func: static void decode_block(BinkAudioContext *s, short *out, int use_dct)
  
  {
  
      int ch, i, j, k;
  
      float q, quant[25];
  
      int width, coeff;
  
      GetBitContext *gb = &s->gb;
  
  
  
      if (use_dct)
  
          skip_bits(gb, 2);
  
  
  
      for (ch = 0; ch < s->channels; ch++) {
  
          FFTSample *coeffs = s->coeffs_ptr[ch];
  
          if (s->version_b) {
  
              coeffs[0] = av_int2flt(get_bits(gb, 32)) * s->root;
  
              coeffs[1] = av_int2flt(get_bits(gb, 32)) * s->root;
  
          } else {
  
              coeffs[0] = get_float(gb) * s->root;
  
              coeffs[1] = get_float(gb) * s->root;
  
          }
  
  
  
          for (i = 0; i < s->num_bands; i++) {
  
              /* constant is result of 0.066399999/log10(M_E) */
  
              int value = get_bits(gb, 8);
  
              quant[i] = expf(FFMIN(value, 95) * 0.15289164787221953823f) * s->root;
  
          }
  
  
  
          k = 0;
  
          q = quant[0];
  
  
  
          // parse coefficients
  
          i = 2;
  
          while (i < s->frame_len) {
  
              if (s->version_b) {
  
                  j = i + 16;
  
              } else if (get_bits1(gb)) {
  
                  j = i + rle_length_tab[get_bits(gb, 4)] * 8;
  
              } else {
  
                  j = i + 8;
  
              }
  
  
  
              j = FFMIN(j, s->frame_len);
  
  
  
              width = get_bits(gb, 4);
  
              if (width == 0) {
  
                  memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
  
                  i = j;
  
                  while (s->bands[k] < i)
  
                      q = quant[k++];
  
              } else {
  
                  while (i < j) {
  
                      if (s->bands[k] == i)
  
                          q = quant[k++];
  
                      coeff = get_bits(gb, width);
  
                      if (coeff) {
  
                          if (get_bits1(gb))
  
                              coeffs[i] = -q * coeff;
  
                          else
  
                              coeffs[i] =  q * coeff;
  
                      } else {
  
                          coeffs[i] = 0.0f;
  
                      }
  
                      i++;
  
                  }
  
              }
  
          }
  
  
  
          if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
  
              coeffs[0] /= 0.5;
  
              s->trans.dct.dct_calc(&s->trans.dct,  coeffs);
  
              s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
  
          }
  
          else if (CONFIG_BINKAUDIO_RDFT_DECODER)
  
              s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
  
      }
  
  
  
      s->fmt_conv.float_to_int16_interleave(out, (const float **)s->coeffs_ptr,
  
                                            s->frame_len, s->channels);
  
  
  
      if (!s->first) {
  
          int count = s->overlap_len * s->channels;
  
          int shift = av_log2(count);
  
          for (i = 0; i < count; i++) {
  
              out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
  
          }
  
      }
  
  
  
      memcpy(s->previous, out + s->block_size,
  
             s->overlap_len * s->channels * sizeof(*out));
  
  
  
      s->first = 0;
  
  }
  