SoundTouch

Do you like SoundTouch? Are you using SoundTouch library in a commercial application?

Then please support the SoundTouch developing and maintaining effort by a donation!

NEW! Tempo / Pitch control tool Audioshift now available for Android mobile phones & tablets running Android OS v2.3-3.2! Click icon below for FREE install:

SoundTouch Audio Processing Library

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

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 that uses SoundTouch library for processing .wav audio files from command-line interface.

More information:

Example sound clips of each 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

Easy-to-use implementation of time-stretch, pitch-shift and sample rate transposing routines.
High-performance object-oriented C++ implementation.
Full source codes available for both the SoundTouch library and the example application.
Clear and easy-to-use programming interface via a single C++ class.
Supported audio data format : 16Bit integer or 32bit floating point PCM mono/stereo
Capable of real-time audio stream processing:
- input/output latency max. ~ 100 ms.
- Processing 44.1kHz/16bit stereo sound in realtime requires a 133 Mhz Intel Pentium processor or better.
Platform-independent implementation: The SoundTouch library can be compiled for any processor and OS platform supporting GNU C compiler (gcc) or Visual Studio, for example Win32, Linux, AIX.
Additional assembler-level and Intel-MMX instruction set optimizations for Intel x86 compatible processors (Win32 & Linux platforms), offering several times increase in the processing performance.
Compiled executable binaries available for Windows & Mac OS
Released under the GNU Lesser General Public License (LGPL) v2.1

Contact Information

See the author personal information page for contact information.

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