synthesis_filter.cc

ac3的解码程序

/*
   File: synthesis_filter.cc
*/

#include <stdio.h>
#include <stdlib.h>
#include <fstream.h>
#ifdef IRIX
#include <dmedia/audio.h>
#endif
#ifdef SOLARIS
#include <sys/audioio.h>
#endif

#include "athread.hh"

#include "error.hh"
#include "debug.hh"
#include "util.hh"

#include "sync.hh"
#include "mpeg2const.hh"
#include "mpeg2buff.hh"

#include "astream.hh"
#include "crc.hh"
#include "header.hh"
#include "obuffer.hh"
#include "synthesis_filter.hh"


const real SynthesisFilter::n[32][31] = {
  {  0.707106781,  0.671558955,  0.634393284,  0.595699304,
     0.555570233,  0.514102744,  0.471396737,  0.427555093,
     0.382683432,  0.336889853,  0.290284677,  0.242980180,
     0.195090322,  0.146730474,  0.098017140,  0.049067674,
    -0.740951126, -0.773010454, -0.803207532, -0.831469612,
    -0.857728610, -0.881921265, -0.903989293, -0.923879533,
    -0.941544065, -0.956940336, -0.970031253, -0.980785280,
    -0.989176510, -0.995184727, -0.998795456 },
  { -0.707106781, -0.803207532, -0.881921265, -0.941544065,
    -0.980785280, -0.998795456, -0.995184727, -0.970031253,
    -0.923879532, -0.857728610, -0.773010453, -0.671558954,
    -0.555570233, -0.427555093, -0.290284677, -0.146730474,
     0.595699304,  0.471396737,  0.336889853,  0.195090322,
     0.049067674, -0.098017141, -0.242980180, -0.382683433,
    -0.514102744, -0.634393284, -0.740951126, -0.831469612,
    -0.903989293, -0.956940336, -0.989176510 },
  { -0.707106781, -0.514102744, -0.290284677, -0.049067674,
     0.195090323,  0.427555094,  0.634393285,  0.803207532,
     0.923879533,  0.989176510,  0.995184727,  0.941544065,
     0.831469612,  0.671558955,  0.471396737,  0.242980180,
     0.857728610,  0.956940336,  0.998795456,  0.980785280,
     0.903989293,  0.773010453,  0.595699304,  0.382683432,
     0.146730474, -0.098017141, -0.336889854, -0.555570233,
    -0.740951126, -0.881921265, -0.970031253 },
  {  0.707106782,  0.903989293,  0.995184727,  0.970031253,
     0.831469612,  0.595699304,  0.290284677, -0.049067675,
    -0.382683433, -0.671558955, -0.881921265, -0.989176510,
    -0.980785280, -0.857728610, -0.634393284, -0.336889853,
    -0.427555093, -0.098017140,  0.242980181,  0.555570234,
     0.803207532,  0.956940336,  0.998795456,  0.923879532,
     0.740951125,  0.471396737,  0.146730474, -0.195090322,
    -0.514102744, -0.773010454, -0.941544065 },
  {  0.707106781,  0.336889853, -0.098017141, -0.514102744,
    -0.831469612, -0.989176510, -0.956940336, -0.740951125,
    -0.382683432,  0.049067675,  0.471396737,  0.803207532,
     0.980785281,  0.970031253,  0.773010453,  0.427555093,
    -0.941544065, -0.995184727, -0.857728610, -0.555570233,
    -0.146730474,  0.290284678,  0.671558955,  0.923879533,
     0.998795456,  0.881921264,  0.595699304,  0.195090322,
    -0.242980180, -0.634393284, -0.903989293 },
  { -0.707106781, -0.970031253, -0.956940336, -0.671558954,
    -0.195090321,  0.336889854,  0.773010454,  0.989176510,
     0.923879532,  0.595699304,  0.098017140, -0.427555094,
    -0.831469612, -0.998795456, -0.881921264, -0.514102744,
     0.242980180, -0.290284677, -0.740951126, -0.980785280,
    -0.941544065, -0.634393284, -0.146730474,  0.382683433,
     0.803207532,  0.995184727,  0.903989293,  0.555570233,
     0.049067674, -0.471396737, -0.857728610 },
  { -0.707106781, -0.146730474,  0.471396737,  0.903989293,
     0.980785280,  0.671558955,  0.098017140, -0.514102744,
    -0.923879533, -0.970031253, -0.634393284, -0.049067674,
     0.555570234,  0.941544065,  0.956940336,  0.595699304,
     0.989176510,  0.881921264,  0.427555093, -0.195090322,
    -0.740951126, -0.995184727, -0.857728610, -0.382683432,
     0.242980181,  0.773010454,  0.998795456,  0.831469612,
     0.336889853, -0.290284677, -0.803207532 },
  {  0.707106782,  0.998795456,  0.773010453,  0.146730474,
    -0.555570233, -0.970031253, -0.881921264, -0.336889853,
     0.382683433,  0.903989293,  0.956940336,  0.514102744,
    -0.195090322, -0.803207532, -0.995184727, -0.671558954,
    -0.049067674,  0.634393285,  0.989176510,  0.831469612,
     0.242980180, -0.471396737, -0.941544065, -0.923879532,
    -0.427555093,  0.290284678,  0.857728610,  0.980785280,
     0.595699304, -0.098017141, -0.740951126 },
  {  0.707106781, -0.049067675, -0.773010454, -0.989176510,
    -0.555570233,  0.242980181,  0.881921265,  0.941544065,
     0.382683432, -0.427555094, -0.956940336, -0.857728610,
    -0.195090321,  0.595699305,  0.995184727,  0.740951125,
    -0.998795456, -0.634393284,  0.146730475,  0.831469613,
     0.970031253,  0.471396737, -0.336889854, -0.923879533,
    -0.903989293, -0.290284677,  0.514102745,  0.980785281,
     0.803207531,  0.098017140, -0.671558955 },
  { -0.707106781, -0.989176510, -0.471396736,  0.427555094,
     0.980785281,  0.740951125, -0.098017141, -0.857728610,
    -0.923879532, -0.242980179,  0.634393285,  0.998795456,
     0.555570233, -0.336889854, -0.956940336, -0.803207531,
    -0.146730475, -0.881921265, -0.903989293, -0.195090321,
     0.671558955,  0.995184727,  0.514102744, -0.382683433,
    -0.970031253, -0.773010453,  0.049067675,  0.831469613,
     0.941544065,  0.290284677, -0.595699305 },
  { -0.707106781,  0.242980181,  0.956940336,  0.740951125,
    -0.195090322, -0.941544065, -0.773010453,  0.146730475,
     0.923879533,  0.803207531, -0.098017141, -0.903989293,
    -0.831469612,  0.049067675,  0.881921265,  0.857728610,
     0.970031253,  0.290284677, -0.671558955, -0.980785280,
    -0.336889853,  0.634393285,  0.989176510,  0.382683432,
    -0.595699305, -0.995184727, -0.427555093,  0.555570234,
     0.998795456,  0.471396737, -0.514102744 },
  {  0.707106782,  0.941544065,  0.098017140, -0.857728610,
    -0.831469612,  0.146730475,  0.956940336,  0.671558955,
    -0.382683433, -0.998795456, -0.471396736,  0.595699305,
     0.980785280,  0.242980180, -0.773010454, -0.903989293,
     0.336889854,  0.995184727,  0.514102744, -0.555570233,
    -0.989176510, -0.290284677,  0.740951126,  0.923879532,
     0.049067674, -0.881921265, -0.803207531,  0.195090323,
     0.970031253,  0.634393284, -0.427555094 },
  {  0.707106781, -0.427555094, -0.995184727, -0.242980179,
     0.831469613,  0.803207531, -0.290284677, -0.998795456,
    -0.382683432,  0.740951126,  0.881921264, -0.146730475,
    -0.980785280, -0.514102744,  0.634393285,  0.941544065,
    -0.903989293,  0.098017141,  0.970031253,  0.555570233,
    -0.595699305, -0.956940336, -0.049067674,  0.923879533,
     0.671558955, -0.471396737, -0.989176510, -0.195090321,
     0.857728610,  0.773010453, -0.336889854 },
  { -0.707106781, -0.857728610,  0.290284678,  0.998795456,
     0.195090322, -0.903989293, -0.634393284,  0.595699305,
     0.923879532, -0.146730475, -0.995184727, -0.336889853,
     0.831469613,  0.740951125, -0.471396737, -0.970031253,
    -0.514102744, -0.956940336,  0.049067675,  0.980785281,
     0.427555093, -0.773010454, -0.803207531,  0.382683433,
     0.989176510,  0.098017140, -0.941544065, -0.555570233,
     0.671558955,  0.881921264, -0.242980180 },
  { -0.707106781,  0.595699305,  0.881921264, -0.336889854,
    -0.980785280,  0.049067675,  0.995184727,  0.242980180,
    -0.923879533, -0.514102744,  0.773010454,  0.740951125,
    -0.555570233, -0.903989293,  0.290284678,  0.989176510,
     0.803207531, -0.471396737, -0.941544065,  0.195090323,
     0.998795456,  0.098017140, -0.970031253, -0.382683432,
     0.857728610,  0.634393284, -0.671558955, -0.831469612,
     0.427555094,  0.956940336, -0.146730475 },
  {  0.707106782,  0.740951125, -0.634393284, -0.803207531,
     0.555570234,  0.857728610, -0.471396737, -0.903989293,
     0.382683433,  0.941544065, -0.290284677, -0.970031253,
     0.195090323,  0.989176510, -0.098017141, -0.998795456,
     0.671558955,  0.773010453, -0.595699305, -0.831469612,
     0.514102745,  0.881921264, -0.427555094, -0.923879532,
     0.336889854,  0.956940336, -0.242980180, -0.980785280,
     0.146730475,  0.995184727, -0.049067675 },
  {  0.707106781, -0.740951126, -0.634393284,  0.803207532,
     0.555570233, -0.857728610, -0.471396736,  0.903989293,
     0.382683432, -0.941544065, -0.290284677,  0.970031253,
     0.195090322, -0.989176510, -0.098017140,  0.998795456,
    -0.671558954,  0.773010454,  0.595699304, -0.831469612,
    -0.514102744,  0.881921265,  0.427555093, -0.923879533,
    -0.336889853,  0.956940336,  0.242980180, -0.980785280,
    -0.146730474,  0.995184727,  0.049067674 },
  { -0.707106781, -0.595699304,  0.881921265,  0.336889853,
    -0.980785280, -0.049067674,  0.995184727, -0.242980180,
    -0.923879532,  0.514102745,  0.773010453, -0.740951126,
    -0.555570233,  0.903989293,  0.290284677, -0.989176510,
    -0.803207532, -0.471396736,  0.941544065,  0.195090322,
    -0.998795456,  0.098017141,  0.970031253, -0.382683433,
    -0.857728610,  0.634393285,  0.671558955, -0.831469612,
    -0.427555093,  0.956940336,  0.146730474 },
  { -0.707106781,  0.857728610,  0.290284677, -0.998795456,
     0.195090323,  0.903989293, -0.634393284, -0.595699304,
     0.923879533,  0.146730474, -0.995184727,  0.336889854,
     0.831469612, -0.740951126, -0.471396736,  0.970031253,
     0.514102744, -0.956940336, -0.049067674,  0.980785280,
    -0.427555094, -0.773010453,  0.803207532,  0.382683432,
    -0.989176510,  0.098017141,  0.941544065, -0.555570233,
    -0.671558954,  0.881921265,  0.242980180 },
  {  0.707106782,  0.427555093, -0.995184727,  0.242980181,
     0.831469612, -0.803207532, -0.290284677,  0.998795456,
    -0.382683433, -0.740951125,  0.881921265,  0.146730474,
    -0.980785280,  0.514102745,  0.634393284, -0.941544065,
     0.903989293,  0.098017140, -0.970031253,  0.555570234,
     0.595699304, -0.956940336,  0.049067675,  0.923879532,
    -0.671558955, -0.471396736,  0.989176510, -0.195090322,
    -0.857728610,  0.773010454,  0.336889853 },
  {  0.707106781, -0.941544065,  0.098017141,  0.857728610,
    -0.831469612, -0.146730474,  0.956940336, -0.671558955,
    -0.382683432,  0.998795456, -0.471396737, -0.595699304,
     0.980785281, -0.242980180, -0.773010453,  0.903989293,
    -0.336889853,  0.995184727, -0.514102744, -0.555570233,
     0.989176510, -0.290284677, -0.740951125,  0.923879533,
    -0.049067675, -0.881921264,  0.803207532,  0.195090322,
    -0.970031253,  0.634393285,  0.427555093 },
  { -0.707106781, -0.242980179,  0.956940336, -0.740951126,
    -0.195090321,  0.941544065, -0.773010454, -0.146730474,
     0.923879532, -0.803207532, -0.098017140,  0.903989293,
    -0.831469612, -0.049067674,  0.881921264, -0.857728610,
    -0.970031253,  0.290284678,  0.671558955, -0.980785280,
     0.336889854,  0.634393284, -0.989176510,  0.382683433,
     0.595699304, -0.995184727,  0.427555094,  0.555570233,
    -0.998795456,  0.471396737,  0.514102744 },
  { -0.707106781,  0.989176510, -0.471396737, -0.427555093,
     0.980785280, -0.740951126, -0.098017140,  0.857728610,
    -0.923879533,  0.242980181,  0.634393284, -0.998795456,
     0.555570234,  0.336889853, -0.956940336,  0.803207532,
     0.146730474, -0.881921264,  0.903989293, -0.195090322,
    -0.671558954,  0.995184727, -0.514102744, -0.382683432,
     0.970031253, -0.773010454, -0.049067674,  0.831469612,
    -0.941544065,  0.290284678,  0.595699304 },
  {  0.707106782,  0.049067674, -0.773010453,  0.989176510,
    -0.555570233, -0.242980179,  0.881921264, -0.941544065,
     0.382683433,  0.427555093, -0.956940336,  0.857728610,
    -0.195090322, -0.595699304,  0.995184727, -0.740951126,
     0.998795456, -0.634393284, -0.146730474,  0.831469612,
    -0.970031253,  0.471396737,  0.336889853, -0.923879532,
     0.903989293, -0.290284677, -0.514102744,  0.980785280,
    -0.803207532,  0.098017141,  0.671558955 },
  {  0.707106781, -0.998795456,  0.773010454, -0.146730475,
    -0.555570233,  0.970031253, -0.881921265,  0.336889854,
     0.382683432, -0.903989293,  0.956940336, -0.514102744,
    -0.195090321,  0.803207531, -0.995184727,  0.671558955,
     0.049067675,  0.634393284, -0.989176510,  0.831469613,
    -0.242980180, -0.471396736,  0.941544065, -0.923879533,
     0.427555094,  0.290284677, -0.857728610,  0.980785281,
    -0.595699305, -0.098017140,  0.740951125 },
  { -0.707106781,  0.146730475,  0.471396737, -0.903989293,
     0.980785281, -0.671558955,  0.098017141,  0.514102744,
    -0.923879532,  0.970031253, -0.634393284,  0.049067675,
     0.555570233, -0.941544065,  0.956940336, -0.595699305,
    -0.989176510,  0.881921265, -0.427555094, -0.195090321,
     0.740951125, -0.995184727,  0.857728610, -0.382683433,
    -0.242980179,  0.773010453, -0.998795456,  0.831469613,
    -0.336889854, -0.290284677,  0.803207531 },
  { -0.707106781,  0.970031253, -0.956940336,  0.671558955,
    -0.195090322, -0.336889853,  0.773010453, -0.989176510,
     0.923879533, -0.595699305,  0.098017141,  0.427555093,
    -0.831469612,  0.998795456, -0.881921265,  0.514102745,
    -0.242980180, -0.290284677,  0.740951125, -0.980785280,
     0.941544065, -0.634393284,  0.146730475,  0.382683432,
    -0.803207531,  0.995184727, -0.903989293,  0.555570234,
    -0.049067675, -0.471396736,  0.857728610 },
  {  0.707106782, -0.336889854, -0.098017140,  0.514102744,
    -0.831469612,  0.989176510, -0.956940336,  0.740951126,
    -0.382683433, -0.049067674,  0.471396737, -0.803207531,
     0.980785280, -0.970031253,  0.773010454, -0.427555094,
     0.941544065, -0.995184727,  0.857728610, -0.555570233,
     0.146730475,  0.290284677, -0.671558954,  0.923879532,
    -0.998795456,  0.881921265, -0.595699305,  0.195090323,
     0.242980180, -0.634393284,  0.903989293 },
  {  0.707106781, -0.903989293,  0.995184727, -0.970031253,
     0.831469613, -0.595699305,  0.290284678,  0.049067674,
    -0.382683432,  0.671558955, -0.881921264,  0.989176510,
    -0.980785280,  0.857728610, -0.634393284,  0.336889854,
     0.427555094, -0.098017141, -0.242980179,  0.555570233,
    -0.803207531,  0.956940336, -0.998795456,  0.923879533,
    -0.740951126,  0.471396737, -0.146730475, -0.195090321,
     0.514102744, -0.773010453,  0.941544065 },
  { -0.707106781,  0.514102745, -0.290284677,  0.049067675,
     0.195090322, -0.427555093,  0.634393284, -0.803207531,
     0.923879532, -0.989176510,  0.995184727, -0.941544065,
     0.831469613, -0.671558955,  0.471396737, -0.242980180,
    -0.857728610,  0.956940336, -0.998795456,  0.980785281,
    -0.903989293,  0.773010454, -0.595699305,  0.382683433,
    -0.146730475, -0.098017140,  0.336889853, -0.555570233,
     0.740951125, -0.881921264,  0.970031253 },
  { -0.707106781,  0.803207531, -0.881921264,  0.941544065,
    -0.980785280,  0.998795456, -0.995184727,  0.970031253,
    -0.923879533,  0.857728610, -0.773010454,  0.671558955,
    -0.555570233,  0.427555094, -0.290284677,  0.146730475,
    -0.595699305,  0.471396737, -0.336889854,  0.195090323,
    -0.049067675, -0.098017140,  0.242980180, -0.382683432,
     0.514102744, -0.634393284,  0.740951125, -0.831469612,
     0.903989293, -0.956940336,  0.989176510 },
  {  0.707106782, -0.671558955,  0.634393285, -0.595699305,
     0.555570234, -0.514102744,  0.471396737, -0.427555094,
     0.382683433, -0.336889854,  0.290284678, -0.242980180,
     0.195090323, -0.146730475,  0.098017141, -0.049067675,
     0.740951125, -0.773010453,  0.803207531, -0.831469612,
     0.857728610, -0.881921264,  0.903989293, -0.923879532,
     0.941544065, -0.956940336,  0.970031253, -0.980785280,
     0.989176510, -0.995184727,  0.998795456 }
};


const real SynthesisFilter::d[512] = {
  // Warning: These values are not in the same order
  // as in Annex 3-B.3 of the ISO/IEC DIS 11172-3
   0.000000000, -0.000442505,  0.003250122, -0.007003784,
   0.031082153, -0.078628540,  0.100311279, -0.572036743,
   1.144989014,  0.572036743,  0.100311279,  0.078628540,
   0.031082153,  0.007003784,  0.003250122,  0.000442505,
  -0.000015259, -0.000473022,  0.003326416, -0.007919312,
   0.030517578, -0.084182739,  0.090927124, -0.600219727,
   1.144287109,  0.543823242,  0.108856201,  0.073059082,
   0.031478882,  0.006118774,  0.003173828,  0.000396729,
  -0.000015259, -0.000534058,  0.003387451, -0.008865356,
   0.029785156, -0.089706421,  0.080688477, -0.628295898,
   1.142211914,  0.515609741,  0.116577148,  0.067520142,
   0.031738281,  0.005294800,  0.003082275,  0.000366211,
  -0.000015259, -0.000579834,  0.003433228, -0.009841919,
   0.028884888, -0.095169067,  0.069595337, -0.656219482,