liba52/a52_internal.h

   1 /*
   2  * a52_internal.h
   3  * Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
   4  * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   5  *
   6  * This file is part of a52dec, a free ATSC A-52 stream decoder.
   7  * See http://liba52.sourceforge.net/ for updates.
   8  *
   9  * Modified for use with MPlayer, changes contained in liba52_changes.diff.
  10  * detailed changelog at http://svn.mplayerhq.hu/mplayer/trunk/
  11  * $Id$
  12  *
  13  * a52dec is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * a52dec is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26  */
  27
  28 typedef struct {
  29     uint8_t bai;                /* fine SNR offset, fast gain */
  30     uint8_t deltbae;            /* delta bit allocation exists */
  31     int8_t deltba[50];          /* per-band delta bit allocation */
  32 } ba_t;
  33
  34 typedef struct {
  35     uint8_t exp[256];           /* decoded channel exponents */
  36     int8_t bap[256];            /* derived channel bit allocation */
  37 } expbap_t;
  38
  39 struct a52_state_s {
  40     uint8_t fscod;              /* sample rate */
  41     uint8_t halfrate;           /* halfrate factor */
  42     uint8_t acmod;              /* coded channels */
  43     uint8_t lfeon;              /* coded lfe channel */
  44     sample_t clev;              /* centre channel mix level */
  45     sample_t slev;              /* surround channels mix level */
  46
  47     int output;                 /* type of output */
  48     sample_t level;             /* output level */
  49     sample_t bias;              /* output bias */
  50
  51     int dynrnge;                /* apply dynamic range */
  52     sample_t dynrng;            /* dynamic range */
  53     void * dynrngdata;          /* dynamic range callback funtion and data */
  54     sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
  55
  56     uint8_t chincpl;            /* channel coupled */
  57     uint8_t phsflginu;          /* phase flags in use (stereo only) */
  58     uint8_t cplstrtmant;        /* coupling channel start mantissa */
  59     uint8_t cplendmant;         /* coupling channel end mantissa */
  60     uint32_t cplbndstrc;        /* coupling band structure */
  61     sample_t cplco[5][18];      /* coupling coordinates */
  62
  63     /* derived information */
  64     uint8_t cplstrtbnd;         /* coupling start band (for bit allocation) */
  65     uint8_t ncplbnd;            /* number of coupling bands */
  66
  67     uint8_t rematflg;           /* stereo rematrixing */
  68
  69     uint8_t endmant[5];         /* channel end mantissa */
  70
  71     uint16_t bai;               /* bit allocation information */
  72
  73     uint32_t * buffer_start;
  74     uint16_t lfsr_state;        /* dither state */
  75     uint32_t bits_left;
  76     uint32_t current_word;
  77
  78     uint8_t csnroffst;          /* coarse SNR offset */
  79     ba_t cplba;                 /* coupling bit allocation parameters */
  80     ba_t ba[5];                 /* channel bit allocation parameters */
  81     ba_t lfeba;                 /* lfe bit allocation parameters */
  82
  83     uint8_t cplfleak;           /* coupling fast leak init */
  84     uint8_t cplsleak;           /* coupling slow leak init */
  85
  86     expbap_t cpl_expbap;
  87     expbap_t fbw_expbap[5];
  88     expbap_t lfe_expbap;
  89
  90     sample_t * samples;
  91     int downmixed;
  92 };
  93
  94 #define LEVEL_PLUS6DB 2.0
  95 #define LEVEL_PLUS3DB 1.4142135623730951
  96 #define LEVEL_3DB 0.7071067811865476
  97 #define LEVEL_45DB 0.5946035575013605
  98 #define LEVEL_6DB 0.5
  99
 100 #define EXP_REUSE (0)
 101 #define EXP_D15   (1)
 102 #define EXP_D25   (2)
 103 #define EXP_D45   (3)
 104
 105 #define DELTA_BIT_REUSE (0)
 106 #define DELTA_BIT_NEW (1)
 107 #define DELTA_BIT_NONE (2)
 108 #define DELTA_BIT_RESERVED (3)
 109
 110 #if ARCH_X86_64
 111 # define REG_a "rax"
 112 # define REG_d "rdx"
 113 # define REG_S "rsi"
 114 # define REG_D "rdi"
 115 # define REG_BP "rbp"
 116 #else
 117 # define REG_a "eax"
 118 # define REG_d "edx"
 119 # define REG_S "esi"
 120 # define REG_D "edi"
 121 # define REG_BP "ebp"
 122 #endif
 123
 124 void a52_bit_allocate (a52_state_t * state, ba_t * ba, int bndstart,
 125                        int start, int end, int fastleak, int slowleak,
 126                        expbap_t * expbap);
 127
 128 int a52_downmix_init (int input, int flags, sample_t * level,
 129                       sample_t clev, sample_t slev);
 130 void downmix_accel_init(uint32_t mm_accel);
 131 int a52_downmix_coeff (sample_t * coeff, int acmod, int output, sample_t level,
 132                        sample_t clev, sample_t slev);
 133 extern void (*a52_downmix) (sample_t * samples, int acmod, int output, sample_t bias,
 134                   sample_t clev, sample_t slev);
 135 extern void (*a52_upmix) (sample_t * samples, int acmod, int output);
 136
 137 void a52_imdct_init (uint32_t mm_accel);
 138 void a52_imdct_256 (sample_t * data, sample_t * delay, sample_t bias);
 139 extern void (*a52_imdct_512) (sample_t * data, sample_t * delay, sample_t bias);
 140 void imdct_do_512 (sample_t * data, sample_t * delay, sample_t bias);