[Bug 796516] kms: add support for kms atomic api

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796516

--- Comment #11 from Randy Li (ayaka) <ayaka at soulik.info> ---
Created attachment 372748
  --> https://bugzilla.gnome.org/attachment.cgi?id=372748&action=edit
try to add page flip

I found the page flip doesn't want as I though in the drm atomic API.
I wish to push a bunch of atomic request to drm system, then driver would
decide which frame can be displayed or dropped.
But I can't get the event from those dropped frame, so I don't have a chance to
unreference them, making a big problem in buffer management.
And I meet serious screen stretched, frame dropped and screen frozen
temporarily during playback with that.
May I should just wait the getting the event of the previous frame, then
display the current frame?

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