[Bug 790149] vaapipostproc: Does not maintain aspect ratio when scaling

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790149

--- Comment #10 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #9)
> Created attachment 367038 [details] [review]
> vaapipostproc: keep the display's pixel aspect ratio
> 
> Before vaapipostproc will resize the video frame to the window size,
> but that broke the display's pixel aspect ratio form the original
> video.
> 
> This patch will honor the original pixel-aspect-ratio by setting a
> target rectangle within the output surface, that means black borders.

This patch works regular with intel-vaapi-driver, it shows some artifacts and
the image is not centered.

In the case of mesa amd driver, it is worse since it crashes.

Dunno, perhaps it is a code path no quite tested by drivers. Still, it seems
the correct way to do it.

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