private MemoryStream SystemSpeechSynthesis(VoiceDetails voice, string speech, SpeechServiceConfiguration Configuration)
{
if (voice is null || speech is null)
{
return(null);
}
// Speak using the system's native speech synthesizer (System.Speech.Synthesis).
var stream = new MemoryStream();
var synthThread = new Thread(() =>
{
try
{
lock (synthLock)
{
if (!voice.name.Equals(synth.Voice.Name))
{
Logging.Debug("Selecting voice " + voice);
synth.SelectVoice(voice.name);
}
synth.Rate = Configuration.Rate;
synth.Volume = Configuration.Volume;
synth.SetOutputToWaveStream(stream);
Logging.Debug(JsonConvert.SerializeObject(Configuration));
SpeechFormatter.PrepareSpeech(voice, ref speech, out var useSSML);
if (useSSML)
{
try
{
Logging.Debug("Feeding SSML to synthesizer: " + speech);
synth.SpeakSsml(speech);
}
catch (Exception ex)
{
var badSpeech = new Dictionary <string, object>
{
{ "voice", voice },
{ "speech", speech },
{ "exception", ex }
};
Logging.Warn("Speech failed. Stripping IPA tags and re-trying.", badSpeech);
synth.SpeakSsml(SpeechFormatter.DisableIPA(speech));
}
}
else
{
Logging.Debug("Feeding normal text to synthesizer: " + speech);
synth.Speak(speech);
}
}
stream.Position = 0;
}
catch (ThreadAbortException)
{
Logging.Debug("Thread aborted");
}
catch (Exception ex)
{
Logging.Warn("Speech failed: ", ex);
var badSpeech = new Dictionary <string, object>
{
{ "voice", voice },
{ "speech", speech },
};
string badSpeechJSON = JsonConvert.SerializeObject(badSpeech);
Logging.Info("Speech failed", badSpeechJSON);
}
});
synthThread.Start();
synthThread.Join();
return(stream);
}
private SpeechSynthesisStream WindowsMediaSpeechSynthesis(VoiceDetails voice, string speech, SpeechServiceConfiguration Configuration)
{
if (voice is null || speech is null)
{
return(null);
}
// Speak using the Windows.Media.SpeechSynthesis speech synthesizer.
SpeechSynthesisStream stream = null;
var synthThread = new Thread(() =>
{
try
{
double ConvertSpeakingRate(int rate)
{
// Convert from rate from -10 to 10 (with 0 being normal speed) to rate from 0.5X to 3X (with 1.0 being normal speed)
var result = 1.0;
if (rate < 0)
{
result += rate * 0.05;
}
else if (rate > 0)
{
result += rate * 0.2;
}
return(result);
}
lock (synthLock)
{
if (!voice.name.Equals(synth.Voice.DisplayName))
{
Logging.Debug("Selecting voice " + voice);
synth.Voice =
SpeechSynthesizer.AllVoices.FirstOrDefault(v =>
v.DisplayName == voice.name);
}
synth.Options.SpeakingRate = ConvertSpeakingRate(Configuration.Rate);
synth.Options.AudioVolume = (double)Configuration.Volume / 100;
Logging.Debug(JsonConvert.SerializeObject(Configuration));
SpeechFormatter.PrepareSpeech(voice, ref speech, out var useSSML);
if (useSSML)
{
try
{
Logging.Debug("Feeding SSML to synthesizer: " + speech);
stream = synth.SynthesizeSsmlToStreamAsync(speech).AsTask().Result;
}
catch (Exception ex)
{
var badSpeech = new Dictionary <string, object>
{
{ "voice", voice },
{ "speech", speech },
{ "exception", ex }
};
Logging.Warn("Speech failed. Stripping IPA tags and re-trying.", badSpeech);
stream = synth.SynthesizeSsmlToStreamAsync(SpeechFormatter.DisableIPA(speech)).AsTask().Result;
}
}
else
{
Logging.Debug("Feeding normal text to synthesizer: " + speech);
stream = synth.SynthesizeTextToStreamAsync(speech).AsTask().Result;
}
}
stream.Seek(0);
}
catch (ThreadAbortException)
{
Logging.Debug("Thread aborted");
}
catch (Exception ex)
{
var badSpeech = new Dictionary <string, object>
{
{ "voice", voice },
{ "speech", speech },
{ "exception", ex }
};
string badSpeechJSON = JsonConvert.SerializeObject(badSpeech);
Logging.Warn("Speech failed", badSpeechJSON);
}
});
synthThread.Start();
synthThread.Join();
return(stream);
}