| /* | |
| * Copyright (c) Michael Hipp and other authors of the mpglib project. | |
| * | |
| * Discrete Cosine Tansform (DCT) for subband synthesis | |
| * optimized for machines with no auto-increment. | |
| * The performance is highly compiler dependend. Maybe | |
| * the dct64.c version for 'normal' processor may be faster | |
| * even for Intel processors. | |
| * | |
| * This library is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU Lesser General Public | |
| * License as published by the Free Software Foundation; either | |
| * version 2.1 of the License, or (at your option) any later version. | |
| * | |
| * This library is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| * Lesser General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU Lesser General Public | |
| * License along with this library; if not, write to the Free Software | |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| */ | |
| #include "mpg123.h" | |
| static void dct64_1(real *out0,real *out1,real *b1,real *b2,real *samples) | |
| { | |
| { | |
| register real *costab = pnts[0]; | |
| b1[0x00] = samples[0x00] + samples[0x1F]; | |
| b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0]; | |
| b1[0x01] = samples[0x01] + samples[0x1E]; | |
| b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1]; | |
| b1[0x02] = samples[0x02] + samples[0x1D]; | |
| b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2]; | |
| b1[0x03] = samples[0x03] + samples[0x1C]; | |
| b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3]; | |
| b1[0x04] = samples[0x04] + samples[0x1B]; | |
| b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4]; | |
| b1[0x05] = samples[0x05] + samples[0x1A]; | |
| b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5]; | |
| b1[0x06] = samples[0x06] + samples[0x19]; | |
| b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6]; | |
| b1[0x07] = samples[0x07] + samples[0x18]; | |
| b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7]; | |
| b1[0x08] = samples[0x08] + samples[0x17]; | |
| b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8]; | |
| b1[0x09] = samples[0x09] + samples[0x16]; | |
| b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9]; | |
| b1[0x0A] = samples[0x0A] + samples[0x15]; | |
| b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA]; | |
| b1[0x0B] = samples[0x0B] + samples[0x14]; | |
| b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB]; | |
| b1[0x0C] = samples[0x0C] + samples[0x13]; | |
| b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC]; | |
| b1[0x0D] = samples[0x0D] + samples[0x12]; | |
| b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD]; | |
| b1[0x0E] = samples[0x0E] + samples[0x11]; | |
| b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE]; | |
| b1[0x0F] = samples[0x0F] + samples[0x10]; | |
| b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF]; | |
| } | |
| { | |
| register real *costab = pnts[1]; | |
| b2[0x00] = b1[0x00] + b1[0x0F]; | |
| b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0]; | |
| b2[0x01] = b1[0x01] + b1[0x0E]; | |
| b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1]; | |
| b2[0x02] = b1[0x02] + b1[0x0D]; | |
| b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2]; | |
| b2[0x03] = b1[0x03] + b1[0x0C]; | |
| b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3]; | |
| b2[0x04] = b1[0x04] + b1[0x0B]; | |
| b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4]; | |
| b2[0x05] = b1[0x05] + b1[0x0A]; | |
| b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5]; | |
| b2[0x06] = b1[0x06] + b1[0x09]; | |
| b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6]; | |
| b2[0x07] = b1[0x07] + b1[0x08]; | |
| b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7]; | |
| b2[0x10] = b1[0x10] + b1[0x1F]; | |
| b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0]; | |
| b2[0x11] = b1[0x11] + b1[0x1E]; | |
| b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1]; | |
| b2[0x12] = b1[0x12] + b1[0x1D]; | |
| b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2]; | |
| b2[0x13] = b1[0x13] + b1[0x1C]; | |
| b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3]; | |
| b2[0x14] = b1[0x14] + b1[0x1B]; | |
| b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4]; | |
| b2[0x15] = b1[0x15] + b1[0x1A]; | |
| b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5]; | |
| b2[0x16] = b1[0x16] + b1[0x19]; | |
| b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6]; | |
| b2[0x17] = b1[0x17] + b1[0x18]; | |
| b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7]; | |
| } | |
| { | |
| register real *costab = pnts[2]; | |
| b1[0x00] = b2[0x00] + b2[0x07]; | |
| b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0]; | |
| b1[0x01] = b2[0x01] + b2[0x06]; | |
| b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1]; | |
| b1[0x02] = b2[0x02] + b2[0x05]; | |
| b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2]; | |
| b1[0x03] = b2[0x03] + b2[0x04]; | |
| b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3]; | |
| b1[0x08] = b2[0x08] + b2[0x0F]; | |
| b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0]; | |
| b1[0x09] = b2[0x09] + b2[0x0E]; | |
| b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1]; | |
| b1[0x0A] = b2[0x0A] + b2[0x0D]; | |
| b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2]; | |
| b1[0x0B] = b2[0x0B] + b2[0x0C]; | |
| b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3]; | |
| b1[0x10] = b2[0x10] + b2[0x17]; | |
| b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0]; | |
| b1[0x11] = b2[0x11] + b2[0x16]; | |
| b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1]; | |
| b1[0x12] = b2[0x12] + b2[0x15]; | |
| b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2]; | |
| b1[0x13] = b2[0x13] + b2[0x14]; | |
| b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3]; | |
| b1[0x18] = b2[0x18] + b2[0x1F]; | |
| b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0]; | |
| b1[0x19] = b2[0x19] + b2[0x1E]; | |
| b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1]; | |
| b1[0x1A] = b2[0x1A] + b2[0x1D]; | |
| b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2]; | |
| b1[0x1B] = b2[0x1B] + b2[0x1C]; | |
| b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3]; | |
| } | |
| { | |
| register real const cos0 = pnts[3][0]; | |
| register real const cos1 = pnts[3][1]; | |
| b2[0x00] = b1[0x00] + b1[0x03]; | |
| b2[0x03] = (b1[0x00] - b1[0x03]) * cos0; | |
| b2[0x01] = b1[0x01] + b1[0x02]; | |
| b2[0x02] = (b1[0x01] - b1[0x02]) * cos1; | |
| b2[0x04] = b1[0x04] + b1[0x07]; | |
| b2[0x07] = (b1[0x07] - b1[0x04]) * cos0; | |
| b2[0x05] = b1[0x05] + b1[0x06]; | |
| b2[0x06] = (b1[0x06] - b1[0x05]) * cos1; | |
| b2[0x08] = b1[0x08] + b1[0x0B]; | |
| b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0; | |
| b2[0x09] = b1[0x09] + b1[0x0A]; | |
| b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1; | |
| b2[0x0C] = b1[0x0C] + b1[0x0F]; | |
| b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0; | |
| b2[0x0D] = b1[0x0D] + b1[0x0E]; | |
| b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1; | |
| b2[0x10] = b1[0x10] + b1[0x13]; | |
| b2[0x13] = (b1[0x10] - b1[0x13]) * cos0; | |
| b2[0x11] = b1[0x11] + b1[0x12]; | |
| b2[0x12] = (b1[0x11] - b1[0x12]) * cos1; | |
| b2[0x14] = b1[0x14] + b1[0x17]; | |
| b2[0x17] = (b1[0x17] - b1[0x14]) * cos0; | |
| b2[0x15] = b1[0x15] + b1[0x16]; | |
| b2[0x16] = (b1[0x16] - b1[0x15]) * cos1; | |
| b2[0x18] = b1[0x18] + b1[0x1B]; | |
| b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0; | |
| b2[0x19] = b1[0x19] + b1[0x1A]; | |
| b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1; | |
| b2[0x1C] = b1[0x1C] + b1[0x1F]; | |
| b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0; | |
| b2[0x1D] = b1[0x1D] + b1[0x1E]; | |
| b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1; | |
| } | |
| { | |
| register real const cos0 = pnts[4][0]; | |
| b1[0x00] = b2[0x00] + b2[0x01]; | |
| b1[0x01] = (b2[0x00] - b2[0x01]) * cos0; | |
| b1[0x02] = b2[0x02] + b2[0x03]; | |
| b1[0x03] = (b2[0x03] - b2[0x02]) * cos0; | |
| b1[0x02] += b1[0x03]; | |
| b1[0x04] = b2[0x04] + b2[0x05]; | |
| b1[0x05] = (b2[0x04] - b2[0x05]) * cos0; | |
| b1[0x06] = b2[0x06] + b2[0x07]; | |
| b1[0x07] = (b2[0x07] - b2[0x06]) * cos0; | |
| b1[0x06] += b1[0x07]; | |
| b1[0x04] += b1[0x06]; | |
| b1[0x06] += b1[0x05]; | |
| b1[0x05] += b1[0x07]; | |
| b1[0x08] = b2[0x08] + b2[0x09]; | |
| b1[0x09] = (b2[0x08] - b2[0x09]) * cos0; | |
| b1[0x0A] = b2[0x0A] + b2[0x0B]; | |
| b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0; | |
| b1[0x0A] += b1[0x0B]; | |
| b1[0x0C] = b2[0x0C] + b2[0x0D]; | |
| b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0; | |
| b1[0x0E] = b2[0x0E] + b2[0x0F]; | |
| b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0; | |
| b1[0x0E] += b1[0x0F]; | |
| b1[0x0C] += b1[0x0E]; | |
| b1[0x0E] += b1[0x0D]; | |
| b1[0x0D] += b1[0x0F]; | |
| b1[0x10] = b2[0x10] + b2[0x11]; | |
| b1[0x11] = (b2[0x10] - b2[0x11]) * cos0; | |
| b1[0x12] = b2[0x12] + b2[0x13]; | |
| b1[0x13] = (b2[0x13] - b2[0x12]) * cos0; | |
| b1[0x12] += b1[0x13]; | |
| b1[0x14] = b2[0x14] + b2[0x15]; | |
| b1[0x15] = (b2[0x14] - b2[0x15]) * cos0; | |
| b1[0x16] = b2[0x16] + b2[0x17]; | |
| b1[0x17] = (b2[0x17] - b2[0x16]) * cos0; | |
| b1[0x16] += b1[0x17]; | |
| b1[0x14] += b1[0x16]; | |
| b1[0x16] += b1[0x15]; | |
| b1[0x15] += b1[0x17]; | |
| b1[0x18] = b2[0x18] + b2[0x19]; | |
| b1[0x19] = (b2[0x18] - b2[0x19]) * cos0; | |
| b1[0x1A] = b2[0x1A] + b2[0x1B]; | |
| b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0; | |
| b1[0x1A] += b1[0x1B]; | |
| b1[0x1C] = b2[0x1C] + b2[0x1D]; | |
| b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0; | |
| b1[0x1E] = b2[0x1E] + b2[0x1F]; | |
| b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0; | |
| b1[0x1E] += b1[0x1F]; | |
| b1[0x1C] += b1[0x1E]; | |
| b1[0x1E] += b1[0x1D]; | |
| b1[0x1D] += b1[0x1F]; | |
| } | |
| out0[0x10*16] = b1[0x00]; | |
| out0[0x10*12] = b1[0x04]; | |
| out0[0x10* 8] = b1[0x02]; | |
| out0[0x10* 4] = b1[0x06]; | |
| out0[0x10* 0] = b1[0x01]; | |
| out1[0x10* 0] = b1[0x01]; | |
| out1[0x10* 4] = b1[0x05]; | |
| out1[0x10* 8] = b1[0x03]; | |
| out1[0x10*12] = b1[0x07]; | |
| b1[0x08] += b1[0x0C]; | |
| out0[0x10*14] = b1[0x08]; | |
| b1[0x0C] += b1[0x0a]; | |
| out0[0x10*10] = b1[0x0C]; | |
| b1[0x0A] += b1[0x0E]; | |
| out0[0x10* 6] = b1[0x0A]; | |
| b1[0x0E] += b1[0x09]; | |
| out0[0x10* 2] = b1[0x0E]; | |
| b1[0x09] += b1[0x0D]; | |
| out1[0x10* 2] = b1[0x09]; | |
| b1[0x0D] += b1[0x0B]; | |
| out1[0x10* 6] = b1[0x0D]; | |
| b1[0x0B] += b1[0x0F]; | |
| out1[0x10*10] = b1[0x0B]; | |
| out1[0x10*14] = b1[0x0F]; | |
| b1[0x18] += b1[0x1C]; | |
| out0[0x10*15] = b1[0x10] + b1[0x18]; | |
| out0[0x10*13] = b1[0x18] + b1[0x14]; | |
| b1[0x1C] += b1[0x1a]; | |
| out0[0x10*11] = b1[0x14] + b1[0x1C]; | |
| out0[0x10* 9] = b1[0x1C] + b1[0x12]; | |
| b1[0x1A] += b1[0x1E]; | |
| out0[0x10* 7] = b1[0x12] + b1[0x1A]; | |
| out0[0x10* 5] = b1[0x1A] + b1[0x16]; | |
| b1[0x1E] += b1[0x19]; | |
| out0[0x10* 3] = b1[0x16] + b1[0x1E]; | |
| out0[0x10* 1] = b1[0x1E] + b1[0x11]; | |
| b1[0x19] += b1[0x1D]; | |
| out1[0x10* 1] = b1[0x11] + b1[0x19]; | |
| out1[0x10* 3] = b1[0x19] + b1[0x15]; | |
| b1[0x1D] += b1[0x1B]; | |
| out1[0x10* 5] = b1[0x15] + b1[0x1D]; | |
| out1[0x10* 7] = b1[0x1D] + b1[0x13]; | |
| b1[0x1B] += b1[0x1F]; | |
| out1[0x10* 9] = b1[0x13] + b1[0x1B]; | |
| out1[0x10*11] = b1[0x1B] + b1[0x17]; | |
| out1[0x10*13] = b1[0x17] + b1[0x1F]; | |
| out1[0x10*15] = b1[0x1F]; | |
| } | |
| /* | |
| * the call via dct64 is a trick to force GCC to use | |
| * (new) registers for the b1,b2 pointer to the bufs[xx] field | |
| */ | |
| void dct64(real *a,real *b,real *c) | |
| { | |
| real bufs[0x40]; | |
| dct64_1(a,b,bufs,bufs+0x20,c); | |
| } |