[Bug 705579] New: Playbin prevents plugins requesting a GstContext to work properly

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=705579
  GStreamer | gst-plugins-base | git

           Summary: Playbin prevents plugins requesting a GstContext to
                    work properly
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: lionel.g.landwerlin at linux.intel.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When using Gstreamer-vaapi, the vaapidecode plugin instances usually need
informations about the display (is it wayland, X11 or even direct drm access?).
This works well if you're building a custom pipeline by hand, because all the
elements are linked one to another, down to the video sink (which is the
element most likely to provide display informations).

Unfortunately when using playbin/decodebin, the pipeline is built incrementally
and even though a video sink has been provided to playbin, the video sink
element is not attached to the GstBus of the pipeline when vaapidecode request
the display informations to allocate its buffers.

Would it be possible for the playbin/decodebin plugins to forward the
GST_QUERY_CONTEXT message to the video sink or to connect the video sink to
GstBus earlier in the process or creating the pipeline dynamically?

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