In my navigation CarPlay app I am needing to capture voice input and process that into text. Is there a built in way to do this in CarPlay?
I did not find one, so I used the following, but I am running into issues where the AVAudioSession will throw an error when I am trying to set active to false after I have captured the audio.
public func startRecording(completionHandler: @escaping (_ completion: String?) -> ()) throws {
// Cancel the previous task if it's running.
if let recognitionTask = self.recognitionTask {
recognitionTask.cancel()
self.recognitionTask = nil
}
// Configure the audio session for the app.
let audioSession = AVAudioSession.sharedInstance()
try audioSession.setCategory(.record, mode: .default, options: [.duckOthers, .interruptSpokenAudioAndMixWithOthers])
try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
let inputNode = self.audioEngine.inputNode
// Create and configure the speech recognition request.
self.recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let recognitionRequest = self.recognitionRequest else { fatalError("Unable to created a SFSpeechAudioBufferRecognitionRequest object") }
recognitionRequest.shouldReportPartialResults = true
// Keep speech recognition data on device
recognitionRequest.requiresOnDeviceRecognition = true
// Create a recognition task for the speech recognition session.
// Keep a reference to the task so that it can be canceled.
self.recognitionTask = self.speechRecognizer.recognitionTask(with: recognitionRequest) { result, error in
var isFinal = false
if let result = result {
// Update the text view with the results.
let textResult = result.bestTranscription.formattedString
isFinal = result.isFinal
let confidence = result.bestTranscription.segments[0].confidence
if confidence > 0.0 {
isFinal = true
completionHandler(textResult)
}
}
if error != nil || isFinal {
// Stop recognizing speech if there is a problem.
self.audioEngine.stop()
do {
try audioSession.setActive(false, options: .notifyOthersOnDeactivation)
} catch {
print(error)
}
inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
if error != nil {
completionHandler(nil)
}
}
}
// Configure the microphone input.
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
self.recognitionRequest?.append(buffer)
}
self.audioEngine.prepare()
try self.audioEngine.start()
}
Again, is there a build-in method to capture audio in CarPlay? If not, why would the AVAudioSession throw this error?
Error Domain=NSOSStatusErrorDomain Code=560030580 "Session deactivation failed" UserInfo={NSLocalizedDescription=Session deactivation failed}