freeverb-rs

A Rust implementation of the Freeverb algorithm.

About Freeverb

Freeverb was originally written in C++ by "Jezar at Dreampoint", and was released into the public domain in June 2000. It is now widely used in various incarnations in multiple software packages.

• Analysis of the Freeverb algorithm
• More information and a link to original C++ source

About freeverb-rs

This implementation of Freeverb in Rust is an almost direct conversion of the original source, created as a demonstration project for a talk I gave about Rust at the Audio Developer Conference 2018. The code has been updated since then, so if you want to follow along with the talk then take a look at the adc-2018 branch.

There are a couple of (intentional) differences to the original implementation:

• delay line buffers are dynamically allocated for simplicity. This may have a performance impact, and once generic constants are available I would like to make the buffer static.
• 64 bit processing is used internally whereas the original is 32 bit. I might make the sample type configurable at some point, but for now 64 bit processing seemed like a sensible default.

Repo structure

src/freeverb/

This contains the core implementation of Freeverb, with a simple interface.

src/audio_module

This contains a (very) experimental generic module+parameter library, which I really only added as an excuse to explore approaches to polymorphism. The audio_module approach is currently only used by app_gtk, it might go away in the future, or maybe I'll decide I like it and continue to work on it. At this point I don't know!

src/freeverb_module

The freeverb processor wrapped up as an AudioModule, currently only used by app_gtk.

src/clib

A static library that provides C bindings to the freeverb::Freeverb processor, used by app_juce.

examples/app_gtk

A very basic audio+GUI application that runs the freeverb::Freeverb processor.

You will need gtk installed on your system for this to work.

examples/app_juce

A very basic JUCE application that runs the freeverb::Freeverb processor via a statically linked library.

examples/wasm

A library that provides a wasm-bindgen interface to the freeverb::Freeverb processor.

Also in the folder is a small web application that runs the wasm processor.