Re: [PATCH v2 0/1] MR4545: mf: tests: Add test cases for evr events.

[Yuxuan Shui (＠yshui)]

Yuxuan Shui (@yshui) commented about dlls/mf/tests/mf.c:
> - hr = IMFPresentationClock_Pause(clock);
> - ok(hr == MF_E_INVALIDREQUEST, "Unexpected hr %#lx.\n", hr);
> - ensure_no_events(event_generator, 100);
> -
> - hr = IMFPresentationClock_Start(clock, 0);
> - ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
> - check_event(event_generator, MEStreamSinkStarted, 100);
> - check_event(event_generator, MEStreamSinkRequestSample, 100);
> -
> - hr = IMFPresentationClock_Pause(clock);
> - ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
> - check_event(event_generator, MEStreamSinkPaused, 100);
> -
> - hr = IMFMediaSinkPreroll_NotifyPreroll(sink_preroll, 10000000 / 60 * sample_count);
> - ok(hr == S_OK, "Unexpected hr %#lx.\n", hr);
> - ensure_no_events(event_generator, 100);

this means there is currently a bug in media session, as it tries to preroll the evr again when restarting from a pause. but an evr that was prerolled won't generate `MEStreamSinkPrerolled` again.