#include "../libzmpeg3.h"

#define WRITE_SAMPLE(samples, sum) do { *(samples) = (sum); } while(0)

int zaudio_decoder_layer_t::
synth_stereo(float *bandPtr, int channel, float *out, int *pnt)
{
  float *samples = out + *pnt;
  float sum;
  float *b0, (*buf)[0x110];
  int j, bo1;

  if( !channel ) {
    --bo;
    bo &= 0xf;
    buf = synth_stereo_buffs[0];
  }
  else
    buf = synth_stereo_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);
  }

//zmsgs("%f %f %f\n", buf[0][0], buf[1][0], bandPtr[0]);

  float *window = decwin + 16 - bo1;
  for( j=16; j > 0; --j, b0+=0x10, window+=0x20, ++samples ) {
    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];
    WRITE_SAMPLE(samples, 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];
  WRITE_SAMPLE(samples, sum);
  b0 -= 0x10;
  window -= 0x20;
  ++samples;
  window += bo1 << 1;

  for( j=15; j > 0; --j, b0-=0x10, window-=0x20, ++samples ) {
    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];

    WRITE_SAMPLE(samples, sum);
  }
  *pnt += 32;

  return 0;
}



/* Call this after every seek to reset the buffers */
int zaudio_decoder_layer_t::
synths_reset()
{
  int i, j, k;
  for( i=0; i < 2; ++i ) {
    for( j=0; j < 2; ++j ) {
      for( k=0; k < 0x110; ++k ) {
        synth_stereo_buffs[i][j][k] = 0;
      }
    }
  }
  for( i=0; i < 64; ++i ) {
    synth_mono_buff[i] = 0;
    layer2_scfsi_buf[i] = 0;
  }
  for( i=0; i < 2; ++i ) {
    for( j=0; j < 2; ++j ) {
      for( k=0; k < (int)(SBLIMIT*SSLIMIT); ++k ) {
        mp3_block[i][j][k] = 0;
      }
    }
  }
  mp3_blc[0] = 0;
  mp3_blc[1] = 0;
  return 0;
}