More Glitches
More Glitches
- Subject: More Glitches
- From: Ethan Funk <email@hidden>
- Date: Mon, 14 Feb 2005 13:58:48 -0700
In my eternal hunt for the source of audio glitching, I have added the following code to my project to I can get a message on each HAL output processor overload event. However, I'm not getting any messages, even through I hear glitches. Am I doing something wrong in setting up notification or is it possible that the glitches are due to something else?
Here is my code for the callback: msg is a Boolean I set to true for debugging
OSStatus HALOverloadListener(AudioDeviceID inDevice, UInt32 inChannel, Boolean isInput, AudioDevicePropertyID inPropertyID, void *inRefCon)
{
Distributor *output = (Distributor *)inRefCon;
if(msg){
output_map_ptr dp;
string dataStr = "unknown";
// find the output in the output distributer list
pthread_mutex_lock( &oMutex );
for (dp=outputMap.begin(); dp!=outputMap.end(); dp++){
if(&((*dp).second) == output)
dataStr = (*dp).first;
}
pthread_mutex_unlock( &oMutex );
// print message
fprintf(stdout, " MESSAGE: Processor Overload on %s output, bus #%ld.\n", dataStr.c_str(), inChannel);
fprintf(stdout, "ae>");
fflush(stdout);
}
return noErr;
}
Then I register the call back just before AU Initialization deep in my audio setup procedure:
// set up notification of processor overload
err = AudioDeviceAddPropertyListener(devID, 0, FALSE, kAudioDeviceProcessorOverload, HALOverloadListener, this);
if (err)
return false;
// initialize the HALoutput AU
err = AudioUnitInitialize(outHALUnit);
if (err)
return false;
There is NO error when I add the property listener. Any insight would be appreciated!
Ethan...
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