Using Apple's new AudioEngine to change Pitch of AudioPlayer sound

Question

I am currently trying to get Apple\'s new audio engine working with my current audio setup. Specifically, I am trying to change the pitch with Audio Engine, which apparently is

Answer 1

You use an AVAudioPlayerNode, not an AVAudioPlayer.

engine = AVAudioEngine()
playerNode = AVAudioPlayerNode()
engine.attachNode(playerNode)

Then you can attach an AVAudioUnitTimePitch.

var mixer = engine.mainMixerNode;
auTimePitch = AVAudioUnitTimePitch()
auTimePitch.pitch = 1200 // In cents. The default value is 1.0. The range of values is -2400 to 2400
auTimePitch.rate = 2 //The default value is 1.0. The range of supported values is 1/32 to 32.0.
engine.attachNode(auTimePitch)
engine.connect(playerNode, to: auTimePitch, format: mixer.outputFormatForBus(0))
engine.connect(auTimePitch, to: mixer, format: mixer.outputFormatForBus(0))