private void SpeakWithMicrosoftSpeechLibrary(string textToSpeak, Action onComplete, int?volume, int?rate, string voice)
{
var voiceToUse = voice ?? Settings.Default.SpeechVoice;
if (!string.IsNullOrWhiteSpace(voiceToUse))
{
if (!useLegacyMicrosoftSpeechForVoices.Contains(voiceToUse))
{
try
{
speechSynthesiser.SelectVoice(voiceToUse);
speechSynthesiser.Rate = rate ?? Settings.Default.SpeechRate;
speechSynthesiser.Volume = volume ?? Settings.Default.SpeechVolume;
}
catch //(Exception exception)
{
//Commenting out the raising of an error notification for now
//var customException = new ApplicationException(string.Format(Resources.UNABLE_TO_SET_VOICE_WARNING,
// voiceToUse, voice == null ? Resources.VOICE_COMES_FROM_SETTINGS : null), exception);
//PublishError(this, customException);
Log.Warn($"Unable to speak using SpeechSynthesizer and voice '{voiceToUse}'. Switching to legacy speech mode and trying again...");
useLegacyMicrosoftSpeechForVoices.Add(voiceToUse);
}
}
if (useLegacyMicrosoftSpeechForVoices.Contains(voiceToUse))
{
Log.Info("Attempting speech using legacy mode.");
try
{
if (legacySpeechSynthesiser == null)
{
//Lazy instantiate legacy speech synthesiser
legacySpeechSynthesiser = new SpVoice();
}
var availableVoices = legacySpeechSynthesiser.GetVoices(string.Empty, string.Empty);
if (legacyMicrosoftSpeechVoiceToTokenIndexLookup.ContainsKey(voiceToUse))
{
int voiceIndex = legacyMicrosoftSpeechVoiceToTokenIndexLookup[voiceToUse];
Log.InfoFormat($"{voiceToUse} voice token exists at index {voiceIndex}. Setting voice on legacy speech synthesiser.");
legacySpeechSynthesiser.Voice = availableVoices.Item(voiceIndex);
Log.Info("Voice token set.");
}
else
{
for (int voiceIndex = 0; voiceIndex < availableVoices.Count; voiceIndex++)
{
var voiceToken = availableVoices.Item(voiceIndex);
if (voiceToken.GetDescription() == voiceToUse)
{
Log.InfoFormat($"{voiceToUse} voice token found at index {voiceIndex}. Setting voice on legacy speech synthesiser.");
legacyMicrosoftSpeechVoiceToTokenIndexLookup.Add(voiceToUse, voiceIndex);
legacySpeechSynthesiser.Voice = voiceToken;
Log.Info("Voice token set.");
break;
}
}
}
}
catch (Exception exception)
{
var customException = new ApplicationException(string.Format(Resources.UNABLE_TO_SET_VOICE_WARNING,
voiceToUse, voice == null ? Resources.VOICE_COMES_FROM_SETTINGS : null), exception);
PublishError(this, customException);
}
}
}
//Speak
if (!useLegacyMicrosoftSpeechForVoices.Contains(voiceToUse))
{
onSpeakCompleted = (sender, args) =>
{
lock (speakCompletedLock)
{
if (onSpeakCompleted != null)
{
speechSynthesiser.SpeakCompleted -= onSpeakCompleted;
onSpeakCompleted = null;
}
if (onComplete != null)
{
onComplete();
}
}
};
speechSynthesiser.SpeakCompleted += onSpeakCompleted;
speechSynthesiser.SpeakAsync(textToSpeak);
}
else
{
//Legacy speech mode
if (legacySpeechSynthesiser != null)
{
legacySpeechSynthesiser.Speak(textToSpeak, SpeechVoiceSpeakFlags.SVSFIsNotXML | SpeechVoiceSpeakFlags.SVSFlagsAsync);
var speechHandle = legacySpeechSynthesiser.SpeakCompleteEvent();
var speechHandlePtr = new IntPtr(speechHandle);
if (speechHandlePtr != IntPtr.Zero)
{
var autoResetEvent = new AutoResetEvent(false)
{
SafeWaitHandle = new SafeWaitHandle(speechHandlePtr, false)
};
var uiThreadDispatcher = Dispatcher.CurrentDispatcher;
legacySpeakCompleted = (state, timedOut) =>
{
if (onComplete != null)
{
uiThreadDispatcher.Invoke(onComplete);
}
autoResetEvent.Dispose();
legacySpeakCompleted = null;
};
ThreadPool.RegisterWaitForSingleObject(autoResetEvent, legacySpeakCompleted, null, 30000, true);
}
}
}
}
