Re: Apple Loop IFF extensions?
Re: Apple Loop IFF extensions?
- Subject: Re: Apple Loop IFF extensions?
- From: Richard Dobson <email@hidden>
- Date: Mon, 13 Oct 2003 20:25:33 +0100
Any chance Apple going publishing a, er, public document detailing such
a significant develoment? Anything to do with file formats is of
interest, indeed concern, to anyone working with soundfile formats, on
any platform, even if (like me) they don't currently own a mac and
certainly aren't privy to Panther development tools.
By way of precedent, Microsoft published the details of
WAVEFORMATEXTENSIBLE well before software that knew about it was
generally available.
Richard Dobson
James McCartney wrote:
on the subject of AIFF chunks:
In Panther, CoreAudio defines a new chunk type 'CHAN' which contains an
AudioChannelLayout struct that describes the channel layout of a file.
This is how CoreAudio and later QuickTime will describe multichannel
files in a flexible and unambiguous manner.
The structs are defined in <CoreAudio/CoreAudioTypes.h>. There are
functions in <AudioToolbox/AudioFile.h> to get and set these structs in
AIFF files. There are functions to manipulate these structs in
<AudioToolbox/AudioFormat.h> .
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