Apple Lossless Audio Coding

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Revision as of 10:14, 14 May 2006 by Mat (talk | contribs)
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Lossless audio coding using linear prediction with Golomb-Rice coding of the difference. Similar to FLAC, although the bitstreams are not compatible. Usually stored in an MP4 container, as a private extension since it is not part of the MPEG-4 standard.

Frame Header

Syntax Number of bits Semantics
channels 3 Number of channel -1 (Should be the same than in extradata ???)
??? 4 ???
??? 12 ???
hassize 1 the output sample number is stored in the header
wasted_bytes 2 unknow (same as flac ???)
isverbatim 1 if 1, the data is not compressed
if (hassize) {
outputsamples 32 number of samples