[music-dsp] Apple's Core Audio Format?
decoy at iki.fi
Mon Apr 18 08:03:17 EDT 2005
On 2005-04-18, Erik de Castro Lopo uttered:
> [...] The reason for the above request is that I would like to add
> support for this format to libsndfile.
Not a Mac user, and the documentation is really scarce, but the features
and support they rave about seem to suggest that Core Audio files are
simply a new QuickTime derivative. I mean, QTFF's 64-bit, it has AAC and
the like, it can seamlessly reference both raw and compressed data in
external files, and the software support exists in QT as advertised.
Apple also seems to be leveraging QTFF quite heavily now that ISO and
MPEG have adopted most of it in their Base Media File Format. So I'm
guessing CAFF is audio tracks only QTFF with a couple of new boxes for
configuration information. If so, adding support for it will be a bit
tricky from the format viewpoint (QT is deeply nested/structured while
most of the necessary encodings are already supported by libsndfile),
but then the code could be used for BMFF/MPEG-7 support as well.
Then again, this is just a guess...
Sampo Syreeni, aka decoy - mailto:decoy at iki.fi, tel:+358-50-5756111
student/math+cs/helsinki university, http://www.iki.fi/~decoy/front
openpgp: 050985C2/025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2
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