IETF Opus audio codec reference implementation.

The source in this directory was copied from an opus
repository checkout by running the ./update.sh script.
Any changes made to this version of the source should
be reflected in that script, e.g. by applying patch
files after the copy step.

The upstream repository is https://git.xiph.org/opus.git

The git tag/revision used was v1.1.3.
