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opusfile version 0.11

The opusfile and opusurl libraries provide a high-level API for
decoding and seeking within .opus files on disk or over http(s).

opusfile depends on libopus and libogg.
opusurl depends on opusfile and openssl.

Changes since the v0.10 release:
 - Fix two potential integer overflows.
   (These were not security-critical unless the compiler took the opportunity
   provided by the undefined behavior to format your hard drive.)
 - Allow JPEGs in METADATA_BLOCK_PICTURE tags to include EXIF data.
 - A few warning fixes for gcc 8.
 - Make opus_tags_copy return OP_EFAULT on failure instead of returning success.
 - Various integration and testing environment improvements.

This release is backward-compatible with the previous
release. We recommend all users upgrade.

The library is functional, but there are likely issues
we didn't find in our own testing. Please give feedback
in #opus on irc.freenode.net or at opus@xiph.org.

Programming documentation is available in tree and online
at https://opus-codec.org/docs/