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ampsynth.cpp
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ampsynth.cpp
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// amp11 - an Audio-MPEG decoder - synthesizer
// Copyright (c) 1997-99 Niklas Beisert
// See COPYING (GNU Library General Public License 2) for license
// some ideas regarding optimization of the subband synthesis
// were taken from mpg123 by Michael Hipp
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "ampdec.h"
#define _PI 3.14159265358979323846
#define BUFFEROFFSET (16*17)
float ampegdecoder::dwin[1024];
float ampegdecoder::dwin2[512];
float ampegdecoder::dwin4[256];
float ampegdecoder::sectab[32];
#ifdef __WATCOMC__
#define MULADDINLINE
float __muladd16a(float *a, float *b);
#pragma aux __muladd16a parm [ebx] [ecx] value [8087] modify exact [8087] = \
"fld dword ptr [ebx+ 0]" \
"fmul dword ptr [ecx+ 0]" \
"fld dword ptr [ebx+ 4]" \
"fmul dword ptr [ecx+ 4]" \
"fxch st(1)" \
"fld dword ptr [ebx+ 8]" \
"fmul dword ptr [ecx+ 8]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+12]" \
"fmul dword ptr [ecx+12]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+16]" \
"fmul dword ptr [ecx+16]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+20]" \
"fmul dword ptr [ecx+20]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+24]" \
"fmul dword ptr [ecx+24]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+28]" \
"fmul dword ptr [ecx+28]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+32]" \
"fmul dword ptr [ecx+32]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+36]" \
"fmul dword ptr [ecx+36]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+40]" \
"fmul dword ptr [ecx+40]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+44]" \
"fmul dword ptr [ecx+44]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+48]" \
"fmul dword ptr [ecx+48]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+52]" \
"fmul dword ptr [ecx+52]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+56]" \
"fmul dword ptr [ecx+56]" \
"fxch st(2)" \
"fsubp st(1),st" \
"fld dword ptr [ebx+60]" \
"fmul dword ptr [ecx+60]" \
"fxch st(2)" \
"faddp st(1),st" \
"fsubrp st(1),st"
float __muladd16b(float *a, float *b);
#pragma aux __muladd16b parm [ebx] [ecx] value [8087] modify exact [8087] = \
"fld dword ptr [ebx+60]" \
"fmul dword ptr [ecx+ 0]" \
"fld dword ptr [ebx+56]" \
"fmul dword ptr [ecx+ 4]" \
"fxch st(1)" \
"fld dword ptr [ebx+52]" \
"fmul dword ptr [ecx+ 8]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+48]" \
"fmul dword ptr [ecx+12]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+44]" \
"fmul dword ptr [ecx+16]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+40]" \
"fmul dword ptr [ecx+20]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+36]" \
"fmul dword ptr [ecx+24]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+32]" \
"fmul dword ptr [ecx+28]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+28]" \
"fmul dword ptr [ecx+32]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+24]" \
"fmul dword ptr [ecx+36]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+20]" \
"fmul dword ptr [ecx+40]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+16]" \
"fmul dword ptr [ecx+44]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+12]" \
"fmul dword ptr [ecx+48]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+ 8]" \
"fmul dword ptr [ecx+52]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+ 4]" \
"fmul dword ptr [ecx+56]" \
"fxch st(2)" \
"faddp st(1),st" \
"fld dword ptr [ebx+ 0]" \
"fmul dword ptr [ecx+60]" \
"fxch st(2)" \
"faddp st(1),st" \
"faddp st(1),st" \
"fchs"
#endif
#ifdef GNUCI486
#define MULADDINLINE
static inline float __muladd16a(float *a, float *b)
{
float res;
asm
(
"flds 0(%1)\n"
"fmuls 0(%2)\n"
"flds 4(%1)\n"
"fmuls 4(%2)\n"
"fxch %%st(1)\n"
"flds 8(%1)\n"
"fmuls 8(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 12(%1)\n"
"fmuls 12(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 16(%1)\n"
"fmuls 16(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 20(%1)\n"
"fmuls 20(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 24(%1)\n"
"fmuls 24(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 28(%1)\n"
"fmuls 28(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 32(%1)\n"
"fmuls 32(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 36(%1)\n"
"fmuls 36(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 40(%1)\n"
"fmuls 40(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 44(%1)\n"
"fmuls 44(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 48(%1)\n"
"fmuls 48(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 52(%1)\n"
"fmuls 52(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 56(%1)\n"
"fmuls 56(%2)\n"
"fxch %%st(2)\n"
"fsubrp %%st,%%st(1)\n"
"flds 60(%1)\n"
"fmuls 60(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"fsubp %%st,%%st(1)"
: "=st"(res) : "r"(a),"r"(b) : "st(7)","st(6)","st(5)"
);
return res;
}
static inline float __muladd16b(float *a, float *b)
{
float res;
asm
(
"flds 60(%1)\n"
"fmuls 0(%2)\n"
"flds 56(%1)\n"
"fmuls 4(%2)\n"
"fxch %%st(1)\n"
"flds 52(%1)\n"
"fmuls 8(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 48(%1)\n"
"fmuls 12(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 44(%1)\n"
"fmuls 16(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 40(%1)\n"
"fmuls 20(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 36(%1)\n"
"fmuls 24(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 32(%1)\n"
"fmuls 28(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 28(%1)\n"
"fmuls 32(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 24(%1)\n"
"fmuls 36(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 20(%1)\n"
"fmuls 40(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 16(%1)\n"
"fmuls 44(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 12(%1)\n"
"fmuls 48(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 8(%1)\n"
"fmuls 52(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 4(%1)\n"
"fmuls 56(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"flds 0(%1)\n"
"fmuls 60(%2)\n"
"fxch %%st(2)\n"
"faddp %%st,%%st(1)\n"
"faddp %%st,%%st(1)\n"
"fchs"
: "=st"(res) : "r"(a),"r"(b) : "st(7)","st(6)","st(5)"
);
return res;
}
#endif
float ampegdecoder::muladd16a(float *a, float *b)
{
#ifdef MULADDINLINE
return __muladd16a(a,b);
#else
return +a[ 0]*b[ 0]-a[ 1]*b[ 1]+a[ 2]*b[ 2]-a[ 3]*b[ 3]
+a[ 4]*b[ 4]-a[ 5]*b[ 5]+a[ 6]*b[ 6]-a[ 7]*b[ 7]
+a[ 8]*b[ 8]-a[ 9]*b[ 9]+a[10]*b[10]-a[11]*b[11]
+a[12]*b[12]-a[13]*b[13]+a[14]*b[14]-a[15]*b[15];
#endif
}
float ampegdecoder::muladd16b(float *a, float *b)
{
#ifdef MULADDINLINE
return __muladd16b(a,b);
#else
return -a[15]*b[ 0]-a[14]*b[ 1]-a[13]*b[ 2]-a[12]*b[ 3]
-a[11]*b[ 4]-a[10]*b[ 5]-a[ 9]*b[ 6]-a[ 8]*b[ 7]
-a[ 7]*b[ 8]-a[ 6]*b[ 9]-a[ 5]*b[10]-a[ 4]*b[11]
-a[ 3]*b[12]-a[ 2]*b[13]-a[ 1]*b[14]-a[ 0]*b[15];
#endif
}
#ifndef FDCTBEXT
void ampegdecoder::fdctb8(float *out1, float *out2, float *in)
{
float p1[8];
float p2[8];
p1[ 0] = in[ 0] + in[ 7];
p1[ 7] = sectab[ 4] * (in[ 0] - in[ 7]);
p1[ 1] = in[ 1] + in[ 6];
p1[ 6] = sectab[ 5] * (in[ 1] - in[ 6]);
p1[ 2] = in[ 2] + in[ 5];
p1[ 5] = sectab[ 6] * (in[ 2] - in[ 5]);
p1[ 3] = in[ 3] + in[ 4];
p1[ 4] = sectab[ 7] * (in[ 3] - in[ 4]);
p2[ 0] = p1[ 0] + p1[ 3];
p2[ 3] = sectab[ 2] * (p1[ 0] - p1[ 3]);
p2[ 1] = p1[ 1] + p1[ 2];
p2[ 2] = sectab[ 3] * (p1[ 1] - p1[ 2]);
p2[ 4] = p1[ 4] + p1[ 7];
p2[ 7] =-sectab[ 2] * (p1[ 4] - p1[ 7]);
p2[ 5] = p1[ 5] + p1[ 6];
p2[ 6] =-sectab[ 3] * (p1[ 5] - p1[ 6]);
p1[ 0] = p2[ 0] + p2[ 1];
p1[ 1] = sectab[ 1] * (p2[ 0] - p2[ 1]);
p1[ 2] = p2[ 2] + p2[ 3];
p1[ 3] =-sectab[ 1] * (p2[ 2] - p2[ 3]);
p1[ 2] += p1[ 3];
p1[ 4] = p2[ 4] + p2[ 5];
p1[ 5] = sectab[ 1] * (p2[ 4] - p2[ 5]);
p1[ 6] = p2[ 6] + p2[ 7];
p1[ 7] =-sectab[ 1] * (p2[ 6] - p2[ 7]);
p1[ 6] += p1[ 7];
p1[ 4] += p1[ 6];
p1[ 6] += p1[ 5];
p1[ 5] += p1[ 7];
out1[16* 0]=p1[ 1];
out1[16* 1]=p1[ 6];
out1[16* 2]=p1[ 2];
out1[16* 3]=p1[ 4];
out1[16* 4]=p1[ 0];
out2[16* 0]=p1[ 1];
out2[16* 1]=p1[ 5];
out2[16* 2]=p1[ 3];
out2[16* 3]=p1[ 7];
}
void ampegdecoder::fdctb16(float *out1, float *out2, float *in)
{
float p1[16];
float p2[16];
p2[ 0] = in[ 0] + in[15];
p2[15] = sectab[ 8] * (in[ 0] - in[15]);
p2[ 1] = in[ 1] + in[14];
p2[14] = sectab[ 9] * (in[ 1] - in[14]);
p2[ 2] = in[ 2] + in[13];
p2[13] = sectab[10] * (in[ 2] - in[13]);
p2[ 3] = in[ 3] + in[12];
p2[12] = sectab[11] * (in[ 3] - in[12]);
p2[ 4] = in[ 4] + in[11];
p2[11] = sectab[12] * (in[ 4] - in[11]);
p2[ 5] = in[ 5] + in[10];
p2[10] = sectab[13] * (in[ 5] - in[10]);
p2[ 6] = in[ 6] + in[ 9];
p2[ 9] = sectab[14] * (in[ 6] - in[ 9]);
p2[ 7] = in[ 7] + in[ 8];
p2[ 8] = sectab[15] * (in[ 7] - in[ 8]);
p1[ 0] = p2[ 0] + p2[ 7];
p1[ 7] = sectab[ 4] * (p2[ 0] - p2[ 7]);
p1[ 1] = p2[ 1] + p2[ 6];
p1[ 6] = sectab[ 5] * (p2[ 1] - p2[ 6]);
p1[ 2] = p2[ 2] + p2[ 5];
p1[ 5] = sectab[ 6] * (p2[ 2] - p2[ 5]);
p1[ 3] = p2[ 3] + p2[ 4];
p1[ 4] = sectab[ 7] * (p2[ 3] - p2[ 4]);
p1[ 8] = p2[ 8] + p2[15];
p1[15] =-sectab[ 4] * (p2[ 8] - p2[15]);
p1[ 9] = p2[ 9] + p2[14];
p1[14] =-sectab[ 5] * (p2[ 9] - p2[14]);
p1[10] = p2[10] + p2[13];
p1[13] =-sectab[ 6] * (p2[10] - p2[13]);
p1[11] = p2[11] + p2[12];
p1[12] =-sectab[ 7] * (p2[11] - p2[12]);
p2[ 0] = p1[ 0] + p1[ 3];
p2[ 3] = sectab[ 2] * (p1[ 0] - p1[ 3]);
p2[ 1] = p1[ 1] + p1[ 2];
p2[ 2] = sectab[ 3] * (p1[ 1] - p1[ 2]);
p2[ 4] = p1[ 4] + p1[ 7];
p2[ 7] =-sectab[ 2] * (p1[ 4] - p1[ 7]);
p2[ 5] = p1[ 5] + p1[ 6];
p2[ 6] =-sectab[ 3] * (p1[ 5] - p1[ 6]);
p2[ 8] = p1[ 8] + p1[11];
p2[11] = sectab[ 2] * (p1[ 8] - p1[11]);
p2[ 9] = p1[ 9] + p1[10];
p2[10] = sectab[ 3] * (p1[ 9] - p1[10]);
p2[12] = p1[12] + p1[15];
p2[15] =-sectab[ 2] * (p1[12] - p1[15]);
p2[13] = p1[13] + p1[14];
p2[14] =-sectab[ 3] * (p1[13] - p1[14]);
p1[ 0] = p2[ 0] + p2[ 1];
p1[ 1] = sectab[ 1] * (p2[ 0] - p2[ 1]);
p1[ 2] = p2[ 2] + p2[ 3];
p1[ 3] =-sectab[ 1] * (p2[ 2] - p2[ 3]);
p1[ 2] += p1[ 3];
p1[ 4] = p2[ 4] + p2[ 5];
p1[ 5] = sectab[ 1] * (p2[ 4] - p2[ 5]);
p1[ 6] = p2[ 6] + p2[ 7];
p1[ 7] =-sectab[ 1] * (p2[ 6] - p2[ 7]);
p1[ 6] += p1[ 7];
p1[ 4] += p1[ 6];
p1[ 6] += p1[ 5];
p1[ 5] += p1[ 7];
p1[ 8] = p2[ 8] + p2[ 9];
p1[ 9] = sectab[ 1] * (p2[ 8] - p2[ 9]);
p1[10] = p2[10] + p2[11];
p1[11] =-sectab[ 1] * (p2[10] - p2[11]);
p1[10] += p1[11];
p1[12] = p2[12] + p2[13];
p1[13] = sectab[ 1] * (p2[12] - p2[13]);
p1[14] = p2[14] + p2[15];
p1[15] =-sectab[ 1] * (p2[14] - p2[15]);
p1[14] += p1[15];
p1[12] += p1[14];
p1[14] += p1[13];
p1[13] += p1[15];
out1[16* 0]=p1[ 1];
out1[16* 1]=p1[14]+p1[ 9];
out1[16* 2]=p1[ 6];
out1[16* 3]=p1[10]+p1[14];
out1[16* 4]=p1[ 2];
out1[16* 5]=p1[12]+p1[10];
out1[16* 6]=p1[ 4];
out1[16* 7]=p1[ 8]+p1[12];
out1[16* 8]=p1[ 0];
out2[16* 0]=p1[ 1];
out2[16* 1]=p1[ 9]+p1[13];
out2[16* 2]=p1[ 5];
out2[16* 3]=p1[13]+p1[11];
out2[16* 4]=p1[ 3];
out2[16* 5]=p1[11]+p1[15];
out2[16* 6]=p1[ 7];
out2[16* 7]=p1[15];
}
void ampegdecoder::fdctb32(float *out1, float *out2, float *in)
{
float p1[32];
float p2[32];
p1[ 0] = in[0] + in[31];
p1[31] = sectab[16] * (in[0] - in[31]);
p1[ 1] = in[1] + in[30];
p1[30] = sectab[17] * (in[1] - in[30]);
p1[ 2] = in[2] + in[29];
p1[29] = sectab[18] * (in[2] - in[29]);
p1[ 3] = in[3] + in[28];
p1[28] = sectab[19] * (in[3] - in[28]);
p1[ 4] = in[4] + in[27];
p1[27] = sectab[20] * (in[4] - in[27]);
p1[ 5] = in[5] + in[26];
p1[26] = sectab[21] * (in[5] - in[26]);
p1[ 6] = in[6] + in[25];
p1[25] = sectab[22] * (in[6] - in[25]);
p1[ 7] = in[7] + in[24];
p1[24] = sectab[23] * (in[7] - in[24]);
p1[ 8] = in[8] + in[23];
p1[23] = sectab[24] * (in[8] - in[23]);
p1[ 9] = in[9] + in[22];
p1[22] = sectab[25] * (in[9] - in[22]);
p1[10] = in[10] + in[21];
p1[21] = sectab[26] * (in[10] - in[21]);
p1[11] = in[11] + in[20];
p1[20] = sectab[27] * (in[11] - in[20]);
p1[12] = in[12] + in[19];
p1[19] = sectab[28] * (in[12] - in[19]);
p1[13] = in[13] + in[18];
p1[18] = sectab[29] * (in[13] - in[18]);
p1[14] = in[14] + in[17];
p1[17] = sectab[30] * (in[14] - in[17]);
p1[15] = in[15] + in[16];
p1[16] = sectab[31] * (in[15] - in[16]);
p2[ 0] = p1[ 0] + p1[15];
p2[15] = sectab[ 8] * (p1[ 0] - p1[15]);
p2[ 1] = p1[ 1] + p1[14];
p2[14] = sectab[ 9] * (p1[ 1] - p1[14]);
p2[ 2] = p1[ 2] + p1[13];
p2[13] = sectab[10] * (p1[ 2] - p1[13]);
p2[ 3] = p1[ 3] + p1[12];
p2[12] = sectab[11] * (p1[ 3] - p1[12]);
p2[ 4] = p1[ 4] + p1[11];
p2[11] = sectab[12] * (p1[ 4] - p1[11]);
p2[ 5] = p1[ 5] + p1[10];
p2[10] = sectab[13] * (p1[ 5] - p1[10]);
p2[ 6] = p1[ 6] + p1[ 9];
p2[ 9] = sectab[14] * (p1[ 6] - p1[ 9]);
p2[ 7] = p1[ 7] + p1[ 8];
p2[ 8] = sectab[15] * (p1[ 7] - p1[ 8]);
p2[16] = p1[16] + p1[31];
p2[31] =-sectab[ 8] * (p1[16] - p1[31]);
p2[17] = p1[17] + p1[30];
p2[30] =-sectab[ 9] * (p1[17] - p1[30]);
p2[18] = p1[18] + p1[29];
p2[29] =-sectab[10] * (p1[18] - p1[29]);
p2[19] = p1[19] + p1[28];
p2[28] =-sectab[11] * (p1[19] - p1[28]);
p2[20] = p1[20] + p1[27];
p2[27] =-sectab[12] * (p1[20] - p1[27]);
p2[21] = p1[21] + p1[26];
p2[26] =-sectab[13] * (p1[21] - p1[26]);
p2[22] = p1[22] + p1[25];
p2[25] =-sectab[14] * (p1[22] - p1[25]);
p2[23] = p1[23] + p1[24];
p2[24] =-sectab[15] * (p1[23] - p1[24]);
p1[ 0] = p2[ 0] + p2[ 7];
p1[ 7] = sectab[ 4] * (p2[ 0] - p2[ 7]);
p1[ 1] = p2[ 1] + p2[ 6];
p1[ 6] = sectab[ 5] * (p2[ 1] - p2[ 6]);
p1[ 2] = p2[ 2] + p2[ 5];
p1[ 5] = sectab[ 6] * (p2[ 2] - p2[ 5]);
p1[ 3] = p2[ 3] + p2[ 4];
p1[ 4] = sectab[ 7] * (p2[ 3] - p2[ 4]);
p1[ 8] = p2[ 8] + p2[15];
p1[15] =-sectab[ 4] * (p2[ 8] - p2[15]);
p1[ 9] = p2[ 9] + p2[14];
p1[14] =-sectab[ 5] * (p2[ 9] - p2[14]);
p1[10] = p2[10] + p2[13];
p1[13] =-sectab[ 6] * (p2[10] - p2[13]);
p1[11] = p2[11] + p2[12];
p1[12] =-sectab[ 7] * (p2[11] - p2[12]);
p1[16] = p2[16] + p2[23];
p1[23] = sectab[ 4] * (p2[16] - p2[23]);
p1[17] = p2[17] + p2[22];
p1[22] = sectab[ 5] * (p2[17] - p2[22]);
p1[18] = p2[18] + p2[21];
p1[21] = sectab[ 6] * (p2[18] - p2[21]);
p1[19] = p2[19] + p2[20];
p1[20] = sectab[ 7] * (p2[19] - p2[20]);
p1[24] = p2[24] + p2[31];
p1[31] =-sectab[ 4] * (p2[24] - p2[31]);
p1[25] = p2[25] + p2[30];
p1[30] =-sectab[ 5] * (p2[25] - p2[30]);
p1[26] = p2[26] + p2[29];
p1[29] =-sectab[ 6] * (p2[26] - p2[29]);
p1[27] = p2[27] + p2[28];
p1[28] =-sectab[ 7] * (p2[27] - p2[28]);
p2[ 0] = p1[ 0] + p1[ 3];
p2[ 3] = sectab[ 2] * (p1[ 0] - p1[ 3]);
p2[ 1] = p1[ 1] + p1[ 2];
p2[ 2] = sectab[ 3] * (p1[ 1] - p1[ 2]);
p2[ 4] = p1[ 4] + p1[ 7];
p2[ 7] =-sectab[ 2] * (p1[ 4] - p1[ 7]);
p2[ 5] = p1[ 5] + p1[ 6];
p2[ 6] =-sectab[ 3] * (p1[ 5] - p1[ 6]);
p2[ 8] = p1[ 8] + p1[11];
p2[11] = sectab[ 2] * (p1[ 8] - p1[11]);
p2[ 9] = p1[ 9] + p1[10];
p2[10] = sectab[ 3] * (p1[ 9] - p1[10]);
p2[12] = p1[12] + p1[15];
p2[15] =-sectab[ 2] * (p1[12] - p1[15]);
p2[13] = p1[13] + p1[14];
p2[14] =-sectab[ 3] * (p1[13] - p1[14]);
p2[16] = p1[16] + p1[19];
p2[19] = sectab[ 2] * (p1[16] - p1[19]);
p2[17] = p1[17] + p1[18];
p2[18] = sectab[ 3] * (p1[17] - p1[18]);
p2[20] = p1[20] + p1[23];
p2[23] =-sectab[ 2] * (p1[20] - p1[23]);
p2[21] = p1[21] + p1[22];
p2[22] =-sectab[ 3] * (p1[21] - p1[22]);
p2[24] = p1[24] + p1[27];
p2[27] = sectab[ 2] * (p1[24] - p1[27]);
p2[25] = p1[25] + p1[26];
p2[26] = sectab[ 3] * (p1[25] - p1[26]);
p2[28] = p1[28] + p1[31];
p2[31] =-sectab[ 2] * (p1[28] - p1[31]);
p2[29] = p1[29] + p1[30];
p2[30] =-sectab[ 3] * (p1[29] - p1[30]);
p1[ 0] = p2[ 0] + p2[ 1];
p1[ 1] = sectab[ 1] * (p2[ 0] - p2[ 1]);
p1[ 2] = p2[ 2] + p2[ 3];
p1[ 3] =-sectab[ 1] * (p2[ 2] - p2[ 3]);
p1[ 2] += p1[ 3];
p1[ 4] = p2[ 4] + p2[ 5];
p1[ 5] = sectab[ 1] * (p2[ 4] - p2[ 5]);
p1[ 6] = p2[ 6] + p2[ 7];
p1[ 7] =-sectab[ 1] * (p2[ 6] - p2[ 7]);
p1[ 6] += p1[ 7];
p1[ 4] += p1[ 6];
p1[ 6] += p1[ 5];
p1[ 5] += p1[ 7];
p1[ 8] = p2[ 8] + p2[ 9];
p1[ 9] = sectab[ 1] * (p2[ 8] - p2[ 9]);
p1[10] = p2[10] + p2[11];
p1[11] =-sectab[ 1] * (p2[10] - p2[11]);
p1[10] += p1[11];
p1[12] = p2[12] + p2[13];
p1[13] = sectab[ 1] * (p2[12] - p2[13]);
p1[14] = p2[14] + p2[15];
p1[15] =-sectab[ 1] * (p2[14] - p2[15]);
p1[14] += p1[15];
p1[12] += p1[14];
p1[14] += p1[13];
p1[13] += p1[15];
p1[16] = p2[16] + p2[17];
p1[17] = sectab[ 1] * (p2[16] - p2[17]);
p1[18] = p2[18] + p2[19];
p1[19] =-sectab[ 1] * (p2[18] - p2[19]);
p1[18] += p1[19];
p1[20] = p2[20] + p2[21];
p1[21] = sectab[ 1] * (p2[20] - p2[21]);
p1[22] = p2[22] + p2[23];
p1[23] =-sectab[ 1] * (p2[22] - p2[23]);
p1[22] += p1[23];
p1[20] += p1[22];
p1[22] += p1[21];
p1[21] += p1[23];
p1[24] = p2[24] + p2[25];
p1[25] = sectab[ 1] * (p2[24] - p2[25]);
p1[26] = p2[26] + p2[27];
p1[27] =-sectab[ 1] * (p2[26] - p2[27]);
p1[26] += p1[27];
p1[28] = p2[28] + p2[29];
p1[29] = sectab[ 1] * (p2[28] - p2[29]);
p1[30] = p2[30] + p2[31];
p1[31] =-sectab[ 1] * (p2[30] - p2[31]);
p1[30] += p1[31];
p1[28] += p1[30];
p1[30] += p1[29];
p1[29] += p1[31];
out1[16* 0] = p1[ 1];
out1[16* 1] = p1[17] + p1[30] + p1[25];
out1[16* 2] = p1[14] + p1[ 9];
out1[16* 3] = p1[22] + p1[30] + p1[25];
out1[16* 4] = p1[ 6];
out1[16* 5] = p1[22] + p1[26] + p1[30];
out1[16* 6] = p1[10] + p1[14];
out1[16* 7] = p1[18] + p1[26] + p1[30];
out1[16* 8] = p1[ 2];
out1[16* 9] = p1[18] + p1[28] + p1[26];
out1[16*10] = p1[12] + p1[10];
out1[16*11] = p1[20] + p1[28] + p1[26];
out1[16*12] = p1[ 4];
out1[16*13] = p1[20] + p1[24] + p1[28];
out1[16*14] = p1[ 8] + p1[12];
out1[16*15] = p1[16] + p1[24] + p1[28];
out1[16*16] = p1[ 0];
out2[16* 0] = p1[ 1];
out2[16* 1] = p1[17] + p1[25] + p1[29];
out2[16* 2] = p1[ 9] + p1[13];
out2[16* 3] = p1[21] + p1[25] + p1[29];
out2[16* 4] = p1[ 5];
out2[16* 5] = p1[21] + p1[29] + p1[27];
out2[16* 6] = p1[13] + p1[11];
out2[16* 7] = p1[19] + p1[29] + p1[27];
out2[16* 8] = p1[ 3];
out2[16* 9] = p1[19] + p1[27] + p1[31];
out2[16*10] = p1[11] + p1[15];
out2[16*11] = p1[23] + p1[27] + p1[31];
out2[16*12] = p1[ 7];
out2[16*13] = p1[23] + p1[31];
out2[16*14] = p1[15];
out2[16*15] = p1[31];
}
#endif
void ampegdecoder::synth(void *dest, float (*bandsl)[32], float (*bandsr)[32])
{
int blk;
for (blk=0; blk<36; blk++)
{
int i,j,k;
int nsmp=32>>ratereduce;
int nsmp2=16>>ratereduce;
if (usevoltab)
{
if (tomono)
for (i=0; i<nsmp; i++)
bandsl[0][i]=bandsl[0][i]*stereotab[2][0]+bandsr[0][i]*stereotab[2][1];
else
if (srcchan==2)
for (i=0; i<nsmp; i++)
{
float t=bandsl[0][i];
bandsl[0][i]=bandsl[0][i]*stereotab[0][0]+bandsr[0][i]*stereotab[0][1];
bandsr[0][i]=t*stereotab[1][0]+bandsr[0][i]*stereotab[1][1];
}
else
for (i=0; i<nsmp; i++)
bandsl[0][i]*=stereotab[2][2];
}
else
if (tomono)
for (i=0; i<nsmp; i++)
bandsl[0][i]=0.5*(bandsl[0][i]+bandsr[0][i]);
if (volume!=1)
{
for (i=0; i<nsmp; i++)
bandsl[0][i]*=volume;
if (!tomono&&(srcchan!=1))
for (i=0; i<nsmp; i++)
bandsr[0][i]*=volume;
}
if (equalon)
{
for (i=0; i<nsmp; i++)
bandsl[0][i]*=equal[i];
if (!tomono&&(srcchan!=1))
for (i=0; i<nsmp; i++)
bandsr[0][i]*=equal[i];
}
for (k=0; k<dctstereo; k++)
{
float *out1=synbuf+k*2*BUFFEROFFSET+(synbufoffset&1)*BUFFEROFFSET+((synbufoffset+1)&14);
float *out2=synbuf+k*2*BUFFEROFFSET+((synbufoffset+1)&1)*BUFFEROFFSET+(synbufoffset|1);
if (ratereduce==0)
fdctb32(out1, out2, k?bandsr[0]:bandsl[0]);
else
if (ratereduce==1)
fdctb16(out1, out2, k?bandsr[0]:bandsl[0]);
else
fdctb8(out1, out2, k?bandsr[0]:bandsl[0]);
}
bandsl++;
bandsr++;
float *in=synbuf+((synbufoffset+1)&1)*BUFFEROFFSET;
float *dw1=((ratereduce==0)?dwin:(ratereduce==1)?dwin2:dwin4)+16-(synbufoffset|1);
float *dw2=dw1-16+2*(synbufoffset|1);
synbufoffset = (synbufoffset-1)&15;
if (!dest)
continue;
if (samplesize==2)
{
short *samples=(short*)dest;
if (!tostereo)
if (dstchan==2)
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[2*j+0]=cliptoshort(muladd16a(dw1,in));
samples[2*j+1]=cliptoshort(muladd16a(dw1,in+BUFFEROFFSET*2));
if (!j||(j==nsmp2))
continue;
samples[2*2*nsmp2-2*j+0]=cliptoshort(muladd16b(dw2,in));
samples[2*2*nsmp2-2*j+1]=cliptoshort(muladd16b(dw2,in+BUFFEROFFSET*2));
}
else
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[j]=cliptoshort(muladd16a(dw1,in));
if (!j||(j==nsmp2))
continue;
samples[2*nsmp2-j]=cliptoshort(muladd16b(dw2,in));
}
else
if (!usevoltab)
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[2*j+0]=samples[2*j+1]=cliptoshort(muladd16a(dw1,in));
if (!j||(j==nsmp2))
continue;
samples[2*2*nsmp2-2*j+0]=samples[2*2*nsmp2-2*j+1]=cliptoshort(muladd16b(dw2,in));
}
else
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
double sum=muladd16a(dw1,in);
samples[2*j+0]=cliptoshort(sum*stereotab[0][2]);
samples[2*j+1]=cliptoshort(sum*stereotab[1][2]);
if (!j||(j==nsmp2))
continue;
sum=muladd16b(dw2,in);
samples[2*2*nsmp2-2*j+0]=cliptoshort(sum*stereotab[0][2]);
samples[2*2*nsmp2-2*j+1]=cliptoshort(sum*stereotab[1][2]);
}
}
else
{
float *samples=(float*)dest;
if (!tostereo)
if (dstchan==2)
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[2*j+0]=muladd16a(dw1,in);
samples[2*j+1]=muladd16a(dw1,in+BUFFEROFFSET*2);
if (!j||(j==nsmp2))
continue;
samples[2*2*nsmp2-2*j+0]=muladd16b(dw2,in);
samples[2*2*nsmp2-2*j+1]=muladd16b(dw2,in+BUFFEROFFSET*2);
}
else
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[j]=muladd16a(dw1,in);
if (!j||(j==nsmp2))
continue;
samples[2*nsmp2-j]=muladd16b(dw2,in);
}
else
if (!usevoltab)
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
samples[2*j+0]=samples[2*j+1]=muladd16a(dw1,in);
if (!j||(j==nsmp2))
continue;
samples[2*2*nsmp2-2*j+0]=samples[2*2*nsmp2-2*j+1]=muladd16b(dw2,in);
}
else
for (j=0; j<=nsmp2; j++, dw1+=32, dw2+=32, in+=16)
{
double sum=muladd16a(dw1,in);
samples[2*j+0]=sum*stereotab[0][2];
samples[2*j+1]=sum*stereotab[1][2];
if (!j||(j==nsmp2))
continue;
sum=muladd16b(dw2,in);
samples[2*2*nsmp2-2*j+0]=sum*stereotab[0][2];
samples[2*2*nsmp2-2*j+1]=sum*stereotab[1][2];
}
}
dest=((char*)dest)+samplesize*dstchan*(32>>ratereduce);
}
}
void ampegdecoder::resetsynth()
{
int i;
synbufoffset=0;
for (i=0; i<(BUFFEROFFSET*4); i++)
synbuf[i]=0;
}
int ampegdecoder::opensynth()
{
int i,j;
resetsynth();
float dwincc[8];
// dwincc[5]=-0.342943448; // 2.739098988
// dwincc[6]=0.086573376; // 11.50752718
// dwincc[7]=-0.00773018993; // 129.3590624
dwincc[5]=-0.341712191984;
dwincc[6]=0.0866307578916;
dwincc[7]=-0.00849728985506;
dwincc[0]=0.5;
dwincc[1]=-sqrt(1-dwincc[7]*dwincc[7]);
dwincc[2]=sqrt(1-dwincc[6]*dwincc[6]);
dwincc[3]=-sqrt(1-dwincc[5]*dwincc[5]);
dwincc[4]=sqrt(0.5);
for (i=0; i<1024; i++)
{
double v=0;
for (j=0; j<8; j++)
v+=cos(2*_PI/512*((i<<5)+(i>>5))*j)*dwincc[j]*8192;
dwin[i]=(i&2)?-v:v;
}
for (i=0; i<512; i++)
dwin2[i]=dwin[(i&31)+((i&~31)<<1)];
for (i=0; i<256; i++)
dwin4[i]=dwin[(i&31)+((i&~31)<<2)];
for (j=0; j<5; j++)
for (i=0; i<(1<<j); i++)
sectab[i+(1<<j)]=0.5/cos(_PI*(2*i+1)/(4<<j));
if (!dstchan)
dstchan=srcchan;
tomono=0;
tostereo=0;
if (dstchan==-2)
{
dstchan=2;
tostereo=1;
if (srcchan==2)
tomono=1;
}
if ((srcchan==2)&&(dstchan==1))
tomono=1;
if ((srcchan==1)&&(dstchan==2))
tostereo=1;
dctstereo=(tomono||tostereo||(srcchan==1))?1:2;
usevoltab=0;
volume=1;
equalon=0;
return 1;
}
void ampegdecoder::setvol(float v)
{
volume=v;
}
void ampegdecoder::setstereo(const float *v)
{
if (!v)
{
usevoltab=0;
return;
}
if ((v[0]==1)&&(v[1]==0)&&(v[2]==1)&&(v[3]==0)&&(v[4]==1)&&(v[5]==1)&&(v[6]==0.5)&&(v[7]==0.5)&&(v[8]==1))
{
usevoltab=0;
return;
}
stereotab[0][0]=v[0];
stereotab[0][1]=v[1];
stereotab[0][2]=v[2];
stereotab[1][0]=v[3];
stereotab[1][1]=v[4];
stereotab[1][2]=v[5];
stereotab[2][0]=v[6];
stereotab[2][1]=v[7];
stereotab[2][2]=v[8];
usevoltab=1;
}
void ampegdecoder::setequal(const float *buf)
{
if (!buf)
{
equalon=0;
return;
}
int i;
for (i=0; i<32; i++)
if (buf[i]!=1)
break;
if (i==32)
{
equalon=0;
return;
}
if (ratereduce==0)
for (i=0; i<32; i++)
equal[i]=buf[i];
else
if (ratereduce==1)
for (i=0; i<16; i++)
equal[i]=(buf[2*i+0]+buf[2*i+1])/2;
else
for (i=0; i<8; i++)
equal[i]=(buf[4*i+0]+buf[4*i+1]+buf[4*i+2]+buf[4*i+3])/4;
equalon=1;
}