Registers a callback to receive audio unit render notifications.
- iOS 2.0+
- macOS 10.2+
- Mac Catalyst 13.0+
- tvOS 9.0+
The audio unit that you want to receive render notifications from.
The callback that you are registering.
Custom data that you want to be sent to your callback. Use this, for example, to identify the render listener.
A result code.
The registered callback function is called both before the audio unit performs its render operations (when the render flag’s pre-render bit is set) and after the audio unit has completed its render operation (the render flag’s post-render bit is set).
in parameters are treated as a two-part identifier. To remove a render listener, you must pass both these values to the