EC600G/components/audio/include/sbc.h

/*
 *
 *  Bluetooth low-complexity, subband codec (SBC) library
 *
 *  Copyright (C) 2008-2010  Nokia Corporation
 *  Copyright (C) 2012-2014  Intel Corporation
 *  Copyright (C) 2004-2010  Marcel Holtmann <marcel@holtmann.org>
 *  Copyright (C) 2004-2005  Henryk Ploetz <henryk@ploetzli.ch>
 *  Copyright (C) 2005-2006  Brad Midgley <bmidgley@xmission.com>
 *
 *
 *  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 __SBC_H
#define __SBC_H

#ifdef __cplusplus
extern "C" {
#endif

#include <stdint.h>
#include <sys/types.h>

/* sampling frequency */
#define SBC_FREQ_16000		0x00
#define SBC_FREQ_32000		0x01
#define SBC_FREQ_44100		0x02
#define SBC_FREQ_48000		0x03

/* blocks */
#define SBC_BLK_4		0x00
#define SBC_BLK_8		0x01
#define SBC_BLK_12		0x02
#define SBC_BLK_16		0x03

/* channel mode */
#define SBC_MODE_MONO		0x00
#define SBC_MODE_DUAL_CHANNEL	0x01
#define SBC_MODE_STEREO		0x02
#define SBC_MODE_JOINT_STEREO	0x03

/* allocation method */
#define SBC_AM_LOUDNESS		0x00
#define SBC_AM_SNR		0x01

/* subbands */
#define SBC_SB_4		0x00
#define SBC_SB_8		0x01

/* data endianess */
#define SBC_LE			0x00
#define SBC_BE			0x01

#define SBC_SYNCWORD	0x9C

#define MSBC_SYNCWORD	0xAD
#define MSBC_BLOCKS	15

#define A2DP_SAMPLING_FREQ_16000		(1 << 3)
#define A2DP_SAMPLING_FREQ_32000		(1 << 2)
#define A2DP_SAMPLING_FREQ_44100		(1 << 1)
#define A2DP_SAMPLING_FREQ_48000		(1 << 0)

#define A2DP_CHANNEL_MODE_MONO			(1 << 3)
#define A2DP_CHANNEL_MODE_DUAL_CHANNEL		(1 << 2)
#define A2DP_CHANNEL_MODE_STEREO		(1 << 1)
#define A2DP_CHANNEL_MODE_JOINT_STEREO		(1 << 0)

#define A2DP_BLOCK_LENGTH_4			(1 << 3)
#define A2DP_BLOCK_LENGTH_8			(1 << 2)
#define A2DP_BLOCK_LENGTH_12			(1 << 1)
#define A2DP_BLOCK_LENGTH_16			(1 << 0)

#define A2DP_SUBBANDS_4				(1 << 1)
#define A2DP_SUBBANDS_8				(1 << 0)

#define A2DP_ALLOCATION_SNR			(1 << 1)
#define A2DP_ALLOCATION_LOUDNESS		(1 << 0)

struct sbc_struct {
	unsigned long flags;

	uint8_t frequency;
	uint8_t blocks;
	uint8_t subbands;
	uint8_t mode;
	uint8_t allocation;
	uint8_t bitpool;
	uint8_t endian;

	void *priv;
	void *priv_alloc_base;
};

#if __BYTE_ORDER == __LITTLE_ENDIAN

struct a2dp_sbc {
	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));

#elif __BYTE_ORDER == __BIG_ENDIAN

struct a2dp_sbc {
	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));

#else
#error "Unknown byte order"
#endif

typedef struct sbc_struct sbc_t;
typedef struct a2dp_sbc a2dp_sbc_t;


int sbc_init(sbc_t *sbc, unsigned long flags);
int sbc_reinit(sbc_t *sbc, unsigned long flags);
int sbc_init_msbc(sbc_t *sbc, unsigned long flags);
int sbc_init_a2dp(sbc_t *sbc, unsigned long flags,
					const void *conf, size_t conf_len);
int sbc_reinit_a2dp(sbc_t *sbc, unsigned long flags,
					const void *conf, size_t conf_len);

ssize_t sbc_parse(sbc_t *sbc, const void *input, size_t input_len);

/* Decodes ONE input block into ONE output block */
ssize_t sbc_decode(sbc_t *sbc, const void *input, size_t input_len,
			void *output, size_t output_len, size_t *written);

/* Encodes ONE input block into ONE output block */
ssize_t sbc_encode(sbc_t *sbc, const void *input, size_t input_len,
			void *output, size_t output_len, ssize_t *written);

/* Returns the compressed block size in bytes */
size_t sbc_get_frame_length(sbc_t *sbc);

/* Returns the time one input/output block takes to play in msec*/
unsigned sbc_get_frame_duration(sbc_t *sbc);

/* Returns the uncompressed block size in bytes */
size_t sbc_get_codesize(sbc_t *sbc);

const char *sbc_get_implementation_info(sbc_t *sbc);
void sbc_finish(sbc_t *sbc);

#ifdef __cplusplus
}
#endif

#endif /* __SBC_H */