[Bug 687975] Add API to require some events before streaming

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=687975
  GStreamer | gstreamer (core) | 1.0.0

--- Comment #1 from Olivier Crete (Tester) <olivier.crete at ocrete.ca> 2012-11-09 10:57:48 UTC ---
Created an attachment (id=228543)
 View: https://bugzilla.gnome.org/attachment.cgi?id=228543
 Review: https://bugzilla.gnome.org/review?bug=687975&attachment=228543

pad: Add required events so that the pad will reject buffers if these are
missing

Sink pads will return not-negotiated if it receives buffers without having
the required sticky events.

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