItGCcTwnyF24 + ###9oavOnY0EotmWXtDifjGFc1lHoLSCJ2t1DtC2wY2tZX5ZW34pT1TZqVDZUw0PJUT + ###makzRxtEKVEzyNtXN1drlSAsJdm5bjfbgv9mhcluLlFASgJDUELLgnNv1vLtJpmi + ###cDH4dXKEDqm1QJB9yn8HsvU5jZmCstGdtPwK+DLlj0Ehg062MEPNvGUrVyDa/25O + ###qWokKNYIPUVGIMQ5ZyNk8HefQMK14C++cs2zJ9/qCfbdJ4itbmI1t84oZkavLENs + ###yw9WdpQRgJzKANc53GJBFEj3K3IDqeJG1O+tTSeuwcm6Yxw24YOKZAJebj2qT12n + ###XbfbVw/QqlYTmVl4CFUvQv60SawxGq1vEyUfcyxcYZ4PZsPLYkirtSNCA4bVxUFF + ###EK+r5tadXXSdp8bxRnVEymWgtkGjiAkSdf4B2Ar0EGBzc4rae/seoHRrE5VVpnZg + ###D7mruJ2V+af8FodUNvOZE9yqn2ApEO0DQGLSAgWHZTF2Uw5EQMXKg8Ph6wRSW6Vx + ###qIZ/2N5/BWLTAxqIfm0DWX0D1sWo0smPKCmVZFDLpKxKm/qGF5DF7zl7tJx9kSic + + + +Valin, et al. Expires November 18, 2012 [Page 216] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###TwaEV0TidOfPrqfzBf9Z0Dfz3MwKK8BRBdaNjrbPMFyYdobStU4Hc87LpQ0umEJ5 + ###NLlBSmRZPfCGlYEpbh1+dlZ8b8vceAYYzbGu1g12OWHdCOIHteTf31L4tS1VN57l + ###bRdRhWVtu7+q7Tj+8saLlf8BDySK0sA7vbVgKQ5xOHHzZbeyVNbYCb03zAq1caTb + ###ZZ5Ix0l+srFZyCidOnnDlvQ87cDdsGHxPNZpvMf4bIUMX5yEgAS7hXNBScpO75wB + ###i00si/BFvinetKmJ0Cd+VxVzDNcip8E1SxoErfsvF+v2i+lwMfiYl69bs68Rzc+t + ###Ifob5SWvIWSb1XqGlF6nEv8Fs6C0uddVH7RWlBG8zrPQ9e3A/bosBlQ4H0+nM0DT + ###81WquBIGzzDpZ1XXpSpksfPEpJ524aV9k71u2f3Sspsca9Uwd+CSEDTRkW6nv7d/ + ###+L1JszpuXO0J76NwL1y16yT145lzKZMGtgGBN7gaiC7Rqvy5ZKSuPdJKy3+56Dph + ###mV+ZQuhqcO92wWTBMs4S3+qa+YRLQSzL4QNqeJ5Xs+sM9zavF6YS9qb9l4tVe7Vk + ###Q/rrSy768x0qdpq1ZCDh4JhFptGexX5IlvnQOj91i/dm8iHLrGAxsk3C0noRrE6c + ###q1e26/TprumLMLRdEbpOxTGhQASeYzkCfxEM837lvUn3rzGOPEQAVW95cF2nhlTV + ###v7y3P4W09W/xyKtLV4RbXwWMVTXgBpioMq0HwcXC2wO3GSCE1/c0rKZaDxI7aHMF + ###vevxsQnzaiF2UMZIGyUPtmoNT8uMHDSQ14c/7rYfZtWStTm4375Va9v8iu7uLbVs + ###MO5ByfLyZZ2v1rfZvGWdg/tj6O8Ua1a661+c7hrX/XQeMiP2t+mmr+5RWkwprDCl + ###XyqHpYVxw6kLSmGPoSajFu6aA5ua7ewsIyJLCOjSODv2bF9X7mzXSSTWNdvQTOrE + ###5hf0+qVjoAPzvIfzUu8ZwdzFOd/M1SBJr8h9ter/tQLzdrSfsBnnSt+FW1KpnD3L + ###uJJmdm9nKFFtde10B7geaopdR0cLoutx6CH19GlTXq7yMQ+2xFcNOQGV6O/yGoiT + ###+eIAowF27IBoVkrA71S8jF9soaHefUodNx88q/hEVsbNZ/ij8j04GtZwBQdW61tp + ###xq+vTr7UgKW31KXD0Ov9EwBfoxfHQzMUnBKe4XcylZ4Vi22uNiIPYdTFKDdXnReZ + ###kVFOabt4rVKtOMwyAKQLjCqqlJwD69rFXc2d4pgW0VMPjm9BihuXGjANrTqkn5pG + ###JUHl5OJ7dT8YMeLMC8NmBMXqfHaqN/ypedt2TyM76JKn91OJf2je1hXP7dGGOiZv + ###jo7CxV3/vTkx8t7H1a+bWXmb002A/nA6mAEsaYXvzF2t1HJjvdSE9YIZ2pX2qy9I + ###vtwmwJz1Q6PoDsOgrBt3y9kvjSpPyTZupG7v1tjGI36pbXiy5EX8l7op1S4cDs8M + ###90Jmfp0Y1E4wj4fLb452t1/2Dw6PXm/vF94NJiuMmlmhwWf+9rfy1DacEN9WbAkb + ###ju9JkMlqcq5ywlAMm1M5M22YysHuciNJfVV+g/lz1UsDm36qsGRa0sUUdlUf6BBG + ###dujWNdzlgpfnulR9Q7bRtcuq5dOn31nMqUQQarl5oSfXjkZesKocV9n7kDKkNNEV + ###LicXZJrK8h0AFQtAwxJ7AATdqcRgr3EJN0iIdPjO4CRAZV/eTQZXoyHfAmEqS3Fj + ###dEy61xghhvy+yH/urKY8ueFSJJmbOTnYkelLImcUN9BKLoxbTkwSI0iOJXmAXL8p + ###V6BpTtx/jUGE6mRECvcVmoEuAn0tvxZ/qUJQrhCVEUIHgRCqseoXxHnp5WYzfIDZ + ###xRl2EawUd57fu8XfQMWNJyNoV32wTdWcCD/w96rV9GoVE967NSKxOYDaOuaY6gp0 + ###1uuP9tmwa8btss/2bXXMwMySya7cTtipZCyp1l81y1t6UMlOSfeYA0DE4x/2MSqp + ###361cX75vgOUmggc3YVlAC486626TDrtbsI6NjU3DA9y4uqQ3tR0Dpn8+GwyLc+oy + ###StdIG+YupIDWXRYUBmZ8RWOY0+viHpaWnNVdqvLNYWoQjxJXzFsdRsyR6ls79AhQ + ###JB4NGucTh6UM9COdTM0bAPjhGQvaxTKwQOmMc4zER8WeZUbB4uRDehBHUhqzcnrv + ###spU6KZ45kLtGtCpkMH5R5cYa7j5r2fS1ao4SQocg7Wpjqt8OZt3UWOEaiGChHdBX + ###7mZDgrasOz8vDRByPh6YJxD4CIP5eaPA3fus8VilWwOC5TGKSvhpON9hW/YeKm6K + ###mQCE7WTjZ2lf1H2vXaQaIzRyPzwZVeUZxcajD+jEbJ2B/typbZ0aVlcFrPdGRGCL + ###Mxd7h4ZR3M60Is0weiQGNmyazriuCQFrV1vt1YXdMUW2Ojm/uGjFYvKOaW2qiFBF + ###D10JtEByU1rk5G3CBh2F5MfBjMPSym0NQ6qov35gOKsOxteXau2tmzVjjRKYmwvP + ###vo0LBqOJky3Yxx+9hIuckJUrK1Sp2v7VaFLyuqY4aFd9ipxhnkdw6jzXQSLXMm86 + ###FJ7u6OOrXNMZW7a2pKkO1Gy3I1AEVgOvoxFCNQVTO0YJ+JSVC2x2wMFOZPvARAWo + ###TEfnI3RHAgHuTq85JsW+AQ3q6oouTKAzFreGH+iAFDYm3pQYkISXF/kOa3QbCYy8 + ###4bgB84Bc3O6JHxlcUwMhXeE/nykBTQe2Kdp6WEuhaikot/TaND+qGu5mm/9Y9aPO + ###syAzYIroggHS8uKICfgR+/+cFTkhpWdkPJSxjYJq3szzM92TxGKGyoOzs/xMAY4r + ###bkr3RUQ8SfVqeSAKbtIFXrr8gktyir5zeC/uDLu4uhlesvyuQkC2jKt+FNxGYtrI + ###3Q1ndjMht7vpDcW9obsureJuCN7nmV1AHfgWyO0Pvh4y534m04nOYVd758ZkPSoc + ###LvVMGezono3cyuEpAJQK/0ljc9GxNJFDg+SttjEWenFvA4itdY8D5eX6S3u1NygU + ###GpitBp2O1eb60tpE/o0Rd5ddGqmtW+vcWS65as2ks2xqaFW7cy6nnxgh0DPyU+48 + + + +Valin, et al. 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Expires November 18, 2012 [Page 220] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###a7yNizRu2UknoRDfyIo2wMp8RGnhyCARc+G0Oc8TuUmy49V1CwVa20isIVGEr6EN + ###bfwLJN3EdI95ykX5IZ87kSdu423oheK+jH0CVEvRRDOOACZ4ZKsYZ2/e7CopyvVZ + ###4ak5o6nJcRdFVVO/Bt3pbZlnufPUK1JKl0bj2GgT+ZqP4qTM1AZ06GDlkfceYEXx + ###DuBp8qbItYkZ54cj0I4x18KtNwQFEF685HKUmtwMBV5G6aZ5sZfbSsF47xUQhDc7 + ###9VmmORTC+Wb8m17HqmkSGWhgSVi0yGV+FE4tHvy0EorJduIUqG9UGQm4N2/pDdpx + ###EV/2zRX5nnqgAD/TOHkStropZdKUckiPEDIUwAgDq7sGTekyYMXy2opkx9wAxSoV + ###iT5VMiRPc+7xJFrixNMP7vz+g25RoYp7WrZqYwkSRbhl/XnFUXfbBbMFx7ZbufPE + ###FFfSeST7T+VmYUKygBYET9zCXWmD8xBrel+SNNMT+uIMLxP6PjahL81GNT73l7v/ + ###Y7LzqtD4ll8yxZ1ecI/qH3wF6r37Pmlrq8+ctpa/tmetfXTGWiTqvDlqCZffK0dt + ###QqXQ2IMkh0fmjs1FibS+NV3RIJ+sFKFPzgv6DElBC0+7wfpMKXH/WshM6LpYxtwo + ###31DBnuX0iSlO42SkygkPpjfVfmIqUsu50WkcHUdLSGlt1NEbdbIafTZzoe2GYKrF + ###UBNl5W3FDMNhId/Vx4XuPc659GgbzzebeXKxEA+Pi/Fgy8361/kZ29NSsn5T23So + ###TXehNqnFd/Xjo5pbrB+iA7Z4XI5AllSWSudnJCXAjH/xQcfWLNyPyI5quTmqKtsm + ###nVkdjJQkpknfo8wMptY6Rl5U2+s5zZqel0gcMiuq/J7RdoYX1dxcnha/KWujGQ5V + ###1vI2p6p8WVFtKVHtCMrOhzqvTArWTBPmIllRrTjL65U23yMtX3LUVDeBVAqSSTCt + ###sUhTCCRZJ3JWSSWSZB3Fh8TaA7rOa3GXsYDWi2Z3Ri+rOrKkpyldGHGPwt2j0Wcc + ###H/126UkXyrmZN5ep+6ypTN0nZjJduDUjjquSwzT5ZhXkn0g6ra7hLdlYPrUlOk1N + ###q+p+p6yqy0Spf0+JUt2Skc6UziujdKaZ3sWPdi9Oib6YlWw0UoBBcd9ewZPxfPlG + ###+XlmnKoUm1CTwMrYrI4amTXjfP8pqUnFYc1zOEbLBIpZjtGWLHaGizaC5K1Ty4mE + ###do/JPSpAxGn7njBUmdQvxyhzJxwFMv7tMo4qp0+zqS3nqJo4NHtyqAHL5MSxdmN7 + ###t5a7EQPt6jGmeDrJXWjRkif0GTKEpqUI/RuRxrMsgN/HWs6Z4/Q3pXELiSuZTp+B + ###wh9P4npSUlbkFJ+TyKW35QJJOtVwwRmU8f2TdC6zWv5jZLX8B0tjF6WIwvmiaORc + ###UpuTtnIlc2BpCZVUDpc3p1KcmSUpIVYXyBt1fHb2Y/0desz8DkYmmLi80WvxWP2e + ###uQf74045fwbCZ7mbkpZS0riroqXS02+tZGQrdB+RotB9VF5CS2qhzLyEiQj+j8pL + ###aEtolCMvofs9kxHmWHHnzcuDd7+j1ZZq5LNnIxS3SJrHh/+gKfV+v3kL/86T/Wl3 + ###gn5HOf8S1bKz/hUKnD65mkQ4RDGDbDZRzjQhKIskF2oFeo01YOrDT9so+cs5+yGc + ###dTp+GP4gmecPwRAQG3QZDG828IfT+I2IojodjVg4AEJS68BSxms7BCl+jgEYZ+Mp + ###XushqSh+I5DBhiPYHHGrRVB+N9kNSqAXP4YtbjR5YLGbFOt5QR8q0sztaCmGyBUc + ###JDj+4w2rbBk63Q+z4d0QNnvR7ZQ0ODr2KvTzM01LYlJwc8GTWeiXqFDEZCNiZiKw + ###/eAai7Mf+Hx/aFy0mmenkZHs6s9/BgagrIEfKr3ZX/4Crf2QjAuEHfnD4z+clkaz + ###Scd/iVroS3LKWLv9wzN+MJP15uY6/YWP8dep1tarf3CcrY2N6pZbdd0/VB13o1r7 + ###A/vD39PHHNzfyUeEzpsEN7dTkGNKzK1WtyrwzzY7aDUvzsjQYS3wiv0UjG/XziY3 + ###7AjPYGg1Wotv8+JvJ/4Nrt0T7/6r3+9j0Y8ieNb1A/vfvjesnHiTDvsA635Irs1G + ###DZ7bk6wTfjfA9XU9IxaAZWd4CWrIOCnTk+tg6EFlDEcZlnnQn9GE/o5mU2wF9uag + ###F3REwEBv4mNkxwH2qMvGk9GXoEtBWkQIr94IeA6FVIVl3w2wEkWixnoDH9g6/qgY + ###XQsxVJToE/kxDkAaRT7gifsZ3jUI5vBKoAzbAJYYoPceRRQjmwe0EcOksekdAoid + ###vhcM/MlaSi8AmoIO2QsYZHfW8b9HR8T9EzolGXVoI/HkXL2EaRjBywkbAG+fBB5o + ###yRG+ZXAmpg5ADuvUD6geRdnB+DrQIbr8OfSnrDXqBD76BTYbl0c41fT3cjJDQ9KQ + ###x+ahYVFkJ5yXsd9BAsAxcVCjCVDKwHvAKD0zvEIK4gEw3BH62kAD0MnBaEqNcNRN + ###McrpJMB7p3ixnGMqHPWmX5EqBKnFcMh1UUaMK/BIooMgDKMRXr5rtljr7OjyY/2i + ###weD7+cXZh+Zh45Dt/wleNtjB2fmfLppv312yd2fHoIi0WP30EJ6eXl40968uzy7o + ###vv7/9//VW1D7j3+kt/XTP7HGT+egsrTY2QVD2aIJLQIIkOYum3QD4PTg+OoQNp0y + ###g1bY6RmFyDtunjRBAmGXZ2UCnqzJzo7YSeMCDTGX9f3mcfPyTwTyqHl5iuCOzi7I + ###AsrOQVFqHlwd1y/Y+dXF+VmrwXCEh83WwXG9edI4XIM+AFzW+ABSD2u9AyHYGPDZ + ###x9MGtQZjUAfM9hvQU7SzIzga7WHzonFwicOKvx0AGqGTx2XWOm8cNOELttX4qQGD + ###ql/8qSyabaFoC2OrH7PD+kn9LYyxmMSOihpsBqbp4OqCJDZESetqv3XZvLy6bLC3 + ###Z2eHhPZW4+JD86DR2mHHZy1C3FUL1PzD+mUdYYtWAHFQAorvX7WahEI6tbu4Or8E + ###CaEEs/4RMAQ9rUPtQ8L12SmNGZB1dvEnaJfPnJiNMvv4rgGvLhC9hLU6oqMF2Du4 + + + +Valin, et al. Expires November 18, 2012 [Page 221] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###VIsBSEDmpTJYsmY33h433zZODxpY4Awb+thsNUoweU3o31tsFYF/rAPkKxo7Thr0 + ###jX9tEjlKgi7T7LLmEasffmhi/0V5oIdWU5APoe/gncD+WoFOTMT5GloyW+13UXph + ###+RsKDDv9GbDXHzBw/trtD8oT1MBC/RGKmsNO4lnXN55hRkV8Qnmepe8dMUtMuTjF + ###MkWMcshvwj2UkOn5Hk9mgMVIliqAIvS/xt7EA7bLSANFq77y9CfWAgYxncwGykOq + ###ylq/zJCRTEajKKMBB0XGBQJFN/GKXLL0QdLETZInuBP+gFigLa/qJdOVStU3Diz0 + ###k3IVHuMCkWGKtAy6OIeRZfgf8hN8uaJBG2IU9IXB0SPVLjYdob84MnOzKxR/mibk + ###VDoSK4gAJP3EQKW5jfdtgTA5NVRM5JAAHQR0FuDxzgKTFCNbiTVQeuzUxfNl+kXn + ###QF18cMJ9OqPQCOqrn7R6eScVL14M0xAMGMPm8X5RbwZyWbQcHofGrl95Vkwmfcyz + ###cWnDWDqOF8WlZFbRJdHThrQsVkvm22Pa6vhbp5SsixdM+Vs38bb+9i3u8c0PDVas + ###lfj5G79ngtlh5VUTKy5iLPwkshV7oMZ6N5FXZpSKPb6xQsVue21Zkj8QHnZ6sdkY + ###yMBv3/bU5uzI4irwSaPegv2UBtw+aTX4vA58L5xNfOppexD6tqGIk++f4m/V6KuY + ###KfVXVcDWEnkexHkDOOBbz5s4xSSWTkV1JJCuLxfOe7ysEoQk7r6EfWbUpdQ0PREc + ###IQzwrg8JhQbPT1syF7JO0b5MlKtzl/iVDWeDayBNAEkPiRV2vGEk1cpAlSJGJd/v + ###sJP4cDQE6djrI908YC/JsTCCBeNhDZCWKdz6kEzq8cIzL1Txae7wVLnJueKoo4su + ###kiDUMCRiWf6k87U/lU2vAfO6TtYKXdFvuuEjjMrc7o4G5E5MfgXkgm1EhCvrYeMk + ###tWu3s6zh4sqWWHEUlLEzvWcreFtJIUD1npZmKRX5zDia9atLc9Zzey6+ZCg+ZS2G + ###ikO2ZZb0Iyx+zUl5gtF0HXpcSJ544UuX11EnJJGxEkerPtPzu9lKx64IQi5EuvzD + ###8rOY/Y9k3s4ffjv734bjbmyY9r/axvrS/vd3av/LMOotDXhLA97SgLc04C0NeP90 + ###BjxU697VPzTaMIij5lu04kV2Nli+veCGbG9C7YrevQEOc7t2u5dt0Ot8nRhPknbA + ###Ecg5s/F4NJmSSU+z/CFnTzH9acfpuiR9fPbWbR/BhLQvkXo/ueufd+mgt0o0tV12 + ###avjF2Sw7r8quU3bpp7tedjfL7lbZ3S67r8q1arnmlGsuvoJ/a7VybZ3+v1GubdL/ + ###t+D/hW8p0XlhPz30p8iFUG0D8fdD8bT8Y4n1UPHDYzRotAJ6SNx11GFucKNBZ2Xc + ###AX6kHRB4K6jU/S8+7hSwh3Le6WyQCrkGkygQQRoSxusLhjWXNLy20JvadzYPBMWJ + ###e+Ddn35yNlT3A/Ss3yobf5z1rc0yc7dr8LX6qszYJujZbL0a+Xe5+BDwCP/gG2e7 + ###TFiGf/CZU/u2M6cbP+bphuyNs+VCb2oI5NUG/LNRizpSQ6AwlfCPq3dkQ+kIOiS0 + ###h3u7zroRTBAe30WPNZ+Dqj1GrnjbHmLEHEJn++6z7SabLHgnCv74qT2UFw2/FXQD + ###MWlg7Y7XueUe+5p+jgFsI+f6gzh+evTt5zhi+2wyUcKRD6/RThD4ofIMltrkAWig + ###iiEb6MeP6o8m/VDix6s3AHwZKmcgIxtQwXPs/QF2HjRb+rPLXkAR+q4FZcdGOnE6 + ###NUMrjkK7m9qydDjvyFy11B45oBRRTx71igSrskcFPlU/l1YGSmRZHipIRG5QCmLQ + ###H9EbGSsDbTSU1Krfh24Ev8z4EQKp4/Kav+JVuAstO4nAZorvv9IN9QaA4finxq8i + ###qxb6mIrYET9jBDP5HeOWBXt7anBJPoJPgTpinl5di0GJWbMCtB6T8MfNuiSX32Ig + ###zChBFg8/b6bcuYOx3L3ZDXbu5qS7H1qSm2GA/KGKCIwuVrz7190APYOGb34u7Qzn + ###ZjvDlXqKsWolWoYKWoaIljvMy5wnWVY6wsSbO+3N8LMtQ5YZdcyWK+2bNSsOjkSj + ###1mRHcOoQSad61IAkun80MmXytR0texzTqV7kx2TaMXHZMt5RTsvoRMWtQsUfMUcY + ###duZHnkaq1bg6PEvg+cc4+rnSlR/1rhi9zZgHYGOW5pp6c7yU3iQ8wtBv0Gm9flRR + ###6+e3RLgcEcQsyV/02FUrCEjjJ6JixMLEYxFLPRrQS/0Qk3NLg9+ksJpoCAl2Y7DL + ###8XQierIq0Bbf+1YY8XQw5hl9ro5bjZaSRhsnH30Dg4nf5bGlMDegJC68V62Qh5hn + ###zEnKRDysHZ0LOsAFd6Ni5jWo6YRfg8LeKM3+XPoccy8sRFFp4lasIVkQo7DRBoPZ + ###ANPg+cYJLfA6IHX49dX/I2B74vcD77r/QFYPL8poP/CGD5wMvBBKwr932M6aDPHC + ###5xWjaeK8euOs3QhL0WaEG5BTWnFVUtfCZYq9xL6THAAOD97sujsH1g1k/m5j5R2n + ###1WRCX8BenGAlDqJWVbd8viEpPw3+iHm4dx2xw4yGgGDaYTwKK4+YJYmXTs1IrjXT + ###MRKnr8I2h3wwydFlF3m8T4eCDB2BmtcG6mtF4QDnZBBObAvWu5DjWIBJXGngdm+F + ###wcwG+Qp2/WGiIKI+mfT8pJqv4Gm+YjxaYb6yw+6ol6/kL9f5yiX3ShifNQUm0E/j + ###iz+s4FLqCjK6Dm5uyGQF0tnpritP0kI888bTMhGlNRj4a5a9uh5yo9sAdCq2vu5W + ###a6+qW8Rxeet7Dqlf/hef1Ch5EsdvrTCu69pzhsLK2GP5UnSeVvf2zBzaESLidCEp + ###ooRYV9VoYQEG/jiNcYD3pVBZPH3jrlnym0bx6aHDb2yr6q/2fu1SBLKg7FizhOIq + ###3bWRqa3v2raHEVrlCWh/9NUPp5U+oL/Pzj+8x7nyyKnhgQ/OlnEUkWAb6FjqH8Qi + ###VqWMAfy3igxYlzR2MngLb+iT+FP9/HnVsVFqvduVYb5pUERnRD0T/2bWBy5CQwht + + + +Valin, et al. 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Expires November 18, 2012 [Page 223] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###wFH84T+67IeybK20Ix//1/AHHgKEticy6ZnmjZxDxNv7p2XVJ4oilmuHCFTuAE9o + ###1Cf+PR7PRu6fKleUo9ds6nl92E530aslTg2toDKyXiqL8DT2OVYYIe+cVDpEExVu + ###qChrdn7ZPEyLMaJHH9DR6f3ByqlxLke2IG25woOf38SsLD64K6md4KinvCvDFf2s + ###DI2wJaPD4oBPdvYJh3yPO92Lz/V4x+kMD7uuneMVnvEIz354Fx/bAXDt4E6fX8wm + ###FYV9iHEn9RXxRhhEuBknmHR1+deUcczexdqngPCGJtONJPKUnksMuobZL6vRWt5G + ###awYmDoMvZIlDNYcSSuHY1ZH4sVxEywpYR7ITQPSE7yLvRAWE9hJ7KR5KZdOAfOLd + ###AYbRqIKqH557oqpmIvFgJerAXgR4b0+2qWsbcVejOntyrcI3KcPr3YjMn0R6QJEg + ###nlJa+Wu/481IhPSmfwxR959N0WGi503wD/rMoRHnZpSOL9g+5O/kQarWDS5I0wxg + ###XCD0KwR6BN41povcQojFG753ZFHwEHY36CosKkGdIAypNDoGRq3fMVFPwHiXZW9X + ###tKlDni6VFLlLaL2/8AfSMBIrPRHr2ZHxX6bk8And4MelMOeIRJsQXsFzYtmZWPvK + ###EPnZEWDhdNcpcw9T5HgwMwBCRQEy+7FY6iwEUu/7sX+0NovaVlIty82keKDSc9Z+ + ###YiMI1evQgnwl6X1BvT0UdZ97n06RBLzuF284RU+hKLxOhe+U3OSgEIMZm6akWX5h + ###eXhAV91RshU0oKhGpqLAiqKAGudqtElSIvQd2wvjWDwuHS0WArC3V+SLdlWguqwt + ###nYofiUYWLK/u2nsR94CpJVYOLMq/bWHE1ffkJFfUg1WNbiq7lhFHAboj2W1RaUot + ###4CdLRJmnyfF/+GAqAGSq5vdfxpGoMPFtZJOkGbE8ogN8ZkhmwhNGM1PzOx78jCAQ + ###VnKEqyxJ7TxHkYVVkTUvX08iKclD0KZmko9lgWawxjdOjOzUXEGKAC6zRMlLp7FN + ###NK+7huJhwblvmPS6iN0EppNgYPek0LTSlMhNurdGFLVJC1j0fVwpYrcJkffpZ4tX + ###ROw3EZ0O6Y+kup/wHIldIyzGAZkqC95zxUvo3YnnruU5NxbbXsBMtFWHSNP5ghss + ###pLmeo78qdeoh15y0vCDxqKWNRRqeLvjpV+JYUByb4i4x8Ib8XFc/ShILUGJP2gaQ + ###r0R2T9RRou+vxTLhxSrGKZrSl2i9L2wQM2yaaYYbzR9YUXAzDaKADcMkmrC/7Zme + ###C2abtkvqfzXPFyspRlarJYqq7O1mY9xoPcXMFV+r5PnXhDNXn1+zUTPAFYVXl+2V + ###dO+yvosJWytgsUTY+DnGKfP7o69cro3OWsrikE3VCSIvBdzOUFhULFmIisjlQiyi + ###4kHk5gh6Sm1ljqegcTyiHO5fBn3bKZahhyqI4J04yIa4Uox5dGWjcnwCT5Aef64Y + ###d4NW8JQOry/GTrGbSu/egtYG+zWpKYCBUZ8Hk6Jlj0JthWxjQQeTI8u7XJE24z+g + ###LTwGRw4g17Ad94KpOHP2qHl0HemMPIwgxPOZkBU/blk7f5yLacwnrRCxjrmK6Xv2 + ###LXIsc2LHMmKHZOL84Hcw4hGriNd6XmHpAaeuVNptDBeyhLsZShPOYxzKkCx/tkQT + ###yHd9k2pzv268K+UpI/yEjmmwxFZRhDk+0a0C0iDws3EmpDQpdXb+e9XAeynRCRCf + ###hYyhd1EB9ftyeKNOLeTyFg3jwG40USDYlINHOLxFZJrq9AYzo7gWRZ5u9Po/umXe + ###UuThhr+llxt1Q8QSgOJvduldtGT6I3HJ0eI/50+/ok/Sf3ALl7X1HNxckr/zsxCR + ###ftZMyPkWAW8gZQn0R/YVwKExHPHebpI3/Kdu1yQCga3UBuE2sEOQ5OKYKyzqr7q+ + ###nIwFJltybS25ZkvunJZgoq39sa5e2aDtHTYWP91Tm9RkzZ8TOFcMI+7PFQ5f06ic + ###WGNz9OrxC0ErPD98fKq6a/NtH5SlYkRKkeK/zoSEI6SZyDEd9CJDairHcWg1p3NF + ###S1J9zbVTPNPFXDm8FnqRUIkMbQg0Ia4FlSPNh7SenUUUyGW41u8f/5WiY7c7Xjh9 + ###tiRQc/I/OetOzYj/WtuobSzjv/728V8PKLyrwxqT4I51fXYAZDAZsePRGPZUHx52 + ###Wf2SDfwbrzL0J112eEY3sveWgV2XgV2XgV2XgV2XgV3/yQK7wvbxgee7ZM6aw9Rk + ###TUfHZ/XL9kG9dalkbNIe2vI2QYu7z/gprKwIR/QhsaM+Owd+F4CeCmwCj51QRSr6 + ###xAdI0T5vNpvEPuH9NUXoOl8v0UHDF3+CLhFRi8RWeC4R4EVkaQ8ZFHpgIfDcNXY5 + ###gs1HXDc/IE4TlkXcBxiwYPB0B0a2OMAgBwd0RAKKLHQM5Pobn/wwZK+Hvs9vCaEb + ###6Q3fH47Or2KnBQwYFDV47fe4RcHXO8pHw536Q2R1uPWgP/7KSlRXcw5JgGBkRguj + ###l+Ng7NOVXH5zu9efhbfQIGtOowbJyIlXAPCdkhElqsrvQRGb5ihUu3M0mkxnQ9iU + ###YEawVrN1xg5evYo4uMc3PkFmNGLhag8b5IQOIuhPrxw12acHNNn8a090oRfc864i + ###DfT9Afo54EE5DNvv9UBZ1noGlHU1DO4r/QA9OdA9fhBNNIY1RjuuIDZ5A4g8hbv+ + ###FJoiOSaesTHe38FzRY6cUBnGGnpHkN3yK2hfaDfq4YxEnsd0K2nc97jUMIiapAsA + ###tHdjoBG8WQCC2wEjCV+s4agsnl0iVqG/oCk+jH1+cqEgiuOJOzAI8SJ8raIjtunQ + ###UepUVilyCrwvsZ05ZRkrdkczQLwozNlM1D8DRUxGC1QmHLsXobc7m0gyjiZEwTef + ###GCkwkYU35IGqjy+Aw9Ob+OcRtY3OPl6nM5rgeuhjbrGowRjMGhJS348CYLOi0kxJ + ###G1PoC8LFSzAejlyOhZKgIWoku4iEMOcVzBOtggi2nN01bPMhuvTBm+6q3IDYLq1/ + ###OhHDCNt4f0Q25A9vPM5cBkR1o/E0GIiMRiyQneyWTRKF3qHXSYxefk8fOvSRZHy1 + + + +Valin, et al. 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Expires November 18, 2012 [Page 252] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###c4wYt6ePIh2BlXAM9dqHjvEceFEhw1lAH3sYmE5EXXHGfD9eGV9nTZSLFZSgt5LJ + ###JrexTI3Su6u6fhnf3b29i29mSq/LlxHLYEp2yBHpfPJoOYNBiDGBjhR8Tnzj8bHY + ###I5kAn5tlJcdGdAiUYuNbJTrH8mX2i7TCmdIr1Bbrb0pE3VHtrBD48OvQBzO9foMG + ###YBNgSO+xJ0SfaF7jo78Xzcr7bMUbyWvzsmEhD6olvwy/qtD5l9UHberc4msWfJ+h + ###JWMyGk2Zqv4a3qI7V5BINGJNjKClx1Pyd5VPZxeVytPRvTPpBUzXzJ5sBV8GWa9A + ###T3pA5GmrzNPq/cezc/Qq2j1qdVQnITFyyqLCoAfOSMjnmfTWRjU7ZIdaWH64k6ry + ###NG1l9VzaTnTQTd73ydnBZ/O2S0I/ieKMYTrgIA2fYtmntX7ZmMSVYXe0gp2Qb8r+ + ###gbcqvKjQxxvOhmRs0NSLSSEJcfzeURS1ikOl/nc0vZxCyWcqzBGmmSDpnLNg7BMe + ###5WIy3BkfaumiXpJtMeaFh94XgEaU6eOKMqEwdjhHDAj+xGm5YFmlIzFgC71qmiO6 + ###dOf4s6fJVpztxZ7hvhJULYgUxOciadU1zMcjYKm8qYNe/2GYTcTP5tDG6wxXKJkL + ###VdHvo5KXWLEdTQdAHCfxAx4mu/auKewoYBF6gomXqoa5fsCAMoFbSr5JksIwrn5m + ###oGaWnNZ5fZ19pEAhUwoY6Iy6ffbx0/F+STUQke950yonKNfpOssigXZXBnExY2CQ + ###BF6Z2mO+Dzxc3iXynucOq7LXhgiYkF880RU1iGF3uRePrYgkfGwT9lqmXvG5eCAG + ###9YLft/IEOAGUpuKRVWVF+Rnl941hZb74sFwDK7jD6IHwQzddG1X5wGzSrNeKZB/c + ###EhGSsymKEb4xYFFB9T1uttSk65h/DBqUlJT0jlA2eiCTIcWGSTCHFIkgzdhOTcki + ###tKCT0FdQirSR4jqi+GtJtNKdhMyh+krszILTKKjGI1lUcjQ3NZCjw5iEcthunWOa + ###mo+fzhjfsELY/EolYSQ0A8NrRQW4LQegSLUNKb4/FrSBp6WExWusVF5J2iQMRgSf + ###dqt8zd/i5oW8KI2bVkXDbXOckVbqUBEOjbJh0yQVLiTcNjXJNN+a433yLDpZoJXo + ###MYk/ZHIWGMzdpjjtJI+p2LEtIJXGlLlAIeKSUOiM4I6D+LfzFb40KHpBPLW04DdS + ###jX7D/8iX0SCkaRuAofQ4t9xD/Yh9YtIiJ25IFv9yqpEZDMrmXZHzPGWk67ljTNsE + ###lxzds4A8+24Q8Ax0FBtvEP3VFS3xMKeqSpGWRIxvLo21vsm4JkPDYqPsIiQXEAtM + ###M5RIQ6ERHOO1/0ZFISNXQtNoqWeVxp3rXEeMS49z69+yMOqHzqIJZFRNqQsWlA1Z + ###d1EEVSw9Wd9zWwljYSOlz1b6qBGPWNK+lFjFhDgmoxY6Egx0G7TYQNXEROpCQ9h1 + ###s8z2pCqsZX2VpMWVLg6+u86diwBirI/GT70wV5eHpXs+xPjtkYLHqjwbZkj+frr9 + ###Ly9qxP2LohnxSMWYUXUVIJmqboJ/XqOKKkX6tCKr1F8/q9SzeriwOxvKoEFcCKUc + ###iJLUyZjZN9aRKGZGeHnnTthQ2P/+ZjRwFeM1838ZDJhjJY2A1sd+HxPskDK8RESx + ###ajXKlWggOa2xLBdPXEkcFk44DHve8uc76NffSmb3i+pm5c2bN5WNS1jv1BmgykYe + ###U3RqqJ1WqdOq6PSTsU9T7dPEPm/CPpu8j9JlVe2yTl02w7WtqfOwXkc+/3p1U/n6 + ###jXVOWYonQCYsD9ErSnIcxogAnO5HGH7TdQKXjbe6VG8srQF5bqzWlAEr1hW8gkOK + ###yvFuMarEmZDSst6ovWF9n8tT6d8L5FFRM+V8owdT4uUq3ATBcorYqNxOTxTBM4NU + ###LK8nPbmx7B1Bd+Lgwzp0hxdqqtLLlFQTdMJ8H7HUE79pfod5VBDKykMxOvrUpHAw + ###CdSL6hB0dcH8So85FB7pcblpICOfua05oZasfnia8mJeFcs86hXhim9y8DNHQIgw + ###T3z1TniUDpYz8Xq9AXlAsqde9gzOxU/HNIM5Van4/qjemjHrKxnIdaZcur+3PAxa + ###U4mT9SyrY13rGCqK+NSkLtqOCJZRVZToG1iS7ADLMFJa8JwMwHcqHdO7yQRP0dzo + ###MtWC0Zkx7+ZMgZwI9dyntIArAxlrgV3B9PmIS014X4echacgEHTrNXFLiGeaMgjG + ###IsxDXsgmZogz9BFOhty21hVeJMNuJUHRk2VE9BJFAG2l6iRjMkuyXlJBHFzLMo2Q + ###hjQp3WQUMvQyag09oWfaVtFRjHq5sMumIGw/imTEhdj4HyE2PllkfKW+r6FlEukY + ###i+2f3o8imDC5JGwFQturrhhACVp/eh2GxQSJKCEju+UxMeFWeOSlZdbLIUuwAXpe + ###v19IFYVUUUgVT5YqXk5o4EbRiKRpXFlOHjwPg6p65HD7bq6AG0pHUnerzQTHCD4a + ###s4oo/hsStZGAojP0Mjk0MObK50jVKFNhHgEI4JQPNMuqo1TIwdd5ALAgp0nMO0+r + ###MUZ2BHj4wOu5lHnj3vN7IOhpbDaHV3VbSoARAbtqeebsF2qTFJkrdh76crGaJK2V + ###ZAugPS7WSAPOLXW9y/J6raqXlKSjGnOuzoctzyQ7zoFofyUpMO6+O48gmOEP+58m + ###HBp8U+YUDc1onzCkwZ68sHj5t+Ln96//irfzA7spC5d9zVn/Fau+rmn1X9dWa82i + ###/mtR/7Wo/1rUfy3qvxb1X4v6r0X91+fy31Hj+pg4wP0+JGmk3Qkrsr15ZT3jtsUO + ###h/B2iEqwr2S1SqCYM7jE8/UfS5TrMLK5YKPP9CXpPRLNHYpA9FDJEyhEZZoexNQX + ###7WXyW6rWL0MCi2kPp671NbvEljL9NP/05yxhZbiGy8VqXymxDtmzRzXOmJ4CXhxY + ###Abwl1tOn/4hArOSb/oPzEJbtSA14tVILxynNvk7z7J7q2BG2GbDwghDhMrMkF8UH + ###me0LIPeJAg74K2owHy4YbHj+76SVkVcEheAyRSPP9EpszWA29K0a/v71rfX14m2l + + + +Valin, et al. Expires November 18, 2012 [Page 253] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###dqm4SrCAP5DZ8Zd3bDr6w5DmMFRv4jjQ5JJfPdHm65Ss+7mt+rhN4MMqVlsWj/HT + ###anUrz5Ecuw9TsUfcoVgM2WKTKQenbHCWX+OUI5LtXpJyWCHpsBJox0tf3Wn63f2z + ###XN2v81zdryY0YFcXzka6wqary4x3qr1P1jqab3SF/mksdrEP066zgFGywp/N36ZA + ###UxiN3X6AgkIFZK3f16+k7IT/Y6srkzpe2pKiZg01fnWm8eO041sW5fjG1/DtUiYe + ###kSYal31hVb+RElr6o8r/aMNv8pf874iC6Fv6Rv+XZ0s/wmNqaMfUmP+Y6soxSdS2 + ###Pj+1FeeGVNcAteTEbQwHcEMamdWBRD4YOU8+AW9oiLz9k9HCWrb0beqoVgrPhYUS + ###GVXLyRjVSMOohgGjEgCG2uHcuJWCneFQecf5Ib+WjWd4LQt1b179b9/ze3b7ZO8Z + ###tL+Z+t/GWq2p6X9X19cL/W+h/y30v4X+t9D/FvrfQv9b6H+j71jyIvrOqE2NPp3O + ###MOmuHaWkEcpW4GyAnjmDx8ALVOWIzPhIHuyuj3R/wirzadL5ODjwu3uVLOXACsjn + ###B2wYyzBMlttzfd3c7LjdObRP62uaR7tROYBt87pe59TpPqTNq6lGjlg9VZbb7Hmm + ###H3r+kX/3M77DOaa/c+lV6FNx5PEEHlmWGvo61t+kGmEOzuQyqTityKtzLizKFgAI + ###9PEMyD6KVyIk/xNLIDxg3pJ4FhbFeY1HasIEeTxgkWx/AgIn/8Vu+L3oD9Y9Vsie + ###xq4RUsRXE1sxZgLP0Q6/hHlZS7m2Kch0Ws49MwRkwIHox25NdUf5eDn8mJ8ODMPU + ###B1JFzr4zG0zfYrZAI/jECLw8zRsEBrEb472R27dPUeexGo23O5tcW/DoheRAlLPp + ###z4BTVULfONiFHuIKetqM7XR7TA/hVKyHioSUKrpUwrVFoRIJ+1X8xUUbYG+Owh27 + ###PXabX7+2/i4akGLcZiUAnD60xBMDJgva6DOjI3Wi4znSizEavwbAHPGaJCy9OlzG + ###es0aBlu4senE6SIfGni9GTTlmghMBE2515HZ/kdgYYEs4v4c3+CYx5w5qfwmlRZC + ###yOsj8uJ4TO1P04dh7CBTTByR3j2KlQdmkOITlanE8VVTzg8vA5whJvRRwbNCbrZL + ###2nkmn7TeOfukwySPYZkldsB6JpdWg0g+rVcQ/4pYec5JOlKqffUSiaJOZGbhMsLI + ###Z7wxlhlzg/iJx2GMZEpcE1aHVkmXFnqiN9ETfYd5pGvlawTljhCewyNyNb9xBn1j + ###ztVoS24pIoYKdO5s/Pw7+zwC420+EMbPCjkKXJkOGxdz/Mfy4YQrxZkbLQX5zOvN + ###XEqoZdRXQCeX+Ngoq0GiLeigzWr+sqVx4h+i2QMvb2wkbobVyjOpj5eeeszsgyrr + ###+/lakt+KGD+iPDHV5HVay88wO9bYVMCSe3bDqe4j1wpEBlOEuCREd2eTCYjk0mEC + ###U8EuhkMJ+JFdgrvrxMJq8SXRYP8upIkJOduPFJTBEhNIAiZpFECntttGbkVJzpTj + ###wZYyIt0ay5UYdrejUKOEHQIXgSUcRz6L+/Snnj9zxbPiY9Imda8YmXfvURp73hb7 + ###DbzhlQkIWpm4eE41lV4mQSqWQjkHyLAGpp5fOU4FsCwuwyhgSz0f3nPvDl7vMO5Q + ###0FxUlkgMEfBLXZio73U9F43yOd+oTBrxwxCRl3Ovv/5qvYpS8v1GLFN5689uVUjQ + ###/987kzEwRc5sOpKMyQtaA9L1/7X1jWZD1f83arVmrdD/F/r/Qv9f6P8L/X+h/y/0 + ###/4X+P9FzuqUyKQGvHcpYGLjn7veZ63cfLedBV/YnczmlfI552KuSzzHvzA1mg6nw + ###w1u26pdPVn4vUWG2yhy6954zdbIT3OScHqEHD0clz/RfWFtZaniqU2YsvU0un1BW + ###y+4Z3LnZOeYzfMgBB6xfyb1z/XJi6pm45QF4Gk/PwmJZ0+EYfYuH40b8O7IxMXU9 + ###EGusBRuq5Fld623r31atkvE/60d85L0L+ucZRhZKeCYEimJHCBvFGCJEwRKH3muq + ###PLm9LZVTR6PeaDRmKk3mpBgoTok+cwD3wxp68LvmTofQxMJpiCIX0PJS8eOLhncG + ###gzEsKarZrPvwSVHzI+b86KGDXsOk4OQ5tAE1tWF1fQKeMquvgMfKqtrzK4hpDKIv + ###2BlU2Xb0PANR721qoFVyCsuF84Y18heMN5xz4XV54cu8/njC4hti8Y3ExQssixBf + ###2QCfIL6Jhsm3kDdimBUHy170VTJY5DLu40c1twEKMRENHTGoIRvvTGOF3mWkMReo + ###x6HF+anek3JRwPzOjgnyf4ImeDFXwHT5v7G62tjQ/P826quF/18h/xfyfyH/F/J/ + ###If8X8n8h/4ffvQumvYF39eZmJ1knMPd6dJ9AxvKkColoUNv9u9UhVz7ocuuOuVkW + ###BsEaAJzCql34wM7g3nkMWP6qgJHOX9zJSHMMFF3Q2YGJSJx9FAIOUi20VgHNo+68 + ###y/zHAdPU1+lBxVkMoKiABIhFFUdTooehN866LGzxxMCeP0CTdaRnMXCT9fVIzSIZ + ###Ds3KlgmOEE/ZS3oVXGtook3xLcyp1LBOJm4PDYvydKEaAeZS7J5P099YgcF5cl5n + ###yZzqCmO23yT1SNKsZt2E9xDzFsQDRxNvUsxoIKVfZcIPpmarr2/hL5GA7j1o0k8Q + ###5vS8gIZVq36p+jVRufAq+kzI7p2SPCoWhvIoS/ZHshwIc+G5sw+WTbXTRH7Aut6l + ###ntmloXdpZHZp6l2amV1W9S6rmV3W9C5rmV3W9S7rmV029C4bmV029S6bmV1+0rv8 + ###lH2UTJSXjhI/SO9S17vUM7s09C6NzC5NvUszs8uq3mU1s8ua3mXN0u6UdJHcyURN + ###188Is/dwGd0npntSCYDIVFBvLPLENBZ9YhrFE1M8MdoT0yiemOKJ+XM+MS9HlmuL + ###kOXaomS5VpDlgixrZLn2e5Hl+any/ER5fpo8P0menyLPT5Dnp8fzk+P5qbFGjF+M + ###Sm4uQCQ3F6SRmwWJLEikSiI3Cwr5H0AhX4x6LaLcXVS3W6h2C+qlUa/1gnr9ztTr + + + +Valin, et al. 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Expires November 18, 2012 [Page 278] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###9dKZ/Yrt2ZNS/X0cJVOsW1NgyRLYFEk8iBPgHhuziQxT8nOcNAvtZmIu/JXW7P4v + ###4uRkfPPJTbk6y78wijZwR07mx1nQkcDVhIFwPhMGdAvyukNUqGRRPrOQBF4C5pza + ###ZylDwh72di+8exRyijL894Pfs3l+npbUV7UkTdJ0eNAXPgvb0xEJMOJe99WzJcpU + ###oONfHx8/eaDcnwJPDE/evwvRZHNycNyW/BY9LobYiV1wNmnTw9lEONjtTZKDxw6I + ###6kWE9cHebTQYxP1k5+xojtbMwBf1C7yCKzT/ayDrxG1Q8+P2Ax6TO2jGjLvhfTL7 + ###1Qjb7oI08tDrTm7Z+wVOY6yz1o1x/UJMFRne97rdfmzSFtCTy9DwLQ1kZ3//3Pl/ + ###qNwxyR8hiJbPLAIx4/6n0WyY9z/NWqu6vP9Z3v8s73+W9z/L+5/l/c/y/meZ/+ep + ###+X8OU3sdijJ6hn6HnPN9IoPjxUcGZ8cEqyAWiwxWQfwOkcFZpSuwpv3suODU71xq + ###oAv4968VGaxoJng91I8HlBqYrIl2tO/t+LbfZVUHeYnGrLheMoSX+d9wNBlb5tCP + ###MBVubDoEjh2eHV3uvSXj3cejE2Yhh/exlf06wBLBER2i1Zrp8UYXmRdkMPAY4/kb + ###n4SFy/mmbTncCc8DxbRW5C20VjL78Ky3uGljDkanxwpfsWsEkYc8nnS8qwiFFpCv + ###DtNrg7lH4CTh6fE2/YixNlHhmf/MSj5yf379UX8yCu/jexmjI8GPridfvc5t3Llz + ###5ooR47/RAWCMFTEIEqYZUEQUh5HRIlI3H4a50H3ArkJiqmRuVupUd3/RfqXjqKwK + ###CjPqosVBCSoSjQ6pLvLxDjqhekl0P+qn1kq5z3DmhIF1ib3KTOQxuhV7DT1M8bNi + ###jI9Go/7XMOkN4pABWJKty+nYZc8vuyllNV3zd2Te8KYIVzpZfTYpJOtu0tsyJp3b + ###jGYAS98Zfc0AuzSbvCq6K7RrNAqHhv9bg6Z/xMPrksoJVlUcoL9FxkJmTv1ZUM3A + ###1wL6notMgtlkku4I5PTq9WTCIphjnWPwRqX0YCh7L+gYKxMM5ZkTdrTg+x1GVWrX + ###+yqYWID+4bYHYNKFLaWGB0bILiaH10ZtZOXQMuJaKcuN9rRsfTdjkJXT5ONbUE3C + ###k1MQuPHSeQ/1BxaYD/+3jtn6bbwy0/t1n2ca0ngZCzhKOrdTWURa1HLeFjWo4FmJ + ###H6ZlFetFsKhgULnIxZJFMt2FEq6pXJ+I4fePPtSC8Es0PrfxxvZ79Ig7T6k0ruQq + ###SP31B1/goMlEAyXvl+C56jLTWHdBVGICQlkiZE4sCEgO0XwA4gaWG8L4bYAAQKZv + ###fkAQyKHN2KoCI9qBVzsygqRYkEVJCEIUc+IrsSVayYTdjwcahq4e4sdRNAAQSmzI + ###QgjKJfldUIc/Hl2+DQ9+Ods5aSsEP7c8Jc93PNals4XMBJEh4c/bP+OmdvoIIlHO + ###HssCO1IYn4eOCiRf+W+efOXklOVfCZFXfECdXNTnFtJcRhlvXhpESxVzeQvPbof9 + ###Ll3IMVaeeo2oKQikAgHUZq5t9WUTVrChpYxQ2+tpGxRVxOyoUn1ZrdZZX4UR+Owh + ###qS5SyzOHTEhvC6n8O905byxmNPiZT1Dbndpsx/GXtlx6Lp3MGvtjwZn6TXOm7D5+ + ###wvwIZi0jYyzqEz15yXxbKz3b+hb55WVdfco4uMmY/xrJEHIzwwEU861spRoopzm2 + ###1H3Zj27oLjnjMRpMhtMxa7JiTkO8ovh7la3lP45ucneA3LmUdsYaQz0QVKLQGEUS + ###3r39I3eUvSGKuI89tMc7cy6IPKASgL9npslxJZRS80nNiA8t1tX7E6szdyEdoVoA + ###Zyy5lr1alrqA9VTfjXn0oceyziIVZ2uFStLn37EUT8b9L0pp76LJuPe4gAIwM+q/ + ###VGuBef/bqLVqy/vf5f3v8v53ef+7vP9d3v8u73//4+9/F3RQrXhow0mNlEzIwTgd + ###UIoixhtROT5uC9UkfgnvLG7arlvsFdXel2gxHryU6C9/WTNqy2OjD/QwvbSedZe5 + ###9lie6y7zUQz/6dhbT3N4f5aMlk4jLGaOBwLi8ZfnXreuTeYD8TIa38STFM7Pi74R + ###dvh9F4PQkRWLQZl8fxB53YDCIL6LHimECClfpb7vmBR87ZdiKy2u/s9YmmWkOtoM + ###jk2SUefkyVgcJ7e960lSGIsXJPvxl0jckiAmi7n6V7K+9TIzdU/GIHXjn6yozbSw + ###ODfl4CuYn/dRS9S/RVZ/RDsZ2MnQyG/B2Oz60/uBV8XPv/zk/fLpp3L1s7wVgNGx + ###aMCWfZ0hWJmw0Qgsv7HtlQpCUUIlrmNWqGBpqKtb9EFWqYAvjhSg6cR13dtlpT+2 + ###bfCObta11ESUikjNPYaI5SZ4xAjmMlotyxkb2bq+ad9+mXyiKaG9X1kwRAuiGh59 + ###VhAprQgwYKVCrX4e4qoN4seJWCpcKPWFPFuJuNkXsG4bObDnxr06H6O8vShuz/DF + ###UFX2jjHD7eJnyxOGZhy34hj7y9ov9nGbGkT+RY/b5Vn2fUC8jaNuOB4O78vFQNyP + ###kx7GgeN7+NoCPe2yj9tfnnHc/uLaJOKweJRVYp4elkbNCp63wl/xRx23vTIW1qBD + ###l0MY9oedqF9O1z3kDzIOXOZcUOjAts9L7plAJ/Cgy+abcgRW0Z5dROuX3cn0Pkx+ + ###H4f0Qsl7wfopey+MSWDWVZXdCC7PnSY4fmEslLPJvqNQr0fky4e10CFY/X30WEqf + ###CoeVveO/4YHJ5wfnYlpgjP9mHa5iDvZIHGhtbng6O5YoE8VAQ0zI4SdIqbqqCTew + ###DzQhh8I075ndbZBaL2U3KUoN3yFT1pANbZmDg1bJlzMeuZDxyCs6GZSaXv0bQhd/ + ###/Drde4YEttP9DW2NundMkRWSHVbcoNiLtS3fsbI1OhZqHKMCzQy4uFiJslK/8ZX6 + ###TV2pw16/76F1j5koo5sheu3BS/jdwd34m+wbekOVPGShVfp/tmCrALO6tXPE6MM8 + ###4VkjCyW/PZenfnOThJ4QVOB9tjR6DGD9xiXS9KuDZtSl0sfc2d+fb8yKMmBl9mgm + + + +Valin, et al. Expires November 18, 2012 [Page 279] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###0n+j/3cj/duKqnCouA/yce9ruHd4XAkCi/vxPbkSzSQWe2c9S6nxCwnWeByiKO1x + ###E7dGXizlBn2Bt3VGhkK1KVHLdX66dsS7eI5mZLMKWz/SFixdrOH1tdzdBjeAQ841 + ###ZZPY6KDP3ONZb1X5i/lvmTu8JIkVF3rVXbhiwXs+KLrnF733g0J7P2dZYAHzOEHe + ###278pHeS//c3UMAOuYfI6W6NUMDYtIqr2WYLhVlE0K6Jx/0n2fGG1/J+2fxa26b/j + ###Riy282ZvNOFgJjrP2k1/8q2z2J2zoimK2zojoWIw/7X8twD/H8xU5aie9jRHoBn5 + ###H6r1Rs3w/2n5jcbS/2fp/7P0/1n6/yz9f5b+P0v/n2X+B7fnTHpDlyGylAolIqDC + ###XxQTUOx6BANCzSJ7wJ54RKaR8rKEwWlpwLVeXrG4Z8yct4nKDY5W/ZD4NByD/RiD + ###W8k0L/3cAU7MC0cxhdxkPY/zTsFEqWV5myibID61sD28vYujjoHLnAyIBa/q3DlV + ###swv1nYnEIaD8DOIUrJm5GIuCaF/Y9QZfMhPelh0gHmFEIpx2v7Nql5EM0Uzmh7kg + ###FvVSx/NcGz8ZefOCKGJWygW3y8n0/gp2C8oYHLqn320XpcWUK8x5+Y5CkWOvJpNo + ###TEZl2N4vHj9VP2evvXLh6UoKQtHf8BcI35kUxPN2sRywsdFduZQFZ7W7ITjuKI3J + ###b46LU3wvTiYyWwTPmZBWS+Sd8uJZ8G0rvUW5Y6bqO++1JAT4xm06Sv1iPj9KxoB/ + ###K56zir1l/hZTdpvBU9yweF2NL2K58xRl69jEWf/uFTVLw1zToufWdYECmXa4rCsk + ###5oZUwaMA9lF+UQL9BEDDwU2FKswq4daGaY2vm1mGUeJaJRisKYjFkyW+qrZFyzTV + ###KbjPMtJZIKAlLRx+ue4/lMTDcjZE3GKXQuWws33Lm7NeqE4OyIp2AxrHwymoX6iC + ###Vd5451WROkRN2j+9mmB2Aq9fEOPGImZFiJfSLbaaLjTMWMxg1V70NiZnSKWd2YNr + ###xRr104wqwVuvmIPKlVlfz9oauk0xUaFSeQPeQmXuCIUPUCIP+me8kQbgrfwn2f9A + ###Hx7F3dBI6fFEE+As+1+r1dDtf0G1WvOX9r+l/W9p/1va/5b2v6X9b2n/W9r/3PY/ + ###USzwfM/z/Gr6tQ1f6+Tpv6PLMMy0FHlMwgE2wLKUffWix56RHDZbCCop4mq2IWeN + ###5dkq7HN9ESfT/oSHMWE2sGcEs2lSerYJYo1nXisKIuoCzOPCcoXjsQsLT8C6RtbL + ###cmG75xEZOylKAo4CAeF3tTUhoWDyYczNUgTEj6y9avH83ram2ba6LFsTMx4vPNNu + ###RqDHHAZuNYyXvVuKv8SD1cVl2mU5dvvJrZ1h937kh+dwIsOHAD5YDVjK6PN2TkVI + ###0JT/7lW9b/q7zTrRbHi+98kr8q7wXmUJskgyBEkIEeHM1CocnV5Qlik1qktrhoXx + ###gIdWkK++2VY888kINBx5IG2OnW7tA2aLGnivPWF4GhhmGo48YSk4lt6DqnWCyO4T + ###9PO5jJAo5hcNhKjfHwHQXsLSAiZ5tjHuUtdDHT9w+dSdTidI60D0Rrem0YOvupmP + ###K110cmxVv7JVq6SEo/AM07akdYNJXvlLequUSrCV7m7brCuumMeldNS06yrzxFQX + ###enXrOQjxZyCEMGAiJRBICeZBCkMmQ0yQixjWciZygrmQk9r+0jdECJRjsVJ4RKMF + ###Lha3igGPErjfO/4b9ihHpXfhnVpjy2xKknIJfyl7FT+gjsteraqNwEQEeKVSwl/X + ###qQMXz+ANgV1UoIsXL8QPr7cp/+SWdJHHDt6Y6QndMTHrrpgYgVTL2Alsg6Hg7cEe + ###JsNLXZKPJaYlXmiL0lzstXV76H436C4yoKtkgWcjX1tuzrHppLz2rsZxdAe7qgy6 + ###bwc+JygtY3XQlWz7H6sFwNNKPjcDWL79r1EN6g0z/1ezuaz/tLT/Le1/S/vf0v63 + ###tP8t7X9L+9+T6z8dDx+83d5kjDYg4KvTQTdCc1/pePfiYpUVPYIXX8IzPHIoM3Fa + ###uBYYDK+LxPgbFhkdY6z9WDcpwZRQWgee0Rv00QCp+CXCOLxM0/crL6U4+7WhayrY + ###/tSSU9+pvFQeiKLkFC+YuyhPusfrh/C8NrvClG46XEjppqJJL/BI3iMKLJjvDI5D + ###LC+sHecALaNidgImQ+86GvOyzT2qc5HlMolmnZRUOZV2h+GHnf15idX7ZxGrMNy9 + ###KlQ64MMQ5CJvh6d59/Zhn2sWjVcFCwQghn6OJ+2d8HyjpOUFd2Rb36U6P/4TSh7Y + ###ExAVKFjCek8krMeq9kMPoCLRbv/yF+9alLt71ohmrQJHnvzXVvJ5OMMP9t7KmgUh + ###gBNevr1AEWaDSp38fWW+RN9WGQR3mu3BkJVf2xtOkcJU9yFzHkZTmAR62TK4Dy92 + ###3h20w90DkFgOEHhLwdehxhZayDy3H8wa8w0ZeEmy2XsP82JjrT8ZErP/7byetmZM + ###KP2nT82JeNwNRG+fdIAOyZGWlVDvkjlEpDQ3LSx58zBhyAM2v23xRPJPm52/pWYZ + ###yy4nz3myq4z8qxV5ZqhMWZpi/mUEiJkpqUaD3a+TODmdcbvnSEk1kM7ao+hrfxh1 + ###vSvsaWteEOMO4jCn2Si5iAY38SxUCix2hvejcZwkcPLSBSSTZ6bj+EcIEOVFCBCA + ###XBSDFwriffQIAvjM2JpUDLvGvCk/4Xu9++m9stpDdh9Bua4WCiLMeW/3ovjd4yGG + ###xLOMfGQTAjk0GkwqQjEYjuJx4axzigiTKXMLUdvhQd8re70JZsgDdB3Rh2t0Lw6n + ###o1H6hfQWLAY6Sbmj7qb/yDgMZm5C31mqmUK/OFzzuVzNSmXiuRIeH5z8fPnWGQAg + ###u/tE9xfWO+tYYI+ViqJiolv2zpSbMEQDV9n4Hih3EYPkd8YNveSkfS6ai4+uhKhJ + ###HHd5uwGjUvojMMa+cFxiUM27aX8iHsrv9NzROUXhHO2XxQf1RfzqeI9wJjs+33A8 + ###BdzwmjFUR4SgdxAGb5ZWFnI03KC7/iiZoI922puKqClvBt1hsSt8/Mnzg1ZDKYgK + + + +Valin, et al. 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Expires November 18, 2012 [Page 283] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###9GfwHL1zOhzz+QlOj9e2k9POkX5LdPqt8vpUd+6wSl+XghdzNu1kbF0+kCLGbS14 + ###oHQq8qeCgm72jskbSDXFFZRo2dCFBkqJUQ73OYsB0DFHcto8e1MOqV8Bm8TsOAIu + ###WBsXHxcnAKapZwFGCsFOht4f8XjISjA9ApfHREcmdiUpD5jLwB27u88y7yirbqUe + ###0Te0kRXIuc34rToCSB+vcjZZCmH29hIGpq3vLXaqdodUbVl/5j6bPaa0rC1syxUZ + ###U5/g83df/phadpKZe8RkxRm0K6tvZbH01FGeE3elkNW86fbqw+GmV5MxSFjCqd9d + ###3pfiG/aq2Z4h1R/uGALQVPJ82+bwYyt7+8Wc1v4ZF4RsnobgVcjLjE+rqEsZJ4id + ###EfT42MNoRqN2tFaKUASKFFYy0N3LUDHSYJO0XGGS4RZMB8xkOh7kAcXtKMKq+MPU + ###e87XSQ3xm4u1spJE3swT6/azjZqFr9Wa8zkh2OmqVBOWuJEgXVu1Ss260Xra8eY7 + ###EhD4Mvhh7hHzZqmz3h1TRM/aHBpC1B3icI5k+6SSCXUeQnI3lOctLkXCv/U/K/+D + ###o8DucwtA5ud/8KvVepPyP/h+rdFqNv6r6jdqQWOZ/2GZ/2GZ/2GZ/2GZ/2GZ/2GZ + ###/2GZ/yEr/8PKq7lGBpESg4KEiOMxEScryhlvKHb/22tP6EYr8e7i0cTr8YqR/a+S + ###jcrWvDueMTeZRGPgOcQaye6XUEdKa4yl6XrAdSgEnVsgkBmhEVFYC2dXorTwq6TW + ###swU6PSuDq6rQGkBUtoVxyk9wyoFl8fJzB447g7HVJr1BofwE3ncYerfsZQ39bkc1 + ###9KomK1Ar/cD7RNe8n4sPradG6MfZs26z+XIftQXMWh+669YIaehDRs7Dp+QKyEsS + ###0HuUGQItoID0agHonpgcFj9mxe/3BiyA3w5Y72K+QGkG1B6Vut4LvBYS6ZQd777e + ###RlTL+ECWjBATX3a38O9rfIqfDDMEAweavegNPmHDihJPr81LTeiOeQLZm5885ia2 + ###K5zENEOVkNIextEI+MNwCownGXKB9mFIvydeJxrg/zpx30MDLRPWXnqXwKHGwFRU + ###9b4TJcBpWCJP5GAgjE/7E94PHwC7Gw76JFuBtHVzE2MQ3dVXNHZFfWQwk3Ec3SeK + ###Vu6Y5PHO7m44/HLdfyipaytmXfH5rH191k/oKeA9Bc/uqcZ7qj27pzrvqf7snhq8 + ###p4bek0xh2WRJZLv4Z33bs8MXnzDmb/QiG5d/Nk2rT+qVe7FRr+vmyuv3UtJor7Df + ###XILDzJlidM1cq9rPBSws2IFidNOe1Ezv8pYCM9dXrZHdNkdl0o7uosl0jGIAP/X1 + ###Lol1oMWtlPI6Zu1v71z6Td53mglUxDC340mWOCHECFeuADrnq2V4yQ6TphRWlHJ+ + ###aSf7j7L/YaZ43G10tfdc699M+189aDSM/K/1Vm1p/1va/5b2v6X9b2n/W9r/lva/ + ###pf0v2/5XKK1qXTbbCYlAnM3MfD7Vl5ubm60GOQ6sKmlj3x+DeH8ICxeelyJM/3+F + ###/znHhJAlVcsoWbpBs16Suv+xfHcVX17V06/20oSYaLA0vAzLxMHzbC9YhisGvt9j + ###72tOVmRgnERXoNaUIjiQR0PUE5D/AeufDnoTr9Mbd/oxz3DJq3aotb+ZlIgAppJi + ###eL5TclmS0GrI/FmSzKgAdKFnLi7d4T3NDx2Dvfxkqjvk2QHavjtHYzk1ZGXlVH2a + ###/Uxoa7OtYvbw85nS3DY0lmITa0sH55YRTXNEUoImsLkvf6WXWV2J8x2rj7WdYb9L + ###kXhrO4P4gZpQG/4NvZkJ92w2LxRLV06mKunLw96qMN/WN+TaYxTcwH1wG3fuKAYW + ###KbXX702+mi55JQEP81J5I/f2qvePf5hPX3uV9LEVSMPcraqZRggQVS72qN5Ln5V7 + ###u4lQsuQO6SpgqYe9ZnxQYVG9lbVh1GXyxtHgJv7JQxvFT17wvzW0CurjpG2fH0Sj + ###GUG1vt+IoBO/kRXOjaDHJIsKFAPXuY56fc2fM3uI13pgixsrQYoRwsZPZoCShh62 + ###OzD7diBwYEWzajCsakk8xZAZlUn1/cTHWmcRNnnBUGYE1Ks1bcPICVadS67vrWKu + ###iPocDadEbUXU3rHejpZcY/Yr+WvYfohGcMzQ1ZlGFJzTIEcRnEY+MpjNncZodATr + ###kSGWB6GSBe/OnQoxjYpmALFwg4p+1qcP79RkKUoMghnoLHY9i13QOxPRzpLYJCVZ + ###DsypnS+HLRossZrLEqt5LFFnh7qRsQAbnMUCqy4WiE6v2RxvQdxuZfa2VOGwt+FC + ###t+Ds7TerIWw6//Vrhe3wleupkVqsiNshVrym+1MqpxtwQQsnppz88srYku5Ki5Xr + ###il7J7jAzer5QNd917Cy5Lke8e648lyPTWUIYz4aQI+A65DaVhyoP9vfCcZyMWICQ + ###KcmJcWxhjnKjdsZxBCt7LggGFJKcWDzTYZs6tZ22BUBGyl5abSMlhSbF5ea0St8W + ###rt7KRYmYD4N+fw/dOaYDpgWVvYcYpjf4y8SLv8QD4GvMkNQdMiPZFCvF88huMp8p + ###HFfMBPZsvbrZzOWjym/ZGpTMgsHWg9X85foy6KYH++HZ6dHJpWNTB/V5N3UI75Rs + ###F4/n7OoCHge4qbFcusvjIEtTm7Whn7+pn7Wrf8im/jNsXNduTKMxaWH5DgRqFAe8 + ###IkU8ify5EWh5Xff97/+Al9G1MQZb9b6AkBROR0H49vwZ14Az7v+CWqtu+P83a/XW + ###8v5vef+3vP9b3v8t7/+W93/L+7/l/d/s+o+W6MLDA7z3I/YAXVcj7zqiUudB2bsF + ###VumhLYsb0bApesUGA14ewov6/VGUiCiBRKbkDB69KesUWGeZc1HmGxupN3DAhju3 + ###IigAc/hwRn3y9fcpsMmX8+gXqUt/low2u9oiddW2Na9Xp1TykPXKoxQ+eU2Z1cK4 + ###hXOFDLjCBtwhA6j8rJGP9ediRiBXWIAzJOCT7NWbdXeo+9479cG0OB+vdsn9KTP0 + ###Pej+znEbVxN+7KEvPsAvsL9/cdZa09cX1/X297AqrLlun/XMl/ynvBSQZXiel/yn + + + +Valin, et al. 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Expires November 18, 2012 [Page 288] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###xfmH3C+SF+ritFi3QIi5jdTMlOI00MUAocL6prnbN/iJaqqtGjRUNc4qg04l3TTs + ###80Wemfo+sfltIM3ClugjRJxWRl8bdQPewHHutwxeqJsr/E2hltXnEVukKNwyrg9T + ###0Y+vGeeTgTAzC3OFFJMC+zzhuLH7CjT1QV5NKn1lndF2X76mkkgR0FN4n4OXOPsS + ###auhmejWZ9lEvF+tLiMqBPG9SWUH00SrPB5fC+4S6JP769cJ9ybWVcsWGZkqSpjgp + ###Ctt9yT7qG5pKLFVVQdOCPm24itDl7tFlm662G3mkqf8VtyliqXxJIg0b/Iw+5HSq + ###xi2c0MCL9CH+CouNsAwJcm8pxxDfvrP6EpYaqfmoNyDNmn5blNWH0PyFBtRq2dqi + ###aLsxY271hsW6pRgm+9rUjtS8OZqWMsmaG7poIdngZvbaSrFAiOsCZw39RkYc10of + ###s0jz7OJgX3hc1Ko6WUqjgLzEqurGk5ZxKS1Og6ZykotdJA3YTeMibEMzCInf8QRL + ###ySEwTreqJDvVACUcP6RByFel56YuMYiLBzGn9CLCRBlzs09Rtn9wfLkTvjs6Ibxh + ###tm+/ZSCualgg6qZFwvzbkKzPtuJXDe1evCOOmE2DBaf7qFZXrUcqPwqTyXjaMX77 + ###uOttczd7Ic8J15n20fFfMfIcvX7alyWv+hLZCCZYdT/3X1a9V7yVbORw83E94Ce4 + ###+SilVPslxVrhepjRo86WzafmMpcJlX9S/29eSyREP9fOYhJB5ft/11uY7An9vxvV + ###VlANAvT/Dhqtpf/30v976f+99P9e+n8v/b+X/t//6f7fjhwRekU4kc3o/0CzHpaF + ###RvErHihl3cLDx0eexNPx7OgXGKqfxFa3x2fP6fb4LJ2BdGCfYuC2WmIXB5CPqSBC + ###GCeYsgLHTLQst2yUJJ5MR1geiopfa6XsMoCj6NdRcjDoZKRrelqiCgo5pTokGcG6 + ###GUG4W+4ZXf8ZZlKeZyZFuj2jcj7t3h9xeJ88D0GdIS74Y2/yNQtRRleEqL3yghG1 + ###J8GYa8kRQDhXe4M+7iXX/I53Ly6+68x0dbxmpVO+jMY38eQCKe5qlBSe2QorxEVl + ###GDnQ+EifotCteIOnk7qXER6Pcz9LK/G0oWsJTTJHjUoDZwQiIpvB32Yav9Isls/K + ###s0Bk1MMQxUwHmJXi6f+etKzlmSCy9iBYPmLm6zGirgQvri4MRLsZ1R4Mrx5CViqw + ###PAvEw35ExTZZzUL2Egry0bTbG3pXIK8/9LoFEyQUBBHLJQ7i/slVeTYt0kKz9iKN + ###+LP+FQQRFKROHDJG7sr1IFj8GAsrYupvakB7rPIm2bsfvAQtYv/yF6vjbS+l8sob + ###1mjL9fLe7sXsl6GR/fLO2RFCbp6l+svYiB37SM12J0CyR7zCpdqZ3onSqJ3XF9Yu + ###ndlX2iivr26c9MZx1+xP78tolNcfIPFosAtUfniwl4dp2cjuYsDpMwGcZnahNsrp + ###QoCc24VoZPfDN7/YtJwHYPINnSvYb8o9aRKNfLClVtNTXmTg9bE+AgifcdiPQOYU + ###pZP/G3OGvHihvTEag0Da7xPj2WY5Rf6upfxxE/N/b5u9fAnTp8YYXJh8Y/TOucoe + ###1WtFAwUuGW0DZHnEn7kt5r7X7fbJyEAnH3FEUVDRSL2DPGB9O0Oi9vi56wBOK8Wp + ###dIb5++GPmXRrN/46JHNLL2F18ryH2LsbANMW9ijM8gT/GwxlTdT+V7I0dVkVWVlZ + ###VqzO1fT6mkkY7oq/+doXh2sflY97lMRkSVwdowbrfcIoHGHbuvxDJ1RK7CUsmCyR + ###XFa2jsA00pbK2FXSkEOoDdTCCk9Dztk4HuGaSIpgNkjCOyxLN5pEz0VOIfJLSe4Z + ###k2nHE8caX4/j36eA7K/eAlbansy1OYmyxhQ5KQut6PkTlNu941BOvscEFV0sk4Ir + ###b1Ronj9JtTIs7dH7OMK8bpQU8xoIFoj0GZNUmR3TWo9hpHAUjzvGmTaST8/gIVqJ + ###b+Jnzw61P2+aQFezBcGFLCGpm8biGRrgqkNEzD86MW3Xyop5Jnz7U9twnmTEsaVr + ###JlXTHe7JaXhwcXF6YRXdGTCpLgkn8f0oQzbh0IDkwD/94x95MoQhYaQPVqn3bCFF + ###HB7bbnHjaNCb9KI+sCiedFGcBZh1FRYJQXiJ9wR4VtCxGSvcdXjvpZCAosYHyxFC + ###5ACAqt5EJ8yX6UMii7J7yvLEWEPngWoZS8cr4opZlZVPdAekzA6ykweZ495LYIvH + ###LL8sLNRwjNdP05GYX9nbwDnVNzzi7AnoobzUu9c0p6g4PzyGcISmK/fJK3kBgPpu + ###55fw8GLn3UF4fHDy8+Xb8F3bW/eOd8L2252zA/y2ylvhq4ft8K9v/2ZW/TUwyPYO + ###906gKZgPt1xW5Qy41whwaOhJUqNftrjVOG+68NYn5yy1Ke78ghMS6U7U/rQNY1Yf + ###1qgZZcWQ5UWkhTdwuOag/S2yxQ/y0EDjXQNrmwRUfCCk6gYlObmyhpGyAe+qe1L6 + ###7tJ3Vkpvyn4CgZ76Z6IXFreXe2ueHeUiBKNwl42kMu0lLNyVseeqWtFtPr/L7zCN + ###zBkYG6usrI61HpZWFfU70z5u/7TeG+s+YSrKbZR4V3E8kCvT60teEHdNwJ30un/0 + ###oRaEfrNkPF7LQmnBJXHN51+SbWvzNcnOdy4bT9ebzo/ZeK80gtNVlmdNb9bMUpKz + ###qNGmwUJch/hNQLxHcB2d16RDznOQpEoVZ026Ov/NlvgMgSND3igu9i0vurKESKcI + ###6VCBsEa7gAvFOn1sQyLUH5pmK8fLsPMoY65Gkq52QcF29YLtmsTTDAlNwcnByV54 + ###trP314PLsH30twPAEXx4f3Z2enF5sO+yS9m4eb3NZqePoVk1D8nqBJode5OpNJmt + ###r8JkenU9hlb6QNs00P+FjflT3vuq2CKOC8EItQ5Va0hWZ+z2/PhsL3zoDTI6PTw6 + ###AY5zdLn3lhp+PDoBxhAGYfswa4RsvWHDmY7chghVxuF0TB6kAh79iV+FKYYnu9RE + ###H94ptj9vHMcg+VrCDPowDnlj3VxsebUQReGbgJP2+93Di6eREEYFfUe6+WeSzPcn + + + +Valin, et al. 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Expires November 18, 2012 [Page 291] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###DR7q4xGIZz8aM+GsQEgVUvYO+v3eCPT3V3vRFBRnYVLuxsgyhKpdfemjnDmKkgTv + ###PbxxbzTqx0pqjyo+vu8NevfTexAahiNqFqEuOxVmkkFXtv9UfbnZ8H7CftmfWuMz + ###auD3VMiz63WmaEO4lpV0eyBaU+FPKvip7vcRns2MG/Crkc4wvgaFuhfj76Slc8NJ + ###emMDUvUgIeOEl9wPmZUhW36WjbGU6m54HmyABAb6bvsINbLwCCtbvX+HO1n59WRX + ###xBlz78FWs+WTC1Sj6jdq9SqJZfJ3z8PwYe7Qt9Fs1SisqQ5iQg0oFI94+XvaFCTM + ###zY3WBskINWjbbG2Qs5P8XWla89H1hWSNoFmr1pub5JQpf0+behubtWqzSczchx43 + ###6gFzKxO/eymL+eeuxU7RtdhR16JRbdY2AV24FkFtc6NRr7U20+nXQcBotjbJzc9v + ###bjY3apubCiIBBa1arUHHkg9SyWY9aNQUPAO+qq0qczxttTYbmzUg9BS3tUZ9s+Wz + ###ZBmNVr3qw0oJfDr0xm9SWfy3tP+PY6qZHY9Bzu59QZ2rO3wYhIdHF0++DZiR/7UB + ###q0v2f9h4IJYHmP+12Wou7f9L+//S/r+0/y/t/0v7/9L+v7T/Z/l/pQ8s0YVM/+5K + ###IaBkr7GsRJnyTkiLfHZ6nO0gtgbsouxlelKtXU2v+WPbDAGPcZA9EMcTow/V+Qbb + ###sEI/uU0Ox1EnKWdCwgoodONH5kCT2Y61oUoPyPmxteWsBe2VrrByxHnTct7CqaNt + ###b8t+laknCM6WGzVrsg11wCx/D1gbqJSiQ/OP6mBZCmCcO1gQ7CLcB07EavrgOlZ/ + ###0qpNMJcrMQHueiW/vtZRpT5a33ahxyqZIdzkYA43WCcqGk+8GzhyEqaLcUfB6fV1 + ###PCbdawQnjlE2A/9x/AF88MlbV52wSir+mfOTCwIkCTyDo74KhG6a05RBBxTqapm1 + ###TFLMvPCqj4fwr5ySYhZQR4NBTKcynsa5I7LJv5B75FP2AnuvqDiVBuznLatrRqrm + ###NAyEf/Kq3ueyBgb9ZNbIdnV4vIMdsl/LaYe+3aH/rA4Du8PgWR3W7A5rz+qwbndY + ###f1aHDbvDxrM6bNodNp/VYcvusPWsDjfsDjfcHT5jz5SULYsOlRV9F60W2UdZZN9a + ###+EZqLnon+Y1FbyW/vui95NcWvZn8YNG7yfcXvZ386qL3E6aZzNhQrpOK3c6gMFj2 + ###kmgyJa8PVJsT0DnJNgHCHx7e0XgM6qfjKEPpcH3d5ePc3rn0myWXY7WAmlfwUrv7 + ###pn27GsfR3VYxCcj/D5WAZgob+RIB/bizv18LSgoVEV2mR3GN+aArLPdpTM49mK8P + ###FtiD+YsbLNAH8+3BgsUNVtMHq9qD1RY3WF0bzN+0B6svbrCGPtiGPVhjcYM19cFa + ###9mDNxQ3W0gdr2oO1FjfYhj5Ywx5sY3GDbeqD1e3BNhc2mK9zEN/mIP7iOIivcxDf + ###5iC+/x9xBgbLM/B7nYG1xg88A2v1H3gG1mo/8AysBT/wDKz5P/AMrFV/4BkYbP7A + ###MzDY+IFnYND6gWdg0PyBZ2DQ+IFnYFDPPAMXMVgwSz/wF8dB/Nos/cBfHAfx67P0 + ###A39xHMRvzNIP/MVxEL85Sz/wF8dB/NYs/cBv/btIZN34Opr2J7roRf1HSRKPJyUs + ###Kq/GhvPy2wAiBnSjO9sFv59j/gWRF6CnNF0ApZkXmBMDyFFXXxGPxh2HlvYh+7qP + ###3fJRy7y4/Xa77EoDIcDE8AxckpxcC64ME/R8Ovn0uax1fYp/T9mCcnfxAhkk7AF6 + ###A61nmcbhaJDZc5EMEazr43jg6Ppken8F2Bhec+GWoScxM0AYi0LIC1mEF+AaqTS3 + ###xWq7bd0wDtpsqKOB9ci4BnUI8tYrsFFVKzpGCO3uXO69pWiZ8OgEhHIqNa83oWtK + ###VD2E/dy+5JQbPk1ggT5UqVIgMAaKAkx6TB487KFYG1btNL7vjL4Sgyl77cqbBDqm + ###D+lV6Rq0/CMeXpfUia1KFiMhwbsDeJGzoQBhF6AdwY5Cuh5+gf6o/hz541yPo/u4 + ###DZ0fDYx15iC6dKVthK43+HKB+zNF+sNtrx+XQJhXdal0MQWTve8NSozqaJZX0aRz + ###ixBoHBM5ZYzuThWTV5Q4fwROeb6xqjLIDP6wcwHcG/F6hHh9QfSgYZeMygQLv8tX + ###YFZh0ohPzOaY+CweEOlbljqnefWKFCNIIWzjKnNA96Vtr7Bjg0f+C0Q5ii+COjvu + ###KyD+8UfM26DAdtKmASgH7dncnikTqegP06fXfMG9NwZ1cOS8o6OPKJSc22DHdIdb + ###5A3n9SPYdyO+fUzMUcqem95ggA5w1vbSCEPbZowKlHX+XHjHyXPTi/tJbMzFOD6/ + ###8ZNR4w+zJoQOc+wMuubuc4P4ceJhfh4n35As4xmTWuZe+bfx/x6hn00YJ5OQhVQn + ###L2+/c/6Xqt+sG/7fDd8Plv7fS//vpf/30v976f+99P9e+n//G/p/D9ABnHTns4Nw + ###/+AQMYtO4EzucDzJzQH6ZFBArt7HETljRKGZZCAPZKAe8LnhODOD46vnIIBPE2ZI + ###BoN2+Ne3fzOGAP0JtZvokYXwomDO8tCwCNyvjOE5ejvZDYHUDy+03upqK3ocHh+c + ###/Hz5NnzXTls1mKrR8O4Ts+fjy7Pw3cE7+62SVwflwNHrqj3Pi513B2YPJXfv69Z0 + ###MgbJGcNLYcyAYM1YgtzuwvZl6Gd257154wWzOwhyO/DtDtqHjjmVOC7YI8c0zF6O + ###d37WVppXnNBVafgOC1954zWa3ts/kALUXo5O3L0EhkIeiE6qVUcvDBZ7R5UMSPNX + ###hsGS1UsKaT5i9sM2nIwmsVAeGa0dkuAl8MAadqtOv2E229v9a5u1VbFSy26FCQLE + ###avhab3u74f3AZXf1zVaPrlZBNmg1xIgArZ7X7Gg/RUhesxPJs/JG9auCdvwgByNp + ###s5rWW/stHIi4rrtHOxoNVl8G15z2kIH3hzcRSG239yDEPcQoECPfZExb6Q5krQ+u + ###3p7Y3eHxziUe6KfvL/Quqy+rjesV62RDIt07RaPxL2lTR6t9q5VvtwICN1sFZm6W + + + +Valin, et al. Expires November 18, 2012 [Page 292] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###oIr7kmy2xNx5CjTdNs1TVwBVUYqdZBLdYA1JkxV//pRByZ+3ivdbK9QvI9YZ/R5H + ###NyGlnZY9u1CzTr4izlGDWSMMrsLO1V2YxNG4c5vMHsZKjeM/Gf2wIcL7xAYbj4vP + ###5F8+D9LzekNM+MG8yJ7VI7tK+HfKm/Bva/+T2RUXaxrLtv81qq1W06z/47eW+Z+X + ###9r+l/W9p/1va/5b2v6X979/b/gdzf793aRn/0p/VpM5wmkAjPfNDZkoIV1po4Gjx + ###oGP91o07c6aKLmpePBliMunkNhrxNNFpokp2UV/UlPhqhc/e4/5Pf5/pWPb4+yfN + ###TrPmWTanz1tU4Ia5PqCewiEEJjnMcT2b21ssQQtfcjtiiSwzQCnQy9ke64EsY8L+ + ###JXpY907a5yG22X1/OE+3OxeB0u3bHbRIQi+aE1c+XIfhzoWY31Zmsg7xD/Sxs3H8 + ###ZXZDQhu6i/a6jwVbIxDON1yAgx7XBaU27s5uOgKAwxsQemxPORcs4/jhFoQ+ytW7 + ###tfKNa9HJ78yHb6vAFqLt82Fn3+FUOYcVfsa2cc10ZxC1cUimujpLcEGT/tcE5Afm + ###g3MVDe4YmD951cqGd/f2j8WU4RKg+BmwzAKlvnhQgieCEiwOlF8G45v29Op6/Anp + ###IzwJd+HUbadAoQMgPkZ5Mx7E45tenHhP+FcAlJPxDXkytu8nt+H5hgUQgsKyaHYZ + ###KF+9fvwl7qOYHUedW0q8OT8oLm7/9oxtrawuEBTaSSBKwyGGfqbA6emOi2sy6EcN + ###ysIMkIpg5ThjZVJQ2Ln4HJQUA6U3+BLmgUPulV9i1BgGzwGpCFaw/2PsFwvK2SBJ + ###rLCx0yvIK2j+imcIX1B5v+EUlbA8Wjmk7cMbarli6boUEwvdYszlLFA468fJpqzf + ###+xCBBonpsDvTSQUzCwPtVTCdsXDVlcLR3Owb1hOT0bpZOAx9PHzwnCPN7DhNjRsS + ###cwkHwy2l4z2OKzj4gGSADWLtEKaURnKe6f2tMaITf/fDbuaGxhCBEbm9gmCJDcve + ###6+pPPFkWjxJ5k/4wHW158K07RAPFLb/DsJYJEKesUptwPh3HpHLD2Y+vUZJ3tIRc + ###DYd3mSuUG5Uw+BBjivdka3ZTcuEu0I7k1vYkHqE7eCqi5L4DvOFcf81+ixduUJG1 + ###t+uz5N7nG0WbYwrwIm2pvEWxbuMOCG79gi2Ljg9NsdRKEp43CuBvrRv3J9E7Egkb + ###Usgj1Ozt8jANIKS59RYqbxKSwEnFSgJTBne+lLzrdQu3bfe6saOxc9tjeY4E2ofR + ###Pcj3VUrAU2QMFAkop7atFDhfYG35tIu8AOhGV3uCDT7pb2x4GYg9evyUKl/t8Ozg + ###Ijzb2fvrwSW/rOFXSjP7QrRQDRMqx5HZJ9EFq3gCbE9ylz85UUiYu3FBmJ04+hl4 + ###ZnI06PY6McdQeutYAMWgzx1hXMUTXsVdqA2cKrT8gnImPmBZafQCo+HxMJyOizZn + ###NoVLQGeBxsTZWZWOgm+wuWPMDAa1hOdBgXeAZItCT1o2hmIWfaFNCvY3D+nraHA9 + ###5OtSWAk+GOBxO3Yrwt9JCUYp6m2WFJVKIG97N7cOaWqhOpb3hQuLCBByVZ/Om0zl + ###5ro3xoJDonjBdwUlyAcloTi0+WFRY3WESOYwhm3N6CZT2p1/gXQh3gQFHmzNBOXD + ###sIe3eZ1J7wuWyuvGE5ICi4OkgiJNSSYoJ+3z2aAwPat9G41iUTwIcNMujpsiYb10 + ###ViEv+h2JxOTCtKGw5CC06g2nSf+rYnslGfsLQ8+coDjbJKM47tyGAvcoYrrMA9Qq + ###XaHnGkycbSK8cwxlvZGQqSdbpvYJhw/GFNKlLigddHnLmvJwPYrzRst0WroEVK6I + ###B4OboLgZ+e7FBS7ScZRM8KQuys/xnXbGEeZlvXCMdtDZLSkCC6nkAcRqEOpuJrcF + ###XsNgTPYqmluzqB6ZNRp4RsMk6aHyzXydEdUlHrq7+mwOuXN2FF4n4ds/tvI2ILRy + ###+TSX3v6xujhmTRswHx5lAz4ZpkKKfPR4xAk2CxrF21vS9rzgFAIFCX02KLx21HcF + ###BYtaoUaSAw6ypeE1ejzAoEC712SunA+mIqDA0Hd5NKtEYmeNfFeAeIuAMrgKEzRf + ###b+UfYTLHArnrJ9zgTf4iEXM0fD4ozMzF2dAMUyFrVZCTPOEIwwnOBEXa/Z8KTRFQ + ###+pMRRlDnAYOSF4MAFggUBg/aD8dfF36a9iPG97dmCIHDu0p0G0ddJcQlErc1BXBU + ###EBS85o7nAmUgr8fjggAVohXs7yOlDchZIGjQBemYU8oToClyBin1i69GSRYorJWs + ###L12CpqsLp5WzqHMXT8jQeZ9szeYr971+v8c0GEqrwDNn0IXIiPp6JijHIIeEo3jc + ###2co4mdkgfWjmEV7u4yiZjlmun+toHC/gUoaxOG66LyBp7Q2RGB5BPM67PElbgQo4 + ###mejW9kWt54D0lWQ/7kdf4+5+3Omhf9pW5nqSukTnQ5e9An/ZO7pfyhNAmSaxkqSk + ###i+pLYt/5kVCP+2yayIsEPV3TIs4J5moDIjQlrsggrUOmDbMEMfrWp1OdV918Hii8 + ###Sve8oPDXqHruTDiKgoIs/4DdKELHLirWyZbdQRYOiHw6KC7sIHNG75FBuhYqfgoB + ###VEhB0EG5vB3Hye2w32V5XyVzFj/PjY45sAIyAhkijocPWSxG3UGg5XqddLVQwsjb + ###w/MpCFOKxzzfzNXg8EiroLvvcEwjwsnVjfGGE/hLIXCKgEJ3Se/aH87D9nT8pfcF + ###7wzzjqxEtEIoiL/gywtZILIq8nvf6BooEpMsxZOtjAXqxmRGYdYLm9OVOR0pe704 + ###KOT/POz3Y7yXGnRAQI8AtFH0tT+MulsWKPEA0MLc3fE2g7/t4d2NN56igzv0gR7z + ###xqleBJSHaIwMU9kwTkmLtcLMRYC+Cd/H+C4cQjrnffoCwRm0t3sxS4MjrJCbOHM/ + ###wPtNIFQpei2EVmBVgWv1DzONMRoo3MwVMyMXLQvLRZWwUAbWWdxFn3hRIV4FZcaV + ###sjALhWR3600SdhusS1ppXmp8yOqGS0aDL+HuSs1FlO3LgZUioPC7IhOK2aCw4fnr + + + +Valin, et al. Expires November 18, 2012 [Page 293] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###NghOUBw30gyUhP+YJ8UpoOhOD4uU4ihzXgjcso+GWTRmJsxcrLsHFe1oAqclu46f + ###+UL75CLs7obnrVw+f84ge6Icy5Aw26SKk511j1zInssdTmeft6Jt3ojUjXFrZyKd + ###X+XNNhpP+0msDqY4KMtEi7iEr7jjNeMBiPIilw20+ruYxM0aYJ1f36WO3oo3T29Q + ###0Ml7ToqGkY4KuCx7AzIeJWfxmGl7xV9ht6LdrZl6LLeLkUL/B3Nj60zH6P2Yp8Za + ###dOuGZe82GgzifrJzdrQ1R3NhSCzwToe9cnKV0smZOEcT7xAYI4pbeCGN67nHT/fC + ###1r2EyxDALhH7K+ldEMVBRf3+Vy5FQL+jr+IAKtI/CBt5VyVOOubvHEvfg5mZYo2f + ###0ynsX/5SVHCApnMKDtj54lX63mAWJCoofNciKCC99YbdRYIyGLLrwL1sV1Hh85gg + ###Q+nEnSkIvOhGOyDRN+b0VWbOo1dfnTgTu4y4H7nZ4o31LpfGLuLudNCNyLyOHHvV + ###60aTqLhJYhc6PDzYy7EXR1iWA71a6faHn3EsECYuYq8tpNvhWcPoppsNyn48itHS + ###BqpACvvFXlmKpoickWkSewoo7K6zM44jOJFcF8HktuTJZK6ED77vsQPBUWdipcjR + ###GWKPzzn12cGa34372OUOizFzr5HsI/V8pYlzKyQaK5G7duKoT0h5ilcNibDHrut3 + ###XfCUgjbscgyGRji+oPtEl201DsJz3BPg0GDeURj3hPq+4pag2uvhbMFCsaJO7NwA + ###FQCFGD5FdgW2l0SBYCqpl8O2mGRa+6OEBqKrXn5HBM0X6h6UhlPlLi/6gzE76IDj + ###kHPyGww+KGAJLYBTBIXqBZAvaTYoXGwAMUkCg68O7wvKhIWCDQadkIVVzF5NpXGY + ###3PauJ1vFyEf45Nmus1nBbD/zWDaHe2jOBfHMdvL2dna4nnqjKZjR2fFe6jmtM6K9 + ###k5+fxHTgvTB+7FBUoIxyzAu9dCEZOyGPZub57vJnKgRI8nWATj/MrfBpPSAUPzsD + ###EecIccxbYr4UNFi6FMWSCf54T82cwExXc6SEQlSQF4AbXglNM3P5XEQ0zFNR19xB + ###vbrmivtgdmByAUlIhODOELWlcxAoJN5T/hXwQ9Pdz2aDgmudbf56lqhawAuGSc2W + ###9wuAVCy+s+ipAaCg69btH/lnqXTaip/kRlYIKwUccn6UR04Bh5wf5ZFTwCHnR3nk + ###FHDI+VEeOcgPh1m3vQooZ3v8RvOJ/wqK1dmntQTlPU+c01OqjOD9/UL5yuzLs3lu + ###z2aBkncNUeBC5EfdiBS4EFnUjYiwsaC5MDUs8ytDsohiLC86/WA5Fc63lCvBIlyS + ###mWWZCFRA2rItvwu0PT7B9Oi2POYNMu+lxTPvLIpfWcxvLs27LStwWbao27KV9NIp + ###dR7ghqIiRiV5HSOr5oDOpAV4G5K9fqLB7woVTmCfMNslmYGO9wodRcMk2RsUuMYw + ###yTOFLlUBvQQ+wyOukHRj3VD1qpAuIu77Z+ogGboHEz2FlwIaIfk2HKW3EAUQw0xf + ###+ZGMLjmQbJFMT3e9imENw343UY+vLkF53UP1AG1XwnhV9uqVq69oSe0D4ln2dIn1 + ###/Y9wMoY7x0c/n6hsAqfO7WQBD4+dW+3JMLWt5eIiw0lItXIYZMEXGi2YjjxW32Ty + ###Kv7Xkf8TZPqgP7x52flR+T+r9aDRMOr/1PDxMv/nMv/nMv/nMv/nMv/nMv/nMv/n + ###v1/+T5RO3u58OAgBCYdHP2P2T5mPE7b3de+GcnQKiSUr2ScaAEewvR+5BzeyCT/Y + ###ANEKxJigtOqVvuAtfgekcjxRWJ4vZCUoN2ETkHhKq6tMLMbbXWgx4T5RlLYJ2pBr + ###TcyFZ0VSZX0wiankObLl6NJsb3DcG9ha0xH3l0K+C53F0Tgdr6jWJOopKwP3/yij + ###Ft9B7z5Ftdg7/huqjXslBk7Ze4ENX/CWsmArXUHHnbjygK65KOdfDfvAEyMN11x6 + ###5mW7lYq2Ja/mexWCAfr01vUC6XwwXiH93ftj5Sdcu4onwYEfWpusxuiycMAPyP9P + ###aj5zh1iUDjCj/me91mqY+f8bQWsp/y/l/6X8v5T/l/L/Uv5fyv9L+V8+uweum1v0 + ###kyXdV9Ince/OPMu3LdYrglCpiBCOuVjx7wXJwol3se99ifpTOsXOg0beXSX3jHH6 + ###h6wpWfzK7mGPyC1KXLWMIuDDfOKfPCPlX86wutV6bSSujctZsz16BfM9d+arUsf9 + ###PE9UVnrPlD2sNtvh1W9xZ1Lkbjovjena6GN4/rGct7ZHIhaVVwDMn2rWsI7Q1vtp + ###eB5Uy3nDYpytGPaan4lAXsPRBKQqI7y2wLADGUibj+R30aMSTUt39iKxHlZ98+ac + ###bZrxMR/J7EbMw4uon7zqK/9VMJfmm2rboF6W8ToQhNCrOJnQlW4ZJYKr8HyDfOqT + ###8PdWxvXTx3CCqV43Mx7H4zEsW/OTspAfzqn43Qc40fDcy7rXutiHFxufPPvN9ns4 + ###iT443pVTmsT3I84L/E/F3t1wvBtkvbtW8GJrHPMARfo3zzvVud4hKGkdZjqbynf4 + ###wn38NMc4H8Oo+1t43pj1juq+wfM0zzUfTMP8KAuyON+xnEXWRsAg4z5FYZS9NXT/ + ###CEeTsWrSiRJQpCYlZWN7r7czlnh1y35P2Zlvtr2q9+KF+hN0FThfU9gXNqoFrWYL + ###31V/p/4UmxJxUGAfV72+4FzqDSy9Kh7DuaucQvJkqLxRc05rD5g7lTLcYcqufvI+ + ###nNtjfTgvib1czhhNyfWt/S4ymOdD0B6OmcqpJUOAIYfpnTmB0xsgVjGxfAKvhD0W + ###nAOamQKguv8zYFFoQIHieDgceaAhjhWGzgeHAwUowIN12oI/r5UO4Pv6urfKfQC4 + ###b4UPLXU2lEifE5EWIk563SmwcPvIUCQPhayhyxduhH9iQ67ZKObbRc6gx2bQgxmY + ###beFXYx42b+nB4b2tGjD9ZskrpRt4VQGXWpNdc0vrUXJF1tkodbzDHyr2iOnr3zQE + ###foyZgYR0VOlDwwUOBYUqGYdMPkjCfjQe9qKS5INlbdwcYhXetKNR/6uXALmO48p4 + + + +Valin, et al. 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Expires November 18, 2012 [Page 304] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###3G8eUaqbXZ54KQgGV07UZBGlZmHvXw8p0ze75dVb4HjETCEAJygL/5/vPVtn3d2i + ###zX108YCzgfbnZDGkzHIk7swUH4S3lWJ8Kwl8b+Yj5Rsd+gT/455YnLa+0oEV+Z2m + ###5fGNUYImFGicJZdQ/ec8m6QqAMfQLxg90w3gULjqceZh8OrIxVI7fbQD6mi/kD/D + ###8Sm/iOSxO4ljh3+UE+iPoF0zmZhaQz8h6WhfEKL4ywo0ycWWo0+lP6jYqUiBEVcU + ###zbRIEiGf8aWM4PmyyDLwiPk/w9YIC/e2+u3rR7gFzvD/bFQqnp3/c81bW9z/Lu5/ + ###F/e/i/vfxf3v4v53cf+7uP915f+MhfiRMKlkl1Zvb//wPSmlBXZ2dLH3feugeUGu + ###jcc7L1uvmlgdJ3oMyqp4XDSzefr1aon/5FmwfJHly6+K5yIvmcyJ5Yl2XtVTGbE8 + ###kVnO80QmLZmjbV0EvMpMXTJvXe25+Kll1ZJ51HzxjSfayKBZryp+ekIREe+ZnnFs + ###TTyT8fAy4FbmBRN9MJnfS/ZVwVxeqSgngwFHuu+ZGBSz9ivr4mdD/OSjec+fi5/i + ###73XxsxFB7tUEdmUGszXxU2Yrq4qZ+fKnwKSn5UmT2Fezr1mzzZ4lHj0gC/B5Vmvm + ###PH1BERXPmseaoAwxB5Ef0PNrgioiSokoQ/xcE6soc7DJbIN1MYe6pBhtnlXxTVWs + ###btWzcCPm7YvnMv+dp+ValJnrZNY9hbv1BBxGlBNRmzczXkGbJtR6Jgl5Ah3eWkOg + ###sm6iUm6G52KKAuWsVo3AkYn/1FTyg+VVWrehgMw3IWvUTQhkKsOGmHxtzVwMjUBj + ###yFZbtjYnhBJ9VRNGyRoaVaPfhdq80P/j+f/evn405+8c+n+jZvt/+w1v4f+90P8X + ###+v9C/1/o/wv9f6H/L/R/d/4/eZto+LwF4zFsf3J4aw8oRRNPqyHDIkXStUCluWmz + ###t6+j1C7xHFZvX2d7wcCgrdd+Iy2v3mks35yA9P0PH+bKN0d3kJTcJDGHoLwMPNLm + ###TBWULwPNIee9QtKHHOn8RGokdy6/hPxVcuT3PywbY8129flDKfOi10qw17EBmOfG + ###NSKhvMPCF2HmRW9Stq4eHGjuCFjYCVc8Z0w4vW0R9bReYykY7U+/IW5n9YLu2hQ2 + ###tzT/EqON3uop+UlwF5koM9HxcDhiIGiMjd3iSjv0QzzPkAGjo07zLf/6FuvOSzjw + ###z5UtKoAb83+Re5+nRAIq5pmSug5mQLuce8rcxvxZBE61HILGVTRPHnSLt9F6CqJl + ###vgVWVnieLQSI6si/YO9ZmecOeiFyCH2wi3zqa6e7jmNyxWiJFWAOx895545Z6uaZ + ###P3351TFwvIMYsEg7B0JsylIuBVp5Zb1JbPvU4l3qG8Psf1tsijzNYXZ288gZSB4Z + ###MrObuYel08w31v8poGAo0jZSzd4HmwKy9P96tRHL/7SI/17o/wv9f6H/L/T/hf6/ + ###0P8X+n+C/i+S9972uiC9wC8qfW1oqvFxqYZr9EEHnyVoaKPwHOVZGKOUFumBsjgc + ###ZSEmyG5P2iLb0nQczBehLPJ7V99/SDcknEVTZTm8ih3KJpyTmMzZZx/es6ojxTIc + ###DAhIieIb8LdIETwQCYQJoXh6iIkNQI7lOG31Ot2rAtNxqK8EzfLnIQxEt5Wagy+C + ###VEGQ/MhRPUoJCzDX9ZZe1HLAyvBu2ehAc0secPVyAOqlDz/sMBH4aIAfVaiv9DmI + ###EKqqDbrRkZe/o7rd0RctO7W00hia9gyTAfW5KrAyMLCC/8QSSzzri8OTyiMhmv1p + ###X0u6sMOfc/fFk6aXFaUZOpWdQL/yrM5WgU8enB+cikT6qKvCgzM4Gr2GlfhXbiMc + ###zVYxY5RdIichY+1WogDPaDma08vJuN0BGSFAYYpLETzmKsqcXbgJ+qOQ3d0EIDUB + ###J2j3+/dYoLh/jzsFBJowUCFCEZgVHp0YPfAQ1V8sNlceDqCzq377Oo3BQcMWNvxD + ###MDnnsAJQBBKhTWJyhzhRktpp3tiyc9MeDII+u2mHIPMBinl4m8HktLTuyR2A6Mc/ + ###FfDGYMrJyqi9Qru2k/8MMQlJ+n8w+Gb6f70ey/9W99e8hf6/0P8X+v9C/1/o/wv9 + ###f6H/L/R/p/4v9VDiypS/RloCfnHVr3OJzJqko8RleJYuLh8Mvpq47EyWpqnpMxft + ###m80mENfx4xq+rWWDrqTr4o6rZVJUleLOMWyK1YTRQV4jQQ4l2Bjf0Do3AY2apuhu + ###6FFDt7apf504F33IHHaD7H48ux+H2eBL4q7IUBzFLogpjn+0nSABbOFMdH3vYDCr + ###vpeIcWOMv5Cul0v/kyZSjCx4JCfwDP1vzY/pf7VK3V/ofwv9b6H/LfS/hf630P8W + ###+t//ef3vIQfV0jI7Q3kGeFi7fx9igXhRiOYBM0IxMgK42bs+Gw87eF9FUKsXPEQz + ###CCctnuibB65H8rcubxWWkusji/u69vURunKWHMrfQ/7lkLxFlKkxvLymecShXU1U + ###QL9Wtl4OXeNvU2uoPyDZ1mGItX5KTm2bCvfg0Xk1Dn6Zgi5xzwrQuPhIQ7vyfDlz + ###e7GshIt5FH9SdT6i8jNo0e+Yo5B+6Vx+pBR5G86EaMvH7WssbT2ajIXpABP4cbSh + ###//h6LBujmhe8PTtoGQnUbDfvqHOswEwbBv5ESmhRqWZfGCEqdrJYCTTD+ukwCoyw + ###t/tDE/R3YGR+6+DHi4wEi6b5IgXk7e14JuBMsHms9pzAe5VXTdufODaHx8Z0dS5g + ###qzjo74np6gMwXXVjmlO52Ce2+z7CrPKIlOQ+EECLLeX6RqUksb/h7eVoK+oEmDkR + ###qsZERQ5I3iGI8uPeZ8RgQcMm8QKT5Stc6V4WsU71msrW2zhz0Q1Xi1j8P1L+P0ys + ###+Fg5ALLrP9fs+m9ri/j/hf1nYf9Z2H8W9p+F/Wdh/1nYf9z5/1JLQC9FJaDd2bMo + ###JzpPEVhF7cBKub4KuitItNCNlt5NpmvzVco1IwFfWvK8ktZPXSYQFGnhnsu0cL6Z + ###6s2vxrOBGf3URWJC/p3vm7nRVAYylRBQS3OXkleMJ/LT8JOQ099VUkA4dRvpE2Xa + + + +Valin, et al. 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Expires November 18, 2012 [Page 308] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###BxVWLCaI9nnsqIkqIV4lzmnTWWGXefYN1f7MlmNSuf7c4kpeCPPYLGe0Vboh9OeC + ###EA7H7FsvbPP4q1zODWGeI/5rrHJ+CDNXmdo8/ipnQKhk27yXIqK0rb7WllvQJfxP + ###XukbKy5SKsApcnLJ7nr9PsZwEtwBlixmOz+ctdrdLi7OoKtdp0YZJLJq7Ypav8at + ###A4BXLDHuYKRq7kZpd5KQkUv/Me9M8ruShmmUhbOk28ooqIE7w5qXJuRr9I88qUjM + ###61DV71N3v9/xfq1L0Rfk3YrXFPTJi5R+f0uF13E7qfWbe3lyXfTwSx6W5NKGu6pR + ###i9Eq7azcK9So8RWCn8mXPvnWyoFP7P1pVu/WiuG9klgx+GxFfPwiZYTfcsIfv7nS + ###R8heO9SzcjlRyHYP4jN6OqZKMYP3hNPLMvdTzs9tRGH0B3EbMdVcKirnNiwr1IDN + ###yXDUDi4/kN8k0TNTfIcG+Lfee9qFcMR+ytnsx+qVe8/muG/Wu8+9bHkO9W/FhcqP + ###woNmWEvBm2jYf7vHzHcJHjGrcjazShyJPmUz3bvrQ1ppfa1Fj3yp3xy/e5cnjO/d + ###/BEmszAplVELQ3/1AFQi6JI4iktM/Bk3AVGDEsvhZq0l7soT4vfu8cJUHooQikLV + ###EVJi3Hte/enAS2cmvNz2Bq3kCGejjcKLcQd/Gfmez2ZvkKYAF0SZJy1vlKa5PRAq + ###B1CZZx1vlKasPT5QmZycN0rTzx66fmjmlfanIsNEipS5h+fZuR8FHazHJgKmZOkL + ###1hEZa+0ptT9nkyNv81By3M6HYxgsmxqp0WNQY36gsqmRGj0GNW7n3LgwYDY5UqPH + ###IMckqAx5h3LsZFKUauWmqT7mBPPsB34sX2uizd0IAuO9EfyiH5yDmJF8+Y/o1xfS + ###/1dvLn8VLr+azPHC7CvWXO8rNhD2ZQoUUQaWOFqz/eNEs+SdYaNWPoohN9H09mdE + ###r41aB24Tt7fZKHl725iVj3xHrNhfBrNOuqVwJBksGnx+K1MqxZMsWSGlUWokmTJU + ###ZRBdJOT8vfN/nhw3D1tvX7fuqHh52Oq3x8Ne+1nnq+X/rKzV6r6V/7PeaNQX+T8X + ###+T8X+T8X+T8X+T8X+T8X+T//gvk/UTL/fuftQQuQcHj0Uk/m+QS291Xv+tnNkyi3 + ###vHrHZUl6p56JuG5MOY8vllaXl86fsWOSXUrs5Bk7u2nfdofE9uCvw/YYhNMu1h58 + ###cj68RHaKbw6uYNf3sEjB62l7MOn9RxVEaY6CoHPDjptnS2ftMXAjYF8he0P15JqT + ###MXCW6RiYyltepl3/+gkQIUAGu+fg4AD53jMsQnAFByEoBOHkWUn0XVpq8oKmZ6qg + ###aYmNRs9Yo+aVG7VaiXnPn3uwBFQ8VUwNq3QCK7wd9YPPvck9Q+GNCckNrUBRvUq3 + ###WFewdcF4DYcRfvmu9boF9FTSq0fCv7Nhb0AVI4fCv0uUqZcQvN//kFHt0iz5YgLA + ###h2699uqlWNmXxKHlv1mHNpvsp1ScgTXUxuvCgTmgCiaF4FMwKGbWoXRUo/m44Yik + ###9PDXEv6GFTCc9Wb2ZT2Z2Bt8x+szbllF43i1E15vSCBCDiYN5dIOyBT+30MfH0rY + ###34bzi6hMC5UNKmABzRUixhZQDiuWoi+iHvysMT32gZVTgfBnBsLXgdBJm3p3XfBK + ###I300hRXVUcmOynWtRXwUqwrQK5Qi+8PhSC4IyHgF9pGheQ5+bMJalvmv6M1jZMfI + ###s3Qf0bXURuVHA5WPs6ZxlH58PJRmoPWjhda8NIbI8ePIIYzFEfRAenMhiK/Nt0IS + ###H03jGlGB1eN2br4gZgzzLZqII0J9ZE5hTkGM8A02qhxJIOvL0v8R+08wQA0XUNUF + ###/TF8kN0nn/3Hh391sv94XrW+1qj/V8WrVddqC/vPwv6zsP8s7D8L+8/C/rOw/yzs + ###P+odVmwURh52QNIKyHHdoNwbIHPkzGoUGWmAH4za9/1hu2taRExBpxDJg/zFuIX3 + ###xIFujghhtL1SShHKo9VTJkAaM+vzNFNE0MFBE5qMwvP24DqAbktpw2LVUDhQQ7RJ + ###tCdtGF5YpZKHdds++L9DxN/RoBt8LiXOVrWTBWzzzTZtWLEox7vn56XUYfvta0ZL + ###16aaqPgBn3cPK3fjI95VN9eweDDugQABn6XO9gIOI3S9Mg7Tdh+FAvwWSA3FljRb + ###T6/EPpaoj9OrqzCwKg9HGGhfhsP+dBK0YKJiGbpBf9JWf2/Ypjsgot7n9wy0m9bx + ###2V7r9BxOHfZhw4wzX8eSu93W6/WEhtwo1oTtdAS76YjvDaRB8atQrzFvp7ZUZq5X + ###1Ri0tKd805S3xTaj5u816pIDxzO+pnVjKa+zcB6xnIpxkM2V1hRFol+45ZaKMePy + ###REXlZx0jWmIsis6Wo/mUt/moFzjoiv6cRucf4UuHjqr1inHu7OlT/dEmazg1W32p + ###yCD4229WT778zl5ZV0ttlTjnavU6XfhO51TaR2VVqhkftjhiW2939lu9vf3DEltn + ###SUlbc/Tu6HkwdHaeQCw2RVzD6RImLrtqzSsth9PLK2KAWophjZcArvdO9+mA2z9C + ###UQFkpp8M/EFPDj6iVeQ1LRQRqbxEMMVfwqoo6CG10SZt+/2D44ud1sudo5PW6zcg + ###FcISvYLfY49XTAtY4nKkDSkWiDMvRG7mqgNOYJsHIzj48SqG46RESsndEI/V6yB8 + ###wV41d3niYa7BAKO/vGdVdtzcDb8q/k5axyA4HTdbrxFRudCjl2zOwFWVSedzhar3 + ###CZzjg4bDuVeHPWVrYsDpoIfy03rixgGNE0UvJFBJ96Fhsu5xk3UPsCT59eCyRW3h + ###6cqKQfn5FqaXZ2F6356we3kIOyfHQbNjFsfJAyH2Y1KTOjZHIZlY93bL23u7niCr + ###QgJhYRIKVqQTK/b1gN9whgb1RReM08Go3flY4LJIScoapXhPqYC7rbNxYIZjlLOB + ###yap3MF6vMwGp5pReiX4UcVZM4rS7ihNp76qQCGhvxePEye3fSFdoWm7toAJ+8Wb/ + ###IJYBP3ERUTxI6sW9iohgWkQh9eEWsBnCXHTDZ1VOASda7YMfL2ya1xh6Nu42t1j5 + + + +Valin, et al. 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Expires November 18, 2012 [Page 310] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###u4kAHuDaPUw/ga5nwlss0MXMryBSmsL9lhnfZRx1peT+W8enL/3k2coDnc+ZG6Ot + ###qVi70I4G7mOq2LCNWcdfsCsAi06cYFxSW5LOKTz+RGUx5SUj44SlFUaST8SqXORh + ###ozb1njKOXsmLFNdP5KAGx3Rzywj0n+MYcgErUgvEgJJR3D9HCpLs+ykrpGzRMh3c + ###HyzYjNtOo/PtrfRrqMSIM6OXzS3G8vTyZcmYXSWBkOkCKR8Ju2GqcJjygGR0oAhB + ###i7oQVCpe/Z+KQIj5/5Nj7bDfap6cP0ry3xz1n/zKmpX/t9qoNRb+/wv//4X//8L/ + ###f+H/v/D/X/j/L/z/Y/7/0ZPJFO1drSjprwwP2OPCDANhBrkHunNjJIAWJaCFBHA5 + ###UZN/Hi8nsFatqAndiTwn7hzBVrSA6W/M/120x9fBBB23W5ejMCVdLbVDwwumSsT7 + ###MFaAD4p53X8/lkSRWnKOOTltAc2fnsdcOK/G7U7rdWPD7S1NbpkX6MEelbxpQq8C + ###olXh4w5L0scSVmL61hRN9zrzZYly/F3snL88uGidg/rQ2j1rcpOA9VBPcmoN8F2U + ###Rc56oyttCU22rN7MVAVHaP29iwENsx+EfVwTpIqT81Z3N56KQU+opaensBVXhWOJ + ###KW00ih5onewmZGizO/f8OXp/tZuR3Cy7i3e7CWkKUBpCMUeSMLr6eBV2GzKQ+YJQ + ###SCswYqfd70x5rq4wCYl2Mg8TSmtdy1vs/GD/zR4Qz9EFEZFXab1qIiklwXrYI0mV + ###Q0qbHtaUQKTJc9ckmVQscGatEFWfdNqFc7vV/Kc7b4WDmDe3InzzrBQua5PYtkZ+ + ###o4J5U2zjw+xWFPtpsGJpic36zwLQ1bXLtUSuI98wrddr9uU29xaAt5yqXnsmpGxF + ###eBm8OS5IDJTcH31Q6ZdcvbmAc1ivv6TTtMX87m6CQfAJDgbKvQyyaTDAcbsl5BFX + ###4wDtjyCv3gY89W0CjePHLfFl3O86CYHSCSPWoIQsoWz2jtlQj9Be2g7RkcB2nixX + ###nuHt+5ppdTXsiMLmQiXSFxkf/jj2n7PjvWc3j28aSbH/NHzfrv/tV+rewv6zsP8s + ###7D8L+8/C/rOw/yzsP39B+88ADUAkOYLMgdYfXthbf+TK+iCb7b5Dy9HBYZKCUXn2 + ###/Llq/LZ1dnSx9z2vAdAE1eqihUaD116NN/a8WuN53IpSebZGiR1kM91aktb1zo9a + ###1/V6o+7q+nnd2bfWNfbDOz/eeQmKpz1Fbz1C2k7r4ntgHa3X605s1CuqKbCF/dbu + ###m8NW8+ifB46mnr8eb/tqp/mDM7mm2RvdTauv8Ra3dXTyllwzCD/fA6PggOLXVbfJ + ###zP93laGRo7vL4EPKbRlDTbzr49N3Uc9sPanrdQzeqMX61rrmGN8/B3WydbizR4FV + ###+r9Gve7quvKs4vEFbcQWVCs7hoR9DoLPRLMudgOndVGzMu4HHadlcT9wGBLRlLdh + ###jTnraKVZRot1LYyo7q73JuN+Kalr40vLFOqqT68ZM24DK8+FtL6KIk+z1iKT//rD + ###cOK0sB4Pw5BdYXL1mCXVRn/ruj8NWrxmyqMsRTdlKR6ILxe6ZsJXMLgGUTCOL/EC + ###xTh9CIEvaehf6OS/l/4/ng5an3h9l2fhzeOqxmtr9ST9v1av2Pkfq351Uf/5m/z7 + ###7+9WQbNcDW+WlkCx7A+vw9btcDB8Nvk8UQ9C0NUC/mipd8Xesyf/899PWBmOyifV + ###J+zDBupoA5H99WbInkzD9nXwgpnkxDaDz3CIjdqTm222yZ/Lv9D0u/2E9/C5N2He + ###0lVvaWnv1X7rbOfi+63/8Zbegppwei7+9JfQKL71P9WlpdOzN83W/sGr063/kc1X + ###iaS7we2Qv907fQW6zYHdQLj9ixmVu+x/tDHik7pAR38xG1Cap2THN75ZwluP6IOT + ###IZvEvqHX/70/HPwdb+U+ctWdml21e30GWnIAemynjcYP9Ur2QAEBoOXyTpSWDbps + ###GODV5yS470c4rBAO+eQ+s/9RiIpPjY5etACQBh+1tCZEd38v1EE9GE74nF7on1hL + ###yOlhy/j3ZEkhFAdFaktpt7SE1z1XvT5Zg0DCqvisUmWVGqvUWaXBKmusss4qz/FG + ###yPNAdl3qDsUdH848MJZoFfHJ0fk/2OWzS4BUx4ex3JR5y/yAzw9vt8zmu70JrEbQ + ###vuWQarhxjMi9RHsSSm1pkAqRtEGIzgR7cjt6hsaK7W1z1zJ/+6nnmlI47WAIytW0 + ###378X4kNXzcdsKpa6KwkDiVM01hZYm8b/6DuNlcdiGqmTgN7TJ8EH6A/bk9Y4mGz9 + ###zz+idX3yP+o5MKLgF/ak8sS9kDzvCdqrOjcBmhyvYI8NOkH6zMVX3SF8gotJn1sf + ###uzFBNNsdDoJcxM856/8d8s9B+v7spB+dT38E4g8fQP/WTP7sO0DsATT54+xDdtP+ + ###FMChH6KdVl+SpetxMFK3oCYr+I217z6yv/8aTm9Xtv6n9uXgZP/X0Rh1kCc7n4Ix + ###iBp0hqive+GTEnR+u3pyXmJP/vbky98dvWuIztE/b502wl/j/m/cWf1aonGK/E+/ + ###k/zv+zUf23nwV+O/WH0h/3/z9ae/hXvaN/H/9+qV2lrN1v/WFve/3+r+l9k3t16F + ###bm7Zj73RzbPT8TU7xLNcXKwat7nI79/x2zGsvvy/QXtQftUed9hbrBVDd4w/DOHd + ###2yH5qqwuL1Hm5Aff9WKk1sOve6EXdeOLfzz01hf7eMi167MEKGa//H0gIPL+F1O/ + ###PMYVMJ/Wg6+BaVoPvgimuNkH3wVjL9p1MP79CFfC2M3/+390Kfz3v7O574SxG+ta + ###mM11LYwduW6G2Vw3w9hb/HKYzXU5jH0Z98Nsrvth7Ma8ImZzXBGLXmK3xGzmW2K+ + ###co6LYjbbRTH2k3RXzHLfFWMvWdfFLPW6+EGO/pvhpNsew7ttvX3Qn5jO/8CdQF4x + ###n5FjsPlo5+zIfBBO2p2PrTawP+tjrlh12qE1EIpG5hM46m7ibVrAKj4Bc7TegJg1 + ###HY2G4wm/xU4PXhBYOzz68WC/dXYKhKQD2PscdFeBwyITQ7dLjj5U5axZRI2Ozwwc + + + +Valin, et al. Expires November 18, 2012 [Page 311] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###axfMQCGnwI3wDvcQaK22Xlla4p+xU5jNgQhV+FXE9WpXP7gWVO1reHUVoh9nrIWM + ###nTBa0EP0JeVXfU0+Fg/7h6Ec3bRHo7446x1vOzftwQBm73jVxfIQZOoNBmHS93Cq + ###doJWSi/8tqo1oTprsbdw1oxbl3A03vW6kxtHA0xdkPaeOiAgukkI+DSEwxyzPPeG + ###jgTah6G719any7Grs0u6oIU1BkFm4uhPuK/zSIbYWz5fu4kxgoyWuZxeXQXjjYje + ###yFIiCQ4OtYML7jHBuPlILYJjDcwGjpToN/eX415XaPYtQjY6YThm8KkNcgu6c39/ + ###1gpvJzc+tNMTyn9q96ndzQjzULyvfXAtqnuhKOlG2rsUMqP3/Iq49x9XB2lERNvn + ###8q4V3mFh0Q0VaINZGlC648E/QhwGXsj6waegX4wSMugbojcOJyY+CMN8N/FFfR9n + ###Hcv+BxH4opKyIxrHWALwEATY/sbSlw0Ky7rA0BcSRGVpiyvh6UeETsIpiLm9zjN2 + ###iLCAkNef3g7QIV7Igbe9brcPE4L1GY570ENYhFfjILwZ9rvP2MUN1jpEcdf8FIiE + ###6CPsEYkVMIcgN2hFsivvmjCDl+tcxDRDmtDe1OJ7Uq1JSw0fvl/HjA6R273ngUKI + ###uYPxvzD9k93N8varXd1936uZTV5hk3dGE5+/9GWTd9ikabV5brZpUqNDagO4T50P + ###ITzffGLAkokQj9K7qL4kd1Ay4XFNq5Y9rWp1rmkJVvBHXKiq/5AZ/YGXqraeOjHc + ###/BJYPGfKlKmVtj/nXMirLoPJXRAMuFkXeYGwv6bsSGOpFTrQ1asBkOREqP5dlX/n + ###BjgBXnRcXOXHEIG9d3B8UR4O+vfpvKQb6Avof4D/19YQAOBMcXlVFJ+AXhTCf1UY + ###j1boCyGekJejXYRbZM54DugmwNZ1MKH04gV8Iw8vGSgqg2ZBmGtCm917yiqKYqH+ + ###JDqtxkpIvGIF2dmmh+Vx5V9sm/nFqMwFDxKqqDQtMljpJYAlJNMWDlRgT21AomBP + ###VoAvkzqNfbYFuwMEvoL9QnRnzw7aSznYRJhClpFjRvZN6ak0+bpYXLEHXIkj8otj + ###hXqD3kTvCZe0pFPYIVXsiVaP/6XJ1HI5yWNtWcrsHGykYakCLMuJRisajMfG8pZi + ###+OQiQe+qUDgMv9siInz6FH8lGuS/eo3oV1/9ik2Lv/2mEAkvnz6N/vCLWsH3gjYd + ###jOUlQXPn7Oz4aG8Hte/W29OjMyxdnNVuB/TnU9Vtjg9AiiWFHPS049N3+wfHOz8V + ###Y7RGX+3u7Ld2zl8KGYlfGh4f7JwXcIbj5aJatmRSKirBbg/E4Qn3lVbR5GK3P+42 + ###MUGfZ8eEE6xUbSiC2ifxjRB9ZSmYOKt4XytxitNVT6yTIvG74vg82tWytUbyy8WC + ###+bEFkSxKT/2aGooAVvszEv3VN4f4/FA+0RbuCDa1gKGgplKC1ZMTwGNDC2fHldMX + ###jCxPJzvHMmJfkg3oYe1pf8LpJjI5KCdevftngz0BMeoLVj5fU49J+I6bdzVf0vTv + ###YJgWTyt3brnDbglsub4C9VqO0zQ/3mIeP8UdH2H4asJH6wnfdEFtGAddx3cpA43a + ###9/1hu4vE2boNzTn5zi9AyDh3egPjF/XEYTofgwk6JJ8F4w4a7K8D+ZHzA7SJ9PHy + ###/j4+iuf8AvT+o8EuyDWHB3v2F0kf7F/86E4HnfTB3u554gcW68NtarM+dDOGndMD + ###5vIfdws4sOwTmw5Q+aREx6V1dsMGg+++26KtdfpD9k4z+u9M+lr3CFSLDB9HL+Gz + ###46OTl4VKsbiR9R0Nht+ho8nxwY9HFz8VPPpQYVKYfKLaYyjGtz8Ch1bmHpD53wKK + ###6Y5GsIJC2L4S5VIBsf3ypHdLFyhFnSmYNqNoBDGsYRBi8pR8c3EatTIboEK3chgu + ###x9mBft5uxS1/nGKUPc49lmmSc7cxrHKyye7Oyf67o/2L71uHb46P8a/oA9NMmDKw + ###Zspzt9KseQxrMEVvTMOZYnurXkWjf6p5y3SjJl6I1TAhRsF/VsefuJjI4v8esuAz + ###4J31h8OP5fZN0O4q160V5pmNMR6XeNo41LUuUQQV5USdIuKm1QhcYFMaWSYY5pCI + ###2OYmkyY6wozLMufM8NDvDfz+8LrA3u6c0wUSfoIhXXuA6sPD1vf/xFIQqnYdLSCZ + ###kgzSFWv06nQfvv9p9/xIW+9cxLFkS0qnP5CULrQ93Cujdpdb9QrTAVIubEEUKdhy + ###tz1pc1m8Hwz4L4PgrgV/CIEcRTL4C1OVqBcOFUY2205o5UkRnBUKOOb7yoenlc/V + ###4tZWhVpKTRMB6G1ofwDk6AFXYoPLll+vR2ltxAum4GJlnIP6FkaSTba3In1OS0Qh + ###ekRxS7Qs+0Wgm7pe5AkJs9Dbgp5hj/S2t+A/5XLRLE2C8+mtiO5WSHPmz/S0rWLW + ###7Dc4Rz5X7RcepTH+XNNLaYihKxu9TTn53sqKc2wakyA33xgwqUnW68viRdnfcE11 + ###pbqiRtwU6E0a28i/HE+7kx9/3tx4U0j74iJNC6aIIOmDaJ+YO+M6GLQmww6ZHHCH + ###8r1BewiPEP6n2p6mciu3DpJvMO4NuzSW2T/0vSFu8KGBwiFlxWcFNQ7bZKCiGluE + ###aS83tcmLrlZWxMzEJuDsRfAXCms9PTn+yewRgMFdoKZTtnjNyQ7IFe/w7+LmZkRk + ###+NlvuHtoYNg8m5tVHeWx4UnuiA+PiOLpjBMheHWwf/TmVXQYislRCS5WMejJyOms + ###Jlf5vF6xAaevN1lsQnw+1mTg0Puem9X4AfSr3X8j1n8yQptvzvAmfP9A4LSWA6dL + ###2ltJaVtb2IBvYkHYRFhfouBm/fo2Cge87P0yxTMBL2gLds40edeCcXFYR9mKoXvB + ###a1ija64zTC+zbPXybuu1v16Kd/pqh4qcX/U6PVAfQva++iF/pzsJne6cW536H5KC + ###CuWlW/Sy6Qp8hG6pgpCIirF7jHdqBkEuD6eTktnpKUF6yv2dk5CaOn06vl0L1eS9 + ###ibjHgiwcHHyCMzrqlKyoE6DuQGXgQymPvF/QLeYVOzpiF+c7J030vdlnBZAyQ+bD + + + +Valin, et al. Expires November 18, 2012 [Page 312] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###1uDZ6kMNH0VHoObH2NXmJ8BC7GFv8Amv6KynO4DgEtsFahAn8w4eCLL2LLUpFmj5 + ###8fkyK3jPVgt6RWEP9sh6USo4O/zUcHzt5fh61zH2bu6xdx1j784wtp/wtZ/xtVzR + ###k+AaF4qmKwuzkJwNKs6EfO7uhmiT4Ym9loyccBWeEw5lgVgSOLxloXzoJfzpsQ8v + ###2GvPN5KD4dJSkvn37OMypzU9dzzSA2Z5FOnaCc/Lgh5Uo6YsVN1EfJXpo2WihhVC + ###resDjz5QbT3e1o+3xTl02nD8XrY7H9Fz73WF46YNjNVKlAd96dOAASJ6RqFCOrkI + ###2YIY782o1ZlOhldXhRivJTarbWnervX9f0pGK2Ic2sZY5t4BlgAf2dgNA7zY19oz + ###TjqsiqvGNwDsaL4k+pcdUICel9iY81f84XOsGTntFciY+c8soMBWY8nZUO1bZtVn + ###Xs2rP4f34tLzuUrWxkc18gK2sMafUYgvf68lDb4i2ldQnZW59415iIGx4NvTp/Kv + ###TVb11xqkydFRS9tnyzE+XjtiZsyyluHPblV59twvMQJKdC+6BQK8xMKRMIf3mIER + ###pHOk3g1BeFilCV6LV9AIG2IFpTJ0iRM/7PwbCxaw8b/96CuxyHzbEOAb2mMvKoci + ###VduyWGhZmG9XUUbUgQCnzCHAzHyHHQIAh+fjEp2oCo2y7ILoW1YJ3tGBi2oMv+MN + ###/ZL5TFKixBoMa+PWxxVgvq/oaCc2T2sEDicF/8f93ZRTCxeX2n2q/lBiQoARIofc + ###hbQ9aRsqC01RaMeF6JGd9NMxwIrnHmLFp0HwtWuYL8IBz+qUC3lfFW41xAMgJ4b5 + ###xWSZwl5z1e4GaUzTxR7hwbVn/umXtNMIuvoUjPvtkabZ0U2XzUTj4971Bt3hnZu9 + ###6hYM+pXuc+jKcVXeHVx78Oi1Vz89OShfC/3t2tee+arkjDQACFgjJVwtg3YcoCfR + ###hv0cJ15id+r5Hdqa3hxfeA3gp2jaKvDpvO8BPjsfMNBB+zPKnImWlub351W/8Gpn + ###jz4uqG4Kd6Vr307AKiYDeLr2gNV59agvBBS6O/iR3Inh++93jg+hZ12wATmhp0yz + ###eNYnvlzxPhRjfZtTvOalWqNWeH7r3W/FnpQtdBqvubEi/mxF++hLtIawgBF9zbCG + ###3x5P/u+CKNj1upvvsnED3aGrlsIszgT8wXIwHoM2EhljpOuHMZbwMvzKzgFfxzfg + ###Ia4Bv2qGUoGoSNOkB5HNWbt4V3aGkzfHx5FhgozaBQOxRVox8m0v5HIpQEiwny3q + ###e0Ygd46PT/dahztHx6lw8uvtuO8K+j3ol24lwzdFgWfAoACQdCXcF9Q6nP5gTIJG + ###xQTKMJraYIS4GIwIeDjRrfga+Rt3XZOh/LVgkbX7XMMrJ7Scti7JO4I2B9D+d1G7 + ###YvTrlrhLqfELX75A8cu2rS11wVTULyMalWXRQdQl5r6mZ8u6ZwL2rkyGKUPIFOig + ###VBgjmbNaXo+PK0fQv3INJG1nscgH4T2ukU5rACvzyXhke0bF1yQuTYw6t7GlimX1 + ###Try2sddThGDkgpaLbTbMQph7LMhnhp/kwLmdwXqGK9hWJfpzoDnmBB1ytDG+JABa + ###E8o2Hz0djQGT/b7eEezI8YTubSM7Mx+vizGqg8590nM+SfMtTQF2Mc4yevN253z/ + ###YO+4EKG7xADdeClb1KZ0SZefY95v9By6w26j7nRneAnOpDWm6zMdlsjsAGI7sKpf + ###6AbUi1rwa+MgjIdsBL9Me5/wQlmLGkgLfeE0E7XX3VGBJsyOOtNxLL7FhaLJ7agl + ###VkwavfjB0LzY2ftBPDFJDjBw9OropOCBgl+yyVG7QY5CCDScAbcC3rissbfv5AU0 + ###Hs5+yjsv+d2SljEz8Xvm15Pfxb6rCo5oCZ4oHZyeH0j0ZHndfVGzNvG0KW5xH9jx + ###N3WXkyeN4euRU4BaSgztimhDz2qS6Kfg2iAJ3ipJpz6yZv2Qd1NwtNsiDwnzcHSu + ###axXdom1YNoGaov6W1+UsoWkher5ZJwOa1aP24Wa1UnF3j4J3sWhRFOdrHeEtIR0n + ###zNtA/lr6FEQ3arqLhboCNT6NwNr2KmmfqyvMhM8B/Ppsw8sL7i115yw+KWmrllLc + ###xPITwZKi/2CJF7jshflBRseWQ2mkF6ZucM9mF99prmGOde1cjrXDGfe2eCCZM9+q + ###OpWssJpGS8XVwrr+J3PsAx1dxs5Sgy0zsxf1TezEMAH+oo4VscG03WFLptFVzAEe + ###mO0+3p75lfJtyFRUBy7+qkD5arS03aDTC/W6QtGRK3aEPq8yit+FuPxdRvq0eKDh + ###zCZ4IHcNRL1070DRszr+0evCX4s4XZ6uXr1pHu05u6o4OtId1LBOrvNDq+Fy1V/b + ###3l539JbF5VH9ds9SRmXq/FxvUFu3kGn66H0X6UbIDk13bOWXFF2kJXtxu0KElW+L + ###1Fje/POfIvRe1vgB8hneUiTOqnCmk3Sk3WdJ2E1jL7JvEHu6heLTymfvsGgxVjeo + ###1bLj+UZkmVZwTYJyN4BzrxuQi81gWJ4RPgWLXlwoHlel4po2DNjNd4RjZxjWCisU + ###1HovR78V3OFeZXc3xeL2tlczyjWpHWOjUJ9aArTlLXQLMsreG1nU3F+txL9yr2FB + ###4yzbsX6KcL74cI5EnkeOamvZ0QjR11LpMyu8v8JTMwz6Afl9Mk4r6M6HSWC07UxX + ###tNzJgbiO9Gh4qHz3q35ipIgAXxyWC8P9VvO/lT1nb1ecuwruMzdCtCfNLfmrRVza + ###3rW3bvaskonK/CwuzziIQeJGRaZvbTn8wb4FbCYfkkZk89JEi4mkzV3iv9OOdrXU + ###GMySlg4C95FO7+irJY8A+4yItlI0LHxvx2XiBx9AVjRb83DMpNZe1FrndtqXiRwu + ###gqUcNVecTKPa71VEu4Nnq0VPcANkMehs7mbsL9XddiXhc8XmHBvY4GxbzOBpJmwv + ###YjSkTfjdTTBgGIMSlceT2azGATq8D4bT6xvGI2IweX9YogRj5OIeR1FCgIsglowI + ###m21W8Pz1slo3WJ+afUyn7wo5IbL/Ib+JMiBg8IxeAhAj4DBwQ0a0YNlQnBMNgKkd + + + +Valin, et al. Expires November 18, 2012 [Page 313] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###+kEbM0kPMTnzXTFrrtg9zDKSp7aZpX6lQK+fGhbP0b5y8eQN66g5/RSMyZEHp9a5 + ###GYYU+N2lqqiUIjucYjouzNMm5j8GOgJ4KW8X5hEj0do6eaiH72yax/lq4vimFl5R + ###zHHiLGWIDp6kGiPTB7zx4+Q0Gb4CsQuOBg3folEy7OaW/s69pX/VSIuHinAhAjse + ###DHnZWZ574/KeXM54yhEWDnm+PKKpDvDQ7pC1WXg7HKL+M7wb3PY+azTlmo7uD54g + ###hfgbiUTj6K1iUEucq3FPoSgKuDAL/uIskYlLw6ibrXmWwTafmNZpLczAsj+nQK9J + ###r6TT619GW9as9Ik+dSTGSE4hcxNAD9rOARbDq+mS9jsONE8708RCrbe3XJvGMbqD + ###FVjJcfR/kdXcs+qnuooJmzjdqiSXXDVNIYrKVKIca6USFspaJ4vGjQ4TiXZ+qrS1 + ###VGf6rO709vZ+w2yUFERMbTWKkvcsns2bd6aT4S1dgRbGhs5YjKIFNDXBxYPjG0iY + ###HXk0lvgj2vqUmWRXdt50LZKjxHhyipcSW07OlhKhQOssIa3KhuG/lDtyMPGmxte8 + ###X7Wn0J99m5NNRQkcAFew+zM6nVMtiUhIWy3Dlv+bqdZpAcEmB0gCDr0gC7X6SlJc + ###cXG1bm5MDN3dparGmK+JqbAAPIf+P499vFwNraHd5ks3aOUtcjm1qw27LBjagRxT + ###BhJQmUxgkfUiuY2BhmRytA0h6V25OGMqmBlZq/IDmZEuyrUEFJgdlT2Pto/WsUGO + ###XAzGMgS37YlpkNJ989bN0DgDGc6NTDFzKfmTeh+cRvlEPS0luVTvQzl1oJhdKkIX + ###iF5WkXe8gZEfl7Q0ZubRp2uZzlH95UKOOK/iB7PbaLgH9rviWT2rHU7HQZY8ITdy + ###RD7bGjxF58oZqm0S3tw2DZd2m9TDl9i0dOZkqLtZZeO/yEjEclnNbTs5KnBjKeE2 + ###ys4XKPbh2RjjjyYYe3KvawMoJL7bXT3cZdPBpNenM4N0AVAhQNu8aYeM12rQBTw6 + ###n3mu5Xe7XG8jXXw6HgQ8wbQM6WbHZ1gdBJDHhldXZul6nQaytaDvzBOnN3i3i7+8 + ###4xmb34rxjs9kTxq12Ge1CgNcSrnVS/rIKeZFKxZLMmComHr/sZaWqmmlM/guZtRM + ###6tROTSrlugtMdT2SdDANeQJs4FXAe2X+sgn6DbWvAjyzVwE6xjO15daz1ZXcJvMw + ###a4nDsKuDS1eN5u1o4mLZYqqiaPSb4nO5a/MCNpc9eAzEfUVGgwHIGyHXcjHHN6VN + ###jwx0ATu5hz2L2dUR7uEVPevpwZbW7A9DDLghX9UcxGYGni7lpDbjqw3H8OQfOxet + ###z0Tn1qB+vkE13p93WDvc2Bx4Pd+4Gn/MO270SbRRjq7s+2dMvB+ERG0kxU7Q2rxO + ###wmtJsENkhlHqP9ohGt1Y/W0aDgzbrI4eBBy7L2iyRd2baFWhYpmtF3PbrFDyxlw4 + ###1AZL+mD9OZGNmt0G3d70FhHD7aSAnoAc7HqgZWHCkHxqXWxNtrYegRgiGlQTaevA + ###3/SueU0BWAUFOMqH2z7ZNIRtS5uCbsuQpgzhLpOttObZXhajk65yhhcm95ZDMoiO + ###b+FUyCE2nl62+VFXot80Bol/Rl7T+NdkSIWT1OfIEc8DbruGKY/ZeGR2TY6XIzTR + ###4riA5qUoQ4dA3hZz4cyvA6FWgUijNBZWZyhoG8S+qvosVyPtl5wECxIfpWjgZau/ + ###kunJql2DkII91qbJHcufjkdaI4nFVLu0aJd1kGpNMzwF9C3qyA4U86Vypi8ySM9o + ###GktK5HQA0MAVBKKn0tNMrhG8uFW09va1QGxcz7gxslpb9vBUIM3MK2I36EqecbnJ + ###s1e0tOQz2dZk8+IluuklwYHspCLZhODjJUaMvB1+JODaks2LZNp9unQhgjesF9wr + ###jps1gbv0trYi8vccl64O6ki+gBWTNuMphJs5uSWOOrcrvWXD7LGsuF2xFHG+iBVB + ###+9iOsx7EnCgEHJv2DXdahjSjlZyBsXs7bdq86aCJoWMgQafzgPNlKQMo0C04UJxN + ###Jfm4OUHITBiXTAOSbaVzCINppXMInWltZNy/uI6UVO9DleFXSOem83iclalT/WY4 + ###DAOeo709Go2HI9DiJgGXWCjb8igIOjdytOUTrKSyHAlcq7R5LamLyum2Q17Zh6rn + ###UtqBXhd7Doe3+DKc3o4mumOfU8xRN5+4k6055RS0k1KNOcfjDRyDbW7NPpp9jQ7o + ###pvqGV4Unf+sy+f//Gjwp2Y6MJRenLqkBShZ0Kv7ciOeQyp25YWJjgUSbLOiyssxi + ###RrsPDTHybx5OIg58ut9w7U/guHpMQkHEc5RYIe4GvqLFYxmRUnpEczEWJhzvyAyz + ###0s8wMTy3RkbO6KK0QiGeCrAc792EbaX3YWMph5yuQDCCTB4jxZ5+7tudFwry+omH + ###Cci/ikhdSACHnz+/r3x4Fu7dDp7ZSQA9Xp4jX5LA5qvjnXe7heSGutO1CWY55aNY + ###sgMdJ81XsA/3Tg8O/RJo4zz9gdxpneHgUzCecOECsMlCSnMCosX38Pg/KrGQypAh + ###5gFNfViAgpnCIQXAdW3c2T1vf9VWTiRKoQgzLSrpqSTaDEL/wLe2THCgx0eYm0lE + ###xbgdArSNFfWQvKG0PZUBHlthtOuguUp2F5mSeF7k8RAr02ref3mu335NSGIRv7EU + ###8Xt0nWx55xqBVdSUx57RPf+GqTLJ5yZel3WER90UDZ+d5KzDW2x9Wefey3asmMiH + ###y5LOrKJlt3cPs5quBKhRbPkh3TwWG1wH9pD76FQq5knj+kQQg19jH5HyuXuE5ReR + ###hcYCKyS8W6HqGCIYV+bsXWY8KQ78gpk+Vlk1fkOR6Athwes/NrzenPDm8+SYf4Fq + ###6w9aoKTprrumW+XTXWX+7Asj4fQfF87nKcvihjPlyso9yHKOfYpp5YdolOsHwnsM + ###zYjoSiSso5W/sZhTUdKstsV8zXAaR1A5kV5tte6kj3Rc5u472a8ogYta2d65S4It + ###2eqp7DOS7id47Wfm289YNSq/ksVZNRN6KktPS4u/bnpkRN7EmaNrtuK5RyczerrD + + + +Valin, et al. Expires November 18, 2012 [Page 314] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###hJl/LOlMw/o0WQBHZ9DGvOA2Ev1X8h+36PRJm5EcqTRHC3Rt425a6Ck8vEOPX7ER + ###qMSwuPfTryvcU3CXToiD78R2rp4sqllye0G58+rGPQd07ytQpTpoImtpAYNmxLsb + ###UGeJidiU4wGp21ZAKulJLiDiD5f91Wqsa8e3m8yrVixXTJsh5pyNb89mJvIVkfyU + ###9i/nV+ZW+ZJrts8bjzLZ9YfPdf0xpuraJnMRX+KZJKpqbDHdk85MvbkHzMIsJSTr + ###MUoeorOEwa6Vu6GebG1xTmcXL+W3RD/L64Z3yimZ2ol3TUeoJj8H6UFcxdNlPkKm + ###8SrLjySBTRZT0Svg0bO3OtssP1/1KnGfTBvVCXwocdgEySvFHKbjTMSuBaoYfI8X + ###QGHC+ibDKHoTFrTDHo8bAbmgw6tdImnYCVZTBKijVzs/FryS+30ZN38xyQMz8q3O + ###sRrlLfeL1YIHEm+EmVUZZe1XolooqgaByEaS4B+Pl0f/CcZD9B9PVt2VbUE4f9vW + ###OkuBt40XcVNeqhHDHI7bBw+PT3cufADJaxRitsLeh7hmr3uJYyKkxAJSkW2h5Cg/ + ###UqLcWPANIinKSSq5TQrKNHQJq8xKlnXUwuLs5p80rM1iGoqjUyvLNQtCdTsMN0w/ + ###HYgKiRVWNI0pOERckrviZnrc+7AqsB5PNB7NKAPaC2m5xwJgG5bchtGBwLv7oq21 + ###xfNc0Zk7mINvhLPGOJwrVY+ebKPs6dk2opuEmA5mXy6U0nNiJN9MxXNjxFyTD7BG + ###Tkcorz2pREWyM11AkQcY2gRBWOaeinjWmY6MDjk9ujqyFziuBPcc57xweXJoubG7 + ###tRSHJoe1Iu/w3BlpjvEddSPmGr8x5/im/1o+0SuuD+YEL4cghuLFXnvQlHFC5lt+ + ###lXketLv3aSKG0UnCPkwKN4tHMlXcSo8ezRTbM19Mn7K4sfxXI1IGeCmu0Zbv6SIh + ###9W5ZAZLO6U47DJJp+0XckZuPiLA7jJKWs3XSABHxvshsKwktFZS1uUExTNypYzyf + ###ewwZtJTWve9ldv/FDG3MqIB3cLJPIBTEGFqG3Fzf732/c3JycNx0xeMWi3p+oDx1 + ###9UR+y0Is2WVxI/kOyDI+/JoHfjXi293zqPSfDNgi1SequcamA/IzvQsoNwuPi+72 + ###QnKpB5kew2mMkz0P4s7Ogbr38Aqw4Mek5kwVKi5Fk/uV8ZT7JhWCTmsS9Pt0MV9c + ###WStub1fj8R8JioHsZmUr0fjFHRC9DeexKk3iLvuwmbwRIKWBTLeFch7NDA3thXW2 + ###bF5mZt4L4MXwTdD5iPOXFvMuV3hBXZsC43VcEjiB3jaB/gc9fOFIqJnz/NNiDuIR + ###d/GJ5CVzr1jcmPdjfuV+vgNCaiFei3LejuV2ty4EXN3FEG9bO3KueqyfXKu05Lwf + ###j3dmhh1HXrVCC7ZuiaPswg6vlnRWZ0fomPHLsYDmbWbHfljqsQMmW7nT5jGDz4w7 + ###y2M5GqYYV/8MJCYB6hpMcyx3KLtAVsaUHHq8a1a9lYSr/Q8bRob7mawM7rGljpw+ + ###j3J8JJcfUjIVRTcqjkN7S4u/taRjiot9p9cO3dyUlUMlx08sl0EH62jUl6kwmH0l + ###UuB3IupCpOhS65LqmG6ygihkWozHs9uA643tk8kqn3Ft3eByJxI8xCk9F0/AzF1D + ###l3JyP5IAXgL3w7UoPFU92FyPqmSkzNlq7euFsYCLFFJxUMw0t9Hw1x6QQ6O6XoND + ###jdezgHOt+f2x1ygAdryiA4ZrP/kTnz6J2+pgrOUtKt9FX8a7td66bG1apRTlWKh+ + ###4UtZYgrZ5W1Z/cThB5DsLqV9L4ugOIWO9JK7qSuToOrhRs6IyTQFPW9txRcJMF2S + ###JMVxLRdidwa2DA279lDWJuZWIp7+R2m3Pby5BBY0plxAw1t+ZcGr7eW7GOB5FqMe + ###Yf+aU6mucWjN47ZoyEXCBRWYB7rtjYQbatRriXm+lcDFJfPG5Wq69lItzWV2D6rr + ###9zBsccMp3GXdkKiUqrohIb5eZRMpthzkCqjO02vBpTYUYz4nF+J+A5Y8xOALwERZ + ###pXHVxmiH6jZrHIST2Kbj10xtBA0vmvz6GpfLbBHckUpe+TXra20JlKtoILKgT+oK + ###xi7xKxa/FGtUfMBiSmrBNPQx8hSYhyH9eiN2fRMTPF2p9jVG8Z2DtJPS5OTxrYwy + ###/m+hDSWHj348+9IkUxcV+OkOBwFvsJEsaEcxDhZqYi1pUR0UbuO+ZH0ajS7gCm/G + ###vcFHsXLOtl+WlFmOirqrSgMiNAm3AIVHbOt58ExWRPEGscRSljlvPJ7NSNO82Dm/ + ###4GaeSk4DT7KBBEbHDNDRp3C2wdEVdLSv1cEb3QzymIAVE3HxLcAvvCxOjUPaZY5z + ###3Z1kTRDFsMMj/PB85+QlSGNGcYhZUHV+IBB9cWDGxs+4PtFWKxbTNmfiTrNb59UM + ###Y6efWbKE8lW99z/ELdm5kWJdl59xXdLM72r16iCtmDotNWiCEPhnjIJmN8gZ9G4m + ###0LliV21gOCU0Brb7Y7wqYJdTyoRI7hHTLh6IaKy9C/7e76PpFk83nAecb0/OjvdE + ###VswntnRk8EanwJN00zDJvx910ZbfLNsb0uK8Wlmn2A6c5f7ySzZrRJIub9OFRiJr + ###/G4m3phFwvjBCRKMJnWf+FGFCF937jmpRS9qenrVOXjDV2TcifSsk/HJ6cXBC/Yu + ###AH122u9SYF+Xh+gBrYb93vXNBBT1goiuDT6j7YGycdCtNze6Xt4zymvW7lK+qDa7 + ###mg64Jk/JPcQeDcW2QCtFgok8mV5Ny4tmFSmf+OWTWhFXzrHx5zmq0obCcfw/8fmF + ###cokKrqErdOK6uDB0BmDZa/g9fqGOMy6XN5bcZToewXHAXV0I5vcMazP926zVpB2H + ###IqbbtKdp+RudUduGLmR/YCYBmClgXjXmgeXoK6ana9BmyTEcid2UkY1wPx30ex8D + ###2HN0MUgbSOV+kv6A4phB1yxurobDEA4MPXlON1BpiTvoT4jP8MjR+Kl5zGw7lL/l + ###dYux0tKTz0hlw4zQNrNwuvxOrOzwWvJzJcE8fRrTV7T8uZQgACj0+GyPRWHFvcnf + + + +Valin, et al. Expires November 18, 2012 [Page 315] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###QzYKxuicqqfDguUJh5SsGXGA5clHlOoK7ymI6NGPSuiW7XBJyy/Gcxqj4yijeShc + ###XgY37U89OJ+AO06G0SfI3fA7nN3gGc/n1KHEKJeY4GUQsDsEHXt+tb+nGddwAiEl + ###P6Ibp8ug056GgbF+A+DHOBr7OBjemVC2O5MpIFhYWCgZApaY5AGGo+l4hDHczyJO + ###S3nM8Pze9p8+pZWE3z+gAxH8lJv7i3InGE7hTLwY7pEIo529okNcdgz8XbH53oaz + ###1g0e2fjJ9har2nVv0DkQSyfjRinweOEx0rQV1J83hN+gS7MPfY4O/yQ9bN7tU4fP + ###Bvhw/6hJAafk2NbaOTuarXggvUytG5i7TqAq6torKWXYFbjYE8kZYmXgelfaIbdJ + ###1BCvTaa+LGCt6QQvQCvEcWlm10Gs0utwF+R+lcxRtLTAq3ua4mxySoj4mptLLszJ + ###wjA9SwnLKJD0qy4o0U3KWuZYIuriQatT8J5Vrlar/lpjvbisRe7GVkfsga+zRvby + ###cLHIWfpV5KgvsWfPnunVyZXtKKWU5qd2q49Z6NojcVTzWYqytqoNaesFrKEuBpMy + ###zQOL8wkDXUH2aju2KO8hFPTNai6v3wAmXyQYtLU4nE/t/hQFFZgFCBM0B833Pm7m + ###xJTs/Ju08s3JLYzCzUa+/eRv0moPyn9YdS+eudIqC01DFDMcKbQltko+p3lyxSM4 + ###jYh/PrTLmmD1Fa3py7nXdDl1UZetVVWtLaBnAlZz4/iKxGeRiCgmZj6N1UZOz2HL + ###P97cihs1xK3jEMSvSxBQAEB3olqzm3oloSM513o82CnWz7YRAIMxZZWKwZjTh8j4 + ###OItw7VrQc1Pv7AQxJ+WmFQWNq2V4B7jWKM5M34en53sHytPxq5F5gRPBpoc8jX7d + ###NpbewSuN7LMuKdnJyJwpqeZb6blR8wBW5SoEOMNqAn/QnG6/Ns/aTClFKpc5nr5K + ###ugLPubhGIuP42hrXBGbTGSLQHxLnaVsFMoBIDkR/UGRtopPgvJHHsbInmftnXmJ8 + ###wPaxslzPetZ/g53zOFvnUdllLNlfypay2/4+eyoTir/upvrGG2r+zbR/8ePXkya4 + ###MFGJhAlvTtqPVaybV1iYbboPWBEb4pkXZu/01dnxwY9HFz99y/WpPHiBtAJCThaV + ###x+EjmntBqM0zL/Rc6HuU9Y4QMPOaH50g32gdHuz92fZkVDFz3p0519wfa4Mq8Gde + ###srOdvR/gx/Fps9k6Ozjf+wbSfEUXPbzKw7ess6bp3JvXxsjcW/gBqH0UunChZWb6 + ###wMClP/5elndlzkVPyCPjlefb6LNh5AErqXLczLpkp0d7B61ztHx+7d28jWkO5ept + ###lh3Ll2wDpBg4Kjs2Rpvp3Ix3vuk+YF00oOfaTlEc4J9gZ5lRivMv0rzzfsg6GaDP + ###vFTNo5fkFfRVl+i7rbg5XjwT4xN5J7x79aZ5tDf38YleTK3J/SiYe1VnRtGDzjUF + ###78xwHp+e/rDz/QGg4puAKr0bXZYN61Ztrvs6OdqKHmqphzfOboOOHOByoWiagaNp + ###NpIiT6eZoNUcQV8k1jjtsmWZ2sjMDJKn5rBsJ66ejbtm+ULcNZsO2QTf3vHBzrm8 + ###oaasSvT44GTvdP/gPAL//MIRNoc3LMMr/Sq+WI63ytU7xv1L0IuW5/h8zrYsTzlm + ###K22ou3h64oVaesyfCDiNfSFdAr3Ym6RiFVqTmSogsxyZ+x9Se2DmCzWa2TewIluR + ###85r+Zpeez2cxTpcKHeVj8p5P3eCqPe1PXthRdiIHWZSCbDpAv8BB3A+mKP1QMCfZ + ###E80rJRZHp1wd3pwcobHm1cEJsG1zOhp4X6THSzDoAuqLcc85gZAXaQ3NQ/3L0hKx + ###O2MWXQB3PLy3PXqk/w61vRoHeMVbxC7+6y/wjyYVDqdAM6vhuLNKf98CJfQ4+3nW + ###efgY6AzQaNToJ/yzftarjUrjvzxvrV6vrPkV3/+vildrrK39F/tTIdKe3J/kH/nd + ###ju7HGHYBB1+R+RXPYz/2RjfPTsfX7HCInrYoGuEWeDfuTSbBAMMv/jdoD8qv2uMO + ###e4tZ8dBHd3WZnOmCLpJO73LKk01jDBK5KTNOZfTkEsSX8T06A96GJR6gNBzTz+F0 + ###ssT9lHtXQtwrkb/yKBjf4uhdzDj2qdeloBHhqn41xKxJ6GINakuXyhmTfzV+dxsA + ###U8M/yhZoIcaUCJgotOQWI0qAW7RFTAKVh4VXAjvYx2A4ARW2xMNVyEmP4lLkmLz2 + ###sQEQjNjpt3u3wfhZAhQwmoYOCQVMUmV0fWRARMwFdtMddqa3aOCSa7UKyzCcYEnN + ###W0ws1Wv3wwjftE7kKq5NQE7rJOhNeCnOgA0wrAoA4rdsWBVg2OkFk/sSOzq4OMSl + ###pp8X4yk6ywx4dDZNiwpO4rqMgg4SAM6JDzUch+i9eY8e7uS7Dgch8Hl4HGCHAOTt + ###cEKdcNRNsKD8uPcpSg0AmAqHV5M7pApBatE4cMwhBXICp16Q3sJQzfDi+6Mma54e + ###XrzbOT9g8PvZ+enbo/2Dfbb7E7w8YHunZz+dH738/oJ9f3oMQmWT4WUx6O6gluzC + ###WX7exG7+3//bacLXf/87vd05+Ykd/HgGcmOTnZ4zPA2PoEcYAlSKi6ODJmDsZO/4 + ###zf7RycsSg14wegq7OT56dQRnJrs4LdHg8S/Z6SF7dXCO7jEXO7tHx0cXP9GQh0cX + ###JzgcyEHkvsvOQOg92ntzvHPOzt6cn502DxjOcP+ouXe8c/TqYP8ZwADjsoO3cE6z + ###5vc7x8fWhE/fnRxQbzAHfcJs9wAgRfENh6PZ7h+dH+xd4LSi3/YAjQDkcYk1zw72 + ###juAX7OvgxwOY1M75TyXRbRPFNZjbzjHb33m18xLmWIhjR0cNdgPLtPfmnGQMREnz + ###zW7z4ujizcUBe3l6uk9obx6cvz3aO2huMDQ5Y6s3zYMSDHKxg2OLXgBx0AKa775p + ###HhEKKQzg/M0Z6p9FWPV3WJSO7e3A1/uE69MTmjMg6/T8J+iXr5xYjRJ79/0BvDpH + ###9BLWdhAdXIvVm8GQgMwLbbLYz8nBy+Ojl6DAHGCDU+zo3VHzoAiLdwTwvcRecfB3 + + + +Valin, et al. 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Expires November 18, 2012 [Page 320] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###3+L7MHTYrozMM6R1h3wIs+9LfNcmKsRGeDTF9Lk3BL1mt1ia4Z8AgB6EY3/IXsFz + ###ji51Mwcs72ryBxPle1v5ro5yNrp5Op3JF+XHELYwf+JvBtdgOZ9NC+srykAtSqQj + ###XrMnjNXtCvu1IssRKpW28WRSCY0nhE1FPmOu5jRavuBo+bKnlJ98iQYAD5Q++XJZ + ###Ka9uHpfwn6JcKmGi4cvqWkECKLm2XZx8idah6c20qYVEuLLCjDBDCZMW6pww+eQh + ###hEmdP9TZA79PvsrvV/x5njmF2sEQ1pOvGu5ftXlnctEOFIlYmXy9rIju+HqJ4+CC + ###JhmUa3hpzgxJ8wI2fBVUiG9XiB+NMPiqIkdiOrzwLit/ldUwAAViNdW4gBrupcrs + ###/NOpaGGkxSljz4Ke+owNpHGgPhsHmuM5QKkEPf1RPu6yyiuV9sU4uCwm8NpwX+6V + ###KmG+ouNgpcJmAi1w4zjYV8afPQ5KFX2IJrgkA4bFijJdadzppb6COZVEgwb9Cgi4 + ###uWgAWKAdIAS9FZdUA7X6ECi8XKlMgxKLJagYugs4xSvcxp9MWpnIrVxpK9llZXhR + ###voQpRJGuUvTjUg+zJ6tVKp7Wo1NaAaDQjpurnR+x0UMTBBqN+YzMjg25OnCKlsW6 + ###VfBcqSKcHp9X/8BneJViaa14iM1gFjnYKLVv6d4oqLR3Y+abOgz9u+tB6fTtuVU4 + ###bI2+lngy0CV2PEjLaGijLylfXOWiSW1fMBSQRmRJ2fGcDWfL2YYNoeN6jrvhuFuO + ###B483HG/bWYe3ZWdj29nccra2ne2y8/sWFIOim1iqzLK8cUIa1Xqj+bF2CtPo/61a + ###hQ00ScbfNarvrIKLoabJRtNrgRJEq21rdNPmSzwzlRXx0T31HO3acdcNwGgjqT7w + ###1N25uhrDrwf93ZX285P2i7JJXA/u0AsY1aXRSNv1/6Ftzyddv3/DjPjRs4eEZ2J1 + ###0OqqewGLrxTRT21zYPH1IvrZV8/AIm0FcxxqxfTxHj1+YPO49ghk9Z/6o15rIqwo + ###u1znxL7ZW//+nb7sb6Vonu/D1o2/Yz0PrYtSeAn/jAgz79La68Ce310Nv+2zrx5+ + ###xRDNbPhQR2NmcTaw+FZR1VXF0ivHtMtxAw2+3RsWGAj30lkuhcs2WiW5EhRV4Hfd + ###qCC7G0S6LyDIUiThE8agChsj9IDYU2FjlAmI4GwGBiMVA2qhNR4EvIR3KXUsfMey + ###Lr14wb7zZEz8x5bygydvYj/Y9cpoLdY7QsxOy3oSTMrAfOVT4F6HRdB1WLhXxyLg + ###DmZoIMjSapDaG2LOUxjCcvYIYYxCzuEDWwsxRyjscGa767vxsGuEXVRiM6nEllri + ###ZUIJoikq8btagqGude6auUYyQWFiQ5M6TD2VzmDo95WuHl0xRqGXEL7PMsxUKfUT + ###AsAu+e15+BtaZxwBbLrw41ynYeDFMPDmxyCSy067Owh9omc6TmvFc9AcRTgCcsbE + ###WAuktqDQhW3ofljGwmGrza848LmzophpXkwcbM7xBCnK2u0KYpRdt5h+adM9uZjA + ###XmV1E3RpUKjh+wr7u8J5SqwzaHpIwOEBcfCcvpbCS1aMcOONP6twIEVDT4zznQVY + ###Zib7EC0keBelR3wpPO/ePavAP/aqnA9l9o/uoH9j8wYd43FC81O7S6K/py3XKYjX + ###+uFdpxO0Az865GB9jGjvPQ9yIK03M32CZwtmRaBZ0uqvaPsIe037SRrtVbICzcEW + ###2cxelEYLoT9Prpju/GlKfZorEup/YtU/Z1dnM05C9c+s+lrxSN3r+aMShZbEbO5j + ###DEvC7CP8bhLM1sENhchAvre6rBtalJrYtyjRHBtwqmllcuV8cogJDuOFM5ES7wjL + ###CCWGVxnvaJx22CCibe6EvqpNkDf8Z94Im36dhzyNKFOw3p76wpB2wuHB3jXU8gSt + ###fK14TB4mGPqj1wq/4hRY6A6+4YW62+Dm1t7B9ADXh2u4rbbCLkyT4koW14ddVIb5 + ###3uDKVNSFRpuq0E6uSOfg+29UOTQ1aaUiNZTyqntcNMuXXKNGkuaeSCRSh1QCsUjk + ###ZiaRrL0S0loq7Zd3fyKR5fU4lSt5qMRZLNiX+5+1YkME7uFE71ildSTTW93shTqd + ###EaXltO7MSetM1CK9m4xcqIJ9mVYrS7mkk9sDmFK+YceGgx4sKqNBGJbGre5XcQ1U + ###Xz49rQOnkE1TV9cZSRy6lSwiywq2o8ySrlIyG+JKBSQD5H+Ur4IbVeiaohIxjC7Q + ###iuGgiztx4yHJvsUMh0xpBqUfrVrixxSjVobEfGKE0CpCtpJMgUmYBVKFBdYeKsmW + ###mMeFnWTlWGKsvfcpsDWsSKi6++079K8WQS9gzulh1FamTQbhoA9DESYjjMhFSVlC + ###n6JSiVDp2X0yU4/k6w8m8JNxTw34wB4+6A+xjFWB/pt8Se2BB1bmc1YZvki5KYtU + ###DC9vN/78IfacShJ6WeKlVXngVbKlRquSDR3vShmcnCaTWOXBrMI5HSees9ekPlU4 + ###MZfdYERjHpjWwuXPH7FdrNCJRebAMUop7HwHVqvNfHdEwAEGfL1ctt78ya/ew5YB + ###b1RcB5iHytdSWTLz2ypVwnv8roepFBwWxQ4bgiloiMHfxrcsuBy/oB6FN7hiyhOq + ###JQ9UmAeE2yAE2BLG7QYVbgRQzDUV1cRHfSdu2LMKpFUnVGBjTVZILVEi7y/YWsrj + ###5owdFzemVTust6odYYCfNveKileim6tX0nY/ZRp48QJ+qyas+SbqvIcPwKFsGV/L + ###PyaDHuijpe7gpjDy7ZIaTB6k+a0xkRrzZ2sEYst2/hgfdo2MwWxvgOmQQXT1iIeR + ###GJODOe6irwc9GVWwO/ZH4aqWTgY3XV/2Ky9/Jw5Xtl0bjxZwIdk1S1Uq2+XEt9Wr + ###lYrKP/NEoHplrVWsgtKdpaifFcZFYtHBGaR6VRSSIvZI70MW9bkTTPxrlleiG/zZ + ###oiHKHN17PoxZGJe/jXwKIUnxF2n4+8NxtEotRYl/cOr45x1AGT8Q2xImk4hf1c6a + ###YkLE38WKGAQwdlbgR5H9/sFH03DwDfOErwnVyF0tr/Hsb39U3HK5WHDxSLWIsuGu + + + +Valin, et al. 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Expires November 18, 2012 [Page 323] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###yDz0Z1MAa+2SOxEtQ2N4ad2yjXthiQe92iEvq2/rd8dkL5b1F+qw0larGXGOpGIh + ###zCUU20wwrE/BrOUVy6XWTw9jcz6fZ0xZTVJS9ZYSZ3y9ubdzNCfPv2Zu7uMczQkF + ###fubG6vO0phkbZm7yeI4WhS6d0NhfMThxn0++HssGnoerCRNvbCKWszhO26eHjvUW + ###/v8I/9fxn+NDJa9gxsdkgiHs05b4WBptvo3Vb3fOO5IjnWShkSyhzDSSvdXNFGHI + ###WL82yuWZhW6OZrw5mnHLs7fjztGON0c7m7M3szFHM97mzM1s5WpmvZiDnlyzQRgN + ###a+lMSi7hvXmmBZBhx4L/XNyywf9oJdwq/y+YGZTt3UJzgwrHIDBpB0naRowzlr37 + ###s+iUW9TFtmESjIGrtgf+5eRFG+1U6sztuPtz9oyRv/FiK00ExWCZqT38JCrQ2LuY + ###nNzH9+ttTeV6bJRBaVpeAGGqHtcvmCr2k1BGnW4Klw3vXc1zlwMwsE7QF3/5aCQr + ###7kLywyAYGKp2519Ok2ndXoi8GDADb/P9z5PByPq+eHcRlMQugxd/Z5dlrAqzdBaA + ###Semmn7mgkDf5VzpWXqyLFDjmBkWco+A+N3Je18uY5ylQdPvnEex6j0RxBGgKydxZ + ###+2+leeuxaN7KSfPW30qz8JV9BKoNUBl0aw66Uynf+JmUb2w/GuUb23kp39j+WymP + ###/GAX21xGUDLojQpNpXXd+4nEco+gxekVgKaRzMs9Ug/ryHIrg7VcxcSeeOF2BJje + ###9GGHcm2F/ngc9G/YIaA8BuQMMZf5rEPb6SaBH7EjM7HPiOwrkScB0KoczSln9nG9 + ###fM+iaJnxF/vKkU/KsZil3DCP1acwK1c+/DcGtPoWO/FiATUz7CdKo7nOxLjHArpM + ###4X6Lnzi2S8JxpEPc6AyGPjplMR+r5dGVkCk64IQy0yk8Gtx1MZcvRmsFcuimLGYq + ###9s0TYGw7/3ke9Urk1GEcxfPMNRGwTuj7XwvkDlZ2rHq1+l/N6ukr2RjfN3fGfreL + ###xeSbmLWMGMauRIcY6ZQ6jejAh3ZWk3W1bxIcRRDAGg8aTq5M9ppQ39fMUZmOYJ1g + ###4gErZZGiVDeIKI/cTKiajduaVHBPOk0sXCEWGJtGyAUvCI1+u1rRJQNezSwaPK5B + ###smy4qmx02qCz+npPLeq/AfOqiAEtplgeF10zs0oPP0f1Z3CsFzJfsbgUOxrhATkP + ###WhzNNpmuEkcAG/jBWhYhHyJnCRY5bTyiZMkI39ZmwkS2yMfYJzO7UegMGXfRruDI + ###9FKHtcb5QaNaUKZNBadplcV5ViE6icpf+cPheYEf685UCYPBwNp8UDttFNozVcbV + ###+wS59bkgLZj5q9cot3jzuHpU0AyM+SGwXF4YOOm0elIvaAa+/FBeNT4VuL0qfyW2 + ###tDQxDFHzXfX8qGDajiKPsmxYrwnI2X8dvKkevCq8QG9O2455c5nXyeWYufajUSrs + ###XdNG6c8YmLztv21gYixIKwo6rQwfhVsUyTn11H9nKX7OzL0DgcHLMoLJsoKZEoI3 + ###Cbo85J8CvedfB3e9GaGLA/YpsOG3PyNk7fx+CvjwDqR9jjbEif0U8CJWzFTI6AY0 + ###BRZmpkyBowZ+TgfA/fZSYCjLamxVTRpBr3iQBxat7zms/G/+FGt+4fl1NGLtrJ1u + ###oTvo39gpY50PIiVMexyLKg/VIBBg+9HW2Hq+ut6xvl6theknnssBRX6gfRUj4rrE + ###tlU8wu7qzKgr62axvFouu6nVzQ5ylNNgMffSnp3tHYt2j+Vj0V2/ioJXRW2jyTnH + ###NncLAOiIQ0s94slcsHhWjwRgbQlM050cDgZL2cp21DjQU/VqasRdtJEf0m0OVi+8 + ###kmBuftkokV7t8mxfV5u1E37uEa8ruyoU3Z9N8bSOHQq8eEEW6IL93CtrrgV687xF + ###zBPASm+ZNnpab3gx3UHBMFbgTFXeibz64y4rsYDuMltCSi0vq5aXVsvNqrWeVmsz + ###o9JGKoKb6ZU2ZaUEz42karojA5cu0UN7MTcT7GNlOil1WldhIToHs609dBlxPaPt + ###xK6UklCseHH/pTQcXOZBrMjwfoJzT5bU5N4EU55b/cKZneAsol0kMU5dfqR6yEwd + ###gz+W4t/UYQeTjBxw6xkDLr/KwIFtICx7N6X9pHXY9G2IR6Iy3IZGePLeQYdgmOMc + ###y3WsDccyt66svQ5OhPgqwXkxLs94bY7dYcL5Vg2P1b5NAK4U34+byb5/V+HtTZWq + ###2Eag1r9vdTFmJg9zB9Buxrc73NKmwE4Qq6mDNS8TzWtbOdmjgqcVjNejhhTU0/oN + ###6u+pFM7Ku/MWWWswHjLtn5w8XmIseTptvbjZzLoBjWqqZTMmPI6m0OXrlMTBTjmV + ###4tyJzIrPWI66xeYraeSI4F5EF8guYe+RNG/lnwMTgZbnBxpZFxIBrycC1ibMxHre + ###Zd7R0uFhJrUdYVFq8+pd27hwR3cZMAOHuCisOESJrBmiWAQ4nuskpaP5vds4E8IK + ###Q/3CKwYrGKFv+7t8cJlUvlAIKYDg8bH9D0zGAktjif2Nlw4wPUclzOIiiq6kf09V + ###D6aNb5ZPJIkrewm79TivVCTjdyyIWtgTxx0ffmSsD4q0MkFFU7ra+/rEF1shkvyu + ###xWboWWXaeqHe0ML0LKJmjLLkE6V0XvN8awr4fSu9ftyZqZSOiupcrDawJw+4Fmvg + ###h/lgrQjbu44/ftAyZyWSueeWy+Wk5vW7cG6S9C9kg07AfIp98rh2enDSPD84fV0t + ###vEhZoe3sDQseD+ZcVS01uKQUeZFQ0o+S6WVvSVJMjNmGxrk8qo3bzzg85LDcTZ6S + ###lOL78aMv2CtHpYBz5llXyZ3Cyqiyeiqdgm1sdlL38tpmOmaEnraZxlPqTuB3r2N7 + ###ajVYrbY9i6okba4x54NfiIpEu0jsRbp5acdZEbd3oUWa0kdgZHr9yuR8/a8SkzI6 + ###/ocSJnGbsqkWiEY2I1sdnL8c+dTNLbOuiqS9hjbGwk0oiINqiWpV7Ghnv6xos6jj + ###78U8h2O9XOBp5vYrGcY3ZRkhRR3T9wz6USjrb7d+H2qjxhD0SyKEd8JSQ+3pzSS2 + + + +Valin, et al. Expires November 18, 2012 [Page 324] + +Internet-Draft Interactive Audio Codec May 2012 + + + ###I4rK+BpppThWrfHY7w0x8gY/8WFmXxUbFu/dn4gYJ0noReuO1h36ORbq7izyh/Uf + ###lDXX2jF2OJoIDlDp0q2pIKf2bmLbqZYOhdSRf3PXbY0EnQtRwYyqJQ1z5Wci7uU0 + ###3JdmouZnszgJzR9LSVs8HZP9hL1PmoDG6tIpaXr3JaixiVqPAbZEYKfv6tNR5ZtH + ###iroT7mYVqUDTF8FKAZuMWrQvs+ooylMlVIKvTysNulelEBoR23MJVnwZmKaMJjA0 + ###cXVI5LydxdR5VoxZFo+pjPiRUzj3mHDiv1apkrniaEoKVUhUFbPGd4wtdOAexY9n + ###G1FxKj/VpiRUgejgXsfenjrWU/eOzxI3j6K9yHMBVA+ak5JVDyNek4oOTNjogoLX + ###LamERSWiFDEjYMV9q3vHUpaJp7hkiSQvRnyG5H3cP7Q19RK0ZgoBohInacMXNLeK + ###L7TCau8NgnCM5Go4tkzHVSfuZXpOcBmJmB/At3pB2GthYu4pFspl4W+ZxK1pdYM+ + ###vzn7vHu9Y5Unz7e7E+s+5N+yZZEdC9NuKatUpGpQ8Vxsyw/OlDTDbpamWqarlVM8 + ###cpfUTaiIdIbflSTJJOJ3LFuQFk+Efq9oO9eicu9AhGzDI129DKie0UsbtgD6y53o + ###5e7SHPvY/ghdJsqr5bi+8yzxWCbDFGd9pZkR/qhWPKsogwtaX1dWUjeviArwJ+hf + ###AIRLqFZgce1s/iT/rBYdoBcI6Br8TcQHULGBu66/mYiUiJuX0WvyajAP/2eq8jpS + ###IBwfMLlTvx3bqlJYPrMl9fvWRtLxGTWsNhpF2yvwbyu6BNjWC2HO/LGUPCm17v1R + ###6yZKP7WjUfr8pXA4SZ8fXL+0XkSCjEPbgmKVFZ1LBNh69iDd0ZyyOmXgcvV1mAsZ + ###HCMGQporSqbcJ3CpPQ7uU5g0hUsSJQCSl0dYNp1PHA1cPfrXrRGuAfcBD1mWhQ2h + ###Ev5zNC6QAK6xaaNE4kgorhVY2nOjv6YxEpPl4iwL69EDuUaHqI1+uw3aqIeO/RH6 + ###0iHCIz/EwFXWN3+E2A9GMLnzoUFh6F9VD9+/btYbZ+fV5tHJWb3axCCpdeZGGHS/ + ###NhuYgrUOMlvg6QiDHm41x5PoIolmN73GyHODBzQBqa/F3ka8ht+C1yOfG1aihHso + ###Jfqgki7eUenI8zu2DsXXH6ol3+Mv42VHPRxQl6n6+6Ojar2OqZH+7enz9Hn6PH2e + ###Pk+fp8/T5+nz9Hn6PNbn/wN2pqT+AFggAA== + +A.4. Test Vectors + + Because of size constraints, the Opus test vectors are not + distributed in this draft. They are available in the proceedings of + the 83th IETF meeting (Paris) [Vectors-proc] and from the Opus codec + website at [Vectors-website]. These test vectors were created + specifically to exercise all aspects of the decoder and therefore the + audio quality of the decoded output is significantly lower than what + Opus can achieve in normal operation. + + The SHA1 hash of the files in the test vector package are + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 325] + +Internet-Draft Interactive Audio Codec May 2012 + + + e49b2862ceec7324790ed8019eb9744596d5be01 testvector01.bit + b809795ae1bcd606049d76de4ad24236257135e0 testvector02.bit + e0c4ecaeab44d35a2f5b6575cd996848e5ee2acc testvector03.bit + a0f870cbe14ebb71fa9066ef3ee96e59c9a75187 testvector04.bit + 9b3d92b48b965dfe9edf7b8a85edd4309f8cf7c8 testvector05.bit + 28e66769ab17e17f72875283c14b19690cbc4e57 testvector06.bit + bacf467be3215fc7ec288f29e2477de1192947a6 testvector07.bit + ddbe08b688bbf934071f3893cd0030ce48dba12f testvector08.bit + 3932d9d61944dab1201645b8eeaad595d5705ecb testvector09.bit + 521eb2a1e0cc9c31b8b740673307c2d3b10c1900 testvector10.bit + 6bc8f3146fcb96450c901b16c3d464ccdf4d5d96 testvector11.bit + 338c3f1b4b97226bc60bc41038becbc6de06b28f testvector12.bit + a20a2122d42de644f94445e20185358559623a1f testvector01.dec + 48ac1ff1995250a756e1e17bd32acefa8cd2b820 testvector02.dec + d15567e919db2d0e818727092c0af8dd9df23c95 testvector03.dec + 1249dd28f5bd1e39a66fd6d99449dca7a8316342 testvector04.dec + 93eee37e5d26a456d2c24483060132ff7eae2143 testvector05.dec + a294fc17e3157768c46c5ec0f2116de0d2c37ee2 testvector06.dec + 2bf550e2f072e0941438db3f338fe99444385848 testvector07.dec + 2695c1f2d1f9748ea0bf07249c70fd7b87f61680 testvector08.dec + 12862add5d53a9d2a7079340a542a2f039b992bb testvector09.dec + a081252bb2b1a902fdc500530891f47e2a373d84 testvector10.dec + dfd0f844f2a42df506934fac2100a3c03beec711 testvector11.dec + 8c16b2a1fb60e3550ba165068f9d7341357fdb63 testvector12.dec + + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 326] + +Internet-Draft Interactive Audio Codec May 2012 + + +Appendix B. 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 packet 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 25). + + o Code 1 packets: It is the length used for both of the Opus frames + (see Figure 26). + + o Code 2 packets: It is the length of the second Opus frame (see + Figure 27). + + o CBR Code 3 packets: It is the length used for all of the Opus + frames (see Figure 28). + + o VBR Code 3 packets: It is the length of the last Opus frame (see + Figure 29). + + + + +Valin, et al. Expires November 18, 2012 [Page 327] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|0|0| N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 1 (N1 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 25: 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|0|1| N1 (1-2 bytes): | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 2 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+ + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 26: 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|0| N1 (1-2 bytes): N2 (1-2 bytes : | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ : + | Compressed frame 1 (N1 bytes)... | + : +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | + | Compressed frame 2 (N2 bytes)... : + : | + | | + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + + Figure 27: A Self-Delimited Code 2 Packet + + + + + + +Valin, et al. Expires November 18, 2012 [Page 328] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|1|0|p| M | 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 28: A Self-Delimited CBR Code 3 Packet + + + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 329] + +Internet-Draft Interactive Audio Codec May 2012 + + + 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 + +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ + | config |s|1|1|1|p| M | 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 29: A Self-Delimited VBR Code 3 Packet + + + + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 330] + +Internet-Draft Interactive Audio Codec May 2012 + + +Authors' Addresses + + Jean-Marc Valin + Mozilla Corporation + 650 Castro Street + Mountain View, CA 94041 + USA + + Phone: +1 650 903-0800 + Email: jmvalin@jmvalin.ca + + + Koen Vos + Skype Technologies S.A. + Soder Malarstrand 43 + Stockholm, 11825 + SE + + Phone: +46 73 085 7619 + Email: koen.vos@skype.net + + + Timothy B. Terriberry + Mozilla Corporation + 650 Castro Street + Mountain View, CA 94041 + USA + + Phone: +1 650 903-0800 + Email: tterriberry@mozilla.com + + + + + + + + + + + + + + + + + + + + + +Valin, et al. Expires November 18, 2012 [Page 331] + diff --git a/opus.spec b/opus.spec index f6fad53..325366f 100644 --- a/opus.spec +++ b/opus.spec @@ -1,6 +1,6 @@ Name: opus -Version: 0.9.10 -Release: 2%{?dist} +Version: 0.9.14 +Release: 1%{?dist} Summary: An audio codec for use in low-delay speech and audio communication Group: System Environment/Libraries @@ -8,7 +8,7 @@ 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-11.txt +Source1: http://tools.ietf.org/id/draft-ietf-codec-opus-14.txt %description The Opus codec is designed for interactive speech and audio transmission over @@ -60,6 +60,9 @@ make check %{_libdir}/pkgconfig/opus.pc %changelog +* Sun May 27 2012 Peter Robinson - 0.9.14-1 +- Update to 0.9.14 + * Sat May 12 2012 Peter Robinson - 0.9.10-2 - Add make check - fixes RHBZ # 821128 diff --git a/sources b/sources index 3cfb831..9afe6be 100644 --- a/sources +++ b/sources @@ -1 +1 @@ -afbda2fd20dc08e6075db0f60297a137 opus-0.9.10.tar.gz +c7161b247a8437ae6b0f11dd872e69e8 opus-0.9.14.tar.gz