mp3lib/dct64.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 /*
   8  * Discrete Cosine Tansform (DCT) for subband synthesis
   9  * optimized for machines with no auto-increment.
  10  * The performance is highly compiler dependend. Maybe
  11  * the dct64.c version for 'normal' processor may be faster
  12  * even for Intel processors.
  13  */
  14
  15 static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples)
  16 {
  17
  18  {
  19   register real *costab = mp3lib_pnts[0];
  20
  21   b1[0x00] = samples[0x00] + samples[0x1F];
  22   b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
  23
  24   b1[0x01] = samples[0x01] + samples[0x1E];
  25   b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
  26
  27   b1[0x02] = samples[0x02] + samples[0x1D];
  28   b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
  29
  30   b1[0x03] = samples[0x03] + samples[0x1C];
  31   b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
  32
  33   b1[0x04] = samples[0x04] + samples[0x1B];
  34   b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
  35
  36   b1[0x05] = samples[0x05] + samples[0x1A];
  37   b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
  38
  39   b1[0x06] = samples[0x06] + samples[0x19];
  40   b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
  41
  42   b1[0x07] = samples[0x07] + samples[0x18];
  43   b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
  44
  45   b1[0x08] = samples[0x08] + samples[0x17];
  46   b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
  47
  48   b1[0x09] = samples[0x09] + samples[0x16];
  49   b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
  50
  51   b1[0x0A] = samples[0x0A] + samples[0x15];
  52   b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
  53
  54   b1[0x0B] = samples[0x0B] + samples[0x14];
  55   b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
  56
  57   b1[0x0C] = samples[0x0C] + samples[0x13];
  58   b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
  59
  60   b1[0x0D] = samples[0x0D] + samples[0x12];
  61   b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
  62
  63   b1[0x0E] = samples[0x0E] + samples[0x11];
  64   b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
  65
  66   b1[0x0F] = samples[0x0F] + samples[0x10];
  67   b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
  68  }
  69
  70
  71  {
  72   register real *costab = mp3lib_pnts[1];
  73
  74   b2[0x00] = b1[0x00] + b1[0x0F];
  75   b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
  76   b2[0x01] = b1[0x01] + b1[0x0E];
  77   b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
  78   b2[0x02] = b1[0x02] + b1[0x0D];
  79   b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
  80   b2[0x03] = b1[0x03] + b1[0x0C];
  81   b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
  82   b2[0x04] = b1[0x04] + b1[0x0B];
  83   b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
  84   b2[0x05] = b1[0x05] + b1[0x0A];
  85   b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
  86   b2[0x06] = b1[0x06] + b1[0x09];
  87   b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
  88   b2[0x07] = b1[0x07] + b1[0x08];
  89   b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
  90
  91   b2[0x10] = b1[0x10] + b1[0x1F];
  92   b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
  93   b2[0x11] = b1[0x11] + b1[0x1E];
  94   b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
  95   b2[0x12] = b1[0x12] + b1[0x1D];
  96   b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
  97   b2[0x13] = b1[0x13] + b1[0x1C];
  98   b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
  99   b2[0x14] = b1[0x14] + b1[0x1B];
 100   b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
 101   b2[0x15] = b1[0x15] + b1[0x1A];
 102   b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
 103   b2[0x16] = b1[0x16] + b1[0x19];
 104   b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
 105   b2[0x17] = b1[0x17] + b1[0x18];
 106   b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
 107  }
 108
 109  {
 110   register real *costab = mp3lib_pnts[2];
 111
 112   b1[0x00] = b2[0x00] + b2[0x07];
 113   b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
 114   b1[0x01] = b2[0x01] + b2[0x06];
 115   b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
 116   b1[0x02] = b2[0x02] + b2[0x05];
 117   b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
 118   b1[0x03] = b2[0x03] + b2[0x04];
 119   b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
 120
 121   b1[0x08] = b2[0x08] + b2[0x0F];
 122   b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
 123   b1[0x09] = b2[0x09] + b2[0x0E];
 124   b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
 125   b1[0x0A] = b2[0x0A] + b2[0x0D];
 126   b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
 127   b1[0x0B] = b2[0x0B] + b2[0x0C];
 128   b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
 129
 130   b1[0x10] = b2[0x10] + b2[0x17];
 131   b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
 132   b1[0x11] = b2[0x11] + b2[0x16];
 133   b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
 134   b1[0x12] = b2[0x12] + b2[0x15];
 135   b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
 136   b1[0x13] = b2[0x13] + b2[0x14];
 137   b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
 138
 139   b1[0x18] = b2[0x18] + b2[0x1F];
 140   b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
 141   b1[0x19] = b2[0x19] + b2[0x1E];
 142   b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
 143   b1[0x1A] = b2[0x1A] + b2[0x1D];
 144   b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
 145   b1[0x1B] = b2[0x1B] + b2[0x1C];
 146   b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
 147  }
 148
 149  {
 150   register real const cos0 = mp3lib_pnts[3][0];
 151   register real const cos1 = mp3lib_pnts[3][1];
 152
 153   b2[0x00] = b1[0x00] + b1[0x03];
 154   b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
 155   b2[0x01] = b1[0x01] + b1[0x02];
 156   b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
 157
 158   b2[0x04] = b1[0x04] + b1[0x07];
 159   b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
 160   b2[0x05] = b1[0x05] + b1[0x06];
 161   b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
 162
 163   b2[0x08] = b1[0x08] + b1[0x0B];
 164   b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
 165   b2[0x09] = b1[0x09] + b1[0x0A];
 166   b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
 167
 168   b2[0x0C] = b1[0x0C] + b1[0x0F];
 169   b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
 170   b2[0x0D] = b1[0x0D] + b1[0x0E];
 171   b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
 172
 173   b2[0x10] = b1[0x10] + b1[0x13];
 174   b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
 175   b2[0x11] = b1[0x11] + b1[0x12];
 176   b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
 177
 178   b2[0x14] = b1[0x14] + b1[0x17];
 179   b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
 180   b2[0x15] = b1[0x15] + b1[0x16];
 181   b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
 182
 183   b2[0x18] = b1[0x18] + b1[0x1B];
 184   b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
 185   b2[0x19] = b1[0x19] + b1[0x1A];
 186   b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
 187
 188   b2[0x1C] = b1[0x1C] + b1[0x1F];
 189   b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
 190   b2[0x1D] = b1[0x1D] + b1[0x1E];
 191   b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
 192  }
 193
 194  {
 195   register real const cos0 = mp3lib_pnts[4][0];
 196
 197   b1[0x00] = b2[0x00] + b2[0x01];
 198   b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
 199   b1[0x02] = b2[0x02] + b2[0x03];
 200   b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
 201   b1[0x02] += b1[0x03];
 202
 203   b1[0x04] = b2[0x04] + b2[0x05];
 204   b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
 205   b1[0x06] = b2[0x06] + b2[0x07];
 206   b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
 207   b1[0x06] += b1[0x07];
 208   b1[0x04] += b1[0x06];
 209   b1[0x06] += b1[0x05];
 210   b1[0x05] += b1[0x07];
 211
 212   b1[0x08] = b2[0x08] + b2[0x09];
 213   b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
 214   b1[0x0A] = b2[0x0A] + b2[0x0B];
 215   b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
 216   b1[0x0A] += b1[0x0B];
 217
 218   b1[0x0C] = b2[0x0C] + b2[0x0D];
 219   b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
 220   b1[0x0E] = b2[0x0E] + b2[0x0F];
 221   b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
 222   b1[0x0E] += b1[0x0F];
 223   b1[0x0C] += b1[0x0E];
 224   b1[0x0E] += b1[0x0D];
 225   b1[0x0D] += b1[0x0F];
 226
 227   b1[0x10] = b2[0x10] + b2[0x11];
 228   b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
 229   b1[0x12] = b2[0x12] + b2[0x13];
 230   b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
 231   b1[0x12] += b1[0x13];
 232
 233   b1[0x14] = b2[0x14] + b2[0x15];
 234   b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
 235   b1[0x16] = b2[0x16] + b2[0x17];
 236   b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
 237   b1[0x16] += b1[0x17];
 238   b1[0x14] += b1[0x16];
 239   b1[0x16] += b1[0x15];
 240   b1[0x15] += b1[0x17];
 241
 242   b1[0x18] = b2[0x18] + b2[0x19];
 243   b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
 244   b1[0x1A] = b2[0x1A] + b2[0x1B];
 245   b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
 246   b1[0x1A] += b1[0x1B];
 247
 248   b1[0x1C] = b2[0x1C] + b2[0x1D];
 249   b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
 250   b1[0x1E] = b2[0x1E] + b2[0x1F];
 251   b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
 252   b1[0x1E] += b1[0x1F];
 253   b1[0x1C] += b1[0x1E];
 254   b1[0x1E] += b1[0x1D];
 255   b1[0x1D] += b1[0x1F];
 256  }
 257
 258  out0[0x10*16] = b1[0x00];
 259  out0[0x10*12] = b1[0x04];
 260  out0[0x10* 8] = b1[0x02];
 261  out0[0x10* 4] = b1[0x06];
 262  out0[0x10* 0] = b1[0x01];
 263  out1[0x10* 0] = b1[0x01];
 264  out1[0x10* 4] = b1[0x05];
 265  out1[0x10* 8] = b1[0x03];
 266  out1[0x10*12] = b1[0x07];
 267
 268  b1[0x08] += b1[0x0C];
 269  out0[0x10*14] = b1[0x08];
 270  b1[0x0C] += b1[0x0a];
 271  out0[0x10*10] = b1[0x0C];
 272  b1[0x0A] += b1[0x0E];
 273  out0[0x10* 6] = b1[0x0A];
 274  b1[0x0E] += b1[0x09];
 275  out0[0x10* 2] = b1[0x0E];
 276  b1[0x09] += b1[0x0D];
 277  out1[0x10* 2] = b1[0x09];
 278  b1[0x0D] += b1[0x0B];
 279  out1[0x10* 6] = b1[0x0D];
 280  b1[0x0B] += b1[0x0F];
 281  out1[0x10*10] = b1[0x0B];
 282  out1[0x10*14] = b1[0x0F];
 283
 284  b1[0x18] += b1[0x1C];
 285  out0[0x10*15] = b1[0x10] + b1[0x18];
 286  out0[0x10*13] = b1[0x18] + b1[0x14];
 287  b1[0x1C] += b1[0x1a];
 288  out0[0x10*11] = b1[0x14] + b1[0x1C];
 289  out0[0x10* 9] = b1[0x1C] + b1[0x12];
 290  b1[0x1A] += b1[0x1E];
 291  out0[0x10* 7] = b1[0x12] + b1[0x1A];
 292  out0[0x10* 5] = b1[0x1A] + b1[0x16];
 293  b1[0x1E] += b1[0x19];
 294  out0[0x10* 3] = b1[0x16] + b1[0x1E];
 295  out0[0x10* 1] = b1[0x1E] + b1[0x11];
 296  b1[0x19] += b1[0x1D];
 297  out1[0x10* 1] = b1[0x11] + b1[0x19];
 298  out1[0x10* 3] = b1[0x19] + b1[0x15];
 299  b1[0x1D] += b1[0x1B];
 300  out1[0x10* 5] = b1[0x15] + b1[0x1D];
 301  out1[0x10* 7] = b1[0x1D] + b1[0x13];
 302  b1[0x1B] += b1[0x1F];
 303  out1[0x10* 9] = b1[0x13] + b1[0x1B];
 304  out1[0x10*11] = b1[0x1B] + b1[0x17];
 305  out1[0x10*13] = b1[0x17] + b1[0x1F];
 306  out1[0x10*15] = b1[0x1F];
 307 }
 308
 309 /*
 310  * the call via dct64 is a trick to force GCC to use
 311  * (new) registers for the b1,b2 pointer to the bufs[xx] field
 312  */
 313 static void dct64(real *a,real *b,real *c)
 314 {
 315   real bufs[0x40];
 316   dct64_1(a,b,bufs,bufs+0x20,c);
 317 }
 318
 319 void mp3lib_dct64(real *a,real *b,real *c)
 320 {
 321   real bufs[0x40];
 322   dct64_1(a,b,bufs,bufs+0x20,c);
 323 }