I have no idea why I have this error. The error I got is
Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: _recordingTap == nil'
UPDATE
Actually, this works, but after several times, suddenly the button is disabled and the mic no longer is in action. Then it causes the error and get crashed.
Could you please help me with this?
class ViewController: UIViewController, SFSpeechRecognizerDelegate, UITextViewDelegate, AVSpeechSynthesizerDelegate {
@IBOutlet weak var myTextView: UITextView!
@IBOutlet weak var microphoneButton: UIButton!
private let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US"))!
private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
private var recognitionTask: SFSpeechRecognitionTask?
private let audioEngine = AVAudioEngine()
var rightButton = UIBarButtonItem()
override func viewDidLoad() {
super.viewDidLoad()
microphoneButton.isEnabled = false
speechRecognizer.delegate = self
speechRecognizerFunc()
myTextView.delegate = self
myTextView.isUserInteractionEnabled = false
}
@IBAction func cancelButton(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
}
func speechRecognizerFunc(){
SFSpeechRecognizer.requestAuthorization {
(authStatus) in
var isButtonEnabled = false
switch authStatus {
case .authorized:
isButtonEnabled = true
case .denied:
isButtonEnabled = false
print("User denied access to speech recognition")
case .restricted:
isButtonEnabled = false
print("Speech recognition restricted on this device")
case .notDetermined:
isButtonEnabled = false
print("Speech recognition not yet authorized")
}
OperationQueue.main.addOperation() {
self.microphoneButton.isEnabled = isButtonEnabled
}
}
}
@IBAction func microphoneTapped(_ sender: AnyObject) {
if audioEngine.isRunning {
audioEngine.stop()
recognitionRequest?.endAudio()
microphoneButton.isEnabled = false
microphoneButton.setTitle("Start", for: .normal)
myTextView.text = ""
} else {
myTextView.text = "Say something. I'm listening...."
startRecording()
microphoneButton.setTitle("Stop", for: .normal)
}
}
func startRecording() {
if recognitionTask != nil {
recognitionTask?.cancel()
recognitionTask = nil
}
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
print("audioSession properties weren't set because of an error.")
}
recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = audioEngine.inputNode else {
fatalError("Audio engine has no input node")
}
guard let recognitionRequest = recognitionRequest else {
fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")
}
recognitionRequest.shouldReportPartialResults = true
recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest, resultHandler: {
(result, error) in
var isFinal = false
if result != nil {
self.myTextView.text = result?.bestTranscription.formattedString
isFinal = (result?.isFinal)!
}
if error != nil || isFinal {
self.audioEngine.stop()
inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
self.microphoneButton.isEnabled = true
self.performSegue(withIdentifier: "nv", sender: nil)
}
})
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
print("audioEngine couldn't start because of an error.")
}
}
func speechRecognizer(_ speechRecognizer: SFSpeechRecognizer, availabilityDidChange available: Bool) {
if available {
microphoneButton.isEnabled = true
} else {
microphoneButton.isEnabled = false
}
}
func popUpAlert(title: String, msg: String){
let alert = UIAlertController(title: title, message: msg, preferredStyle: .alert)
let okay = UIAlertAction(title: "Okay", style: .default, handler: nil)
alert.addAction(okay)
self.present(alert, animated: true, completion: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "nv" {
let vc = segue.destination as! SpeechTableViewController
vc.text = self.myTextView.text
print("ViewControoler: text value: \(textValue)")
}
}
}
