Re: [PATCH 0/10] MR4439: mfplat: Implement MFInitAMMediaTypeFromMFMediaType and related functions.

[Nikolay Sivov (＠nsivov)]

Nikolay Sivov (@nsivov) commented about dlls/mfplat/mediatype.c:
> -    else if (IsEqualGUID(subtype, &MEDIASUBTYPE_YVYU))
> -        return &MFVideoFormat_YVYU;
> -    else if (IsEqualGUID(subtype, &MEDIASUBTYPE_NV12))
> -        return &MFVideoFormat_NV12;
> -    else
> +
> +    base = *subtype;
> +    base.Data1 = 0;
> +
> +    if (memcmp(&base, &MFVideoFormat_Base, sizeof(base)))
>      {
>          FIXME("Unknown subtype %s.\n", debugstr_guid(subtype));
>          return &null;
>      }
> +
> +    return subtype;
> Could you explain why this is useful?

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https://gitlab.winehq.org/wine/wine/-/merge_requests/4439#note_52829