AudioQueuePropertyListenerProc

Declaration

typealias AudioQueuePropertyListenerProc = (UnsafeMutableRawPointer?, AudioQueueRef, AudioQueuePropertyID) -> Void

Parameters

• inUserData:

  The custom data you’ve specified in the inUserData parameter of the Audioqueueaddpropertylistener(_:_:_:_:) function.

• inAQ:

  The recording or playback audio queue that invoked the callback.

• inID:

  The ID of the property whose value changes you want to observe.

Discussion

If you name your callback function MyAudioQueuePropertyListenerProc, you would declare it like this:

Discussion

Install this callback in an audio queue by calling the AudioQueueAddPropertyListener(_:_:_:_:) function. For example, say you want your application to be notified, after you call the AudioQueueStop(_:_:) function with the inImmedate parameter set to false, that audio has finished playing. Perform these steps:

1. Define this property listener callback function to listen for changes to the kAudioQueueProperty_IsRunning property.

2. Install this callback, using the AudioQueueAddPropertyListener(_:_:_:_:) function, in the playback audio queue that you want to monitor.

See Also

Callbacks

• AudioQueueInputCallback
• AudioQueueOutputCallback