Re: NSSound dropouts with Leopard on a G5
Re: NSSound dropouts with Leopard on a G5
- Subject: Re: NSSound dropouts with Leopard on a G5
- From: Jens Alfke <email@hidden>
- Date: Fri, 9 May 2008 12:27:51 -0700
On 9 May '08, at 12:10 PM, Jonathan Hendry wrote:
We have an experiment-running program which uses NSSound to play
auditory stimuli. After upgrading a G5 to Leopard, we're seeing
significant audio problems that we didn't see on Tiger. Sometimes,
it's just a momentary dropout, but other times the audio just goes
away for minutes at a time.
Does any other audio played by other apps on that machine have similar
problems?
Most of the audio glitches are accompanied by syslog messages from
IOAudioStream, describing problems related to clipIfNecessary()
Has anyone run into this? Is there a fix or workaround? Should we be
using something lower-level than NSSound? Is there a better place to
ask?
I'm not aware of any bugs specific to NSSound.
If you want to try another API, QTKit is probably the best one to try
next. Load the audio file into a QTMovie object and then tell it to
play. (You don't need any controller view.)
The low-level API that really does all the audio work is CoreAudio,
but you don't want to go there for a simple task like this. Playing a
sound file would end up as several pages of code. There are sample
apps that demonstrate how to do it, but it's still probably overkill.
On the other hand, if you want to find expert advice on this problem,
the coreaudio-api list is probably the right place to ask.
—Jens
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