[Bug 743719] New: Changing bin state to NULL fails when there is a locked child which is locked

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=743719
  GStreamer | gstreamer (core) | git master

           Summary: Changing bin state to NULL fails when there is a
                    locked child which is locked
    Classification: Platform
           Product: GStreamer
           Version: git master
        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: ---


If a pipeline (or any bin) has a child which has it's state locked and it's
last transition was a failure, then the pipeline/bin transition to the NULL
state will fail. But it is my understanding that
gst_element_set_state(GST_STATE_NULL) should never fail.

I'm attaching a patch that just transforms failure into success in the locked
case if the target is READY or NULL.

Python test program:

import sys

Gst.init(sys.argv)

p = Gst.Pipeline()
p.set_state(Gst.State.PLAYING)
s = Gst.ElementFactory.make("filesrc", None)
p.add(s)
s.set_locked_state(True)
s.set_state(Gst.State.PLAYING)

print p.set_state(Gst.State.NULL)

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