pipewire/spa/plugins/bluez5/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
 *
 */

#ifndef BLUEALSA_A2DPCODECS_H_
#define BLUEALSA_A2DPCODECS_H_

#include <stdint.h>

#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

/* customized 16-bit vendor extension */
#define A2DP_CODEC_VENDOR_APTX		0x4FFF
#define A2DP_CODEC_VENDOR_LDAC		0x2DFF

#define SBC_SAMPLING_FREQ_48000		(1 << 0)
#define SBC_SAMPLING_FREQ_44100		(1 << 1)
#define SBC_SAMPLING_FREQ_32000		(1 << 2)
#define SBC_SAMPLING_FREQ_16000		(1 << 3)

#define SBC_CHANNEL_MODE_JOINT_STEREO	(1 << 0)
#define SBC_CHANNEL_MODE_STEREO		(1 << 1)
#define SBC_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
#define SBC_CHANNEL_MODE_MONO		(1 << 3)

#define SBC_BLOCK_LENGTH_16		(1 << 0)
#define SBC_BLOCK_LENGTH_12		(1 << 1)
#define SBC_BLOCK_LENGTH_8		(1 << 2)
#define SBC_BLOCK_LENGTH_4		(1 << 3)

#define SBC_SUBBANDS_8			(1 << 0)
#define SBC_SUBBANDS_4			(1 << 1)

#define SBC_ALLOCATION_LOUDNESS		(1 << 0)
#define SBC_ALLOCATION_SNR		(1 << 1)

#define MIN_BITPOOL 2
#define MAX_BITPOOL 64

#define MPEG_CHANNEL_MODE_JOINT_STEREO	(1 << 0)
#define MPEG_CHANNEL_MODE_STEREO	(1 << 1)
#define MPEG_CHANNEL_MODE_DUAL_CHANNEL	(1 << 2)
#define MPEG_CHANNEL_MODE_MONO		(1 << 3)

#define MPEG_LAYER_MP3			(1 << 0)
#define MPEG_LAYER_MP2			(1 << 1)
#define MPEG_LAYER_MP1			(1 << 2)

#define MPEG_SAMPLING_FREQ_48000	(1 << 0)
#define MPEG_SAMPLING_FREQ_44100	(1 << 1)
#define MPEG_SAMPLING_FREQ_32000	(1 << 2)
#define MPEG_SAMPLING_FREQ_24000	(1 << 3)
#define MPEG_SAMPLING_FREQ_22050	(1 << 4)
#define MPEG_SAMPLING_FREQ_16000	(1 << 5)

#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

#define AAC_OBJECT_TYPE_MPEG2_AAC_LC	0x80
#define AAC_OBJECT_TYPE_MPEG4_AAC_LC	0x40
#define AAC_OBJECT_TYPE_MPEG4_AAC_LTP	0x20
#define AAC_OBJECT_TYPE_MPEG4_AAC_SCA	0x10

#define AAC_SAMPLING_FREQ_8000		0x0800
#define AAC_SAMPLING_FREQ_11025		0x0400
#define AAC_SAMPLING_FREQ_12000		0x0200
#define AAC_SAMPLING_FREQ_16000		0x0100
#define AAC_SAMPLING_FREQ_22050		0x0080
#define AAC_SAMPLING_FREQ_24000		0x0040
#define AAC_SAMPLING_FREQ_32000		0x0020
#define AAC_SAMPLING_FREQ_44100		0x0010
#define AAC_SAMPLING_FREQ_48000		0x0008
#define AAC_SAMPLING_FREQ_64000		0x0004
#define AAC_SAMPLING_FREQ_88200		0x0002
#define AAC_SAMPLING_FREQ_96000		0x0001

#define AAC_CHANNELS_1			0x02
#define AAC_CHANNELS_2			0x01

#define AAC_GET_BITRATE(a) ((a).bitrate1 << 16 | \
					(a).bitrate2 << 8 | (a).bitrate3)
#define AAC_GET_FREQUENCY(a) ((a).frequency1 << 4 | (a).frequency2)

#define AAC_SET_BITRATE(a, b) \
	do { \
		(a).bitrate1 = ((b) >> 16) & 0x7f; \
		(a).bitrate2 = ((b) >> 8) & 0xff; \
		(a).bitrate3 = (b) & 0xff; \
	} while (0)
#define AAC_SET_FREQUENCY(a, f) \
	do { \
		(a).frequency1 = ((f) >> 4) & 0xff; \
		(a).frequency2 = (f) & 0x0f; \
	} while (0)

#define AAC_INIT_BITRATE(b) \
	.bitrate1 = ((b) >> 16) & 0x7f, \
	.bitrate2 = ((b) >> 8) & 0xff, \
	.bitrate3 = (b) & 0xff,
#define AAC_INIT_FREQUENCY(f) \
	.frequency1 = ((f) >> 4) & 0xff, \
	.frequency2 = (f) & 0x0f,

#define APTX_VENDOR_ID			0x0000004f
#define APTX_CODEC_ID			0x0001

#define APTX_CHANNEL_MODE_MONO		0x08
#define APTX_CHANNEL_MODE_DUAL_CHANNEL	0x04
#define APTX_CHANNEL_MODE_STEREO	0x02
#define APTX_CHANNEL_MODE_JOINT_STEREO	0x01

#define APTX_SAMPLING_FREQ_16000	0x08
#define APTX_SAMPLING_FREQ_32000	0x04
#define APTX_SAMPLING_FREQ_44100	0x02
#define APTX_SAMPLING_FREQ_48000	0x01

#define LDAC_VENDOR_ID			0x0000012d
#define LDAC_CODEC_ID			0x00aa

typedef struct {
	uint32_t vendor_id;
	uint16_t codec_id;
} __attribute__ ((packed)) a2dp_vendor_codec_t;

#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;

typedef struct {
	uint8_t object_type;
	uint8_t frequency1;
	uint8_t rfa:2;
	uint8_t channels:2;
	uint8_t frequency2:4;
	uint8_t bitrate1:7;
	uint8_t vbr:1;
	uint8_t bitrate2;
	uint8_t bitrate3;
} __attribute__ ((packed)) a2dp_aac_t;

typedef struct {
	a2dp_vendor_codec_t info;
	uint8_t channel_mode:4;
	uint8_t frequency:4;
} __attribute__ ((packed)) a2dp_aptx_t;

typedef struct {
	a2dp_vendor_codec_t info;
	uint8_t unknown[2];
} __attribute__ ((packed)) a2dp_ldac_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;

typedef struct {
	uint8_t object_type;
	uint8_t frequency1;
	uint8_t frequency2:4;
	uint8_t channels:2;
	uint8_t rfa:2;
	uint8_t vbr:1;
	uint8_t bitrate1:7;
	uint8_t bitrate2;
	uint8_t bitrate3;
} __attribute__ ((packed)) a2dp_aac_t;

typedef struct {
	a2dp_vendor_codec_t info;
	uint8_t frequency:4;
	uint8_t channel_mode:4;
} __attribute__ ((packed)) a2dp_aptx_t;

typedef struct {
	a2dp_vendor_codec_t info;
	uint8_t unknown[2];
} __attribute__ ((packed)) a2dp_ldac_t;

#else
#error "Unknown byte order"
#endif

static inline int a2dp_sbc_get_channels(a2dp_sbc_t *config)
{
	switch (config->channel_mode) {
	case SBC_CHANNEL_MODE_MONO:
                return 1;
	case SBC_CHANNEL_MODE_DUAL_CHANNEL:
	case SBC_CHANNEL_MODE_STEREO:
	case SBC_CHANNEL_MODE_JOINT_STEREO:
                return 2;
	default:
                return -1;
        }
}

static inline int a2dp_sbc_get_frequency(a2dp_sbc_t *config)
{
	switch (config->frequency) {
	case SBC_SAMPLING_FREQ_16000:
                return 16000;
	case SBC_SAMPLING_FREQ_32000:
                return 32000;
	case SBC_SAMPLING_FREQ_44100:
                return 44100;
	case SBC_SAMPLING_FREQ_48000:
                return 48000;
	default:
                return -1;
        }
}

const a2dp_sbc_t bluez_a2dp_sbc;
#if ENABLE_MP3
const a2dp_mpeg_t bluez_a2dp_mpeg;
#endif
#if ENABLE_AAC
const a2dp_aac_t bluez_a2dp_aac;
#endif
#if ENABLE_APTX
const a2dp_aptx_t bluez_a2dp_aptx;
#endif

#endif