[Bug 790124] New: playbin3: NEED_CONTEXT events not propagated to app when creating sinks

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790124

            Bug ID: 790124
           Summary: playbin3: NEED_CONTEXT events not propagated to app
                    when creating sinks
    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: rawoul at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Some sinks can require an external context from the application, for example
waylandsink and glimagesink require a wayland display or gl display handle when
going from NULL to READY.

However, in playbin3 the sinks are created by playsink, which first tries to
set the element state to READY. Since the element is still orphaned at this
point, the NEED_CONTEXT messages are not propagated to the message bus, and
thus the app (or playbin) cannot reply with a proper context.

This means it is impossible to properly embed waylandsink or glimagesink in an
application using playbin3.

Note that this only seems to happen with playbin3: playbin2 creates the sink in
the autoplug-select signal, and it correctly assigns a bus handler first before
setting the sink to READY, and playsink uses the sink provided by playbin2. In
playbin3 apparently the autoplug-select signal is not used.

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