private void WorkerThread( bool runGraph ) { ReasonToFinishPlaying reasonToStop = ReasonToFinishPlaying.StoppedByUser; bool isSapshotSupported = false; // grabber Grabber videoGrabber = new Grabber( this, false ); Grabber snapshotGrabber = new Grabber( this, true ); // objects object captureGraphObject = null; object graphObject = null; object videoGrabberObject = null; object snapshotGrabberObject = null; object crossbarObject = null; // interfaces ICaptureGraphBuilder2 captureGraph = null; IFilterGraph2 graph = null; IBaseFilter sourceBase = null; IBaseFilter videoGrabberBase = null; IBaseFilter snapshotGrabberBase = null; ISampleGrabber videoSampleGrabber = null; ISampleGrabber snapshotSampleGrabber = null; IMediaControl mediaControl = null; IAMVideoControl videoControl = null; IMediaEventEx mediaEvent = null; IPin pinStillImage = null; IAMCrossbar crossbar = null; try { // get type of capture graph builder Type type = Type.GetTypeFromCLSID( Clsid.CaptureGraphBuilder2 ); if ( type == null ) throw new ApplicationException( "Failed creating capture graph builder" ); // create capture graph builder captureGraphObject = Activator.CreateInstance( type ); captureGraph = (ICaptureGraphBuilder2) captureGraphObject; // get type of filter graph type = Type.GetTypeFromCLSID( Clsid.FilterGraph ); if ( type == null ) throw new ApplicationException( "Failed creating filter graph" ); // create filter graph graphObject = Activator.CreateInstance( type ); graph = (IFilterGraph2) graphObject; // set filter graph to the capture graph builder captureGraph.SetFiltergraph( (IGraphBuilder) graph ); // create source device's object sourceObject = FilterInfo.CreateFilter( deviceMoniker ); if ( sourceObject == null ) throw new ApplicationException( "Failed creating device object for moniker" ); // get base filter interface of source device sourceBase = (IBaseFilter) sourceObject; // get video control interface of the device try { videoControl = (IAMVideoControl) sourceObject; } catch { // some camera drivers may not support IAMVideoControl interface } // get type of sample grabber type = Type.GetTypeFromCLSID( Clsid.SampleGrabber ); if ( type == null ) throw new ApplicationException( "Failed creating sample grabber" ); // create sample grabber used for video capture videoGrabberObject = Activator.CreateInstance( type ); videoSampleGrabber = (ISampleGrabber) videoGrabberObject; videoGrabberBase = (IBaseFilter) videoGrabberObject; // create sample grabber used for snapshot capture snapshotGrabberObject = Activator.CreateInstance( type ); snapshotSampleGrabber = (ISampleGrabber) snapshotGrabberObject; snapshotGrabberBase = (IBaseFilter) snapshotGrabberObject; // add source and grabber filters to graph graph.AddFilter( sourceBase, "source" ); graph.AddFilter( videoGrabberBase, "grabber_video" ); graph.AddFilter( snapshotGrabberBase, "grabber_snapshot" ); // set media type AMMediaType mediaType = new AMMediaType( ); mediaType.MajorType = MediaType.Video; mediaType.SubType = MediaSubType.RGB24; videoSampleGrabber.SetMediaType( mediaType ); snapshotSampleGrabber.SetMediaType( mediaType ); // get crossbar object to to allows configuring pins of capture card captureGraph.FindInterface( FindDirection.UpstreamOnly, Guid.Empty, sourceBase, typeof( IAMCrossbar ).GUID, out crossbarObject ); if ( crossbarObject != null ) { crossbar = (IAMCrossbar) crossbarObject; } isCrossbarAvailable = ( crossbar != null ); crossbarVideoInputs = ColletCrossbarVideoInputs( crossbar ); if ( videoControl != null ) { // find Still Image output pin of the vedio device captureGraph.FindPin( sourceObject, PinDirection.Output, PinCategory.StillImage, MediaType.Video, false, 0, out pinStillImage ); // check if it support trigger mode if ( pinStillImage != null ) { VideoControlFlags caps; videoControl.GetCaps( pinStillImage, out caps ); isSapshotSupported = ( ( caps & VideoControlFlags.ExternalTriggerEnable ) != 0 ); } } // configure video sample grabber videoSampleGrabber.SetBufferSamples( false ); videoSampleGrabber.SetOneShot( false ); videoSampleGrabber.SetCallback( videoGrabber, 1 ); // configure snapshot sample grabber snapshotSampleGrabber.SetBufferSamples( true ); snapshotSampleGrabber.SetOneShot( false ); snapshotSampleGrabber.SetCallback( snapshotGrabber, 1 ); // configure pins GetPinCapabilitiesAndConfigureSizeAndRate( captureGraph, sourceBase, PinCategory.Capture, desiredFrameSize, desiredFrameRate, ref videoCapabilities ); if ( isSapshotSupported ) { GetPinCapabilitiesAndConfigureSizeAndRate( captureGraph, sourceBase, PinCategory.StillImage, desiredSnapshotSize, 0, ref snapshotCapabilities ); } else { snapshotCapabilities = new VideoCapabilities[0]; } // put video/snapshot capabilities into cache lock ( cacheVideoCapabilities ) { if ( ( videoCapabilities != null ) && ( !cacheVideoCapabilities.ContainsKey( deviceMoniker ) ) ) { cacheVideoCapabilities.Add( deviceMoniker, videoCapabilities ); } } lock ( cacheSnapshotCapabilities ) { if ( ( snapshotCapabilities != null ) && ( !cacheSnapshotCapabilities.ContainsKey( deviceMoniker ) ) ) { cacheSnapshotCapabilities.Add( deviceMoniker, snapshotCapabilities ); } } if ( runGraph ) { // render capture pin captureGraph.RenderStream( PinCategory.Capture, MediaType.Video, sourceBase, null, videoGrabberBase ); if ( videoSampleGrabber.GetConnectedMediaType( mediaType ) == 0 ) { VideoInfoHeader vih = (VideoInfoHeader) Marshal.PtrToStructure( mediaType.FormatPtr, typeof( VideoInfoHeader ) ); videoGrabber.Width = vih.BmiHeader.Width; videoGrabber.Height = vih.BmiHeader.Height; mediaType.Dispose( ); } if ( ( isSapshotSupported ) && ( provideSnapshots ) ) { // render snapshot pin captureGraph.RenderStream( PinCategory.StillImage, MediaType.Video, sourceBase, null, snapshotGrabberBase ); if ( snapshotSampleGrabber.GetConnectedMediaType( mediaType ) == 0 ) { VideoInfoHeader vih = (VideoInfoHeader) Marshal.PtrToStructure( mediaType.FormatPtr, typeof( VideoInfoHeader ) ); snapshotGrabber.Width = vih.BmiHeader.Width; snapshotGrabber.Height = vih.BmiHeader.Height; mediaType.Dispose( ); } } // get media control mediaControl = (IMediaControl) graphObject; // get media events' interface mediaEvent = (IMediaEventEx) graphObject; IntPtr p1, p2; DsEvCode code; // run mediaControl.Run( ); if ( ( isSapshotSupported ) && ( provideSnapshots ) ) { startTime = DateTime.Now; videoControl.SetMode( pinStillImage, VideoControlFlags.ExternalTriggerEnable ); } do { if ( mediaEvent != null ) { if ( mediaEvent.GetEvent( out code, out p1, out p2, 0 ) >= 0 ) { mediaEvent.FreeEventParams( code, p1, p2 ); if ( code == DsEvCode.DeviceLost ) { reasonToStop = ReasonToFinishPlaying.DeviceLost; break; } } } if ( needToSetVideoInput ) { needToSetVideoInput = false; // set/check current input type of a video card (frame grabber) if ( isCrossbarAvailable.Value ) { SetCurrentCrossbarInput( crossbar, crossbarVideoInput ); crossbarVideoInput = GetCurrentCrossbarInput( crossbar ); } } if ( needToSimulateTrigger ) { needToSimulateTrigger = false; if ( ( isSapshotSupported ) && ( provideSnapshots ) ) { videoControl.SetMode( pinStillImage, VideoControlFlags.Trigger ); } } if ( needToDisplayPropertyPage ) { needToDisplayPropertyPage = false; DisplayPropertyPage( parentWindowForPropertyPage, sourceObject ); if ( crossbar != null ) { crossbarVideoInput = GetCurrentCrossbarInput( crossbar ); } } if ( needToDisplayCrossBarPropertyPage ) { needToDisplayCrossBarPropertyPage = false; if ( crossbar != null ) { DisplayPropertyPage( parentWindowForPropertyPage, crossbar ); crossbarVideoInput = GetCurrentCrossbarInput( crossbar ); } } } while ( !stopEvent.WaitOne( 100, false ) ); mediaControl.Stop( ); } } catch ( Exception exception ) { // provide information to clients if ( VideoSourceError != null ) { VideoSourceError( this, new VideoSourceErrorEventArgs( exception.Message ) ); } } finally { // release all objects captureGraph = null; graph = null; sourceBase = null; mediaControl = null; videoControl = null; mediaEvent = null; pinStillImage = null; crossbar = null; videoGrabberBase = null; snapshotGrabberBase = null; videoSampleGrabber = null; snapshotSampleGrabber = null; if ( graphObject != null ) { Marshal.ReleaseComObject( graphObject ); graphObject = null; } if ( sourceObject != null ) { Marshal.ReleaseComObject( sourceObject ); sourceObject = null; } if ( videoGrabberObject != null ) { Marshal.ReleaseComObject( videoGrabberObject ); videoGrabberObject = null; } if ( snapshotGrabberObject != null ) { Marshal.ReleaseComObject( snapshotGrabberObject ); snapshotGrabberObject = null; } if ( captureGraphObject != null ) { Marshal.ReleaseComObject( captureGraphObject ); captureGraphObject = null; } if ( crossbarObject != null ) { Marshal.ReleaseComObject( crossbarObject ); crossbarObject = null; } } if ( PlayingFinished != null ) { PlayingFinished( this, reasonToStop ); } }
// Thread entry point public void WorkerThread() { int hr; Guid cat; Guid med; // grabber Grabber grabber = new Grabber(this); // objects object graphObj = null; object grabberObj = null; // interfaces IGraphBuilder graphBuilder = null; ICaptureGraphBuilder2 captureGraphBuilder = null; IBaseFilter videoDeviceFilter = null; IBaseFilter grabberFilter = null; ISampleGrabber sg = null; IMediaControl mc = null; try { // Make a new filter graph graphObj = Activator.CreateInstance( Type.GetTypeFromCLSID(Clsid.FilterGraph, true)); graphBuilder = (IGraphBuilder)graphObj; // Get the Capture Graph Builder Guid clsid = Clsid.CaptureGraphBuilder2; Guid riid = typeof(ICaptureGraphBuilder2).GUID; captureGraphBuilder = (ICaptureGraphBuilder2) TempFix.CreateDsInstance(ref clsid, ref riid); // Link the CaptureGraphBuilder to the filter graph hr = captureGraphBuilder.SetFiltergraph(graphBuilder); if (hr < 0) Marshal.ThrowExceptionForHR(hr); // Get the video device and add it to the filter graph if (source != null) { videoDeviceFilter = (IBaseFilter) Marshal.BindToMoniker(source); hr = graphBuilder.AddFilter(videoDeviceFilter, "Video Capture Device"); if (hr < 0) Marshal.ThrowExceptionForHR(hr); } // create sample grabber, object and filter grabberObj = Activator.CreateInstance( Type.GetTypeFromCLSID(Clsid.SampleGrabber, true)); grabberFilter = (IBaseFilter)grabberObj; sg = (ISampleGrabber)grabberObj; // add sample grabber filter to filter graph hr = graphBuilder.AddFilter(grabberFilter, "grabber"); if (hr < 0) Marshal.ThrowExceptionForHR(hr); // Try looking for an video device interleaved media type IBaseFilter testFilter = videoDeviceFilter; // grabberFilter (not supported) object o; cat = PinCategory.Capture; med = MediaType.Interleaved; Guid iid = typeof(IAMStreamConfig).GUID; hr = captureGraphBuilder.FindInterface( ref cat, ref med, testFilter, ref iid, out o); if (hr != 0) { // If not found, try looking for a video media type med = MediaType.Video; hr = captureGraphBuilder.FindInterface( ref cat, ref med, testFilter, ref iid, out o); if (hr != 0) o = null; } // Set the video stream configuration to data member videoStreamConfig = o as IAMStreamConfig; o = null; // Experimental testing: Try to set the Frame Size & Rate // Results: When enabled, the grabber video breaks up into // several duplicate frames (6 frames) bool bdebug = true; if (bdebug) { BitmapInfoHeader bmiHeader; bmiHeader = (BitmapInfoHeader) getStreamConfigSetting(videoStreamConfig, "BmiHeader"); bmiHeader.Width = framesize.Width; bmiHeader.Height = framesize.Height; setStreamConfigSetting(videoStreamConfig, "BmiHeader", bmiHeader); long avgTimePerFrame = (long)(10000000 / framerate); setStreamConfigSetting(videoStreamConfig, "AvgTimePerFrame", avgTimePerFrame); } // connect pins (Turns on the video device) if (graphBuilder.Connect(DSTools.GetOutPin( videoDeviceFilter, 0), DSTools.GetInPin(grabberFilter, 0)) < 0) throw new ApplicationException( "Failed connecting filters"); // Set the sample grabber media type settings AMMediaType mt = new AMMediaType(); mt.majorType = MediaType.Video; mt.subType = MediaSubType.RGB24; sg.SetMediaType(mt); // get media type if (sg.GetConnectedMediaType(mt) == 0) { VideoInfoHeader vih = (VideoInfoHeader)Marshal.PtrToStructure(mt.formatPtr, typeof(VideoInfoHeader)); System.Diagnostics.Debug.WriteLine("width = " + vih.BmiHeader.Width + ", height = " + vih.BmiHeader.Height); grabber.Width = vih.BmiHeader.Width; grabber.Height = vih.BmiHeader.Height; mt.Dispose(); } // render graphBuilder.Render(DSTools.GetOutPin(grabberFilter, 0)); // Set various sample grabber properties sg.SetBufferSamples(false); sg.SetOneShot(false); sg.SetCallback(grabber, 1); // Do not show active (source) window IVideoWindow win = (IVideoWindow)graphObj; win.put_AutoShow(false); win = null; // get media control mc = (IMediaControl)graphObj; // run mc.Run(); while (!stopEvent.WaitOne(0, true)) { Thread.Sleep(100); } mc.StopWhenReady(); } // catch any exceptions catch (Exception e) { System.Diagnostics.Debug.WriteLine("----: " + e.Message); } // finalization block finally { // release all objects mc = null; graphBuilder = null; captureGraphBuilder = null; videoDeviceFilter = null; grabberFilter = null; sg = null; if (graphObj != null) { Marshal.ReleaseComObject(graphObj); graphObj = null; } if (grabberObj != null) { Marshal.ReleaseComObject(grabberObj); grabberObj = null; } } }
/// <summary> /// Worker thread. /// </summary> /// private void WorkerThread( ) { ReasonToFinishPlaying reasonToStop = ReasonToFinishPlaying.StoppedByUser; // grabber Grabber grabber = new Grabber( this ); // objects object graphObject = null; object grabberObject = null; // interfaces IGraphBuilder graph = null; IBaseFilter sourceBase = null; IBaseFilter grabberBase = null; ISampleGrabber sampleGrabber = null; IMediaControl mediaControl = null; IMediaEventEx mediaEvent = null; try { // get type for filter graph Type type = Type.GetTypeFromCLSID( Clsid.FilterGraph ); if ( type == null ) throw new ApplicationException( "Failed creating filter graph" ); // create filter graph graphObject = Activator.CreateInstance( type ); graph = (IGraphBuilder) graphObject; // create source device's object graph.AddSourceFilter( fileName, "source", out sourceBase ); if ( sourceBase == null ) throw new ApplicationException( "Failed creating source filter" ); // get type for sample grabber type = Type.GetTypeFromCLSID( Clsid.SampleGrabber ); if ( type == null ) throw new ApplicationException( "Failed creating sample grabber" ); // create sample grabber grabberObject = Activator.CreateInstance( type ); sampleGrabber = (ISampleGrabber) grabberObject; grabberBase = (IBaseFilter) grabberObject; // add grabber filters to graph graph.AddFilter( grabberBase, "grabber" ); // set media type AMMediaType mediaType = new AMMediaType( ); mediaType.MajorType = MediaType.Video; mediaType.SubType = MediaSubType.RGB24; sampleGrabber.SetMediaType( mediaType ); // connect pins int pinToTry = 0; IPin inPin = Tools.GetInPin( grabberBase, 0 ); IPin outPin = null; // find output pin acceptable by sample grabber while ( true ) { outPin = Tools.GetOutPin( sourceBase, pinToTry ); if ( outPin == null ) { Marshal.ReleaseComObject( inPin ); throw new ApplicationException( "Did not find acceptable output video pin in the given source" ); } if ( graph.Connect( outPin, inPin ) < 0 ) { Marshal.ReleaseComObject( outPin ); outPin = null; pinToTry++; } else { break; } } Marshal.ReleaseComObject( outPin ); Marshal.ReleaseComObject( inPin ); // get media type if ( sampleGrabber.GetConnectedMediaType( mediaType ) == 0 ) { VideoInfoHeader vih = (VideoInfoHeader) Marshal.PtrToStructure( mediaType.FormatPtr, typeof( VideoInfoHeader ) ); grabber.Width = vih.BmiHeader.Width; grabber.Height = vih.BmiHeader.Height; mediaType.Dispose( ); } // let's do rendering, if we don't need to prevent freezing if ( !preventFreezing ) { // render pin graph.Render( Tools.GetOutPin( grabberBase, 0 ) ); // configure video window IVideoWindow window = (IVideoWindow) graphObject; window.put_AutoShow( false ); window = null; } // configure sample grabber sampleGrabber.SetBufferSamples( false ); sampleGrabber.SetOneShot( false ); sampleGrabber.SetCallback( grabber, 1 ); // disable clock, if someone requested it if ( !referenceClockEnabled ) { IMediaFilter mediaFilter = (IMediaFilter) graphObject; mediaFilter.SetSyncSource( null ); } // get media control mediaControl = (IMediaControl) graphObject; // get media events' interface mediaEvent = (IMediaEventEx) graphObject; IntPtr p1, p2; DsEvCode code; // run mediaControl.Run( ); do { if ( mediaEvent != null ) { if ( mediaEvent.GetEvent( out code, out p1, out p2, 0 ) >= 0 ) { mediaEvent.FreeEventParams( code, p1, p2 ); if ( code == DsEvCode.Complete ) { reasonToStop = ReasonToFinishPlaying.EndOfStreamReached; break; } } } } while ( !stopEvent.WaitOne( 100, false ) ); mediaControl.Stop( ); } catch ( Exception exception ) { // provide information to clients if ( VideoSourceError != null ) { VideoSourceError( this, new VideoSourceErrorEventArgs( exception.Message ) ); } } finally { // release all objects graph = null; grabberBase = null; sampleGrabber = null; mediaControl = null; mediaEvent = null; if ( graphObject != null ) { Marshal.ReleaseComObject( graphObject ); graphObject = null; } if ( sourceBase != null ) { Marshal.ReleaseComObject( sourceBase ); sourceBase = null; } if ( grabberObject != null ) { Marshal.ReleaseComObject( grabberObject ); grabberObject = null; } } if ( PlayingFinished != null ) { PlayingFinished( this, reasonToStop ); } }
private void WorkerThread( bool runGraph ) { // grabber Grabber grabber = new Grabber( this ); // objects object captureGraphObject = null; object graphObject = null; object grabberObject = null; // interfaces ICaptureGraphBuilder2 captureGraph = null; IFilterGraph2 graph = null; IBaseFilter sourceBase = null; IBaseFilter grabberBase = null; ISampleGrabber sampleGrabber = null; IMediaControl mediaControl = null; try { // get type of capture graph builder Type type = Type.GetTypeFromCLSID( Clsid.CaptureGraphBuilder2 ); if ( type == null ) throw new ApplicationException( "Failed creating capture graph builder" ); // create capture graph builder captureGraphObject = Activator.CreateInstance( type ); captureGraph = (ICaptureGraphBuilder2) captureGraphObject; // get type of filter graph type = Type.GetTypeFromCLSID( Clsid.FilterGraph ); if ( type == null ) throw new ApplicationException( "Failed creating filter graph" ); // create filter graph graphObject = Activator.CreateInstance( type ); graph = (IFilterGraph2) graphObject; // set filter graph to the capture graph builder captureGraph.SetFiltergraph( (IGraphBuilder) graph ); // create source device's object sourceObject = FilterInfo.CreateFilter( deviceMoniker ); if ( sourceObject == null ) throw new ApplicationException( "Failed creating device object for moniker" ); // get base filter interface of source device sourceBase = (IBaseFilter) sourceObject; // get type of sample grabber type = Type.GetTypeFromCLSID( Clsid.SampleGrabber ); if ( type == null ) throw new ApplicationException( "Failed creating sample grabber" ); // create sample grabber grabberObject = Activator.CreateInstance( type ); sampleGrabber = (ISampleGrabber) grabberObject; grabberBase = (IBaseFilter) grabberObject; // add source and grabber filters to graph graph.AddFilter( sourceBase, "source" ); graph.AddFilter( grabberBase, "grabber" ); // set media type AMMediaType mediaType = new AMMediaType( ); mediaType.MajorType = MediaType.Video; mediaType.SubType = MediaSubType.RGB24; sampleGrabber.SetMediaType( mediaType ); // configure sample grabber sampleGrabber.SetBufferSamples( false ); sampleGrabber.SetOneShot( false ); sampleGrabber.SetCallback( grabber, 1 ); // check if it is required to change capture settings if ( ( desiredFrameRate != 0 ) || ( ( desiredFrameSize.Width != 0 ) && ( desiredFrameSize.Height != 0 ) ) ) { object streamConfigObject; // get stream configuration object captureGraph.FindInterface( PinCategory.Capture, MediaType.Video, sourceBase, typeof( IAMStreamConfig ).GUID, out streamConfigObject ); if ( streamConfigObject != null ) { IAMStreamConfig streamConfig = (IAMStreamConfig) streamConfigObject; if ( videoCapabilities == null ) { // get all video capabilities try { videoCapabilities = AForge.Video.DirectShow.VideoCapabilities.FromStreamConfig( streamConfig ); } catch { } } // get current format streamConfig.GetFormat( out mediaType ); VideoInfoHeader infoHeader = (VideoInfoHeader) Marshal.PtrToStructure( mediaType.FormatPtr, typeof( VideoInfoHeader ) ); // change frame size if required if ( ( desiredFrameSize.Width != 0 ) && ( desiredFrameSize.Height != 0 ) ) { infoHeader.BmiHeader.Width = desiredFrameSize.Width; infoHeader.BmiHeader.Height = desiredFrameSize.Height; } // change frame rate if required if ( desiredFrameRate != 0 ) { infoHeader.AverageTimePerFrame = 10000000 / desiredFrameRate; } // copy the media structure back Marshal.StructureToPtr( infoHeader, mediaType.FormatPtr, false ); // set the new format streamConfig.SetFormat( mediaType ); mediaType.Dispose( ); } } else { if ( videoCapabilities == null ) { object streamConfigObject; // get stream configuration object captureGraph.FindInterface( PinCategory.Capture, MediaType.Video, sourceBase, typeof( IAMStreamConfig ).GUID, out streamConfigObject ); if ( streamConfigObject != null ) { IAMStreamConfig streamConfig = (IAMStreamConfig) streamConfigObject; // get all video capabilities try { videoCapabilities = AForge.Video.DirectShow.VideoCapabilities.FromStreamConfig( streamConfig ); } catch { } } } } if ( runGraph ) { // render source device on sample grabber captureGraph.RenderStream( PinCategory.Capture, MediaType.Video, sourceBase, null, grabberBase ); // get media type if ( sampleGrabber.GetConnectedMediaType( mediaType ) == 0 ) { VideoInfoHeader vih = (VideoInfoHeader) Marshal.PtrToStructure( mediaType.FormatPtr, typeof( VideoInfoHeader ) ); grabber.Width = vih.BmiHeader.Width; grabber.Height = vih.BmiHeader.Height; mediaType.Dispose( ); } // get media control mediaControl = (IMediaControl) graphObject; // run mediaControl.Run( ); while ( !stopEvent.WaitOne( 0, true ) ) { Thread.Sleep( 100 ); if ( needToDisplayPropertyPage ) { needToDisplayPropertyPage = false; try { // retrieve ISpecifyPropertyPages interface of the device ISpecifyPropertyPages pPropPages = (ISpecifyPropertyPages) sourceObject; // get property pages from the property bag CAUUID caGUID; pPropPages.GetPages( out caGUID ); // get filter info FilterInfo filterInfo = new FilterInfo( deviceMoniker ); // create and display the OlePropertyFrame Win32.OleCreatePropertyFrame( parentWindowForPropertyPage, 0, 0, filterInfo.Name, 1, ref sourceObject, caGUID.cElems, caGUID.pElems, 0, 0, IntPtr.Zero ); // release COM objects Marshal.FreeCoTaskMem( caGUID.pElems ); } catch { } } } mediaControl.StopWhenReady( ); } } catch ( Exception exception ) { // provide information to clients if ( VideoSourceError != null ) { VideoSourceError( this, new VideoSourceErrorEventArgs( exception.Message ) ); } } finally { // release all objects captureGraph = null; graph = null; sourceBase = null; grabberBase = null; sampleGrabber = null; mediaControl = null; if ( graphObject != null ) { Marshal.ReleaseComObject( graphObject ); graphObject = null; } if ( sourceObject != null ) { Marshal.ReleaseComObject( sourceObject ); sourceObject = null; } if ( grabberObject != null ) { Marshal.ReleaseComObject( grabberObject ); grabberObject = null; } if ( captureGraphObject != null ) { Marshal.ReleaseComObject( captureGraphObject ); captureGraphObject = null; } } if ( PlayingFinished != null ) { PlayingFinished( this, ReasonToFinishPlaying.StoppedByUser ); } }