private CMPSpeechError PrepareAudioEngineError(NSError recognitionError)
{
var genericError = new CMPSpeechError(recognitionError);
genericError.Code = (int)(recognitionError.Code);
genericError.Domain = GetErrorDomain();
genericError.Message = recognitionError.LocalizedDescription;
return(genericError);
}
private CMPSpeechError PrepareAuthorizationError(SFSpeechRecognizerAuthorizationStatus status)
{
string errorDomainString = GetErrorDomain();
string erorMessageString = GetStatusMessageString(status);
var genericError = new CMPSpeechError();
genericError.Code = (int)(status);
genericError.Domain = GetErrorDomain();
genericError.Message = erorMessageString;
return(genericError);
}
public async Task <Tuple <string, Tuple <bool, CMPSpeechError> > > StartRecordingAsync()
{
if (IsRecording() == true)
{
return(new Tuple <string, Tuple <bool, CMPSpeechError> > (string.Empty, null));
}
var authorizationResult = await CheckAuthorizationAsync();
if (authorizationResult == null)
{
return(new Tuple <string, Tuple <bool, CMPSpeechError> >(string.Empty, null));
}
if (authorizationResult.Item1 == false)
{
return(new Tuple <string, Tuple <bool, CMPSpeechError> >(string.Empty, authorizationResult));
}
CMPSpeechError genericError = null;
var inputNode = _speechAudioEngine.InputNode;
if (inputNode == null)
{
var audioEngineError = new NSError(new NSString(string.Empty), nint.Parse(SpeechToTextErrorEnum.
eNoInputNode.ToString()));
genericError = PrepareAudioEngineError(audioEngineError);
ResetSpeechToText();
return(new Tuple <string, Tuple <bool, CMPSpeechError> >(string.Empty, new Tuple <bool, CMPSpeechError>
(false, genericError)));
}
Tuple <string, Tuple <bool, CMPSpeechError> > recognitionResult = null;
await Task.Run(() =>
{
try
{
_speechRecognitionTask = _speechRecognizer.GetRecognitionTask(_speechRecognitionRequest,
(SFSpeechRecognitionResult result,
NSError speechError) =>
{
if (speechError != null)
{
_speechAudioEngine.Stop();
genericError = new CMPSpeechError(speechError);
recognitionResult = new Tuple <string, Tuple <bool, CMPSpeechError> >(string.Empty,
new Tuple <bool, CMPSpeechError>(false,
genericError));
ResetSpeechToText();
_speechSemaphore.Release();
return;
}
if (result.Final == true)
{
_speechAudioEngine.Stop();
inputNode.RemoveTapOnBus(0);
recognitionResult = new Tuple <string, Tuple <bool, CMPSpeechError> >(result.BestTranscription.
FormattedString,
new Tuple <bool,
CMPSpeechError>(true,
null));
ResetSpeechToText();
_speechSemaphore.Release();
return;
}
});
var audioFormat = inputNode.GetBusOutputFormat(0);
inputNode.InstallTapOnBus(0, 2048, audioFormat, (AVAudioPcmBuffer buffer, AVAudioTime when) =>
{
var state = _speechRecognitionTask.State;
_speechRecognitionRequest.Append(buffer);
});
_speechAudioEngine.Prepare();
NSError audioEngineError = null;
bool couldStart = _speechAudioEngine.StartAndReturnError(out audioEngineError);
if (couldStart == false)
{
genericError = PrepareAudioEngineError(audioEngineError);
recognitionResult = new Tuple <string, Tuple <bool, CMPSpeechError> >(string.Empty,
new Tuple <bool, CMPSpeechError>(false,
genericError));
ResetSpeechToText();
_speechSemaphore.Release();
return;
}
}
catch (Exception exception)
{
Diagonostics.Debug.WriteLine(exception.Message);
ResetSpeechToText();
_speechSemaphore.Release();
}
});
await _speechSemaphore.WaitAsync();
return(recognitionResult);
}