How to suppress warnings generated by accessing `AVAudioEngine`'s `inputNode` on macOS

Question

I have the following test code for getting realtime microphone input on macOS:

import AVFoundation // for AVAudioEngine

class Mic
{
    public let audioEngine = AVAudioEngine()

    func startRecording() throws
    {
        print("- - -")
        let inputNode = audioEngine.inputNode
        print("- - -")

        if inputNode.inputFormat(forBus: 0).sampleRate == 0 {
            exit(0);
        }

        let recordingFormat = inputNode.outputFormat(forBus: 0)
        inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
            print( "YES! Got some samples!")
        }

        audioEngine.prepare()

        try audioEngine.start()
    }

    func stopRecording()
    {
        audioEngine.stop()
    }
}

I get output:

---

2019-07-22 16:26:36.773244+0300 realtime_mic[8111:540360] [plugin] AddInstanceForFactory: No factory registered for id F8BB1C28-BAE8-11D6-9C31-00039315CD46
2019-07-22 16:26:36.803372+0300 realtime_mic[8111:540360] HALC_ShellDriverPlugIn::Open: Can't get a pointer to the Open routine
2019-07-22 16:26:36.804020+0300 realtime_mic[8111:540360] HALC_ShellDriverPlugIn::Open: Can't get a pointer to the Open routine

---

Does this mean I'm doing something wrong?

Is it possible to prevent these warnings from displaying on the console?

Redouble

I see these warnings only in the Xcode 11 betas, it's hidden in die Xcode 10 final. Hopefully they will also go away once Xcode 11 reaches final. – Nagual

Still happening in Xcode 11.1 – Carlstrom

I got the same warnings. I didn't even use AVFoundation framework. I just used NSSound and NSSound.play() in Cocoa. – Olvan

I don't even do something with audio, only MIDI, and I also get these warnings on Xcode 12.2. My app is working fine though, so I guess you can just ignore it and it's maybe a bug of Apple. – Rosaliarosalie

i used audiotoolbox to test it if it invoke that warning. it did not. i wrote at here : #58279650 – Tremble