Support Ambisonics

Timothy B. Terriberryrequested to merge
tterribe/opusfile:ambisonics3 into master

Additional review comments addressed and stereo downmixing support by Timothy B. Terriberry. Minor revisions by Felicia Lim:

  • Bump OP_NCHANNELS_MAX to 227.
  • Fail if trying to decode mapping family 3 but providing a null pointer for storing the demixing matrix and/or length.

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