[gstreamer-bugs] [Bug 638891] New: New QoS event encouraging degraded rendering when window is obscured

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=638891
  GStreamer | gstreamer (core) | 0.10.28

           Summary: New QoS event encouraging degraded rendering when
                    window is obscured
    Classification: Desktop
           Product: GStreamer
           Version: 0.10.28
        OS/Version: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: yongnian.le at intel.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


There might be many cases that some window is invisible 
 (for example other window is in full screen), its related sink elements are
still busy in rendering and upstream elements are busy in processing and
decoding. Here a new event type "QOS_OBSCURED" is introduced. 

The UI toolkit (Gtk+, Qt) already keeps track of windows status information:
visible or invisible etc. So it would be straightforward to extend the
GstVideoSink class to have a property that encourages degraded rendering. When
such property is set, the "QOS_OBSCURED" event is pushed to upstream elements
for handling: degraded quality for less resources. 

And, for bonus points, as there is a trend in the industry toward stream
switching for video over the internet, such event could be used to select
appropriate media info in future.

After discussion with David Schleef (ds at entropywave.com) and Halley Zhao
(halley.zhao at intel.com), the patches (based on version 0.10.28) for such
mechanism are ready for video rendering degradation when it is invisible. They
include below changes:
1. gstquark.h/gstquark.c: new quark string
2. gstevent.h/gstevent.c: new QoS event 
3. gstvideosink.c: generate new QoS event when it encourages degraded rendering
3. gsttee.c: degrade handling rate when it receives degraded rendering request

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