AVAudioEngine correct way to disconnect nodes

Question

I am confused by disconnect API of AVAudioEngine. I have the following code:

 engine.connect(engine.inputNode, to: engine.mainMixerNode, format: nil)

I now need to disconnect these two nodes. What is the corresponding statement to disconnect them?

Answer 1

Either

engine.disconnectNodeInput(engine.mainMixerNode)

or

engine.disconnectNodeOutput(engine.inputNode)

should break the connection been inputNode and mainMixerNode.