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

[GStreamer (bugzilla.gnome.o. <bug...@gn...>]

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

--- Comment #27 from Yongnian <yon...@in...> 2011-02-11 01:09:15 UTC ---
Thanks you! Please let me try to explain. Hope below works and makes sense, and
welcome any better solution or idea. 

The purpose of "tee" is try to duplicate source buffers and pass them down to
multiple sinks. If all sinks of tee generate "throttle" QoS event, "tee" can
push such event to upstream elemens, which might be aware of such event and
take corresponding action to reduct the buffer rate consequently.

But at most time, if only one sink of "tee" generates "throttle" QoS event, it
is not safe for "tee" to push such event to upstream elements. So "tee" needs
take care itself: namely drop some of the buffers from source to that sink
which generates "throttle" QoS event; while "tee" still needs pass down all
buffers to other sinks which don't generate "throttle" QoS event. That's the
work of the patch to "tee". 

In order to avoid the frequent variance caused by "throttle" QoS event, above
"throttle" behavior in "tee" take some delay period before invalidation,
namely (3 * throttle_time_interval). If there is no new "throttle" QoS event
from sink to renew/keep such behavior, the "tee" works as traditional mode.

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