EventId Property
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SpeechEventInfo.EventId Property

 

Gets and set the Speech platform event which an instance of SpeechEventInfo is used to request.

Namespace:   System.Speech.Synthesis.TtsEngine
Assembly:  System.Speech (in System.Speech.dll)

public short EventId { get; internal set; }

Property Value

Type: System.Int16

Returns a member of TtsEventId as a short, indicating the event type the SpeechEventInfo object is to generate.

The example below is part of a custom speech synthesis implementation inheriting from TtsEngineSsml, and using the use of TextFragment, SpeechEventInfo, FragmentState, and T:System.Speech.Synthesis.TtsEngine.TtsEventID

The implementation of M:System.Speech.Synthesis.TtsEngine.TtsEngineSsml.Speak

  1. Receives an array of TextFragment instances and creates a new array of TextFragment instances to be passed to the Speak method on an underlying synthesis engine.

  2. If the TtsEngineAction enumeration value by found from the Action property on the FragmentState returned by the State property of each TextFragment instance is Speak, the implementation

    • Translates Americanism to Britishisms in the text to be spoken.

    • If the EventInterest property on the ITtsEngineSite interfaces provided to the implementation support the WordBoundary event type, a SpeechEventInfo instance is used to create an event to drive a synthesizer progress meter is created.

      The parameters on SpeechEventInfo, including EventId are used to log the event generated through the LogSpeechEvent method.

  3. A speech rendering engine is then called with the modified TextFragment array.

private const int WordBoundaryFlag = 1 << (int)TtsEventId.WordBoundary;
private readonly char[] spaces = new char[] { ' ', '\t', '\r', '\n' };
internal struct UsVsUk
{
  internal string UK;
  internal string US;
}

override public void Speak (TextFragment [] frags, IntPtr wfx, ITtsEngineSite site)
{
  TextFragment [] newFrags=new TextFragment[frags.Length];

  for (int i=0;i<frags.Length;i++){
    newFrags[i].State=frags[i].State;
    //truncate
    newFrags[i].TextToSpeak = frags[i].TextToSpeak.Substring(frags[i].TextOffset,
                               frags[i].TextLength);
    newFrags[i].TextLength = newFrags[i].TextToSpeak.Length;
    newFrags[i].TextOffset = 0;
    if (newFrags[i].State.Action == TtsEngineAction.Speak) {
      //Us to UK conversion
      foreach (UsVsUk term in TransList) {
      newFrags[i].TextToSpeak.Replace(term.US, term.UK);
      }
      //Generate progress meter events if supported
      if ((site.EventInterest & WordBoundaryFlag) != 0) {
      string[] subs = newFrags[i].TextToSpeak.Split(spaces);

      foreach (string s in subs) {
        int offset = newFrags[i].TextOffset;
        SpeechEventInfo spEvent = new SpeechEventInfo((Int16)TtsEventId.WordBoundary, 
                (Int16)EventParameterType.Undefined, 
                 s.Length, new IntPtr(offset));
         LogSpeechEvent(spEvent.EventId, 
                        spEvent.ParameterType, 
                        spEvent.Param1,
                        spEvent.Param2);
        offset += s.Length;
        if (s.Trim().Length > 0) {
          SpeechEventInfo[] events = new SpeechEventInfo[1];
          events[0] = spEvent;
          site.AddEvents(events, 1);
        }
      }
      }
    }
  }

  _baseSynthesize.Speak(newFrags, wfx, site);

}

.NET Framework
Available since 3.0
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