[gstreamer-bugs] [Bug 616396] New: [playbin2] might fail a duration query immediately following PAUSED state

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=616396
  GStreamer | gst-plugins-base | git

           Summary: [playbin2] might fail a duration query immediately
                    following PAUSED state
    Classification: Desktop
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: mnauw at users.sourceforge.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
      GNOME target: ---
     GNOME version: ---


Created an attachment (id=159252)
 View: https://bugzilla.gnome.org/attachment.cgi?id=159252
 Review: https://bugzilla.gnome.org/review?bug=616396&attachment=159252

Only return cached duration during group switch if there is a cached one.

playbin2 special cases duration query and provides cached duration if there is
a stream-changed message still pending (which should be posted by downstream
sinks when they receive the message event that has been sent downstream
earlier).

Consider a mainloop receiving a state change to PAUSED and then issuing a
duration query.  Then there is a race between this mainloop and the
rendering/posting of the stream-changed message.  If the former is "faster",
then playbin2 will look for a cached duration response (which can not be
present yet as all is still starting up).

Possible patch attached (though something more nifty might be possible ...)

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