[Bug 742875] [API] new audiovisualizer base class

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=742875
  GStreamer | gst-plugins-base | git master

Matthew Waters <ystreet00> changed:

           What    |Removed                     |Added
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                 CC|                            |ystreet00 at gmail.com

--- Comment #9 from Matthew Waters <ystreet00 at gmail.com> 2015-01-23 12:41:56 UTC ---
One other thing that should be mentioned is that the current
baseaudiovisualizer already maps the output buffer readwrite before calling the
subclass' render() function.  For GL, this essentially means downloading random
data and then (possibly) uploading it again to draw to.

One fix common to all the other base classes is to make the subclass deal with
mapping the buffer with it's (possible) special requirements.

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