[Bug 724131] colorbalance: add colorbalance meta API

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=724131
  GStreamer | gst-plugins-base | git

Nicolas Dufresne <nicolas.dufresne> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #18 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-02-12 20:59:59 UTC ---
As a follow up, I think this would be against what is currently implemented in
playbin for this. Currently playbin will introspect the sink to check if it
supports ColorBalance interface and at least the four mandatory channels,
BRIGHTNESS, CONTRAST, HUE and SATURATION. If this is found, it will not plug a
color balance element, which is another way to solve the passthrough issue.

It requires the application or a smart element like playbin to make decision,
but it solves the problem at smaller complexity cost. Leaving as needinfo for
now, but I cannot come with argument that would let me think we should go for a
more complex mechanism.

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