/* * a52_internal.h * Copyright (C) 2000-2003 Michel Lespinasse * Copyright (C) 1999-2000 Aaron Holtzman * * 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 */ 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 */ level_t clev; /* centre channel mix level */ level_t slev; /* surround channels mix level */ int output; /* type of output */ level_t level; /* output level */ sample_t bias; /* output bias */ int dynrnge; /* apply dynamic range */ level_t dynrng; /* dynamic range */ void * dynrngdata; /* dynamic range callback funtion and data */ level_t (* dynrngcall) (level_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 */ level_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; int downmixed; }; #define LEVEL_PLUS6DB 2.0 #define LEVEL_PLUS3DB 1.4142135623730951 #define LEVEL_3DB 0.7071067811865476 #define LEVEL_45DB 0.5946035575013605 #define LEVEL_6DB 0.5 #define EXP_REUSE (0) #define EXP_D15 (1) #define EXP_D25 (2) #define EXP_D45 (3) #define DELTA_BIT_REUSE (0) #define DELTA_BIT_NEW (1) #define DELTA_BIT_NONE (2) #define DELTA_BIT_RESERVED (3) 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 a52_downmix_init (int input, int flags, level_t * level, level_t clev, level_t slev); int a52_downmix_coeff (level_t * coeff, int acmod, int output, level_t level, level_t clev, level_t slev); void a52_downmix (sample_t * samples, int acmod, int output, sample_t bias, level_t clev, level_t slev); 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); #define ROUND(x) ((int)((x) + ((x) > 0 ? 0.5 : -0.5))) #ifndef LIBA52_FIXED typedef sample_t quantizer_t; #define SAMPLE(x) (x) #define LEVEL(x) (x) #define MUL(a,b) ((a) * (b)) #define MUL_L(a,b) ((a) * (b)) #define MUL_C(a,b) ((a) * (b)) #define DIV(a,b) ((a) / (b)) #define BIAS(x) ((x) + bias) #else /* LIBA52_FIXED */ typedef int16_t quantizer_t; #define SAMPLE(x) (sample_t)((x) * (1 << 30)) #define LEVEL(x) (level_t)((x) * (1 << 26)) #if 0 #define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30)) #define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26)) #elif CONFIG_CPU==MCF5249 && !defined(SIMULATOR) /* loses 1 bit of accuracy */ #define MUL(a, b) \ ({ \ int32_t t; \ asm volatile ( \ "mac.l %[A], %[B], %%acc0\n\t" \ "movclr.l %%acc0, %[t]\n\t" \ "asl.l #1, %[t]" \ : [t] "=d" (t) \ : [A] "r" ((a)), [B] "r" ((b))); \ t; \ }) /* loses 5 bits of accuracy */ #define MUL_L(a, b) \ ({ \ int32_t t; \ asm volatile ( \ "mac.l %[A], %[B], %%acc0\n\t" \ "movclr.l %%acc0, %[t]\n\t" \ "asl.l #5, %[t]" \ : [t] "=d" (t) \ : [A] "r" ((a)), [B] "r" ((b))); \ t; \ }) #elif 1 #define MUL(a,b) \ ({ int32_t _ta=(a), _tb=(b), _tc; \ _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)(((_tc >> 14))+ (((_ta >> 16)*(_tb >> 16)) << 2 )); }) #define MUL_L(a,b) \ ({ int32_t _ta=(a), _tb=(b), _tc; \ _tc=(_ta & 0xffff)*(_tb >> 16)+(_ta >> 16)*(_tb & 0xffff); (int32_t)((_tc >> 10) + (((_ta >> 16)*(_tb >> 16)) << 6)); }) #else #define MUL(a,b) (((a) >> 15) * ((b) >> 15)) #define MUL_L(a,b) (((a) >> 13) * ((b) >> 13)) #endif #define MUL_C(a,b) MUL_L (a, LEVEL (b)) #define DIV(a,b) ((((int64_t)LEVEL (a)) << 26) / (b)) #define BIAS(x) ((x) + (bias*0)) #endif