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Diffstat (limited to 'liba52/a52.h')
| -rw-r--r-- | liba52/a52.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/liba52/a52.h b/liba52/a52.h new file mode 100644 index 0000000000..bf63fc68d6 --- /dev/null +++ b/liba52/a52.h @@ -0,0 +1,122 @@ +/* + * 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); + +#endif /* A52_H */ |