Macintosh Audio Compression/Expansion

MACE (Macintosh Audio Compression/Expansion) is a lossy, proprietary compression scheme developed by Apple Computer for their Macintosh line of computers.

Technically, it's very similar to how ADPCM works.

It only works on 8bit streams. It offers two compression modes: 6:1 (1/6th of the original file size, 117kbps) and 3:1 (1/3rd of the original file size, 235kbps). Quality is relatively poor.

Users are encouraged not to use this codec, for several reasons:

• There are better alternatives quality-wise (ADPCM, WavPack lossy, psychoacoustic codecs)
• Proprietary codec - E.G, on Windows platform, it can only be encoded and played in QuickTime
• Won't work on bit depths other than 8bit.

External Links

• QuickTime plays and encodes MACE streams.
• Reverse engineered MACE decoder sources by Laszlo Torok