Function WriteBand_Fmt17

AudioEncode/aencode.cpp:172–208

}

void WriteBand_Fmt17(Encoder &enc, int32_t colIndex, uint32_t formatId) {
  const float currBitValue = static_cast<float>(enc.m_currBlockBitValue);
  const float halfCurrBitValue = currBitValue * 0.5f;
  const int32_t minValue = (int32_t)ceilf(-32767.0f / currBitValue);
  const int32_t maxValue = (int32_t)floorf(32767.0f / currBitValue);

  const float *pCurrSample = &enc.m_levelSlots[enc.m_levels][colIndex];
  int32_t currSampleIndex = enc.m_samples_per_subband;
  while (currSampleIndex) {
    --currSampleIndex;
    int32_t val = (int32_t)floorf((*pCurrSample + halfCurrBitValue) / currBitValue);
    if (minValue > val) {
      val = minValue;
    } else if (maxValue < val) {
      val = maxValue;
    }

    pCurrSample += enc.m_numColumns;
    if (val == 0) {
      if (currSampleIndex != 0 && !(int)floorf((*pCurrSample + halfCurrBitValue) / currBitValue)) {
        enc.m_bits.WriteBits(0, 1);

        if (currSampleIndex == 0)
          return;
        --currSampleIndex;
        pCurrSample += enc.m_numColumns;
        continue;
      }

      enc.m_bits.WriteBits(1, 2);
      continue;
    }

    enc.m_bits.WriteBits(3, 2);
    enc.m_bits.WriteBits((val == 1) ? 1 : 0, 1);
  }
}

void WriteBand_Fmt18(Encoder &enc, int32_t colIndex, uint32_t formatId) {
  const float currBlockBitValue = static_cast<float>(enc.m_currBlockBitValue);