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macoscore-audioiokit

OS X: respond to new audio device

I need to be notified, when a new audio device appears on OS X. I'm not sure where to start. Can Core Audio do this for me, or do I need to get down to a lower level with for instance IO Kit?

Solution

  • You can do this by observing kAudioHardwarePropertyDevices. The code looks roughly like:

    AudioObjectPropertyAddress propertyAddress = {
        .mSelector = kAudioHardwarePropertyDevices,
        .mScope = kAudioObjectPropertyScopeGlobal,
        .mElement = kAudioObjectPropertyElementMaster
    };

OSStatus result = AudioObjectAddPropertyListener(kAudioObjectSystemObject, &propertyAddress, myAudioObjectPropertyListenerProc, NULL);

    In myAudioObjectPropertyListenerProc you can determine what devices are currently available.