directshow强连自己的filter

以播放一个以h264编码，声音以AAC编码的mp4文件为例

可以在graphEdit中看到coreAVC video decoder的guid值 09571A4B-F1FE-4C60-9760-DE6D310C7C31

//09571A4B-F1FE-4C60-9760-DE6D310C7C31 如果是自己写的filter，肯定有GUID值，这是如果连接uuids.h中

//没有的CLSID，要自己重新定义一下 ,

static const GUID CLSID_coreAVC = 

{ 0x09571A4B, 0xF1FE, 0x4C60, { 0x97, 0x60, 0xDE, 0x6D, 0x31, 0x0C, 0x7C, 0x31 } };

下面是完整的播放一个mp4文件（视频以h264编码，声音以AAC编码）的代码

play()

{

        CoInitialize(NULL);

IGraphBuilder *pGraph = NULL;

IMediaControl *pControl = NULL;

IMediaEvent   *pEvent = NULL;

HRESULT hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, 

IID_IGraphBuilder, (void **)&pGraph);

if (FAILED(hr))

{

printf("ERROR - Could not create the Filter Graph Manager.");

return;

}

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

hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);

// Build the graph. IMPORTANT: Change this string to a file on your system.

hr = pGraph->RenderFile(L"D://test_my.mp4", NULL);

IBaseFilter *spliteFilter;

hr=FindSplitterFilter(pGraph,&spliteFilter);    //寻找分离器

NukeDownstream(pGraph,spliteFilter);           //删除分离器以下的所有filter

IBaseFilter*pDecode,*pDisplay;

      //能过CLSID加入视频显示的filter   如果是自己写的filter，替换成自己filter的CLSID即可

hr=AddFilterByCLSID(pGraph,CLSID_VideoRendererDefault,L"video Render",&pDisplay);  

 //能过CLSID加入coreAVC

hr=AddFilterByCLSID(pGraph,CLSID_coreAVC,L"core AVC",&pDecode);

IPin*pPin0=0;

IPin*pPin1=0;

if (spliteFilter)

{

hr=GetPin(spliteFilter,PINDIR_OUTPUT,0,&pPin0);

hr=GetPin(spliteFilter,PINDIR_OUTPUT,1,&pPin1);

}

if (pPin1)

{

hr=pGraph->Render(pPin0);

hr=pGraph->Render(pPin1);

pPin0->Release();

pPin1->Release();

}

pDecode->Release();

pDisplay->Release();

SaveGraphFile(pGraph,L"D://abc.grf");  //方便调试，看是否连接成功

       //播放

   if (SUCCEEDED(hr))

   {

   // Run the graph.

   hr = pControl->Run();

   if (SUCCEEDED(hr))

   {

  

   long evCode;

   pEvent->WaitForCompletion(INFINITE, &evCode);

   // Note: Do not use INFINITE in a real application, because it

  

   }

   }

pControl->Release();

pEvent->Release();

pGraph->Release();

    CoUninitialize();

}

HRESULT FindSplitterFilter(IGraphBuilder *pGraph,IBaseFilter **pSplitterFilter)

{

IEnumFilters *pEnumFilter=NULL;

HRESULT hr=pGraph->EnumFilters(&pEnumFilter);

if (SUCCEEDED(hr))

{

IBaseFilter *pFilter=NULL;

while (S_OK==pEnumFilter->Next(1,&pFilter,NULL))

{

int iOutPinCount=0;

// IPin *ppPin = 0;

IEnumPins *pEnumPin = 0;

IPin *pPin = 0;

hr = pFilter->EnumPins(&pEnumPin);

if (FAILED(hr))

{

return hr;

}

while (pEnumPin->Next(1, &pPin, NULL) == S_OK)

{

PIN_DIRECTION ThisPinDir;

pPin->QueryDirection(&ThisPinDir);

if (ThisPinDir == PINDIR_OUTPUT)

{

iOutPinCount++;

}

pPin->Release();

}

pEnumPin->Release();

if(iOutPinCount>=2)

{

*pSplitterFilter=pFilter;

return S_OK;

}

}

pEnumFilter->Release();

}

return E_FAIL;

}

void NukeDownstream(IGraphBuilder * inGraph, IBaseFilter * inFilter) 

{

if (inGraph && inFilter)

{

IEnumPins * pinEnum = 0;

if (SUCCEEDED(inFilter->EnumPins(&pinEnum)))

{

pinEnum->Reset();

IPin * pin = 0;

ULONG cFetched = 0;

bool pass = true;

while (pass && SUCCEEDED(pinEnum->Next(1, &pin, &cFetched)))

{

if (pin && cFetched)

{

IPin * connectedPin = 0;

pin->ConnectedTo(&connectedPin);

if(connectedPin) 

{

PIN_INFO pininfo;

if (SUCCEEDED(connectedPin->QueryPinInfo(&pininfo)))

{

if(pininfo.dir == PINDIR_INPUT) 

{

NukeDownstream(inGraph, pininfo.pFilter);

inGraph->Disconnect(connectedPin);

inGraph->Disconnect(pin);

inGraph->RemoveFilter(pininfo.pFilter);

}

pininfo.pFilter->Release();

}

connectedPin->Release();

}

pin->Release();

}

else

{

pass = false;

}

}

pinEnum->Release();

}

}

}

HRESULT AddFilterByCLSID(IGraphBuilder*pGraph,const GUID& clsid,LPCWSTR wszName,IBaseFilter**ppF)

{

if (!pGraph||!ppF)

return E_POINTER;

*ppF=0;

IBaseFilter*pF=0;

HRESULT hr=CoCreateInstance(clsid,0,CLSCTX_INPROC_SERVER,IID_IBaseFilter,reinterpret_cast<void**>(&pF));

if (SUCCEEDED(hr))

{

hr=pGraph->AddFilter(pF,wszName);

if (SUCCEEDED(hr))

*ppF=pF;

else

pF->Release();

}

return hr;

}

HRESULT SaveGraphFile(IGraphBuilder *pGraph, WCHAR *wszPath) 

{

const WCHAR wszStreamName[] = L"ActiveMovieGraph"; 

HRESULT hr;

IStorage *pStorage = NULL;

hr = StgCreateDocfile(

wszPath,

STGM_CREATE | STGM_TRANSACTED | STGM_READWRITE | STGM_SHARE_EXCLUSIVE,

0, &pStorage);

if(FAILED(hr)) 

{

return hr;

}

IStream *pStream;

hr = pStorage->CreateStream(

wszStreamName,

STGM_WRITE | STGM_CREATE | STGM_SHARE_EXCLUSIVE,

0, 0, &pStream);

if (FAILED(hr)) 

{

pStorage->Release();    

return hr;

}

IPersistStream *pPersist = NULL;

pGraph->QueryInterface(IID_IPersistStream, (void**)&pPersist);

hr = pPersist->Save(pStream, TRUE);

pStream->Release();

pPersist->Release();

if (SUCCEEDED(hr)) 

{

hr = pStorage->Commit(STGC_DEFAULT);

}

pStorage->Release();

return hr;

}

                                                                                    Harries.bai

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