add open subtitle option to only download subtitles that are a perfect match

MediaBrowser.Controller/Subtitles/SubtitleSearchRequest.cs

@@ -19,6 +19,7 @@ namespace MediaBrowser.Controller.Subtitles
         public int? ParentIndexNumber { get; set; }
         public int? ProductionYear { get; set; }
         public long? RuntimeTicks { get; set; }
+        public bool IsPerfectMatch { get; set; }
         public Dictionary<string, string> ProviderIds { get; set; }
 
         public bool SearchAllProviders { get; set; }

MediaBrowser.Model/Providers/SubtitleOptions.cs

@@ -12,11 +12,14 @@ namespace MediaBrowser.Model.Providers
         public string OpenSubtitlesPasswordHash { get; set; }
         public bool IsOpenSubtitleVipAccount { get; set; }
 
+        public bool RequirePerfectMatch { get; set; }
+
         public SubtitleOptions()
         {
             DownloadLanguages = new string[] { };
 
             SkipIfAudioTrackMatches = true;
+            RequirePerfectMatch = true;
         }
     }
 }

MediaBrowser.Providers/MediaInfo/FFProbeVideoInfo.cs

@@ -532,6 +532,7 @@ namespace MediaBrowser.Providers.MediaInfo
                     currentStreams.Concat(externalSubtitleStreams).ToList(),
                     subtitleOptions.SkipIfEmbeddedSubtitlesPresent,
                     subtitleOptions.SkipIfAudioTrackMatches,
+                    subtitleOptions.RequirePerfectMatch,
                     subtitleOptions.DownloadLanguages,
                     cancellationToken).ConfigureAwait(false);
 

MediaBrowser.Providers/MediaInfo/SubtitleDownloader.cs

@@ -28,6 +28,7 @@ namespace MediaBrowser.Providers.MediaInfo
             List<MediaStream> mediaStreams,
             bool skipIfEmbeddedSubtitlesPresent,
             bool skipIfAudioTrackMatches,
+            bool requirePerfectMatch,
             IEnumerable<string> languages,
             CancellationToken cancellationToken)
         {
@@ -59,7 +60,7 @@ namespace MediaBrowser.Providers.MediaInfo
             {
                 try
                 {
-                    var downloaded = await DownloadSubtitles(video, mediaStreams, skipIfEmbeddedSubtitlesPresent, skipIfAudioTrackMatches, lang, mediaType, cancellationToken)
+                    var downloaded = await DownloadSubtitles(video, mediaStreams, skipIfEmbeddedSubtitlesPresent, skipIfAudioTrackMatches, requirePerfectMatch, lang, mediaType, cancellationToken)
                         .ConfigureAwait(false);
 
                     if (downloaded)
@@ -80,6 +81,7 @@ namespace MediaBrowser.Providers.MediaInfo
             List<MediaStream> mediaStreams,
             bool skipIfEmbeddedSubtitlesPresent,
             bool skipIfAudioTrackMatches,
+            bool requirePerfectMatch,
             string language,
             VideoContentType mediaType,
             CancellationToken cancellationToken)
@@ -125,7 +127,9 @@ namespace MediaBrowser.Providers.MediaInfo
                 ProviderIds = video.ProviderIds,
 
                 // Stop as soon as we find something
-                SearchAllProviders = false
+                SearchAllProviders = false,
+
+                IsPerfectMatch = requirePerfectMatch
             };
 
             var episode = video as Episode;

MediaBrowser.Providers/MediaInfo/SubtitleScheduledTask.cs

@@ -116,6 +116,7 @@ namespace MediaBrowser.Providers.MediaInfo
                     mediaStreams,
                     options.SkipIfEmbeddedSubtitlesPresent,
                     options.SkipIfAudioTrackMatches,
+                    options.RequirePerfectMatch,
                     options.DownloadLanguages,
                     cancellationToken).ConfigureAwait(false);
 

MediaBrowser.Providers/Subtitles/OpenSubtitleDownloader.cs

@@ -308,8 +308,8 @@ namespace MediaBrowser.Providers.Subtitles
             // Avoid implicitly captured closure
             var hasCopy = hash;
 
-            return results.Where(x => x.SubBad == "0" && mediaFilter(x))
-                    .OrderBy(x => (x.MovieHash == hash ? 0 : 1))
+            return results.Where(x => x.SubBad == "0" && mediaFilter(x) && (!request.IsPerfectMatch || string.Equals(x.MovieHash, hash, StringComparison.OrdinalIgnoreCase)))
+                    .OrderBy(x => (string.Equals(x.MovieHash, hash, StringComparison.OrdinalIgnoreCase) ? 0 : 1))
                     .ThenBy(x => Math.Abs(long.Parse(x.MovieByteSize, _usCulture) - movieByteSize))
                     .ThenByDescending(x => int.Parse(x.SubDownloadsCnt, _usCulture))
                     .ThenByDescending(x => double.Parse(x.SubRating, _usCulture))