[Bug 765795] glimagesink: support video frame rotation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765795

--- Comment #6 from Haihua Hu <jared.hu at nxp.com> ---
(In reply to Sebastian Dröge (slomo) from comment #5)
> It might also make sense to do this as another element inside glimagesink,
> just like glvideobalance, etc.

You mean something like "glvideoflip" and put it into glimagesinkbin. The main
concern is performance, if we just put it in glimagesink as a property, we only
need to calculate texture coordinate when the property changes, but if we treat
it as a plugin,we need to do fbo rendering on every buffer, this will cost some
time and will cause performance downgrade. So I think property is better.

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