[Bug 732558] New: gstqueue: ignore not-negotiated if a reconfigure is pending

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732558
  GStreamer | gstreamer (core) | 1.3.3

           Summary: gstqueue: ignore not-negotiated if a reconfigure is
                    pending
    Classification: Platform
           Product: GStreamer
           Version: 1.3.3
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: mparisdiaz at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


This commit avoids NOT_NEGOTIATED error when the queue pushes a stored buffer
after sink element needs a reconfigure.

Pushing the buffer provokes sending sticky events, where one of them is the
event with the old caps, and if they are not compatible with the new ones
allowed by the sink, GST_FLOW_NOT_NEGOTIATED is returned.
Queue should ignore this error if the src pad needs to be reconfigured (as
basesrc does), so it also has to manage RECONFIGURE flag in this pad, clearing
it when a CAPS event is pushed by the queue's thread.

Based on commit 5c0e02c79c88f8dddcf9b93bd9f30d75c24ac82e
See https://bugzilla.gnome.org/show_bug.cgi?id=681198

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