[opus] [PATCH] Support for Ambisonics and Projection API.

[Drew Allen]

Hello all,

Attached are patches for libopusenc, opusfile and opus-tools in order to
provide support for Ambisonics and the Projection API for encoding/decoding
channel mapping 253 and 254.

Please feel free to ask any questions or give any feedback you might have.
:)

Cheers,
Drew
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