func: static int decode_block(BinkAudioContext *s, float **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 = out[ch];
  
  
  
          if (s->version_b) {
  
              if (get_bits_left(gb) < 64)
  
                  return AVERROR_INVALIDDATA;
  
              coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
  
              coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root;
  
          } else {
  
              if (get_bits_left(gb) < 58)
  
                  return AVERROR_INVALIDDATA;
  
              coeffs[0] = get_float(gb) * s->root;
  
              coeffs[1] = get_float(gb) * s->root;
  
          }
  
  
  
          if (get_bits_left(gb) < s->num_bands * 8)
  
              return AVERROR_INVALIDDATA;
  
          for (i = 0; i < s->num_bands; i++) {
  
              int value = get_bits(gb, 8);
  
              quant[i]  = quant_table[FFMIN(value, 95)];
  
          }
  
  
  
          k = 0;
  
          q = quant[0];
  
  
  
          // parse coefficients
  
          i = 2;
  
          while (i < s->frame_len) {
  
              if (s->version_b) {
  
                  j = i + 16;
  
              } else {
  
                  int v;
  
                  GET_BITS_SAFE(v, 1);
  
                  if (v) {
  
                      GET_BITS_SAFE(v, 4);
  
                      j = i + rle_length_tab[v] * 8;
  
                  } else {
  
                      j = i + 8;
  
                  }
  
              }
  
  
  
              j = FFMIN(j, s->frame_len);
  
  
  
              GET_BITS_SAFE(width, 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++];
  
                      GET_BITS_SAFE(coeff, width);
  
                      if (coeff) {
  
                          int v;
  
                          GET_BITS_SAFE(v, 1);
  
                          if (v)
  
                              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);
  
          }
  
          else if (CONFIG_BINKAUDIO_RDFT_DECODER)
  
              s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs);
  
      }
  
  
  
      for (ch = 0; ch < s->channels; ch++) {
  
          int j;
  
          int count = s->overlap_len * s->channels;
  
          if (!s->first) {
  
              j = ch;
  
              for (i = 0; i < s->overlap_len; i++, j += s->channels)
  
                  out[ch][i] = (s->previous[ch][i] * (count - j) +
  
                                        out[ch][i] *          j) / count;
  
          }
  
          memcpy(s->previous[ch], &out[ch][s->frame_len - s->overlap_len],
  
                 s->overlap_len * sizeof(*s->previous[ch]));
  
      }
  
  
  
      s->first = 0;
  
  
  
      return 0;
  
  }
  