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va: Get VA display through GstContext

Víctor Manuel Jáquez Leal requested to merge vjaquez/gst-plugins-bad:va-context into master

This set of patches enables the fetching of VA display through GstContext, so users can set a custom VADisplay for the pipeline. Otherwise the first opened element will create a DRM VADisplay, as it was before.

Another patch, enables the request of the VASurfaceID from the GstBuffer when mapping with a flag similar to GST_MAP_GL

Also, an example is added, where the application creates a X11 VADisplay and a pipeline using vah264dec and appsink. When appsink receives a new sample, it is rendered using vaPutSurface in a GtkWidget area.

This MR is above !1483 (merged)

Edited by Tim-Philipp Müller

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