[Bug 766704] vaapi: sharing display handle between app and vaapi elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766704

--- Comment #23 from Hyunjun Ko <zzoon at igalia.com> ---
Created attachment 354993
  --> https://bugzilla.gnome.org/attachment.cgi?id=354993&action=edit
libs: display: remove GstVaapiDisplay cache

Under current cache mechanism, we could share GstVaapiDisplay safely.
But since GstContext sharing works fine, we can remove this.

In addition, the cache prevented from using multiple GstVaapiDisplay.
This has been killing performance due to lock of same display in vaapisink
if you run multiple pipelines including vaapisink.

So now, we remove GstVaapiDisplay cache.

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