[Bug 638168] textoverlay: don't return wrong-state when stopping while in text chain

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=638168
  GStreamer | gst-plugins-base | unspecified

--- Comment #20 from Andre Moreira Magalhaes <andrunko at gmail.com> 2012-05-11 16:36:36 UTC ---
Created an attachment (id=213880)
 View: https://bugzilla.gnome.org/attachment.cgi?id=213880
 Review: https://bugzilla.gnome.org/review?bug=638168&attachment=213880

gstplaysink: Properly reset chain when receiving a custom flush event to avoid
wrong-state

Another issue was that while trying to change subtitles the gstplaysink queue
sometimes would get stuck in wrong-state. This patch attempts to fix it by
setting up a new event and chain functions to the gstplaysink text sink and
resetting the flow to FLOW_OK if we got a custom flush event from
gsttextoverlay (happens when changing streams).

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