SoundClassification-startAudioEngine.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")
        }
    }