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Update CHANGELOG for v3.1

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Chris Cannam
2022-09-27 08:48:09 +01:00
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CHANGELOG
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Changes in Rubber Band v3.1
This significant release contains many enhancements that can improve
performance, as well as a number of bug fixes.
* Add support for "short window" mode, OptionWindowShort, to the new
R3 processing engine. This option previously only took effect with
the R2 engine. When used with R3 it disables the R3 multi-window
logic while retaining R3's signal analysis, yielding output with
some of the quality advantages of R3 (especially for non-percussive
content) but with far lower CPU usage and processing delay.
* Implement OptionPitchHighSpeed in the R3 engine. Previously it
always used OptionPitchHighConsistency internally. In this mode
pitch-shifting upwards becomes much faster, at the expense of some
output quality. (However OptionPitchHighConsistency is still always
necessary to avoid artifacts when performing dynamic pitch changes.)
* Add support for the SLEEF library (libsleefdft) for FFTs. In
our tests this library approaches the performance of vDSP and IPP
and improves on the other supported options.
* Add support for external Speex library (libspeexdsp) for
resampling. This is a very fast resampler, significantly improved
over the older Speex code that has historically been bundled with
Rubber Band. It may still introduce a little more audible noise on
ratio changes than the built-in resampler.
* Update the R2 engine so that it always restores vertical phase
coherence gradually when returning to a ratio of 1.0 rather than
waiting for silence or a transient (as R3 also does).
* Update R3 to properly support all sample rates between 8000 and
192000 Hz.
* Remove support for libresample. This integration has not been
exercised in many years and other resamplers are better options.
* Fix several bugs, including a crash when run with very low sample
rates.
The API is unchanged from 3.0 and the library is binary compatible
back to version 1.7.
Changes in Rubber Band v3.0.0
* Introduce a new processing engine, the R3 (Finer) engine, which