C++ IGraphBuilder类代码示例

/*
 * Class:     sage_DShowMediaPlayer
 * Method:    setGraphVolume0
 * Signature: (JF)F
 */
JNIEXPORT jfloat JNICALL Java_sage_DShowMediaPlayer_setGraphVolume0
  (JNIEnv *env, jobject jo, jlong dataPtr, jfloat vol)
{
	if (!dataPtr) return 0;
	CPlayerData* playData = (CPlayerData*) dataPtr;
	IGraphBuilder* pGraph = playData->GetGraph();
	vol = MAX(0, MIN(1.0f, vol));
	if (pGraph)
	{
		IBasicAudio *pAudio = NULL;
		HRESULT hr = pGraph->QueryInterface(IID_IBasicAudio, (void**)&pAudio);
		if (SUCCEEDED(hr))
		{
			long theVolume;
			if (vol == 0)
				theVolume = -10000;
			else
			{
				theVolume = (long)(10000*log((vol*2999.0) + 1)/log(3000.0)) - 10000;
			}
			hr = pAudio->put_Volume(theVolume);
			SAFE_RELEASE(pAudio);
		}
	}
	return vol;
}

void playNormalVideo()
{
	IGraphBuilder *pGraphBuilder;
	IMediaControl *pMediaControl;
	IMediaEvent *pMediaEvent;
	long eventCode;

	CoInitialize(NULL);

	CoCreateInstance(CLSID_FilterGraph,
		NULL,
		CLSCTX_INPROC,
		IID_IGraphBuilder,
		(LPVOID *)&pGraphBuilder);

	pGraphBuilder->QueryInterface(IID_IMediaControl,
		(LPVOID *)&pMediaControl);

	pGraphBuilder->QueryInterface(IID_IMediaEvent,
		(LPVOID *)&pMediaEvent);

	pMediaControl->RenderFile(L"Rscreen_shortFinger.avi");

	pMediaControl->Run();

	FILTER_STATE fs;
	HRESULT hr = pMediaControl->GetState(100, (OAFilterState*)&fs);

	// The first argument is timeout value.
	// If you change the "-1" part into "2",
	// WaitForCompletion will timeout after 2 seconds.
	pMediaEvent->WaitForCompletion(-1, &eventCode);
	switch (eventCode) {
	 case 0:
		 printf("timeout\n");
		 break;
	 case EC_COMPLETE:
		 printf("complete\n");
		 break;
	 case EC_ERRORABORT:
		 printf("errorabort\n");
		 break;
	 case EC_USERABORT:
		 printf("userabort\n");
		 break;
	}

	hr = pMediaControl->GetState(100, (OAFilterState*)&fs);
	pMediaControl->Run();
	hr = pMediaControl->GetState(100, (OAFilterState*)&fs);
	pMediaEvent->WaitForCompletion(-1, &eventCode);

	pMediaControl->Release();
	pGraphBuilder->Release();
	CoUninitialize();
}

/*
 * Class:     sage_DShowMediaPlayer
 * Method:    setNotificationWindow0
 * Signature: (JJ)V
 */
JNIEXPORT void JNICALL Java_sage_DShowMediaPlayer_setNotificationWindow0
  (JNIEnv *env, jobject jo, jlong dataPtr, jlong notifyHwnd)
{
	if (!dataPtr) return;
	CPlayerData* playerData = (CPlayerData*) dataPtr;
	IGraphBuilder* pGraph = playerData->GetGraph();
	if (!pGraph) return;
	IMediaEventEx *pME = NULL;
	pGraph->QueryInterface(IID_IMediaEventEx, (void**)&pME);
	HRESULT hr = pME->SetNotifyWindow((OAHWND)notifyHwnd, WM_DVD_EVENT, 0);
	HTESTPRINT(hr);
	SAFE_RELEASE(pME);
}

CHogVideo::CHogVideo()
{
    m_bCOMInitialized   = false;
    m_pGraph            = NULL;
    m_pMediaControl     = NULL;
    m_pEvent            = NULL;
    m_pVideoWindow      = NULL;

    HRESULT hr = NULL;

    // Initialise COM.
    hr = CoInitialize(NULL);
    if (FAILED(hr))
    {
        Cleanup();
        return;
    }
    else
        m_bCOMInitialized = true;

    // Create the filter graph manager and query for interfaces.
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
                            IID_IGraphBuilder, (void **)&m_pGraph);
    if (FAILED(hr))
    {
        Cleanup();
        return;
    }

    IGraphBuilder *pGraph = (IGraphBuilder*)m_pGraph;
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&m_pMediaControl);
    if (FAILED(hr))
    {
        Cleanup();
        return;
    }

    hr = pGraph->QueryInterface(IID_IVideoWindow, (void**)&m_pVideoWindow);
    if (FAILED(hr))
    {
        Cleanup();
        return;
    }

    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&m_pEvent);
    if (FAILED(hr))
    {
        Cleanup();
        return;
    }
}

/*
 * Class:     sage_DShowMediaPlayer
 * Method:    setVideoHWND0
 * Signature: (JJ)V
 */
JNIEXPORT void JNICALL Java_sage_DShowMediaPlayer_setVideoHWND0
  (JNIEnv *env, jobject jo, jlong dataPtr, jlong vhwnd)
{
	CPlayerData* playData = (CPlayerData*) dataPtr;
	IGraphBuilder* pGraph = playData->GetGraph();
	IVideoWindow* pVW = NULL;
	HRESULT hr = pGraph->QueryInterface(IID_IVideoWindow, (void**)&pVW);
	if (SUCCEEDED(hr))
	{
		slog((env, "DShowPlayer setVideoHWND(%d)\r\n", (int) vhwnd));
		pVW->put_AutoShow(OAFALSE);
		pVW->put_Owner((OAHWND)vhwnd);
		pVW->put_MessageDrain((OAHWND)vhwnd);
		pVW->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS | WS_CLIPCHILDREN);
		pVW->put_Visible(OATRUE);

		// We do all of our own aspect ratio control, so don't let DShow do any for us
		// by setting the aspect ratio mode on the video rendering filter's pin
		IEnumFilters *pEnum = NULL;
		hr = pGraph->EnumFilters(&pEnum);
		if (SUCCEEDED(hr))
		{
			IBaseFilter *currFilt = NULL;
			while (pEnum->Next(1, &currFilt, NULL) == S_OK)
			{
				IPin *overlayPin = NULL;
				hr = currFilt->FindPin(L"Input0", &overlayPin);
				if (SUCCEEDED(hr))
				{
					// Right pin name, let's see if it's overlay
					IMixerPinConfig *pOverlayMix = NULL;
					hr = overlayPin->QueryInterface(IID_IMixerPinConfig, (void**)&pOverlayMix);
					if (SUCCEEDED(hr))
					{
						pOverlayMix->SetAspectRatioMode(AM_ARMODE_STRETCHED);
						SAFE_RELEASE(pOverlayMix);
					}
					SAFE_RELEASE(overlayPin);
				}
				SAFE_RELEASE(currFilt);
			}
			SAFE_RELEASE(pEnum);
			hr = S_OK;
		}
		SAFE_RELEASE(pVW);
	}
	HTESTPRINT(hr);
}

HRESULT VideoTexture::InitCaptureGraphBuilder(
  IGraphBuilder **ppGraph,  // Receives the pointer.
  ICaptureGraphBuilder2 **ppBuild  // Receives the pointer.
)
{
    if (!ppGraph || !ppBuild)
    {
        return E_POINTER;
    }
    IGraphBuilder *pGraph = NULL;
    ICaptureGraphBuilder2 *pBuild = NULL;

    // Create the Capture Graph Builder.
    HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, 
        CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild );
    if (SUCCEEDED(hr))
    {
        // Create the Filter Graph Manager.
        hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER,
            IID_IGraphBuilder, (void**)&pGraph);
        if (SUCCEEDED(hr))
        {
            // Initialize the Capture Graph Builder.
            pBuild->SetFiltergraph(pGraph);

            // Return both interface pointers to the caller.
            *ppBuild = pBuild;
            *ppGraph = pGraph; // The caller must release both interfaces.

			// media control and so on
			hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
			if (FAILED(hr)) return hr;
			hr = pGraph->QueryInterface (IID_IMediaEvent, (void **)&pMediaEvent);
			if (FAILED(hr)) return hr;

            return S_OK;
        }
        else
        {
            pBuild->Release();
        }
    }
    return hr; // Failed
}

video::video(std::wstring path): texture(1,1,false,GL_LINEAR,GL_REPEAT), rendered(false), isPlaying(false) {
	printf("Opening video \"%ls\"\n", path.c_str());
	IGraphBuilder * graph;
	IBaseFilter * base;
	__int64 clipLength;

	CoInitialize(0);
	CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC, IID_IGraphBuilder, (void**)&graph);
	
	HRESULT hr = S_OK;

	graph->QueryInterface(IID_IMediaControl, (void**)&mediaControl);
	graph->QueryInterface(IID_IMediaSeeking, (void**)&mediaSeeking);
	
	grabber = new textureGrabber(0, &hr);
	grabber->AddRef();
	grabber->QueryInterface(IID_IBaseFilter, (void**)&base);
	graph->AddFilter(base, L"peisikVideoSystem OpenGL texture renderer");

	hr = graph->RenderFile(path.c_str(), 0);

	grabber->setTexture(&texture);
	graph->Release();
	base->Release();

	if(SUCCEEDED(hr) && grabber->width)
	{
		printf("Video succesfully rendered\n");
		mediaSeeking->SetTimeFormat(&TIME_FORMAT_MEDIA_TIME);
		mediaSeeking->GetDuration(&clipLength);
		length = (long double)(clipLength)/(long double)10000000.0;

		__int64 position = 0;
		mediaSeeking->SetPositions(&position, AM_SEEKING_AbsolutePositioning, &position, AM_SEEKING_NoPositioning);

		rendered = true;
	}
	else
		printf("Couldn't find a working video graph\n");
}

bool CHogVideo::Hog()
{
    if (!m_pGraph && !m_pMediaControl && !m_pVideoWindow)
        return false;

    this->UnHog();

    HRESULT hr = NULL;
    IGraphBuilder *pGraph           = (IGraphBuilder*)  m_pGraph;
    IMediaControl *pMediaControl    = (IMediaControl*)  m_pMediaControl;
    IVideoWindow  *pVideoWindow     = (IVideoWindow*)   m_pVideoWindow;

    // Build the graph. IMPORTANT: Change string to a file on your system.
    hr = pGraph->RenderFile(m_wszFilename, NULL);
    if (SUCCEEDED(hr))
    {
        // Run the graph.
        hr = pMediaControl->Run();
        // Hide the window
        pVideoWindow->put_WindowState(SW_HIDE);
        pVideoWindow->put_AutoShow(OAFALSE);
        pVideoWindow->put_Visible(OAFALSE);
        pVideoWindow->put_Top(-100);
        pVideoWindow->put_Left(-100);
        pVideoWindow->put_Width(0);
        pVideoWindow->put_Height(0);

        if (SUCCEEDED(hr))
        {
            // Hog the resource.
            pMediaControl->Pause();
            return true;
        }
        else
            return false;
    }
    else
        return false;
}

void main()
{
	int option;
    IGraphBuilder *pGraph = NULL;  //Creem l'apuntador al graf de filtres
	IMediaControl *pControl = NULL; //creem l'apuntador a un controlador per ayurar i iniciar el graf 
	IMediaEvent *pEvent = NULL; // apunta a l'objecte necessari per obtenir events del filter graph manager
	//IBaseFilter *pGrabberF = NULL;
    //ISampleGrabber *pGrabber = NULL;

	HRESULT hr = CoInitialize(NULL); // Inicialitzem la llibreria COM
	if ( FAILED(hr) ){
		printf("ERROR - Could not initialize COM library");
        return;
	}
	// Create the filter graph manager and query for interfaces.
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr))
    {
        printf("ERROR - Could not create the Filter Graph Manager.");
        return;
    }
	
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);

    // Build the graph. IMPORTANT: Change this string to a file on your system.
	cout<<"introduce 1:chicken 2:futbol 3: video futbol audio chicken: \n";
	cin>>option;
	switch(option)
	{
		case 1: hr = pGraph->RenderFile(L"C:\\Users\\Victor\\Downloads\\chicken.wmv", NULL);
			
			break;
		case 2: hr = pGraph->RenderFile(L"C:\\Users\\Victor\\Downloads\\futbol.mpg", NULL);
			break;
		case 3:  // Create the Sample Grabber filter.
  			break;
	}

    if (SUCCEEDED(hr))
    {
        // Run the graph.
        hr = pControl->Run();
        if (SUCCEEDED(hr))
        {
            // Wait for completion.
            long evCode;
            pEvent->WaitForCompletion(INFINITE, &evCode);

            // Note: Do not use INFINITE in a real application, because it
            // can block indefinitely.
        }
    }
    pControl->Release();
    pEvent->Release();
    pGraph->Release();
    CoUninitialize();

}

void CHogVideo::Cleanup()
{
    this->UnHog();

    if (m_pEvent)
    {
        IMediaEvent *pEvent = (IMediaEvent*)m_pEvent;
        pEvent->Release();
        m_pEvent = NULL;
    }

    if (m_pVideoWindow)
    {
        IVideoWindow *pVideoWindow = (IVideoWindow*)m_pVideoWindow;
        pVideoWindow->Release();
        m_pVideoWindow = NULL;
    }

    if (m_pMediaControl)
    {
        IMediaControl *pMediaControl = (IMediaControl*)m_pMediaControl;
        pMediaControl->Release();
        m_pMediaControl = NULL;
    }

    if (m_pGraph)
    {
        IGraphBuilder *pGraph = (IGraphBuilder*)m_pGraph;
        pGraph->Release();
        m_pGraph = NULL;
    }

    if (m_bCOMInitialized)
    {
        CoUninitialize();
        m_bCOMInitialized = false;
    }
}

Camera::Camera(bool Show,bool Start) : eHandler(this),_realData(false),_UpdateWindow(Show),_LastData(0),_CurData(0) {
	DWORD no;
	IGraphBuilder *graph = 0;
	ctrl = 0;
	ICreateDevEnum *devs = 0;
	IEnumMoniker *cams = 0;
	IMoniker *mon = 0;
	IBaseFilter *cam = 0;
	IEnumPins *pins = 0;
	IPin *pin = 0;
	IEnumFilters *fil = 0;
	IBaseFilter *rnd = 0;
	IMemInputPin *mem = 0;
	curCamera = this;
	_isOn = Start;

	CoCreateInstance( CLSID_FilterGraph, 0, CLSCTX_INPROC,IID_IGraphBuilder, (void **)&graph );
	graph->QueryInterface( IID_IMediaControl, (void **)&ctrl );
	CoCreateInstance (CLSID_SystemDeviceEnum, 0, CLSCTX_INPROC, IID_ICreateDevEnum, (void **) &devs);
	devs->CreateClassEnumerator (CLSID_VideoInputDeviceCategory, &cams, 0);
	cams->Next (1,&mon,0);												// get first found capture device (webcam)    
	mon->BindToObject(0,0,IID_IBaseFilter, (void**)&cam);
	
	graph->AddFilter(cam, L"Capture Source");							// add web cam to graph as source
	cam->EnumPins(&pins);												// we need output pin to autogenerate rest of the graph
	pins->Next(1,&pin, 0);												// via graph->Render
	graph->Render(pin);													// graph builder now builds whole filter chain including MJPG decompression on some webcams
	graph->EnumFilters(&fil);											// from all newly added filters
	fil->Next(1,&rnd,0);												// we find last one (renderer)
	rnd->EnumPins(&pins);												// because data we are intersted in are pumped to renderers input pin 
	pins->Next(1,&pin, 0);												// via Receive member of IMemInputPin interface
	pin->QueryInterface(IID_IMemInputPin,(void**)&mem);

	DsHook(mem,6,Receive);												// so we redirect it to our own proc to grab image data

	if (Start) this->Start();
}

void play_movie( HWND hwnd )
{
    IGraphBuilder *pGraph;
    IMediaControl *pMediaControl;
    IMediaEvent   *pEvent;
    IBasicVideo   *pBasic;
    IVideoWindow    *pVidWin = NULL;
    RECT grc;
    long width, height;

    CoInitialize(NULL);
    
    // Create the filter graph manager and query for interfaces.
    CoCreateInstance( 
	CLSID_FilterGraph, 
	NULL, 
	CLSCTX_INPROC_SERVER, 
	IID_IGraphBuilder, 
	(void **)&pGraph);
    
    pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVidWin);

    pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
    pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    pGraph->QueryInterface(IID_IBasicVideo, (void**)&pBasic );

    // Build the graph. IMPORTANT: Change string to a file on your system.
    pGraph->RenderFile(L"e:\\alpha\\running.avi", NULL);

    pBasic->GetVideoSize( &width, &height );  
    printf( "video frames are %d x %d\n", width, height );

    pVidWin->put_Owner((OAHWND)hwnd);
    pVidWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);

    GetClientRect( hwnd, &grc );
    pVidWin->SetWindowPosition(10, 10, width, height);
    printf( "window is %d x %d\n", grc.right, grc.bottom );

    // Run the graph.
    pMediaControl->Run();

    // Wait for completion. 
    long evCode;
    pEvent->WaitForCompletion(INFINITE, &evCode);

    pVidWin->put_Visible(OAFALSE);
    pVidWin->put_Owner(NULL);
    
    // Clean up.
    pBasic->Release();
    pVidWin->Release();
    pMediaControl->Release();
    pEvent->Release();
    pGraph->Release();
    CoUninitialize();
}

int video_add(string fname) {
	enigma::VideoStruct* videoStruct = new enigma::VideoStruct();
    IGraphBuilder *pGraph = NULL;

    // Initialize the COM library.
    HRESULT hr = CoInitialize(NULL);
    if (FAILED(hr))
    {
	   MessageBox(NULL, "Failed to initialize COM library.", "ERROR", MB_ICONERROR | MB_OK);
        return -1;
    }

    // Create the filter graph manager and query for interfaces.
    hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 
                        IID_IGraphBuilder, (void **)&pGraph);
    if (FAILED(hr))
    {
		MessageBox(NULL, "Failed to create the Filter Graph Manager.", "ERROR", MB_ICONERROR | MB_OK);
        return -1;
    }
	
	
	// Build the graph.
    hr = pGraph->RenderFile(std::wstring(fname.begin(), fname.end()).c_str(), NULL);
	
	IVideoWindow *pVidWin = NULL;
	pGraph->QueryInterface(IID_IVideoWindow, (void **)&pVidWin);
	
	pVidWin->put_Owner((OAHWND)enigma::hWnd);
	
	pVidWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);
	
	videoStruct->pGraph = pGraph;
	enigma::videoStructs.push_back(videoStruct);
	return enigma::videoStructs.size() - 1;
}

void Video::PlayMovie(string path)
{
	IGraphBuilder *pGraph = NULL;
    IMediaControl *pControl = NULL;
    IMediaEvent   *pEvent = NULL;
	IVideoWindow  *pVideo = NULL;
	
    // Initialize the COM library.
    CoInitialize(NULL);

    // Create the filter graph manager and query for interfaces.
    CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);

	// Build the graph
	int len;
	int slength = (int)path.length() + 1;
	len = MultiByteToWideChar(CP_ACP, 0, path.c_str(), slength, 0, 0);
	 wchar_t* buf = new wchar_t[len];
	MultiByteToWideChar(CP_ACP, 0, path.c_str(), slength, buf, len);
	 std::wstring r(buf);
	delete[] buf;

	pGraph->RenderFile(LPCWSTR(r.c_str()), NULL);

	// set the owner window
	pGraph->QueryInterface(IID_IVideoWindow, (void **) &pVideo);	
	pVideo->put_Owner((OAHWND)window);
	pVideo->put_WindowStyle( WS_CHILD );
	pVideo->put_Left(0);
	pVideo->put_Top(0);
	

    pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);

	pControl->Run();
	long evCode;
	pEvent->WaitForCompletion(-1, &evCode);
	
	// release controls
    pControl->Release();
    pEvent->Release();
    pGraph->Release();
	pVideo->Release();
    CoUninitialize();
}

/*
 * Class:     sage_DShowMediaPlayer
 * Method:    getColorKey0
 * Signature: (J)Ljava/awt/Color;
 */
JNIEXPORT jobject JNICALL Java_sage_DShowMediaPlayer_getColorKey0
  (JNIEnv *env, jobject jo, jlong dataPtr)
{
	if (!dataPtr) return 0;
	CPlayerData* playData = (CPlayerData*) dataPtr;
	IGraphBuilder* pGraph = playData->GetGraph();
	if (!pGraph) return 0;
	BOOL forceColorKey = FALSE;
	HRESULT hr;
	DWORD holder;
	HKEY myKey;
	DWORD readType;
	DWORD hsize = sizeof(holder);
	DWORD keyedColor = RGB(1,1,1);
	if (RegCreateKeyEx(HKEY_LOCAL_MACHINE, "SOFTWARE\\Frey Technologies\\Common\\DirectShow", 0, 0,
		REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, 0, &myKey, 0) == ERROR_SUCCESS)
	{
		if (RegQueryValueEx(myKey, "TransparentColorKey", 0, &readType, (LPBYTE) &holder, &hsize) == ERROR_SUCCESS)
		{
			keyedColor = holder;
			forceColorKey = TRUE;
		}
		RegCloseKey(myKey);
	}
	COLORKEY overlayKey;
	overlayKey.KeyType = CK_RGB;
	overlayKey.PaletteIndex = 0;
	overlayKey.LowColorValue = keyedColor;
	overlayKey.HighColorValue = keyedColor;

	COLORKEY defaultKey;

	BOOL overlayIsUsed = FALSE;
	IEnumFilters *pEnum = NULL;
	if (!forceColorKey)
	{
		// Find the default color key
		hr = pGraph->EnumFilters(&pEnum);
		if (SUCCEEDED(hr))
		{
			IBaseFilter *currFilt = NULL;
			while (pEnum->Next(1, &currFilt, NULL) == S_OK)
			{
				IPin *overlayPin = NULL;
				IEnumPins* pPinEnum = NULL;
				hr = currFilt->EnumPins(&pPinEnum);
				if (hr == NO_ERROR)
				{
					IPin *pPin = NULL;
					hr = E_FAIL;
					while(S_OK == pPinEnum->Next(1, &pPin, NULL))
					{
						IOverlay *pOverlayPin = NULL;
						hr = pPin->QueryInterface(IID_IOverlay, (void**)&pOverlayPin);
						if (SUCCEEDED(hr))
						{
							hr = pOverlayPin->GetDefaultColorKey(&defaultKey);
							if (!forceColorKey && SUCCEEDED(hr))
							{
								keyedColor = defaultKey.LowColorValue;
								slog((env, "Got the default color key 0x%x\r\n", keyedColor));
								//forceColorKey = TRUE;
							}
							SAFE_RELEASE(pOverlayPin);
						}
						SAFE_RELEASE(pPin);
					}
					SAFE_RELEASE(pPinEnum);
				}
				SAFE_RELEASE(currFilt);
			}
			SAFE_RELEASE(pEnum);
		}
	}
	pEnum = NULL;

	// Set the color key value
	hr = pGraph->EnumFilters(&pEnum);
	if (SUCCEEDED(hr))
	{
		IBaseFilter *currFilt = NULL;
		while (pEnum->Next(1, &currFilt, NULL) == S_OK)
		{
			IPin *overlayPin = NULL;
			IEnumPins* pPinEnum = NULL;
			currFilt->EnumPins(&pPinEnum);
			while (pPinEnum->Next(1, &overlayPin, NULL) == S_OK)
			{
				// let's see if it's overlay
				IMixerPinConfig *pOverlayMix = NULL;
				hr = overlayPin->QueryInterface(IID_IMixerPinConfig, (void**)&pOverlayMix);
				if (SUCCEEDED(hr))
				{
					if (!forceColorKey)
						keyedColor = overlayKey.LowColorValue;
//.........这里部分代码省略.........