mp3lib/tabinit.c

   1 /*
   2  * Modified for use with MPlayer, for details see the changelog at
   3  * http://svn.mplayerhq.hu/mplayer/trunk/
   4  * $Id$
   5  */
   6
   7 #include "mpg123.h"
   8
   9 real mp3lib_decwin[(512+32)];
  10 static real cos64[32], cos32[16], cos16[8], cos8[4], cos4[2];
  11 real *mp3lib_pnts[]={ cos64,cos32,cos16,cos8,cos4 };
  12
  13 static int intwinbase[] = {
  14      0,    -1,    -1,    -1,    -1,    -1,    -1,    -2,    -2,    -2,
  15     -2,    -3,    -3,    -4,    -4,    -5,    -5,    -6,    -7,    -7,
  16     -8,    -9,   -10,   -11,   -13,   -14,   -16,   -17,   -19,   -21,
  17    -24,   -26,   -29,   -31,   -35,   -38,   -41,   -45,   -49,   -53,
  18    -58,   -63,   -68,   -73,   -79,   -85,   -91,   -97,  -104,  -111,
  19   -117,  -125,  -132,  -139,  -147,  -154,  -161,  -169,  -176,  -183,
  20   -190,  -196,  -202,  -208,  -213,  -218,  -222,  -225,  -227,  -228,
  21   -228,  -227,  -224,  -221,  -215,  -208,  -200,  -189,  -177,  -163,
  22   -146,  -127,  -106,   -83,   -57,   -29,     2,    36,    72,   111,
  23    153,   197,   244,   294,   347,   401,   459,   519,   581,   645,
  24    711,   779,   848,   919,   991,  1064,  1137,  1210,  1283,  1356,
  25   1428,  1498,  1567,  1634,  1698,  1759,  1817,  1870,  1919,  1962,
  26   2001,  2032,  2057,  2075,  2085,  2087,  2080,  2063,  2037,  2000,
  27   1952,  1893,  1822,  1739,  1644,  1535,  1414,  1280,  1131,   970,
  28    794,   605,   402,   185,   -45,  -288,  -545,  -814, -1095, -1388,
  29  -1692, -2006, -2330, -2663, -3004, -3351, -3705, -4063, -4425, -4788,
  30  -5153, -5517, -5879, -6237, -6589, -6935, -7271, -7597, -7910, -8209,
  31  -8491, -8755, -8998, -9219, -9416, -9585, -9727, -9838, -9916, -9959,
  32  -9966, -9935, -9863, -9750, -9592, -9389, -9139, -8840, -8492, -8092,
  33  -7640, -7134, -6574, -5959, -5288, -4561, -3776, -2935, -2037, -1082,
  34    -70,   998,  2122,  3300,  4533,  5818,  7154,  8540,  9975, 11455,
  35  12980, 14548, 16155, 17799, 19478, 21189, 22929, 24694, 26482, 28289,
  36  30112, 31947, 33791, 35640, 37489, 39336, 41176, 43006, 44821, 46617,
  37  48390, 50137, 51853, 53534, 55178, 56778, 58333, 59838, 61289, 62684,
  38  64019, 65290, 66494, 67629, 68692, 69679, 70590, 71420, 72169, 72835,
  39  73415, 73908, 74313, 74630, 74856, 74992, 75038 };
  40
  41 static void make_decode_tables(long scaleval)
  42 {
  43   int i,j,k,kr,divv;
  44   real *table,*costab;
  45
  46
  47   for(i=0;i<5;i++)
  48   {
  49     kr=0x10>>i; divv=0x40>>i;
  50     costab = mp3lib_pnts[i];
  51     for(k=0;k<kr;k++) costab[k] = 1.0 / (2.0 * cos(M_PI * ((double) k * 2.0 + 1.0) / (double) divv));
  52   }
  53
  54   table = mp3lib_decwin;
  55   scaleval = -scaleval;
  56   for(i=0,j=0;i<256;i++,j++,table+=32)
  57   {
  58     if(table < mp3lib_decwin+512+16)
  59       table[16] = table[0] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
  60     if(i % 32 == 31)
  61       table -= 1023;
  62     if(i % 64 == 63)
  63       scaleval = - scaleval;
  64   }
  65
  66   for( /* i=256 */ ;i<512;i++,j--,table+=32)
  67   {
  68     if(table < mp3lib_decwin+512+16)
  69       table[16] = table[0] = (double) intwinbase[j] / 65536.0 * (double) scaleval;
  70     if(i % 32 == 31)
  71       table -= 1023;
  72     if(i % 64 == 63)
  73       scaleval = - scaleval;
  74   }
  75 }