/// <summary>
/// Stops the engine if it is running.
/// </summary>
public static void Stop()
{
lock (syncLock)
{
if (!isRunning)
{
return;
}
cache.Stop();
cache = null;
isRunning = false;
}
}
private static Dictionary <string, string> voiceNameMap; // Maps friendly voice names to the internal name
/// <summary>
/// Starts the engine if it is not already running.
/// </summary>
/// <param name="settings">The engine settings.</param>
/// <exception cref="ArgumentNullException">Thrown if <paramref name="settings"/> is <c>null</c>.</exception>
public static void Start(SpeechEngineSettings settings)
{
if (settings == null)
{
throw new ArgumentNullException("settings");
}
lock (syncLock)
{
if (SpeechEngine.isRunning)
{
return;
}
SpeechEngine.settings = settings;
SpeechEngine.cache = new PhraseCache(settings);
SpeechEngine.isRunning = true;
// Create the default audio formats.
format_8000KHz = new SpeechAudioFormatInfo(8000, AudioBitsPerSample.Eight, AudioChannel.Mono);
format_11025KHz = new SpeechAudioFormatInfo(11025, AudioBitsPerSample.Eight, AudioChannel.Mono);
format_16000KHz = new SpeechAudioFormatInfo(16000, AudioBitsPerSample.Eight, AudioChannel.Mono);
// Get the fully qualified paths to the error files.
noVoicesPath = Path.Combine(CoreApp.InstallPath, "Audio", "NoVoicesError.wav");
synthErrorPath = Path.Combine(CoreApp.InstallPath, "Audio", "SpeechSynthError.wav");
// Enumerate the installed voices and select the default voice.
//
// Note: The Microsoft Speech Platform voices have really clunky names like:
//
// "Microsoft Server Speech Text to Speech Voice (en-AU, Hayley)"
//
// I'm going to simplify these to be just "Microsoft <name>" and maintain
// a table that maps back to the original name.
voiceNameMap = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase);
using (var synth = new SpeechSynthesizer())
{
var voices = new Dictionary <string, VoiceInfo>(StringComparer.OrdinalIgnoreCase);
foreach (var voice in synth.GetInstalledVoices())
{
var voiceName = voice.VoiceInfo.Name;
if (!voice.Enabled)
{
continue;
}
// $hack(jeff.lill):
//
// Make sure that the voice can actually be used. I've run into
// situations where [Microsoft Anna] was present and enabled but
// could not be selected. I believe this may be a 64-bit issue
// or perhaps installing Cepstral voices messes with Anna.
try
{
synth.SelectVoice(voice.VoiceInfo.Name);
}
catch
{
continue;
}
if (voiceName.StartsWith("Microsoft Server Speech Text to Speech Voice ("))
{
int p = voiceName.IndexOf(',');
if (p != -1)
{
voiceName = voiceName.Substring(p + 1);
voiceName = "Microsoft " + voiceName.Replace(")", string.Empty).Trim();
voiceNameMap[voiceName] = voice.VoiceInfo.Name;
}
}
voices.Add(voiceName, voice.VoiceInfo);
}
SpeechEngine.InstalledVoices = voices.ToReadOnly();
SpeechEngine.DefaultVoice = null;
SpeechEngine.DefaultVoiceInfo = null;
// First see if the desired default voice exists.
if (!string.IsNullOrWhiteSpace(settings.DefaultVoice) && String.Compare(settings.DefaultVoice, "auto") != 0)
{
VoiceInfo voiceInfo;
if (voices.TryGetValue(settings.DefaultVoice, out voiceInfo))
{
SpeechEngine.DefaultVoice = voiceInfo.Name;
}
else
{
SysLog.LogWarning("[SpeechEngine] was not able to locate the requested default voice [{0}]. Another voice will be selected automatically.", settings.DefaultVoice);
}
}
// If not look for an alternative
if (SpeechEngine.DefaultVoice == null)
{
if (voices.ContainsKey("Microsoft Helen"))
{
SpeechEngine.DefaultVoice = "Microsoft Helen";
}
else if (voices.ContainsKey("Microsoft Anna"))
{
SpeechEngine.DefaultVoice = "Microsoft Anna";
}
else
{
SysLog.LogWarning("[SpeechEngine] was not able to locate the [Microsoft Anna] voice.");
var v = voices.Keys.FirstOrDefault();
if (v == null)
{
SpeechEngine.DefaultVoice = null;
SysLog.LogError("[SpeechEngine] was not able to locate any speech synthesis voices. Speech synthesis will be disabled.");
}
else
{
SpeechEngine.DefaultVoice = v;
}
}
}
if (SpeechEngine.DefaultVoice != null)
{
SpeechEngine.DefaultVoiceInfo = SpeechEngine.InstalledVoices[GetVoice(SpeechEngine.DefaultVoice)];
}
}
}
}