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readme.md

1# SoundTouch library
2
3SoundTouch is an open-source audio processing library that allows changing the sound tempo, pitch and playback rate parameters independently from each other:
4* Change **tempo** while maintaining the original pitch
5* Change **pitch** while maintaining the original tempo
6* Change **playback rate** that affects both tempo and pitch at the
7same time
8* Change any combination of tempo/pitch/rate
9
10Visit [SoundTouch website](https://www.surina.net/soundtouch) and see the [README file](README.html) for more information and audio examples.
11
12### The latest stable release is 2.3.1
13
14## Example
15
16Use SoundStretch example app for modifying wav audio files, for example as follows:
17
18```
19soundstretch my_original_file.wav output_file.wav -tempo=+15 -pitch=-3
20```
21
22See the [README file](http://soundtouch.surina.net/README.html) for more usage examples and instructions how to build SoundTouch + SoundStretch.
23
24Ready [SoundStretch application executables](https://www.surina.net/soundtouch/download.html) are available for download for Windows and Mac OS.
25
26## Language & Platforms
27
28SoundTouch is written in C++ and compiles in virtually any platform:
29* Windows
30* Mac OS
31* Linux & Unices (including also Raspberry, Beaglebone, Yocto etc embedded Linux flavors)
32* Android
33* iOS
34* embedded systems
35
36The source code package includes dynamic library import modules for C#, Java and Pascal/Delphi languages.
37
38## License
39
40SoundTouch is released under LGPL v2.1:
41
42This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation.
43
44This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
45
46You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
47
48See [LGPL v2.1 full license text ](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html) for details.
49
50--
51
52Also commercial license free of GPL limitations available upon request
53