[Bug 705555] New: [streamsynchronizer] should forward queries

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=705555
  GStreamer | gst-plugins-base | git

           Summary: [streamsynchronizer] should forward queries
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=250956)
 View: https://bugzilla.gnome.org/attachment.cgi?id=250956
 Review: https://bugzilla.gnome.org/review?bug=705555&attachment=250956

implement query handler in gststreamsynchronizer (playback)

* Steps to reproduce: on Raspberry Pi run gst-launch-1.0 playbin
uri=http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4 

* Actual result: omxh264dec does not use EGLImage because
gst_eglglessink_propose_allocation is not called

* Expected result: GST_QUERY_ALLOCATION should be forwarded to eglglessink.

I found that the fault comes from element streamsynchronizer.

See patch attached

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