C# IGraphBuilder类代码示例

        public static IBaseFilter CreateAudioCompressor(DisposalCleanup dc, IGraphBuilder graph, IPin outPin,
                                                        AudioFormat settings)
        {
            if (dc == null) throw new ArgumentNullException("dc");
            if (graph == null) throw new ArgumentNullException("graph");
            if (outPin == null) throw new ArgumentNullException("outPin");
            if (settings == null) throw new ArgumentNullException("settings");

            int hr = 0;

            using (AudioCompressor compressor = AudioCompressorFactory.Create(settings))
            {
                IBaseFilter compressorFilter = compressor.Filter;
                dc.Add(compressorFilter);

                hr = graph.AddFilter(compressorFilter, settings.AudioCompressor);
                DsError.ThrowExceptionForHR(hr);

                FilterGraphTools.ConnectFilters(graph, outPin, compressorFilter, true);

                // set the media type on the output pin of the compressor
                if (compressor.MediaType != null)
                {
                    FilterGraphTools.SetFilterFormat(compressor.MediaType, compressorFilter);
                }

                return compressorFilter;
            }
        }

 protected override void SetupFilterGraph(IFilterGraph graph)
 {
     _audioEngine = new X3DAudioEngine();
     _graph = graph as IGraphBuilder;
     base.SetupFilterGraph(graph);
     SetupAudio();
 }

        public static IBaseFilter RenderAsfWriterWithProfile(DisposalCleanup dc, IGraphBuilder graph, string profileData,
                                                             string outputFile)
        {
            if (dc == null) throw new ArgumentNullException("dc");
            if (graph == null) throw new ArgumentNullException("graph");
            if (string.IsNullOrEmpty(profileData)) throw new ArgumentNullException("profileData");
            if (string.IsNullOrEmpty(outputFile)) throw new ArgumentNullException("outputFile");

            int hr = 0;

            var asfWriterFilter = (IBaseFilter) new WMAsfWriter();
            dc.Add(asfWriterFilter);
            hr = graph.AddFilter(asfWriterFilter, Resources.DefaultAsfWriterName);
            DsError.ThrowExceptionForHR(hr);

            // Create an appropriate IWMProfile from the data
            IWMProfileManager profileManager = ProfileManager.CreateInstance();
            dc.Add(profileManager);

            IntPtr wmProfile = profileManager.LoadProfileByData(profileData);
            dc.Add(wmProfile);

            // Set the profile on the writer
            var configWriter = (IConfigAsfWriter2) asfWriterFilter;
            configWriter.ConfigureFilterUsingProfile(wmProfile);

            hr = ((IFileSinkFilter) asfWriterFilter).SetFileName(outputFile, null);
            DsError.ThrowExceptionForHR(hr);

            return asfWriterFilter;
        }

        // Starts playing a new cinematic
        public void PlayCinematic(string file, int x, int y, int w, int h)
        {
            // Lame bugfix: DirectShow and Fullscreen doesnt like eachother
            if (CVars.Instance.Get("r_fs", "0", CVarFlags.ARCHIVE).Integer == 1)
            {
                if (AlterGameState)
                {
                    playing = true;
                    StopCinematic();
                }
                return;
            }

            // Check if file exists
            if (FileCache.Instance.Contains(file))
                file = FileCache.Instance.GetFile(file).FullName;
            else
            {
                if (AlterGameState)
                {
                    playing = true;
                    StopCinematic();
                }
                Common.Instance.WriteLine("PlayCinematic: Could not find video: {0}", file);
                return;
            }

            // Have the graph builder construct its the appropriate graph automatically
            this.graphBuilder = (IGraphBuilder)new FilterGraph();
            int hr = graphBuilder.RenderFile(file, null);
            DsError.ThrowExceptionForHR(hr);

            mediaControl = (IMediaControl)this.graphBuilder;
            mediaEventEx = (IMediaEventEx)this.graphBuilder;
            videoWindow = this.graphBuilder as IVideoWindow;
            basicVideo = this.graphBuilder as IBasicVideo;

            // Setup the video window
            hr = this.videoWindow.put_Owner(Renderer.Instance.form.Handle);
            DsError.ThrowExceptionForHR(hr);
            hr = this.videoWindow.put_WindowStyle(WindowStyle.Child | WindowStyle.ClipSiblings | WindowStyle.ClipChildren);
            DsError.ThrowExceptionForHR(hr);

            // Set the video size
            //int lWidth, lHeight;
            //hr = this.basicVideo.GetVideoSize(out lWidth, out lHeight);
            hr = this.videoWindow.SetWindowPosition(x, y, w, h);
            videoWindow.put_FullScreenMode((CVars.Instance.Get("r_fs", "0", CVarFlags.ARCHIVE).Integer == 1) ? OABool.True : OABool.False);
            DsError.ThrowExceptionForHR(hr);

            // Run the graph to play the media file
            hr = this.mediaControl.Run();
            DsError.ThrowExceptionForHR(hr);
            playing = true;
            if (AlterGameState)
                Client.Instance.state = CubeHags.common.ConnectState.CINEMATIC;
            Common.Instance.WriteLine("Playing cinematic: {0}", file);

            EventCode code;
        }

        public static IBaseFilter AddFilterFromClsid(IGraphBuilder graphBuilder, Guid clsid, string name)
        {
            int hr = 0;
            IBaseFilter filter = null;

            if (graphBuilder == null)
                throw new ArgumentNullException("graphBuilder");

            try
            {
                Type type = Type.GetTypeFromCLSID(clsid);
                filter = (IBaseFilter)Activator.CreateInstance(type);

                hr = graphBuilder.AddFilter(filter, name);
                DsError.ThrowExceptionForHR(hr);
            }
            catch
            {
                if (filter != null)
                {
                    Marshal.ReleaseComObject(filter);
                    filter = null;
                }
            }

            return filter;
        }

        private void GetInterface()
        {
            object o;
            int hr;

            m_pGraph = (IGraphBuilder)new FilterGraph();
            IBaseFilter pSource;
            hr = m_pGraph.AddSourceFilter(@"C:\SourceForge\mflib\Test\Media\AspectRatio4x3.wmv", null, out pSource);
            DsError.ThrowExceptionForHR(hr);
            IBaseFilter pEVR = (IBaseFilter)new EnhancedVideoRenderer();
            hr = m_pGraph.AddFilter(pEVR, "EVR");
            DsError.ThrowExceptionForHR(hr);

            ICaptureGraphBuilder2 cgb;
            cgb = (ICaptureGraphBuilder2)new CaptureGraphBuilder2();

            hr = cgb.SetFiltergraph(m_pGraph);
            DsError.ThrowExceptionForHR(hr);
            hr = cgb.RenderStream(null, MediaType.Video, pSource, null, pEVR);
            DsError.ThrowExceptionForHR(hr);

            IMFGetService gs = pEVR as IMFGetService;
            hr = gs.GetService(MFServices.MR_VIDEO_MIXER_SERVICE, typeof(IMFVideoProcessor).GUID, out o);
            MFError.ThrowExceptionForHR(hr);

            m_vp = o as IMFVideoProcessor;
        }

    public static void EnableFFDShowSubtitles(IGraphBuilder graphBuilder)
    {
      // no instance of engine yet created or no ffdshow api, try to find it
      IBaseFilter baseFilter = null;
      DirectShowUtil.FindFilterByClassID(graphBuilder, FFDShowAPI.FFDShowVideoGuid, out baseFilter);
      if (baseFilter == null)
        DirectShowUtil.FindFilterByClassID(graphBuilder, FFDShowAPI.FFDShowVideoDXVAGuid, out baseFilter);
      if (baseFilter == null)
        DirectShowUtil.FindFilterByClassID(graphBuilder, FFDShowAPI.FFDShowVideoRawGuid, out baseFilter);

      if (baseFilter != null)
      {
        IffdshowDec ffdshowDec = baseFilter as IffdshowDec;
        if (ffdshowDec != null)
        {
          // use a temporary instance of the API, as it is only used here, to disable subs
          FFDShowAPI tempffdshowAPI = new FFDShowAPI((object)baseFilter);
          tempffdshowAPI.DoShowSubtitles = true;
          Log.Info("FFDshow interfaces found -> Subtitles disabled");
          tempffdshowAPI.Dispose();
        }
        else
        {
          DirectShowUtil.ReleaseComObject(baseFilter);
        }
      }
    } 

 public ProfileAndMachineParser(IGraphBuilder graphBuilder, XmlNode structureMapNode, XmlMementoCreator creator)
 {
     _profileBuilder = graphBuilder.GetProfileBuilder();
     _graphBuilder = graphBuilder;
     _structureMapNode = structureMapNode;
     _creator = creator;
 }

        public static IBaseFilter AddFilterById(IGraphBuilder graph, Guid guid, string name)
        {
            Ensure.IsNotNull(Log, graph, "graph is null");

            IBaseFilter filter = null;

            try
            {
                var type = Type.GetTypeFromCLSID(guid);
                filter = (IBaseFilter)Activator.CreateInstance(type);

                var hr = graph.AddFilter(filter, name);
                DsError.ThrowExceptionForHR(hr);
            }
            catch (Exception ex)
            {
                if (filter != null)
                {
                    graph.RemoveFilter(filter);
                    Marshal.ReleaseComObject(filter);
                    filter = null;
                }

                Log.Fatal(string.Format("Filter {0} is not added to the graph", name) + ex);
            }

            return filter;
        }

        /// <summary>Adds a graph to the ROT.</summary>
        /// <param name="graph">The graph to be added.</param>
        /// <returns>A cookie that can be used to remove this graph from the ROT.</returns>
        private static RunningObjectTableCookie AddGraphToRot(IGraphBuilder graph)
        {
            if (graph == null) throw new ArgumentNullException("graph");
            IRunningObjectTable rot = null;
            IMoniker moniker = null;
            try
            {
                // Get the ROT.
                rot = GetRunningObjectTable(0);

                // Create a moniker for the grpah
                int pid;
                using (Process p = Process.GetCurrentProcess())
                {
                    pid = p.Id;
                }
                IntPtr unkPtr = Marshal.GetIUnknownForObject(graph);
                string item = string.Format("FilterGraph {0} pid {1}", ((int)unkPtr).ToString("x8"), pid.ToString("x8"));
                Marshal.Release(unkPtr);
                moniker = CreateItemMoniker("!", item);

                // Registers the graph in the running object table
                int cookieValue = rot.Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, graph, moniker);
                return new RunningObjectTableCookie(cookieValue);
            }
            finally
            {
                // Releases the COM objects
                if (moniker != null) while (Marshal.ReleaseComObject(moniker) > 0) ;
                if (rot != null) while (Marshal.ReleaseComObject(rot) > 0) ;
            }
        }

        public static int ConnectFilter(IGraphBuilder graph, IBaseFilter up, IBaseFilter down)
        {
            IPin pinSrc  = null;
            int i = 0;
            while ( (pinSrc = DsFindPin.ByDirection(up, PinDirection.Output, i++) ) != null )
            {
                IPin pinDest = null;
                int j = 0;
                while((pinDest = DsFindPin.ByDirection(down, PinDirection.Input, j++)) != null)
                {
                    try
                    {
                        ConnectFilters(graph, pinSrc, pinDest, true);
                    }
                    catch(Exception e)
                    {
                        Marshal.FinalReleaseComObject(pinDest);
                        continue;
                    }
                    //�ɹ�
                    Marshal.FinalReleaseComObject(pinSrc);
                    Marshal.FinalReleaseComObject(pinDest);
                    return 0;
                }
                Marshal.FinalReleaseComObject(pinSrc);
            }

            return -1;
        }

 public override void Build(IGraphBuilder builder)
 {
     foreach(var v in this)
       {
     v.Build(builder); //thats it :)
       }
       //get the last item
 }

 private void attachInstances(PluginFamily family, XmlElement familyElement, IGraphBuilder builder)
 {
     familyElement.ForEachChild(INSTANCE_NODE).Do(element =>
     {
         InstanceMemento memento = _mementoCreator.CreateMemento(element);
         family.AddInstance(memento);
     });
 }

 public override void Build(IGraphBuilder builder)
 {
     //we already gave the proper links so just act as a forwarder
     Condition.Build(builder);
     OnTrue.Build(builder);
     OnFalse.Build(builder);
     //OnTrue and OnFalse
 }

		/// <summary>
		/// Divides the supplied graph to its connected subgraphs.
		/// </summary>
		public static IGraph[] Split(IGraph initial, IGraphBuilder builder)
		{
			// A list with the nodes awaiting to be processed
			NodeCollection nodes = initial.Nodes.Clone() as NodeCollection;

			// A list with the subgraphs
			IGraph subgraph = null;
			ArrayList subgraphs = new ArrayList();

			while (nodes.Count > 0)
			{
				INode node = nodes[0];
				nodes.RemoveAt(0);

				subgraph = builder.Create();
				subgraph.Nodes.Add(node);

				int i = 0;
				while (i < subgraph.Nodes.Count)
				{
					node = subgraph.Nodes[i];

					foreach (ILink link in node.InLinks)
					{
						if (!subgraph.Nodes.Contains(link.Origin))
						{
							subgraph.Nodes.Add(link.Origin);
							nodes.Remove(link.Origin);
						}

						if (!subgraph.Links.Contains(link))
							subgraph.Links.Add(link);
					}

					foreach (ILink link in node.OutLinks)
					{
						if (!subgraph.Nodes.Contains(link.Destination))
						{
							subgraph.Nodes.Add(link.Destination);
							nodes.Remove(link.Destination);
						}

						if (!subgraph.Links.Contains(link))
							subgraph.Links.Add(link);
					}

					i++;
				}

				subgraphs.Add(subgraph);
			}

			IGraph[] result = new IGraph[subgraphs.Count];
			for (int i = 0; i < subgraphs.Count; i++)
				result[i] = subgraphs[i] as IGraph;

			return result;
		}