# CMAudioDeviceClockGetAudioDevice(_:deviceUIDOut:deviceIDOut:trackingDefaultDeviceOut:) Returns the Core Audio device the clock is tracking. ``` func CMAudioDeviceClockGetAudioDevice(_ clock: CMClock, deviceUIDOut: AutoreleasingUnsafeMutablePointer?, deviceIDOut: UnsafeMutablePointer?, trackingDefaultDeviceOut: UnsafeMutablePointer?) -> OSStatus ``` ## Parameters `clock` The clock from which to retrieve its audio device. `deviceUIDOut` An optional unique device identifier. If you specify a non-`NULL` value, this function returns the `deviceUID` and its associated ID, and sets `trackingDefaultDeviceOut` to `false`. `deviceIDOut` An optional device identifier. If you specify a non-`NULL` value, this function returns a `NULL` UID and the device ID, and sets `trackingDefaultDeviceOut` to `false`. `trackingDefaultDeviceOut` On return, a Boolean value that indicates whether the audio clock tracks the default audio device. ## Return Value A value that indicates the completion status. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)