161 lines
5.3 KiB
C
161 lines
5.3 KiB
C
/*
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* a52_internal.h
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* Copyright (C) 2000-2003 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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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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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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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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level_t clev; /* centre channel mix level */
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level_t slev; /* surround channels mix level */
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int output; /* type of output */
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level_t level; /* output level */
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sample_t bias; /* output bias */
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int dynrnge; /* apply dynamic range */
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level_t dynrng; /* dynamic range */
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void * dynrngdata; /* dynamic range callback funtion and data */
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level_t (* dynrngcall) (level_t range, void * dynrngdata);
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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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level_t cplco[5][18]; /* coupling coordinates */
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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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uint8_t rematflg; /* stereo rematrixing */
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uint8_t endmant[5]; /* channel end mantissa */
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uint16_t bai; /* bit allocation information */
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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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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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uint8_t cplfleak; /* coupling fast leak init */
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uint8_t cplsleak; /* coupling slow leak init */
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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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sample_t * samples;
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int downmixed;
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};
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#define LEVEL_PLUS6DB 2.0
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#define LEVEL_PLUS3DB 1.4142135623730951
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#define LEVEL_3DB 0.7071067811865476
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#define LEVEL_45DB 0.5946035575013605
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#define LEVEL_6DB 0.5
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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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#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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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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int a52_downmix_init (int input, int flags, level_t * level,
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level_t clev, level_t slev);
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int a52_downmix_coeff (level_t * coeff, int acmod, int output, level_t level,
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level_t clev, level_t slev);
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void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias,
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level_t clev, level_t slev);
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void a52_upmix (sample_t * samples, int acmod, int output);
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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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#define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5)))
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#ifndef LIBA52_FIXED
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typedef sample_t quantizer_t;
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#define SAMPLE(x) (x)
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#define LEVEL(x) (x)
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#define MUL(a,b) ((a) * (b))
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#define MUL_L(a,b) ((a) * (b))
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#define MUL_C(a,b) ((a) * (b))
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#define DIV(a,b) ((a) / (b))
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#define BIAS(x) ((x) + bias)
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#else /* LIBA52_FIXED */
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typedef int16_t quantizer_t;
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#define SAMPLE(x) (sample_t)((x) * (1 << 30))
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#define LEVEL(x) (level_t)((x) * (1 << 26))
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#if 0
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#define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30))
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#define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26))
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#elif 1
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#define MUL(a,b) \
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({ int32_t _ta=(a), _tb=(b), _tc; \
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_tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)(((_tc >> 14))+ (((_ta >> 16)*(_tb >> 16)) << 2 )); })
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#define MUL_L(a,b) \
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({ int32_t _ta=(a), _tb=(b), _tc; \
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_tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)((_tc >> 10) + (((_ta >> 16)*(_tb >> 16)) << 6)); })
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#else
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#define MUL(a,b) (((a) >> 15) * ((b) >> 15))
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#define MUL_L(a,b) (((a) >> 13) * ((b) >> 13))
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#endif
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#define MUL_C(a,b) MUL_L (a, LEVEL (b))
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#define DIV(a,b) ((((int64_t)LEVEL (a)) << 26) / (b))
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#define BIAS(x) (x)
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#endif
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