2 files changed, 78 insertions, 7 deletions
diff --git a/MediaBrowser.Controller/MediaEncoding/ISubtitleEncoder.cs b/MediaBrowser.Controller/MediaEncoding/ISubtitleEncoder.cs
index 37c2bf4d2..e4a2cd007 100644
--- a/MediaBrowser.Controller/MediaEncoding/ISubtitleEncoder.cs
+++ b/MediaBrowser.Controller/MediaEncoding/ISubtitleEncoder.cs
@@ -1,4 +1,5 @@
-using System.IO;
+using MediaBrowser.Model.MediaInfo;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
 
@@ -47,8 +48,9 @@ namespace MediaBrowser.Controller.MediaEncoding
         /// Gets the subtitle language encoding parameter.
         /// </summary>
         /// <param name="path">The path.</param>
+        /// <param name="protocol">The protocol.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>System.String.</returns>
-        string GetSubtitleFileCharacterSet(string path);
-
+        Task<string> GetSubtitleFileCharacterSet(string path, MediaProtocol protocol, CancellationToken cancellationToken);
     }
 }
diff --git a/MediaBrowser.Controller/MediaEncoding/MediaStreamSelector.cs b/MediaBrowser.Controller/MediaEncoding/MediaStreamSelector.cs
index 57fddb2b1..a006a1723 100644
--- a/MediaBrowser.Controller/MediaEncoding/MediaStreamSelector.cs
+++ b/MediaBrowser.Controller/MediaEncoding/MediaStreamSelector.cs
@@ -41,8 +41,6 @@ namespace MediaBrowser.Controller.MediaEncoding
             streams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages)
                 .ToList();
 
-            var full = streams.Where(s => !s.IsForced);
-
             MediaStream stream = null;
 
             if (mode == SubtitlePlaybackMode.None)
@@ -55,13 +53,13 @@ namespace MediaBrowser.Controller.MediaEncoding
                 // if the audio language is not understood by the user, load their preferred subs, if there are any
                 if (!ContainsOrdinal(preferredLanguages, audioTrackLanguage))
                 {
-                    stream = full.FirstOrDefault(s => ContainsOrdinal(preferredLanguages, s.Language));
+                    stream = streams.Where(s => !s.IsForced).FirstOrDefault(s => ContainsOrdinal(preferredLanguages, s.Language));
                 }
             }
             else if (mode == SubtitlePlaybackMode.Always)
             {
                 // always load the most suitable full subtitles
-                stream = full.FirstOrDefault();
+                stream = streams.FirstOrDefault(s => !s.IsForced);
             }
 
             // load forced subs if we have found no suitable full subtitles
@@ -97,6 +95,77 @@ namespace MediaBrowser.Controller.MediaEncoding
                  .ThenBy(i => i.Index);
         }
 
+        public static void SetSubtitleStreamScores(List<MediaStream> streams,
+            List<string> preferredLanguages,
+            SubtitlePlaybackMode mode,
+            string audioTrackLanguage)
+        {
+            if (mode == SubtitlePlaybackMode.None)
+            {
+                return;
+            }
+
+            streams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages)
+                .ToList();
+
+            var filteredStreams = new List<MediaStream>();
+
+            if (mode == SubtitlePlaybackMode.Default)
+            {
+                // if the audio language is not understood by the user, load their preferred subs, if there are any
+                if (!ContainsOrdinal(preferredLanguages, audioTrackLanguage))
+                {
+                    filteredStreams = streams.Where(s => !s.IsForced && ContainsOrdinal(preferredLanguages, s.Language))
+                        .ToList();
+                }
+            }
+            else if (mode == SubtitlePlaybackMode.Always)
+            {
+                // always load the most suitable full subtitles
+                filteredStreams = streams.Where(s => !s.IsForced)
+                    .ToList();
+            }
+
+            // load forced subs if we have found no suitable full subtitles
+            if (filteredStreams.Count == 0)
+            {
+                filteredStreams = streams
+                    .Where(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
+                    .ToList();
+            }
+
+            foreach (var stream in filteredStreams)
+            {
+                stream.Score = GetSubtitleScore(stream, preferredLanguages);
+            }
+        }
+
+        private static int GetSubtitleScore(MediaStream stream, List<string> languagePreferences)
+        {
+            var values = new List<int>();
+
+            var index = languagePreferences.FindIndex(l => string.Equals(stream.Language, l, StringComparison.OrdinalIgnoreCase));
+
+            values.Add(index == -1 ? 0 : 100 - index);
+
+            values.Add(stream.IsDefault ? 1 : 0);
+            values.Add(stream.SupportsExternalStream ? 1 : 0);
+            values.Add(stream.IsTextSubtitleStream ? 1 : 0);
+            values.Add(stream.IsExternal ? 1 : 0);
+
+            values.Reverse();
+            var scale = 1;
+            var score = 0;
+
+            foreach (var value in values)
+            {
+                score += scale * (value + 1);
+                scale *= 10;
+            }
+
+            return score;
+        }
+
         private static int GetBooleanOrderBy(bool value)
         {
             return value ? 0 : 1;