apple speech api just recognize for long time - ios

Question

I am using Apple speech to recognize voice for one hour but Apple speech just recognize the voice one minute.
I read that I can make more the one request to recognize the voice more than one minute, but I don't know how.
here is my code
import UIKit
import Speech
public class ViewController: UIViewController, SFSpeechRecognizerDelegate {
// MARK: Properties
private let speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: "ar_SA"))!
private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
private var recognitionTask: SFSpeechRecognitionTask?
private let audioEngine = AVAudioEngine()
#IBOutlet var textView : UITextView!
#IBOutlet var recordButton : UIButton!
var inString = ""
public override func viewDidLoad() {
super.viewDidLoad()
speechRecognizer.delegate = self
SFSpeechRecognizer.requestAuthorization { authStatus in
/*
The callback may not be called on the main thread. Add an
operation to the main queue to update the record button's state.
*/
OperationQueue.main.addOperation {
switch authStatus {
case .authorized:
print("Dalal")
case .denied:
print("Dalal2")
case .restricted:
print("Dalal3")
case .notDetermined:
print("Dalal4")
}
}
}
// Disable the record buttons until authorization has been granted.
try! startRecording()
}
private func startRecording() throws {
// Cancel the previous task if it's running.
if let recognitionTask = recognitionTask {
recognitionTask.cancel()
self.recognitionTask = nil
}
let audioSession = AVAudioSession.sharedInstance()
try audioSession.setCategory(AVAudioSessionCategoryRecord)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = audioEngine.inputNode else { fatalError("Audio engine has no input node") }
guard let recognitionRequest = recognitionRequest else { fatalError("Unable to created a SFSpeechAudioBufferRecognitionRequest object") }
// Configure request so that results are returned before audio recording is finished
recognitionRequest.shouldReportPartialResults = true
// A recognition task represents a speech recognition session.
// We keep a reference to the task so that it can be cancelled.
recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest) { result, error in
var isFinal = false
let fileName = "Test"
let dir = try? FileManager.default.url(for: .documentDirectory,
in: .userDomainMask, appropriateFor: nil, create: true)
// If the directory was found, we write a file to it and read it back
if let fileURL = dir?.appendingPathComponent(fileName).appendingPathExtension("txt") {
// Write to the file named Test
do {
if let result = result {
self.textView.text = result.bestTranscription.formattedString
isFinal = result.isFinal
}
try self.textView.text.write(to: fileURL, atomically: true, encoding: .utf8)
} catch {
print("Failed writing to URL: \(fileURL), Error: " + error.localizedDescription)
}
if error != nil || isFinal {
self.audioEngine.stop()
// self.addp()
inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
}
do {
self.inString = try String(contentsOf: fileURL)
} catch {
print("Failed reading from URL: \(fileURL), Error: " + error.localizedDescription)
}
print("Read from the file: \(self.inString)")
}
}
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
try audioEngine.start()
textView.text = "(listening)"
}
public func speechRecognizer(_ speechRecognizer: SFSpeechRecognizer, availabilityDidChange available: Bool) {
print("any text")
}
}//end class
any suggestions or help ?
thank you.