关于摄像头叠加文字的问题

strangefay 2010-01-21 06:47:37

最近公司有需求要做这方面的工作
小弟以前从未接触过, 因此前来询问一下

截取采用的是DirectShow
叠加字幕采用的陆其名先生的一个filter
在graphedt中拼接成功, 但是写到程序里确怎么也成功不了
代码如下大家应该一眼就能看明白...

谢谢大家了 ^_^



{{

		// 创建IGraphBuilder接口

		hr=CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&(m_pGB));

		CHECK_RET(hr);

		// 创建ICaptureGraphBuilder2接口

		hr = CoCreateInstance (CLSID_CaptureGraphBuilder2 , NULL, CLSCTX_INPROC,

			IID_ICaptureGraphBuilder2, (void **) &(m_pCapture));

		CHECK_RET(hr);



		m_pCapture->SetFiltergraph(m_pGB);

		hr = m_pGB->QueryInterface(IID_IMediaControl, (void **)&(m_pMC));

		CHECK_RET(hr);

	}}



	if(!BindFilter(0, &(m_pBF)))

	{

		LogD(_Q_D,L"[摄像头]-[BindFilter失败]");

		return E_FAIL;

	}



	hr = m_pGB->AddFilter(m_pBF, L"Capture Filter");

	if(FAILED(hr))

	{

		LogD(_Q_D,L"[摄像头]-[AddFilter失败]");

		return hr;

	}



	//Added Code



	const GUID CLSID_AVIDecompress ={0xCF49D4E0, 0x1115, 0x11CE, 0xB0, 0x3A, 0x00, 0x20, 0xAF, 0x0B, 0xA7, 0x70};

	hr = AddFilterByCLSID(m_pGB, CLSID_AVIDecompress, TEXT("AVI Decompressor"),&m_pAviDec);

	if (FAILED(hr))

	{

		LogD(_Q_D,L"[摄像头]-[OSDFilter加载失败]");

		AfxMessageBox(TEXT("Capturefliter to OSDFilter load fail!"));

	}



	const GUID CLSID_FilterFont ={0xe3fb4bfe, 0x8e5c, 0x4aec, 0x81, 0x62, 0x7d, 0xa5, 0x5b, 0xe4, 0x86, 0xa1};

	hr = AddFilterByCLSID(m_pGB,CLSID_FilterFont, TEXT("HQ Title Overlay Std."),&m_pMuxOsd);

	if (FAILED(hr))

	{

		LogD(_Q_D,L"[摄像头]-[OSDFilter加载失败]");

		AfxMessageBox(TEXT("Capturefliter to OSDFilter load fail!"));

	}



	hr = ConnectFilters(m_pGB,m_pBF,m_pAviDec); 

	if (FAILED(hr))

	{

		LogD(_Q_D,L"[摄像头]-[OSDFilter连接失败]");

		AfxMessageBox(TEXT("Capturefliter to OSDFilter connect fail!"));

	}



	hr = ConnectFilters(m_pGB,m_pAviDec,m_pMuxOsd); 

	if (FAILED(hr))

	{

		LogD(_Q_D,L"[摄像头]-[OSDFilter连接失败]");

		AfxMessageBox(TEXT("Capturefliter to OSDFilter connect fail!"));

	}



	IBaseFilter *pMux = NULL; 

	m_pCapture->SetOutputFileName(&MEDIASUBTYPE_Asf, 

		m_sFileName.c_str(),

		&pMux,

		NULL);



	if(pMux == NULL)

	{

		LogD(_Q_D,L"[摄像头]-[SetOutputFileName失败]");

	}



	IConfigAsfWriter *pConfig = 0;

	hr = pMux->QueryInterface(IID_IConfigAsfWriter, (void**)&pConfig);

	if (SUCCEEDED(hr))

	{

		pConfig->ConfigureFilterUsingProfileGuid(WMProfile_V80_288VideoOnly);

		pConfig->Release();

	}



	//hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF,NULL,pMux);

	hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, m_pBF, NULL, pMux);

	if( FAILED( hr ) )

	{

		LogD(_Q_D,L"[摄像头]-[RenderStream失败]");

		//hr = m_pCapture->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video,m_pBF,NULL,pMux);

		hr = m_pCapture->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, m_pBF, NULL, pMux);

	}	



	pMux->Release();