[Bug 688415] New: [textoverlay] Does not proxy the ALLOCATION query

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=688415
  GStreamer | gst-plugins-base | 1.x

           Summary: [textoverlay] Does not proxy the ALLOCATION query
    Classification: Platform
           Product: GStreamer
           Version: 1.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: thibault.saunier at collabora.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


The textoverlay element does not proxy the ALLOCATION query. It will make the
query not arrive stop at this element when an  upstream element do this query.

In the case of playbin2 for example, decoders will query allocation downstream
to use a common bufferpool, but as there is a textoverlay on the way, it will
never be able to use the pool from the sink. In the end useless memcopy happens
in the sink because of the fact that sinks usually wait for buffers that have
been allocated by its own pool (it is the case for xvimagesink and ximagesink
at least).

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