C# IFilterGraph2.AddSourceFilter方法代码示例

        private void StartCapture()
        {
            int hr;

            ISampleGrabber sampGrabber = null;
            IBaseFilter capFilter = null;
            ICaptureGraphBuilder2 capGraph = null;

            if (System.IO.File.Exists(txtAviFileName.Text))
            {
                // Get the graphbuilder object
                m_FilterGraph = (IFilterGraph2) new FilterGraph();
                m_mediaCtrl = m_FilterGraph as IMediaControl;

                // Get the ICaptureGraphBuilder2
                capGraph = (ICaptureGraphBuilder2) new CaptureGraphBuilder2();

                // Get the SampleGrabber interface
                sampGrabber = (ISampleGrabber) new SampleGrabber();

                // Start building the graph
                hr = capGraph.SetFiltergraph(m_FilterGraph);
                DsError.ThrowExceptionForHR(hr);

                // Add the video source
                hr = m_FilterGraph.AddSourceFilter(txtAviFileName.Text, "File Source (Async.)", out capFilter);
                DsError.ThrowExceptionForHR(hr);

                //add AVI Decompressor
                IBaseFilter pAVIDecompressor = (IBaseFilter) new AVIDec();
                hr = m_FilterGraph.AddFilter(pAVIDecompressor, "AVI Decompressor");
                DsError.ThrowExceptionForHR(hr);

                IBaseFilter ffdshow;
                try
                {
                    // Create Decoder filter COM object (ffdshow video decoder)
                    Type comtype = Type.GetTypeFromCLSID(new Guid("{04FE9017-F873-410E-871E-AB91661A4EF7}"));
                    if (comtype == null)
                        throw new NotSupportedException("Creating ffdshow video decoder COM object fails.");
                    object comobj = Activator.CreateInstance(comtype);
                    ffdshow = (IBaseFilter) comobj; // error ocurrs! raised exception
                    comobj = null;
                }
                catch
                {
                    CustomMessageBox.Show("Please install/reinstall ffdshow");
                    return;
                }

                hr = m_FilterGraph.AddFilter(ffdshow, "ffdshow");
                DsError.ThrowExceptionForHR(hr);

                //
                IBaseFilter baseGrabFlt = (IBaseFilter) sampGrabber;
                ConfigureSampleGrabber(sampGrabber);

                // Add the frame grabber to the graph
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);


                IBaseFilter vidrender = (IBaseFilter) new VideoRenderer();
                hr = m_FilterGraph.AddFilter(vidrender, "Render");
                DsError.ThrowExceptionForHR(hr);


                IPin captpin = DsFindPin.ByDirection(capFilter, PinDirection.Output, 0);

                IPin ffdpinin = DsFindPin.ByName(ffdshow, "In");

                IPin ffdpinout = DsFindPin.ByName(ffdshow, "Out");

                IPin samppin = DsFindPin.ByName(baseGrabFlt, "Input");

                hr = m_FilterGraph.Connect(captpin, ffdpinin);
                DsError.ThrowExceptionForHR(hr);
                hr = m_FilterGraph.Connect(ffdpinout, samppin);
                DsError.ThrowExceptionForHR(hr);

                FileWriter filewritter = new FileWriter();
                IFileSinkFilter filemux = (IFileSinkFilter) filewritter;
                //filemux.SetFileName("test.avi",);

                //hr = capGraph.RenderStream(null, MediaType.Video, capFilter, null, vidrender);
                // DsError.ThrowExceptionForHR(hr); 

                SaveSizeInfo(sampGrabber);

                // setup buffer
                if (m_handle == IntPtr.Zero)
                    m_handle = Marshal.AllocCoTaskMem(m_stride*m_videoHeight);

                // tell the callback to ignore new images
                m_PictureReady = new ManualResetEvent(false);
                m_bGotOne = false;
                m_bRunning = false;

                timer1 = new Thread(timer);
                timer1.IsBackground = true;
//.........这里部分代码省略.........

        // Build the capture graph for grabber and renderer.</summary>
        // (Control to show video in, Filename to play)
        private void SetupGraph(string FileName)
        {
            int hr;

            // Get the graphbuilder object
            m_FilterGraph = new FilterGraph() as IFilterGraph2;

            // Get a ICaptureGraphBuilder2 to help build the graph
            ICaptureGraphBuilder2 icgb2 = new CaptureGraphBuilder2() as ICaptureGraphBuilder2;

            try
            {
                // Link the ICaptureGraphBuilder2 to the IFilterGraph2
                hr = icgb2.SetFiltergraph(m_FilterGraph);
                DsError.ThrowExceptionForHR(hr);

                // Add the filters necessary to render the file.  This function will
                // work with a number of different file types.
                IBaseFilter sourceFilter = null;
                hr = m_FilterGraph.AddSourceFilter(FileName, FileName, out sourceFilter);
                DsError.ThrowExceptionForHR(hr);

                // Get the SampleGrabber interface
                m_sampGrabber = (ISampleGrabber)new SampleGrabber();
                IBaseFilter baseGrabFlt = (IBaseFilter)m_sampGrabber;

                // Configure the Sample Grabber
                ConfigureSampleGrabber(m_sampGrabber);

                // Add it to the filter
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);

                // Add the null renderer to the graph
                IBaseFilter nullrenderer = new NullRenderer() as IBaseFilter;
                hr = m_FilterGraph.AddFilter(nullrenderer, "Null renderer");
                DsError.ThrowExceptionForHR(hr);

                // Connect the pieces together, use the default renderer
                hr = icgb2.RenderStream(null, null, sourceFilter, baseGrabFlt, nullrenderer);
                DsError.ThrowExceptionForHR(hr);

                // Now that the graph is built, read the dimensions of the bitmaps we'll be getting
                SaveSizeInfo(m_sampGrabber);

                // Grab some other interfaces
                m_mediaEvent = m_FilterGraph as IMediaEvent;
                m_mediaCtrl = m_FilterGraph as IMediaControl;
            }
            finally
            {
                if (icgb2 != null)
                {
                    Marshal.ReleaseComObject(icgb2);
                    icgb2 = null;
                }
            }
            #if DEBUG
            // Double check to make sure we aren't releasing something
            // important.
            GC.Collect();
            GC.WaitForPendingFinalizers();
            #endif
        }

        /// <summary> build the capture graph for grabber. </summary>
        private void SetupGraph(string FileName)
        {
            int hr;

            ISampleGrabber sampGrabber = null;
            IBaseFilter baseGrabFlt = null;
            IBaseFilter capFilter = null;
            IBaseFilter nullrenderer = null;

            // Get the graphbuilder object
            m_FilterGraph = new FilterGraph() as IFilterGraph2;
            m_mediaCtrl = m_FilterGraph as IMediaControl;
            m_MediaEvent = m_FilterGraph as IMediaEvent;

            IMediaFilter mediaFilt = m_FilterGraph as IMediaFilter;

            try
            {
            #if DEBUG
                m_rot = new DsROTEntry(m_FilterGraph);
            #endif

                // Add the video source
                hr = m_FilterGraph.AddSourceFilter(FileName, "Ds.NET FileFilter", out capFilter);
                DsError.ThrowExceptionForHR(hr);

                // Get the SampleGrabber interface
                sampGrabber = new SampleGrabber() as ISampleGrabber;
                baseGrabFlt = sampGrabber as IBaseFilter;

                ConfigureSampleGrabber(sampGrabber);

                // Add the frame grabber to the graph
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);

                // ---------------------------------
                // Connect the file filter to the sample grabber

                // Hopefully this will be the video pin, we could check by reading it's mediatype
                IPin iPinOut = DsFindPin.ByDirection(capFilter, PinDirection.Output, 0);

                // Get the input pin from the sample grabber
                IPin iPinIn = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);

                hr = m_FilterGraph.Connect(iPinOut, iPinIn);
                DsError.ThrowExceptionForHR(hr);

                // Add the null renderer to the graph
                nullrenderer = new NullRenderer() as IBaseFilter;
                hr = m_FilterGraph.AddFilter(nullrenderer, "Null renderer");
                DsError.ThrowExceptionForHR(hr);

                // ---------------------------------
                // Connect the sample grabber to the null renderer

                iPinOut = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Output, 0);
                iPinIn = DsFindPin.ByDirection(nullrenderer, PinDirection.Input, 0);

                hr = m_FilterGraph.Connect(iPinOut, iPinIn);
                DsError.ThrowExceptionForHR(hr);

                // Turn off the clock.  This causes the frames to be sent
                // thru the graph as fast as possible
                hr = mediaFilt.SetSyncSource(null);
                DsError.ThrowExceptionForHR(hr);

                // Read and cache the image sizes
                SaveSizeInfo(sampGrabber);
            }
            finally
            {
                if (capFilter != null)
                {
                    Marshal.ReleaseComObject(capFilter);
                    capFilter = null;
                }
                if (sampGrabber != null)
                {
                    Marshal.ReleaseComObject(sampGrabber);
                    sampGrabber = null;
                }
                if (nullrenderer != null)
                {
                    Marshal.ReleaseComObject(nullrenderer);
                    nullrenderer = null;
                }
            }
        }

        /// <summary> build the capture graph for grabber. </summary>
        private void SetupGraph(string FileName, Control hWin)
        {
            int hr;

            IBaseFilter ibfRenderer = null;
            ISampleGrabber sampGrabber = null;
            IBaseFilter capFilter = null;
            IPin iPinInFilter = null;
            IPin iPinOutFilter = null;
            IPin iPinInDest = null;
            IBasicAudio basicAudio = null;

            // Get the graphbuilder object
            m_FilterGraph = new FilterGraph() as IFilterGraph2;
            #if DEBUG
            m_rot = new DsROTEntry(m_FilterGraph);
            #endif

            try
            {
                // Get the SampleGrabber interface
                sampGrabber = new SampleGrabber() as ISampleGrabber;

                // Add the video source
                hr = m_FilterGraph.AddSourceFilter(FileName, "Ds.NET FileFilter", out capFilter);
                DsError.ThrowExceptionForHR(hr);

                // Hopefully this will be the video pin
                IPin iPinOutSource = DsFindPin.ByDirection(capFilter, PinDirection.Output, 0);

                IBaseFilter baseGrabFlt = sampGrabber as IBaseFilter;
                ConfigureSampleGrabber(sampGrabber);

                iPinInFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);
                iPinOutFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Output, 0);

                // Add the frame grabber to the graph
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);

                hr = m_FilterGraph.Connect(iPinOutSource, iPinInFilter);
                DsError.ThrowExceptionForHR(hr);

                // Get the default video renderer
                ibfRenderer = (IBaseFilter)new VideoRendererDefault();

                // Add it to the graph
                hr = m_FilterGraph.AddFilter(ibfRenderer, "Ds.NET VideoRendererDefault");
                DsError.ThrowExceptionForHR(hr);
                iPinInDest = DsFindPin.ByDirection(ibfRenderer, PinDirection.Input, 0);

                // Connect the graph.  Many other filters automatically get added here
                hr = m_FilterGraph.Connect(iPinOutFilter, iPinInDest);
                DsError.ThrowExceptionForHR(hr);

                SaveSizeInfo(sampGrabber);

                // Set the output window

                IVideoWindow videoWindow = m_FilterGraph as IVideoWindow;
                hr = videoWindow.put_Owner(hWin.Handle);
                DsError.ThrowExceptionForHR(hr);

                hr = videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipChildren | WindowStyle.ClipSiblings);
                DsError.ThrowExceptionForHR(hr);

                hr = videoWindow.put_Visible(OABool.True);
                DsError.ThrowExceptionForHR(hr);

                //TODO : Need a better way to hide the video in the parent Window
                Rectangle rc = hWin.ClientRectangle;
                if (mParentWindowDisplay)
                    hr = videoWindow.SetWindowPosition(0, 0, rc.Right, rc.Bottom);
                else
                    hr = videoWindow.SetWindowPosition(0, 0, 0, 0);
                DsError.ThrowExceptionForHR(hr);

                IGraphBuilder graphBuilder = m_FilterGraph as IGraphBuilder;
                ICaptureGraphBuilder2 captureGraphBuilder = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();

                // Attach the filter graph to the capture graph
                hr = captureGraphBuilder.SetFiltergraph(graphBuilder);
                DsError.ThrowExceptionForHR(hr);

                hr = captureGraphBuilder.RenderStream(null, MediaType.Audio, capFilter, null, null);

            }
            finally
            {
                if (capFilter != null)
                {
                    Marshal.ReleaseComObject(capFilter);
                    capFilter = null;
                }
                if (sampGrabber != null)
                {
                    Marshal.ReleaseComObject(sampGrabber);
                    sampGrabber = null;
                }
//.........这里部分代码省略.........

        // Build the capture graph for grabber and renderer.</summary>
        // (Control to show video in, Filename to play)
        private void SetupGraph(Control hWin, string FileName)
        {
            int hr;

            IBaseFilter ibfRenderer = null;
            IPin iPinInFilter = null;
            IPin iPinOutFilter = null;
            IPin iPinInDest = null;

            m_FilterGraph = new FilterGraph() as IFilterGraph2;

            ICaptureGraphBuilder2 icgb2 = new CaptureGraphBuilder2() as ICaptureGraphBuilder2;

            try
            {
                hr = icgb2.SetFiltergraph(m_FilterGraph);
                DsError.ThrowExceptionForHR(hr);

                IBaseFilter sourceFilter = null;
                hr = m_FilterGraph.AddSourceFilter(FileName, "Ds.NET FileFilter", out sourceFilter);
                DsError.ThrowExceptionForHR(hr);

                // Hopefully this will be the video pin
                IPin iPinOutSource = DsFindPin.ByDirection(sourceFilter, PinDirection.Output, 0);

                // Get the SampleGrabber interface
                m_sampGrabber = (ISampleGrabber)new SampleGrabber();
                IBaseFilter baseGrabFlt = (IBaseFilter)m_sampGrabber;

                // Configure the Sample Grabber
                ConfigureSampleGrabber(m_sampGrabber);

                iPinInFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Input, 0);
                iPinOutFilter = DsFindPin.ByDirection(baseGrabFlt, PinDirection.Output, 0);

                // Add it to the filter
                hr = m_FilterGraph.AddFilter(baseGrabFlt, "Ds.NET Grabber");
                DsError.ThrowExceptionForHR(hr);

                hr = m_FilterGraph.Connect(iPinOutSource, iPinInFilter);
                DsError.ThrowExceptionForHR(hr);

                // Get the default video renderer
                ibfRenderer = (IBaseFilter)new VideoRendererDefault();

                // Add it to the graph
                hr = m_FilterGraph.AddFilter(ibfRenderer, "Ds.NET VideoRendererDefault");
                DsError.ThrowExceptionForHR(hr);
                iPinInDest = DsFindPin.ByDirection(ibfRenderer, PinDirection.Input, 0);

                // Connect the graph.  Many other filters automatically get added here
                hr = m_FilterGraph.Connect(iPinOutFilter, iPinInDest);
                DsError.ThrowExceptionForHR(hr);

                // Configure the Video Window
                IVideoWindow videoWindow = m_FilterGraph as IVideoWindow;
                ConfigureVideoWindow(videoWindow, hWin);

                // Grab some other interfaces
                m_mediaEvent = m_FilterGraph as IMediaEvent;
                m_mediaCtrl = m_FilterGraph as IMediaControl;
                m_mediaPosition = m_FilterGraph as IMediaPosition;
            }
            finally
            {
                if (icgb2 != null)
                {
                    Marshal.ReleaseComObject(icgb2);
                    icgb2 = null;
                }
            }
        }

        // Build the capture graph for grabber and renderer.</summary>
        // (Control to show video in, Filename to play)
        private void SetupGraph(Control hWin, string FileName)
        {
            int hr;

            m_FilterGraph = new FilterGraph() as IFilterGraph2;

            ICaptureGraphBuilder2 icgb2 = new CaptureGraphBuilder2() as ICaptureGraphBuilder2;

            try
            {
                hr = icgb2.SetFiltergraph(m_FilterGraph);
                DsError.ThrowExceptionForHR(hr);

                IBaseFilter sourceFilter = null;
                hr = m_FilterGraph.AddSourceFilter(FileName, FileName, out sourceFilter);
                DsError.ThrowExceptionForHR( hr );

                // Get the SampleGrabber interface
                m_sampGrabber = (ISampleGrabber) new SampleGrabber();
                IBaseFilter baseGrabFlt = (IBaseFilter)	m_sampGrabber;

                // Configure the Sample Grabber
                ConfigureSampleGrabber(m_sampGrabber);

                // Add it to the filter
                hr = m_FilterGraph.AddFilter( baseGrabFlt, "Ds.NET Grabber" );
                DsError.ThrowExceptionForHR( hr );

                // Connect the pieces together, use the default renderer
                hr = icgb2.RenderStream(null, null, sourceFilter, baseGrabFlt, null);
                DsError.ThrowExceptionForHR( hr );

                // Configure the Video Window
                IVideoWindow videoWindow = m_FilterGraph as IVideoWindow;
                ConfigureVideoWindow(videoWindow, hWin);

                // Grab some other interfaces
                m_mediaEvent = m_FilterGraph as IMediaEvent;
                m_mediaCtrl = m_FilterGraph as IMediaControl;
            }
            finally
            {
                if (icgb2 != null)
                {
                    Marshal.ReleaseComObject(icgb2);
                    icgb2 = null;
                }
            }
        }