[Bug 664290] New: [0.11] Add event/query for buffering requirements

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=664290
  GStreamer | gstreamer (core) | 0.11.x

           Summary: [0.11] Add event/query for buffering requirements
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
                CC: t.i.m at zen.co.uk, wim.taymans at gmail.com
     GNOME version: ---


There should be some way to query downstream and/or upstream about the number
of buffers (or the time or number of bytes) it is going to buffer. This is
necessary to get the minimum number of buffers required to pre-allocate for
things like OpenMAX or V4L2 before playback starts to make sure that enough
buffers are allocated and the pipeline never runs out of buffers.

It could be implemented similar to the LATENCY event/query. Elements would
first query the other side, then add their own buffering requirements on top of
that and return that value.

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