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📄 mpeglayer2.cpp

📁 MPEG-4编解码的实现(包括MPEG4视音频编解码)
💻 CPP
📖 第 1 页 / 共 3 页
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123 
/* MPEG/WAVE Sound library

   (C) 1997 by Jung woo-jae */

// Mpeglayer2.cc
// It's for MPEG Layer 2

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(_WIN32) && defined(_MSC_VER)
// disable warnings about double to float conversions
#pragma warning(disable: 4244 4305)
#endif

#include "MPEGaudio.h"

#define MAXTABLE 2

// Tables for layer 2
static const int bitalloclengthtable[MAXTABLE][MAXSUBBAND]=
{{4,4,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3},
 {4,4,4,4,4,4,4,4,4,4,4,3,3,3,3,3, 3,3,3,3,3,3,3,2,2,2,2,2,2,2,2,2}};

static const REAL group5bits[27*3]=
{
  -2.0/3.0, -2.0/3.0, -2.0/3.0,
       0.0, -2.0/3.0, -2.0/3.0,
   2.0/3.0, -2.0/3.0, -2.0/3.0,
  -2.0/3.0,      0.0, -2.0/3.0,
       0.0,      0.0, -2.0/3.0,
   2.0/3.0,      0.0, -2.0/3.0,
  -2.0/3.0,  2.0/3.0, -2.0/3.0,
       0.0,  2.0/3.0, -2.0/3.0,
   2.0/3.0,  2.0/3.0, -2.0/3.0,
  -2.0/3.0, -2.0/3.0,      0.0,
       0.0, -2.0/3.0,      0.0,
   2.0/3.0, -2.0/3.0,      0.0,
  -2.0/3.0,      0.0,      0.0,
       0.0,      0.0,      0.0,
   2.0/3.0,      0.0,      0.0,
  -2.0/3.0,  2.0/3.0,      0.0,
       0.0,  2.0/3.0,      0.0,
   2.0/3.0,  2.0/3.0,      0.0,
  -2.0/3.0, -2.0/3.0,  2.0/3.0,
       0.0, -2.0/3.0,  2.0/3.0,
   2.0/3.0, -2.0/3.0,  2.0/3.0,
  -2.0/3.0,      0.0,  2.0/3.0,
       0.0,      0.0,  2.0/3.0,
   2.0/3.0,      0.0,  2.0/3.0,
  -2.0/3.0,  2.0/3.0,  2.0/3.0,
       0.0,  2.0/3.0,  2.0/3.0,
   2.0/3.0,  2.0/3.0,  2.0/3.0
};

static const REAL group7bits[125*3]=
{
 -0.8,-0.8,-0.8, -0.4,-0.8,-0.8, 0.0,-0.8,-0.8, 0.4,-0.8,-0.8, 0.8,-0.8,-0.8,
 -0.8,-0.4,-0.8, -0.4,-0.4,-0.8, 0.0,-0.4,-0.8, 0.4,-0.4,-0.8, 0.8,-0.4,-0.8,
 -0.8, 0.0,-0.8, -0.4, 0.0,-0.8, 0.0, 0.0,-0.8, 0.4, 0.0,-0.8, 0.8, 0.0,-0.8,
 -0.8, 0.4,-0.8, -0.4, 0.4,-0.8, 0.0, 0.4,-0.8, 0.4, 0.4,-0.8, 0.8, 0.4,-0.8,
 -0.8, 0.8,-0.8, -0.4, 0.8,-0.8, 0.0, 0.8,-0.8, 0.4, 0.8,-0.8, 0.8, 0.8,-0.8,
 -0.8,-0.8,-0.4, -0.4,-0.8,-0.4, 0.0,-0.8,-0.4, 0.4,-0.8,-0.4, 0.8,-0.8,-0.4,
 -0.8,-0.4,-0.4, -0.4,-0.4,-0.4, 0.0,-0.4,-0.4, 0.4,-0.4,-0.4, 0.8,-0.4,-0.4,
 -0.8, 0.0,-0.4, -0.4, 0.0,-0.4, 0.0, 0.0,-0.4, 0.4, 0.0,-0.4, 0.8, 0.0,-0.4,
 -0.8, 0.4,-0.4, -0.4, 0.4,-0.4, 0.0, 0.4,-0.4, 0.4, 0.4,-0.4, 0.8, 0.4,-0.4,
 -0.8, 0.8,-0.4, -0.4, 0.8,-0.4, 0.0, 0.8,-0.4, 0.4, 0.8,-0.4, 0.8, 0.8,-0.4,
 -0.8,-0.8, 0.0, -0.4,-0.8, 0.0, 0.0,-0.8, 0.0, 0.4,-0.8, 0.0, 0.8,-0.8, 0.0,
 -0.8,-0.4, 0.0, -0.4,-0.4, 0.0, 0.0,-0.4, 0.0, 0.4,-0.4, 0.0, 0.8,-0.4, 0.0,
 -0.8, 0.0, 0.0, -0.4, 0.0, 0.0, 0.0, 0.0, 0.0, 0.4, 0.0, 0.0, 0.8, 0.0, 0.0,
 -0.8, 0.4, 0.0, -0.4, 0.4, 0.0, 0.0, 0.4, 0.0, 0.4, 0.4, 0.0, 0.8, 0.4, 0.0,
 -0.8, 0.8, 0.0, -0.4, 0.8, 0.0, 0.0, 0.8, 0.0, 0.4, 0.8, 0.0, 0.8, 0.8, 0.0,
 -0.8,-0.8, 0.4, -0.4,-0.8, 0.4, 0.0,-0.8, 0.4, 0.4,-0.8, 0.4, 0.8,-0.8, 0.4,
 -0.8,-0.4, 0.4, -0.4,-0.4, 0.4, 0.0,-0.4, 0.4, 0.4,-0.4, 0.4, 0.8,-0.4, 0.4,
 -0.8, 0.0, 0.4, -0.4, 0.0, 0.4, 0.0, 0.0, 0.4, 0.4, 0.0, 0.4, 0.8, 0.0, 0.4,
 -0.8, 0.4, 0.4, -0.4, 0.4, 0.4, 0.0, 0.4, 0.4, 0.4, 0.4, 0.4, 0.8, 0.4, 0.4,
 -0.8, 0.8, 0.4, -0.4, 0.8, 0.4, 0.0, 0.8, 0.4, 0.4, 0.8, 0.4, 0.8, 0.8, 0.4,
 -0.8,-0.8, 0.8, -0.4,-0.8, 0.8, 0.0,-0.8, 0.8, 0.4,-0.8, 0.8, 0.8,-0.8, 0.8,
 -0.8,-0.4, 0.8, -0.4,-0.4, 0.8, 0.0,-0.4, 0.8, 0.4,-0.4, 0.8, 0.8,-0.4, 0.8,
 -0.8, 0.0, 0.8, -0.4, 0.0, 0.8, 0.0, 0.0, 0.8, 0.4, 0.0, 0.8, 0.8, 0.0, 0.8,
 -0.8, 0.4, 0.8, -0.4, 0.4, 0.8, 0.0, 0.4, 0.8, 0.4, 0.4, 0.8, 0.8, 0.4, 0.8,
 -0.8, 0.8, 0.8, -0.4, 0.8, 0.8, 0.0, 0.8, 0.8, 0.4, 0.8, 0.8, 0.8, 0.8, 0.8
};

static const REAL group10bits[729*3]=
{
 -8.0/9.0,-8.0/9.0,-8.0/9.0, -6.0/9.0,-8.0/9.0,-8.0/9.0, -4.0/9.0,-8.0/9.0,-8.0/9.0,
 -2.0/9.0,-8.0/9.0,-8.0/9.0,      0.0,-8.0/9.0,-8.0/9.0,  2.0/9.0,-8.0/9.0,-8.0/9.0,
  4.0/9.0,-8.0/9.0,-8.0/9.0,  6.0/9.0,-8.0/9.0,-8.0/9.0,  8.0/9.0,-8.0/9.0,-8.0/9.0,
 -8.0/9.0,-6.0/9.0,-8.0/9.0, -6.0/9.0,-6.0/9.0,-8.0/9.0, -4.0/9.0,-6.0/9.0,-8.0/9.0,
 -2.0/9.0,-6.0/9.0,-8.0/9.0,      0.0,-6.0/9.0,-8.0/9.0,  2.0/9.0,-6.0/9.0,-8.0/9.0,
  4.0/9.0,-6.0/9.0,-8.0/9.0,  6.0/9.0,-6.0/9.0,-8.0/9.0,  8.0/9.0,-6.0/9.0,-8.0/9.0,
 -8.0/9.0,-4.0/9.0,-8.0/9.0, -6.0/9.0,-4.0/9.0,-8.0/9.0, -4.0/9.0,-4.0/9.0,-8.0/9.0,
 -2.0/9.0,-4.0/9.0,-8.0/9.0,      0.0,-4.0/9.0,-8.0/9.0,  2.0/9.0,-4.0/9.0,-8.0/9.0,
  4.0/9.0,-4.0/9.0,-8.0/9.0,  6.0/9.0,-4.0/9.0,-8.0/9.0,  8.0/9.0,-4.0/9.0,-8.0/9.0,
 -8.0/9.0,-2.0/9.0,-8.0/9.0, -6.0/9.0,-2.0/9.0,-8.0/9.0, -4.0/9.0,-2.0/9.0,-8.0/9.0,
 -2.0/9.0,-2.0/9.0,-8.0/9.0,      0.0,-2.0/9.0,-8.0/9.0,  2.0/9.0,-2.0/9.0,-8.0/9.0,
  4.0/9.0,-2.0/9.0,-8.0/9.0,  6.0/9.0,-2.0/9.0,-8.0/9.0,  8.0/9.0,-2.0/9.0,-8.0/9.0,
 -8.0/9.0,     0.0,-8.0/9.0, -6.0/9.0,     0.0,-8.0/9.0, -4.0/9.0,     0.0,-8.0/9.0,
 -2.0/9.0,     0.0,-8.0/9.0,      0.0,     0.0,-8.0/9.0,  2.0/9.0,     0.0,-8.0/9.0,
  4.0/9.0,     0.0,-8.0/9.0,  6.0/9.0,     0.0,-8.0/9.0,  8.0/9.0,     0.0,-8.0/9.0,
 -8.0/9.0, 2.0/9.0,-8.0/9.0, -6.0/9.0, 2.0/9.0,-8.0/9.0, -4.0/9.0, 2.0/9.0,-8.0/9.0,
 -2.0/9.0, 2.0/9.0,-8.0/9.0,      0.0, 2.0/9.0,-8.0/9.0,  2.0/9.0, 2.0/9.0,-8.0/9.0,
  4.0/9.0, 2.0/9.0,-8.0/9.0,  6.0/9.0, 2.0/9.0,-8.0/9.0,  8.0/9.0, 2.0/9.0,-8.0/9.0,
 -8.0/9.0, 4.0/9.0,-8.0/9.0, -6.0/9.0, 4.0/9.0,-8.0/9.0, -4.0/9.0, 4.0/9.0,-8.0/9.0,
 -2.0/9.0, 4.0/9.0,-8.0/9.0,      0.0, 4.0/9.0,-8.0/9.0,  2.0/9.0, 4.0/9.0,-8.0/9.0,
  4.0/9.0, 4.0/9.0,-8.0/9.0,  6.0/9.0, 4.0/9.0,-8.0/9.0,  8.0/9.0, 4.0/9.0,-8.0/9.0,
 -8.0/9.0, 6.0/9.0,-8.0/9.0, -6.0/9.0, 6.0/9.0,-8.0/9.0, -4.0/9.0, 6.0/9.0,-8.0/9.0,
 -2.0/9.0, 6.0/9.0,-8.0/9.0,      0.0, 6.0/9.0,-8.0/9.0,  2.0/9.0, 6.0/9.0,-8.0/9.0,
  4.0/9.0, 6.0/9.0,-8.0/9.0,  6.0/9.0, 6.0/9.0,-8.0/9.0,  8.0/9.0, 6.0/9.0,-8.0/9.0,
 -8.0/9.0, 8.0/9.0,-8.0/9.0, -6.0/9.0, 8.0/9.0,-8.0/9.0, -4.0/9.0, 8.0/9.0,-8.0/9.0,
 -2.0/9.0, 8.0/9.0,-8.0/9.0,      0.0, 8.0/9.0,-8.0/9.0,  2.0/9.0, 8.0/9.0,-8.0/9.0,
  4.0/9.0, 8.0/9.0,-8.0/9.0,  6.0/9.0, 8.0/9.0,-8.0/9.0,  8.0/9.0, 8.0/9.0,-8.0/9.0,
 -8.0/9.0,-8.0/9.0,-6.0/9.0, -6.0/9.0,-8.0/9.0,-6.0/9.0, -4.0/9.0,-8.0/9.0,-6.0/9.0,
 -2.0/9.0,-8.0/9.0,-6.0/9.0,      0.0,-8.0/9.0,-6.0/9.0,  2.0/9.0,-8.0/9.0,-6.0/9.0,
  4.0/9.0,-8.0/9.0,-6.0/9.0,  6.0/9.0,-8.0/9.0,-6.0/9.0,  8.0/9.0,-8.0/9.0,-6.0/9.0,
 -8.0/9.0,-6.0/9.0,-6.0/9.0, -6.0/9.0,-6.0/9.0,-6.0/9.0, -4.0/9.0,-6.0/9.0,-6.0/9.0,
 -2.0/9.0,-6.0/9.0,-6.0/9.0,      0.0,-6.0/9.0,-6.0/9.0,  2.0/9.0,-6.0/9.0,-6.0/9.0,
  4.0/9.0,-6.0/9.0,-6.0/9.0,  6.0/9.0,-6.0/9.0,-6.0/9.0,  8.0/9.0,-6.0/9.0,-6.0/9.0,
 -8.0/9.0,-4.0/9.0,-6.0/9.0, -6.0/9.0,-4.0/9.0,-6.0/9.0, -4.0/9.0,-4.0/9.0,-6.0/9.0,
 -2.0/9.0,-4.0/9.0,-6.0/9.0,      0.0,-4.0/9.0,-6.0/9.0,  2.0/9.0,-4.0/9.0,-6.0/9.0,
  4.0/9.0,-4.0/9.0,-6.0/9.0,  6.0/9.0,-4.0/9.0,-6.0/9.0,  8.0/9.0,-4.0/9.0,-6.0/9.0,
 -8.0/9.0,-2.0/9.0,-6.0/9.0, -6.0/9.0,-2.0/9.0,-6.0/9.0, -4.0/9.0,-2.0/9.0,-6.0/9.0,
 -2.0/9.0,-2.0/9.0,-6.0/9.0,      0.0,-2.0/9.0,-6.0/9.0,  2.0/9.0,-2.0/9.0,-6.0/9.0,
  4.0/9.0,-2.0/9.0,-6.0/9.0,  6.0/9.0,-2.0/9.0,-6.0/9.0,  8.0/9.0,-2.0/9.0,-6.0/9.0,
 -8.0/9.0,     0.0,-6.0/9.0, -6.0/9.0,     0.0,-6.0/9.0, -4.0/9.0,     0.0,-6.0/9.0,
 -2.0/9.0,     0.0,-6.0/9.0,      0.0,     0.0,-6.0/9.0,  2.0/9.0,     0.0,-6.0/9.0,
  4.0/9.0,     0.0,-6.0/9.0,  6.0/9.0,     0.0,-6.0/9.0,  8.0/9.0,     0.0,-6.0/9.0,
 -8.0/9.0, 2.0/9.0,-6.0/9.0, -6.0/9.0, 2.0/9.0,-6.0/9.0, -4.0/9.0, 2.0/9.0,-6.0/9.0,
 -2.0/9.0, 2.0/9.0,-6.0/9.0,      0.0, 2.0/9.0,-6.0/9.0,  2.0/9.0, 2.0/9.0,-6.0/9.0,
  4.0/9.0, 2.0/9.0,-6.0/9.0,  6.0/9.0, 2.0/9.0,-6.0/9.0,  8.0/9.0, 2.0/9.0,-6.0/9.0,
 -8.0/9.0, 4.0/9.0,-6.0/9.0, -6.0/9.0, 4.0/9.0,-6.0/9.0, -4.0/9.0, 4.0/9.0,-6.0/9.0,
 -2.0/9.0, 4.0/9.0,-6.0/9.0,      0.0, 4.0/9.0,-6.0/9.0,  2.0/9.0, 4.0/9.0,-6.0/9.0,
  4.0/9.0, 4.0/9.0,-6.0/9.0,  6.0/9.0, 4.0/9.0,-6.0/9.0,  8.0/9.0, 4.0/9.0,-6.0/9.0,
 -8.0/9.0, 6.0/9.0,-6.0/9.0, -6.0/9.0, 6.0/9.0,-6.0/9.0, -4.0/9.0, 6.0/9.0,-6.0/9.0,
 -2.0/9.0, 6.0/9.0,-6.0/9.0,      0.0, 6.0/9.0,-6.0/9.0,  2.0/9.0, 6.0/9.0,-6.0/9.0,
  4.0/9.0, 6.0/9.0,-6.0/9.0,  6.0/9.0, 6.0/9.0,-6.0/9.0,  8.0/9.0, 6.0/9.0,-6.0/9.0,
 -8.0/9.0, 8.0/9.0,-6.0/9.0, -6.0/9.0, 8.0/9.0,-6.0/9.0, -4.0/9.0, 8.0/9.0,-6.0/9.0,
 -2.0/9.0, 8.0/9.0,-6.0/9.0,      0.0, 8.0/9.0,-6.0/9.0,  2.0/9.0, 8.0/9.0,-6.0/9.0,
  4.0/9.0, 8.0/9.0,-6.0/9.0,  6.0/9.0, 8.0/9.0,-6.0/9.0,  8.0/9.0, 8.0/9.0,-6.0/9.0,
 -8.0/9.0,-8.0/9.0,-4.0/9.0, -6.0/9.0,-8.0/9.0,-4.0/9.0, -4.0/9.0,-8.0/9.0,-4.0/9.0,
 -2.0/9.0,-8.0/9.0,-4.0/9.0,      0.0,-8.0/9.0,-4.0/9.0,  2.0/9.0,-8.0/9.0,-4.0/9.0,
  4.0/9.0,-8.0/9.0,-4.0/9.0,  6.0/9.0,-8.0/9.0,-4.0/9.0,  8.0/9.0,-8.0/9.0,-4.0/9.0,
 -8.0/9.0,-6.0/9.0,-4.0/9.0, -6.0/9.0,-6.0/9.0,-4.0/9.0, -4.0/9.0,-6.0/9.0,-4.0/9.0,
 -2.0/9.0,-6.0/9.0,-4.0/9.0,      0.0,-6.0/9.0,-4.0/9.0,  2.0/9.0,-6.0/9.0,-4.0/9.0,
  4.0/9.0,-6.0/9.0,-4.0/9.0,  6.0/9.0,-6.0/9.0,-4.0/9.0,  8.0/9.0,-6.0/9.0,-4.0/9.0,
 -8.0/9.0,-4.0/9.0,-4.0/9.0, -6.0/9.0,-4.0/9.0,-4.0/9.0, -4.0/9.0,-4.0/9.0,-4.0/9.0,
 -2.0/9.0,-4.0/9.0,-4.0/9.0,      0.0,-4.0/9.0,-4.0/9.0,  2.0/9.0,-4.0/9.0,-4.0/9.0,
  4.0/9.0,-4.0/9.0,-4.0/9.0,  6.0/9.0,-4.0/9.0,-4.0/9.0,  8.0/9.0,-4.0/9.0,-4.0/9.0,
 -8.0/9.0,-2.0/9.0,-4.0/9.0, -6.0/9.0,-2.0/9.0,-4.0/9.0, -4.0/9.0,-2.0/9.0,-4.0/9.0,
 -2.0/9.0,-2.0/9.0,-4.0/9.0,      0.0,-2.0/9.0,-4.0/9.0,  2.0/9.0,-2.0/9.0,-4.0/9.0,
  4.0/9.0,-2.0/9.0,-4.0/9.0,  6.0/9.0,-2.0/9.0,-4.0/9.0,  8.0/9.0,-2.0/9.0,-4.0/9.0,
 -8.0/9.0,     0.0,-4.0/9.0, -6.0/9.0,     0.0,-4.0/9.0, -4.0/9.0,     0.0,-4.0/9.0,
 -2.0/9.0,     0.0,-4.0/9.0,      0.0,     0.0,-4.0/9.0,  2.0/9.0,     0.0,-4.0/9.0,
  4.0/9.0,     0.0,-4.0/9.0,  6.0/9.0,     0.0,-4.0/9.0,  8.0/9.0,     0.0,-4.0/9.0,
 -8.0/9.0, 2.0/9.0,-4.0/9.0, -6.0/9.0, 2.0/9.0,-4.0/9.0, -4.0/9.0, 2.0/9.0,-4.0/9.0,
 -2.0/9.0, 2.0/9.0,-4.0/9.0,      0.0, 2.0/9.0,-4.0/9.0,  2.0/9.0, 2.0/9.0,-4.0/9.0,
  4.0/9.0, 2.0/9.0,-4.0/9.0,  6.0/9.0, 2.0/9.0,-4.0/9.0,  8.0/9.0, 2.0/9.0,-4.0/9.0,
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123

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