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/*
* a52.h
* Copyright (C) 2000-2001 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of a52dec, a free ATSC A-52 stream decoder.
* See http://liba52.sourceforge.net/ for updates.
*
* a52dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* a52dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef A52_H
#define A52_H
#ifndef LIBA52_DOUBLE
typedef float sample_t;
#else
typedef double sample_t;
#endif
typedef struct a52_ba_s {
uint16_t fsnroffst; /* fine SNR offset */
uint16_t fgaincod; /* fast gain */
uint16_t deltbae; /* delta bit allocation exists */
int8_t deltba[50]; /* per-band delta bit allocation */
} a52_ba_t;
typedef struct a52_state_s {
uint8_t fscod; /* sample rate */
uint8_t halfrate; /* halfrate factor */
uint8_t acmod; /* coded channels */
sample_t clev; /* centre channel mix level */
sample_t slev; /* surround channels mix level */
uint8_t lfeon; /* coded lfe channel */
int output; /* type of output */
sample_t level; /* output level */
sample_t bias; /* output bias */
int dynrnge; /* apply dynamic range */
sample_t dynrng; /* dynamic range */
void * dynrngdata; /* dynamic range callback funtion and data */
sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
uint16_t cplinu; /* coupling in use */
uint16_t chincpl[5]; /* channel coupled */
uint16_t phsflginu; /* phase flags in use (stereo only) */
uint16_t cplbndstrc[18]; /* coupling band structure */
uint16_t cplstrtmant; /* coupling channel start mantissa */
uint16_t cplendmant; /* coupling channel end mantissa */
sample_t cplco[5][18]; /* coupling coordinates */
/* derived information */
uint16_t cplstrtbnd; /* coupling start band (for bit allocation) */
uint16_t ncplbnd; /* number of coupling bands */
uint16_t rematflg[4]; /* stereo rematrixing */
uint16_t endmant[5]; /* channel end mantissa */
uint8_t cpl_exp[256]; /* decoded coupling channel exponents */
uint8_t fbw_exp[5][256]; /* decoded channel exponents */
uint8_t lfe_exp[7]; /* decoded lfe channel exponents */
uint16_t sdcycod; /* slow decay */
uint16_t fdcycod; /* fast decay */
uint16_t sgaincod; /* slow gain */
uint16_t dbpbcod; /* dB per bit - encodes the dbknee value */
uint16_t floorcod; /* masking floor */
uint16_t csnroffst; /* coarse SNR offset */
a52_ba_t cplba; /* coupling bit allocation parameters */
a52_ba_t ba[5]; /* channel bit allocation parameters */
a52_ba_t lfeba; /* lfe bit allocation parameters */
uint16_t cplfleak; /* coupling fast leak init */
uint16_t cplsleak; /* coupling slow leak init */
/* derived bit allocation information */
int8_t fbw_bap[5][256];
int8_t cpl_bap[256];
int8_t lfe_bap[7];
} a52_state_t;
#define A52_CHANNEL 0
#define A52_MONO 1
#define A52_STEREO 2
#define A52_3F 3
#define A52_2F1R 4
#define A52_3F1R 5
#define A52_2F2R 6
#define A52_3F2R 7
#define A52_CHANNEL1 8
#define A52_CHANNEL2 9
#define A52_DOLBY 10
#define A52_CHANNEL_MASK 15
#define A52_LFE 16
#define A52_ADJUST_LEVEL 32
sample_t * a52_init (uint32_t mm_accel);
int a52_syncinfo (uint8_t * buf, int * flags,
int * sample_rate, int * bit_rate);
int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
sample_t * level, sample_t bias);
void a52_dynrng (a52_state_t * state,
sample_t (* call) (sample_t, void *), void * data);
int a52_block (a52_state_t * state, sample_t * samples);
void a52_resample_init(uint32_t mm_accel,int _flags,int _chans);
extern int (* a52_resample) (float * _f, int16_t * s16);
uint16_t crc16_block(uint8_t *data,uint32_t num_bytes);
#endif /* A52_H */
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