feat: Implement TTS

Assets/Cryville.EEW.Unity/TTSWorker.cs

@@ -1,3 +1,4 @@
+using SpeechLib;
 using System;
 using System.Globalization;
 using System.Threading;
@@ -5,7 +6,14 @@ using System.Threading.Tasks;
 
 namespace Cryville.EEW.Unity {
 	class TTSWorker : Core.Audio.TTSWorker {
-		public TTSWorker() : base(CreateSoundPlayer()) { }
+		readonly SpVoiceClass _voice;
+
+		public TTSWorker() : base(CreateSoundPlayer()) {
+			try {
+				_voice = new SpVoiceClass();
+			}
+			catch { }
+		}
 
 		static SoundPlayer CreateSoundPlayer() {
 			try {
@@ -16,10 +24,24 @@ namespace Cryville.EEW.Unity {
 			}
 		}
 
-		protected override bool IsSpeaking() => false;
+		protected override bool IsSpeaking() {
+			if (_voice == null) return false;
+			_voice.GetStatus(out var status, out _);
+			return (status.dwRunningState & (uint)SpeechRunState.SRSEIsSpeaking) != 0;
+		}
 
-		protected override Task Speak(CultureInfo culture, string content, CancellationToken cancellationToken) => Task.CompletedTask;
+		protected override Task Speak(CultureInfo culture, string content, CancellationToken cancellationToken) {
+			if (_voice == null) return Task.CompletedTask;
+			_voice.Speak(
+				string.Format(CultureInfo.InvariantCulture, "<LANG LANGID=\"{0:x}\">{1}</LANG>", culture.LCID, content),
+				SpeechVoiceSpeakFlags.SVSFlagsAsync | SpeechVoiceSpeakFlags.SVSFPurgeBeforeSpeak
+			);
+			return Task.CompletedTask;
+		}
 
-		protected override void StopCurrent() { }
+		protected override void StopCurrent() {
+			if (_voice == null) return;
+			_voice.Skip("SENTENCE", int.MaxValue);
+		}
 	}
 }

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@@ -0,0 +1,76 @@
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