62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
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/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* Copyright(c) 2019 Intel Corporation
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*/
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#ifndef __IPC_CHANNEL_MAP_H__
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#define __IPC_CHANNEL_MAP_H__
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#include <uapi/sound/sof/header.h>
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#include <sound/sof/header.h>
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/**
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* \brief Channel map, specifies transformation of one-to-many or many-to-one.
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*
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* In case of one-to-many specifies how the output channels are computed out of
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* a single source channel,
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* in case of many-to-one specifies how a single target channel is computed
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* from a multichannel input stream.
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*
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* Channel index specifies position of the channel in the stream on the 'one'
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* side.
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*
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* Ext ID is the identifier of external part of the transformation. Depending
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* on the context, it may be pipeline ID, dai ID, ...
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*
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* Channel mask describes which channels are taken into account on the "many"
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* side. Bit[i] set to 1 means that i-th channel is used for computation
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* (either as source or as a target).
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*
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* Channel mask is followed by array of coefficients in Q2.30 format,
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* one per each channel set in the mask (left to right, LS bit set in the
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* mask corresponds to ch_coeffs[0]).
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*/
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struct sof_ipc_channel_map {
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uint32_t ch_index;
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uint32_t ext_id;
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uint32_t ch_mask;
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uint32_t reserved;
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int32_t ch_coeffs[];
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} __packed;
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/**
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* \brief Complete map for each channel of a multichannel stream.
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*
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* num_ch_map Specifies number of items in the ch_map.
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* More than one transformation per a single channel is allowed (in case
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* multiple external entities are transformed).
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* A channel may be skipped in the transformation list, then it is filled
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* with 0's by the transformation function.
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*/
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struct sof_ipc_stream_map {
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struct sof_ipc_cmd_hdr hdr;
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uint32_t num_ch_map;
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uint32_t reserved[3];
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struct sof_ipc_channel_map ch_map[];
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} __packed;
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#endif /* __IPC_CHANNEL_MAP_H__ */
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