This is Open Source implementation of Audio Processing Technology codec (aptX) originally derived from ffmpeg 4.0 project and licensed under GPLv3+.
I converted https://github.com/pali/libopenaptx to an Arduino Library
For Arduino, you can download the library as zip and call include Library -> zip library. Or you can git clone this project into the Arduino libraries folder e.g. with
cd ~/Documents/Arduino/libraries
git clone https://github.com/pschatzmann/arduino-libopenapt.git
This has the advantage that you can easily get the latest code updates by just executing the command git pull
I recommend to use this library together with my Arduino Audio Tools. This is just one of many codecs that I have collected so far: Further details can be found in the Encoding and Decoding Wiki of the Audio Tools.
Please read the license information of the orignal project