[Bug 786246] New: qmlglsink: Add itemInitialized signal

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=786246

            Bug ID: 786246
           Summary: qmlglsink: Add itemInitialized signal
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: dv at pseudoterminal.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is useful for autoplay for example. With autoplay, it is necessary to wait
until the scene graph is fully set up. This signal is emitted once the QML item
node is ready. So, inside a connected slot, the pipeline's state can be set to
PLAYING to automatically start playback as soon as the QML script is loaded.

There is the sceneGraphInitialized signal, but it is not suitable for this,
since the GLVideoItem still has to get and wrap the GL context before it is
ready for playback. This is done in QtGLVideoItem::onSceneGraphInitialized().

Having a dedicated itemInitialized signal in the QML item not only makes
autoplay easier to accomplish, it is also a more futureproof solution, since it
would make refactoring of the item code easier. Suppose for example that the
initialization process is heavily changed for some reason, and the item now
becomes ready to play at some other moment compared to now. With the signal in
place, all that needs to be done is to simply move the "emit
itemInitialized();" line to wherever the initialization is finished.

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