mpegtable.cpp

完整的RTP RTSP代码库

/* MPEG/WAVE Sound library

   (C) 1997 by Jung woo-jae */

// Mpegtable.cc
// It has tables for MPEG layer 1, 2 and a part of layer 3

#include "mpeg4ip.h"
#ifdef _MSC_VER
#pragma warning(disable:4305) 
#endif

#include "MPEGaudio.h"

// For header
const int MPEGaudio::frequencies[9]=
{
  44100,48000,32000, // MPEG 1
  22050,24000,16000,  // MPEG 2
  11025,12000, 8000, // mpeg 2.5
};

const int MPEGaudio::bitrate[2][3][15]=
{
  // MPEG 1
  {{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448},
   {0,32,48,56,64,80,96,112,128,160,192,224,256,320,384},
   {0,32,40,48,56,64,80,96,112,128,160,192,224,256,320}},

  // MPEG 2
  {{0,32,48,56,64,80,96,112,128,144,160,176,192,224,256},
   {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160},
   {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160}}
};

// Mpeg general table
const REAL MPEGaudio::scalefactorstable[64] =
{
  2.00000000000000, 1.58740105196820, 1.25992104989487, 1.00000000000000,
  0.79370052598410, 0.62996052494744, 0.50000000000000, 0.39685026299205,
  0.31498026247372, 0.25000000000000, 0.19842513149602, 0.15749013123686,
  0.12500000000000, 0.09921256574801, 0.07874506561843, 0.06250000000000,
  0.04960628287401, 0.03937253280921, 0.03125000000000, 0.02480314143700,
  0.01968626640461, 0.01562500000000, 0.01240157071850, 0.00984313320230,
  0.00781250000000, 0.00620078535925, 0.00492156660115, 0.00390625000000,
  0.00310039267963, 0.00246078330058, 0.00195312500000, 0.00155019633981,
  0.00123039165029, 0.00097656250000, 0.00077509816991, 0.00061519582514,
  0.00048828125000, 0.00038754908495, 0.00030759791257, 0.00024414062500,
  0.00019377454248, 0.00015379895629, 0.00012207031250, 0.00009688727124,
  0.00007689947814, 0.00006103515625, 0.00004844363562, 0.00003844973907,
  0.00003051757813, 0.00002422181781, 0.00001922486954, 0.00001525878906,
  0.00001211090890, 0.00000961243477, 0.00000762939453, 0.00000605545445,
  0.00000480621738, 0.00000381469727, 0.00000302772723, 0.00000240310869,
  0.00000190734863, 0.00000151386361, 0.00000120155435, 0.00000000000000
};

const REAL MPEGaudio::filter[512]=
{
   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,
   1.138763428,  0.487472534,  0.123474121,  0.061996460,
   0.031845093,  0.004486084,  0.002990723,  0.000320435,
  -0.000015259, -0.000625610,  0.003463745, -0.010848999,
   0.027801514, -0.100540161,  0.057617188, -0.683914185,
   1.133926392,  0.459472656,  0.129577637,  0.056533813,
   0.031814575,  0.003723145,  0.002899170,  0.000289917,
  -0.000015259, -0.000686646,  0.003479004, -0.011886597,
   0.026535034, -0.105819702,  0.044784546, -0.711318970,
   1.127746582,  0.431655884,  0.134887695,  0.051132202,
   0.031661987,  0.003005981,  0.002792358,  0.000259399,
  -0.000015259, -0.000747681,  0.003479004, -0.012939453,
   0.025085449, -0.110946655,  0.031082153, -0.738372803,
   1.120223999,  0.404083252,  0.139450073,  0.045837402,
   0.031387329,  0.002334595,  0.002685547,  0.000244141,
  -0.000030518, -0.000808716,  0.003463745, -0.014022827,
   0.023422241, -0.115921021,  0.016510010, -0.765029907,
   1.111373901,  0.376800537,  0.143264771,  0.040634155,
   0.031005859,  0.001693726,  0.002578735,  0.000213623,
  -0.000030518, -0.000885010,  0.003417969, -0.015121460,
   0.021575928, -0.120697021,  0.001068115, -0.791213989,
   1.101211548,  0.349868774,  0.146362305,  0.035552979,
   0.030532837,  0.001098633,  0.002456665,  0.000198364,
  -0.000030518, -0.000961304,  0.003372192, -0.016235352,
   0.019531250, -0.125259399, -0.015228271, -0.816864014,
   1.089782715,  0.323318481,  0.148773193,  0.030609131,
   0.029937744,  0.000549316,  0.002349854,  0.000167847,
  -0.000030518, -0.001037598,  0.003280640, -0.017349243,
   0.017257690, -0.129562378, -0.032379150, -0.841949463,
   1.077117920,  0.297210693,  0.150497437,  0.025817871,
   0.029281616,  0.000030518,  0.002243042,  0.000152588,
  -0.000045776, -0.001113892,  0.003173828, -0.018463135,
   0.014801025, -0.133590698, -0.050354004, -0.866363525,
   1.063217163,  0.271591187,  0.151596069,  0.021179199,
   0.028533936, -0.000442505,  0.002120972,  0.000137329,
  -0.000045776, -0.001205444,  0.003051758, -0.019577026,
   0.012115479, -0.137298584, -0.069168091, -0.890090942,
   1.048156738,  0.246505737,  0.152069092,  0.016708374,
   0.027725220, -0.000869751,  0.002014160,  0.000122070,
  -0.000061035, -0.001296997,  0.002883911, -0.020690918,
   0.009231567, -0.140670776, -0.088775635, -0.913055420,
   1.031936646,  0.221984863,  0.151962280,  0.012420654,
   0.026840210, -0.001266479,  0.001907349,  0.000106812,
  -0.000061035, -0.001388550,  0.002700806, -0.021789551,
   0.006134033, -0.143676758, -0.109161377, -0.935195923,
   1.014617920,  0.198059082,  0.151306152,  0.008316040,
   0.025909424, -0.001617432,  0.001785278,  0.000106812,
  -0.000076294, -0.001480103,  0.002487183, -0.022857666,
   0.002822876, -0.146255493, -0.130310059, -0.956481934,
   0.996246338,  0.174789429,  0.150115967,  0.004394531,
   0.024932861, -0.001937866,  0.001693726,  0.000091553,
  -0.000076294, -0.001586914,  0.002227783, -0.023910522,
  -0.000686646, -0.148422241, -0.152206421, -0.976852417,
   0.976852417,  0.152206421,  0.148422241,  0.000686646,
   0.023910522, -0.002227783,  0.001586914,  0.000076294,
  -0.000091553, -0.001693726,  0.001937866, -0.024932861,
  -0.004394531, -0.150115967, -0.174789429, -0.996246338,
   0.956481934,  0.130310059,  0.146255493, -0.002822876,
   0.022857666, -0.002487183,  0.001480103,  0.000076294,
  -0.000106812, -0.001785278,  0.001617432, -0.025909424,
  -0.008316040, -0.151306152, -0.198059082, -1.014617920,
   0.935195923,  0.109161377,  0.143676758, -0.006134033,
   0.021789551, -0.002700806,  0.001388550,  0.000061035,
  -0.000106812, -0.001907349,  0.001266479, -0.026840210,
  -0.012420654, -0.151962280, -0.221984863, -1.031936646,
   0.913055420,  0.088775635,  0.140670776, -0.009231567,
   0.020690918, -0.002883911,  0.001296997,  0.000061035,
  -0.000122070, -0.002014160,  0.000869751, -0.027725220,
  -0.016708374, -0.152069092, -0.246505737, -1.048156738,
   0.890090942,  0.069168091,  0.137298584, -0.012115479,
   0.019577026, -0.003051758,  0.001205444,  0.000045776,
  -0.000137329, -0.002120972,  0.000442505, -0.028533936,
  -0.021179199, -0.151596069, -0.271591187, -1.063217163,
   0.866363525,  0.050354004,  0.133590698, -0.014801025,
   0.018463135, -0.003173828,  0.001113892,  0.000045776,
  -0.000152588, -0.002243042, -0.000030518, -0.029281616,
  -0.025817871, -0.150497437, -0.297210693, -1.077117920,
   0.841949463,  0.032379150,  0.129562378, -0.017257690,
   0.017349243, -0.003280640,  0.001037598,  0.000030518,
  -0.000167847, -0.002349854, -0.000549316, -0.029937744,
  -0.030609131, -0.148773193, -0.323318481, -1.089782715,
   0.816864014,  0.015228271,  0.125259399, -0.019531250,
   0.016235352, -0.003372192,  0.000961304,  0.000030518,
  -0.000198364, -0.002456665, -0.001098633, -0.030532837,
  -0.035552979, -0.146362305, -0.349868774, -1.101211548,
   0.791213989, -0.001068115,  0.120697021, -0.021575928,
   0.015121460, -0.003417969,  0.000885010,  0.000030518,
  -0.000213623, -0.002578735, -0.001693726, -0.031005859,
  -0.040634155, -0.143264771, -0.376800537, -1.111373901,
   0.765029907, -0.016510010,  0.115921021, -0.023422241,
   0.014022827, -0.003463745,  0.000808716,  0.000030518,
  -0.000244141, -0.002685547, -0.002334595, -0.031387329,
  -0.045837402, -0.139450073, -0.404083252, -1.120223999,
   0.738372803, -0.031082153,  0.110946655, -0.025085449,
   0.012939453, -0.003479004,  0.000747681,  0.000015259,
  -0.000259399, -0.002792358, -0.003005981, -0.031661987,
  -0.051132202, -0.134887695, -0.431655884, -1.127746582,
   0.711318970, -0.044784546,  0.105819702, -0.026535034,
   0.011886597, -0.003479004,  0.000686646,  0.000015259,
  -0.000289917, -0.002899170, -0.003723145, -0.031814575,
  -0.056533813, -0.129577637, -0.459472656, -1.133926392,
   0.683914185, -0.057617188,  0.100540161, -0.027801514,
   0.010848999, -0.003463745,  0.000625610,  0.000015259,
  -0.000320435, -0.002990723, -0.004486084, -0.031845093,
  -0.061996460, -0.123474121, -0.487472534, -1.138763428,
   0.656219482, -0.069595337,  0.095169067, -0.028884888,
   0.009841919, -0.003433228,  0.000579834,  0.000015259,
  -0.000366211, -0.003082275, -0.005294800, -0.031738281,
  -0.067520142, -0.116577148, -0.515609741, -1.142211914,
   0.628295898, -0.080688477,  0.089706421, -0.029785156,
   0.008865356, -0.003387451,  0.000534058,  0.000015259,
  -0.000396729, -0.003173828, -0.006118774, -0.031478882,
  -0.073059082, -0.108856201, -0.543823242, -1.144287109,
   0.600219727, -0.090927124,  0.084182739, -0.030517578,
   0.007919312, -0.003326416,  0.000473022,  0.000015259
};

REAL MPEGaudio::hcos_64[16],
     MPEGaudio::hcos_32[ 8],
     MPEGaudio::hcos_16[ 4],
     MPEGaudio::hcos_8 [ 2],
     MPEGaudio::hcos_4;