编写C++程序使DirectShow进行视频捕捉

HRESULT InitCaptureGraphBuilder(IGraphBuilder **ppGraph,      //Receives the pointer 
                ICaptureGraphBuilder2 **ppBuilder)           //Receives the pointer 
{ 
  if(!ppGraph || !ppBuilder) 
  { 
    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**)&pGraph); 
 
  if(SECCEEDED(hr)) 
  { 
    //Create the Filter Graph Manager 
    hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER,  
                    IID_IGraphBuilder, (void**)&pGraph); 
    if(SECCEEDED(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 interface 
      return S_OK; 
    } 
    else  
    { 
      pBuild->Release(); 
    } 
  } 
  return hr;     //Failed 
} 

ICreateDevEnum *pDevEnum = NULL; 
IEnumMoniker *pEnum = NULL; 
 
//Create the system device enumerator 
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, 
               CLSCT_INPROC_SERVER, IID_ICreateDevEnum,  
               reinterpret_cast<void**>(&pDevEnum)); 
 
if(SUCCEEDED(hr)) 
{ 
  //创建一个枚举器，枚举视频设备 
  hr = pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,  
                    &pEnum, 0); 
} 

HWND hList;     //Handle to the list box 
IMoniker *pMoniker = NULL; 
while(pEnum->Next(1, &pMoniker, NULL) == S_OK) 
{ 
  IPropertyBag *pPropBag; 
  hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void**)(&pPropBag)); 
  if(FAILED(hr)) 
  { 
    pMoniker->Release(); 
    continue;    //Skip this one, maybe the next one will work 
  } 
  VARIANT varName; 
  hr = pPropBag->Read(L"Description", &varName, 0); 
  if(FAILED(hr)) 
  { 
    hr = pPropBag->Read(L"FriendlyName", &varName, 0); 
  } 
  if(SECCEEDED(hr)) 
  { 
    //Add it to the application's list box 
    USES_CONVERSION; 
    (long)SendMessage(hList, LB_ADDSTRING, 0, (LPARAM)OLE2T(varName.bstrVal)); 
    VariantClear(&varName); 
  } 
 
  pPropBag->Release(); 
  pMoniker->Release(); 
} 

IBaseFilter *pCap = NULL; 
hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap); 
if(SECCEEDED(hr)) 
{ 
  hr = m_pGraph->AddFilter(pCap, L"Capture Filter"); 

ICaptureGraphBuilder2 *pBuild;   //Capture Graph Builder 
//Initialize pBuild(not shown) 
... 
IBaseFilter *pCap;                 //Video capture filter 
hr = pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, 
                        pCap, NULL, NULL); 
} 

IBaseFilter *pMux; 
hr = pBuild->SetOutputFileName(&MEDIASUBTYPE_Avi,      //Specifies AVI for the target file 
                L"C:\\Example.avi",       //File name 
                &pMux,                  //Receives a pointer to the mux 
                NULL);    //(Optional)Receives a pointer to the file sink 

hr = pBuild->RenderStream(&PIN_CATEGORY_CAPTURE,     //Pin category 
             &MEDIATYPE_Video,     //Media type 
             pCap,     //Capture filter 
             NULL,     //Intermediate filter(optional) 
             pMux);     //Mux or file sink filter 
//Release the mux filter 
pMux->Release(); 

IConfigAviMux *pConfigMux = NULL; 
hr = pMux->QueryInterface(IID_IConfigAviMux, (void**)&pConfigMux); 
if(SUCCEEDED(hr)) 
{ 
  pConfigMux->SetMasterStream(1); 
  pConfigMux->Release(); 
} 

IBaseFilter *pEncoder; 
//Add it to the filter graph 
pGraph->AddFilter(pEncoder, L"Encode"); 
//Render the stream 
hr = pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,  
             pCap, pEncoder, pMux); 
pEncoder->Release(); 

IBaseFilter *pASFWriter = 0; 
hr = pBuild->SetOutputFileName(&MEDIASUBTYPE_Asf,    //Create a windows media file 
                L"C:\\VidCap.wmv",        //File name 
                &pASFWriter,       //Receives a pointer to the filter 
                NULL);        //Receives an IFileSinkFilter interface pointer(optional)

IConfigAsfWriter *pConfig = 0; 
hr = pASFWriter->QueryInterface(IID_IConfigAsfWriter, (void**)&pConfig); 
if(SUCCEEDED(hr)) 
{ 
  //Configure the ASF Writer filter 
  pConfig->Release(); 
} 

hr = pBuild->RenderStream(&PIN_CATEGORY_CAPTURE,     //Capture pin 
             &MEDIATYPE_Video,       //Video. Use MEDIATYPE_Audio for audio 
             pCap,     //Pointer to the capture filter 
             0,  
             pASFWriter);   //Pointer to the sink filter(ASF Filter) 

IBaseFilter *pMux = 0; 
IFileSinkFilter *pSink = 0; 
hr = pBuild->SetOutputFileName(&CLSID_MyCustomMuxFilter,   //开发自己的Filter 
                L"C:\\VidCap.avi", &pMux, &pSink); 
 

IBaseFilter *pMux = 0; 
IFileSinkFilter *pSink = 0; 
hr = pBuild->SetOutputFileName(&MEDIASUBTYPE_Avi,  
                L"C:\\YourFileName.avi", &pMux, &pSink); 
if(SUCCEEDED(hr)) 
{ 
  hr = pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, 
                        pCap, NULL, pMux); 
  if(SUCCEEDED(hr)) 
  { 
    pControl->Run(); 
    pControl->Stop(); 
    //Change the file name and run the graph again 
    pSink->SetFileName(L"YourFileName02.avi", 0); 
    pControl->Run(); 
  } 
 
  pMux->Release(); 
  pSink->Release(); 
}