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 async Task <SpeechRecognitionCompilationResult> setupGrammarConstraintsAsync()
{
var grammarConstraints = await SpeechConstraints.GetConstraintsAsync();
foreach (var constraint in grammarConstraints)
{
if (constraint != null)
{
recognizer.Constraints.Add(constraint);
}
else
{
System.Diagnostics.Debug.WriteLine("Received a null grammar constraint");
}
}
return(await recognizer.CompileConstraintsAsync().AsTask());
}
public static async Task <CommandInterpreter> CreateAsync()
{
var speechRecognizer = new SpeechRecognizer();
var interpreter = new CommandInterpreter(speechRecognizer, new Communicator());
var grammarCompilationResult = await interpreter.setupGrammarConstraintsAsync();
if (grammarCompilationResult.Status != SpeechRecognitionResultStatus.Success)
{
throw new FormatException($"Could not compile grammar constraints. Received error {grammarCompilationResult.Status}");
}
// Disable unnecessary grammars
SpeechConstraints.EnableGrammar(speechRecognizer.Constraints, GrammarMode.MoveCommands, true);
SpeechConstraints.EnableGrammar(speechRecognizer.Constraints, GrammarMode.PieceConfirmation, false);
SpeechConstraints.EnableGrammar(speechRecognizer.Constraints, GrammarMode.YesNoCommands, false);
SpeechConstraints.EnableGrammar(speechRecognizer.Constraints, GrammarMode.CancelCommand, false);
return(interpreter);
}
