[gstreamer-bugs] [Bug 528060] Removing a mixer device does not remove it from gnome-sound-properties

[GStreamer (bugzilla.gnome.org) <bug...@bu...>]

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  GStreamer | gst-plugins-base | Ver: 0.10.x

Tim-Philipp Müller changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t....@ze...
             Status|UNCONFIRMED                 |NEEDINFO




------- Comment #4 from Tim-Philipp Müller  2008-04-16 19:44 UTC -------
I see the problem, but I'm not really sure if this falls into GStreamer's
domain. I don't see us implementing what would basically amount to a hal-light,
so the only thing we could do is poll regularly for changes.

Anyway, I can think of at least two other possible solutions to this:

 (a) when you get the mixers via gst_audio_default_registry_mixer_filter(),
     they are in READY state. I presume you set the mixers not currently
     selected back to NULL state, otherwise the rmmod would probably fail.
     So what you could now is just set up a timer which tries to set all
     mixers (or only the unselected ones?) to READY state and back to NULL
     every few seconds. If you can't set a mixer to ready state, the device
     has probably disappeared and you can remove it from the list or
     re-build the device list. That doesn't get you any new devices added
     to the system of course.

 (b) there's a hal plugin in gst-plugins-good (halaudiosink etc.). You could
     add a haldevicemonitor element or so which your application could create.
     When set to READY state the element could create a watcher thread with
     a main context + main loop and watch for changes in audio devices, and
     post element messages on the bus, which the application could intercept.

Any better ideas?


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