/// <exception cref="AudioExtractionException">The input file is not an FLV file.</exception>
public async Task <Stream> ExtractStreams()
{
return(await Task.Run(() =>
{
Seek(0);
if (ReadUInt32() != 0x464C5601)
{
// not a FLV file
throw new AudioExtractionException("Invalid input file. Impossible to extract audio track.");
}
ReadUInt8();
uint dataOffset = ReadUInt32();
Seek(dataOffset);
ReadUInt32();
while (_fileOffset < _fileLength)
{
if (!ReadTag())
{
break;
}
if (_fileLength - _fileOffset < 4)
{
break;
}
ReadUInt32();
double progress = (_fileOffset * 1.0 / _fileLength) * 100;
ConversionProgressChanged?.Invoke(this, new ProgressChangedEventArgs((int)progress, Guid.NewGuid()));
}
return _audioExtractor.Save();
}));
}
public void OnProgessChanged(int percent)
{
ConversionProgressChanged?.Invoke(this, percent);
}