added SupportsExternalStream to MediaStream

MediaBrowser.Server.Implementations/Library/MediaSourceManager.cs

@@ -0,0 +1,51 @@
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.Persistence;
+using MediaBrowser.Model.Entities;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace MediaBrowser.Server.Implementations.Library
+{
+    public class MediaSourceManager : IMediaSourceManager
+    {
+        private readonly IItemRepository _itemRepo;
+
+        public MediaSourceManager(IItemRepository itemRepo)
+        {
+            _itemRepo = itemRepo;
+        }
+
+        public IEnumerable<MediaStream> GetMediaStreams(MediaStreamQuery query)
+        {
+            var list = _itemRepo.GetMediaStreams(query)
+                .ToList();
+
+            foreach (var stream in list)
+            {
+                stream.SupportsExternalStream = StreamSupportsExternalStream(stream);
+            }
+
+            return list;
+        }
+
+        private bool StreamSupportsExternalStream(MediaStream stream)
+        {
+            if (stream.IsExternal)
+            {
+                return true;
+            }
+
+            if (stream.IsTextSubtitleStream)
+            {
+                return InternalTextStreamSupportsExternalStream(stream);
+            }
+
+            return false;
+        }
+
+        private bool InternalTextStreamSupportsExternalStream(MediaStream stream)
+        {
+            return true;
+        }
+    }
+}