[Bug 768248] vaapiencode: Add Encoding region-of-interest (ROI) support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768248

--- Comment #2 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
>From my point of view, the "gst" way of implementing this, is creating a new
GST_EVENT_CUSTOM_DOWNSTREAM (perhaps also upstream) that the application could
inject into the pipeline with gst_element_send_event().

The event will have an GstStructure named, for example
GstVaapiEncoderRegionOfInterest, with roi-x, roi-y, roi-width, roi-height, etc.

The vaapi encoders will catch this event and will configure themselves
accordingly.

That's it, from the top of my head.

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