Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!shelby!rutgers!faatcrl!jimb
From: jimb@faatcrl.UUCP (Jim Burwell)
Newsgroups: comp.sys.amiga.programmer
Subject: Re: IFF FORM 8SVX chunk "CHAN" format?
Message-ID: <1006@faatcrl.UUCP>
Date: 18 Feb 91 06:02:15 GMT
References: <1991Feb17.183022.1@happy.colorado.edu>
Organization: FAA Technical Center, Atlantic City NJ
Lines: 42

kskelm@happy.colorado.edu writes:


>  Good day!!
> 
>   Just what is the format of a CHAN chunk, as found in an IFF 8SVX FORM?
> The value of "4" broke my hack, so I really need to know. (What values mean,
>not the chunk's size).


That CHAN hunk is something added by SunRize for Perfect Sound's stereo
recording capabilty.  Here are the defines for it:

#define RIGHT 4
#define LEFT 2
#define STEREO 6

This tells you to either play the sample over a left or right channel, or
play the sample in stereo.  If it is stereo, the sample data for the 
two channels which are to be played simultaneosly are in the BODY, left 
channel sample data followed by right channel sample data.  The left and
right samples are the same length, so dividing the sample length by
two gives you the length of both channels.  You then just read the first
half of the BODY into your left channel buffer, then the second half
into your right channel buffer.

C'ya,
Jim
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