Soundtrack AIFF extensions & compatibility
Soundtrack AIFF extensions & compatibility
- Subject: Soundtrack AIFF extensions & compatibility
- From: Christopher Corbell <email@hidden>
- Date: Mon, 1 Dec 2003 14:11:38 -0800
I'm new to the list and don't see an archive listed
at search.lists.apple.com, apologies if this has been
covered before...
I'm working on two apps that I'd like to make highly
compatible with Soundtrack. Both will output AIFF files
that can be used as Soundtrack loops; one will also
permit editing of AIFF files and I'd like to preserve
as much Soundtrack metadata as possible if the files
have already been processed with the Loop Utility,
added to Soundtrack catalog etc.
I'm wondering if it's possible (either publicly or through
dts) to get more information on Soundtrack's extensions
to AIFF. In scanning a Soundtrack loop AIFF I see
several undocumented chunks, such as 'trns', 'cate', 'basc'.
These aren't wrapped in an 'APPL' section - I'm
not sure if this means they're general extensions
to AIFF that will be documented, or if it just means
that nobody really uses the 'APPL' chunk...
Is any information available at this level? Also are
other AIFF mechanisms honored by Soundtrack, e.g. if
my app is rendering a MIDI sequence to AIFF and knows
where the beats are, can I use marker chunks to give
Soundtrack a hint on beat locations, or does Soundtrack
only look at the publicly undocumented 'trns' chunk?
FWIW the apps involved are iPiano, to which I'm adding
improved AIFF export including loop-segement export with
sequences using any SoundFont/DLS bank sounds, and a
new Cocoa AudioUnit-host/audio-editor that's in early
stages of development.
Thanks for any info,
Chris
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