[Bug 757152] opus: Add proper multichannel support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=757152

--- Comment #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
See https://tools.ietf.org/html/draft-terriberry-oggopus-01#section-5.1.1

The same terminology is used in the other container mappings, and also for the
opus_multistream_surround_encoder_*() API.


It basically tells you: If you have N channels, this is the position and order
of them. Currently defined is RTP (family 0) which only allows mono and stereo,
and Vorbis (family 1) which allows 1-8 channels.


Note that this is independent of the number of streams and number of coupled
streams in the OpusHead (and as passed to the decoder/encoder). The number of
streams / coupled streams is just information for the codec about how the N
channels are represented internally.

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