C++ (Cpp) schro_utils_multiplier_to_quant_indexの例

コード例 #1

void
schro_encoder_choose_quantisers_simple (SchroEncoderFrame *frame)
{
  SchroParams *params = &frame->params;
  int i;
  int component;
  double noise_amplitude;
  double a;
  double max;
  double *table;

  noise_amplitude = 255.0 * pow(0.1, frame->encoder->noise_threshold*0.05);
  SCHRO_DEBUG("noise %g", noise_amplitude);

  table = frame->encoder->subband_weights[params->wavelet_filter_index]
    [params->transform_depth-1];

  for(component=0;component<3;component++){
    for(i=0;i<1 + 3*params->transform_depth; i++) {
      a = noise_amplitude *
        frame->encoder->subband_weights[params->wavelet_filter_index]
          [params->transform_depth-1][i];

      frame->quant_index[component][i] = schro_utils_multiplier_to_quant_index (a);
    }
  }

#if 0
  max = table[0];
  for(i=0;i<1 + 3*params->transform_depth; i++) {
    if (table[i] > max) max = table[i];
  }
#else
  max = 1.0;
#endif

  for(i=0;i<1 + 3*params->transform_depth; i++) {
    params->quant_matrix[i] = schro_utils_multiplier_to_quant_index (max/table[i]);
    SCHRO_DEBUG("%g %g %d", table[i], max/table[i], params->quant_matrix[i]);
  }
}

コード例 #2

ファイル: utils.c プロジェクト: Distrotech/dirac

int
main (int argc, char *argv[])
{
  int i;
  double x;
  int j,k;

  schro_init();

  for(i=0;i<100;i++){
    x = i*1;
    j = schro_utils_multiplier_to_quant_index (x);
    k = schro_table_quant[j];
    printf("%g %d %d\n", x, j, k);
  }

  exit(0);
}