[opus] [Patch] Non-diegetic support for channel mapping 254

[Drew Allen]

Hello all,

Attached is a proposed patch for Opus that allows support for encoding
non-diegetic stereo audio as a coupled stream for use with channel mapping
254. It also rejects channel counts that are not (n+1)^2 + 2j, where n is 0
to 14 and j is either 0 or 1 (See IETF public draft doc attached for
clarification).

Please let me know any suggestions / concerns / comments.

Thank you for your time,

Cheers,
Drew Allen (from the Chrome Media Audio team)
IRC (#opus): llama_of_bits
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