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, videoResolution, ref videoCapabilities ); if ( isSapshotSupported ) { GetPinCapabilitiesAndConfigureSizeAndRate( captureGraph, sourceBase, PinCategory.StillImage, snapshotResolution, 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 ); } }
/// <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 ); } }