Media Foundation EVR and DirectX 11

Question

I am trying to write an EVR for Media Foundation using DirectX 11 on Windows 10 (Desktop). The only one solution I have found so far is here Unfortunately I don't know (as many others) how to correctly use it. Does somebody can point me to the right direction on how to combine MF with DirectX 11/12 please?

I am using the code for activate my EVR:

hr = MFCreateVideoRendererActivate(hwndVideo, &pRendererActivate);
hr = pRendererActivate->SetGUID(MF_ACTIVATE_CUSTOM_VIDEO_PRESENTER_CLSID, CLSID_DX11VideoRenderer);

I came to the point where MF asks for GetDeviceID and an exception is raised in kernel.dll. I think that there is a mismatch between a mixer and renderer device. Default device for them is DX9. In my example I must provide a DirectX 11 device CLSID.

Answer 1

DX11VideoRenderer is a good example to show how to use Dx11 based presenter. However there aren't much code snippet to demonstrate how to use it.

There are two ways you could look into:

1. Register the compiled DX11VideoRenderer COM CLSID using regsvr32, and add it in the TopoEdit.

2. Use without register.

   • Call LoadLibrary() to the dll.
   • Call GetProcAddress() to get pfn of DllGetClassObject().
   • Call above pfn with CLSID_DX11VideoRenderer and IID_IClassFactory to retrieve the media sink factory.
   • Use media sink factory to create media sink.
   • Add media sink to topology.

Code snippet:

typedef HRESULT(_stdcall *PFN_GetClassObject)(REFCLSID, REFIID, LPVOID*);
HMODULE hSink = NULL;
PFN_GetClassObject pfn = NULL;
HRESULT hr = E_FAIL;
IClassFactory *pMediaSinkFactory = NULL;
IMFMediaSink *pMediaSink = NULL;

hSink = ::LoadLibraryEx(L“DX11VideoRenderer.dll”, 
            NULL, 
            LOAD_LIBRARY_SEARCH_DEFAULT_DIRS | LOAD_LIBRARY_SEARCH_DLL_LOAD_DIR);

if(hSink)
    pfn = (PFN_GetClassObject)GetProcAddress(
            hSink, 
            "DllGetClassObject");

if(pfn)
    hr = pfn(CLSID_DX11VideoRenderer, 
            IID_IClassFactory, 
            (LPVOID*)&pMediaSinkFactory);

if(pMediaSinkFactory){
    pMediaSinkFactory->CreateInstance(NULL, 
        __uuidof(IMFMediaSink), 
        (LPVOID*)&pMediaSink);
    pMediaSinkFactory->Release();
}