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* Mpeg Layer-1,2,3 audio decoder
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* ------------------------------
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* copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved.
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#define WRITE_SAMPLE(samples,sum,clip) \
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if( (sum) > REAL_PLUS_32767) { *(samples) = 0x7fff; (clip)++; } \
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else if( (sum) < REAL_MINUS_32768) { *(samples) = -0x8000; (clip)++; } \
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else { *(samples) = REAL_TO_SHORT(sum); }
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int synth_1to1_8bit(real *bandPtr,int channel,unsigned char *samples,int *pnt)
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short samples_tmp[64];
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short *tmp1 = samples_tmp + channel;
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ret = synth_1to1(bandPtr,channel,(unsigned char *) samples_tmp,&pnt1);
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samples += channel + *pnt;
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*samples = conv16to8[*tmp1>>AUSHIFT];
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int synth_1to1_8bit_mono(real *bandPtr,unsigned char *samples,int *pnt)
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short samples_tmp[64];
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short *tmp1 = samples_tmp;
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ret = synth_1to1(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
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*samples++ = conv16to8[*tmp1>>AUSHIFT];
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int synth_1to1_8bit_mono2stereo(real *bandPtr,unsigned char *samples,int *pnt)
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short samples_tmp[64];
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short *tmp1 = samples_tmp;
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ret = synth_1to1(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
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*samples++ = conv16to8[*tmp1>>AUSHIFT];
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*samples++ = conv16to8[*tmp1>>AUSHIFT];
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int synth_1to1_mono(real *bandPtr,unsigned char *samples,int *pnt)
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short samples_tmp[64];
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short *tmp1 = samples_tmp;
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ret = synth_1to1(bandPtr,0,(unsigned char *) samples_tmp,&pnt1);
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*( (short *)samples) = *tmp1;
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int synth_1to1_mono2stereo(real *bandPtr,unsigned char *samples,int *pnt)
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ret = synth_1to1(bandPtr,0,samples,pnt);
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samples = samples + *pnt - 128;
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((short *)samples)[1] = ((short *)samples)[0];
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int synth_1to1(real *bandPtr,int channel,unsigned char *out,int *pnt)
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static real buffs[2][2][0x110];
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static const int step = 2;
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short *samples = (short *) (out+*pnt);
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real *b0,(*buf)[0x110];
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if(param.enable_equalizer)
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do_equalizer(bandPtr,channel);
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dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr);
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dct64(buf[0]+bo,buf[1]+bo+1,bandPtr);
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real *window = decwin + 16 - bo1;
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for (j=16;j;j--,window+=0x10,samples+=step)
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sum = REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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sum += REAL_MUL(*window++, *b0++);
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sum -= REAL_MUL(*window++, *b0++);
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WRITE_SAMPLE(samples,sum,clip);
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sum = REAL_MUL(window[0x0], b0[0x0]);
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sum += REAL_MUL(window[0x2], b0[0x2]);
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sum += REAL_MUL(window[0x4], b0[0x4]);
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sum += REAL_MUL(window[0x6], b0[0x6]);
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sum += REAL_MUL(window[0x8], b0[0x8]);
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sum += REAL_MUL(window[0xA], b0[0xA]);
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sum += REAL_MUL(window[0xC], b0[0xC]);
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sum += REAL_MUL(window[0xE], b0[0xE]);
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WRITE_SAMPLE(samples,sum,clip);
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b0-=0x10,window-=0x20,samples+=step;
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for (j=15;j;j--,b0-=0x20,window-=0x10,samples+=step)
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sum = -REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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sum -= REAL_MUL(*(--window), *b0++);
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WRITE_SAMPLE(samples,sum,clip);