# AudioUnitExtensionCopyComponentList(_:) Returns the component registrations for a given audio unit extension. ``` func AudioUnitExtensionCopyComponentList(_ extensionIdentifier: CFString) -> Unmanaged? ``` ## Parameters `extensionIdentifier` The bundle identifier of the audio unit extension. ## Return Value An array of component registrations. ## Discussion This function returns an array of dictionaries (one dictionary for each registration component) in the same format as described in [Audio Components](/documentation/AudioToolbox/audio-components). Release this value when you’re done with it. --- 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)