Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!Apple.COM!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: SoundPlay in Async mode
Message-ID: <1266@internal.Apple.COM>
Date: 10 Apr 89 19:46:33 GMT
References: <1354@ndmath.UUCP>
Sender: usenet@Apple.COM
Organization: Objects-R-Us,  Apple Computer, Inc.
Lines: 21

The Info-Mac archives should have an MPW Pascal unit that I wrote, which 
implements asynchronous SndPlay.  The main things to keep in mind:

(1) You have to create a private sound channel.  You should dispose of 
this channel as soon as you are done with it, otherwise no other program 
can make a sound.

(2) You use the channel call back feature to find out when the sound is 
finished.

(3) You have to lock down the snd resource before playing it.  The Sound 
Manager locks the resource for the duration of the SndPlay call, but when 
playing asynchronous sounds, this is a trivial length of time.

The unit I wrote does all of this stuff.

Larry Rosenstein, Apple Computer, Inc.
Object Specialist

Internet: lsr@Apple.com   UUCP: {nsc, sun}!apple!lsr
AppleLink: Rosenstein1