[Bug 784599] kmssink: support videooverlay interface

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784599

--- Comment #97 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Ok, I'm a bit dumping a patch here, but this is a quick rework to handle aspect
ratio correctly. Basically, when we don't scale, we should not accept
pixel-aspect-ratio that don't match the display. As a side effect, I could
remove and simplify some code all around.

For those testing on Intel like me, be aware that the scaler may have serious
limitation, it does not fail and render a cropped image that is wrong. For my
case, scaling down is very limited, while scaling up seems to do anything. E.g.
It fails if I try to render 4K, it simply crop it.

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