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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #10 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Tim-Philipp Müller from comment #9)
> Why do we need a library with public API? Could you describe the flow, how
> an app would use the API?

Let me chime in. The general idea is the application will create its own
GstVaapiDisplay (or multiple ones) and shared into the pipeline through the
GST_MESSAGE_NEED_CONTEXT message mechanism. So we need to export an API to the
user to create a GstVaapiDisplay.

As far as I understand, let to user to share only the VADisplay, by using only
libva library, is not enough because gstreamer-vaapi needs more context.

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