Core Audio Format

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Core Audio Format
Filename extension .caf
Internet media type audio/x-caf
Type code caff
Uniform Type Identifier (UTI)
Developed by Apple Inc.
Initial release 2005
Type of format media container
Container for digital audio
Website Apple Core Audio Format Specification 1.0

The Core Audio Format is a container for storing audio, developed by Apple Inc.. It is compatible with Mac OS X 10.4 and higher; Mac OS X 10.3 needs QuickTime 7 to be installed.[1]

Core Audio Format is designed to overcome limitations of older digital audio formats, including AIFF and WAV. Just like the QuickTime .mov container, a .caf container can contain many different audio formats, metadata tracks, and much more data. Not limited to a 4 GB file size like older digital audio formats, a single .caf file can theoretically save hundreds of years of recorded audio due to its use of 64-bit file offsets.[2]

Soundtrack Pro and Logic Studio use the .caf format extensively for their loop and sound effects library, particularly for surround-sound audio compressed with the Apple Lossless codec.


  1. ^ "How to Convert CAF to MP3". TechiSky. August 25, 2012. Retrieved 2012-11-27. 
  2. ^ "Apple Core Audio Format Specification 1.0/ CAF File Overview". Mac Developer Library. Apple Inc. 2011 [2005]. Retrieved 2012-11-27. 

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