lc3.h

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/*
 * Copyright (c) 2020 Intel Corporation
 * Copyright (c) 2022 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#ifndef ZEPHYR_INCLUDE_BLUETOOTH_AUDIO_LC3_H_
#define ZEPHYR_INCLUDE_BLUETOOTH_AUDIO_LC3_H_
 
#include <zephyr/sys/util_macro.h>
#include <zephyr/bluetooth/byteorder.h>
#include <zephyr/bluetooth/hci_types.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* COND_CODE_1 is used to omit an LTV entry in case the _frames_per_sdu is 1.
 * COND_CODE_1 will evaluate to second argument if the flag parameter(first argument) is 1
 * - removing one layer of paranteses.
 * If the flags argument is != 1 it will evaluate to the third argument which inserts a LTV
 * entry for the max_frames_per_sdu value.
 */
 
#define BT_AUDIO_CODEC_CAP_LC3_DATA(_freq, _duration, _chan_count, _len_min, _len_max,             \
                                    _max_frames_per_sdu)                                           \
        {                                                                                          \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CAP_TYPE_FREQ, BT_BYTES_LIST_LE16(_freq)),      \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CAP_TYPE_DURATION, (_duration)),                \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CAP_TYPE_CHAN_COUNT, (_chan_count)),            \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CAP_TYPE_FRAME_LEN,                             \
                                    BT_BYTES_LIST_LE16(_len_min),                                  \
                                    BT_BYTES_LIST_LE16(_len_max)),                                 \
                COND_CODE_1(_max_frames_per_sdu, (),                                               \
                            (BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CAP_TYPE_FRAME_COUNT,              \
                                                 (_max_frames_per_sdu))))                          \
        }
 
#define BT_AUDIO_CODEC_CAP_LC3_META(_prefer_context)                                               \
        {                                                                                          \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_METADATA_TYPE_PREF_CONTEXT,                           \
                                    BT_BYTES_LIST_LE16(_prefer_context))                           \
        }
 
#define BT_AUDIO_CODEC_CAP_LC3(_freq, _duration, _chan_count, _len_min, _len_max,                  \
                               _max_frames_per_sdu, _prefer_context)                               \
        BT_AUDIO_CODEC_CAP(BT_HCI_CODING_FORMAT_LC3, 0x0000, 0x0000,                               \
                           BT_AUDIO_CODEC_CAP_LC3_DATA(_freq, _duration, _chan_count, _len_min,    \
                                                       _len_max, _max_frames_per_sdu),             \
                           BT_AUDIO_CODEC_CAP_LC3_META(_prefer_context))
 
#define BT_AUDIO_CODEC_CFG_LC3_DATA(_freq, _duration, _loc, _len, _frames_per_sdu)                 \
        {                                                                                          \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_FREQ, (_freq)),                             \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_DURATION, (_duration)),                     \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_CHAN_ALLOC, BT_BYTES_LIST_LE32(_loc)),      \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_FRAME_LEN, BT_BYTES_LIST_LE16(_len)),       \
                COND_CODE_1(_frames_per_sdu, (),                                                   \
                            (BT_AUDIO_CODEC_DATA(BT_AUDIO_CODEC_CFG_FRAME_BLKS_PER_SDU,            \
                                                 (_frames_per_sdu))))                              \
        }
 
#define BT_AUDIO_CODEC_CFG_LC3_META(_stream_context)                                               \
        {                                                                                          \
                BT_AUDIO_CODEC_DATA(BT_AUDIO_METADATA_TYPE_STREAM_CONTEXT,                         \
                                    BT_BYTES_LIST_LE16(_stream_context))                           \
        }
 
#define BT_AUDIO_CODEC_LC3_CONFIG(_freq, _duration, _loc, _len, _frames_per_sdu, _stream_context)  \
        BT_AUDIO_CODEC_CFG(                                                                        \
                BT_HCI_CODING_FORMAT_LC3, 0x0000, 0x0000,                                          \
                BT_AUDIO_CODEC_CFG_LC3_DATA(_freq, _duration, _loc, _len, _frames_per_sdu),        \
                BT_AUDIO_CODEC_CFG_LC3_META(_stream_context))
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_BLUETOOTH_AUDIO_LC3_H_ */