Function AudioEncode

AudioEncode/aencode.cpp:990–1080

}

int32_t AudioEncode(ReadSampleFunction *read, void *data, unsigned channels, unsigned sample_rate, float volume,
                    FILE *out, int levels, int samples_per_subband, float comp_ratio) {
  Encoder enc;
  memset(&enc, 0, sizeof(enc));

  if (!ReadSample_init(enc, read, data)) {
    DestroyEncoder(enc);
    return 0;
  }

  if (!bits_init(enc.m_bits, out)) {
    DestroyEncoder(enc);
    return 0;
  }

  enc.m_volume = volume;
  if (!SetupEncoder(enc, 0xF, std_lo_filter, std_hi_filter, levels, samples_per_subband)) {
    DestroyEncoder(enc);
    return 0;
  }

  enc.m_threshold = (int32_t)(float(enc.m_samplesPerBlock) * comp_ratio * 16.0f);

  int32_t originalPosVAR64 = ftell(out);

  // Header
  enc.m_bits.WriteBits(0x97, 8);
  enc.m_bits.WriteBits(0x28, 8);
  enc.m_bits.WriteBits(0x03, 8);

  // Version
  enc.m_bits.WriteBits(1, 8);

  // Sample Count (Placeholder 32bits for now)
  enc.m_bits.WriteBits(0, 8);
  enc.m_bits.WriteBits(0, 8);
  enc.m_bits.WriteBits(0, 8);
  enc.m_bits.WriteBits(0, 8);

  // Number of channels
  enc.m_bits.WriteBits(channels, 16);

  // Sample Rate
  enc.m_bits.WriteBits(sample_rate, 16);

  // Levels
  enc.m_bits.WriteBits(levels, 4);

  // Samples per Sub-band (rows)
  enc.m_bits.WriteBits(samples_per_subband, 12);

  enc.m_bandWriteEnabled = 0;

  int32_t esi = enc.m_adjustedSamplesTimeNumColumns;
  while (esi) {
    EncodeSample(enc);
    --esi;
  }