[gstreamer-bugs] [Bug 485753] New: Decodebin2 deadlocks when nulling pipeline during typefind

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: HEAD CVS
           Summary: Decodebin2 deadlocks when nulling pipeline during
                    typefind
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: ext-tommi.myohanen at nokia.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


Steps to reproduce the problem:
1. Set playbin with some uri to PLAYING
2. when typefind element is performing typefind, set playbin to NULL

This is what I think happens next:
* Decodebin2 takes its state_lock and starts setting its children from PAUSED
to READY 
* Typefind element won't switch to READY until it finishes its typefinding and
has emitted have_type signal
* type_found callback in decodebin2 tries to take state_lock too and pipeline
deadlocks.

I can reproduce the problem with attached test player:
$ GST_DEBUG=GST_STATES:5,typefind:5,decodebin2:5 ./dbin2-deadlock
http://replaygain.hydrogenaudio.org/ref_pink.wav 2> gst.log
Starting pipeline
Got state-changed message from play
Got clock-provide message from play
Got state-changed message from test
Got state-changed message from async-fakesink
Got state-changed message from typefind
typefind changed state to 2
Got state-changed message from decodebin20
Got state-changed message from typefind
typefind changed state to 3
Got state-changed message from source
Got state-changed message from source
Got buffer 1 with size 1171
Got buffer 2 with size 1448
Nulling pipeline

One way to fix this would be to connect/disconnect type_found callback in
READY_TO_PAUSED/PAUSED_TO_READY state changes in decodebin2.


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