[Bug 791196] alsamidisrc: unlock create function on shutdown

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791196

--- Comment #1 from Antonio Ospite <ao2 at ao2.it> ---
JFTR the alsa sequencer, and hence alsamidisrc, can be tested also with virtual
midi devices, for example executing "vkeybd" (which should use port 128:0 if
there are no other sequencer clients) and then using a pipeline like the one
below:

  GST_PLUGIN_PATH=/home/ao2/WIP/gstreamer/gst-plugins-base/build/ext/alsa/ \
  GST_DEBUG=fluiddec:6 \
  gst-launch-1.0 alsamidisrc ports=128:0 ! fluiddec ! audioconvert !
autoaudiosink

The fluiddec debug output nicely shows the silent tick messages.

So I tested the patch with this set up, and also with a physical midi device
(even though it makes no difference from the alsa point of view), and the patch
does not seem to affect normal operation.

Thanks,
   Antonio

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