[gstreamer-bugs] [Bug 478512] [alsamixer] volume control slider not working

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: git

Sebastian Dröge changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #127879|0                           |1
        is obsolete|                            |
 Attachment #127882|none                        |committed
               Flag|                            |
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|HEAD                        |0.10.23




------- Comment #40 from Sebastian Dröge  2009-02-10 10:02 UTC -------
commit fc23037a9aaf0beca99f9494948b2fb1169a03db
Author: Antoine Tremblay <hexa00 at gmail.com>
Date:   Tue Feb 10 11:00:12 2009 +0100

    alsamixer: Fix race condition that made alsamixer not working properly

    This is due to race conditions between functions that
    modified the mixer like set_volume and
    snd_mixer_handle_events since the handle_events
    can now be called at any time.

    Fixed by adding locking around any snd_mixer call
    since even read functions can modify the mixer stucture, since
    alsa likes to clear it's values before reading new ones.

    The favorite race condition seemed to be that set_volume
    called read_elem (in alsalib) that reset the volumes to
    0 and then read them with read_x_volume. This read looped
    on each channel and as the race condition occured the
    channels value could be anything , most of the time
    it was 0. Thus no value was read or only the value of
    one channel was and the volume was reset to 0.

    Fixes bug #478512.


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