[Bug 658517] New: Peer query does not work with empty GstPlaySinkVideoConvert

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=658517
  GStreamer | gstreamer (core) | git

           Summary: Peer query does not work with empty
                    GstPlaySinkVideoConvert
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=195943)
 View: https://bugzilla.gnome.org/attachment.cgi?id=195943
 Review: https://bugzilla.gnome.org/review?bug=658517&attachment=195943

Fix query for the case there is no explicit target

While trying to retrieve the vaDisplay using a custome query, I found that it
actually didn't work if the query goes across a element like an empty
GstPlaySinkVideoConvert. In this case, the element is a GstBin with two ghost
pad but no element inside. The query chain stops in
gst_proxy_pad_query_default() because the target is NULL.

The attached patch retrieves the target using gst_proxy_pad_get_internal() and
gst_pad_get_peer().

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