cras/src/common/a2dp-codecs.h

/*
 *
 *  BlueZ - Bluetooth protocol stack for Linux
 *
 *  Copyright (C) 2006-2010  Nokia Corporation
 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#define A2DP_CODEC_SBC 0x00
#define A2DP_CODEC_MPEG12 0x01
#define A2DP_CODEC_MPEG24 0x02
#define A2DP_CODEC_ATRAC 0x03
#define A2DP_CODEC_VENDOR 0xFF

#define SBC_SAMPLING_FREQ_16000 (1 << 3)
#define SBC_SAMPLING_FREQ_32000 (1 << 2)
#define SBC_SAMPLING_FREQ_44100 (1 << 1)
#define SBC_SAMPLING_FREQ_48000 1

#define SBC_CHANNEL_MODE_MONO (1 << 3)
#define SBC_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
#define SBC_CHANNEL_MODE_STEREO (1 << 1)
#define SBC_CHANNEL_MODE_JOINT_STEREO 1

#define SBC_BLOCK_LENGTH_4 (1 << 3)
#define SBC_BLOCK_LENGTH_8 (1 << 2)
#define SBC_BLOCK_LENGTH_12 (1 << 1)
#define SBC_BLOCK_LENGTH_16 1

#define SBC_SUBBANDS_4 (1 << 1)
#define SBC_SUBBANDS_8 1

#define SBC_ALLOCATION_SNR (1 << 1)
#define SBC_ALLOCATION_LOUDNESS 1

#define MAX_BITPOOL 64
#define MIN_BITPOOL 2

#define MPEG_CHANNEL_MODE_MONO (1 << 3)
#define MPEG_CHANNEL_MODE_DUAL_CHANNEL (1 << 2)
#define MPEG_CHANNEL_MODE_STEREO (1 << 1)
#define MPEG_CHANNEL_MODE_JOINT_STEREO 1

#define MPEG_LAYER_MP1 (1 << 2)
#define MPEG_LAYER_MP2 (1 << 1)
#define MPEG_LAYER_MP3 1

#define MPEG_SAMPLING_FREQ_16000 (1 << 5)
#define MPEG_SAMPLING_FREQ_22050 (1 << 4)
#define MPEG_SAMPLING_FREQ_24000 (1 << 3)
#define MPEG_SAMPLING_FREQ_32000 (1 << 2)
#define MPEG_SAMPLING_FREQ_44100 (1 << 1)
#define MPEG_SAMPLING_FREQ_48000 1

#define MPEG_BIT_RATE_VBR 0x8000
#define MPEG_BIT_RATE_320000 0x4000
#define MPEG_BIT_RATE_256000 0x2000
#define MPEG_BIT_RATE_224000 0x1000
#define MPEG_BIT_RATE_192000 0x0800
#define MPEG_BIT_RATE_160000 0x0400
#define MPEG_BIT_RATE_128000 0x0200
#define MPEG_BIT_RATE_112000 0x0100
#define MPEG_BIT_RATE_96000 0x0080
#define MPEG_BIT_RATE_80000 0x0040
#define MPEG_BIT_RATE_64000 0x0020
#define MPEG_BIT_RATE_56000 0x0010
#define MPEG_BIT_RATE_48000 0x0008
#define MPEG_BIT_RATE_40000 0x0004
#define MPEG_BIT_RATE_32000 0x0002
#define MPEG_BIT_RATE_FREE 0x0001

#if __BYTE_ORDER == __LITTLE_ENDIAN

typedef struct {
	uint8_t channel_mode : 4;
	uint8_t frequency : 4;
	uint8_t allocation_method : 2;
	uint8_t subbands : 2;
	uint8_t block_length : 4;
	uint8_t min_bitpool;
	uint8_t max_bitpool;
} __attribute__((packed)) a2dp_sbc_t;

typedef struct {
	uint8_t channel_mode : 4;
	uint8_t crc : 1;
	uint8_t layer : 3;
	uint8_t frequency : 6;
	uint8_t mpf : 1;
	uint8_t rfa : 1;
	uint16_t bitrate;
} __attribute__((packed)) a2dp_mpeg_t;

#elif __BYTE_ORDER == __BIG_ENDIAN

typedef struct {
	uint8_t frequency : 4;
	uint8_t channel_mode : 4;
	uint8_t block_length : 4;
	uint8_t subbands : 2;
	uint8_t allocation_method : 2;
	uint8_t min_bitpool;
	uint8_t max_bitpool;
} __attribute__((packed)) a2dp_sbc_t;

typedef struct {
	uint8_t layer : 3;
	uint8_t crc : 1;
	uint8_t channel_mode : 4;
	uint8_t rfa : 1;
	uint8_t mpf : 1;
	uint8_t frequency : 6;
	uint16_t bitrate;
} __attribute__((packed)) a2dp_mpeg_t;

#else
#error "Unknown byte order"
#endif

typedef struct {
	uint8_t vendor_id[4];
	uint8_t codec_id[2];
} __attribute__((packed)) a2dp_vendor_codec_t;