public void StopListening()
{
if (ListeningState == ListeningState.Active)
{
ListeningState = ListeningState.Inactive;
_timer.Stop();
}
}
public void StartListening()
{
if (ListeningState == ListeningState.Inactive)
{
ListeningState = ListeningState.Active;
_timer.AutoReset = true;
_timer.Interval = 10; //ms
_timer.Elapsed += _timer_Elapsed;
_timer.Start();
}
}
private async Task changeStateAsync(ListeningState state)
{
if (listeningState != state)
{
System.Diagnostics.Debug.WriteLine($"Changing CommandInterpreter listening state to {state}");
if (state == ListeningState.Hypothesis)
{
preHypothesisListeningState = listeningState;
}
listeningState = state;
await listener.StopListeningAsync();
switch (state)
{
case ListeningState.Move:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, false);
break;
case ListeningState.PieceConfirmation:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, true);
break;
case ListeningState.Hypothesis:
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.YesNoCommands, true);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.MoveCommands, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.PieceConfirmation, false);
SpeechConstraints.EnableGrammar(recognizer.Constraints, GrammarMode.CancelCommand, true);
break;
default:
await listener.StartListeningAsync();
throw new Exception("Tried to change CommandInterpreter state to an unknown listening state");
}
await listener.StartListeningAsync();
}
}
private void _speechRecognitionEngine_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
{
if (e.Result.Confidence < _configuration.ConfidenceLevel)
{
Console.WriteLine($"Confidence level not reached ({e.Result.Confidence})");
return;
}
if (ListeningState == ListeningState.Passive)
{
ListeningState = ListeningState.Active;
Console.WriteLine($"Listening State changed to Active");
LoadActiveGrammar();
}
// Must be in Active state
Command command = Command.Get(e.Result.Text);
CommandResult commandResult = command.Execute();
Console.WriteLine($"Speech Recognised= {e.Result.Text}; Confidence={e.Result.Confidence}");
}
