AudioEngine.swift

    private func startAudioEngine() {
            do {
                let request = try SNClassifySoundRequest(mlModel: soundClassifier.model)
                try analyzer.add(request, withObserver: resultsObserver)
            } catch {
                print("Unable to prepare request: \(error.localizedDescription)")
                return
            }
           
            audioEngine.inputNode.installTap(onBus: 0, bufferSize: 8000, format: inputFormat) { buffer, time in
                    self.analysisQueue.async {
                        self.analyzer.analyze(buffer, atAudioFramePosition: time.sampleTime)
                    }
            }
            
            do{
            try audioEngine.start()
            }catch( _){
                print("error in starting the Audio Engin")
            }
        }
}