BeginGetEvent    1530 modules/videoio/src/cap_msmf.hpp             hr = m_spEventQueue->BeginGetEvent(pCallback, punkState);
BeginGetEvent     186 modules/videoio/src/cap_winrt/MediaStreamSink.cpp         CHK(_eventQueue->BeginGetEvent(callback, state));
BeginGetEvent      62 modules/videoio/src/cap_winrt/MediaStreamSink.hpp     IFACEMETHODIMP BeginGetEvent(__in IMFAsyncCallback *callback, __in_opt IUnknown *state);