== Opus Audio Tools ==

This is opus-tools, a set of tools to encode, inspect, and decode
audio in the Opus format.

For more information on Opus see http://www.opus-codec.org/

There is basic documentation in the HTML files included in this archive.

This is the same front-end code as the opus-tools-0.1.6 release,
just compiled against the 1.1-alpha version of the opus reference
implementation.

The most important changes
are:

Quality-impacting

    Unconstrained VBR algorithm
    New transient detector
    Bitrate boost for tonal samples, which are harder to code
    Fixes to the tf analysis code
    Improvements to the hybrid mode code
    Fixed some mode switching issues
    More aggressive use of dynamic allocation
    Automatic audio bandwidth detection
    DC rejection filter

Optimizations

    Significant reduction of the decoder stack size requirement
    Optimization of several functions for the common case of zero

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These Win32 opus-tools binaries were cross-compiled with mingw from:

http://downloads.xiph.org/releases/opus/opus-tools-0.1.6.tar.gz
corrsponding to https://git.xiph.org/?p=opus-tools.git
commit: b2b46a031e21189bef1ef0d34cf49c93fd4c5ccd
tag: v0.1.6

and http://downloads.xiph.org/releases/opus/opus-1.1-alpha.tar.gz
commit: d683c76b882224cb331268438c001ac46fe8e3ab
tag: v1.1-alpha

You can verify the files with:
 sha256sum -c SHA256SUMS.txt
 gpg --verify SHA256SUMS.txt.asc

These tools are available as part of cygwin: http://www.cygwin.com/
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Please send any comments/bug reports on these tools
by email to Ralph Giles <giles@mozilla.com> and
Greg Maxwell <greg@xiph.org>.
