protected AudioFilter(MediaStream sourceStream, IEnumerator <AVFrameRef> source)
: base(null)
{
_sourceStream = sourceStream;
_source = source;
if (sourceStream.MediaType != AVMediaType.AVMEDIA_TYPE_AUDIO)
{
throw new ArgumentException("Source must be audio");
}
Current = new AVFrameRef {
Value = ffmpeg.av_frame_alloc()
};
}
public bool MoveNext()
{
ffmpeg.av_frame_unref(_frame);
ffmpeg.av_frame_unref(_receivedFrame);
int error;
do
{
try
{
do
{
ffmpeg.av_packet_unref(_packet);
error = ffmpeg.av_read_frame(_formatContext, _packet);
if (error == ffmpeg.AVERROR_EOF)
{
break;
}
error.ThrowExceptionIfError();
}while (_packet->stream_index != _streamIndex);
error = ffmpeg.avcodec_send_packet(_codecContext, error == ffmpeg.AVERROR_EOF ? null : _packet);
if (error != ffmpeg.AVERROR_EOF)
{
error.ThrowExceptionIfError();
}
}
finally
{
ffmpeg.av_packet_unref(_packet);
}
error = ffmpeg.avcodec_receive_frame(_codecContext, _frame);
}while (error == ffmpeg.AVERROR(ffmpeg.EAGAIN));
if (error == ffmpeg.AVERROR_EOF)
{
Current = default;
return(false);
}
error.ThrowExceptionIfError();
if (_codecContext->hw_device_ctx != null)
{
ffmpeg.av_hwframe_transfer_data(_receivedFrame, _frame, 0).ThrowExceptionIfError();
Current = new AVFrameRef {
Value = _receivedFrame
};
}
else
{
Current = new AVFrameRef {
Value = _frame
};
}
return(true);
}
