[Bug 684312] rtspsrc: mutex blocks going to NULL state

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=684312
  GStreamer | gst-plugins-good | 0.10.31

Aleix Conchillo Flaqué <aleix> changed:

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--- Comment #3 from Aleix Conchillo Flaqué <aleix at oblong.com> 2012-09-19 22:25:40 UTC ---
Created an attachment (id=224786)
 View: https://bugzilla.gnome.org/attachment.cgi?id=224786
 Review: https://bugzilla.gnome.org/review?bug=684312&attachment=224786

do not run commands if changing to NULL state

We have been able to reproduce this again, this time more easily. I finally
understood what's going on. We are setting the pipeline to NULL from our
application thread. The problem is that gst_rtspsrc_thread might also wanted to
try changing the state (e.g. gst_rtspsrc_play). However, as we are going to
NULL and gst_rtspsrc_stop is called inside a state change, everything blocks.

>From the commit log:

we avoid running any command if we are in the middle of a NULL state change.
NULL state change might happen in a different thread, so we don't want to
change the state from gst_rtspsrc_thread (e.g. in gst_rtspsrc_play).

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