Speech Recognition got an error on iOS

Question

I'm studying the Speech Recognition on the iOS, but Every time I call the method [_recognitionRequest endAudio] , it always got an error in recognitionTaskWithRequest: the message is in the bottom.

-(void) stopRecording {
if (_disableSpeechSW == YES) {
    return;
}
if (_isAuthorization == NO) {
    return;
}

NSLog(@"stopRecording");

if ([_audioEngine isRunning]) {
    [_audioEngine stop];
    [_recognitionRequest endAudio];
}

}

-(void) startRecording {
..........
[_speechRecognizer recognitionTaskWithRequest:_recognitionRequest
                   resultHandler:^(SFSpeechRecognitionResult *result,NSError *error){
  if (error != nil ) {
     NSLog(@"%@",[error description]);
  }
  else {
   ..........
  }
}];}

[Utility] +[AFAggregator logDictationFailedWithError:] Error Domain=kAFAssistantErrorDomain Code=203 "Retry" UserInfo={NSLocalizedDescription=Retry, NSUnderlyingError=0x17424c690 {Error Domain=SiriSpeechErrorDomain Code=1 "(null)"}}

Sikorski

Hey @Martylin, you should accept the correct answer so other people with the same problem can see which answer was useful. Please read this help topic on what to do when someone answers your question. Please also go through your other questions as none are accepted. – Slugabed

The Code=203 "Retry" is not really an error error. It helps to identify when the recognizer did finish and not detect any result. – Excretion

Answer 1

For more clarification about siri speech limitation see this post: Speech Recognition Limits for iOS 10

Use my function below to stop speech recognization. Hope its works.

-(void)stopRecording{

    dispatch_async(dispatch_get_main_queue(), ^{

        if(audioEngine.isRunning){
            [inputNode removeTapOnBus:0];
            [inputNode reset];
            [audioEngine stop];
            [recognitionRequest endAudio];
            [recognitionTask cancel];
            recognitionTask = nil;
            recognitionRequest = nil;
        }
    });
}

Croon

Solved my problem.Thanks. I was getting Domain=kAFAssistantErrorDomain Code=216 "(null)" – Sunburn

It's my pleasure to help devs – Croon

Answer 2

I figured it out that the "endAudio" not allow to call from outside the recognitionTaskWithRequest block, if you directly to call the method "[self stopRecording]" then the block will response the error "kAFAssistantErrorDomain Code=203" immediately.

here is the 4 part in my code with stopRecord

1 and 2 is fine

3 and 4 error 　

1.from block → detecedVoice → withVoiceControl → stopRecord → ok

2.from block error → stopRecord → startRecord → ok

3.button tap → stopRecord → kAFAssistantErrorDomain Code=203

4.timer 40s → stopRecord → startRecord → kAFAssistantErrorDomain Code=203

Sikorski

Then what is the alternative if I need to call .endAudio from outside recognitionTaskWithRequest , in viewDidDisappear() for example? – Boggle

Have you tried the original Apple's SpeakToMe sample project? Since it contains the same code, as I can see, it seems like another Apple bug, either in the sample, so we all can produce bugs, or in the framework. – Hobnob

Answer 3

As someone has indicated that it's not exactly an error even though it's disguised as an error. What really has happened is that the recognition time is longer than 1 minute limit Apple has set for the API and during the one minute limit no word has been recognized.
The solution is to add a timer to stop recognition after a period time of less than 60 seconds:

var timerSST = timerSST = Timer.scheduledTimer(timeInterval: value, target: self, selector: #selector(fire), userInfo: nil, repeats: true)

Start the timer when the view controller starts. When the timer expires, it calls:

@objc func fire()
{
    if(startedSTT) {
        stopRecording()
    }
        // restart it
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
            do {
                try self.startRecording()
            } catch let error {
                print("There was a problem starting recording: \(error.localizedDescription)")
            }
        }


}  

Here is an example on how to do stop:

    fileprivate func stopRecording() {
    audioEngine.stop()
    request.endAudio()
    recognitionTask?.cancel()
    //recognitionTask?.finish()
    audioEngine.inputNode.removeTap(onBus: 0);
    audioEngine.inputNode.reset()
    startedSTT = false
}

If Stop is not done properly, you won't be able to restart recording for recognition. Pay attention to lines:

recognitionTask?.cancel() vs .finish  

And reset of inputNode:

audioEngine.inputNode.removeTap(onBus: 0);
audioEngine.inputNode.reset()

Using these techniques, I was able to make continues speech recognition work this way.
Hope it helps!

David

Smalls

Was trying to give a button to change the language. Been banging my head for a while because of an error on reinitialisation. Giving delay of 1 sec fixed it! – Antiworld