a2dp_codec_sbc.h

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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) 2015-2016 Intel Corporation
 * Copyright (c) 2021 NXP
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_
#define ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* Sampling Frequency */
#define A2DP_SBC_SAMP_FREQ_16000 BIT(7)
#define A2DP_SBC_SAMP_FREQ_32000 BIT(6)
#define A2DP_SBC_SAMP_FREQ_44100 BIT(5)
#define A2DP_SBC_SAMP_FREQ_48000 BIT(4)
 
/* Channel Mode */
#define A2DP_SBC_CH_MODE_MONO   BIT(3)
#define A2DP_SBC_CH_MODE_DUAL   BIT(2)
#define A2DP_SBC_CH_MODE_STEREO BIT(1)
#define A2DP_SBC_CH_MODE_JOINT  BIT(0)
 
/* Block Length */
#define A2DP_SBC_BLK_LEN_4  BIT(7)
#define A2DP_SBC_BLK_LEN_8  BIT(6)
#define A2DP_SBC_BLK_LEN_12 BIT(5)
#define A2DP_SBC_BLK_LEN_16 BIT(4)
 
/* Subbands */
#define A2DP_SBC_SUBBAND_4 BIT(3)
#define A2DP_SBC_SUBBAND_8 BIT(2)
 
/* Allocation Method */
#define A2DP_SBC_ALLOC_MTHD_SNR      BIT(1)
#define A2DP_SBC_ALLOC_MTHD_LOUDNESS BIT(0)
 
#define BT_A2DP_SBC_SAMP_FREQ(cap)    ((cap->config[0] >> 4) & 0x0f)
#define BT_A2DP_SBC_CHAN_MODE(cap)    ((cap->config[0]) & 0x0f)
#define BT_A2DP_SBC_BLK_LEN(cap)      ((cap->config[1] >> 4) & 0x0f)
#define BT_A2DP_SBC_SUB_BAND(cap)     ((cap->config[1] >> 2) & 0x03)
#define BT_A2DP_SBC_ALLOC_MTHD(cap)   ((cap->config[1]) & 0x03)
#define BT_A2DP_SBC_MIN_BITPOOL_VALUE  2
#define BT_A2DP_SBC_MAX_BITPOOL_VALUE  250
 
struct bt_a2dp_codec_sbc_params {
        uint8_t config[2];
        uint8_t min_bitpool;
        uint8_t max_bitpool;
} __packed;
 
#define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_GET(hdr) FIELD_GET(GENMASK(3, 0), (hdr))
#define BT_A2DP_SBC_MEDIA_HDR_L_GET(hdr)          FIELD_GET(BIT(5), (hdr))
#define BT_A2DP_SBC_MEDIA_HDR_S_GET(hdr)          FIELD_GET(BIT(6), (hdr))
#define BT_A2DP_SBC_MEDIA_HDR_F_GET(hdr)          FIELD_GET(BIT(7), (hdr))
 
#define BT_A2DP_SBC_MEDIA_HDR_NUM_FRAMES_SET(hdr, val)\
        hdr = ((hdr) & ~GENMASK(3, 0)) | FIELD_PREP(GENMASK(3, 0), (val))
#define BT_A2DP_SBC_MEDIA_HDR_L_SET(hdr, val)\
        hdr = ((hdr) & ~BIT(5)) | FIELD_PREP(BIT(5), (val))
#define BT_A2DP_SBC_MEDIA_HDR_S_SET(hdr, val)\
        hdr = ((hdr) & ~BIT(6)) | FIELD_PREP(BIT(6), (val))
#define BT_A2DP_SBC_MEDIA_HDR_F_SET(hdr, val)\
        hdr = ((hdr) & ~BIT(7)) | FIELD_PREP(BIT(7), (val))
 
#define BT_A2DP_SBC_MEDIA_HDR_ENCODE(num_frames, l, s, f)\
        FIELD_PREP(GENMASK(3, 0), num_frames) | FIELD_PREP(BIT(5), l) |\
        FIELD_PREP(BIT(6), s) | FIELD_PREP(BIT(7), f)
 
uint8_t bt_a2dp_sbc_get_channel_num(struct bt_a2dp_codec_sbc_params *sbc_codec);
 
uint32_t bt_a2dp_sbc_get_sampling_frequency(struct bt_a2dp_codec_sbc_params *sbc_codec);
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_BLUETOOTH_A2DP_CODEC_H_ */