[Bug 748360] New: rtspsrc: teardown usually never happens

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=748360

            Bug ID: 748360
           Summary: rtspsrc: teardown usually never happens
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
               URL: https://bugzilla.gnome.org/show_bug.cgi?id=739265
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: vasilchukkseniia at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

https://bugzilla.gnome.org/show_bug.cgi?id=739265

I had the same situation with TEARDOWN like Aleix with bug in URL above so I
tried using progress messages. When EOS happens, I change pipeline state to
STATE_PAUSE and wait for progress messages (this works fine), after I get
GST_PROGRESS_TYPE_COMPLETE I set pipeline to STATE_READY to close connection
and wait for progress messages again, but this time I get no
PROGRESS_MESSAGE_COMPLETE.

When a state changes from PAUSE to READY I expect that CMD_CLOSE will be sent
and other commands will be canceled. But after gst_rtspsrc_thread executes
CMD_PAUSE, it changes current command to CMD_LOOP, so it will never be
interrupted and CMD_CLOSE will never be executed because CMD_CLOSE can only
interrupt CMD_PAUSE but not CMD_LOOP.

Aleix's patch (even without GST_RTSP_STREAM_LOCK/UNLOCK) solves this problem
for me so I think it should be submitted.

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