implement modular media sources

MediaBrowser.Controller/Library/IMediaSourceProvider.cs

@@ -15,5 +15,21 @@ namespace MediaBrowser.Controller.Library
         /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>Task&lt;IEnumerable&lt;MediaSourceInfo&gt;&gt;.</returns>
         Task<IEnumerable<MediaSourceInfo>> GetMediaSources(IHasMediaSources item, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Opens the media source.
+        /// </summary>
+        /// <param name="openKey">The open key.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task&lt;MediaSourceInfo&gt;.</returns>
+        Task<MediaSourceInfo> OpenMediaSource(string openKey, CancellationToken cancellationToken);
+
+        /// <summary>
+        /// Closes the media source.
+        /// </summary>
+        /// <param name="closeKey">The close key.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        Task CloseMediaSource(string closeKey, CancellationToken cancellationToken);
     }
 }