[gstreamer-bugs] [Bug 519916] New: [API] add mixer-changed and options-list-changed messages

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

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  GStreamer | gst-plugins-base | Ver: HEAD CVS
           Summary: [API] add mixer-changed and options-list-changed
                    messages
           Product: GStreamer
           Version: HEAD CVS
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gst...@li...
        ReportedBy: t....@ze...
         QAContact: gst...@li...
     GNOME version: Unspecified
   GNOME milestone: Unspecified


I would like to changed message types to the current mixer changed message API,
namely:

  GST_MIXER_MESSAGE_OPTIONS_LIST_CHANGED
  GST_MIXER_MESSAGE_MIXER_CHANGED

plus associated post and parse functions (no parse for mixer-changed since
there's no additional data with that).

This is useful for mixer implementations where the mixer options list can
change over time, and/or where the entire mixer layout can change over time
(e.g. in response to an option being changed). This is the case with OSS4, for
example.

Patch with unit test and docs attached.


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