async Task SpeakUtterance(AVSpeechUtterance speechUtterance, CancellationToken cancelToken)
{
AVSpeechSynthesizer speechSynthesizer = new AVSpeechSynthesizer();
try
{
currentSpeak = new TaskCompletionSource <object>();
speechSynthesizer.DidFinishSpeechUtterance += OnFinishedSpeechUtterance;
speechSynthesizer.SpeakUtterance(speechUtterance);
using (cancelToken.Register(TryCancel))
{
await currentSpeak.Task;
}
}
finally
{
speechSynthesizer.DidFinishSpeechUtterance -= OnFinishedSpeechUtterance;
speechSynthesizer.Dispose();
}
void OnFinishedSpeechUtterance(object sender, AVSpeechSynthesizerUteranceEventArgs args) =>
currentSpeak?.TrySetResult(null);
void TryCancel()
{
speechSynthesizer?.StopSpeaking(AVSpeechBoundary.Word);
currentSpeak?.TrySetCanceled();
}
}
public override void ViewDidDisappear(bool animated)
{
base.ViewDidDisappear(animated);
// Check if sample is being closed.
if (NavigationController?.ViewControllers == null)
{
// Stop the location data source.
_myMapView.LocationDisplay?.DataSource?.StopAsync();
// Stop the speech synthesizer.
_speechSynthesizer.StopSpeaking(AVSpeechBoundary.Word);
_speechSynthesizer.Dispose();
// Stop the tracker.
if (_tracker != null)
{
_tracker.TrackingStatusChanged -= TrackingStatusUpdated;
_tracker.NewVoiceGuidance -= SpeakDirection;
_tracker.RerouteStarted -= RerouteStarted;
_tracker.RerouteCompleted -= RerouteCompleted;
_tracker = null;
}
}
// Unsubscribe from events, per best practice.
_navigateButton.Clicked -= StartNavigation;
_recenterButton.Clicked -= RecenterButton_Click;
}
partial void OnDispose(bool disposing)
{
if (disposing)
{
speechSynthesizer?.Dispose();
}
}
public void Dispose()
{
synthesizer.DidFinishSpeechUtterance -= OnFinishedSpeechUtterance;
utterance.Dispose();
synthesizer.Dispose();
utterance = null;
synthesizer = null;
}
/// <summary>
/// Dispose of TTS
/// </summary>
public void Dispose()
{
if (speechSynthesizer != null)
{
speechSynthesizer.Dispose();
speechSynthesizer = null;
}
}
public IObservable<Unit> SpeakAsync(string speechString, CancellationToken cancellationToken = default(CancellationToken))
{
speechString.AssertNotNull(nameof(speechString));
var utterance = new AVSpeechUtterance(speechString)
{
Voice = voice,
Rate = 0.55f
};
var synthesizer = new AVSpeechSynthesizer();
var finishedUtterance = Observable
.FromEventPattern<AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidFinishSpeechUtterance += x, x => synthesizer.DidFinishSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Publish();
finishedUtterance
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
if (cancellationToken.CanBeCanceled)
{
cancellationToken.Register(() => synthesizer.StopSpeaking(AVSpeechBoundary.Immediate));
Observable
.FromEventPattern<AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidCancelSpeechUtterance += x, x => synthesizer.DidCancelSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
}
synthesizer.SpeakUtterance(utterance);
finishedUtterance.Connect();
return finishedUtterance
.FirstAsync()
.RunAsync(cancellationToken);
}
public IObservable <Unit> SpeakAsync(string speechString, CancellationToken cancellationToken = default(CancellationToken))
{
speechString.AssertNotNull(nameof(speechString));
var utterance = new AVSpeechUtterance(speechString)
{
Voice = voice,
Rate = 0.55f
};
var synthesizer = new AVSpeechSynthesizer();
var finishedUtterance = Observable
.FromEventPattern <AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidFinishSpeechUtterance += x, x => synthesizer.DidFinishSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Publish();
finishedUtterance
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
if (cancellationToken.CanBeCanceled)
{
cancellationToken.Register(() => synthesizer.StopSpeaking(AVSpeechBoundary.Immediate));
Observable
.FromEventPattern <AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidCancelSpeechUtterance += x, x => synthesizer.DidCancelSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
}
synthesizer.SpeakUtterance(utterance);
finishedUtterance.Connect();
return(finishedUtterance
.FirstAsync()
.RunAsync(cancellationToken));
}
public override void Dispose()
{
if (synth != null)
{
synth.DidFinishSpeechUtterance -= Synth_DidFinishSpeechUtterance;
}
synth?.Dispose();
synth = null;
utterances.ClearAsync(a => a.Value?.TrySetCanceled());
}
public IObservable <Unit> Speak(string speechString)
{
Ensure.ArgumentNotNull(speechString, nameof(speechString));
return(Observable
.Create <Unit>(
observer =>
{
var disposables = new CompositeDisposable();
var utterance = new AVSpeechUtterance(speechString)
{
Voice = voice,
Rate = 0.55f
}
.AddTo(disposables);
var synthesizer = new AVSpeechSynthesizer()
.AddTo(disposables);
var finishedUtterance = Observable
.FromEventPattern <AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidFinishSpeechUtterance += x, x => synthesizer.DidFinishSpeechUtterance -= x)
.ToSignal()
.Publish();
finishedUtterance
.SubscribeSafe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
})
.AddTo(disposables);
finishedUtterance
.FirstAsync()
.Subscribe(observer)
.AddTo(disposables);
finishedUtterance
.Connect()
.AddTo(disposables);
synthesizer.SpeakUtterance(utterance);
return disposables;
}));
}
public IObservable <Unit> Speak(string speechString)
{
Ensure.ArgumentNotNull(speechString, nameof(speechString));
var utterance = new AVSpeechUtterance(speechString)
{
Voice = voice,
Rate = 0.55f
};
var synthesizer = new AVSpeechSynthesizer();
var finishedUtterance = Observable
.FromEventPattern <AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidFinishSpeechUtterance += x, x => synthesizer.DidFinishSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Publish();
finishedUtterance
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
//if (cancellationToken.CanBeCanceled)
//{
// cancellationToken.Register(() => synthesizer.StopSpeaking(AVSpeechBoundary.Immediate));
// Observable
// .FromEventPattern<AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidCancelSpeechUtterance += x, x => synthesizer.DidCancelSpeechUtterance -= x)
// .Select(_ => Unit.Default)
// .Subscribe(
// _ =>
// {
// utterance.Dispose();
// synthesizer.Dispose();
// });
//}
synthesizer.SpeakUtterance(utterance);
finishedUtterance.Connect();
return(finishedUtterance
.FirstAsync());
}
public IObservable<Unit> Speak(string speechString)
{
Ensure.ArgumentNotNull(speechString, nameof(speechString));
var utterance = new AVSpeechUtterance(speechString)
{
Voice = voice,
Rate = 0.55f
};
var synthesizer = new AVSpeechSynthesizer();
var finishedUtterance = Observable
.FromEventPattern<AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidFinishSpeechUtterance += x, x => synthesizer.DidFinishSpeechUtterance -= x)
.Select(_ => Unit.Default)
.Publish();
finishedUtterance
.Subscribe(
_ =>
{
utterance.Dispose();
synthesizer.Dispose();
});
//if (cancellationToken.CanBeCanceled)
//{
// cancellationToken.Register(() => synthesizer.StopSpeaking(AVSpeechBoundary.Immediate));
// Observable
// .FromEventPattern<AVSpeechSynthesizerUteranceEventArgs>(x => synthesizer.DidCancelSpeechUtterance += x, x => synthesizer.DidCancelSpeechUtterance -= x)
// .Select(_ => Unit.Default)
// .Subscribe(
// _ =>
// {
// utterance.Dispose();
// synthesizer.Dispose();
// });
//}
synthesizer.SpeakUtterance(utterance);
finishedUtterance.Connect();
return finishedUtterance
.FirstAsync();
}
public override void Speak(string text, bool gender, int pitch)
{
var speechSynthesizer = new AVSpeechSynthesizer();
var voci = AVSpeechSynthesisVoice.GetSpeechVoices();
var choices = voci.Where(x => x.Description.Contains(gender ? "female" : "male"));
//prefer us
AVSpeechSynthesisVoice voice;
voice = choices.FirstOrDefault(x => x.Language.ToLowerInvariant().Contains("en-gb"));
if (voice == null)
{
voice = choices.FirstOrDefault(x => x.Language.ToLowerInvariant().Contains("en-gb"));
}
if (voice == null && voci.Length > 0)
{
voice = voci[0];
}
if (voice == null)
{
return;
}
var speechUtterance = new AVSpeechUtterance(text)
{
Rate = AVSpeechUtterance.DefaultSpeechRate,
Voice = voice,
Volume = 0.5f,
PitchMultiplier = pitch / 100f
};
speechSynthesizer.SpeakUtterance(speechUtterance);
speechSynthesizer.DidFinishSpeechUtterance += (sender, e) =>
{
speechSynthesizer.Dispose();
};
}
/// <summary> /// Dispose of TTS /// </summary> public void Dispose() => speechSynthesizer?.Dispose();