The Apple Lossless Audio Codec (ALAC) is an audio codec developed by Apple and
supported on iPhone, iPad, most iPods, Mac and iTunes. ALAC is a data
compression method which reduces the size of audio files with no loss of
information. A decoded ALAC stream is bit-for-bit identical to the original
uncompressed audio file.

The Apple Lossless Audio Codec project contains the sources for the ALAC
encoder and decoder. Also included is an example command line utility, called
alacconvert, to read and write audio data to/from Core Audio Format (CAF) and
WAVE files.

WWW: https://github.com/mikebrady/alac