[Bug 734617] videodecoder: Call the child class finish() function on stream changes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=734617
  GStreamer | gst-plugins-base | git master

--- Comment #9 from Jan Schmidt <thaytan at noraisin.net> 2015-02-07 18:21:07 UTC ---
Created an attachment (id=296342)
 View: https://bugzilla.gnome.org/attachment.cgi?id=296342
 Review: https://bugzilla.gnome.org/review?bug=734617&attachment=296342

videodecoder: Add drain() vfunc

drain() is a new vfunc which does what finish() does, while
explicitly requiring the decoder be able to continue processing
data afterward.

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