public FilterInOut(string name, FilterContext filterContext)
{
if (string.IsNullOrEmpty(name))
{
throw new ArgumentException("Required", nameof(name));
}
FilterContext = filterContext;
Pointer = ffmpeg.avfilter_inout_alloc();
if (Pointer == null)
{
throw new Exception("FilterInOut was not allocated");
}
Pointer->name = ffmpeg.av_strdup(name);
Pointer->filter_ctx = filterContext.Pointer;
Pointer->pad_idx = 0;
Pointer->next = null;
}
public static FilterGraph Create(
Codec decoder,
Codec encoder,
string filterSpecification)
{
if (decoder is null)
{
throw new ArgumentNullException(nameof(decoder));
}
if (encoder is null)
{
throw new ArgumentNullException(nameof(encoder));
}
FilterContext bufferSource = default;
FilterContext bufferSink = default;
var graph = new FilterGraph();
if (decoder is VideoDecoder)
{
var format = new VideoFormatInfo(
decoder.Context.PixelFormat,
decoder.Context.Width,
decoder.Context.Height,
decoder.Context.TimeBase,
decoder.Context.AspectRatio
);
bufferSource = graph.AddSource(format);
bufferSink = graph.AddSink(Filter.FromName("buffersink"));
bufferSink.SetOption("pix_fmts", (int)encoder.Context.PixelFormat.ToAVFormat());
}
else if (decoder is AudioDecoder audioDecoder)
{
if (audioDecoder.Context.ChannelLayout == ChannelLayout.Unknown)
{
throw new Exception("Invalid ChannelLayout:" + audioDecoder.Context.ChannelLayout);
// decoder.Context.ChannelLayout = (ChannelLayout)ffmpeg.av_get_default_channel_layout(decoder.Context.ChannelCount);
}
bufferSource = graph.AddSource(new AudioFormatInfo(
sampleFormat: audioDecoder.Context.SampleFormat,
sampleRate: audioDecoder.Context.SampleRate,
channelCount: audioDecoder.Context.ChannelCount,
channelLayout: audioDecoder.Context.ChannelLayout
));
bufferSink = graph.AddSink(Filter.FromName("abuffersink"));
// $"aresample={resampledAudioFormat.SampleRate},aformat=sample_fmts={sampleFormat}:channel_layouts=stereo,asetnsamples=n=1024:p=0"
// var sampleFormatName = ffmpeg.av_get_sample_fmt_name(encoder.Context.SampleFormat.ToAVFormat());
bufferSink.SetOption("sample_fmts", (int)encoder.Context.SampleFormat.ToAVFormat());
bufferSink.SetOption("channel_layouts", (ulong)encoder.Context.ChannelLayout);
bufferSink.SetOption("sample_rates", encoder.Context.SampleRate);
}
else
{
throw new Exception("Invalid codec");
}
graph.Outputs = new FilterInOut("in", bufferSource);
graph.Inputs = new FilterInOut("out", bufferSink);
graph.bufferSource = bufferSource;
graph.bufferSink = bufferSink;
if (filterSpecification != null)
{
graph.Parse(filterSpecification);
}
else
{
ffmpeg.avfilter_link(bufferSource.Pointer, 0, bufferSink.Pointer, 0);
}
graph.Initialize();
return(graph);
}
