[Bug 706441] videomixer: Rework/review the way we handle flushing

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=706441
  GStreamer | gst-plugins-good | 1.x

Sebastian Dröge (slomo) <slomo> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |slomo at circular-chaos.org
     Ever Confirmed|0                           |1

--- Comment #2 from Sebastian Dröge (slomo) <slomo at circular-chaos.org> 2013-08-21 06:58:34 UTC ---
I think this should work the following way:

1) flush-start/flush-stop received from upstream without a pending seek: Reset
the GstVideoMixer2Pad segment on flush-stop and don't forward anything
downstream. Never.

2) flush-start/flush-stop received from downstream: Reset on flush-stop and
forward upstream

3) flushing seek: Forward to all upstreams, don't send flush-start/stop
ourselves downstream. Forward the *first* flush-start and flush-stop that
happens because of the seek, drop all others. Reset the GstVideoMixer2Pad
segment when receiving the flush-stops (all of them for the corresponding pad).

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