Code snippets showing how to get ambisonic playback working, however head rotation doesn't work.

AmbisonicPlayback

private let AmbiPlayerNode = AVAudioPlayerNode()

...

func playAmbiAudio()
    {
        guard let AmbiFileURL = Bundle.main.url(forResource: "crowdAmbiOut", withExtension: "wav")
        else{
            print("read ambi failed")
            return
        }
        
        let file = try! AVAudioFile(forReading: AmbiFileURL)
        let layout = AVAudioChannelLayout(layoutTag: kAudioChannelLayoutTag_Ambisonic_B_Format)
        let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: 44100, interleaved: false, channelLayout: (layout)!)
        guard let buffer = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: UInt32(file.length)) else
        {
            print("buffer failed")
            return
        }
        try! file.read(into: buffer)
        engine.attach(AmbiPlayerNode)
        engine.connect(AmbiPlayerNode, to: environment, format: file.processingFormat)
        
        AmbiPlayerNode.scheduleBuffer(buffer, at: nil, options: .loops, completionHandler: nil)
        
        AmbiPlayerNode.sourceMode = .ambienceBed
        AmbiPlayerNode.play()
    }