Apple Core Audio Format

• Extension: caf
• Specification: http://developer.apple.com/documentation/MusicAudio/Reference/CAFSpec/index.html (mirrored PDF)
• Samples: http://samples.mplayerhq.hu/A-codecs/caf/

The Apple Core Audio Format is a flexible and extensible audio-only container format that is designed to replace other general-purpose audio formats such as WAV and AIFF.