Re: AudioObjectAddPropertyListener vs. AudioDevicePropertyListenerProc
Re: AudioObjectAddPropertyListener vs. AudioDevicePropertyListenerProc
- Subject: Re: AudioObjectAddPropertyListener vs. AudioDevicePropertyListenerProc
- From: Jeff Moore <email@hidden>
- Date: Thu, 19 Nov 2009 18:01:44 -0800
Your scope value is wrong. It should be kAudioObjectPropertyScopeGlobal.
From <CoreAudio/AudioHardware.h>:
@discussion The AudioSystemObject has one scope, kAudioObjectPropertyScopeGlobal, and only a
master element.
On Nov 19, 2009, at 5:51 PM, Ethan Funk wrote:
> I am replacing "AudioDevicePropertyListenerProc" in my code with "AudioObjectAddPropertyListener"
>
> The goal is to get notified when the sound hardware list changes (audio device is plugged/unplugged). The code below appears to work fine - no error after calling AudioObjectAddPropertyListener, however, my audioDevListChangedProc is not getting called when I plug/unplug a USB audio interface. Note that audioDevListChangedProc is a static c++ procedure. Almost the same code works fine with AudioDevicePropertyListenerProc, again with a static declared appropriate callback. What am I missing?
>
> AudioObjectPropertyAddress prop;
> prop.mSelector = kAudioHardwarePropertyDevices;
> prop.mScope = 0;
> prop.mElement = 0;
> err = AudioObjectAddPropertyListener(kAudioObjectSystemObject, &prop, &audioDevListChangedProc, this);
>
> Thanks,
--
Jeff Moore
Core Audio
Apple
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden