Trouble adding source filter for WMV

**abachler** · 07-02-2008

here is the code

Code:

    HRESULT hr;
    pthis->HasPTZ = FALSE;
    pthis->PanLocation  = 0;
    pthis->TiltLocation = 0;
    //----------------------------//
    //  Create the Source Filter  //
    //----------------------------//
    hr = CoCreateInstance(  CLSID_WMAsfReader  ,
                            NULL , 
                            CLSCTX_INPROC_SERVER ,
                            IID_IGraphBuilder ,
                            (void**)&pthis->pCapFilter);
    if(FAILED(hr)){
        pthis->FailPoint = 1;
        return hr;
        }
    hr = pthis->pCapFilter->QueryInterface(IID_IFileSourceFilter , (void**)&pthis->pFileSource);
    if(FAILED(hr)){
        MessageBox(NULL , "Failed to QueryInterface(IID_IFileSourceFilter)" , "DirectShow Error" , MB_OK);
        return hr;
        }
 
    hr = pthis->pFileSource->Load("C:/iei/test.wmv" , &pthis->MediaType);
    if(FAILED(hr)){
        MessageBox(NULL , "Failed to Load File" , "DirectShow Error" , MB_OK);
        return hr;
        }
    pthis->pDecoder = pthis->pCapFilter;
    return hr;

Its not returning an error but the filter graph later fails to render the stream. The remaining code works with other source filters, so that code is not the problem. Amazingly enough, just using IGraphBuilder::AddSourceFilter() doesnt work either.

**Elysia** · 07-02-2008

Did you try debugging with GraphEdit?
You can use the following code to "add to rot":

Code:

	HRESULT AddToRot(IUnknown* pGraph, DWORD /*dwName*/, DWORD* pdwRegister)
	{
		IMoniker* pMoniker = NULL;
		IRunningObjectTable* pROT = NULL;

		if (FAILED( GetRunningObjectTable(0, &pROT) )) return E_FAIL;

		const size_t STRING_LENGTH = 256;
		WCHAR wsz[STRING_LENGTH];
		StringCchPrintfW(wsz, STRING_LENGTH, L"FilterGraph %08x pid %08x", (DWORD*)pGraph, GetCurrentProcessId());

		HRESULT hr = CreateItemMoniker(L"!", wsz, &pMoniker);
		if (SUCCEEDED(hr)) 
		{
			hr = pROT->Register(ROTFLAGS_REGISTRATIONKEEPSALIVE, pGraph, pMoniker, pdwRegister);
			pMoniker->Release();
		}
		pROT->Release();

		return hr;
	}

	void RemoveFromRot(DWORD dwRegister)
	{
		IRunningObjectTable *pROT;
		if (SUCCEEDED( GetRunningObjectTable(0, &pROT) )) 
		{
			pROT->Revoke(dwRegister);
			pROT->Release();
		}
	}

**abachler** · 07-03-2008

See, thats one thing, Graphedit renders the file properly, running it through ffdshow, which means that RenderStream() should properly connect the source filter to the sample grabber through ffdshow, but it doesnt.

Oh, im using ICaptureGraphBuilder2, not IGraphBuilder as I stated earlier.

Code:

    hr = this->pBuilder->RenderStream(  NULL , 
                                        NULL , 
                                        this->pDecoder ,
                                        this->pGrabberF ,
                                        this->pNullRenderer);

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