Re: [PATCH 0/4] MR2778: mfmediaengine: Add support for video effects.

[Nikolay Sivov (＠nsivov)]

Nikolay Sivov (@nsivov) commented about dlls/mfmediaengine/tests/mfmediaengine.c:
> CloseHandle(notify.ready_event);
>  }
>
> +struct grayscale_video_effect
> +{
> +    IMFTransform IMFTransform_iface;
> +    LONG refcount;
> +
> +    IMFMediaType *media_type_in, *media_type_out;
> +    DWORD frame_size, frame_width, frame_height;
> +    GUID **advertized_subtypes;
> +    IMFSample *sample_buf;
> +    LONG processing_delta;
> +    CRITICAL_SECTION cs;
> +};

This is way too much for such test. It would be enough to have some stub transform that outputs solid color fills, ignoring input completely.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/2778#note_32368