more work on channel downloading

MediaBrowser.Model/Dto/MediaSourceInfo.cs

@@ -12,6 +12,8 @@ namespace MediaBrowser.Model.Dto
 
         public string Path { get; set; }
 
+        public MediaSourceType Type { get; set; }
+
         public string Container { get; set; }
         public long? Size { get; set; }
 
@@ -101,4 +103,11 @@ namespace MediaBrowser.Model.Dto
             }
         }
     }
+
+    public enum MediaSourceType
+    {
+        Default = 0,
+        Grouping = 1,
+        Cache = 2
+    }
 }