Directshow Audio Question
-
Hi I have successfully got Directshow outputing a video from C++ MFC using Sample Grabber, but I can not figure out how to play the audio with this. I have attached code snippet of what I have done currently, can anyone tell me what I need to do to get audio stream to work. I have added the sound renderer filter, just dont know how to connect it with the rest of the graph. Thanks HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph); hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl); hr = pGraph->QueryInterface(IID_IMediaEventEx, (void **)&pEvent); hr = pGraph->QueryInterface(IID_IBasicAudio, reinterpret_cast<void**>(&m_pAudio)); hr = pGraph->QueryInterface(IID_IMediaSeeking, reinterpret_cast<void**>(&pSeeking)); hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pGrabberF); if (FAILED(hr)) { // Return an error. } hr = pGraph->AddFilter(pGrabberF, L"Sample Grabber"); CoCreateInstance(CLSID_DSoundRender, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&g_pSoundRenderer); hr = pGraph->AddFilter(g_pSoundRenderer, NULL); // hr = CoCreateInstance(CLSID_SampleGrabber, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, (void**)&pGrabberF); // hr = pGraph->AddFilter( if (FAILED(hr) ) { // Return an error. } pGrabberF->QueryInterface(IID_ISampleGrabber, (void**)&pGrabber); //ZeroMemory(&mt, sizeof(AM_MEDIA_TYPE)); mt.majortype = MEDIATYPE_Stream; //mt.subtype = GUID_NULL;//MEDIASUBTYPE_RGB24; hr = pGrabber->SetMediaType(&mt); hr = pGraph->AddSourceFilter(fileName.AllocSysString(), L"Source", &pSrc); if (FAILED(hr)) { // Return an error code. } hr = ConnectFilters(pGraph, pSrc, pGrabberF); // Create the NULL renderer and connect hr = CoCreateInstance(CLSID_NullRenderer, NULL, CLSCTX_INPROC_SERVER, IID_IBaseFilter, reinterpret_cast<void**>(&m_pNullRenderer)); hr = pGraph->AddFilter(m_pNullRenderer, L"NullRenderer"); hr = ConnectFilters(pGraph, pGrabberF, m_pNullRenderer);