Method movieHeaderDecoder

src/quicktimevideo.cpp:1537–1601

}  // QuickTimeVideo::trackHeaderDecoder

void QuickTimeVideo::movieHeaderDecoder(size_t size) {
  DataBuf buf(5);
  std::memset(buf.data(), 0x0, buf.size());
  buf.data()[4] = '\0';

  for (int i = 0; size / 4 != 0; size -= 4, i++) {
    io_->readOrThrow(buf.data(), 4);

    switch (i) {
      case MovieHeaderVersion:
        xmpData_["Xmp.video.MovieHeaderVersion"] = static_cast<int>(buf.read_uint8(0));
        break;
      case CreateDate:
        // A 32-bit integer that specifies (in seconds since midnight, January 1, 1904) when the movie atom was created.
        xmpData_["Xmp.video.DateUTC"] = buf.read_uint32(0, bigEndian);
        break;
      case ModifyDate:
        // A 32-bit integer that specifies (in seconds since midnight, January 1, 1904) when the movie atom was created.
        xmpData_["Xmp.video.ModificationDate"] = buf.read_uint32(0, bigEndian);
        break;
      case TimeScale:
        xmpData_["Xmp.video.TimeScale"] = buf.read_uint32(0, bigEndian);
        mvhdTimeScale_ = buf.read_uint32(0, bigEndian);
        if (mvhdTimeScale_ <= 0)
          mvhdTimeScale_ = 1;
        break;
      case Duration:
        if (mvhdTimeScale_ != 0) {  // To prevent division by zero
          xmpData_["Xmp.video.Duration"] = buf.read_uint32(0, bigEndian) * 1000 / mvhdTimeScale_;
        }
        break;
      case PreferredRate:
        xmpData_["Xmp.video.PreferredRate"] =
            buf.read_uint16(0, bigEndian) + ((buf.data()[2] * 256 + buf.data()[3]) * 0.01);
        break;
      case PreferredVolume:
        xmpData_["Xmp.video.PreferredVolume"] = (static_cast<int>(buf.read_uint8(0)) + (buf.data()[2] * 0.1)) * 100;
        break;
      case PreviewTime:
        xmpData_["Xmp.video.PreviewTime"] = buf.read_uint32(0, bigEndian);
        break;
      case PreviewDuration:
        xmpData_["Xmp.video.PreviewDuration"] = buf.read_uint32(0, bigEndian);
        break;
      case PosterTime:
        xmpData_["Xmp.video.PosterTime"] = buf.read_uint32(0, bigEndian);
        break;
      case SelectionTime:
        xmpData_["Xmp.video.SelectionTime"] = buf.read_uint32(0, bigEndian);
        break;
      case SelectionDuration:
        xmpData_["Xmp.video.SelectionDuration"] = buf.read_uint32(0, bigEndian);
        break;
      case CurrentTime:
        xmpData_["Xmp.video.CurrentTime"] = buf.read_uint32(0, bigEndian);
        break;
      case NextTrackID:
        xmpData_["Xmp.video.NextTrackID"] = buf.read_uint32(0, bigEndian);