[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

--- Comment #5 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-02-11 19:12:23 UTC ---
You could do the negotiation about which channels are supported with the
allocation query with the second parameter of gst_query_add_allocation_meta().

I think in general this approach is good, but you shouldn't limit the powers of
the colorbalance interface :) Even if nobody uses anything else than the 4
channels.

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