diff options
Diffstat (limited to 'src/liba52/a52_internal.h')
| -rw-r--r-- | src/liba52/a52_internal.h | 99 |
1 files changed, 83 insertions, 16 deletions
diff --git a/src/liba52/a52_internal.h b/src/liba52/a52_internal.h index a1b88c229..541d94803 100644 --- a/src/liba52/a52_internal.h +++ b/src/liba52/a52_internal.h @@ -1,8 +1,10 @@ /* * a52_internal.h - * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> + * Copyright (C) 2000-2002 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 @@ -19,6 +21,73 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +typedef struct { + uint8_t bai; /* fine SNR offset, fast gain */ + uint8_t deltbae; /* delta bit allocation exists */ + int8_t deltba[50]; /* per-band delta bit allocation */ +} ba_t; + +typedef struct { + uint8_t exp[256]; /* decoded channel exponents */ + int8_t bap[256]; /* derived channel bit allocation */ +} expbap_t; + +struct a52_state_s { + uint8_t fscod; /* sample rate */ + uint8_t halfrate; /* halfrate factor */ + uint8_t acmod; /* coded channels */ + uint8_t lfeon; /* coded lfe channel */ + sample_t clev; /* centre channel mix level */ + sample_t slev; /* surround channels mix level */ + + 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); + + uint8_t chincpl; /* channel coupled */ + uint8_t phsflginu; /* phase flags in use (stereo only) */ + uint8_t cplstrtmant; /* coupling channel start mantissa */ + uint8_t cplendmant; /* coupling channel end mantissa */ + uint32_t cplbndstrc; /* coupling band structure */ + sample_t cplco[5][18]; /* coupling coordinates */ + + /* derived information */ + uint8_t cplstrtbnd; /* coupling start band (for bit allocation) */ + uint8_t ncplbnd; /* number of coupling bands */ + + uint8_t rematflg; /* stereo rematrixing */ + + uint8_t endmant[5]; /* channel end mantissa */ + + uint16_t bai; /* bit allocation information */ + + uint32_t * buffer_start; + uint16_t lfsr_state; /* dither state */ + uint32_t bits_left; + uint32_t current_word; + + uint8_t csnroffst; /* coarse SNR offset */ + ba_t cplba; /* coupling bit allocation parameters */ + ba_t ba[5]; /* channel bit allocation parameters */ + ba_t lfeba; /* lfe bit allocation parameters */ + + uint8_t cplfleak; /* coupling fast leak init */ + uint8_t cplsleak; /* coupling slow leak init */ + + expbap_t cpl_expbap; + expbap_t fbw_expbap[5]; + expbap_t lfe_expbap; + + sample_t * samples; + void * samples_base; + int downmixed; +}; + #define LEVEL_PLUS6DB 2.0 #define LEVEL_PLUS3DB 1.4142135623730951 #define LEVEL_3DB 0.7071067811865476 @@ -35,20 +104,18 @@ #define DELTA_BIT_NONE (2) #define DELTA_BIT_RESERVED (3) -void bit_allocate (a52_state_t * state, a52_ba_t * ba, int bndstart, - int start, int end, int fastleak, int slowleak, - uint8_t * exp, int8_t * bap); +void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart, + int start, int end, int fastleak, int slowleak, + expbap_t * expbap); -int downmix_init (int input, int flags, sample_t * level, +int a52_downmix_init (int input, int flags, sample_t * level, + sample_t clev, sample_t slev); +int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level, + sample_t clev, sample_t slev); +void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias, sample_t clev, sample_t slev); -int downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level, - sample_t clev, sample_t slev); -void downmix (sample_t * samples, int acmod, int output, sample_t bias, - sample_t clev, sample_t slev); -void upmix (sample_t * samples, int acmod, int output); - -void imdct_init (uint32_t mm_accel); -extern void (* imdct_256) (sample_t * data, sample_t * delay, sample_t bias); -extern void (* imdct_512) (sample_t * data, sample_t * delay, sample_t bias); -void imdct_do_256_mlib (sample_t * data, sample_t * delay, sample_t bias); -void imdct_do_512_mlib (sample_t * data, sample_t * delay, sample_t bias); +void a52_upmix (sample_t * samples, int acmod, int output); + +void a52_imdct_init (uint32_t mm_accel); +void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias); +void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias); |