[Bug 687975] New: 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

           Summary: Add API to require some events before streaming
    Classification: Platform
           Product: GStreamer
           Version: 1.0.0
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: olivier.crete at ocrete.ca
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


This is an experiment to allow elements to declare that they require some
sticky events before accepting buffers. The idea is to have the core (well
GstPad) just reject the buffers if the events haven't been received. This makes
writing elements easier as one can then assume that the CAPS or SEGMENT event
has been received before a buffer.

Also, we should enforce event ordering in the pads so that the caps/segment
order is guaranteed to always be the same, etc.

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