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141 lines
3.3 KiB
141 lines
3.3 KiB
/* Discrete Cosine Tansform (DCT) for subband synthesis.
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*
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* This code is optimized for 80486. It should be compiled with gcc
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* 2.7.2 or higher.
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*
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* Note: This code does not give the necessary accuracy. Moreover, no
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* overflow test are done.
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*
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* (c) 1998 Fabrice Bellard.
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*
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* Rewrite to asm with algorithm and memory optimization
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*
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* (c) 2000 Petr Salinger
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*
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* GPL clean
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*
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*/
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#include "mpg123.h"
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#define COS_0_0 16403
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#define COS_0_1 16563
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#define COS_0_2 16890
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#define COS_0_3 17401
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#define COS_0_4 18124
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#define COS_0_5 19101
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#define COS_0_6 20398
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#define COS_0_7 22112
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#define COS_0_8 24396
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#define COS_0_9 27503
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#define COS_0_10 31869
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#define COS_0_11 38320
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#define COS_0_12 48633
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#define COS_0_13 67429
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#define COS_0_14 111660
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#define COS_0_15 333906
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#define COS_1_0 16463
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#define COS_1_1 17121
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#define COS_1_2 18577
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#define COS_1_3 21195
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#define COS_1_4 25826
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#define COS_1_5 34756
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#define COS_1_6 56441
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#define COS_1_7 167154
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#define COS_2_0 16704
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#define COS_2_1 19704
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#define COS_2_2 29490
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#define COS_2_3 83981
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#define COS_3_0 17733
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#define COS_3_1 42813
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#define COS_4_0 23170
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#define SETOUT(out,n,expr) out[FIR_BUFFER_SIZE*(n)]=(expr)
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#define MUL(a,b) (((a)*(b)) >> 15)
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#define MULL(a,b) (((long long)(a)*(long long)(b)) >> 15)
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#define TOINT(a) ((int)((a)*32768.0))
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void dct64_1_486_a(real *samples, int *bx);
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void dct64_1_486_b(int *out0, int *out1, int *b1)
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{
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b1[0x02] += b1[0x03];
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b1[0x06] += b1[0x07];
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b1[0x04] += b1[0x06];
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b1[0x06] += b1[0x05];
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b1[0x05] += b1[0x07];
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b1[0x0A] += b1[0x0B];
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b1[0x0E] += b1[0x0F];
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b1[0x0C] += b1[0x0E];
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b1[0x0E] += b1[0x0D];
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b1[0x0D] += b1[0x0F];
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b1[0x12] += b1[0x13];
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b1[0x16] += b1[0x17];
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b1[0x14] += b1[0x16];
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b1[0x16] += b1[0x15];
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b1[0x15] += b1[0x17];
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b1[0x1A] += b1[0x1B];
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b1[0x1E] += b1[0x1F];
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b1[0x1C] += b1[0x1E];
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b1[0x1E] += b1[0x1D];
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b1[0x1D] += b1[0x1F];
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SETOUT(out0,16,b1[0x00]);
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SETOUT(out0,12,b1[0x04]);
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SETOUT(out0, 8,b1[0x02]);
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SETOUT(out0, 4,b1[0x06]);
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SETOUT(out0, 0,b1[0x01]);
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SETOUT(out1, 0,b1[0x01]);
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SETOUT(out1, 4,b1[0x05]);
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SETOUT(out1, 8,b1[0x03]);
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SETOUT(out1,12,b1[0x07]);
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SETOUT(out0,14, b1[0x08] + b1[0x0C]);
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SETOUT(out0,10, b1[0x0C] + b1[0x0A]);
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SETOUT(out0, 6, b1[0x0A] + b1[0x0E]);
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SETOUT(out0, 2, b1[0x0E] + b1[0x09]);
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SETOUT(out1, 2, b1[0x09] + b1[0x0D]);
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SETOUT(out1, 6, b1[0x0D] + b1[0x0B]);
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SETOUT(out1,10, b1[0x0B] + b1[0x0F]);
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SETOUT(out1,14, b1[0x0F]);
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b1[0x18] += b1[0x1C];
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SETOUT(out0,15,b1[0x10] + b1[0x18]);
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SETOUT(out0,13,b1[0x18] + b1[0x14]);
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b1[0x1C] += b1[0x1a];
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SETOUT(out0,11,b1[0x14] + b1[0x1C]);
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SETOUT(out0, 9,b1[0x1C] + b1[0x12]);
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b1[0x1A] += b1[0x1E];
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SETOUT(out0, 7,b1[0x12] + b1[0x1A]);
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SETOUT(out0, 5,b1[0x1A] + b1[0x16]);
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b1[0x1E] += b1[0x19];
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SETOUT(out0, 3,b1[0x16] + b1[0x1E]);
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SETOUT(out0, 1,b1[0x1E] + b1[0x11]);
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b1[0x19] += b1[0x1D];
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SETOUT(out1, 1,b1[0x11] + b1[0x19]);
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SETOUT(out1, 3,b1[0x19] + b1[0x15]);
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b1[0x1D] += b1[0x1B];
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SETOUT(out1, 5,b1[0x15] + b1[0x1D]);
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SETOUT(out1, 7,b1[0x1D] + b1[0x13]);
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b1[0x1B] += b1[0x1F];
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SETOUT(out1, 9,b1[0x13] + b1[0x1B]);
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SETOUT(out1,11,b1[0x1B] + b1[0x17]);
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SETOUT(out1,13,b1[0x17] + b1[0x1F]);
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SETOUT(out1,15,b1[0x1F]);
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}
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/*
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* main DCT function
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*/
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void dct64_486(int *a,int *b,real *samples)
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{
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int bufs[33]; /* 32 + 1 extra for 8B store from x87 */
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dct64_1_486_a(samples,bufs);
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dct64_1_486_b(a,b,bufs);
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}
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