Added dropdown for voice selection to TextToSpeechManager.

Author: Jared Bienz

Assets/HoloToolkit/Utilities/Scripts/TextToSpeechManager.cs

@@ -7,11 +7,38 @@
 using Windows.Foundation;
 using Windows.Media.SpeechSynthesis;
 using Windows.Storage.Streams;
+using System.Linq;
 using System.Threading.Tasks;
 #endif
 
 namespace HoloToolkit.Unity
 {
+    /// <summary>
+    /// The well-know voices that can be used by <see cref="TextToSpeechManager"/>.
+    /// </summary>
+    public enum TextToSpeechVoice
+    {
+        /// <summary>
+        /// The default system voice.
+        /// </summary>
+        Default,
+
+        /// <summary>
+        /// Microsoft David Mobile
+        /// </summary>
+        David,
+
+        /// <summary>
+        /// Microsoft Mark Mobile
+        /// </summary>
+        Mark,
+
+        /// <summary>
+        /// Microsoft Zira Mobile
+        /// </summary>
+        Zira,
+    }
+
     /// <summary>
     /// Enables text to speech using the Windows 10 <see cref="SpeechSynthesizer"/> class.
     /// </summary>
@@ -29,9 +56,13 @@ public class TextToSpeechManager : MonoBehaviour
         [Tooltip("The audio source where speech will be played.")]
         public AudioSource audioSource;
 
+        [Tooltip("The voice that will be used to generate speech.")]
+        public TextToSpeechVoice voice;
+
         // Member Variables
         #if WINDOWS_UWP
         private SpeechSynthesizer synthesizer;
+        private VoiceInformation voiceInfo;
         #endif
 
         // Static Helper Methods
@@ -205,6 +236,30 @@ private void PlaySpeech(string text, Func<IAsyncOperation<SpeechSynthesisStream>
                     // This is good since it frees up Unity to keep running anyway.
                     Task.Run(async () =>
                     {
+                        // Change voice?
+                        if (voice != TextToSpeechVoice.Default)
+                        {
+                            // Get name
+                            var voiceName = Enum.GetName(typeof(TextToSpeechVoice), voice);
+
+                            // See if it's never been found or is changing
+                            if ((voiceInfo == null) || (!voiceInfo.DisplayName.Contains(voiceName)))
+                            {
+                                // Search for voice info
+                                voiceInfo = SpeechSynthesizer.AllVoices.Where(v => v.DisplayName.Contains(voiceName)).FirstOrDefault();
+
+                                // If found, select
+                                if (voiceInfo != null)
+                                {
+                                    synthesizer.Voice = voiceInfo;
+                                }
+                                else
+                                {
+                                    Debug.LogErrorFormat("TTS voice {0} could not be found.", voiceName);
+                                }
+                            }
+                        }
+
                         // Speak and get stream
                         var speechStream = await speakFunc();