1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
2 /*
3 * This file is provided under a dual BSD/GPLv2 license. When using or
4 * redistributing this file, you may do so under either license.
5 *
6 * Copyright(c) 2019 Intel Corporation
7 */
8
9 #ifndef __IPC_CHANNEL_MAP_H__
10 #define __IPC_CHANNEL_MAP_H__
11
12 #include <uapi/sound/sof/header.h>
13 #include <sound/sof/header.h>
14
15 /**
16 * \brief Channel map, specifies transformation of one-to-many or many-to-one.
17 *
18 * In case of one-to-many specifies how the output channels are computed out of
19 * a single source channel,
20 * in case of many-to-one specifies how a single target channel is computed
21 * from a multichannel input stream.
22 *
23 * Channel index specifies position of the channel in the stream on the 'one'
24 * side.
25 *
26 * Ext ID is the identifier of external part of the transformation. Depending
27 * on the context, it may be pipeline ID, dai ID, ...
28 *
29 * Channel mask describes which channels are taken into account on the "many"
30 * side. Bit[i] set to 1 means that i-th channel is used for computation
31 * (either as source or as a target).
32 *
33 * Channel mask is followed by array of coefficients in Q2.30 format,
34 * one per each channel set in the mask (left to right, LS bit set in the
35 * mask corresponds to ch_coeffs[0]).
36 */
37 struct sof_ipc_channel_map {
38 uint32_t ch_index;
39 uint32_t ext_id;
40 uint32_t ch_mask;
41 uint32_t reserved;
42 int32_t ch_coeffs[];
43 } __packed;
44
45 /**
46 * \brief Complete map for each channel of a multichannel stream.
47 *
48 * num_ch_map Specifies number of items in the ch_map.
49 * More than one transformation per a single channel is allowed (in case
50 * multiple external entities are transformed).
51 * A channel may be skipped in the transformation list, then it is filled
52 * with 0's by the transformation function.
53 */
54 struct sof_ipc_stream_map {
55 struct sof_ipc_cmd_hdr hdr;
56 uint32_t num_ch_map;
57 uint32_t reserved[3];
58 struct sof_ipc_channel_map ch_map[];
59 } __packed;
60
61 #endif /* __IPC_CHANNEL_MAP_H__ */
62
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