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/* |
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* a52_internal.h |
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* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org> |
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* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca> |
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* |
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* This file is part of a52dec, a free ATSC A-52 stream decoder. |
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* See http://liba52.sourceforge.net/ for updates. |
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* |
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* a52dec is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* a52dec is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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typedef struct { |
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uint8_t bai; /* fine SNR offset, fast gain */ |
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uint8_t deltbae; /* delta bit allocation exists */ |
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int8_t deltba[50]; /* per-band delta bit allocation */ |
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} ba_t; |
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|
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typedef struct { |
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uint8_t exp[256]; /* decoded channel exponents */ |
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int8_t bap[256]; /* derived channel bit allocation */ |
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} expbap_t; |
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|
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struct a52_state_s { |
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uint8_t fscod; /* sample rate */ |
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uint8_t halfrate; /* halfrate factor */ |
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uint8_t acmod; /* coded channels */ |
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uint8_t lfeon; /* coded lfe channel */ |
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sample_t clev; /* centre channel mix level */ |
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sample_t slev; /* surround channels mix level */ |
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|
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int output; /* type of output */ |
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sample_t level; /* output level */ |
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sample_t bias; /* output bias */ |
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|
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int dynrnge; /* apply dynamic range */ |
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sample_t dynrng; /* dynamic range */ |
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void * dynrngdata; /* dynamic range callback funtion and data */ |
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sample_t (* dynrngcall) (sample_t range, void * dynrngdata); |
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|
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uint8_t chincpl; /* channel coupled */ |
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uint8_t phsflginu; /* phase flags in use (stereo only) */ |
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uint8_t cplstrtmant; /* coupling channel start mantissa */ |
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uint8_t cplendmant; /* coupling channel end mantissa */ |
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uint32_t cplbndstrc; /* coupling band structure */ |
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sample_t cplco[5][18]; /* coupling coordinates */ |
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|
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/* derived information */ |
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uint8_t cplstrtbnd; /* coupling start band (for bit allocation) */ |
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uint8_t ncplbnd; /* number of coupling bands */ |
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|
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uint8_t rematflg; /* stereo rematrixing */ |
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|
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uint8_t endmant[5]; /* channel end mantissa */ |
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|
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uint16_t bai; /* bit allocation information */ |
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|
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uint32_t * buffer_start; |
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uint16_t lfsr_state; /* dither state */ |
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uint32_t bits_left; |
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uint32_t current_word; |
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|
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uint8_t csnroffst; /* coarse SNR offset */ |
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ba_t cplba; /* coupling bit allocation parameters */ |
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ba_t ba[5]; /* channel bit allocation parameters */ |
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ba_t lfeba; /* lfe bit allocation parameters */ |
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|
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uint8_t cplfleak; /* coupling fast leak init */ |
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uint8_t cplsleak; /* coupling slow leak init */ |
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|
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expbap_t cpl_expbap; |
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expbap_t fbw_expbap[5]; |
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expbap_t lfe_expbap; |
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|
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sample_t * samples; |
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int downmixed; |
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}; |
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|
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// [Air]: Added sample_t casts here. |
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// Improves SSE2 optimization efficiency under Visual Studio 2008 |
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|
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#define LEVEL_PLUS6DB ((sample_t)2.0) |
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#define LEVEL_PLUS3DB ((sample_t)1.4142135623730951) |
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#define LEVEL_3DB ((sample_t)0.7071067811865476) |
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#define LEVEL_45DB ((sample_t)0.5946035575013605) |
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#define LEVEL_6DB ((sample_t)0.5) |
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|
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#define EXP_REUSE (0) |
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#define EXP_D15 (1) |
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#define EXP_D25 (2) |
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#define EXP_D45 (3) |
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|
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#define DELTA_BIT_REUSE (0) |
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#define DELTA_BIT_NEW (1) |
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#define DELTA_BIT_NONE (2) |
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#define DELTA_BIT_RESERVED (3) |
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|
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void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart, |
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int start, int end, int fastleak, int slowleak, |
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expbap_t * expbap); |
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|
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int a52_downmix_init (int input, int flags, sample_t * level, |
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sample_t clev, sample_t slev); |
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int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level, |
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sample_t clev, sample_t slev); |
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void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias, |
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sample_t clev, sample_t slev); |
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void a52_upmix (sample_t * samples, int acmod, int output); |
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|
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void a52_imdct_init (uint32_t mm_accel); |
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void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias); |
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void a52_imdct_512 (sample_t * data, sample_t * delay, sample_t bias); |
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