[Bug 746529] New: videoaggregator: Adding support for downstream allocation negotiation

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746529

            Bug ID: 746529
           Summary: videoaggregator: Adding support for downstream
                    allocation negotiation
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: pablo.anton at vodalys-labs.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: nicolas.dufresne at collabora.co.uk
     GNOME version: ---

Created attachment 299947
  --> https://bugzilla.gnome.org/attachment.cgi?id=299947&action=edit
[patch] Adding support for negotiating src pad bufferpool

Videoaggregator and compositor don't support right now the possibility of using
bufferpool from downstream. 

In order to do that, and therefore saving unnecessary buffer copies, it is
necessary to implement decide_allocation method that performs allocation query
to downstream element.

This patch version configures bufferpool only once, due to a reconfiguration
can provoke misbehavior of the pool.

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