Android binding library for SoundTouch

This library allows to use SoundTouch in real-time processing mode. It has also few Android-specific changes for SoundTouch:

1. Reduced binary size from ~300KB to 15KB per arch -> by using only features needed for processing of frames (no BPM/PeakFinder etc) you can get to ~80KB. However ~60KB is wasted by the fact that NDK by default uses c++_static STL and doesn't remove all unused symbols. SoundTouch doesn't use C++ STL (just C), so we can use system STL, but this one is deprecated, so it's better to use none STL and provide ::new and ::delete operators. This way we can get down to 15KB with few minor inconveniences.
2. Added JNI variant for put/receive methods, that can reduce overhead of calling native methods from JVM side.

Licensing

Check LICENSE.txt.

NOTICE: I am not a lawyer and this is not legal advice.

How it should work in practice for Android project -> Most of C++ files are LGPL-licensed and other files are Apache-licensed, what means that ".so" file needs to satisfy LGPL requirements (f.e. provide sources of ".so" file so user can rebuild it and replace in final product).

Because ".so" file is dynamically loaded/linked, the rest of ".apk" may keep its license, however sources of this library have to be provided/linked in the application, so user can, compile lib and replace it in ".apk".

Try it

You can check (hear) code in action, in this app: Music Speed Changer