[Bug 793338] videometa: add support for encoder parameters to ROI meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793338

--- Comment #8 from Guillaume Desmottes <gdesmott at gnome.org> ---
1) Yes they can and we can use gst_buffer_iterate_meta_filtered() it iterate on
all of them.
But I'm confused with the ROI meta API actually. From its struct it's supposed
to have a 'roi_type' (its semantic, like 'face') and an opaque id (as we can
have more than one ROI of the same type on a given buffer). But in the
implementation both seems to be mixed up:
gst_buffer_add_video_region_of_interest_meta() passes the roi_type as ID, and
gst_buffer_add_video_region_of_interest_meta_id() doesn't set the id at all.
Am I missing something here or is it a bug in the API?

2) Our OMX implementation can yes.

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