DirectShow播放器（LAVFilter + EVR）开发例子

LAVFilter是一套著名的DirectShow插件，包括Demux，Video Decoder，AudioDecoder，播放文件所需要的几个重要插件都包含进去了，并且支持播放的视音频格式非常广泛，FFmpeg支持的它几乎都支持（因为它底层是调用FFmpeg）。LAVFilter是我们开发Directshow播放器必不可少的插件，值的一提的是它既支持软解又支持硬解，功能非常强大。在Vista以上系统硬解的时候渲染器必须要用EVR，很多关于directshow播放器的例子都是解码器连接VMR进行播放的，连接EVR的很少介绍，这篇文章就给大家讲一下怎么用LAV + EVR来播放视频。

假如我们要播放一个视频文件，那么用Directshow需要构建一个Filter链路图，以下就是播放一个文件的链路图例子：

上图连接的渲染器是Video Renderer（VMR），但是如果要切换到硬解模式，则连接的渲染器要改成EVR（enhanced video renderer）。

我写了一个类，封装了构建和运行DirectShow FilterGraph的一些流程，下面是类的声明：


// CHDVideoPlayGraphclass CHDVideoPlayGraph : public CWnd
{DECLARE_DYNAMIC(CHDVideoPlayGraph)public:CHDVideoPlayGraph();virtual ~CHDVideoPlayGraph();void SetNum(int num) { m_Num = num; }HRESULT   BuildGraph(LPCTSTR lpszSrcFile);void      StopCapture();BOOL      GetVideoSize(CSize & size);PLAYSTATE GetState() { return m_psCurrent; }BOOL      GetVideoStatis(DWORD & dwBitrate, UINT & dwFps);void      UnIntializeVideo();HRESULT   InitializeVideo(HWND hWnd);HRESULT  SetupVideoWindow(HWND hVideoWnd);void      ResizeVideoWindow();DWORD     GetCurrentBitrate(); void      SetVideoMediatype(AM_MEDIA_TYPE * pMt);void      SetAudioMediatype(AM_MEDIA_TYPE * pmt);void      SetCaptureCallback(VideoCaptureCB captureCB) { m_CaptureCB = captureCB; }void      CheckRgb24Buffer();void      OnRecvVideo(int nNum,PBYTE pBuffer,long BufferLen); //被回调函数调用BOOL      HasAudioStream() { return m_bHasAudio; }void      SetAudioStream(BOOL bEnable) { m_bHasAudio = bEnable; }//void      SetVideoRecvPort(int port);LRESULT   OnRestartPlaying(WPARAM wParam, LPARAM lParam);void      SetHarewareDecode(BOOL bFlag);void      SetVMRMode(int nVMR);int       GetFrameRate();
protected:DECLARE_MESSAGE_MAP()afx_msg HRESULT OnGraphNotify(WPARAM wp, LPARAM lp);afx_msg void OnPaint();void      DisplayMesg(TCHAR* szFormat, ...);LRESULT   ClearInterfaces(WPARAM wp, LPARAM lp);void      CloseInterfaces();HRESULT   AddGraphToRot(IUnknown* pUnkGraph, DWORD* pdwRegister);void      RemoveGraphFromRot(DWORD pdwRegister);HRESULT   HandleGraphEvent();HRESULT   GetInterfaces();HRESULT   SetSyncClock();void      GetSyncClock();HRESULT  RenderFilter(IBaseFilter * pFilter);private:UINT chFullScreen, chAlwaysOnTop;UINT            m_Num;CBrush          m_emptyBrush;DWORD           m_dwGraphRegister;HWND            m_hApp;IVideoWindow*   m_pVW; IMediaControl*  m_pMC;IMediaEventEx*  m_pME;IGraphBuilder*  m_pGraph;ICaptureGraphBuilder2 *m_pCapture;VideoCaptureCB   m_CaptureCB;IBaseFilter   * m_pRenderer;IBaseFilter   * m_pNullFilter;IBaseFilter    * m_pVideoDec;IBaseFilter    * m_pAudioDec;PLAYSTATE          m_psCurrent; BOOL               m_bHasAudio;AM_MEDIA_TYPE      m_AudioMediaType;AM_MEDIA_TYPE      m_VideoMediaType;ULONG              m_nWidth, m_nHeight;PBYTE              m_pRgb24;TCHAR              m_szFile[256];BOOL               m_bHarewareDecode; //1--硬解码, 0--软解码INT                m_nVMRRenderer; ///1--VMR7, 2--VMR9，3--EVRDWORD              m_dwStartTick;
};

我们首先要在代码中定义要引用到的几个Filter的CLSID，包括LAV和EVR的：

DEFINE_GUID(CLSID_EnhancedVideoRenderer,0xFA10746C, 0x9B63, 0x4B6C, 0xBC, 0x49, 0xFC, 0x30, 0x0E, 0xA5, 0xF2, 0x56);DEFINE_GUID(CLSID_LAVSplitter,0x171252A0, 0x8820, 0x4AFE, 0x9D, 0xF8, 0x5C, 0x92, 0xB2, 0xD6, 0x6B, 0x04);DEFINE_GUID(CLSID_LAVSource, 0xB98D13E7, 0x55DB, 0x4385, 0xA3, 0x3D, 0x09, 0xFD, 0x1B, 0xA2, 0x63, 0x38);DEFINE_GUID(CLSID_LAVVideoDec,0xEE30215D, 0x164F, 0x4A92, 0xA4, 0xEB, 0x9D, 0x4C, 0x13, 0x39, 0x0F, 0x9F);DEFINE_GUID(CLSID_LAVAudioDec,0xE8E73B6B, 0x4CB3, 0x44A4, 0xBE, 0x99, 0x4F, 0x7B, 0xCB, 0x96, 0xE4, 0x91);

为了支持软解和硬解，并且能连接不同的渲染器Renderer，我在类声明里定义了两个变量：一个是解码模式，另外一个是连接的渲染器类型。方便对不同的模式进行切换。

    BOOL               m_bHarewareDecode; //1--硬解码, 0--软解码INT                m_nVMRRenderer; 0--GDI, 1--VMR7, 2--VMR9

接着，我们看一下怎么构建DirectShow链接图：


HRESULT CHDVideoPlayGraph::BuildGraph(LPCTSTR lpszSrcFile)
{HRESULT hr;USES_CONVERSION;CFileFind find;if(find.FindFile(lpszSrcFile) == FALSE){AfxMessageBox("Can not Find File");return E_FAIL;}_tcscpy(m_szFile, lpszSrcFile);// Get DirectShow interfaceshr = GetInterfaces();if (FAILED(hr)){DisplayMesg(TEXT("Failed to get video interfaces!  hr=0x%x"), hr);return hr;}BOOL bIsWin7 = FALSE;TCHAR sRC[64] = {0};OSVERSIONINFO versionInfo;versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);if(::GetVersionEx(&versionInfo)){switch(versionInfo.dwPlatformId){case VER_PLATFORM_WIN32_WINDOWS:if(versionInfo.dwMinorVersion >= 0 && versionInfo.dwMinorVersion <= 9 ){_tcscpy( sRC, _T("95"));}else if(versionInfo.dwMinorVersion >= 10 && versionInfo.dwMinorVersion <= 89 ){_tcscpy(sRC, _T("98"));}else if(versionInfo.dwMinorVersion == 90 ){_tcscpy(sRC, _T("Me"));}break;case VER_PLATFORM_WIN32_NT:if(versionInfo.dwMajorVersion == 4){}else if(versionInfo.dwMajorVersion == 5){switch(versionInfo.dwMinorVersion){case 0:_tcscpy(sRC, _T("2000"));break;case 1:_tcscpy(sRC, _T("XP"));break;case 2:_tcscpy(sRC, _T("2003"));break;}//switch}// else if(versionInfo.dwMajorVersion == 5)else {_tcscpy(sRC, _T("Windows7"));bIsWin7 = TRUE;}break;default:break;}  //switch}else{OutputDebugString("GetVersionEx Errro!\n");}char szSysInfo[100] = {0};sprintf(szSysInfo, "OSType is: %s \n", sRC);OutputDebugString(szSysInfo);CComPtr<IBaseFilter> pSrcBaseFilter;hr = ::AddFilterByCLSID(m_pGraph, CLSID_LAVSource, L"LAVSource Filter", &pSrcBaseFilter);if (FAILED(hr)){MessageBox("Add LAVSource Filter  Failed", "Error");return hr;}IFileSourceFilter * pFileSource = NULL;hr = pSrcBaseFilter->QueryInterface(IID_IFileSourceFilter, (void**)&pFileSource);if(pFileSource){hr = pFileSource->Load(A2W(m_szFile), NULL);pFileSource->Release();}if(FAILED(hr)){MessageBox("Load File Failed", "Error");return hr;}//Add Video Decode filterhr = ::AddFilterByCLSID(m_pGraph, CLSID_LAVVideoDec, L"LAVVideo  Decoder", &m_pVideoDec);if (FAILED(hr)){return hr;   }ILAVVideoSettings  * pLAVSetting = NULL;hr = m_pVideoDec->QueryInterface(__uuidof(ILAVVideoSettings), (void**)&pLAVSetting);if(SUCCEEDED(hr)){pLAVSetting->SetHWAccel(m_bHarewareDecode ? HWAccel_DXVA2Native : HWAccel_None);TRACE("SetHWAccel HW: %d \n", m_bHarewareDecode);pLAVSetting->Release();}if(bIsWin7){CComPtr<IMFVideoDisplayControl> m_spDisplayCtrl;  CComPtr<IMFGetService> pGetService;  //Add Enhanced Video Renderer hr = ::AddFilterByCLSID(m_pGraph,  CLSID_EnhancedVideoRenderer,  L"Enhanced Video Renderer ", &m_pRenderer);if(FAILED(hr)){return hr;}hr = m_pRenderer->QueryInterface((__uuidof(IMFGetService)),(VOID ** )&pGetService);  if(FAILED(hr)){return hr;}hr = pGetService->GetService(MR_VIDEO_RENDER_SERVICE,__uuidof(IMFVideoDisplayControl), (void **)&m_spDisplayCtrl);  RECT Rect;  ::GetClientRect (m_hApp, &Rect);  m_spDisplayCtrl->SetVideoWindow (m_hApp);  m_spDisplayCtrl->SetAspectRatioMode(MFVideoARMode_None);  m_spDisplayCtrl->SetVideoPosition(NULL, &Rect);  }else{//Add Video Renderer if(m_nVMRRenderer == 0){hr = ::AddFilterByCLSID(m_pGraph, CLSID_VideoRenderer, L"Video Renderer ", &m_pRenderer);if(FAILED(hr)){return hr;}}else if(m_nVMRRenderer == 1){hr = ::AddFilterByCLSID(m_pGraph, CLSID_VideoMixingRenderer, L"Video Renderer ", &m_pRenderer);if(FAILED(hr)){return hr;}}else if(m_nVMRRenderer == 2){hr = ::AddFilterByCLSID(m_pGraph, CLSID_VideoMixingRenderer9, L"Video Renderer ", &m_pRenderer);if(FAILED(hr)){return hr;}}hr = m_pGraph->QueryInterface(IID_IVideoWindow, (LPVOID *) &m_pVW);if (FAILED(hr))return hr;}hr = RenderFilter(pSrcBaseFilter);if (FAILED(hr)){OutputDebugString(_T("RenderFilter Failed. \n"));return hr;}hr = SetupVideoWindow(m_hWnd);//SetSyncClock();IPin * pRenderInputPin = NULL;pRenderInputPin = GetInPin(m_pRenderer, 0);if(pRenderInputPin == NULL)return E_FAIL;AM_MEDIA_TYPE  amType;AM_MEDIA_TYPE * pmt = &amType;hr = pRenderInputPin->ConnectionMediaType(pmt);if(SUCCEEDED(hr)){if(pmt->formattype == FORMAT_VideoInfo){VIDEOINFOHEADER * pVidHdr = (VIDEOINFOHEADER*) pmt->pbFormat;m_nWidth   = pVidHdr->bmiHeader.biWidth;m_nHeight  = pVidHdr->bmiHeader.biHeight;}else if(pmt->formattype == FORMAT_VideoInfo2){VIDEOINFOHEADER2 * pVidHdr = (VIDEOINFOHEADER2*) pmt->pbFormat;m_nWidth   = pVidHdr->bmiHeader.biWidth;m_nHeight  = pVidHdr->bmiHeader.biHeight;}else if (pmt->formattype == FORMAT_MPEGVideo){MPEG1VIDEOINFO *pVidHdr = (MPEG1VIDEOINFO *) pmt->pbFormat;m_nWidth  = pVidHdr->hdr.bmiHeader.biWidth;m_nHeight = pVidHdr->hdr.bmiHeader.biHeight;} else if (pmt->formattype  == FORMAT_MPEG2Video){MPEG2VIDEOINFO *pVidHdr = (MPEG2VIDEOINFO *) pmt->pbFormat;m_nWidth = pVidHdr->hdr.bmiHeader.biWidth;m_nHeight = pVidHdr->hdr.bmiHeader.biHeight;} else{}FreeMediaType(amType);}#ifdef REGISTER_FILTERGRAPH// Add our graph to the running object table, which will allow// the GraphEdit application to "spy" on our graphhr = AddGraphToRot(m_pGraph, &m_dwGraphRegister);if (FAILED(hr)){DisplayMesg(TEXT("Failed to register filter graph with ROT!  hr=0x%x"), hr);m_dwGraphRegister = 0;}
#endif// Start previewing video datahr = m_pMC->Run();if (FAILED(hr)){DisplayMesg(TEXT("Couldn't run the graph!  hr=0x%x"), hr);return hr;}// Remember current statem_psCurrent = RUNNING;m_dwStartTick = GetTickCount();return S_OK;
}

上面的BuildGraph函数，首先调用GetInterfaces接口获取Directshow组件的一些接口：

HRESULT CHDVideoPlayGraph::GetInterfaces()
{HRESULT hr;if(m_pGraph == NULL){// Create the filter graphhr = CoCreateInstance (CLSID_FilterGraph, NULL, CLSCTX_INPROC,IID_IGraphBuilder, (void **) &m_pGraph);if (FAILED(hr)){TRACE("CoCreateInstance() failed \n");return hr;}}elsereturn E_FAIL ;//hr = m_pGraph->QueryInterface(IID_IVideoWindow, (LPVOID *) &m_pVW); //使用VMR时需要获取该接口进行视频窗口控制，但EVR不需要获取该接口//   if (FAILED(hr))//       return hr;// Obtain interfaces for media control and Video Windowhr = m_pGraph->QueryInterface(IID_IMediaControl,(LPVOID *) &m_pMC);if (FAILED(hr))return hr;hr = m_pGraph->QueryInterface(IID_IMediaEvent, (LPVOID *) &m_pME);if (FAILED(hr))return hr;// Set the window handle used to process graph eventshr = m_pME->SetNotifyWindow((OAHWND)m_hApp, WM_GRAPHNOTIFY, 0);//m_pME->CancelDefaultHandling(EC_DISPLAY_CHANGED);return hr;
}

然后，依次把LAV Source Filter，LAV Video Decode Filter加进去。代码中会根据系统版本决定优先插入哪个Video Renderer，如果是Win7以上，则插入EVR；其他系统版本则根据m_nVMRRenderer的类型值来选择对应的Renderer（VMR7，VMR9）。

接着，调用RenderFilter自动将上面的Filter连接起来（可能还会加入其他Filter）。


HRESULT CHDVideoPlayGraph:: RenderFilter(IBaseFilter * pFilter)
{CComPtr< IEnumPins > pEnum;if (!pFilter)return E_POINTER;HRESULT hr = pFilter->EnumPins(&pEnum);if(FAILED(hr)) return hr;ULONG ulFound;IPin *pPin;hr = E_FAIL;int nOutputPinCount = 0;int nRenderedCount = 0;while(S_OK == pEnum->Next(1, &pPin, &ulFound)){PIN_DIRECTION pindir = (PIN_DIRECTION)3;pPin->QueryDirection(&pindir);if(pindir == PINDIR_OUTPUT){IPin * pPin2 = NULL;pPin->ConnectedTo(&pPin2);if(pPin2){//pPin->Disconnect(); //先断开连接pPin2->Release();pPin2 = NULL;}else{hr = m_pGraph->Render(pPin); //自动连接Output Pin的下一级链路if(SUCCEEDED(hr))nRenderedCount++;}nOutputPinCount++;} pPin->Release();} return nRenderedCount > 0 ? (nOutputPinCount == nRenderedCount ? S_OK : S_FALSE) : E_FAIL;
}

例子代码链接：https://download.csdn.net/download/zhoubotong2012/11874281

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