//---------------------------------------------------------------------
// Static members
/// <summary>
/// Reads the text-to-speech engine from the application's configuration
/// using the specified key prefix.
/// </summary>
/// <param name="keyPrefix">The application configuration key prefix.</param>
/// <returns>The settings.</returns>
/// <remarks>
/// <para>
/// The text-to-speech engine settings are loaded from the application
/// configuration, using the specified key prefix. The following
/// settings are recognized by the class:
/// </para>
/// <div class="tablediv">
/// <table class="dtTABLE" cellspacing="0" ID="Table1">
/// <tr valign="top">
/// <th width="1">Setting</th>
/// <th width="1">Default</th>
/// <th width="90%">Description</th>
/// </tr>
/// <tr valign="top">
/// <td>PhraseCacheFolder</td>
/// <td><b>$(ProgramDataPath)\LillTek\NeonSwitch\PhraseCache</b></td>
/// <td>
/// The fully qualified path to the file system folder where the cache will be located.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>OneTimePhraseFolder</td>
/// <td><b>$(ProgramDataPath)\LillTek\NeonSwitch\PhraseCache\OneTime</b></td>
/// <td>
/// The fully qualified path to the file system folder where one-time
/// phrases will be located while they are played by NeonSwitch.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>PhraseFolderFanout</td>
/// <td><b>100</b></td>
/// <td>
/// Specifies the number of subfolders to create in the cache. Cached audio
/// files will be distributed randomly across these folders to avoid having a huge
/// number of files in any one folder.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>PhrasePurgeInterval</td>
/// <td><b>1m</b></td>
/// <td>
/// The time interval at which temporary phrases as well as phrases that
/// have not been referenced for some period of time will be purged.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>MaxPhraseTTL</td>
/// <td><b>1d</b></td>
/// <td>
/// The maximum time a phrase will be cached if it is not used.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>MaxOneTimePhraseTTL</td>
/// <td><b>5m</b></td>
/// <td>
/// The maximum time a one-time phrase audio file will be retained.
/// </td>
/// </tr>
/// <tr valign="top">
/// <td>DefaultVoice</td>
/// <td><b>auto</b></td>
/// <td>
/// <para>
/// The default speech synthesis voice. This defaults to <b>auto</b>
/// which has the switch choose the voice depending on which voices are
/// currently installed.
/// </para>
/// <para>
/// NeonSwitch will favor Cepstral 8KHz voices if present, especially
/// <b>Cepstral Allison-8kHz</b> but fall back to <b>Microsoft Anna</b>
/// which should be present on all Windows machines.
/// </para>
/// </td>
/// </tr>
/// </table>
/// </div>
/// </remarks>
public static SpeechEngineSettings LoadConfig(string keyPrefix)
{
var config = new Config(keyPrefix);
var settings = new SpeechEngineSettings();
settings.PhraseCacheFolder = config.Get("PhraseCacheFolder", settings.PhraseCacheFolder);
settings.OneTimePhraseFolder = config.Get("OneTimePhraseFolder", settings.OneTimePhraseFolder);
settings.PhraseFolderFanout = config.Get("PhraseFolderFanout", settings.PhraseFolderFanout);
settings.PhrasePurgeInterval = config.Get("PhrasePurgeInterval", settings.PhrasePurgeInterval);
settings.MaxPhraseTTL = config.Get("MaxPhraseTTL", settings.MaxPhraseTTL);
settings.MaxOneTimePhraseTTL = config.Get("MaxOneTimePhraseTTL", settings.MaxOneTimePhraseTTL);
settings.DefaultVoice = config.Get("DefaultVoice", settings.DefaultVoice);
return(settings);
}
/// <summary>
/// Constructs and initializes the phrase cache using TTS engine
/// settings passed.
/// </summary>
/// <param name="settings">The engine settings.</param>
public PhraseCache(SpeechEngineSettings settings)
{
this.settings = settings;
this.isRunning = true;
this.index = new Dictionary <string, Phrase>();
this.purgeTimer = new PolledTimer(settings.PhrasePurgeInterval, true);
this.oneTimePurgeTimer = new PolledTimer(Helper.Divide(settings.MaxOneTimePhraseTTL, 2));
// Make sure the cache folders exist.
Helper.CreateFolderTree(settings.PhraseCacheFolder);
Helper.CreateFolderTree(settings.OneTimePhraseFolder);
for (int i = 0; i < settings.PhraseFolderFanout; i++)
{
Helper.CreateFolderTree(Path.Combine(settings.PhraseCacheFolder, GetSubfolderName(i)));
}
// Initialize the cache.
PurgeOneTime();
LoadIndex();
}
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)];
}
}
}
}
/// <summary>
/// Starts the service, associating it with an <see cref="IServiceHost" /> instance.
/// </summary>
/// <param name="serviceHost">The service user interface.</param>
/// <param name="args">Command line arguments.</param>
public void Start(IServiceHost serviceHost, string[] args)
{
lock (syncLock)
{
if (router != null)
{
return; // Already started
}
// Global initialization
startTime = DateTime.UtcNow;
NetTrace.Start();
CoreApp.InstallPerfCounters();
// Service initialization
this.serviceHost = serviceHost;
try
{
SysLog.LogInformation("NeonSwitch v{0} Start", Helper.GetVersionString());
router = new LeafRouter();
router.Start();
state = ServiceState.Running;
bkTimer = new GatedTimer(OnBkTimer, null, CoreApp.BkTaskInterval);
SpeechEngine.Start(SpeechEngineSettings.LoadConfig("NeonSwitch.Speech"));
#if DEBUG
// $todo(jeff.lill): Delete this.
SwitchTest.Test();
#endif
// Indicate that the switch core service is open for business. NeonSwitch
// application instance loaders will spin, waiting for this to be set before
// calling the application's main function.
Switch.SetGlobal(SwitchGlobal.NeonSwitchReady, "true");
}
catch (Exception e)
{
SpeechEngine.Stop();
if (bkTimer != null)
{
bkTimer.Dispose();
bkTimer = null;
}
if (router != null)
{
router.Stop();
router = null;
}
SysLog.LogException(e);
throw;
}
}
}