[Bug 749243] New: textoverlay: gltestsrc ! textoverlay ! fakesink does not work

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749243

            Bug ID: 749243
           Summary: textoverlay: gltestsrc ! textoverlay ! fakesink does
                    not work
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas.dufresne at collabora.co.uk
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

With pipeline:

  gltestsrc ! textoverlay text=bla ! fakesink

It fails negotiation. It fails because of that condition:

  if (caps_has_meta && gst_query_find_allocation_meta (query,
            GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, NULL))
      attach = TRUE;

Basically, that checks that composition meta is both in the caps and the
allocation query, otherwise fail. I do think that if the caps OR the query says
it is supported, we should understand that it is supported.

Also, I'm not sure if the CompositionMeta existed before the caps feature was
added, but if it did, then this behaviour could be considered as a regression.
At least that would explain such a redundancy.

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