根据clsid取得取得filter.docx

CoInitialize(NULL); HRESULT hr; IGraphBuilder* pGraphBuilder=NULL; CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC, IID_IGraphBuilder, (void *)&pGraphBuilder); IBaseFilter*pMpeg4PSFileStream; IBaseFilter*pMpegDemuxFilter; IBaseFilter*pMpeg4VideoDecoder; IBaseFilter*pOverlayMaxer2; IBaseFilter*pVideoRenderer; hr=CoCreateInstance(CLSID_Mpeg4PSFileStream, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void*)&pMpeg4PSFileStream); if (FAILED(hr) AfxMessageBox(err create CLSID_Mpeg4PSFileStream); hr=CoCreateInstance(CLSID_MpegDemuxFilter, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void*)&pMpegDemuxFilter); if (FAILED(hr) AfxMessageBox(err create CLSID_MpegDemuxFilter); hr=CoCreateInstance(CLSID_Mpeg4VideoDecoder, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void*)&pMpeg4VideoDecoder); if (FAILED(hr) AfxMessageBox(err create CLSID_Mpeg4VideoDecoder); hr=CoCreateInstance(CLSID_OverlayMaxer2, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void*)&pOverlayMaxer2); if (FAILED(hr) AfxMessageBox(err create CLSID_OverlayMaxer2); hr=CoCreateInstance(CLSID_VideoRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void*)&pVideoRenderer); if (FAILED(hr) AfxMessageBox(err create CLSID_VideoRenderer); pGraphBuilder-AddFilter(pMpeg4PSFileStream, NULL); pGraphBuilder-AddFilter(pMpegDemuxFilter, NULL); pGraphBuilder-AddFilter(pMpeg4VideoDecoder , NULL); pGraphBuilder-AddFilter(pOverlayMaxer2 , NULL); pGraphBuilder-AddFilter(pVideoRenderer , NULL); /set the source file IFileSourceFilter * pLoader; pMpeg4PSFileStream-QueryInterface(IID_IFileSourceFilter, (void *)&pLoader); hr=pLoader-Load(LE:tempmpeg4_ps.mpg,NULL); if (FAILED(hr) AfxMessageBox(装载文件出错！); /connect filter char *strPinName = new char; IEnumPins*EnumPins; IPin*OutPin; IPin*InPin; ULONGfetched; PIN_INFOpinfo; / find source output pMpeg4PSFileStream-EnumPins(&EnumPins); EnumPins-Reset(); EnumPins-Next(1, &OutPin, &fetched);/ only 1 pin for source, so we know this is the one we need EnumPins-Release(); / find Demux Filter input pMpegDemuxFilter-EnumPins(&EnumPins); EnumPins-Reset(); EnumPins-Next(1, &InPin, &fetched); InPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release();/ make sure you release the returned IBaseFilter interface while (pinfo.dir = PINDIR_OUTPUT)/ check if we have wrong pin (not input pin),2 output pin InPin-Release(); EnumPins-Next(1, &InPin, &fetched);/ if so, get next pin InPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release(); / connect - 1 pGraphBuilder-Connect(OutPin, InPin); InPin-Release(); OutPin-Release(); / find Demux Filter output EnumPins-Reset(); EnumPins-Next(1, &OutPin, &fetched); OutPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release(); if (pinfo.dir = PINDIR_INPUT)/ check if we have wrong pin (not input pin),only 1 input pin InPin-Release(); EnumPins-Next(1, &OutPin, &fetched);/ if so, get next pin EnumPins-Release(); / find Vweb Mpeg4 Video Decoder input pMpeg4VideoDecoder-EnumPins(&EnumPins); EnumPins-Reset(); EnumPins-Next(1, &InPin, &fetched); InPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release();/ make sure you release the returned IBaseFilter interface if (pinfo.dir = PINDIR_OUTPUT)/ check if we have wrong pin (not input pin),only 1 input pin InPin-Release(); EnumPins-Next(1, &InPin, &fetched);/ if so, get next pin / connect - 2 pGraphBuilder-Connect(OutPin, InPin); InPin-Release(); OutPin-Release(); / find Vweb Mpeg4 Video Decoder output * EnumPins-Reset(); EnumPins-Next(1, &OutPin, &fetched); OutPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release();/ make sure you release the returned IBaseFilter interface if (pinfo.dir = PINDIR_INPUT)/ check if we have wrong pin (not input pin),only 1 input pin OutPin-Release(); EnumPins-Next(1, &OutPin, &fetched);/ if so, get next pin OutPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release(); WCHAR *s=pinfo.achName; EnumPins-Release(); / find Overlay Mixer2 input pOverlayMaxer2-EnumPins(&EnumPins); EnumPins-Reset(); EnumPins-Next(1, &InPin, &fetched); InPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release();/ make sure you release the returned IBaseFilter interface WCHAR *s=pinfo.achName; if (pinfo.dir = PINDIR_OUTPUT)/ check if we have wrong pin (not input pin),2 input pin InPin-Release(); EnumPins-Next(1, &InPin, &fetched);/ if so, get next pin / connect - 3 pGraphBuilder-Connect(OutPin, InPin); InPin-Release(); OutPin-Release(); / find Overlay Mixer2 output EnumPins-Reset(); EnumPins-Next(1, &OutPin, &fetched); OutPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release();/ make sure you release the returned IBaseFilter interface while (pinfo.dir = PINDIR_INPUT)/ check if we have wrong pin (not input pin),2 input pin OutPin-Release(); EnumPins-Next(1, &OutPin, &fetched);/ if so, get next pin OutPin-QueryPinInfo(&pinfo); pinfo.pFilter-Release(); WCHAR *s=pinfo.achName; EnumPins-Release(); / find renderer input pVideoRenderer-EnumPins(&EnumPins); EnumPins-Reset(); EnumPins-Next(1, &InPin, &fetched);/ renderer has only 1 pin, so this is the pin we need EnumPins-Release(); / connect - 4 pGraphBuilder-Connect(OutPin, InPin); InPin-Release(); OutPin-Release(); IMediaEvent *pEvent; IMediaControl *pMediaControl; / Create the filter graph manager and query for interfaces. hr=pGraphBuilder-QueryInterface(IID_IMediaControl, (void *)&pMediaControl); hr=pGraphBuilder-QueryInterface(IID_IMediaEvent, (void *)&pEvent); / Run the graph. pMediaControl-Run(); / Wait for completion. long evCode; pEvent-WaitForCompletion(INFINITE, &evCode); / Clean up. pMpeg4PSFileStream-Release(); pMpegDemuxFilter-Release(); pMpeg4VideoDecoder-Release(); pOverlayMaxer2-Release(); pVideoRenderer-Release(); pMediaControl-Release(); pEvent-Release(); pGraphBuilder-Release(); delete strPinName; CoUninitialize(); 长枪大戟的代码都已经包括了,不过听说不在directshow filter里的filter需要枚举才能正常使用,但是我没有试过,不知道是不是,以下代码是枚举捕捉设备的. HRESULT CCaptureEx:FindCaptureDevice(IBaseFilter *ppSrcFilter) HRESULT hr; IBaseFilter * pSrc = NULL; CComPtr pMoniker =NULL; ULONG cFetched; if (!ppSrcFilter) return E_POINTER; / Create the system device enumerator CComPtr pDevEnum =NULL; hr = CoCreateInstance (CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC, IID_ICreateDevEnum, (void *) &pDevEnum); if (FAILED(hr) Msg(TEXT(Couldnt create system enumerator!hr=0x%x), hr); return hr; / Create an enumerator for the video capture devices CComPtr pClassEnum = NULL; hr = pDevEnum-CreateClassEnumerator (CLSID_VideoInputDeviceCategory, &pClassEnum, 0); if (FAILED(hr) /Msg(TEXT(Couldnt create class enumerator!hr=0x%x), hr); return hr; / If there are no enumerators for the requested type, then / CreateClassEnumerator will succeed, but pClassEnum will be NULL. if (pClassEnum = NULL) return E_FAIL; / Use the first video capture device on the device list. / Note that if the Next() call succeeds but there are no monikers, / it will return S_FALSE (which is not a failure).Therefore, we / check that the return code is S_OK instead of using SUCCEEDED() macro. if (S_OK = (pClassEnum-Next (1, &pMoniker, &cFetched) / Bind Moniker to a filter object hr = pMoniker-BindToObject(0,0,IID_IBaseFilter, (void*)&pSrc); if (FAILED(hr) /Msg(TEXT(Couldnt bind moniker to filter object!hr=0x%x), hr); return hr; else /Msg(TEXT(Unable to access video capture device!); return E_FAIL; / Copy the found filter pointer to the output parameter. / Do NOT Release() the reference, since it will still be used / by the calling function. *ppSrcFilter = pSrc; return hr; / 根据Filter的DisplayName来获取其IMoniker指针,并将IMoniker指针绑定到一个IBaseFilter指针中 HRESULT CDXGraph:DisplayNameToMoniker(WCHAR * szDisplayName, IBaseFilter * ppBf) if (! mGraph | ! szDisplayName| ! ppBf) return E_POINTER; IBaseFilter *pFilter = NULL; IBindCtx *pBindCtx; HRESULT hr = CreateBindCtx(0, &pBindCtx); ULONG chEaten = 0; CComPtr pMoniker = NULL; hr = MkParseDisplayName(pBindCtx, szDisplayName, &chEaten, &pMoniker); pBindCtx-Release(); if (SUCCEEDED(hr) hr = pMoniker-BindToObject(NULL, NULL, IID_IBaseFilter,(void *)&pFilter); if (FAILED(hr) AfxMessageBox(TEXT(Couldnt bind moniker to filter object!); return E_FAIL; / Copy the found filter pointer to the output parameter. / Do NOT Release() the reference, since it will still be used / by the calling function. *ppBf = pFilter; return hr; return hr; /使用xvid mpge4的代码，其中szDisplay存储的是Filter的DisplayName,可以重GraphEdit中查看 WCHAR szDisplay = Ldevice:cm:33D9A760-90C8-11D0-BD43-00A0C911CE86xvid; if (SUCCEEDED(mFilterGraph-DisplayNameToMoniker(szDisplay, &pVideoCompressFilter) if (SUCCEEDED(mFilterGraph-GetGraph()-AddFilter(pVideoCompressFilter,LXVid MPEG-4 Codec) /pVideoCompressFilter-Release(); / 获取视频采集的Capture Source Filter和FriendlyName HRESULT CDXGraph:EnumVideoCaptureSource(IBaseFilter * ppBf, WCHAR* szFilterName) if (!mGraph | ! ppBf) return E_POINTER; / Create the System Device Enumerator. IBaseFilter *pFilter = NULL; HRESULT hr; CComPtr pSysDevEnum = NULL; hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, (void *)&pSysDevEnum); if (FAILED(hr) return hr; / Obtain a class enumerator for the video capture Source category. CComPtr pEnumCat = NULL; hr = pSysDevEnum-CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEnumCat, 0); if (FAILED(hr) AfxMessageBox(Create class enumerator for the video capture Failed.); return hr; / If there are no enumerators for the requested type, then / CreateClassEnumerator will succeed, but pClassEnum will be NULL. if (pEnumCat = NULL) CString str(); str += TEXT(No video capture device was detected.rnrn); str += TEXT(This sample requires a video capture device, such as a USB WebCam,rn); str += TEXT(This sample requires a video capture device, such as a USB WebCam,rn); str += TEXT(This sample requires a video capture device, such as a USB WebCam,rn); str += TEXT(to be installed and working properly.The sample will now close.); AfxMessageBox(str); return E_FAIL; / Use the first video capture device on the device list. / Note that if the Next() call succeeds but there are no monikers, / it will return S_FALSE (which is not a failure).Therefore, we / check that the return code is S_OK instead of using SUCCEEDED() macro. CComPtr pMoniker = NULL; U