Support Ambisonics

Timothy B. Terriberry requested to merge tterribe/opusfile:ambisonics5 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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