Htykuut

I have implemented speech recognition to operate app on command basis.

But as user try to start-end speech recognition continuously for few time(less then 1 min), app crashing with error message:- libc++abi.dylib: terminating with uncaught exception of type NSException

App is crashing only when user is doing this very fast.

If trying normally start-end, its working fine.

Not able to figure out the reason.

**

• Code snippet:-

**

Start Speech :-
/// Start voice recognition

*



func startListening() {



   if AVAudioSession.sharedInstance().category == AVAudioSessionCategorySoloAmbient

    {

            let audioSession = AVAudioSession.sharedInstance()

            do {

                try audioSession.setCategory(AVAudioSessionCategoryRecord)

                try audioSession.setMode(AVAudioSessionModeMeasurement)

                try audioSession.setActive(true, with: .notifyOthersOnDeactivation)

            } catch {

                print("audioSession properties weren't set because of an error.")

            }

        }



            audioEngine = AVAudioEngine()



            if !(audioEngine?.isRunning)! {

                startRecording()

                //print("start listening............")

            }

        }

*

/// Start recording/listening

private func startRecording() {

    guard let audio_engine = self.audioEngine else {return}



    if recognitionTask != nil {

        recognitionTask?.cancel()

        recognitionTask = nil

    }



    recognitionRequest = SFSpeechAudioBufferRecognitionRequest()

    let inputNode = audio_engine.inputNode





    guard let recognitionRequest = recognitionRequest else {

       // fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")

        print("fatalError : Unable to create an SFSpeechAudioBufferRecognitionRequest object")

        return



    }

    recognitionRequest.shouldReportPartialResults = true

    recognitionTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in

        var isFinal = false

        if result != nil {

            if let transcript = result?.bestTranscription.formattedString{

                self.speechResponse!(transcript,.authorized,nil)

            }

            isFinal = (result?.isFinal)!

        }

        if error != nil || isFinal {

            audio_engine.stop()

            inputNode.removeTap(onBus: 0)

            self.recognitionRequest = nil

            self.recognitionTask = nil

            if self.isContinueListening == true{

                self.startRecording()

            }

        }

    })



    let recordingFormat = inputNode.outputFormat(forBus: 0)

    inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in

        self.recognitionRequest?.append(buffer)

    }

    audio_engine.prepare()

    do {

        try audio_engine.start()

    } catch {

        print("audioEngine couldn't start because of an error")

    }



}

Stop Speech recognition:-
/// End voice recognition

func endListening() {

   if AVAudioSession.sharedInstance().category != AVAudioSessionCategorySoloAmbient{

            try? AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategorySoloAmbient )

            try? AVAudioSession.sharedInstance().setActive(true)

        }

    if (audioEngine?.isRunning ?? false) {

        audioEngine?.stop()

        recognitionRequest?.endAudio()

        if recognitionTask != nil {

            recognitionTask?.cancel()

            recognitionTask = nil

        }

        recognitionRequest = nil

        audioEngine = nil

       // print("end listening............")

    }

}

Even try to put some delay but no luck

Thanks in advance!