Re: [PATCH 0/4] MR1046: MfMediaEngine audio and invalid format fix.

[Nikolay Sivov (＠nsivov)]

Nikolay Sivov (@nsivov) commented about dlls/mfmediaengine/main.c:
>  }
>
>  memcpy(&subtype, &MFVideoFormat_Base, sizeof(subtype));
> - if (!(subtype.Data1 = MFMapDXGIFormatToDX9Format(output_format)))
> - while (!(subtype.Data1 = MFMapDXGIFormatToDX9Format(output_format)))
> {
> -
>    WARN("Unrecognized output format %#x.\n", output_format);
> -
>    return E_FAIL;
> -
>    WARN("Unrecognized output format %#x, using DXGI_FORMAT_B8G8R8A8_UNORM as fallback.\n", output_format);
> -
>    output_format = DXGI_FORMAT_B8G8R8A8_UNORM;
> }

Why this format in particular, and why a "while" loop?