[:en]How to record speech to text and then play
First of all, add "Privacy - Microphone Usage Description" line and "Privacy - Speech Recognition Usage Description" line to Info.plist file as follows:
Then copy and past the following code to your project
//
// Speech.swift
// SpeechToText
//
// Created by Inventlinks on 15-09-2019.
// Copyright © 2019 Inventlinks. All rights reserved.
//
import UIKit
import Speech
import AVFoundation
class ViewController: UIViewController, AVAudioRecorderDelegate {
@IBOutlet weak var recordDisplay: UIButton!
@IBOutlet weak var playDisplay: UIButton!
@IBOutlet weak var textView: UITextView!
// Audio section
var file:Int = 0
var AudioPlayer:AVAudioPlayer!
var AudioSession:AVAudioSession!
var AudioRecorder:AVAudioRecorder!
// Speech to Text section
var lang: String = "en-US"
var SpeechRecognitionTask: SFSpeechRecognitionTask?
var RecognitionRequest: SFSpeechAudioBufferRecognitionRequest?
var AudioEngine = AVAudioEngine()
var SpeechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US"))
override func viewDidLoad() {
super.viewDidLoad()
// Initialize AudioSession
AudioSession = AVAudioSession.sharedInstance()
// to solve 'required condition is false: IsFormatSampleRateAndChannelCountValid(format)'
do {
try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default, options: [])
try AVAudioSession.sharedInstance().setActive(true)
} catch {
print(error)
}
// To get permission from user
AVAudioSession.sharedInstance().requestRecordPermission{(hasPermission) in
if hasPermission
{
self.textView.text = "Ready to speak?"
}
}
// To check any saved file?
if let number:Int = UserDefaults.standard.object(forKey: "recording") as? Int
{
file = number
}
// Speech to Text Section
recordDisplay.isEnabled = false
SpeechRecognizer?.delegate = self as? SFSpeechRecognizerDelegate
SpeechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: lang))
SFSpeechRecognizer.requestAuthorization { (authStatus) in
var isButtonEnabled = false
switch authStatus {
case .authorized:
isButtonEnabled = true
case .restricted:
isButtonEnabled = false
print("Restricted")
case .notDetermined:
isButtonEnabled = false
print("notdetermined")
case .denied:
isButtonEnabled = false
print("Access denied")
@unknown default: break
// ...
}
OperationQueue.main.addOperation() {
self.recordDisplay.isEnabled = isButtonEnabled
}
}
}
// Audio Section Function that gets path to directory
func getDirectory() -> URL
{
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let documentDirectory = paths[0]
return documentDirectory
}
@IBAction func englishBTN(_ sender: Any) {
lang = "en-US"
SpeechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: lang))
textView.text = "Ready to speak?"
}
@IBAction func japaneseBTN(_ sender: Any) {
lang = "ja-JP"
SpeechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: lang))
textView.text = "Ready to speak?"
}
@IBAction func recordBTN(_ sender: Any) {
// Speech To Text section
SpeechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: lang))
if AudioEngine.isRunning {
self.AudioEngine.stop()
self.RecognitionRequest?.endAudio()
} else {
startSpeechRecording()
}
startAudioRecording()
}
func startAudioRecording() {
// Audio Section: If active file saved?
if AudioRecorder == nil{
file = 1
let filename = getDirectory().appendingPathComponent("\(file).m4a")
let settings = [AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue]
// Start audio recording
do{
AudioRecorder = try AVAudioRecorder(url: filename, settings: settings)
AudioRecorder.delegate = self
AudioRecorder.record()
recordDisplay.setTitle("STOP", for: .normal)
print("recording now")
}
catch
{
showAlert(title: "Error", message: "Please try again")
}
} else{
// Stopping audio recording
AudioRecorder.stop()
AudioRecorder = nil
// To save recording
UserDefaults.standard.set(file, forKey: "recording")
recordDisplay.setTitle("Start", for: .normal)
// Starting playing
let path = getDirectory().appendingPathComponent("\(file).m4a")
print("file\(file)")
do
{
AudioPlayer = try AVAudioPlayer(contentsOf: path)
AudioPlayer.play()
// Only play once
AudioPlayer?.numberOfLoops = 0
// Set the volume of playback here.
AudioPlayer?.volume = 10.0
print("playing now")
}
catch
{
showAlert(title: "Error", message: "Please try again")
}
}
}
func startSpeechRecording() {
// Cancel the previous task if it's running.
if SpeechRecognitionTask != nil {
SpeechRecognitionTask?.cancel()
SpeechRecognitionTask = nil
}
RecognitionRequest = SFSpeechAudioBufferRecognitionRequest()
let inputNode = AudioEngine.inputNode
guard let RecognitionRequest = RecognitionRequest else {
fatalError("Error in Recognition")
}
RecognitionRequest.shouldReportPartialResults = true
SpeechRecognitionTask = SpeechRecognizer?.recognitionTask(with: RecognitionRequest, resultHandler: { (result, error) in
var FinalResult = false
if result != nil {
self.textView.text = result?.bestTranscription.formattedString
FinalResult = (result?.isFinal)!
}
if error != nil || FinalResult {
self.RecognitionRequest = nil
self.SpeechRecognitionTask = nil
self.AudioEngine.stop()
inputNode.removeTap(onBus: 0)
self.recordDisplay.isEnabled = true
}
})
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 didn't initialize")
}
}
func speechRecognizer(_ speechRecognizer: SFSpeechRecognizer, availabilityDidChange available: Bool) {
if available {
recordDisplay.isEnabled = true
} else {
recordDisplay.isEnabled = false
}
}
@IBAction func playBTN(_ sender: Any) {
let path = getDirectory().appendingPathComponent("\(file).m4a")
do
{
AudioPlayer = try AVAudioPlayer(contentsOf: path)
AudioPlayer.play()
// Only play once
AudioPlayer?.numberOfLoops = 0
// Set the volume of playback here.
AudioPlayer?.volume = 10.0
print("play button pressed now")
}
catch
{
showAlert(title: "Error", message: "Please try again")
}
}
// To display Alert Message
func showAlert(title:String, message:String)
{
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
present(alert, animated: true, completion: nil)
}
}
}
[:]
