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편집 파일: channel_map.h

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