/// <summary>
/// Starts service
/// </summary>
protected override void Start()
{
try
{
if (this.state == null)
{
this.state = new SpeechRecognizerState();
}
InitializeKinectAudio();
// Set up speech recognition engine
if (this.state.IgnoreAudioInput)
{
this.state.Recognizer.SetInputToNull();
}
else
{
SetRecognizerInputToKinectMicArray();
}
// Register handlers for speech and beam events
this.state.Recognizer.RecognizerUpdateReached += RecognizerUpdateReachedHandler;
this.state.Recognizer.LoadGrammarCompleted += LoadGrammarCompletedHandler;
this.state.Recognizer.SpeechDetected += SpeechDetectedHandler;
this.state.Recognizer.SpeechRecognized += SpeechRecognizedHandler;
this.state.Recognizer.SpeechRecognitionRejected += SpeechRecognitionRejectedHandler;
this.kinectAudioSource.BeamAngleChanged += BeamChangedHandler;
}
catch (Exception exception)
{
// Fatal exception during startup, shutdown service
LogError(LogGroups.Activation, exception);
if (null != this.state.Recognizer)
{
this.state.Recognizer.Dispose();
}
DefaultDropHandler(new DsspDefaultDrop());
return;
}
SpawnIterator(LoadGrammarOnStartup);
}
public IEnumerator <ITask> ReplaceHandler(Replace replace)
{
SpeechRecognizerState newState = replace.Body;
#region Set up load grammar request, load grammar and on success store new grammar in state
// Set up load grammar request
LoadGrammarRequest loadRequest = new LoadGrammarRequest();
loadRequest.GrammarType = newState.GrammarType;
loadRequest.SrgsFileLocation = newState.SrgsFileLocation;
loadRequest.DictionaryGrammar = newState.DictionaryGrammar;
// Load new grammar
SuccessFailurePort loadGrammarPort = new SuccessFailurePort();
SpawnIterator <LoadGrammarRequest, SuccessFailurePort>(
loadRequest,
loadGrammarPort,
LoadGrammar
);
// Check loading outcome
yield return((Choice)loadGrammarPort);
Exception exception = (Exception)loadGrammarPort;
if (exception != null)
{
LogWarning(exception);
replace.ResponsePort.Post(Fault.FromCodeSubcodeReason(
W3C.Soap.FaultCodes.Receiver,
DsspFaultCodes.OperationFailed,
exception.Message
));
yield break;
}
#endregion
#region Check new state's IgnoreAudioInput flag and start recognition engine if necessary
if (newState.IgnoreAudioInput != state.IgnoreAudioInput)
{
state.IgnoreAudioInput = newState.IgnoreAudioInput;
if (state.IgnoreAudioInput)
{
// Stop engine and switch to ignoring audio input
state.Recognizer.RecognizeAsyncCancel();
state.Recognizer.SetInputToNull();
}
else
{
SetRecognizerInputToKinectMicArray();
// Because old state ignored audio input the engine is stopped, now that
// we switched to listening to audio input the engine needs to be started
if (state.Recognizer.Grammars.Count > 0)
{
state.Recognizer.RecognizeAsync(RecognizeMode.Multiple);
}
}
}
#endregion
SaveState(this.state);
// Notify subscribers of state change
replace.Body = this.state;
SendNotification <Replace>(this.subMgrPort, replace);
replace.ResponsePort.Post(DefaultReplaceResponseType.Instance);
}
