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.
141 lines
3.3 KiB
141 lines
3.3 KiB
15 years ago
|
/* 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.
|
||
|
|
*
|
||
|
|
* Rewrite to asm with algorithm and memory optimization
|
||
|
|
*
|
||
|
|
* (c) 2000 Petr Salinger
|
||
|
|
*
|
||
|
|
* 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)
|
||
|
|
#define TOINT(a) ((int)((a)*32768.0))
|
||
|
|
|
||
|
|
void dct64_1_486_a(real *samples, int *bx);
|
||
|
|
|
||
|
|
void dct64_1_486_b(int *out0, int *out1, int *b1)
|
||
|
|
{
|
||
|
|
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]);
|
||
|
|
|
||
|
|
SETOUT(out0,14, b1[0x08] + b1[0x0C]);
|
||
|
|
SETOUT(out0,10, b1[0x0C] + b1[0x0A]);
|
||
|
|
SETOUT(out0, 6, b1[0x0A] + b1[0x0E]);
|
||
|
|
SETOUT(out0, 2, b1[0x0E] + b1[0x09]);
|
||
|
|
SETOUT(out1, 2, b1[0x09] + b1[0x0D]);
|
||
|
|
SETOUT(out1, 6, b1[0x0D] + b1[0x0B]);
|
||
|
|
SETOUT(out1,10, b1[0x0B] + b1[0x0F]);
|
||
|
|
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]);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* main DCT function
|
||
|
|
*/
|
||
|
|
void dct64_486(int *a,int *b,real *samples)
|
||
|
|
{
|
||
|
|
int bufs[33]; /* 32 + 1 extra for 8B store from x87 */
|
||
|
|
|
||
|
|
dct64_1_486_a(samples,bufs);
|
||
|
|
dct64_1_486_b(a,b,bufs);
|
||
|
|
}
|
||
|
|
|