liba52/a52.h

   1 /*
   2  * a52.h
   3  * Copyright (C) 2000-2001 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 CVS changelog at http://www.mplayerhq.hu/cgi-bin/cvsweb.cgi/main/
  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 #ifndef A52_H
  29 #define A52_H
  30
  31 #ifndef LIBA52_DOUBLE
  32 typedef float sample_t;
  33 #else
  34 typedef double sample_t;
  35 #endif
  36
  37 typedef struct a52_ba_s {
  38     uint16_t fsnroffst;         /* fine SNR offset */
  39     uint16_t fgaincod;          /* fast gain */
  40     uint16_t deltbae;           /* delta bit allocation exists */
  41     int8_t deltba[50];          /* per-band delta bit allocation */
  42 } a52_ba_t;
  43
  44 typedef struct a52_state_s {
  45     uint8_t fscod;              /* sample rate */
  46     uint8_t halfrate;           /* halfrate factor */
  47     uint8_t acmod;              /* coded channels */
  48     sample_t clev;              /* centre channel mix level */
  49     sample_t slev;              /* surround channels mix level */
  50     uint8_t lfeon;              /* coded lfe channel */
  51
  52     int output;                 /* type of output */
  53     sample_t level;             /* output level */
  54     sample_t bias;              /* output bias */
  55
  56     int dynrnge;                /* apply dynamic range */
  57     sample_t dynrng;            /* dynamic range */
  58     void * dynrngdata;          /* dynamic range callback funtion and data */
  59     sample_t (* dynrngcall) (sample_t range, void * dynrngdata);
  60
  61     uint16_t cplinu;            /* coupling in use */
  62     uint16_t chincpl[5];        /* channel coupled */
  63     uint16_t phsflginu;         /* phase flags in use (stereo only) */
  64     uint16_t cplbndstrc[18];    /* coupling band structure */
  65     uint16_t cplstrtmant;       /* coupling channel start mantissa */
  66     uint16_t cplendmant;        /* coupling channel end mantissa */
  67     sample_t cplco[5][18];      /* coupling coordinates */
  68
  69     /* derived information */
  70     uint16_t cplstrtbnd;        /* coupling start band (for bit allocation) */
  71     uint16_t ncplbnd;           /* number of coupling bands */
  72
  73     uint16_t rematflg[4];       /* stereo rematrixing */
  74
  75     uint16_t endmant[5];        /* channel end mantissa */
  76
  77     uint8_t cpl_exp[256];       /* decoded coupling channel exponents */
  78     uint8_t fbw_exp[5][256];    /* decoded channel exponents */
  79     uint8_t lfe_exp[7];         /* decoded lfe channel exponents */
  80
  81     uint16_t sdcycod;           /* slow decay */
  82     uint16_t fdcycod;           /* fast decay */
  83     uint16_t sgaincod;          /* slow gain */
  84     uint16_t dbpbcod;           /* dB per bit - encodes the dbknee value */
  85     uint16_t floorcod;          /* masking floor */
  86
  87     uint16_t csnroffst;         /* coarse SNR offset */
  88     a52_ba_t cplba;             /* coupling bit allocation parameters */
  89     a52_ba_t ba[5];             /* channel bit allocation parameters */
  90     a52_ba_t lfeba;             /* lfe bit allocation parameters */
  91
  92     uint16_t cplfleak;          /* coupling fast leak init */
  93     uint16_t cplsleak;          /* coupling slow leak init */
  94
  95     /* derived bit allocation information */
  96     int8_t fbw_bap[5][256];
  97     int8_t cpl_bap[256];
  98     int8_t lfe_bap[7];
  99 } a52_state_t;
 100
 101 #define A52_CHANNEL 0
 102 #define A52_MONO 1
 103 #define A52_STEREO 2
 104 #define A52_3F 3
 105 #define A52_2F1R 4
 106 #define A52_3F1R 5
 107 #define A52_2F2R 6
 108 #define A52_3F2R 7
 109 #define A52_CHANNEL1 8
 110 #define A52_CHANNEL2 9
 111 #define A52_DOLBY 10
 112 #define A52_CHANNEL_MASK 15
 113
 114 #define A52_LFE 16
 115 #define A52_ADJUST_LEVEL 32
 116
 117 sample_t * a52_init (uint32_t mm_accel);
 118 int a52_syncinfo (uint8_t * buf, int * flags,
 119                   int * sample_rate, int * bit_rate);
 120 int a52_frame (a52_state_t * state, uint8_t * buf, int * flags,
 121                sample_t * level, sample_t bias);
 122 void a52_dynrng (a52_state_t * state,
 123                  sample_t (* call) (sample_t, void *), void * data);
 124 int a52_block (a52_state_t * state, sample_t * samples);
 125
 126 void* a52_resample_init(uint32_t mm_accel,int flags,int chans);
 127 extern int (* a52_resample) (float * _f, int16_t * s16);
 128
 129 uint16_t crc16_block(uint8_t *data,uint32_t num_bytes);
 130
 131 #endif /* A52_H */