Method audioDescDecoder

src/quicktimevideo.cpp:1195–1232

}  // QuickTimeVideo::sampleDesc

void QuickTimeVideo::audioDescDecoder() {
  DataBuf buf(40);
  std::memset(buf.data(), 0x0, buf.size());
  buf.data()[4] = '\0';
  io_->readOrThrow(buf.data(), 4);
  size_t size = 82;

  const TagVocabulary* td;

  for (int i = 0; size / 4 != 0; size -= 4, i++) {
    io_->readOrThrow(buf.data(), 4);
    switch (i) {
      case AudioFormat:
        td = Exiv2::find(qTimeFileType, Exiv2::toString(buf.data()));
        if (td)
          xmpData_["Xmp.audio.Compressor"] = exvGettext(td->label_);
        else
          xmpData_["Xmp.audio.Compressor"] = Exiv2::toString(buf.data());
        break;
      case AudioVendorID:
        td = Exiv2::find(vendorIDTags, Exiv2::toString(buf.data()));
        if (td)
          xmpData_["Xmp.audio.VendorID"] = exvGettext(td->label_);
        break;
      case AudioChannels:
        xmpData_["Xmp.audio.ChannelType"] = buf.read_uint16(0, bigEndian);
        xmpData_["Xmp.audio.BitsPerSample"] = (buf.data()[2] * 256 + buf.data()[3]);
        break;
      case AudioSampleRate:
        xmpData_["Xmp.audio.SampleRate"] =
            buf.read_uint16(0, bigEndian) + ((buf.data()[2] * 256 + buf.data()[3]) * 0.01);
        break;
      default:
        break;
    }
  }
  io_->readOrThrow(buf.data(), static_cast<long>(size % 4));  // cause size is so small, this cast should be right.
}  // QuickTimeVideo::audioDescDecoder

void QuickTimeVideo::imageDescDecoder() {
  DataBuf buf(40);