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C/C++ Source or Header  |  2000-01-01  |  9.3 KB  |  318 lines
  1. #ifdef HAVEMPGLIB
  2. /*
  3.  * Discrete Cosine Tansform (DCT) for subband synthesis
  4.  * optimized for machines with no auto-increment. 
  5.  * The performance is highly compiler dependend. Maybe
  6.  * the dct64.c version for 'normal' processor may be faster
  7.  * even for Intel processors.
  8.  */
  9.  
  10. #include "mpg123.h"
  11.  
  12. static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples)
  13. {
  14.  
  15.  {
  16.   register real *costab = pnts[0];
  17.  
  18.   b1[0x00] = samples[0x00] + samples[0x1F];
  19.   b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
  20.  
  21.   b1[0x01] = samples[0x01] + samples[0x1E];
  22.   b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
  23.  
  24.   b1[0x02] = samples[0x02] + samples[0x1D];
  25.   b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
  26.  
  27.   b1[0x03] = samples[0x03] + samples[0x1C];
  28.   b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
  29.  
  30.   b1[0x04] = samples[0x04] + samples[0x1B];
  31.   b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
  32.  
  33.   b1[0x05] = samples[0x05] + samples[0x1A];
  34.   b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
  35.  
  36.   b1[0x06] = samples[0x06] + samples[0x19];
  37.   b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
  38.  
  39.   b1[0x07] = samples[0x07] + samples[0x18];
  40.   b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
  41.  
  42.   b1[0x08] = samples[0x08] + samples[0x17];
  43.   b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
  44.  
  45.   b1[0x09] = samples[0x09] + samples[0x16];
  46.   b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
  47.  
  48.   b1[0x0A] = samples[0x0A] + samples[0x15];
  49.   b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
  50.  
  51.   b1[0x0B] = samples[0x0B] + samples[0x14];
  52.   b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
  53.  
  54.   b1[0x0C] = samples[0x0C] + samples[0x13];
  55.   b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
  56.  
  57.   b1[0x0D] = samples[0x0D] + samples[0x12];
  58.   b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
  59.  
  60.   b1[0x0E] = samples[0x0E] + samples[0x11];
  61.   b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
  62.  
  63.   b1[0x0F] = samples[0x0F] + samples[0x10];
  64.   b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
  65.  }
  66.  
  67.  
  68.  {
  69.   register real *costab = pnts[1];
  70.  
  71.   b2[0x00] = b1[0x00] + b1[0x0F]; 
  72.   b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
  73.   b2[0x01] = b1[0x01] + b1[0x0E]; 
  74.   b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
  75.   b2[0x02] = b1[0x02] + b1[0x0D]; 
  76.   b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
  77.   b2[0x03] = b1[0x03] + b1[0x0C]; 
  78.   b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
  79.   b2[0x04] = b1[0x04] + b1[0x0B]; 
  80.   b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
  81.   b2[0x05] = b1[0x05] + b1[0x0A]; 
  82.   b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
  83.   b2[0x06] = b1[0x06] + b1[0x09]; 
  84.   b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
  85.   b2[0x07] = b1[0x07] + b1[0x08]; 
  86.   b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
  87.  
  88.   b2[0x10] = b1[0x10] + b1[0x1F];
  89.   b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
  90.   b2[0x11] = b1[0x11] + b1[0x1E];
  91.   b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
  92.   b2[0x12] = b1[0x12] + b1[0x1D];
  93.   b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
  94.   b2[0x13] = b1[0x13] + b1[0x1C];
  95.   b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
  96.   b2[0x14] = b1[0x14] + b1[0x1B];
  97.   b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
  98.   b2[0x15] = b1[0x15] + b1[0x1A];
  99.   b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
  100.   b2[0x16] = b1[0x16] + b1[0x19];
  101.   b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
  102.   b2[0x17] = b1[0x17] + b1[0x18];
  103.   b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
  104.  }
  105.  
  106.  {
  107.   register real *costab = pnts[2];
  108.  
  109.   b1[0x00] = b2[0x00] + b2[0x07];
  110.   b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
  111.   b1[0x01] = b2[0x01] + b2[0x06];
  112.   b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
  113.   b1[0x02] = b2[0x02] + b2[0x05];
  114.   b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
  115.   b1[0x03] = b2[0x03] + b2[0x04];
  116.   b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
  117.  
  118.   b1[0x08] = b2[0x08] + b2[0x0F];
  119.   b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
  120.   b1[0x09] = b2[0x09] + b2[0x0E];
  121.   b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
  122.   b1[0x0A] = b2[0x0A] + b2[0x0D];
  123.   b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
  124.   b1[0x0B] = b2[0x0B] + b2[0x0C];
  125.   b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
  126.  
  127.   b1[0x10] = b2[0x10] + b2[0x17];
  128.   b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
  129.   b1[0x11] = b2[0x11] + b2[0x16];
  130.   b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
  131.   b1[0x12] = b2[0x12] + b2[0x15];
  132.   b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
  133.   b1[0x13] = b2[0x13] + b2[0x14];
  134.   b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
  135.  
  136.   b1[0x18] = b2[0x18] + b2[0x1F];
  137.   b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
  138.   b1[0x19] = b2[0x19] + b2[0x1E];
  139.   b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
  140.   b1[0x1A] = b2[0x1A] + b2[0x1D];
  141.   b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
  142.   b1[0x1B] = b2[0x1B] + b2[0x1C];
  143.   b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
  144.  }
  145.  
  146.  {
  147.   register real const cos0 = pnts[3][0];
  148.   register real const cos1 = pnts[3][1];
  149.  
  150.   b2[0x00] = b1[0x00] + b1[0x03];
  151.   b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
  152.   b2[0x01] = b1[0x01] + b1[0x02];
  153.   b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
  154.  
  155.   b2[0x04] = b1[0x04] + b1[0x07];
  156.   b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
  157.   b2[0x05] = b1[0x05] + b1[0x06];
  158.   b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
  159.  
  160.   b2[0x08] = b1[0x08] + b1[0x0B];
  161.   b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
  162.   b2[0x09] = b1[0x09] + b1[0x0A];
  163.   b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
  164.   
  165.   b2[0x0C] = b1[0x0C] + b1[0x0F];
  166.   b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
  167.   b2[0x0D] = b1[0x0D] + b1[0x0E];
  168.   b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
  169.  
  170.   b2[0x10] = b1[0x10] + b1[0x13];
  171.   b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
  172.   b2[0x11] = b1[0x11] + b1[0x12];
  173.   b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
  174.  
  175.   b2[0x14] = b1[0x14] + b1[0x17];
  176.   b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
  177.   b2[0x15] = b1[0x15] + b1[0x16];
  178.   b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
  179.  
  180.   b2[0x18] = b1[0x18] + b1[0x1B];
  181.   b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
  182.   b2[0x19] = b1[0x19] + b1[0x1A];
  183.   b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
  184.  
  185.   b2[0x1C] = b1[0x1C] + b1[0x1F];
  186.   b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
  187.   b2[0x1D] = b1[0x1D] + b1[0x1E];
  188.   b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
  189.  }
  190.  
  191.  {
  192.   register real const cos0 = pnts[4][0];
  193.  
  194.   b1[0x00] = b2[0x00] + b2[0x01];
  195.   b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
  196.   b1[0x02] = b2[0x02] + b2[0x03];
  197.   b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
  198.   b1[0x02] += b1[0x03];
  199.  
  200.   b1[0x04] = b2[0x04] + b2[0x05];
  201.   b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
  202.   b1[0x06] = b2[0x06] + b2[0x07];
  203.   b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
  204.   b1[0x06] += b1[0x07];
  205.   b1[0x04] += b1[0x06];
  206.   b1[0x06] += b1[0x05];
  207.   b1[0x05] += b1[0x07];
  208.  
  209.   b1[0x08] = b2[0x08] + b2[0x09];
  210.   b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
  211.   b1[0x0A] = b2[0x0A] + b2[0x0B];
  212.   b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
  213.   b1[0x0A] += b1[0x0B];
  214.  
  215.   b1[0x0C] = b2[0x0C] + b2[0x0D];
  216.   b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
  217.   b1[0x0E] = b2[0x0E] + b2[0x0F];
  218.   b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
  219.   b1[0x0E] += b1[0x0F];
  220.   b1[0x0C] += b1[0x0E];
  221.   b1[0x0E] += b1[0x0D];
  222.   b1[0x0D] += b1[0x0F];
  223.  
  224.   b1[0x10] = b2[0x10] + b2[0x11];
  225.   b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
  226.   b1[0x12] = b2[0x12] + b2[0x13];
  227.   b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
  228.   b1[0x12] += b1[0x13];
  229.  
  230.   b1[0x14] = b2[0x14] + b2[0x15];
  231.   b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
  232.   b1[0x16] = b2[0x16] + b2[0x17];
  233.   b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
  234.   b1[0x16] += b1[0x17];
  235.   b1[0x14] += b1[0x16];
  236.   b1[0x16] += b1[0x15];
  237.   b1[0x15] += b1[0x17];
  238.  
  239.   b1[0x18] = b2[0x18] + b2[0x19];
  240.   b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
  241.   b1[0x1A] = b2[0x1A] + b2[0x1B];
  242.   b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
  243.   b1[0x1A] += b1[0x1B];
  244.  
  245.   b1[0x1C] = b2[0x1C] + b2[0x1D];
  246.   b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
  247.   b1[0x1E] = b2[0x1E] + b2[0x1F];
  248.   b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
  249.   b1[0x1E] += b1[0x1F];
  250.   b1[0x1C] += b1[0x1E];
  251.   b1[0x1E] += b1[0x1D];
  252.   b1[0x1D] += b1[0x1F];
  253.  }
  254.  
  255.  out0[0x10*16] = b1[0x00];
  256.  out0[0x10*12] = b1[0x04];
  257.  out0[0x10* 8] = b1[0x02];
  258.  out0[0x10* 4] = b1[0x06];
  259.  out0[0x10* 0] = b1[0x01];
  260.  out1[0x10* 0] = b1[0x01];
  261.  out1[0x10* 4] = b1[0x05];
  262.  out1[0x10* 8] = b1[0x03];
  263.  out1[0x10*12] = b1[0x07];
  264.  
  265.  b1[0x08] += b1[0x0C];
  266.  out0[0x10*14] = b1[0x08];
  267.  b1[0x0C] += b1[0x0a];
  268.  out0[0x10*10] = b1[0x0C];
  269.  b1[0x0A] += b1[0x0E];
  270.  out0[0x10* 6] = b1[0x0A];
  271.  b1[0x0E] += b1[0x09];
  272.  out0[0x10* 2] = b1[0x0E];
  273.  b1[0x09] += b1[0x0D];
  274.  out1[0x10* 2] = b1[0x09];
  275.  b1[0x0D] += b1[0x0B];
  276.  out1[0x10* 6] = b1[0x0D];
  277.  b1[0x0B] += b1[0x0F];
  278.  out1[0x10*10] = b1[0x0B];
  279.  out1[0x10*14] = b1[0x0F];
  280.  
  281.  b1[0x18] += b1[0x1C];
  282.  out0[0x10*15] = b1[0x10] + b1[0x18];
  283.  out0[0x10*13] = b1[0x18] + b1[0x14];
  284.  b1[0x1C] += b1[0x1a];
  285.  out0[0x10*11] = b1[0x14] + b1[0x1C];
  286.  out0[0x10* 9] = b1[0x1C] + b1[0x12];
  287.  b1[0x1A] += b1[0x1E];
  288.  out0[0x10* 7] = b1[0x12] + b1[0x1A];
  289.  out0[0x10* 5] = b1[0x1A] + b1[0x16];
  290.  b1[0x1E] += b1[0x19];
  291.  out0[0x10* 3] = b1[0x16] + b1[0x1E];
  292.  out0[0x10* 1] = b1[0x1E] + b1[0x11];
  293.  b1[0x19] += b1[0x1D];
  294.  out1[0x10* 1] = b1[0x11] + b1[0x19];
  295.  out1[0x10* 3] = b1[0x19] + b1[0x15];
  296.  b1[0x1D] += b1[0x1B];
  297.  out1[0x10* 5] = b1[0x15] + b1[0x1D];
  298.  out1[0x10* 7] = b1[0x1D] + b1[0x13];
  299.  b1[0x1B] += b1[0x1F];
  300.  out1[0x10* 9] = b1[0x13] + b1[0x1B];
  301.  out1[0x10*11] = b1[0x1B] + b1[0x17];
  302.  out1[0x10*13] = b1[0x17] + b1[0x1F];
  303.  out1[0x10*15] = b1[0x1F];
  304. }
  305.  
  306. /*
  307.  * the call via dct64 is a trick to force GCC to use
  308.  * (new) registers for the b1,b2 pointer to the bufs[xx] field
  309.  */
  310. void dct64(real *a,real *b,real *c)
  311. {
  312.   real bufs[0x40];
  313.   dct64_1(a,b,bufs,bufs+0x20,c);
  314. }
  315.  
  316.  
  317. #endif
  318.