/// <summary>
/// Speaks the text in the provided <see cref="SpeechString"/> using the enclosed data.
/// </summary>
/// <returns>Nothing.</returns>
private async Task Speak(SpeechString speech)
{
// create a new memory stream and speech synth, to be disposed of after this method executes.
using (MemoryStream stream = new MemoryStream())
using (SpeechSynthesizer synth = new SpeechSynthesizer())
{
// set synthesizer properties
synth.SetOutputToWaveStream(stream);
synth.Rate = speech.Rate;
synth.Volume = speech.Volume;
// TODO: refine the speech builder and actually use the style.
PromptBuilder builder = new PromptBuilder();
PromptStyle style = new PromptStyle();
builder.StartVoice(speech.Voice.VoiceInfo);
builder.StartSentence();
builder.AppendText(speech.Text);
builder.EndSentence();
builder.EndVoice();
// "speaks" the text directly into the memory stream
synth.Speak(builder);
// then block while the speech is being played.
await AudioManager.Instance.Play(stream, speech.PrimaryDevice.DeviceNumber, speech.SecondaryDevice.DeviceNumber);
}
}
/// <summary>
/// Queues a TTS task if the queue isn't full.
/// </summary>
/// <param name="text">Text to speak.</param>
/// <param name="device1">The <see cref="SoundDevice"/> to use when speaking.</param>
/// <param name="voice">The voice to use.</param>
/// <param name="rate">The rate to speak this text at. Clamped to [<see cref="MIN_RATE"/>, <see cref="MAX_RATE"/>].</param>
/// <param name="volume">The volume to speak this text at. Clamped to [<see cref="MIN_VOLUME"/>, <see cref="MAX_VOLUME"/>].</param>
public void QueueTTS(string text, SoundDevice device1, SoundDevice device2, InstalledVoice voice, int rate = DEFAULT_RATE, int volume = DEFAULT_VOLUME)
{
if (!IsQueueFull())
{
SpeechString data = new SpeechString(text, voice, rate, volume, device1, device2);
TTSQueue.Enqueue(data);
TTSHistory.Enqueue(data);
}
}
public SpeechSynthManager()
{
TTSQueue = new ObservableQueue <SpeechString>();
TTSHistory = new ObservableQueue <SpeechString>();
_queueTaskCt = new CancellationTokenSource();
var token = _queueTaskCt.Token;
_queueTask = Task.Run(async() =>
{
while (true)
{
// cancel if requested.
if (token.IsCancellationRequested)
{
return;
}
// if the queue has entries, play the next one.
if (TTSQueue.Count > 0)
{
// this will await until the TTS clip has finished playing.
SpeechString str = TTSQueue.Peek();
await Application.Current.Dispatcher.BeginInvoke(new Action(() => this.TTSQueue.Dequeue()));
await Speak(str);
}
}
}, token);
// hack method to get installed voices because there's no direct method of getting these
var tmp = new SpeechSynthesizer();
Voices = tmp.GetInstalledVoices();
tmp.Dispose();
Instance = this;
}
