/*
 * Mpeg Layer-1,2,3 audio decoder
 * ------------------------------
 * copyright (c) 1995,1996,1997 by Michael Hipp, All rights reserved.
 * See also 'README'
 *
 * slighlty optimized for machines without autoincrement/decrement.
 * The performance is highly compiler dependend. Maybe
 * the decode.c version for 'normal' processor may be faster
 * even for Intel processors.
 */

/* $Id: decode_i386.c,v 1.3 2003/08/12 00:02:55 snelg Exp $ */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#ifdef STDC_HEADERS
# include <stdlib.h>
# include <string.h>
#endif

#if defined(__riscos__) && defined(FPA10)
#include	"ymath.h"
#else
#include	<math.h>
#endif

#include "decode_i386.h"
#include "dct64_i386.h"
#include "tabinit.h"

#include "interface.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

Float_t *lSamp;
Float_t *rSamp;
Float_t *maxSamp;
unsigned char maxAmpOnly;

int procSamp;

int synth_1to1_mono(PMPSTR mp, real *bandPtr,int *pnt)
{
  int ret;
  int pnt1 = 0;

  ret = synth_1to1(mp,bandPtr,0,&pnt1);
  *pnt += 64;

  return ret;
}

int synth_1to1(PMPSTR mp, real *bandPtr,int channel,int *pnt)
{
/*  static const int step = 2; */
  int bo;
  Float_t *dsamp;
  real mSamp = 0;

  real *b0,(*buf)[0x110];
  int clip = 0;
  int bo1;

  bo = mp->synth_bo;

  if(!channel) {
    dsamp = lSamp;
    bo--;
    bo &= 0xf;
    buf = mp->synth_buffs[0];
  }
  else {
	dsamp = rSamp;
    buf = mp->synth_buffs[1];
  }

  if(bo & 0x1) {
    b0 = buf[0];
    bo1 = bo;
    dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr);
  }
  else {
    b0 = buf[1];
    bo1 = bo+1;
    dct64(buf[0]+bo,buf[1]+bo+1,bandPtr);
  }

  mp->synth_bo = bo;
if (maxAmpOnly) {
  {
    register int j;
    real *window = decwin + 16 - bo1;

    for (j=16;j;j--,b0+=0x10,window+=0x20)
    {
      real sum;
      sum  = window[0x0] * b0[0x0];
      sum -= window[0x1] * b0[0x1];
      sum += window[0x2] * b0[0x2];
      sum -= window[0x3] * b0[0x3];
      sum += window[0x4] * b0[0x4];
      sum -= window[0x5] * b0[0x5];
      sum += window[0x6] * b0[0x6];
      sum -= window[0x7] * b0[0x7];
      sum += window[0x8] * b0[0x8];
      sum -= window[0x9] * b0[0x9];
      sum += window[0xA] * b0[0xA];
      sum -= window[0xB] * b0[0xB];
      sum += window[0xC] * b0[0xC];
      sum -= window[0xD] * b0[0xD];
      sum += window[0xE] * b0[0xE];
      sum -= window[0xF] * b0[0xF];

	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
    }

    {
      real sum;
      sum  = window[0x0] * b0[0x0];
      sum += window[0x2] * b0[0x2];
      sum += window[0x4] * b0[0x4];
      sum += window[0x6] * b0[0x6];
      sum += window[0x8] * b0[0x8];
      sum += window[0xA] * b0[0xA];
      sum += window[0xC] * b0[0xC];
      sum += window[0xE] * b0[0xE];

	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
      b0-=0x10,window-=0x20;
    }
    window += bo1<<1;

    for (j=15;j;j--,b0-=0x10,window-=0x20)
    {
      real sum;
      sum = -window[-0x1] * b0[0x0];
      sum -= window[-0x2] * b0[0x1];
      sum -= window[-0x3] * b0[0x2];
      sum -= window[-0x4] * b0[0x3];
      sum -= window[-0x5] * b0[0x4];
      sum -= window[-0x6] * b0[0x5];
      sum -= window[-0x7] * b0[0x6];
      sum -= window[-0x8] * b0[0x7];
      sum -= window[-0x9] * b0[0x8];
      sum -= window[-0xA] * b0[0x9];
      sum -= window[-0xB] * b0[0xA];
      sum -= window[-0xC] * b0[0xB];
      sum -= window[-0xD] * b0[0xC];
      sum -= window[-0xE] * b0[0xD];
      sum -= window[-0xF] * b0[0xE];
      sum -= window[-0x0] * b0[0xF];

	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
    }
  }
}
else {


  {
    register int j;
    real *window = decwin + 16 - bo1;

    for (j=16;j;j--,b0+=0x10,window+=0x20)
    {
      real sum;
      sum  = window[0x0] * b0[0x0];
      sum -= window[0x1] * b0[0x1];
      sum += window[0x2] * b0[0x2];
      sum -= window[0x3] * b0[0x3];
      sum += window[0x4] * b0[0x4];
      sum -= window[0x5] * b0[0x5];
      sum += window[0x6] * b0[0x6];
      sum -= window[0x7] * b0[0x7];
      sum += window[0x8] * b0[0x8];
      sum -= window[0x9] * b0[0x9];
      sum += window[0xA] * b0[0xA];
      sum -= window[0xB] * b0[0xB];
      sum += window[0xC] * b0[0xC];
      sum -= window[0xD] * b0[0xD];
      sum += window[0xE] * b0[0xE];
      sum -= window[0xF] * b0[0xF];

	  *dsamp++ = (Float_t)sum;
	  procSamp++;
	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
    }

    {
      real sum;
      sum  = window[0x0] * b0[0x0];
      sum += window[0x2] * b0[0x2];
      sum += window[0x4] * b0[0x4];
      sum += window[0x6] * b0[0x6];
      sum += window[0x8] * b0[0x8];
      sum += window[0xA] * b0[0xA];
      sum += window[0xC] * b0[0xC];
      sum += window[0xE] * b0[0xE];
	  *dsamp++ = (Float_t)sum;
	  procSamp++;
	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
      b0-=0x10,window-=0x20;
    }
    window += bo1<<1;

    for (j=15;j;j--,b0-=0x10,window-=0x20)
    {
      real sum;
      sum = -window[-0x1] * b0[0x0];
      sum -= window[-0x2] * b0[0x1];
      sum -= window[-0x3] * b0[0x2];
      sum -= window[-0x4] * b0[0x3];
      sum -= window[-0x5] * b0[0x4];
      sum -= window[-0x6] * b0[0x5];
      sum -= window[-0x7] * b0[0x6];
      sum -= window[-0x8] * b0[0x7];
      sum -= window[-0x9] * b0[0x8];
      sum -= window[-0xA] * b0[0x9];
      sum -= window[-0xB] * b0[0xA];
      sum -= window[-0xC] * b0[0xB];
      sum -= window[-0xD] * b0[0xC];
      sum -= window[-0xE] * b0[0xD];
      sum -= window[-0xF] * b0[0xE];
      sum -= window[-0x0] * b0[0xF];

	  *dsamp++ = (Float_t)sum;
	  procSamp++;
	  if (sum > mSamp) {
		  mSamp = sum;
	  }
	  else if ((-sum) > mSamp) {
		  mSamp = (-sum);
	  }
    }
  }
}
  *pnt += 128;

  if ((Float_t)mSamp > *maxSamp)
	  *maxSamp = mSamp;

  if (!channel) lSamp = dsamp;
  else rSamp = dsamp;

  return clip;
}

