Question

我有这个代码用于流式传输到流缓冲区或从流缓冲区流式传输。我已将所有错误检出，以便让代码更易于阅读并查看我正在做的事情。

ICaptureGraphBuilder2*  pCaptureGraphBuilder = nullptr;

IGraphBuilder*          pGraphCapture = nullptr;
IMediaControl*          pControlCapture = nullptr;

IGraphBuilder*          pGraphStream = nullptr;
IMediaControl*          pControlStream = nullptr;

IBaseFilter*            pFilterVideoIn = nullptr;
IBaseFilter*            pFilterDVEncode = nullptr;

IBaseFilter*            pFilterBufferCapture = nullptr;
IBaseFilter*            pFilterBufferStream = nullptr;

// streams
IStreamBufferSink2*     pBufferCapture = nullptr;
IStreamBufferSource*    pBufferStream = nullptr;

// This sets up the streaming capture
HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pCaptureGraphBuilder));

hr = CoCreateInstance(CLSID_FilterGraph,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pGraphCapture));
hr = pCaptureGraphBuilder->SetFiltergraph(pGraphCapture);
hr = pGraphCapture->QueryInterface(IID_IMediaControl,(VOID**)&pControlCapture);

hr = EnumClassForFilterName(CLSID_VideoInputDeviceCategory,TEXT_CAPTUREDEVICE,&pFilterVideoIn); // This functions creates an instance of the capture device
hr = pGraphCapture->AddFilter(pFilterVideoIn,L"VideoIn");

hr = CoCreateInstance(CLSID_DVVideoEnc,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pFilterDVEncode));
hr = pGraphCapture->AddFilter(pFilterDVEncode,L"DVEncoder");

hr = CoCreateInstance(CLSID_StreamBufferSink,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pBufferCapture));
hr = pBufferCapture->QueryInterface(IID_PPV_ARGS(&pFilterBufferCapture));
hr = pGraphCapture->AddFilter(pFilterBufferCapture,L"BufferSink");

hr = pCaptureGraphBuilder->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,pFilterVideoIn,pFilterDVEncode,pFilterBufferCapture);

hr = pBufferCapture->LockProfile(L"C:\\save.tmp");

// now work on the stream in
hr = CoCreateInstance(CLSID_FilterGraph,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pGraphStream));
hr = pGraphStream->QueryInterface(IID_IMediaControl,(VOID**)&pControlStream);

hr = CoCreateInstance(CLSID_StreamBufferSource,nullptr,CLSCTX_INPROC_SERVER,IID_PPV_ARGS(&pBufferStream));
hr = pBufferStream->QueryInterface(IID_PPV_ARGS(&pFilterBufferStream));
hr = pGraphStream->AddFilter(pFilterBufferStream,L"StreamBufferSource");

hr = pBufferStream->SetStreamSink(pBufferCapture);

IEnumPins* pEnumPins = nullptr;
IPin* pPin = nullptr;
hr = pFilterBufferStream->EnumPins(&pEnumPins);
while(pEnumPins->Next(1,&pPin,nullptr) == S_OK){
    hr = pGraphStream->Render(pPin);
    pPin->Release();
}

// Which filters are really in the graph

// capture graph
OutputDebugString(L"-----------------------\n");
OutputDebugString(L"StreamIn Graph Filters\n");
OutputDebugString(L"\n");

IEnumFilters* pFilterEnum = nullptr;
IBaseFilter* pFilter = nullptr;
WCHAR name[256] = {0};
hr = pGraphCapture->EnumFilters(&pFilterEnum);
while(pFilterEnum->Next(1,&pFilter,nullptr) == S_OK){
    FILTER_INFO fi={0};
    pFilter->QueryFilterInfo(&fi);
    StringCchPrintf(name,255,L"%s\n",fi.achName);
    OutputDebugString(name);

    fi.pGraph->Release();
    pFilter->Release();
}
OutputDebugString(L"-----------------------\n");

// stream graph
OutputDebugString(L"-----------------------\n");
OutputDebugString(L"StreamSource Graph Filters\n");
OutputDebugString(L"\n");

pFilterEnum = nullptr;
pFilter = nullptr;
hr = pGraphStream->EnumFilters(&pFilterEnum);
while(pFilterEnum->Next(1,&pFilter,nullptr) == S_OK){
    FILTER_INFO fi={0};
    pFilter->QueryFilterInfo(&fi);
    WCHAR name[256]={0};
    StringCchPrintf(name,256,L"%s\n",fi.achName);
    OutputDebugString(name);

    fi.pGraph->Release();
    pFilter->Release();
}
OutputDebugString(L"-----------------------\n");

hr = pControlCapture->Run();
hr = pControlStream->Run();

[SNIP]

一旦第二张图开始以

运行，它就会崩溃

First-chance exception at 0x000007fef3ce42e0 (qdv.dll) in StreamBuffer.exe: 0xC0000005: Access violation reading location 0x00000000000001c5.
Unhandled exception at 0x000007fef3ce42e0 (qdv.dll) in StreamBuffer.exe: 0xC0000005: Access violation reading location 0x00000000000001c5.

这告诉我qdv.dll里面有些东西不开心。所以我下载了调试符号，以帮助诊断真正发生的事情。

在调用堆栈中，我得到了

qdv.dll!CDVVideoCodec::Receive()  + 0x220 bytes 
qdv.dll!CTransformInputPin::Receive()  + 0x4c bytes 
qdv.dll!CBaseInputPin::ReceiveMultiple()  + 0x49 bytes  
sbe.dll!COutputQueue::ThreadProc()  + 0xca bytes    
sbe.dll!COutputQueue::InitialThreadProc()  + 0x1c bytes 
kernel32.dll!BaseThreadInitThunk()  + 0xd bytes 
ntdll.dll!RtlUserThreadStart()  + 0x21 bytes

这告诉我，也许我还没有在DVEncoder的其中一个图表中提供足够的信息。我已经为编解码器尝试了各种设置，但没有任何效果，我在同一个地方遇到同样的错误。

感谢所有帮助。

流缓冲区在qdv.dll Win7中崩溃

0 个答案: