/// <summary>
/// Asynchronously add constraint in speech recognizer
/// </summary>
public async Task <SpeechRecognitionCompilationResult> AddConstraintAsync(ISpeechRecognitionConstraint constraint, bool compile = true)
{
if (SpeechRecognizer.State != SpeechRecognizerState.Idle)
{
Debug.WriteLine($"STTService Failed to add constraint because of speech recognizer state : {SpeechRecognizer.State}");
return(null);
}
SpeechRecognizer.Constraints.Add(constraint);
if (!compile)
{
return(null);
}
return(await SpeechRecognizer.CompileConstraintsAsync());
}
async Task StartListeningForConstraintAsync(
ISpeechRecognitionConstraint constraint)
{
if (this.speechRecognizer == null)
{
this.speechRecognizer = new SpeechRecognizer();
this.speechRecognizer.ContinuousRecognitionSession.ResultGenerated
+= OnSpeechResult;
}
else
{
await this.speechRecognizer.ContinuousRecognitionSession.StopAsync();
}
this.speechRecognizer.Constraints.Clear();
this.speechRecognizer.Constraints.Add(constraint);
await this.speechRecognizer.CompileConstraintsAsync();
await this.speechRecognizer.ContinuousRecognitionSession.StartAsync();
}
async Task StartListeningForConstraintAsync(
ISpeechRecognitionConstraint constraint)
{
if (this.speechRecognizer == null)
{
this.speechRecognizer = new SpeechRecognizer();
this.speechRecognizer.ContinuousRecognitionSession.ResultGenerated
+= OnSpeechResult;
}
else
{
await this.speechRecognizer.ContinuousRecognitionSession.StopAsync();
}
this.speechRecognizer.Constraints.Clear();
this.speechRecognizer.Constraints.Add(constraint);
await this.speechRecognizer.CompileConstraintsAsync();
await this.speechRecognizer.ContinuousRecognitionSession.StartAsync();
}