[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
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                 CC|                            |nicolas.dufresne at collabora.
                   |                            |co.uk

--- Comment #1 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-02-11 17:06:56 UTC ---
I'm not sure this is the right design, or at least it does not seem coherent
with GstColorBalance interface. ColorBalance, suggest that an element can have
an arbitrary amount of Channels that can be controlled. Base on that, if an
element wants to offload it's work to downstream it should negotiate the
required channels. This negotiation could be made dynamic, in a way that if
downstream support only hue, and only hue is set to non default, then we would
still do passthrough. But at soon as "unsupported" brightness gets set, then it
will use software path (if allocation permits it, e.g. system memory and known
color format).

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