SoundTouch

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SoundTouch Audio Processing Library

Update: SoundTouch source code repository moved to codeberg.org

The latest stable release is 2.3.1 released on 7-September-2021. See README for release details and what's new in this release.

About the SoundTouch library

SoundTouch is an open-source audio processing library for changing the Tempo, Pitch and Playback Rates of audio streams or audio files. The library additionally supports estimating stable beats-per-minute rates for audio tracks.

Tempo (time stretch): Changes the sound to play at faster or slower tempo than originally without affecting the sound pitch.
Pitch (key) : Changes the sound pitch or key while keeping the original tempo (speed).
Playback Rate : Changes both tempo and pitch together as if a vinyl disc was played at different RPM rate.

The SoundTouch library is intended for application developers writing sound processing tools that require tempo/pitch control functionality, or just for playing around with the sound effects.

The SoundTouch library source kit includes also an example utility SoundStretch for processing .wav audio files from command-line interface.

Access the source codes in codeberg.org or download the compiled executables.

More information:

Example sound clips of each tempo/pitch/rate control mode
List of applications that use SoundTouch library
Frequently Asked Questions
Theory behind how SoundTouch works - read tutorial on audio time/pitch scaling basics

SoundTouch library Features

Open-source implementation
Supports any processor and OS platform with GNU C compiler (gcc) or Visual C++: Windows, Mac OS, Linux & other *nixes, Raspberry Pi, Android, Apple iOS...
Support 16bit integer and 32bit floating point mono/stereo/multi-channel audio formats
Real-time audio processing possible:
- input/output stream latency max. ~ 100 ms
- Real-tome processing of CD quality stereo sound possible with a 133 Mhz Intel Pentium processor or better ;-)
Easy programming interface via a single C++ class
C++, C# and Java example applications
API interface modules for calling SoundTouch library routines from C#, Pascal/Delphi and Java
C++ implementation with MMX & SSE instruction set optimizations for x86 processors and OpenMP optimization for generic multi-core CPUs.
Licensed under the GNU Lesser General Public License (LGPL) v2.1. Commercial Non-LGPL license alternative available upon request.

Contact Information

Author contact information.

SoundTouch WWW page: https://www.surina.net/soundtouch