[gstreamer-bugs] [Bug 478498] New: Scale gets out of sync with hardware levels

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: HEAD CVS
           Summary: Scale gets out of sync with hardware levels
           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: hadess at hadess.net
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified


+++ This bug was initially created as a clone of Bug #478485 +++

Using the attached patch, which logs get/set on the volume, I can see that log:
** Message: set: volume 0•
** Message: get: volume 0.000000 (scale 0.000000) mute 0 1•
** Message: get: volume 0.000000 (scale 0.000000) mute 0 1•
** Message: set: volume 11•
** Message: set: volume 31•
** Message: get: volume 0.000000 (scale 100.000000) mute 0 1•
** Message: get: volume 0.000000 (scale 100.000000) mute 0 1•

(31 is the upper level of my master track mixer)

This means that the "set 11" and "set 31" failed (GstAlsa has _no_ error
checking whatsoever).


The mixer API doesn't allow for failure. Some calls to ALSA might fail, and the
volume isn't set or retrieved properly, which means that the applet's state
goes completely bonkers when changing the volume quickly (I mean really
quickly).


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