how to mix aforge and DirectShow

See more:

C#

C#3.5

video

directshow

So I never typically have struggled in C# until I came across video. It seems one trial after another.

Capturing using a crossbar 8820 device
camera produces PAL video
worse yet video is interlaced
need to grab a frame at a time from the video.


So in Aforge, I can get everything I need, get it all up and running, except interlacing. I have the DeInterlace.ax registered and it can work in directshow, but I get stuck on how to mix the two worlds.

 VideoCaptureDeviceForm form = new VideoCaptureDeviceForm( );

            if ( form.ShowDialog( this ) == DialogResult.OK )
            {
                // create video source
                VideoCaptureDevice videoSource = form.VideoDevice;

                // open it
                OpenVideoSource( videoSource );
            }
private void videoSourcePlayer_NewFrame(object sender, ref Bitmap img)
        {

This is over simplified ofcourse. Now say I want to add a deinterlace filter in ? it seems I can't do it in the Aforge.Video world ? Seems to force me to directshow ? Where I have to fight crossbar, and a host of fun things

<pre lang="c#">        
void buildUSB2820()
{
   InitilizeDirectShow();
   IBaseFilter usb2820 = DirectShowLib.Utils.FilterGraphTools.AddFilterByName(graphBuilder, FilterCategory.VideoInputDevice, "USB 2820 Device");
   IBaseFilter crossbar = DirectShowLib.Utils.FilterGraphTools.AddFilterByName(graphBuilder, FilterCategory.AMKSCrossbar, "WDM 2820 Crossbar");
  bool success = DirectShowLib.Utils.FilterGraphTools.RenderPin(graphBuilder, crossbar, "0: Video Decoder Out");
  FinishGraph(ref usb2820, "Capture");
 }

private void InitilizeDirectShow()
{
   cleanupCom();
   int hr = 0;
   graphBuilder = (IGraphBuilder)(new FilterGraph());
   captureGraphBuilder = (ICaptureGraphBuilder2)(new CaptureGraphBuilder2());
   hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
   DsError.ThrowExceptionForHR(hr);
   mediaControl = (IMediaControl)graphBuilder;
   videoWindow = (IVideoWindow)graphBuilder;
   mediaEventEx = (IMediaEventEx)graphBuilder;
   // send notification messages to the control window  
   //hr = mediaEventEx.SetNotifyWindow(this.Handle, 0x00008001, IntPtr.Zero);  
   //DsError.ThrowExceptionForHR(hr);  
}

void FinishGraph(ref IBaseFilter filterName, string pinName)
{
  IBaseFilter pAVIDecompressor = null;
  if (deInterlace.Checked)
  {
    IBaseFilter lace = addIbaseFilter(CLSID_delace, "lace");
    connectPins(filterName, pinName, lace, "Input");
    pAVIDecompressor = addIbaseFilter("AVIDecoder", (IBaseFilter)new AVIDec());
    connectPins(lace, "Output", pAVIDecompressor, "XForm In");
  }
  else
  {
    pAVIDecompressor = addIbaseFilter("AVIDecoder", (IBaseFilter)new AVIDec());
    connectPins(filterName, pinName, pAVIDecompressor, "XForm In");
  }

  //IBaseFilter render = addIbaseFilter(CLSID_VideoRenderer, "Renderer");
           // connectPins(color, "XForm Out", render, "VMR Input0");

 IBaseFilter render = addIbaseFilter(CLSID_VideoRenderer, "Renderer");
 connectPins(pAVIDecompressor, "XForm Out", render, "VMR Input0");
            
 // try and add to panel video
 connectRenderToForm(render);
            
 mediaControl.Run();
}

So it seems I get stuck in one world or another. In Aforge, I have no way to add the interlace filter in that I know of. In directShow, I can easily add the deinterlace, but I have a hard time grabbing a frame. I got close adding sampleGrabber in, but got an incompatible pins error trying to connect SampleGrabber to the renderer.

In a simple world I would then connect the directshow to the Aforge VideoSourcePlayer object and I would be super happy. Any ideas ?