Created
December 16, 2017 05:20
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This GIST is for converting Speech To Text.
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import Foundation | |
import Speech | |
protocol SpeechToTextDelegate { | |
func conversionGoingOn(_ convertedString: String) | |
func conversionFinished(_ convertedString: String) | |
} | |
class SpeechToText: NSObject, SFSpeechRecognizerDelegate { | |
// Creating singleton | |
static let sharedIntance = SpeechToText() | |
private override init() { | |
super.init() | |
speechRecognizer?.delegate = self | |
getPermissionForSpeechRecognition() | |
} | |
var delegateSpeechToText: SpeechToTextDelegate? | |
// This is the speech recognizer | |
let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US")) | |
// This is a Request | |
var regRequest: SFSpeechAudioBufferRecognitionRequest? | |
var regTask: SFSpeechRecognitionTask? | |
let avEngine = AVAudioEngine() | |
var speechText = String() | |
var timer: Timer? | |
// Method for stop recognition | |
func stopRecognition() { | |
avEngine.stop() | |
regRequest?.endAudio() | |
avEngine.inputNode?.removeTap(onBus: 0) | |
speechText = "" | |
timer?.invalidate() | |
regRequest = nil | |
regTask = nil | |
} | |
// Method for starting recognition | |
func startRecognition() { | |
//Cancel task if already running | |
if regTask != nil { | |
regTask?.cancel() | |
regTask = nil | |
} | |
//Create and AVAudioSession for audio recording | |
let avAudioSession = AVAudioSession.sharedInstance() | |
do { | |
try avAudioSession.setCategory(AVAudioSessionCategoryRecord) | |
try avAudioSession.setMode(AVAudioSessionModeMeasurement) | |
try avAudioSession.setActive(true, with: .notifyOthersOnDeactivation) | |
} catch { | |
print("Audio Session is not active") | |
} | |
//Check the Audio input. | |
guard let inputEngineNode = avEngine.inputNode else { | |
fatalError("Some Error") | |
} | |
regRequest = SFSpeechAudioBufferRecognitionRequest() | |
guard let recognitionRequest = regRequest else { | |
fatalError("SFSpeechAudioBufferRecognitionRequest object is not created") | |
} | |
recognitionRequest.shouldReportPartialResults = true | |
//Start task of speech recognition | |
regTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in | |
if result != nil { | |
DispatchQueue.main.async { | |
self.timer?.invalidate() | |
self.timer = nil | |
self.timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(SpeechToText.timerStopped), userInfo: nil, repeats: false) | |
self.speechText = (result?.bestTranscription.formattedString)! | |
self.delegateSpeechToText?.conversionGoingOn(self.speechText) | |
} | |
} | |
}) | |
//Set Formation of Audio Input | |
inputEngineNode.removeTap(onBus: 0) | |
let recordingFormat = inputEngineNode.outputFormat(forBus: 0) | |
inputEngineNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in | |
self.regRequest?.append(buffer) | |
} | |
avEngine.prepare() | |
do { | |
try avEngine.start() | |
} catch { | |
print("some error") | |
} | |
} | |
// When conversation stops | |
func timerStopped() { | |
delegateSpeechToText?.conversionFinished(self.speechText) | |
stopRecognition() | |
} | |
} |
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