DirectShow采集到的视频无法播放

hrjhrj12345 2010-04-06 08:17:19

DirectShow采集到的视频无法播放
关键看视频开始采集的代码就OK了。



 //采集相关的变量

	IGraphBuilder *pGraph;    

	ICaptureGraphBuilder2 *pBuild; //视频采集过滤器图表

IMediaControl *m_pMediaControl;

	//视频采集设备的源Filter   

	IBaseFilter* pSrc;

//---------------------------------------------------------------------//



HRESULT hr;

	//创建IGraphBuilder

	CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void      **)&pGraph);



	//创建ICaptureGraphBuilder2

	hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, 

		CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild); 



	// 过滤器图表添加到管理器中

	pBuild->SetFiltergraph(pGraph); 

//--------------------------------------------------------------------------------//

//以下代码为查找设备

	ICreateDevEnum *pDevEnum=NULL;

	IEnumMoniker *pClsEnum=NULL;



	//创建设备枚举COM对象

	CoCreateInstance(CLSID_SystemDeviceEnum,NULL,CLSCTX_INPROC,IID_ICreateDevEnum,(void **)&pDevEnum);



	//创建视频采集设备枚举COM对象

	pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory,&pClsEnum,0);

	if(pClsEnum == NULL)

	{

		MessageBox(_T("Sorry, you have no video capture hardware.\r\n\r\nVideo capture will not function properly."));

		//如果没有设备，返回

		return ; 

	} 



	IMoniker *pMoniker = NULL;

	//如果先前的createclassenumerator调用成功了，可以用ienummoniker::next得到设备

	if(pClsEnum->Next(1,&pMoniker,NULL)==S_OK)

	{

		//调用imoniker::bindtoobject建立一个和选择的device联合的filter

		pMoniker->BindToObject(0,0,IID_IBaseFilter,(void **)&pSrc);

		pMoniker->Release();

	}



	//将设备添加到管理器graph

	hr = pGraph->AddFilter(pSrc, L"Video Capture");

//---------------------------------------------------------------------------

//视频开始采集----------------------------------------------------------------//

IFileSinkFilter* fsFilter=NULL;

	IBaseFilter* vedioWriter=NULL;    //设置保存文件并初始化vedioWriter

	hr=pBuild->SetOutputFileName(&MEDIASUBTYPE_Avi,L"D:\\A.avi",&vedioWriter,&fsFilter);



	//保存文件

	hr=pBuild->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,pSrc,NULL,vedioWriter);

	

	IMediaControl *pMC = NULL;

	hr=pGraph->QueryInterface(IID_IMediaControl, (void **)&pMC);



	hr=pMC->Run();    //运行Filter Graph	if(FAILED(hr))

	{

		MessageBox(_T("加载运行失败！"));  

		return ;

	}