add new mirror mode

MediaBrowser.Model/Dto/StreamOptions.cs

@@ -158,4 +158,19 @@
         /// <value>The device id.</value>
         public string DeviceId { get; set; }
     }
+
+    public class SubtitleOptions
+    {
+        /// <summary>
+        /// Gets or sets the item identifier.
+        /// </summary>
+        /// <value>The item identifier.</value>
+        public string ItemId { get; set; }
+
+        /// <summary>
+        /// Gets or sets the index of the stream.
+        /// </summary>
+        /// <value>The index of the stream.</value>
+        public int StreamIndex { get; set; }
+    }
 }