BeginGetEvent    1520 modules/videoio/src/cap_msmf.hpp     HRESULT STDMETHODCALLTYPE BeginGetEvent(
BeginGetEvent     178 modules/videoio/src/cap_winrt/MediaStreamSink.cpp HRESULT MediaStreamSink::BeginGetEvent(__in IMFAsyncCallback *callback, __in_opt IUnknown *state)