private void _speechRecognizer_Results(object sender, ResultsEventArgs e)
{
try
{
SpeechRecognitionResult?.Invoke(this, new SpeechRecognitionEventArgs(e.Results.GetStringArrayList(SpeechRecognizer.ResultsRecognition).ToList()));
}
catch (Exception) { }
}
public void StartSpeechRecognition()
{
StopSpeechRecognizer(false);
StopAudio();
_recognizerText = "";
AVAudioSession.SharedInstance().SetActive(true, AVAudioSessionSetActiveOptions.NotifyOthersOnDeactivation);
var request = new SFSpeechAudioBufferRecognitionRequest();
request.ShouldReportPartialResults = true;
var inputNode = engine.InputNode;
_task = _recognizer.GetRecognitionTask(request, (result, error) =>
{
if (result != null)
{
_recognizerText = result.BestTranscription.FormattedString;
if (_recognizerTimer == null)
{
_recognizerTimer = new Timer(RecognizeTimerElapsed, this, TimeSpan.FromSeconds(1), Timeout.InfiniteTimeSpan);
}
else
{
_recognizerTimer.Change(TimeSpan.FromSeconds(1), Timeout.InfiniteTimeSpan);
}
if (result.Final)
{
SpeechRecognitionResult?.Invoke(this, new SpeechRecognitionEventArgs(_recognizerText));
}
else
{
SpeechRecognitionPartialResult?.Invoke(this, new SpeechRecognitionEventArgs(_recognizerText));
}
}
if (error != null || result?.Final == true)
{
StopSpeechRecognizer(false);
}
});
var recordingFormat = inputNode.GetBusOutputFormat(0);
inputNode.InstallTapOnBus(0, 1024, recordingFormat, (AVAudioPcmBuffer buffer, AVAudioTime when) =>
{
request.Append(buffer);
});
engine.Prepare();
NSError engineError = null;
if (engine.StartAndReturnError(out engineError))
{
}
}
private void _speechRecognizer_Error(object sender, ErrorEventArgs e)
{
//Evaluate e.Error?
try
{
if (e.Error == SpeechRecognizerError.NoMatch || e.Error == SpeechRecognizerError.SpeechTimeout)
{
SpeechRecognitionResult?.Invoke(this, new SpeechRecognitionEventArgs(""));
}
}
catch (Exception) { }
}
private void RecognizeTimerElapsed(object state)
{
StopSpeechRecognizer(false);
Xamarin.Forms.Device.BeginInvokeOnMainThread(() => SpeechRecognitionResult?.Invoke(this, new SpeechRecognitionEventArgs(_recognizerText)));//Necessary to run on UI thread
}