static void ConfigureAudioInput(DSGraph graph, Transcoder transcoder)
{
AMMediaType mt = new AMMediaType();
int hr;
try
{
hr = graph.audioGrabber.GetConnectedMediaType(mt);
DsError.ThrowExceptionForHR(hr);
if ((mt.majorType != DirectShowLib.MediaType.Audio) ||
(mt.formatType != DirectShowLib.FormatType.WaveEx))
{
throw new COMException("Unexpected format type");
}
WaveFormatEx wfx = (WaveFormatEx)Marshal.PtrToStructure(mt.formatPtr, typeof(WaveFormatEx));
AudioStreamInfo audioInfo = new AudioStreamInfo();
audioInfo.BitsPerSample = wfx.wBitsPerSample;
audioInfo.Channels = wfx.nChannels;
audioInfo.SampleRate = wfx.nSamplesPerSec;
audioInfo.StreamType = StreamType.LPCM;
MediaSocket inputSocket = new MediaSocket();
MediaPin inputPin = new MediaPin();
inputPin.StreamInfo = audioInfo;
inputSocket.Pins.Add(inputPin);
inputSocket.StreamType = StreamType.LPCM;
graph.audioGrabberCB.Init(transcoder, transcoder.Inputs.Count, graph.mediaControl);
transcoder.Inputs.Add(inputSocket);
}
finally
{
DsUtils.FreeAMMediaType(mt);
}
}
static void EncodeDirectShowInput(string inputFile, string outputFile, string preset)
{
if (File.Exists(outputFile))
{
File.Delete(outputFile);
}
DSGraph dsGraph = new DSGraph();
Transcoder transcoder = new Transcoder();
// In order to use the OEM release for testing (without a valid license) the transcoder demo mode must be enabled.
transcoder.AllowDemoMode = true;
try
{
Console.WriteLine("Initializing DirectShow graph.");
/*
* If the source is a DirectShow filter instead of a file then:
* 1) Create an instance of the source filter
* 2) Configure source filter
* 3) Call dsGraph.Init(sourceFilter);
*
* For example dsGraph.Init(inputFile) can be replaced with the following code:
*
* 1) Create an instance of the source filter
*
* // FileSourceAsync filter
* IBaseFilter sourceFilter = Util.CreateFilter(new Guid("e436ebb5-524f-11ce-9f53-0020af0ba770"));
*
* // or WM ASF Reader filter
* IBaseFilter sourceFilter = Util.CreateFilter(new Guid("187463A0-5BB7-11D3-ACBE-0080C75E246E"));
*
* 2) Configure source filter
* IFileSourceFilter fileSourceFilter = sourceFilter as IFileSourceFilter;
* fileSourceFilter.Load(inputFile, null);
*
* 3)
* dsGraph.Init(sourceFilter);
*/
dsGraph.Init(inputFile);
if (dsGraph.videoGrabber != null)
{
ConfigureVideoInput(dsGraph, transcoder);
}
if (dsGraph.audioGrabber != null)
{
ConfigureAudioInput(dsGraph, transcoder);
}
if ((dsGraph.videoGrabber == null) && (dsGraph.audioGrabber == null))
{
Console.WriteLine("No audio or video can be read from the DirectShow graph.");
return;
}
// Configure output
{
MediaSocket outSocket = MediaSocket.FromPreset(preset);
outSocket.File = outputFile;
transcoder.Outputs.Add(outSocket);
}
bool res = transcoder.Open();
PrintError("Open Transcoder", transcoder.Error);
if (!res)
{
return;
}
//DBG
//var rot = new DsROTEntry(dsGraph.graph);
Console.WriteLine("Running DirectShow graph.");
int hr = dsGraph.mediaControl.Run();
DsError.ThrowExceptionForHR(hr);
while (true)
{
FilterState fs;
dsGraph.mediaControl.GetState(-1, out fs);
if (fs != FilterState.Running)
{
break;
}
EventCode ev;
dsGraph.mediaEvent.WaitForCompletion(1000, out ev);
if (EventCode.Complete == ev)
{
break;
}
}
Console.WriteLine("DirectShow graph is stopped.");
if ((dsGraph.videoGrabberCB != null) && (dsGraph.videoGrabberCB.TranscoderError != null))
{
PrintError("Transcoder Error", transcoder.Error);
}
if ((dsGraph.audioGrabberCB != null) && (dsGraph.audioGrabberCB.TranscoderError != null))
{
PrintError("Transcoder Error", transcoder.Error);
}
Console.WriteLine("Closing transcoder.");
if (!transcoder.Flush())
{
PrintError("Flush Transcoder", transcoder.Error);
}
transcoder.Close();
}
finally
{
dsGraph.Reset();
transcoder.Dispose();
}
}
static void ConfigureVideoInput(DSGraph graph, Transcoder transcoder)
{
AMMediaType mt = new AMMediaType();
int hr;
try
{
hr = graph.videoGrabber.GetConnectedMediaType(mt);
DsError.ThrowExceptionForHR(hr);
if ((mt.majorType != DirectShowLib.MediaType.Video) ||
(mt.formatType != DirectShowLib.FormatType.VideoInfo))
{
throw new COMException("Unexpected format type");
}
VideoInfoHeader vih = (VideoInfoHeader)Marshal.PtrToStructure(mt.formatPtr, typeof(VideoInfoHeader));
VideoStreamInfo videoInfo = new VideoStreamInfo();
if (vih.AvgTimePerFrame > 0)
{
videoInfo.FrameRate = (double)10000000 / vih.AvgTimePerFrame;
}
videoInfo.Bitrate = 0;
videoInfo.FrameHeight = Math.Abs(vih.BmiHeader.Height);
videoInfo.FrameWidth = vih.BmiHeader.Width;
videoInfo.DisplayRatioWidth = videoInfo.FrameWidth;
videoInfo.DisplayRatioHeight = videoInfo.FrameHeight;
videoInfo.ColorFormat = Util.GetColorFormat(ref mt.subType);
videoInfo.Duration = 0;
videoInfo.StreamType = StreamType.UncompressedVideo;
videoInfo.ScanType = ScanType.Progressive;
switch (videoInfo.ColorFormat)
{
case ColorFormat.BGR32:
case ColorFormat.BGRA32:
case ColorFormat.BGR24:
case ColorFormat.BGR444:
case ColorFormat.BGR555:
case ColorFormat.BGR565:
videoInfo.FrameBottomUp = (vih.BmiHeader.Height > 0);
break;
}
MediaSocket inputSocket = new MediaSocket();
MediaPin inputPin = new MediaPin();
inputPin.StreamInfo = videoInfo;
inputSocket.Pins.Add(inputPin);
inputSocket.StreamType = StreamType.UncompressedVideo;
graph.videoGrabberCB.Init(transcoder, transcoder.Inputs.Count, graph.mediaControl);
transcoder.Inputs.Add(inputSocket);
}
finally
{
DsUtils.FreeAMMediaType(mt);
}
}
