// Set the Framerate, and video size
private void SetConfigParms(DirectShowLib.ICaptureGraphBuilder2 capGraph, DirectShowLib.IBaseFilter capFilter, int iFrameRate, int iWidth, int iHeight)
{
int hr;
object o;
DirectShowLib.AMMediaType media;
// Find the stream config interface
hr = capGraph.FindInterface(
DirectShowLib.PinCategory.Capture, DirectShowLib.MediaType.Video, capFilter, typeof(DirectShowLib.IAMStreamConfig).GUID, out o);
DirectShowLib.IAMStreamConfig videoStreamConfig = o as DirectShowLib.IAMStreamConfig;
if (videoStreamConfig == null)
{
throw new Exception("Failed to get IAMStreamConfig");
}
// Get the existing format block
hr = videoStreamConfig.GetFormat(out media);
DsError.ThrowExceptionForHR(hr);
// copy out the videoinfoheader
DirectShowLib.VideoInfoHeader v = new DirectShowLib.VideoInfoHeader();
Marshal.PtrToStructure(media.formatPtr, v);
// if overriding the framerate, set the frame rate
if (iFrameRate > 0)
{
v.AvgTimePerFrame = 10000000 / iFrameRate;
}
// if overriding the width, set the width
if (iWidth > 0)
{
v.BmiHeader.Width = iWidth;
}
// if overriding the Height, set the Height
if (iHeight > 0)
{
v.BmiHeader.Height = iHeight;
}
// Copy the media structure back
Marshal.StructureToPtr(v, media.formatPtr, false);
// Set the new format
hr = videoStreamConfig.SetFormat(media);
DsError.ThrowExceptionForHR(hr);
DirectShowLib.DsUtils.FreeAMMediaType(media);
media = null;
}
/// <summary> build the capture graph for grabber. </summary>
private void SetupGraph(DsDevice dev, int iFrameRate, int iWidth, int iHeight, Control hControl)
{
int hr;
DirectShowLib.ISampleGrabber sampGrabber = null;
DirectShowLib.IBaseFilter capFilter = null;
DirectShowLib.ICaptureGraphBuilder2 capGraph = null;
// Get the graphbuilder object
m_graphBuilder = (DirectShowLib.IFilterGraph2) new FilterGraph();
m_mediaCtrl = m_graphBuilder as DirectShowLib.IMediaControl;
try
{
// Get the ICaptureGraphBuilder2
capGraph = (DirectShowLib.ICaptureGraphBuilder2) new DirectShowLib.CaptureGraphBuilder2();
// Get the SampleGrabber interface
sampGrabber = (DirectShowLib.ISampleGrabber) new DirectShowLib.SampleGrabber();
// Start building the graph
hr = capGraph.SetFiltergraph(m_graphBuilder);
DsError.ThrowExceptionForHR(hr);
// Add the video device
hr = m_graphBuilder.AddSourceFilterForMoniker(dev.Mon, null, "Video input", out capFilter);
DsError.ThrowExceptionForHR(hr);
DirectShowLib.IBaseFilter baseGrabFlt = (DirectShowLib.IBaseFilter)sampGrabber;
ConfigureSampleGrabber(sampGrabber);
// Add the frame grabber to the graph
hr = m_graphBuilder.AddFilter(baseGrabFlt, "Ds.NET Grabber");
DsError.ThrowExceptionForHR(hr);
// If any of the default config items are set
if (iFrameRate + iHeight + iWidth > 0)
{
SetConfigParms(capGraph, capFilter, iFrameRate, iWidth, iHeight);
}
// ------------------------------------
if (false)
{
if (false)
{
hr = capGraph.RenderStream(DirectShowLib.PinCategory.Preview, DirectShowLib.MediaType.Video, capFilter, null, baseGrabFlt);
DsError.ThrowExceptionForHR(hr);
}
theCompressor = CreateFilter(FilterCategory.VideoCompressorCategory, "Microsoft MPEG-4 Video Codec V2");
// Add the Video compressor filter to the graph
if (theCompressor != null)
{
hr = m_graphBuilder.AddFilter(theCompressor, "Compressor Filter");
DsError.ThrowExceptionForHR(hr);
}
// Create the file writer part of the graph. SetOutputFileName does this for us, and returns the mux and sink
DirectShowLib.IBaseFilter mux;
DirectShowLib.IFileSinkFilter sink;
hr = capGraph.SetOutputFileName(DirectShowLib.MediaSubType.Avi, "C:\\Test.avi", out mux, out sink);
DsError.ThrowExceptionForHR(hr);
hr = capGraph.RenderStream(DirectShowLib.PinCategory.Capture, DirectShowLib.MediaType.Video, capFilter, theCompressor, mux);
DsError.ThrowExceptionForHR(hr);
Marshal.ReleaseComObject(mux);
Marshal.ReleaseComObject(sink);
hr = capGraph.RenderStream(DirectShowLib.PinCategory.Preview, DirectShowLib.MediaType.Video, capFilter, null, null);
DsError.ThrowExceptionForHR(hr);
//ShowVideoWindow(hControl);
}
else
{
hr = capGraph.RenderStream(DirectShowLib.PinCategory.Capture, DirectShowLib.MediaType.Video, capFilter, null, baseGrabFlt);
DsError.ThrowExceptionForHR(hr);
//hr = capGraph.RenderStream(DirectShowLib.PinCategory.Preview, DirectShowLib.MediaType.Video, capFilter, null, null);
//DsError.ThrowExceptionForHR(hr);
//ShowVideoWindow(hControl);
}
// --------------------------------------
//hr = capGraph.RenderStream( DirectShowLib.PinCategory.Capture, DirectShowLib.MediaType.Video, capFilter, null, baseGrabFlt );
//DsError.ThrowExceptionForHR( hr );
SaveSizeInfo(sampGrabber);
}
finally
{
if (capFilter != null)
{
Marshal.ReleaseComObject(capFilter);
capFilter = null;
}
if (sampGrabber != null)
{
Marshal.ReleaseComObject(sampGrabber);
sampGrabber = null;
}
if (capGraph != null)
{
Marshal.ReleaseComObject(capGraph);
capGraph = null;
}
}
}