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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.

• 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.

https://www.surina.net/soundtouch/download.html