You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
323 lines
8.9 KiB
323 lines
8.9 KiB
|
|
/* Discrete Cosine Tansform (DCT) for subband synthesis.
|
|
*
|
|
* This code is optimized for 80486. It should be compiled with gcc
|
|
* 2.7.2 or higher.
|
|
*
|
|
* Note: This code does not give the necessary accuracy. Moreover, no
|
|
* overflow test are done.
|
|
*
|
|
* (c) 1998 Fabrice Bellard.
|
|
*
|
|
* GPL clean
|
|
*/
|
|
|
|
#include "mpg123.h"
|
|
|
|
#define COS_0_0 16403
|
|
#define COS_0_1 16563
|
|
#define COS_0_2 16890
|
|
#define COS_0_3 17401
|
|
#define COS_0_4 18124
|
|
#define COS_0_5 19101
|
|
#define COS_0_6 20398
|
|
#define COS_0_7 22112
|
|
#define COS_0_8 24396
|
|
#define COS_0_9 27503
|
|
#define COS_0_10 31869
|
|
#define COS_0_11 38320
|
|
#define COS_0_12 48633
|
|
#define COS_0_13 67429
|
|
#define COS_0_14 111660
|
|
#define COS_0_15 333906
|
|
#define COS_1_0 16463
|
|
#define COS_1_1 17121
|
|
#define COS_1_2 18577
|
|
#define COS_1_3 21195
|
|
#define COS_1_4 25826
|
|
#define COS_1_5 34756
|
|
#define COS_1_6 56441
|
|
#define COS_1_7 167154
|
|
#define COS_2_0 16704
|
|
#define COS_2_1 19704
|
|
#define COS_2_2 29490
|
|
#define COS_2_3 83981
|
|
#define COS_3_0 17733
|
|
#define COS_3_1 42813
|
|
#define COS_4_0 23170
|
|
|
|
#define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr)
|
|
#define MUL(a,b) (((a)*(b)) >> 15)
|
|
#define MULL(a,b) (((long long)(a)*(long long)(b)) >> 15)
|
|
#ifdef REAL_IS_FIXED
|
|
#define TOINT(a) ((a) * 32768 / (int)REAL_FACTOR)
|
|
#else
|
|
#define TOINT(a) ((int)((a)*32768.0))
|
|
#endif
|
|
|
|
void dct64_1_486(int *out0,int *out1,int *b1,int *b2)
|
|
{
|
|
b1[0x00] = b2[0x00] + b2[0x1F];
|
|
b1[0x1F] = MUL((b2[0x00] - b2[0x1F]),COS_0_0);
|
|
|
|
b1[0x01] = b2[0x01] + b2[0x1E];
|
|
b1[0x1E] = MUL((b2[0x01] - b2[0x1E]),COS_0_1);
|
|
|
|
b1[0x02] = b2[0x02] + b2[0x1D];
|
|
b1[0x1D] = MUL((b2[0x02] - b2[0x1D]),COS_0_2);
|
|
|
|
b1[0x03] = b2[0x03] + b2[0x1C];
|
|
b1[0x1C] = MUL((b2[0x03] - b2[0x1C]),COS_0_3);
|
|
|
|
b1[0x04] = b2[0x04] + b2[0x1B];
|
|
b1[0x1B] = MUL((b2[0x04] - b2[0x1B]),COS_0_4);
|
|
|
|
b1[0x05] = b2[0x05] + b2[0x1A];
|
|
b1[0x1A] = MUL((b2[0x05] - b2[0x1A]),COS_0_5);
|
|
|
|
b1[0x06] = b2[0x06] + b2[0x19];
|
|
b1[0x19] = MUL((b2[0x06] - b2[0x19]),COS_0_6);
|
|
|
|
b1[0x07] = b2[0x07] + b2[0x18];
|
|
b1[0x18] = MUL((b2[0x07] - b2[0x18]),COS_0_7);
|
|
|
|
b1[0x08] = b2[0x08] + b2[0x17];
|
|
b1[0x17] = MUL((b2[0x08] - b2[0x17]),COS_0_8);
|
|
|
|
b1[0x09] = b2[0x09] + b2[0x16];
|
|
b1[0x16] = MUL((b2[0x09] - b2[0x16]),COS_0_9);
|
|
|
|
b1[0x0A] = b2[0x0A] + b2[0x15];
|
|
b1[0x15] = MUL((b2[0x0A] - b2[0x15]),COS_0_10);
|
|
|
|
b1[0x0B] = b2[0x0B] + b2[0x14];
|
|
b1[0x14] = MUL((b2[0x0B] - b2[0x14]),COS_0_11);
|
|
|
|
b1[0x0C] = b2[0x0C] + b2[0x13];
|
|
b1[0x13] = MUL((b2[0x0C] - b2[0x13]),COS_0_12);
|
|
|
|
b1[0x0D] = b2[0x0D] + b2[0x12];
|
|
b1[0x12] = MULL((b2[0x0D] - b2[0x12]),COS_0_13);
|
|
|
|
b1[0x0E] = b2[0x0E] + b2[0x11];
|
|
b1[0x11] = MULL((b2[0x0E] - b2[0x11]),COS_0_14);
|
|
|
|
b1[0x0F] = b2[0x0F] + b2[0x10];
|
|
b1[0x10] = MULL((b2[0x0F] - b2[0x10]),COS_0_15);
|
|
|
|
|
|
b2[0x00] = b1[0x00] + b1[0x0F];
|
|
b2[0x0F] = MUL((b1[0x00] - b1[0x0F]),COS_1_0);
|
|
b2[0x01] = b1[0x01] + b1[0x0E];
|
|
b2[0x0E] = MUL((b1[0x01] - b1[0x0E]),COS_1_1);
|
|
b2[0x02] = b1[0x02] + b1[0x0D];
|
|
b2[0x0D] = MUL((b1[0x02] - b1[0x0D]),COS_1_2);
|
|
b2[0x03] = b1[0x03] + b1[0x0C];
|
|
b2[0x0C] = MUL((b1[0x03] - b1[0x0C]),COS_1_3);
|
|
b2[0x04] = b1[0x04] + b1[0x0B];
|
|
b2[0x0B] = MUL((b1[0x04] - b1[0x0B]),COS_1_4);
|
|
b2[0x05] = b1[0x05] + b1[0x0A];
|
|
b2[0x0A] = MUL((b1[0x05] - b1[0x0A]),COS_1_5);
|
|
b2[0x06] = b1[0x06] + b1[0x09];
|
|
b2[0x09] = MUL((b1[0x06] - b1[0x09]),COS_1_6);
|
|
b2[0x07] = b1[0x07] + b1[0x08];
|
|
b2[0x08] = MULL((b1[0x07] - b1[0x08]),COS_1_7);
|
|
|
|
b2[0x10] = b1[0x10] + b1[0x1F];
|
|
b2[0x1F] = MUL((b1[0x1F] - b1[0x10]),COS_1_0);
|
|
b2[0x11] = b1[0x11] + b1[0x1E];
|
|
b2[0x1E] = MUL((b1[0x1E] - b1[0x11]),COS_1_1);
|
|
b2[0x12] = b1[0x12] + b1[0x1D];
|
|
b2[0x1D] = MUL((b1[0x1D] - b1[0x12]),COS_1_2);
|
|
b2[0x13] = b1[0x13] + b1[0x1C];
|
|
b2[0x1C] = MUL((b1[0x1C] - b1[0x13]),COS_1_3);
|
|
b2[0x14] = b1[0x14] + b1[0x1B];
|
|
b2[0x1B] = MUL((b1[0x1B] - b1[0x14]),COS_1_4);
|
|
b2[0x15] = b1[0x15] + b1[0x1A];
|
|
b2[0x1A] = MUL((b1[0x1A] - b1[0x15]),COS_1_5);
|
|
b2[0x16] = b1[0x16] + b1[0x19];
|
|
b2[0x19] = MUL((b1[0x19] - b1[0x16]),COS_1_6);
|
|
b2[0x17] = b1[0x17] + b1[0x18];
|
|
b2[0x18] = MULL((b1[0x18] - b1[0x17]),COS_1_7);
|
|
|
|
|
|
b1[0x00] = b2[0x00] + b2[0x07];
|
|
b1[0x07] = MUL((b2[0x00] - b2[0x07]),COS_2_0);
|
|
b1[0x01] = b2[0x01] + b2[0x06];
|
|
b1[0x06] = MUL((b2[0x01] - b2[0x06]),COS_2_1);
|
|
b1[0x02] = b2[0x02] + b2[0x05];
|
|
b1[0x05] = MUL((b2[0x02] - b2[0x05]),COS_2_2);
|
|
b1[0x03] = b2[0x03] + b2[0x04];
|
|
b1[0x04] = MULL((b2[0x03] - b2[0x04]),COS_2_3);
|
|
|
|
b1[0x08] = b2[0x08] + b2[0x0F];
|
|
b1[0x0F] = MUL((b2[0x0F] - b2[0x08]),COS_2_0);
|
|
b1[0x09] = b2[0x09] + b2[0x0E];
|
|
b1[0x0E] = MUL((b2[0x0E] - b2[0x09]),COS_2_1);
|
|
b1[0x0A] = b2[0x0A] + b2[0x0D];
|
|
b1[0x0D] = MUL((b2[0x0D] - b2[0x0A]),COS_2_2);
|
|
b1[0x0B] = b2[0x0B] + b2[0x0C];
|
|
b1[0x0C] = MULL((b2[0x0C] - b2[0x0B]),COS_2_3);
|
|
|
|
b1[0x10] = b2[0x10] + b2[0x17];
|
|
b1[0x17] = MUL((b2[0x10] - b2[0x17]),COS_2_0);
|
|
b1[0x11] = b2[0x11] + b2[0x16];
|
|
b1[0x16] = MUL((b2[0x11] - b2[0x16]),COS_2_1);
|
|
b1[0x12] = b2[0x12] + b2[0x15];
|
|
b1[0x15] = MUL((b2[0x12] - b2[0x15]),COS_2_2);
|
|
b1[0x13] = b2[0x13] + b2[0x14];
|
|
b1[0x14] = MULL((b2[0x13] - b2[0x14]),COS_2_3);
|
|
|
|
b1[0x18] = b2[0x18] + b2[0x1F];
|
|
b1[0x1F] = MUL((b2[0x1F] - b2[0x18]),COS_2_0);
|
|
b1[0x19] = b2[0x19] + b2[0x1E];
|
|
b1[0x1E] = MUL((b2[0x1E] - b2[0x19]),COS_2_1);
|
|
b1[0x1A] = b2[0x1A] + b2[0x1D];
|
|
b1[0x1D] = MUL((b2[0x1D] - b2[0x1A]),COS_2_2);
|
|
b1[0x1B] = b2[0x1B] + b2[0x1C];
|
|
b1[0x1C] = MULL((b2[0x1C] - b2[0x1B]),COS_2_3);
|
|
|
|
|
|
b2[0x00] = b1[0x00] + b1[0x03];
|
|
b2[0x03] = MUL((b1[0x00] - b1[0x03]),COS_3_0);
|
|
b2[0x01] = b1[0x01] + b1[0x02];
|
|
b2[0x02] = MUL((b1[0x01] - b1[0x02]),COS_3_1);
|
|
|
|
b2[0x04] = b1[0x04] + b1[0x07];
|
|
b2[0x07] = MUL((b1[0x07] - b1[0x04]),COS_3_0);
|
|
b2[0x05] = b1[0x05] + b1[0x06];
|
|
b2[0x06] = MUL((b1[0x06] - b1[0x05]),COS_3_1);
|
|
|
|
b2[0x08] = b1[0x08] + b1[0x0B];
|
|
b2[0x0B] = MUL((b1[0x08] - b1[0x0B]),COS_3_0);
|
|
b2[0x09] = b1[0x09] + b1[0x0A];
|
|
b2[0x0A] = MUL((b1[0x09] - b1[0x0A]),COS_3_1);
|
|
|
|
b2[0x0C] = b1[0x0C] + b1[0x0F];
|
|
b2[0x0F] = MUL((b1[0x0F] - b1[0x0C]),COS_3_0);
|
|
b2[0x0D] = b1[0x0D] + b1[0x0E];
|
|
b2[0x0E] = MUL((b1[0x0E] - b1[0x0D]),COS_3_1);
|
|
|
|
b2[0x10] = b1[0x10] + b1[0x13];
|
|
b2[0x13] = MUL((b1[0x10] - b1[0x13]),COS_3_0);
|
|
b2[0x11] = b1[0x11] + b1[0x12];
|
|
b2[0x12] = MUL((b1[0x11] - b1[0x12]),COS_3_1);
|
|
|
|
b2[0x14] = b1[0x14] + b1[0x17];
|
|
b2[0x17] = MUL((b1[0x17] - b1[0x14]),COS_3_0);
|
|
b2[0x15] = b1[0x15] + b1[0x16];
|
|
b2[0x16] = MUL((b1[0x16] - b1[0x15]),COS_3_1);
|
|
|
|
b2[0x18] = b1[0x18] + b1[0x1B];
|
|
b2[0x1B] = MUL((b1[0x18] - b1[0x1B]),COS_3_0);
|
|
b2[0x19] = b1[0x19] + b1[0x1A];
|
|
b2[0x1A] = MUL((b1[0x19] - b1[0x1A]),COS_3_1);
|
|
|
|
b2[0x1C] = b1[0x1C] + b1[0x1F];
|
|
b2[0x1F] = MUL((b1[0x1F] - b1[0x1C]),COS_3_0);
|
|
b2[0x1D] = b1[0x1D] + b1[0x1E];
|
|
b2[0x1E] = MUL((b1[0x1E] - b1[0x1D]),COS_3_1);
|
|
|
|
{
|
|
int i;
|
|
for(i=0;i<32;i+=4) {
|
|
b1[i+0x00] = b2[i+0x00] + b2[i+0x01];
|
|
b1[i+0x01] = MUL((b2[i+0x00] - b2[i+0x01]),COS_4_0);
|
|
b1[i+0x02] = b2[i+0x02] + b2[i+0x03];
|
|
b1[i+0x03] = MUL((b2[i+0x03] - b2[i+0x02]),COS_4_0);
|
|
}
|
|
}
|
|
|
|
b1[0x02] += b1[0x03];
|
|
b1[0x06] += b1[0x07];
|
|
b1[0x04] += b1[0x06];
|
|
b1[0x06] += b1[0x05];
|
|
b1[0x05] += b1[0x07];
|
|
|
|
b1[0x0A] += b1[0x0B];
|
|
b1[0x0E] += b1[0x0F];
|
|
b1[0x0C] += b1[0x0E];
|
|
b1[0x0E] += b1[0x0D];
|
|
b1[0x0D] += b1[0x0F];
|
|
|
|
b1[0x12] += b1[0x13];
|
|
b1[0x16] += b1[0x17];
|
|
b1[0x14] += b1[0x16];
|
|
b1[0x16] += b1[0x15];
|
|
b1[0x15] += b1[0x17];
|
|
|
|
b1[0x1A] += b1[0x1B];
|
|
b1[0x1E] += b1[0x1F];
|
|
b1[0x1C] += b1[0x1E];
|
|
b1[0x1E] += b1[0x1D];
|
|
b1[0x1D] += b1[0x1F];
|
|
|
|
SETOUT(out0,16,b1[0x00]);
|
|
SETOUT(out0,12,b1[0x04]);
|
|
SETOUT(out0, 8,b1[0x02]);
|
|
SETOUT(out0, 4,b1[0x06]);
|
|
SETOUT(out0, 0,b1[0x01]);
|
|
SETOUT(out1, 0,b1[0x01]);
|
|
SETOUT(out1, 4,b1[0x05]);
|
|
SETOUT(out1, 8,b1[0x03]);
|
|
SETOUT(out1,12,b1[0x07]);
|
|
|
|
b1[0x08] += b1[0x0C];
|
|
SETOUT(out0,14,b1[0x08]);
|
|
b1[0x0C] += b1[0x0a];
|
|
SETOUT(out0,10,b1[0x0C]);
|
|
b1[0x0A] += b1[0x0E];
|
|
SETOUT(out0, 6,b1[0x0A]);
|
|
b1[0x0E] += b1[0x09];
|
|
SETOUT(out0, 2,b1[0x0E]);
|
|
b1[0x09] += b1[0x0D];
|
|
SETOUT(out1, 2,b1[0x09]);
|
|
b1[0x0D] += b1[0x0B];
|
|
SETOUT(out1, 6,b1[0x0D]);
|
|
b1[0x0B] += b1[0x0F];
|
|
SETOUT(out1,10,b1[0x0B]);
|
|
SETOUT(out1,14,b1[0x0F]);
|
|
|
|
b1[0x18] += b1[0x1C];
|
|
SETOUT(out0,15,b1[0x10] + b1[0x18]);
|
|
SETOUT(out0,13,b1[0x18] + b1[0x14]);
|
|
b1[0x1C] += b1[0x1a];
|
|
SETOUT(out0,11,b1[0x14] + b1[0x1C]);
|
|
SETOUT(out0, 9,b1[0x1C] + b1[0x12]);
|
|
b1[0x1A] += b1[0x1E];
|
|
SETOUT(out0, 7,b1[0x12] + b1[0x1A]);
|
|
SETOUT(out0, 5,b1[0x1A] + b1[0x16]);
|
|
b1[0x1E] += b1[0x19];
|
|
SETOUT(out0, 3,b1[0x16] + b1[0x1E]);
|
|
SETOUT(out0, 1,b1[0x1E] + b1[0x11]);
|
|
b1[0x19] += b1[0x1D];
|
|
SETOUT(out1, 1,b1[0x11] + b1[0x19]);
|
|
SETOUT(out1, 3,b1[0x19] + b1[0x15]);
|
|
b1[0x1D] += b1[0x1B];
|
|
SETOUT(out1, 5,b1[0x15] + b1[0x1D]);
|
|
SETOUT(out1, 7,b1[0x1D] + b1[0x13]);
|
|
b1[0x1B] += b1[0x1F];
|
|
SETOUT(out1, 9,b1[0x13] + b1[0x1B]);
|
|
SETOUT(out1,11,b1[0x1B] + b1[0x17]);
|
|
SETOUT(out1,13,b1[0x17] + b1[0x1F]);
|
|
SETOUT(out1,15,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_486(int *a,int *b,real *samples)
|
|
{
|
|
int bufs[64];
|
|
int i;
|
|
|
|
for(i=0;i<32;i++) {
|
|
bufs[i+32]=TOINT(samples[i]);
|
|
}
|
|
|
|
dct64_1_486(a,b,bufs,bufs+0x20);
|
|
}
|
|
|