- iOS 9.0+
- macOS 10.11+
- Mac Catalyst 13.0+
- tvOS 9.0+
A version 3 audio unit may subclass the
AUAudio class. If so, the audio unit’s component description should refer to a registered component with a version 2 implementation by using a factory function. The bridge will instantiate the version 2 audio unit via the factory function and communicate with it using version 2 audio unit APIs.
Hosts should not access this class; it will be instantiated if needed when creating an audio unit.