Merge pull request #6096 from cvium/saving_private_ram

Emby.Naming/TV/EpisodeResolver.cs

@@ -16,7 +16,7 @@ namespace Emby.Naming.TV
         /// <summary>
         /// Initializes a new instance of the <see cref="EpisodeResolver"/> class.
         /// </summary>
-        /// <param name="options"><see cref="NamingOptions"/> object containing VideoFileExtensions and passed to <see cref="StubResolver"/>, <see cref="FlagParser"/>, <see cref="Format3DParser"/> and <see cref="EpisodePathParser"/>.</param>
+        /// <param name="options"><see cref="NamingOptions"/> object containing VideoFileExtensions and passed to <see cref="StubResolver"/>, <see cref="Format3DParser"/> and <see cref="EpisodePathParser"/>.</param>
         public EpisodeResolver(NamingOptions options)
         {
             _options = options;
@@ -62,8 +62,7 @@ namespace Emby.Naming.TV
                 container = extension.TrimStart('.');
             }
 
-            var flags = new FlagParser(_options).GetFlags(path);
-            var format3DResult = new Format3DParser(_options).Parse(flags);
+            var format3DResult = Format3DParser.Parse(path, _options);
 
             var parsingResult = new EpisodePathParser(_options)
                 .Parse(path, isDirectory, isNamed, isOptimistic, supportsAbsoluteNumbers, fillExtendedInfo);

Emby.Naming/Video/ExtraResolver.cs

@@ -44,7 +44,7 @@ namespace Emby.Naming.Video
                 }
                 else if (rule.MediaType == MediaType.Video)
                 {
-                    if (!new VideoResolver(_options).IsVideoFile(path))
+                    if (!VideoResolver.IsVideoFile(path, _options))
                     {
                         continue;
                     }

Emby.Naming/Video/FlagParser.cs

@@ -1,53 +0,0 @@
-using System;
-using System.IO;
-using Emby.Naming.Common;
-
-namespace Emby.Naming.Video
-{
-    /// <summary>
-    /// Parses list of flags from filename based on delimiters.
-    /// </summary>
-    public class FlagParser
-    {
-        private readonly NamingOptions _options;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="FlagParser"/> class.
-        /// </summary>
-        /// <param name="options"><see cref="NamingOptions"/> object containing VideoFlagDelimiters.</param>
-        public FlagParser(NamingOptions options)
-        {
-            _options = options;
-        }
-
-        /// <summary>
-        /// Calls GetFlags function with _options.VideoFlagDelimiters parameter.
-        /// </summary>
-        /// <param name="path">Path to file.</param>
-        /// <returns>List of found flags.</returns>
-        public string[] GetFlags(string path)
-        {
-            return GetFlags(path, _options.VideoFlagDelimiters);
-        }
-
-        /// <summary>
-        /// Parses flags from filename based on delimiters.
-        /// </summary>
-        /// <param name="path">Path to file.</param>
-        /// <param name="delimiters">Delimiters used to extract flags.</param>
-        /// <returns>List of found flags.</returns>
-        public string[] GetFlags(string path, char[] delimiters)
-        {
-            if (string.IsNullOrEmpty(path))
-            {
-                return Array.Empty<string>();
-            }
-
-            // Note: the tags need be be surrounded be either a space ( ), hyphen -, dot . or underscore _.
-
-            var file = Path.GetFileName(path);
-
-            return file.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
-        }
-    }
-}

Emby.Naming/Video/Format3DParser.cs

@@ -1,45 +1,37 @@
 using System;
-using System.Linq;
 using Emby.Naming.Common;
 
 namespace Emby.Naming.Video
 {
     /// <summary>
-    /// Parste 3D format related flags.
+    /// Parse 3D format related flags.
     /// </summary>
-    public class Format3DParser
+    public static class Format3DParser
     {
-        private readonly NamingOptions _options;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Format3DParser"/> class.
-        /// </summary>
-        /// <param name="options"><see cref="NamingOptions"/> object containing VideoFlagDelimiters and passes options to <see cref="FlagParser"/>.</param>
-        public Format3DParser(NamingOptions options)
-        {
-            _options = options;
-        }
+        // Static default result to save on allocation costs.
+        private static readonly Format3DResult _defaultResult = new (false, null);
 
         /// <summary>
         /// Parse 3D format related flags.
         /// </summary>
         /// <param name="path">Path to file.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>Returns <see cref="Format3DResult"/> object.</returns>
-        public Format3DResult Parse(string path)
+        public static Format3DResult Parse(ReadOnlySpan<char> path, NamingOptions namingOptions)
         {
-            int oldLen = _options.VideoFlagDelimiters.Length;
-            var delimiters = new char[oldLen + 1];
-            _options.VideoFlagDelimiters.CopyTo(delimiters, 0);
+            int oldLen = namingOptions.VideoFlagDelimiters.Length;
+            Span<char> delimiters = stackalloc char[oldLen + 1];
+            namingOptions.VideoFlagDelimiters.AsSpan().CopyTo(delimiters);
             delimiters[oldLen] = ' ';
 
-            return Parse(new FlagParser(_options).GetFlags(path, delimiters));
+            return Parse(path, delimiters, namingOptions);
         }
 
-        internal Format3DResult Parse(string[] videoFlags)
+        private static Format3DResult Parse(ReadOnlySpan<char> path, ReadOnlySpan<char> delimiters, NamingOptions namingOptions)
         {
-            foreach (var rule in _options.Format3DRules)
+            foreach (var rule in namingOptions.Format3DRules)
             {
-                var result = Parse(videoFlags, rule);
+                var result = Parse(path, rule, delimiters);
 
                 if (result.Is3D)
                 {
@@ -47,51 +39,43 @@ namespace Emby.Naming.Video
                 }
             }
 
-            return new Format3DResult();
+            return _defaultResult;
         }
 
-        private static Format3DResult Parse(string[] videoFlags, Format3DRule rule)
+        private static Format3DResult Parse(ReadOnlySpan<char> path, Format3DRule rule, ReadOnlySpan<char> delimiters)
         {
-            var result = new Format3DResult();
+            bool is3D = false;
+            string? format3D = null;
 
-            if (string.IsNullOrEmpty(rule.PrecedingToken))
+            // If there's no preceding token we just consider it found
+            var foundPrefix = string.IsNullOrEmpty(rule.PrecedingToken);
+            while (path.Length > 0)
             {
-                result.Format3D = new[] { rule.Token }.FirstOrDefault(i => videoFlags.Contains(i, StringComparer.OrdinalIgnoreCase));
-                result.Is3D = !string.IsNullOrEmpty(result.Format3D);
-
-                if (result.Is3D)
+                var index = path.IndexOfAny(delimiters);
+                if (index == -1)
                 {
-                    result.Tokens.Add(rule.Token);
+                    index = path.Length - 1;
                 }
-            }
-            else
-            {
-                var foundPrefix = false;
-                string? format = null;
 
-                foreach (var flag in videoFlags)
-                {
-                    if (foundPrefix)
-                    {
-                        result.Tokens.Add(rule.PrecedingToken);
+                var currentSlice = path[..index];
+                path = path[(index + 1)..];
 
-                        if (string.Equals(rule.Token, flag, StringComparison.OrdinalIgnoreCase))
-                        {
-                            format = flag;
-                            result.Tokens.Add(rule.Token);
-                        }
+                if (!foundPrefix)
+                {
+                    foundPrefix = currentSlice.Equals(rule.PrecedingToken, StringComparison.OrdinalIgnoreCase);
+                    continue;
+                }
 
-                        break;
-                    }
+                is3D = foundPrefix && currentSlice.Equals(rule.Token, StringComparison.OrdinalIgnoreCase);
 
-                    foundPrefix = string.Equals(flag, rule.PrecedingToken, StringComparison.OrdinalIgnoreCase);
+                if (is3D)
+                {
+                    format3D = rule.Token;
+                    break;
                 }
-
-                result.Is3D = foundPrefix && !string.IsNullOrEmpty(format);
-                result.Format3D = format;
             }
 
-            return result;
+            return is3D ? new Format3DResult(true, format3D) : _defaultResult;
         }
     }
 }

Emby.Naming/Video/Format3DResult.cs

@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 namespace Emby.Naming.Video
 {
     /// <summary>
@@ -10,27 +8,24 @@ namespace Emby.Naming.Video
         /// <summary>
         /// Initializes a new instance of the <see cref="Format3DResult"/> class.
         /// </summary>
-        public Format3DResult()
+        /// <param name="is3D">A value indicating whether the parsed string contains 3D tokens.</param>
+        /// <param name="format3D">The 3D format. Value might be null if [is3D] is <c>false</c>.</param>
+        public Format3DResult(bool is3D, string? format3D)
         {
-            Tokens = new List<string>();
+            Is3D = is3D;
+            Format3D = format3D;
         }
 
         /// <summary>
-        /// Gets or sets a value indicating whether [is3 d].
+        /// Gets a value indicating whether [is3 d].
         /// </summary>
         /// <value><c>true</c> if [is3 d]; otherwise, <c>false</c>.</value>
-        public bool Is3D { get; set; }
+        public bool Is3D { get; }
 
         /// <summary>
-        /// Gets or sets the format3 d.
+        /// Gets the format3 d.
         /// </summary>
         /// <value>The format3 d.</value>
-        public string? Format3D { get; set; }
-
-        /// <summary>
-        /// Gets or sets the tokens.
-        /// </summary>
-        /// <value>The tokens.</value>
-        public List<string> Tokens { get; set; }
+        public string? Format3D { get; }
     }
 }

Emby.Naming/Video/StackResolver.cs

@@ -85,10 +85,8 @@ namespace Emby.Naming.Video
         /// <returns>Enumerable <see cref="FileStack"/> of videos.</returns>
         public IEnumerable<FileStack> Resolve(IEnumerable<FileSystemMetadata> files)
         {
-            var resolver = new VideoResolver(_options);
-
             var list = files
-                .Where(i => i.IsDirectory || resolver.IsVideoFile(i.FullName) || resolver.IsStubFile(i.FullName))
+                .Where(i => i.IsDirectory || VideoResolver.IsVideoFile(i.FullName, _options) || VideoResolver.IsStubFile(i.FullName, _options))
                 .OrderBy(i => i.FullName)
                 .ToList();
 

Emby.Naming/Video/VideoFileInfo.cs

@@ -1,3 +1,4 @@
+using System;
 using MediaBrowser.Model.Entities;
 
 namespace Emby.Naming.Video
@@ -106,9 +107,9 @@ namespace Emby.Naming.Video
         /// Gets the file name without extension.
         /// </summary>
         /// <value>The file name without extension.</value>
-        public string FileNameWithoutExtension => !IsDirectory
-            ? System.IO.Path.GetFileNameWithoutExtension(Path)
-            : System.IO.Path.GetFileName(Path);
+        public ReadOnlySpan<char> FileNameWithoutExtension => !IsDirectory
+            ? System.IO.Path.GetFileNameWithoutExtension(Path.AsSpan())
+            : System.IO.Path.GetFileName(Path.AsSpan());
 
         /// <inheritdoc />
         public override string ToString()

Emby.Naming/Video/VideoListResolver.cs

@@ -12,31 +12,19 @@ namespace Emby.Naming.Video
     /// <summary>
     /// Resolves alternative versions and extras from list of video files.
     /// </summary>
-    public class VideoListResolver
+    public static class VideoListResolver
     {
-        private readonly NamingOptions _options;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="VideoListResolver"/> class.
-        /// </summary>
-        /// <param name="options"><see cref="NamingOptions"/> object containing CleanStringRegexes and VideoFlagDelimiters and passes options to <see cref="StackResolver"/> and <see cref="VideoResolver"/>.</param>
-        public VideoListResolver(NamingOptions options)
-        {
-            _options = options;
-        }
-
         /// <summary>
         /// Resolves alternative versions and extras from list of video files.
         /// </summary>
         /// <param name="files">List of related video files.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <param name="supportMultiVersion">Indication we should consider multi-versions of content.</param>
         /// <returns>Returns enumerable of <see cref="VideoInfo"/> which groups files together when related.</returns>
-        public IEnumerable<VideoInfo> Resolve(List<FileSystemMetadata> files, bool supportMultiVersion = true)
+        public static IEnumerable<VideoInfo> Resolve(List<FileSystemMetadata> files, NamingOptions namingOptions, bool supportMultiVersion = true)
         {
-            var videoResolver = new VideoResolver(_options);
-
             var videoInfos = files
-                .Select(i => videoResolver.Resolve(i.FullName, i.IsDirectory))
+                .Select(i => VideoResolver.Resolve(i.FullName, i.IsDirectory, namingOptions))
                 .OfType<VideoFileInfo>()
                 .ToList();
 
@@ -46,7 +34,7 @@ namespace Emby.Naming.Video
                 .Where(i => i.ExtraType == null)
                 .Select(i => new FileSystemMetadata { FullName = i.Path, IsDirectory = i.IsDirectory });
 
-            var stackResult = new StackResolver(_options)
+            var stackResult = new StackResolver(namingOptions)
                 .Resolve(nonExtras).ToList();
 
             var remainingFiles = videoInfos
@@ -59,23 +47,17 @@ namespace Emby.Naming.Video
             {
                 var info = new VideoInfo(stack.Name)
                 {
-                    Files = stack.Files.Select(i => videoResolver.Resolve(i, stack.IsDirectoryStack))
+                    Files = stack.Files.Select(i => VideoResolver.Resolve(i, stack.IsDirectoryStack, namingOptions))
                         .OfType<VideoFileInfo>()
                         .ToList()
                 };
 
                 info.Year = info.Files[0].Year;
 
-                var extraBaseNames = new List<string> { stack.Name, Path.GetFileNameWithoutExtension(stack.Files[0]) };
-
-                var extras = GetExtras(remainingFiles, extraBaseNames);
+                var extras = ExtractExtras(remainingFiles, stack.Name, Path.GetFileNameWithoutExtension(stack.Files[0].AsSpan()), namingOptions.VideoFlagDelimiters);
 
                 if (extras.Count > 0)
                 {
-                    remainingFiles = remainingFiles
-                        .Except(extras)
-                        .ToList();
-
                     info.Extras = extras;
                 }
 
@@ -88,15 +70,12 @@ namespace Emby.Naming.Video
 
             foreach (var media in standaloneMedia)
             {
-                var info = new VideoInfo(media.Name) { Files = new List<VideoFileInfo> { media } };
+                var info = new VideoInfo(media.Name) { Files = new[] { media } };
 
                 info.Year = info.Files[0].Year;
 
-                var extras = GetExtras(remainingFiles, new List<string> { media.FileNameWithoutExtension });
-
-                remainingFiles = remainingFiles
-                    .Except(extras.Concat(new[] { media }))
-                    .ToList();
+                remainingFiles.Remove(media);
+                var extras = ExtractExtras(remainingFiles, media.FileNameWithoutExtension, namingOptions.VideoFlagDelimiters);
 
                 info.Extras = extras;
 
@@ -105,8 +84,7 @@ namespace Emby.Naming.Video
 
             if (supportMultiVersion)
             {
-                list = GetVideosGroupedByVersion(list)
-                    .ToList();
+                list = GetVideosGroupedByVersion(list, namingOptions);
             }
 
             // If there's only one resolved video, use the folder name as well to find extras
@@ -114,19 +92,14 @@ namespace Emby.Naming.Video
             {
                 var info = list[0];
                 var videoPath = list[0].Files[0].Path;
-                var parentPath = Path.GetDirectoryName(videoPath);
+                var parentPath = Path.GetDirectoryName(videoPath.AsSpan());
 
-                if (!string.IsNullOrEmpty(parentPath))
+                if (!parentPath.IsEmpty)
                 {
                     var folderName = Path.GetFileName(parentPath);
-                    if (!string.IsNullOrEmpty(folderName))
+                    if (!folderName.IsEmpty)
                     {
-                        var extras = GetExtras(remainingFiles, new List<string> { folderName });
-
-                        remainingFiles = remainingFiles
-                            .Except(extras)
-                            .ToList();
-
+                        var extras = ExtractExtras(remainingFiles, folderName, namingOptions.VideoFlagDelimiters);
                         extras.AddRange(info.Extras);
                         info.Extras = extras;
                     }
@@ -164,96 +137,168 @@ namespace Emby.Naming.Video
             // Whatever files are left, just add them
             list.AddRange(remainingFiles.Select(i => new VideoInfo(i.Name)
             {
-                Files = new List<VideoFileInfo> { i },
+                Files = new[] { i },
                 Year = i.Year
             }));
 
             return list;
         }
 
-        private IEnumerable<VideoInfo> GetVideosGroupedByVersion(List<VideoInfo> videos)
+        private static List<VideoInfo> GetVideosGroupedByVersion(List<VideoInfo> videos, NamingOptions namingOptions)
         {
             if (videos.Count == 0)
             {
                 return videos;
             }
 
-            var list = new List<VideoInfo>();
-
-            var folderName = Path.GetFileName(Path.GetDirectoryName(videos[0].Files[0].Path));
+            var folderName = Path.GetFileName(Path.GetDirectoryName(videos[0].Files[0].Path.AsSpan()));
 
-            if (!string.IsNullOrEmpty(folderName)
-                && folderName.Length > 1
-                && videos.All(i => i.Files.Count == 1
-                    && IsEligibleForMultiVersion(folderName, i.Files[0].Path))
-                    && HaveSameYear(videos))
+            if (folderName.Length <= 1 || !HaveSameYear(videos))
             {
-                var ordered = videos.OrderBy(i => i.Name).ToList();
-
-                list.Add(ordered[0]);
+                return videos;
+            }
 
-                var alternateVersionsLen = ordered.Count - 1;
-                var alternateVersions = new VideoFileInfo[alternateVersionsLen];
-                for (int i = 0; i < alternateVersionsLen; i++)
+            // Cannot use Span inside local functions and delegates thus we cannot use LINQ here nor merge with the above [if]
+            for (var i = 0; i < videos.Count; i++)
+            {
+                var video = videos[i];
+                if (!IsEligibleForMultiVersion(folderName, video.Files[0].Path, namingOptions))
                 {
-                    alternateVersions[i] = ordered[i + 1].Files[0];
+                    return videos;
                 }
+            }
+
+            // The list is created and overwritten in the caller, so we are allowed to do in-place sorting
+            videos.Sort((x, y) => string.Compare(x.Name, y.Name, StringComparison.Ordinal));
 
-                list[0].AlternateVersions = alternateVersions;
-                list[0].Name = folderName;
-                var extras = ordered.Skip(1).SelectMany(i => i.Extras).ToList();
-                extras.AddRange(list[0].Extras);
-                list[0].Extras = extras;
+            var list = new List<VideoInfo>
+            {
+                videos[0]
+            };
 
-                return list;
+            var alternateVersionsLen = videos.Count - 1;
+            var alternateVersions = new VideoFileInfo[alternateVersionsLen];
+            var extras = new List<VideoFileInfo>(list[0].Extras);
+            for (int i = 0; i < alternateVersionsLen; i++)
+            {
+                var video = videos[i + 1];
+                alternateVersions[i] = video.Files[0];
+                extras.AddRange(video.Extras);
             }
 
-            return videos;
-        }
+            list[0].AlternateVersions = alternateVersions;
+            list[0].Name = folderName.ToString();
+            list[0].Extras = extras;
 
-        private bool HaveSameYear(List<VideoInfo> videos)
-        {
-            return videos.Select(i => i.Year ?? -1).Distinct().Count() < 2;
+            return list;
         }
 
-        private bool IsEligibleForMultiVersion(string folderName, string testFilePath)
+        private static bool HaveSameYear(IReadOnlyList<VideoInfo> videos)
         {
-            string testFilename = Path.GetFileNameWithoutExtension(testFilePath);
-            if (testFilename.StartsWith(folderName, StringComparison.OrdinalIgnoreCase))
+            if (videos.Count == 1)
             {
-                // Remove the folder name before cleaning as we don't care about cleaning that part
-                if (folderName.Length <= testFilename.Length)
-                {
-                    testFilename = testFilename.Substring(folderName.Length).Trim();
-                }
+                return true;
+            }
 
-                if (CleanStringParser.TryClean(testFilename, _options.CleanStringRegexes, out var cleanName))
+            var firstYear = videos[0].Year ?? -1;
+            for (var i = 1; i < videos.Count; i++)
+            {
+                if ((videos[i].Year ?? -1) != firstYear)
                 {
-                    testFilename = cleanName.Trim().ToString();
+                    return false;
                 }
+            }
 
-                // The CleanStringParser should have removed common keywords etc.
-                return string.IsNullOrEmpty(testFilename)
-                       || testFilename[0] == '-'
-                       || Regex.IsMatch(testFilename, @"^\[([^]]*)\]");
+            return true;
+        }
+
+        private static bool IsEligibleForMultiVersion(ReadOnlySpan<char> folderName, string testFilePath, NamingOptions namingOptions)
+        {
+            var testFilename = Path.GetFileNameWithoutExtension(testFilePath.AsSpan());
+            if (!testFilename.StartsWith(folderName, StringComparison.OrdinalIgnoreCase))
+            {
+                return false;
             }
 
-            return false;
+            // Remove the folder name before cleaning as we don't care about cleaning that part
+            if (folderName.Length <= testFilename.Length)
+            {
+                testFilename = testFilename[folderName.Length..].Trim();
+            }
+
+            // There are no span overloads for regex unfortunately
+            var tmpTestFilename = testFilename.ToString();
+            if (CleanStringParser.TryClean(tmpTestFilename, namingOptions.CleanStringRegexes, out var cleanName))
+            {
+                tmpTestFilename = cleanName.Trim().ToString();
+            }
+
+            // The CleanStringParser should have removed common keywords etc.
+            return string.IsNullOrEmpty(tmpTestFilename)
+                   || testFilename[0] == '-'
+                   || Regex.IsMatch(tmpTestFilename, @"^\[([^]]*)\]", RegexOptions.Compiled);
+        }
+
+        private static ReadOnlySpan<char> TrimFilenameDelimiters(ReadOnlySpan<char> name, ReadOnlySpan<char> videoFlagDelimiters)
+        {
+            return name.IsEmpty ? name : name.TrimEnd().TrimEnd(videoFlagDelimiters).TrimEnd();
         }
 
-        private List<VideoFileInfo> GetExtras(IEnumerable<VideoFileInfo> remainingFiles, List<string> baseNames)
+        private static bool StartsWith(ReadOnlySpan<char> fileName, ReadOnlySpan<char> baseName, ReadOnlySpan<char> trimmedBaseName)
         {
-            foreach (var name in baseNames.ToList())
+            if (baseName.IsEmpty)
             {
-                var trimmedName = name.TrimEnd().TrimEnd(_options.VideoFlagDelimiters).TrimEnd();
-                baseNames.Add(trimmedName);
+                return false;
             }
 
-            return remainingFiles
-                .Where(i => i.ExtraType != null)
-                .Where(i => baseNames.Any(b =>
-                    i.FileNameWithoutExtension.StartsWith(b, StringComparison.OrdinalIgnoreCase)))
-                .ToList();
+            return fileName.StartsWith(baseName, StringComparison.OrdinalIgnoreCase)
+                   || (!trimmedBaseName.IsEmpty && fileName.StartsWith(trimmedBaseName, StringComparison.OrdinalIgnoreCase));
+        }
+
+        /// <summary>
+        /// Finds similar filenames to that of [baseName] and removes any matches from [remainingFiles].
+        /// </summary>
+        /// <param name="remainingFiles">The list of remaining filenames.</param>
+        /// <param name="baseName">The base name to use for the comparison.</param>
+        /// <param name="videoFlagDelimiters">The video flag delimiters.</param>
+        /// <returns>A list of video extras for [baseName].</returns>
+        private static List<VideoFileInfo> ExtractExtras(IList<VideoFileInfo> remainingFiles, ReadOnlySpan<char> baseName, ReadOnlySpan<char> videoFlagDelimiters)
+        {
+            return ExtractExtras(remainingFiles, baseName, ReadOnlySpan<char>.Empty, videoFlagDelimiters);
+        }
+
+        /// <summary>
+        /// Finds similar filenames to that of [firstBaseName] and [secondBaseName] and removes any matches from [remainingFiles].
+        /// </summary>
+        /// <param name="remainingFiles">The list of remaining filenames.</param>
+        /// <param name="firstBaseName">The first base name to use for the comparison.</param>
+        /// <param name="secondBaseName">The second base name to use for the comparison.</param>
+        /// <param name="videoFlagDelimiters">The video flag delimiters.</param>
+        /// <returns>A list of video extras for [firstBaseName] and [secondBaseName].</returns>
+        private static List<VideoFileInfo> ExtractExtras(IList<VideoFileInfo> remainingFiles, ReadOnlySpan<char> firstBaseName, ReadOnlySpan<char> secondBaseName, ReadOnlySpan<char> videoFlagDelimiters)
+        {
+            var trimmedFirstBaseName = TrimFilenameDelimiters(firstBaseName, videoFlagDelimiters);
+            var trimmedSecondBaseName = TrimFilenameDelimiters(secondBaseName, videoFlagDelimiters);
+
+            var result = new List<VideoFileInfo>();
+            for (var pos = remainingFiles.Count - 1; pos >= 0; pos--)
+            {
+                var file = remainingFiles[pos];
+                if (file.ExtraType == null)
+                {
+                    continue;
+                }
+
+                var filename = file.FileNameWithoutExtension;
+                if (StartsWith(filename, firstBaseName, trimmedFirstBaseName)
+                    || StartsWith(filename, secondBaseName, trimmedSecondBaseName))
+                {
+                    result.Add(file);
+                    remainingFiles.RemoveAt(pos);
+                }
+            }
+
+            return result;
         }
     }
 }

Emby.Naming/Video/VideoResolver.cs

@@ -9,38 +9,28 @@ namespace Emby.Naming.Video
     /// <summary>
     /// Resolves <see cref="VideoFileInfo"/> from file path.
     /// </summary>
-    public class VideoResolver
+    public static class VideoResolver
     {
-        private readonly NamingOptions _options;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="VideoResolver"/> class.
-        /// </summary>
-        /// <param name="options"><see cref="NamingOptions"/> object containing VideoFileExtensions, StubFileExtensions, CleanStringRegexes and CleanDateTimeRegexes
-        /// and passes options in <see cref="StubResolver"/>, <see cref="FlagParser"/>, <see cref="Format3DParser"/> and <see cref="ExtraResolver"/>.</param>
-        public VideoResolver(NamingOptions options)
-        {
-            _options = options;
-        }
-
         /// <summary>
         /// Resolves the directory.
         /// </summary>
         /// <param name="path">The path.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>VideoFileInfo.</returns>
-        public VideoFileInfo? ResolveDirectory(string? path)
+        public static VideoFileInfo? ResolveDirectory(string? path, NamingOptions namingOptions)
         {
-            return Resolve(path, true);
+            return Resolve(path, true, namingOptions);
         }
 
         /// <summary>
         /// Resolves the file.
         /// </summary>
         /// <param name="path">The path.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>VideoFileInfo.</returns>
-        public VideoFileInfo? ResolveFile(string? path)
+        public static VideoFileInfo? ResolveFile(string? path, NamingOptions namingOptions)
         {
-            return Resolve(path, false);
+            return Resolve(path, false, namingOptions);
         }
 
         /// <summary>
@@ -48,10 +38,11 @@ namespace Emby.Naming.Video
         /// </summary>
         /// <param name="path">The path.</param>
         /// <param name="isDirectory">if set to <c>true</c> [is folder].</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <param name="parseName">Whether or not the name should be parsed for info.</param>
         /// <returns>VideoFileInfo.</returns>
         /// <exception cref="ArgumentNullException"><c>path</c> is <c>null</c>.</exception>
-        public VideoFileInfo? Resolve(string? path, bool isDirectory, bool parseName = true)
+        public static VideoFileInfo? Resolve(string? path, bool isDirectory, NamingOptions namingOptions, bool parseName = true)
         {
             if (string.IsNullOrEmpty(path))
             {
@@ -67,10 +58,10 @@ namespace Emby.Naming.Video
                 var extension = Path.GetExtension(path.AsSpan());
 
                 // Check supported extensions
-                if (!_options.VideoFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase))
+                if (!namingOptions.VideoFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase))
                 {
                     // It's not supported. Check stub extensions
-                    if (!StubResolver.TryResolveFile(path, _options, out stubType))
+                    if (!StubResolver.TryResolveFile(path, namingOptions, out stubType))
                     {
                         return null;
                     }
@@ -81,10 +72,9 @@ namespace Emby.Naming.Video
                 container = extension.TrimStart('.');
             }
 
-            var flags = new FlagParser(_options).GetFlags(path);
-            var format3DResult = new Format3DParser(_options).Parse(flags);
+            var format3DResult = Format3DParser.Parse(path, namingOptions);
 
-            var extraResult = new ExtraResolver(_options).GetExtraInfo(path);
+            var extraResult = new ExtraResolver(namingOptions).GetExtraInfo(path);
 
             var name = Path.GetFileNameWithoutExtension(path);
 
@@ -92,12 +82,12 @@ namespace Emby.Naming.Video
 
             if (parseName)
             {
-                var cleanDateTimeResult = CleanDateTime(name);
+                var cleanDateTimeResult = CleanDateTime(name, namingOptions);
                 name = cleanDateTimeResult.Name;
                 year = cleanDateTimeResult.Year;
 
                 if (extraResult.ExtraType == null
-                    && TryCleanString(name, out ReadOnlySpan<char> newName))
+                    && TryCleanString(name, namingOptions, out ReadOnlySpan<char> newName))
                 {
                     name = newName.ToString();
                 }
@@ -121,43 +111,47 @@ namespace Emby.Naming.Video
         /// Determines if path is video file based on extension.
         /// </summary>
         /// <param name="path">Path to file.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>True if is video file.</returns>
-        public bool IsVideoFile(string path)
+        public static bool IsVideoFile(string path, NamingOptions namingOptions)
         {
             var extension = Path.GetExtension(path.AsSpan());
-            return _options.VideoFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase);
+            return namingOptions.VideoFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase);
         }
 
         /// <summary>
         /// Determines if path is video file stub based on extension.
         /// </summary>
         /// <param name="path">Path to file.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>True if is video file stub.</returns>
-        public bool IsStubFile(string path)
+        public static bool IsStubFile(string path, NamingOptions namingOptions)
         {
             var extension = Path.GetExtension(path.AsSpan());
-            return _options.StubFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase);
+            return namingOptions.StubFileExtensions.Contains(extension, StringComparison.OrdinalIgnoreCase);
         }
 
         /// <summary>
         /// Tries to clean name of clutter.
         /// </summary>
         /// <param name="name">Raw name.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <param name="newName">Clean name.</param>
         /// <returns>True if cleaning of name was successful.</returns>
-        public bool TryCleanString([NotNullWhen(true)] string? name, out ReadOnlySpan<char> newName)
+        public static bool TryCleanString([NotNullWhen(true)] string? name, NamingOptions namingOptions, out ReadOnlySpan<char> newName)
         {
-            return CleanStringParser.TryClean(name, _options.CleanStringRegexes, out newName);
+            return CleanStringParser.TryClean(name, namingOptions.CleanStringRegexes, out newName);
         }
 
         /// <summary>
         /// Tries to get name and year from raw name.
         /// </summary>
         /// <param name="name">Raw name.</param>
+        /// <param name="namingOptions">The naming options.</param>
         /// <returns>Returns <see cref="CleanDateTimeResult"/> with name and optional year.</returns>
-        public CleanDateTimeResult CleanDateTime(string name)
+        public static CleanDateTimeResult CleanDateTime(string name, NamingOptions namingOptions)
         {
-            return CleanDateTimeParser.Clean(name, _options.CleanDateTimeRegexes);
+            return CleanDateTimeParser.Clean(name, namingOptions.CleanDateTimeRegexes);
         }
     }
 }

Emby.Server.Implementations/AppBase/BaseConfigurationManager.cs

@@ -299,25 +299,29 @@ namespace Emby.Server.Implementations.AppBase
         /// <inheritdoc />
         public object GetConfiguration(string key)
         {
-            return _configurations.GetOrAdd(key, k =>
-            {
-                var file = GetConfigurationFile(key);
+            return _configurations.GetOrAdd(
+                key,
+                (k, configurationManager) =>
+                {
+                    var file = configurationManager.GetConfigurationFile(k);
 
-                var configurationInfo = _configurationStores
-                    .FirstOrDefault(i => string.Equals(i.Key, key, StringComparison.OrdinalIgnoreCase));
+                    var configurationInfo = Array.Find(
+                        configurationManager._configurationStores,
+                        i => string.Equals(i.Key, k, StringComparison.OrdinalIgnoreCase));
 
-                if (configurationInfo == null)
-                {
-                    throw new ResourceNotFoundException("Configuration with key " + key + " not found.");
-                }
+                    if (configurationInfo == null)
+                    {
+                        throw new ResourceNotFoundException("Configuration with key " + k + " not found.");
+                    }
 
-                var configurationType = configurationInfo.ConfigurationType;
+                    var configurationType = configurationInfo.ConfigurationType;
 
-                lock (_configurationSyncLock)
-                {
-                    return LoadConfiguration(file, configurationType);
-                }
-            });
+                    lock (configurationManager._configurationSyncLock)
+                    {
+                        return configurationManager.LoadConfiguration(file, configurationType);
+                    }
+                },
+                this);
         }
 
         private object LoadConfiguration(string path, Type configurationType)

Emby.Server.Implementations/Data/SqliteItemRepository.cs

@@ -43,6 +43,7 @@ namespace Emby.Server.Implementations.Data
     /// </summary>
     public class SqliteItemRepository : BaseSqliteRepository, IItemRepository
     {
+        private const string FromText = " from TypedBaseItems A";
         private const string ChaptersTableName = "Chapters2";
 
         private readonly IServerConfigurationManager _config;
@@ -1045,18 +1046,34 @@ namespace Emby.Server.Implementations.Data
                 return Array.Empty<ItemImageInfo>();
             }
 
-            var list = new List<ItemImageInfo>();
-            foreach (var part in value.SpanSplit('|'))
+            // TODO The following is an ugly performance optimization, but it's extremely unlikely that the data in the database would be malformed
+            var valueSpan = value.AsSpan();
+            var count = valueSpan.CountOccurrences('|') + 1;
+
+            var position = 0;
+            var result = new ItemImageInfo[count];
+            foreach (var part in valueSpan.Split('|'))
             {
                 var image = ItemImageInfoFromValueString(part);
 
                 if (image != null)
                 {
-                    list.Add(image);
+                    result[position++] = image;
                 }
             }
 
-            return list.ToArray();
+            if (position == count)
+            {
+                return result;
+            }
+
+            if (position == 0)
+            {
+                return Array.Empty<ItemImageInfo>();
+            }
+
+            // Extremely unlikely, but somehow one or more of the image strings were malformed. Cut the array.
+            return result[..position];
         }
 
         private void AppendItemImageInfo(StringBuilder bldr, ItemImageInfo image)
@@ -2250,10 +2267,8 @@ namespace Emby.Server.Implementations.Data
             return query.IncludeItemTypes.Any(x => _seriesTypes.Contains(x));
         }
 
-        private List<string> GetFinalColumnsToSelect(InternalItemsQuery query, IEnumerable<string> startColumns)
+        private void SetFinalColumnsToSelect(InternalItemsQuery query, List<string> columns)
         {
-            var list = startColumns.ToList();
-
             foreach (var field in _allFields)
             {
                 if (!HasField(query, field))
@@ -2261,28 +2276,28 @@ namespace Emby.Server.Implementations.Data
                     switch (field)
                     {
                         case ItemFields.Settings:
-                            list.Remove("IsLocked");
-                            list.Remove("PreferredMetadataCountryCode");
-                            list.Remove("PreferredMetadataLanguage");
-                            list.Remove("LockedFields");
+                            columns.Remove("IsLocked");
+                            columns.Remove("PreferredMetadataCountryCode");
+                            columns.Remove("PreferredMetadataLanguage");
+                            columns.Remove("LockedFields");
                             break;
                         case ItemFields.ServiceName:
-                            list.Remove("ExternalServiceId");
+                            columns.Remove("ExternalServiceId");
                             break;
                         case ItemFields.SortName:
-                            list.Remove("ForcedSortName");
+                            columns.Remove("ForcedSortName");
                             break;
                         case ItemFields.Taglines:
-                            list.Remove("Tagline");
+                            columns.Remove("Tagline");
                             break;
                         case ItemFields.Tags:
-                            list.Remove("Tags");
+                            columns.Remove("Tags");
                             break;
                         case ItemFields.IsHD:
                             // do nothing
                             break;
                         default:
-                            list.Remove(field.ToString());
+                            columns.Remove(field.ToString());
                             break;
                     }
                 }
@@ -2290,60 +2305,60 @@ namespace Emby.Server.Implementations.Data
 
             if (!HasProgramAttributes(query))
             {
-                list.Remove("IsMovie");
-                list.Remove("IsSeries");
-                list.Remove("EpisodeTitle");
-                list.Remove("IsRepeat");
-                list.Remove("ShowId");
+                columns.Remove("IsMovie");
+                columns.Remove("IsSeries");
+                columns.Remove("EpisodeTitle");
+                columns.Remove("IsRepeat");
+                columns.Remove("ShowId");
             }
 
             if (!HasEpisodeAttributes(query))
             {
-                list.Remove("SeasonName");
-                list.Remove("SeasonId");
+                columns.Remove("SeasonName");
+                columns.Remove("SeasonId");
             }
 
             if (!HasStartDate(query))
             {
-                list.Remove("StartDate");
+                columns.Remove("StartDate");
             }
 
             if (!HasTrailerTypes(query))
             {
-                list.Remove("TrailerTypes");
+                columns.Remove("TrailerTypes");
             }
 
             if (!HasArtistFields(query))
             {
-                list.Remove("AlbumArtists");
-                list.Remove("Artists");
+                columns.Remove("AlbumArtists");
+                columns.Remove("Artists");
             }
 
             if (!HasSeriesFields(query))
             {
-                list.Remove("SeriesId");
+                columns.Remove("SeriesId");
             }
 
             if (!HasEpisodeAttributes(query))
             {
-                list.Remove("SeasonName");
-                list.Remove("SeasonId");
+                columns.Remove("SeasonName");
+                columns.Remove("SeasonId");
             }
 
             if (!query.DtoOptions.EnableImages)
             {
-                list.Remove("Images");
+                columns.Remove("Images");
             }
 
             if (EnableJoinUserData(query))
             {
-                list.Add("UserDatas.UserId");
-                list.Add("UserDatas.lastPlayedDate");
-                list.Add("UserDatas.playbackPositionTicks");
-                list.Add("UserDatas.playcount");
-                list.Add("UserDatas.isFavorite");
-                list.Add("UserDatas.played");
-                list.Add("UserDatas.rating");
+                columns.Add("UserDatas.UserId");
+                columns.Add("UserDatas.lastPlayedDate");
+                columns.Add("UserDatas.playbackPositionTicks");
+                columns.Add("UserDatas.playcount");
+                columns.Add("UserDatas.isFavorite");
+                columns.Add("UserDatas.played");
+                columns.Add("UserDatas.rating");
             }
 
             if (query.SimilarTo != null)
@@ -2391,7 +2406,7 @@ namespace Emby.Server.Implementations.Data
 
                 builder.Append(") as SimilarityScore");
 
-                list.Add(builder.ToString());
+                columns.Add(builder.ToString());
 
                 var oldLen = query.ExcludeItemIds.Length;
                 var newLen = oldLen + item.ExtraIds.Length + 1;
@@ -2418,10 +2433,8 @@ namespace Emby.Server.Implementations.Data
 
                 builder.Append(") as SearchScore");
 
-                list.Add(builder.ToString());
+                columns.Add(builder.ToString());
             }
-
-            return list;
         }
 
         private void BindSearchParams(InternalItemsQuery query, IStatement statement)
@@ -2487,31 +2500,25 @@ namespace Emby.Server.Implementations.Data
 
         private string GetGroupBy(InternalItemsQuery query)
         {
-            var groups = new List<string>();
-
-            if (EnableGroupByPresentationUniqueKey(query))
+            var enableGroupByPresentationUniqueKey = EnableGroupByPresentationUniqueKey(query);
+            if (enableGroupByPresentationUniqueKey && query.GroupBySeriesPresentationUniqueKey)
             {
-                groups.Add("PresentationUniqueKey");
+                return " Group by PresentationUniqueKey, SeriesPresentationUniqueKey";
             }
 
-            if (query.GroupBySeriesPresentationUniqueKey)
+            if (enableGroupByPresentationUniqueKey)
             {
-                groups.Add("SeriesPresentationUniqueKey");
+                return " Group by PresentationUniqueKey";
             }
 
-            if (groups.Count > 0)
+            if (query.GroupBySeriesPresentationUniqueKey)
             {
-                return " Group by " + string.Join(',', groups);
+                return " Group by SeriesPresentationUniqueKey";
             }
 
             return string.Empty;
         }
 
-        private string GetFromText(string alias = "A")
-        {
-            return " from TypedBaseItems " + alias;
-        }
-
         public int GetCount(InternalItemsQuery query)
         {
             if (query == null)
@@ -2529,17 +2536,21 @@ namespace Emby.Server.Implementations.Data
                 query.Limit = query.Limit.Value + 4;
             }
 
-            var commandText = "select "
-                              + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count(distinct PresentationUniqueKey)" }))
-                              + GetFromText()
-                              + GetJoinUserDataText(query);
+            var columns = new List<string> { "count(distinct PresentationUniqueKey)" };
+            SetFinalColumnsToSelect(query, columns);
+            var commandTextBuilder = new StringBuilder("select ", 256)
+                .AppendJoin(',', columns)
+                .Append(FromText)
+                .Append(GetJoinUserDataText(query));
 
             var whereClauses = GetWhereClauses(query, null);
             if (whereClauses.Count != 0)
             {
-                commandText += " where " + string.Join(" AND ", whereClauses);
+                commandTextBuilder.Append(" where ")
+                    .AppendJoin(" AND ", whereClauses);
             }
 
+            var commandText = commandTextBuilder.ToString();
             int count;
             using (var connection = GetConnection(true))
             {
@@ -2581,20 +2592,23 @@ namespace Emby.Server.Implementations.Data
                 query.Limit = query.Limit.Value + 4;
             }
 
-            var commandText = "select "
-                            + string.Join(',', GetFinalColumnsToSelect(query, _retriveItemColumns))
-                            + GetFromText()
-                            + GetJoinUserDataText(query);
+            var columns = _retriveItemColumns.ToList();
+            SetFinalColumnsToSelect(query, columns);
+            var commandTextBuilder = new StringBuilder("select ", 1024)
+                .AppendJoin(',', columns)
+                .Append(FromText)
+                .Append(GetJoinUserDataText(query));
 
             var whereClauses = GetWhereClauses(query, null);
 
             if (whereClauses.Count != 0)
             {
-                commandText += " where " + string.Join(" AND ", whereClauses);
+                commandTextBuilder.Append(" where ")
+                    .AppendJoin(" AND ", whereClauses);
             }
 
-            commandText += GetGroupBy(query)
-                        + GetOrderByText(query);
+            commandTextBuilder.Append(GetGroupBy(query))
+                .Append(GetOrderByText(query));
 
             if (query.Limit.HasValue || query.StartIndex.HasValue)
             {
@@ -2602,15 +2616,18 @@ namespace Emby.Server.Implementations.Data
 
                 if (query.Limit.HasValue || offset > 0)
                 {
-                    commandText += " LIMIT " + (query.Limit ?? int.MaxValue).ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" LIMIT ")
+                        .Append(query.Limit ?? int.MaxValue);
                 }
 
                 if (offset > 0)
                 {
-                    commandText += " OFFSET " + offset.ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" OFFSET ")
+                        .Append(offset);
                 }
             }
 
+            var commandText = commandTextBuilder.ToString();
             var items = new List<BaseItem>();
             using (var connection = GetConnection(true))
             {
@@ -2766,20 +2783,27 @@ namespace Emby.Server.Implementations.Data
                 query.Limit = query.Limit.Value + 4;
             }
 
-            var commandText = "select "
-                            + string.Join(',', GetFinalColumnsToSelect(query, _retriveItemColumns))
-                            + GetFromText()
-                            + GetJoinUserDataText(query);
+            var columns = _retriveItemColumns.ToList();
+            SetFinalColumnsToSelect(query, columns);
+            var commandTextBuilder = new StringBuilder("select ", 512)
+                .AppendJoin(',', columns)
+                .Append(FromText)
+                .Append(GetJoinUserDataText(query));
 
             var whereClauses = GetWhereClauses(query, null);
 
             var whereText = whereClauses.Count == 0 ?
                 string.Empty :
-                " where " + string.Join(" AND ", whereClauses);
+                string.Join(" AND ", whereClauses);
 
-            commandText += whereText
-                        + GetGroupBy(query)
-                        + GetOrderByText(query);
+            if (!string.IsNullOrEmpty(whereText))
+            {
+                commandTextBuilder.Append(" where ")
+                    .Append(whereText);
+            }
+
+            commandTextBuilder.Append(GetGroupBy(query))
+                .Append(GetOrderByText(query));
 
             if (query.Limit.HasValue || query.StartIndex.HasValue)
             {
@@ -2787,43 +2811,58 @@ namespace Emby.Server.Implementations.Data
 
                 if (query.Limit.HasValue || offset > 0)
                 {
-                    commandText += " LIMIT " + (query.Limit ?? int.MaxValue).ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" LIMIT ")
+                        .Append(query.Limit ?? int.MaxValue);
                 }
 
                 if (offset > 0)
                 {
-                    commandText += " OFFSET " + offset.ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" OFFSET ")
+                        .Append(offset);
                 }
             }
 
             var isReturningZeroItems = query.Limit.HasValue && query.Limit <= 0;
 
-            var statementTexts = new List<string>();
+            var itemQuery = string.Empty;
+            var totalRecordCountQuery = string.Empty;
             if (!isReturningZeroItems)
             {
-                statementTexts.Add(commandText);
+                itemQuery = commandTextBuilder.ToString();
             }
 
             if (query.EnableTotalRecordCount)
             {
-                commandText = string.Empty;
+                commandTextBuilder.Clear();
+
+                commandTextBuilder.Append(" select ");
 
+                List<string> columnsToSelect;
                 if (EnableGroupByPresentationUniqueKey(query))
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (distinct PresentationUniqueKey)" };
                 }
                 else if (query.GroupBySeriesPresentationUniqueKey)
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (distinct SeriesPresentationUniqueKey)" };
                 }
                 else
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (guid)" };
                 }
 
-                commandText += GetJoinUserDataText(query)
-                            + whereText;
-                statementTexts.Add(commandText);
+                SetFinalColumnsToSelect(query, columnsToSelect);
+
+                commandTextBuilder.AppendJoin(',', columnsToSelect)
+                    .Append(FromText)
+                    .Append(GetJoinUserDataText(query));
+                if (!string.IsNullOrEmpty(whereText))
+                {
+                    commandTextBuilder.Append(" where ")
+                        .Append(whereText);
+                }
+
+                totalRecordCountQuery = commandTextBuilder.ToString();
             }
 
             var list = new List<BaseItem>();
@@ -2833,11 +2872,12 @@ namespace Emby.Server.Implementations.Data
                 connection.RunInTransaction(
                 db =>
                 {
-                    var statements = PrepareAll(db, statementTexts);
+                    var itemQueryStatement = PrepareStatement(db, itemQuery);
+                    var totalRecordCountQueryStatement = PrepareStatement(db, totalRecordCountQuery);
 
                     if (!isReturningZeroItems)
                     {
-                        using (var statement = statements[0])
+                        using (var statement = itemQueryStatement)
                         {
                             if (EnableJoinUserData(query))
                             {
@@ -2867,11 +2907,14 @@ namespace Emby.Server.Implementations.Data
                                 }
                             }
                         }
+
+                        LogQueryTime("GetItems.ItemQuery", itemQuery, now);
                     }
 
+                    now = DateTime.UtcNow;
                     if (query.EnableTotalRecordCount)
                     {
-                        using (var statement = statements[statements.Length - 1])
+                        using (var statement = totalRecordCountQueryStatement)
                         {
                             if (EnableJoinUserData(query))
                             {
@@ -2886,11 +2929,12 @@ namespace Emby.Server.Implementations.Data
 
                             result.TotalRecordCount = statement.ExecuteQuery().SelectScalarInt().First();
                         }
+
+                        LogQueryTime("GetItems.TotalRecordCount", totalRecordCountQuery, now);
                     }
                 }, ReadTransactionMode);
             }
 
-            LogQueryTime("GetItems", commandText, now);
             result.Items = list;
             return result;
         }
@@ -3023,19 +3067,22 @@ namespace Emby.Server.Implementations.Data
 
             var now = DateTime.UtcNow;
 
-            var commandText = "select "
-                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid" }))
-                            + GetFromText()
-                            + GetJoinUserDataText(query);
+            var columns = new List<string> { "guid" };
+            SetFinalColumnsToSelect(query, columns);
+            var commandTextBuilder = new StringBuilder("select ", 256)
+                .AppendJoin(',', columns)
+                .Append(FromText)
+                .Append(GetJoinUserDataText(query));
 
             var whereClauses = GetWhereClauses(query, null);
             if (whereClauses.Count != 0)
             {
-                commandText += " where " + string.Join(" AND ", whereClauses);
+                commandTextBuilder.Append(" where ")
+                    .AppendJoin(" AND ", whereClauses);
             }
 
-            commandText += GetGroupBy(query)
-                        + GetOrderByText(query);
+            commandTextBuilder.Append(GetGroupBy(query))
+                .Append(GetOrderByText(query));
 
             if (query.Limit.HasValue || query.StartIndex.HasValue)
             {
@@ -3043,15 +3090,18 @@ namespace Emby.Server.Implementations.Data
 
                 if (query.Limit.HasValue || offset > 0)
                 {
-                    commandText += " LIMIT " + (query.Limit ?? int.MaxValue).ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" LIMIT ")
+                        .Append(query.Limit ?? int.MaxValue);
                 }
 
                 if (offset > 0)
                 {
-                    commandText += " OFFSET " + offset.ToString(CultureInfo.InvariantCulture);
+                    commandTextBuilder.Append(" OFFSET ")
+                        .Append(offset);
                 }
             }
 
+            var commandText = commandTextBuilder.ToString();
             var list = new List<Guid>();
             using (var connection = GetConnection(true))
             {
@@ -3090,7 +3140,9 @@ namespace Emby.Server.Implementations.Data
 
             var now = DateTime.UtcNow;
 
-            var commandText = "select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid", "path" })) + GetFromText();
+            var columns = new List<string> { "guid", "path" };
+            SetFinalColumnsToSelect(query, columns);
+            var commandText = "select " + string.Join(',', columns) + FromText;
 
             var whereClauses = GetWhereClauses(query, null);
             if (whereClauses.Count != 0)
@@ -3166,9 +3218,11 @@ namespace Emby.Server.Implementations.Data
 
             var now = DateTime.UtcNow;
 
+            var columns = new List<string> { "guid" };
+            SetFinalColumnsToSelect(query, columns);
             var commandText = "select "
-                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "guid" }))
-                            + GetFromText()
+                            + string.Join(',', columns)
+                            + FromText
                             + GetJoinUserDataText(query);
 
             var whereClauses = GetWhereClauses(query, null);
@@ -3208,19 +3262,23 @@ namespace Emby.Server.Implementations.Data
             {
                 commandText = string.Empty;
 
+                List<string> columnsToSelect;
                 if (EnableGroupByPresentationUniqueKey(query))
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (distinct PresentationUniqueKey)" };
                 }
                 else if (query.GroupBySeriesPresentationUniqueKey)
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct SeriesPresentationUniqueKey)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (distinct SeriesPresentationUniqueKey)" };
                 }
                 else
                 {
-                    commandText += " select " + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (guid)" })) + GetFromText();
+                    columnsToSelect = new List<string> { "count (guid)" };
                 }
 
+                SetFinalColumnsToSelect(query, columnsToSelect);
+                commandText += " select " + string.Join(',', columnsToSelect) + FromText;
+
                 commandText += GetJoinUserDataText(query)
                             + whereText;
                 statementTexts.Add(commandText);
@@ -4415,56 +4473,50 @@ namespace Emby.Server.Implementations.Data
                 whereClauses.Add(GetProviderIdClause(query.HasTvdbId.Value, "tvdb"));
             }
 
-            var includedItemByNameTypes = GetItemByNameTypesInQuery(query);
-            var enableItemsByName = (query.IncludeItemsByName ?? false) && includedItemByNameTypes.Count > 0;
-
             var queryTopParentIds = query.TopParentIds;
 
-            if (queryTopParentIds.Length == 1)
+            if (queryTopParentIds.Length > 0)
             {
-                if (enableItemsByName && includedItemByNameTypes.Count == 1)
+                var includedItemByNameTypes = GetItemByNameTypesInQuery(query);
+                var enableItemsByName = (query.IncludeItemsByName ?? false) && includedItemByNameTypes.Count > 0;
+
+                if (queryTopParentIds.Length == 1)
                 {
-                    whereClauses.Add("(TopParentId=@TopParentId or Type=@IncludedItemByNameType)");
-                    if (statement != null)
+                    if (enableItemsByName && includedItemByNameTypes.Count == 1)
                     {
-                        statement.TryBind("@IncludedItemByNameType", includedItemByNameTypes[0]);
+                        whereClauses.Add("(TopParentId=@TopParentId or Type=@IncludedItemByNameType)");
+                        statement?.TryBind("@IncludedItemByNameType", includedItemByNameTypes[0]);
+                    }
+                    else if (enableItemsByName && includedItemByNameTypes.Count > 1)
+                    {
+                        var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
+                        whereClauses.Add("(TopParentId=@TopParentId or Type in (" + itemByNameTypeVal + "))");
+                    }
+                    else
+                    {
+                        whereClauses.Add("(TopParentId=@TopParentId)");
                     }
-                }
-                else if (enableItemsByName && includedItemByNameTypes.Count > 1)
-                {
-                    var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
-                    whereClauses.Add("(TopParentId=@TopParentId or Type in (" + itemByNameTypeVal + "))");
-                }
-                else
-                {
-                    whereClauses.Add("(TopParentId=@TopParentId)");
-                }
 
-                if (statement != null)
-                {
-                    statement.TryBind("@TopParentId", queryTopParentIds[0].ToString("N", CultureInfo.InvariantCulture));
+                    statement?.TryBind("@TopParentId", queryTopParentIds[0].ToString("N", CultureInfo.InvariantCulture));
                 }
-            }
-            else if (queryTopParentIds.Length > 1)
-            {
-                var val = string.Join(',', queryTopParentIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
-
-                if (enableItemsByName && includedItemByNameTypes.Count == 1)
+                else if (queryTopParentIds.Length > 1)
                 {
-                    whereClauses.Add("(Type=@IncludedItemByNameType or TopParentId in (" + val + "))");
-                    if (statement != null)
+                    var val = string.Join(',', queryTopParentIds.Select(i => "'" + i.ToString("N", CultureInfo.InvariantCulture) + "'"));
+
+                    if (enableItemsByName && includedItemByNameTypes.Count == 1)
                     {
-                        statement.TryBind("@IncludedItemByNameType", includedItemByNameTypes[0]);
+                        whereClauses.Add("(Type=@IncludedItemByNameType or TopParentId in (" + val + "))");
+                        statement?.TryBind("@IncludedItemByNameType", includedItemByNameTypes[0]);
+                    }
+                    else if (enableItemsByName && includedItemByNameTypes.Count > 1)
+                    {
+                        var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
+                        whereClauses.Add("(Type in (" + itemByNameTypeVal + ") or TopParentId in (" + val + "))");
+                    }
+                    else
+                    {
+                        whereClauses.Add("TopParentId in (" + val + ")");
                     }
-                }
-                else if (enableItemsByName && includedItemByNameTypes.Count > 1)
-                {
-                    var itemByNameTypeVal = string.Join(',', includedItemByNameTypes.Select(i => "'" + i + "'"));
-                    whereClauses.Add("(Type in (" + itemByNameTypeVal + ") or TopParentId in (" + val + "))");
-                }
-                else
-                {
-                    whereClauses.Add("TopParentId in (" + val + ")");
                 }
             }
 
@@ -4746,17 +4798,12 @@ namespace Emby.Server.Implementations.Data
                 return true;
             }
 
-            var types = new[]
-            {
-                nameof(Episode),
-                nameof(Video),
-                nameof(Movie),
-                nameof(MusicVideo),
-                nameof(Series),
-                nameof(Season)
-            };
-
-            if (types.Any(i => query.IncludeItemTypes.Contains(i, StringComparer.OrdinalIgnoreCase)))
+            if (query.IncludeItemTypes.Contains(nameof(Episode), StringComparer.OrdinalIgnoreCase)
+                || query.IncludeItemTypes.Contains(nameof(Video), StringComparer.OrdinalIgnoreCase)
+                || query.IncludeItemTypes.Contains(nameof(Movie), StringComparer.OrdinalIgnoreCase)
+                || query.IncludeItemTypes.Contains(nameof(MusicVideo), StringComparer.OrdinalIgnoreCase)
+                || query.IncludeItemTypes.Contains(nameof(Series), StringComparer.OrdinalIgnoreCase)
+                || query.IncludeItemTypes.Contains(nameof(Season), StringComparer.OrdinalIgnoreCase))
             {
                 return true;
             }
@@ -5200,37 +5247,45 @@ AND Type = @InternalPersonType)");
 
             var now = DateTime.UtcNow;
 
-            var typeClause = itemValueTypes.Length == 1 ?
-                ("Type=" + itemValueTypes[0].ToString(CultureInfo.InvariantCulture)) :
-                ("Type in (" + string.Join(',', itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
-
-            var commandText = "Select Value From ItemValues where " + typeClause;
+            var stringBuilder = new StringBuilder("Select Value From ItemValues where Type", 128);
+            if (itemValueTypes.Length == 1)
+            {
+                stringBuilder.Append('=')
+                    .Append(itemValueTypes[0]);
+            }
+            else
+            {
+                stringBuilder.Append(" in (")
+                    .AppendJoin(',', itemValueTypes)
+                    .Append(')');
+            }
 
             if (withItemTypes.Count > 0)
             {
-                var typeString = string.Join(',', withItemTypes.Select(i => "'" + i + "'"));
-                commandText += " AND ItemId In (select guid from typedbaseitems where type in (" + typeString + "))";
+                stringBuilder.Append(" AND ItemId In (select guid from typedbaseitems where type in (")
+                    .AppendJoinInSingleQuotes(',', withItemTypes)
+                    .Append("))");
             }
 
             if (excludeItemTypes.Count > 0)
             {
-                var typeString = string.Join(',', excludeItemTypes.Select(i => "'" + i + "'"));
-                commandText += " AND ItemId not In (select guid from typedbaseitems where type in (" + typeString + "))";
+                stringBuilder.Append(" AND ItemId not In (select guid from typedbaseitems where type in (")
+                    .AppendJoinInSingleQuotes(',', excludeItemTypes)
+                    .Append("))");
             }
 
-            commandText += " Group By CleanValue";
+            stringBuilder.Append(" Group By CleanValue");
+            var commandText = stringBuilder.ToString();
 
             var list = new List<string>();
             using (var connection = GetConnection(true))
+            using (var statement = PrepareStatement(connection, commandText))
             {
-                using (var statement = PrepareStatement(connection, commandText))
+                foreach (var row in statement.ExecuteQuery())
                 {
-                    foreach (var row in statement.ExecuteQuery())
+                    if (row.TryGetString(0, out var result))
                     {
-                        if (row.TryGetString(0, out var result))
-                        {
-                            list.Add(result);
-                        }
+                        list.Add(result);
                     }
                 }
             }
@@ -5256,18 +5311,19 @@ AND Type = @InternalPersonType)");
             var now = DateTime.UtcNow;
 
             var typeClause = itemValueTypes.Length == 1 ?
-                ("Type=" + itemValueTypes[0].ToString(CultureInfo.InvariantCulture)) :
-                ("Type in (" + string.Join(',', itemValueTypes.Select(i => i.ToString(CultureInfo.InvariantCulture))) + ")");
+                ("Type=" + itemValueTypes[0]) :
+                ("Type in (" + string.Join(',', itemValueTypes) + ")");
 
             InternalItemsQuery typeSubQuery = null;
 
-            Dictionary<string, string> itemCountColumns = null;
+            string itemCountColumns = null;
 
+            var stringBuilder = new StringBuilder(1024);
             var typesToCount = query.IncludeItemTypes;
 
             if (typesToCount.Length > 0)
             {
-                var itemCountColumnQuery = "select group_concat(type, '|')" + GetFromText("B");
+                stringBuilder.Append("(select group_concat(type, '|') from TypedBaseItems B");
 
                 typeSubQuery = new InternalItemsQuery(query.User)
                 {
@@ -5283,20 +5339,22 @@ AND Type = @InternalPersonType)");
                 };
                 var whereClauses = GetWhereClauses(typeSubQuery, null);
 
-                whereClauses.Add("guid in (select ItemId from ItemValues where ItemValues.CleanValue=A.CleanName AND " + typeClause + ")");
+                stringBuilder.Append(" where ")
+                    .AppendJoin(" AND ", whereClauses)
+                    .Append(" AND ")
+                    .Append("guid in (select ItemId from ItemValues where ItemValues.CleanValue=A.CleanName AND ")
+                    .Append(typeClause)
+                    .Append(")) as itemTypes");
 
-                itemCountColumnQuery += " where " + string.Join(" AND ", whereClauses);
-
-                itemCountColumns = new Dictionary<string, string>()
-                {
-                    { "itemTypes", "(" + itemCountColumnQuery + ") as itemTypes" }
-                };
+                itemCountColumns = stringBuilder.ToString();
+                stringBuilder.Clear();
             }
 
             List<string> columns = _retriveItemColumns.ToList();
-            if (itemCountColumns != null)
+            // Unfortunately we need to add it to columns to ensure the order of the columns in the select
+            if (!string.IsNullOrEmpty(itemCountColumns))
             {
-                columns.AddRange(itemCountColumns.Values);
+                columns.Add(itemCountColumns);
             }
 
             // do this first before calling GetFinalColumnsToSelect, otherwise ExcludeItemIds will be set by SimilarTo
@@ -5317,20 +5375,20 @@ AND Type = @InternalPersonType)");
                 IsSeries = query.IsSeries
             };
 
-            columns = GetFinalColumnsToSelect(query, columns);
-
-            var commandText = "select "
-                            + string.Join(',', columns)
-                            + GetFromText()
-                            + GetJoinUserDataText(query);
+            SetFinalColumnsToSelect(query, columns);
 
             var innerWhereClauses = GetWhereClauses(innerQuery, null);
 
-            var innerWhereText = innerWhereClauses.Count == 0 ?
-                string.Empty :
-                " where " + string.Join(" AND ", innerWhereClauses);
+            stringBuilder.Append(" where Type=@SelectType And CleanName In (Select CleanValue from ItemValues where ")
+                .Append(typeClause)
+                .Append(" AND ItemId in (select guid from TypedBaseItems");
+            if (innerWhereClauses.Count > 0)
+            {
+                stringBuilder.Append(" where ")
+                    .AppendJoin(" AND ", innerWhereClauses);
+            }
 
-            var whereText = " where Type=@SelectType And CleanName In (Select CleanValue from ItemValues where " + typeClause + " AND ItemId in (select guid from TypedBaseItems" + innerWhereText + "))";
+            stringBuilder.Append("))");
 
             var outerQuery = new InternalItemsQuery(query.User)
             {
@@ -5355,23 +5413,31 @@ AND Type = @InternalPersonType)");
             };
 
             var outerWhereClauses = GetWhereClauses(outerQuery, null);
-
             if (outerWhereClauses.Count != 0)
             {
-                whereText += " AND " + string.Join(" AND ", outerWhereClauses);
+                stringBuilder.Append(" AND ")
+                    .AppendJoin(" AND ", outerWhereClauses);
             }
 
-            commandText += whereText + " group by PresentationUniqueKey";
+            var whereText = stringBuilder.ToString();
+            stringBuilder.Clear();
+
+            stringBuilder.Append("select ")
+                .AppendJoin(',', columns)
+                .Append(FromText)
+                .Append(GetJoinUserDataText(query))
+                .Append(whereText)
+                .Append(" group by PresentationUniqueKey");
 
             if (query.OrderBy.Count != 0
                 || query.SimilarTo != null
                 || !string.IsNullOrEmpty(query.SearchTerm))
             {
-                commandText += GetOrderByText(query);
+                stringBuilder.Append(GetOrderByText(query));
             }
             else
             {
-                commandText += " order by SortName";
+                stringBuilder.Append(" order by SortName");
             }
 
             if (query.Limit.HasValue || query.StartIndex.HasValue)
@@ -5380,32 +5446,39 @@ AND Type = @InternalPersonType)");
 
                 if (query.Limit.HasValue || offset > 0)
                 {
-                    commandText += " LIMIT " + (query.Limit ?? int.MaxValue).ToString(CultureInfo.InvariantCulture);
+                    stringBuilder.Append(" LIMIT ")
+                        .Append(query.Limit ?? int.MaxValue);
                 }
 
                 if (offset > 0)
                 {
-                    commandText += " OFFSET " + offset.ToString(CultureInfo.InvariantCulture);
+                    stringBuilder.Append(" OFFSET ")
+                        .Append(offset);
                 }
             }
 
             var isReturningZeroItems = query.Limit.HasValue && query.Limit <= 0;
 
-            var statementTexts = new List<string>();
+            string commandText = string.Empty;
+
             if (!isReturningZeroItems)
             {
-                statementTexts.Add(commandText);
+                commandText = stringBuilder.ToString();
             }
 
+            string countText = string.Empty;
             if (query.EnableTotalRecordCount)
             {
-                var countText = "select "
-                            + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
-                            + GetFromText()
-                            + GetJoinUserDataText(query)
-                            + whereText;
+                stringBuilder.Clear();
+                var columnsToSelect = new List<string> { "count (distinct PresentationUniqueKey)" };
+                SetFinalColumnsToSelect(query, columnsToSelect);
+                stringBuilder.Append("select ")
+                    .AppendJoin(',', columnsToSelect)
+                    .Append(FromText)
+                    .Append(GetJoinUserDataText(query))
+                    .Append(whereText);
 
-                statementTexts.Add(countText);
+                countText = stringBuilder.ToString();
             }
 
             var list = new List<(BaseItem, ItemCounts)>();
@@ -5415,11 +5488,9 @@ AND Type = @InternalPersonType)");
                 connection.RunInTransaction(
                     db =>
                     {
-                        var statements = PrepareAll(db, statementTexts);
-
                         if (!isReturningZeroItems)
                         {
-                            using (var statement = statements[0])
+                            using (var statement = PrepareStatement(db, commandText))
                             {
                                 statement.TryBind("@SelectType", returnType);
                                 if (EnableJoinUserData(query))
@@ -5460,13 +5531,7 @@ AND Type = @InternalPersonType)");
 
                         if (query.EnableTotalRecordCount)
                         {
-                            commandText = "select "
-                                        + string.Join(',', GetFinalColumnsToSelect(query, new[] { "count (distinct PresentationUniqueKey)" }))
-                                        + GetFromText()
-                                        + GetJoinUserDataText(query)
-                                        + whereText;
-
-                            using (var statement = statements[statements.Length - 1])
+                            using (var statement = PrepareStatement(db, countText))
                             {
                                 statement.TryBind("@SelectType", returnType);
                                 if (EnableJoinUserData(query))

Emby.Server.Implementations/Data/TypeMapper.cs

@@ -28,19 +28,9 @@ namespace Emby.Server.Implementations.Data
                 throw new ArgumentNullException(nameof(typeName));
             }
 
-            return _typeMap.GetOrAdd(typeName, LookupType);
-        }
-
-        /// <summary>
-        /// Lookups the type.
-        /// </summary>
-        /// <param name="typeName">Name of the type.</param>
-        /// <returns>Type.</returns>
-        private Type? LookupType(string typeName)
-        {
-            return AppDomain.CurrentDomain.GetAssemblies()
-                .Select(a => a.GetType(typeName))
-                .FirstOrDefault(t => t != null);
+            return _typeMap.GetOrAdd(typeName, k => AppDomain.CurrentDomain.GetAssemblies()
+                .Select(a => a.GetType(k))
+                .FirstOrDefault(t => t != null));
         }
     }
 }

Emby.Server.Implementations/IO/ManagedFileSystem.cs

@@ -7,6 +7,7 @@ using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices;
 using MediaBrowser.Common.Configuration;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Model.IO;
 using MediaBrowser.Model.System;
 using Microsoft.Extensions.Logging;
@@ -243,8 +244,8 @@ namespace Emby.Server.Implementations.IO
                 {
                     result.Length = fileInfo.Length;
 
-                    // Issue #2354 get the size of files behind symbolic links
-                    if (fileInfo.Attributes.HasFlag(FileAttributes.ReparsePoint))
+                    // Issue #2354 get the size of files behind symbolic links. Also Enum.HasFlag is bad as it boxes!
+                    if ((fileInfo.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint)
                     {
                         try
                         {
@@ -618,13 +619,13 @@ namespace Emby.Server.Implementations.IO
             {
                 files = files.Where(i =>
                 {
-                    var ext = i.Extension;
-                    if (ext == null)
+                    var ext = i.Extension.AsSpan();
+                    if (ext.IsEmpty)
                     {
                         return false;
                     }
 
-                    return extensions.Contains(ext, StringComparer.OrdinalIgnoreCase);
+                    return extensions.Contains(ext, StringComparison.OrdinalIgnoreCase);
                 });
             }
 
@@ -636,8 +637,7 @@ namespace Emby.Server.Implementations.IO
             var directoryInfo = new DirectoryInfo(path);
             var enumerationOptions = GetEnumerationOptions(recursive);
 
-            return ToMetadata(directoryInfo.EnumerateDirectories("*", enumerationOptions))
-                .Concat(ToMetadata(directoryInfo.EnumerateFiles("*", enumerationOptions)));
+            return ToMetadata(directoryInfo.EnumerateFileSystemInfos("*", enumerationOptions));
         }
 
         private IEnumerable<FileSystemMetadata> ToMetadata(IEnumerable<FileSystemInfo> infos)
@@ -672,13 +672,13 @@ namespace Emby.Server.Implementations.IO
             {
                 files = files.Where(i =>
                 {
-                    var ext = Path.GetExtension(i);
-                    if (ext == null)
+                    var ext = Path.GetExtension(i.AsSpan());
+                    if (ext.IsEmpty)
                     {
                         return false;
                     }
 
-                    return extensions.Contains(ext, StringComparer.OrdinalIgnoreCase);
+                    return extensions.Contains(ext, StringComparison.OrdinalIgnoreCase);
                 });
             }
 

Emby.Server.Implementations/Library/CoreResolutionIgnoreRule.cs

@@ -77,7 +77,7 @@ namespace Emby.Server.Implementations.Library
                 if (parent != null)
                 {
                     // Don't resolve these into audio files
-                    if (string.Equals(Path.GetFileNameWithoutExtension(filename), BaseItem.ThemeSongFilename, StringComparison.Ordinal)
+                    if (Path.GetFileNameWithoutExtension(filename.AsSpan()).Equals(BaseItem.ThemeSongFilename, StringComparison.Ordinal)
                         && _libraryManager.IsAudioFile(filename))
                     {
                         return true;

Emby.Server.Implementations/Library/LibraryManager.cs

@@ -696,25 +696,32 @@ namespace Emby.Server.Implementations.Library
         }
 
         private IEnumerable<BaseItem> ResolveFileList(
-            IEnumerable<FileSystemMetadata> fileList,
+            IReadOnlyList<FileSystemMetadata> fileList,
             IDirectoryService directoryService,
             Folder parent,
             string collectionType,
             IItemResolver[] resolvers,
             LibraryOptions libraryOptions)
         {
-            return fileList.Select(f =>
+            // Given that fileList is a list we can save enumerator allocations by indexing
+            for (var i = 0; i < fileList.Count; i++)
             {
+                var file = fileList[i];
+                BaseItem result = null;
                 try
                 {
-                    return ResolvePath(f, directoryService, resolvers, parent, collectionType, libraryOptions);
+                    result = ResolvePath(file, directoryService, resolvers, parent, collectionType, libraryOptions);
                 }
                 catch (Exception ex)
                 {
-                    _logger.LogError(ex, "Error resolving path {path}", f.FullName);
-                    return null;
+                    _logger.LogError(ex, "Error resolving path {Path}", file.FullName);
                 }
-            }).Where(i => i != null);
+
+                if (result != null)
+                {
+                    yield return result;
+                }
+            }
         }
 
         /// <summary>
@@ -2076,7 +2083,7 @@ namespace Emby.Server.Implementations.Library
                 return new List<Folder>();
             }
 
-            return GetCollectionFoldersInternal(item, GetUserRootFolder().Children.OfType<Folder>().ToList());
+            return GetCollectionFoldersInternal(item, GetUserRootFolder().Children.OfType<Folder>());
         }
 
         public List<Folder> GetCollectionFolders(BaseItem item, List<Folder> allUserRootChildren)
@@ -2101,10 +2108,10 @@ namespace Emby.Server.Implementations.Library
             return GetCollectionFoldersInternal(item, allUserRootChildren);
         }
 
-        private static List<Folder> GetCollectionFoldersInternal(BaseItem item, List<Folder> allUserRootChildren)
+        private static List<Folder> GetCollectionFoldersInternal(BaseItem item, IEnumerable<Folder> allUserRootChildren)
         {
             return allUserRootChildren
-                .Where(i => string.Equals(i.Path, item.Path, StringComparison.OrdinalIgnoreCase) || i.PhysicalLocations.Contains(item.Path, StringComparer.OrdinalIgnoreCase))
+                .Where(i => string.Equals(i.Path, item.Path, StringComparison.OrdinalIgnoreCase) || i.PhysicalLocations.Contains(item.Path.AsSpan(), StringComparison.OrdinalIgnoreCase))
                 .ToList();
         }
 
@@ -2112,9 +2119,9 @@ namespace Emby.Server.Implementations.Library
         {
             if (!(item is CollectionFolder collectionFolder))
             {
+                // List.Find is more performant than FirstOrDefault due to enumerator allocation
                 collectionFolder = GetCollectionFolders(item)
-                   .OfType<CollectionFolder>()
-                   .FirstOrDefault();
+                    .Find(folder => folder is CollectionFolder) as CollectionFolder;
             }
 
             return collectionFolder == null ? new LibraryOptions() : collectionFolder.GetLibraryOptions();
@@ -2500,8 +2507,7 @@ namespace Emby.Server.Implementations.Library
         /// <inheritdoc />
         public bool IsVideoFile(string path)
         {
-            var resolver = new VideoResolver(GetNamingOptions());
-            return resolver.IsVideoFile(path);
+            return VideoResolver.IsVideoFile(path, GetNamingOptions());
         }
 
         /// <inheritdoc />
@@ -2679,6 +2685,7 @@ namespace Emby.Server.Implementations.Library
             return changed;
         }
 
+        /// <inheritdoc />
         public NamingOptions GetNamingOptions()
         {
             if (_namingOptions == null)
@@ -2692,13 +2699,12 @@ namespace Emby.Server.Implementations.Library
 
         public ItemLookupInfo ParseName(string name)
         {
-            var resolver = new VideoResolver(GetNamingOptions());
-
-            var result = resolver.CleanDateTime(name);
+            var namingOptions = GetNamingOptions();
+            var result = VideoResolver.CleanDateTime(name, namingOptions);
 
             return new ItemLookupInfo
             {
-                Name = resolver.TryCleanString(result.Name, out var newName) ? newName.ToString() : result.Name,
+                Name = VideoResolver.TryCleanString(result.Name, namingOptions, out var newName) ? newName.ToString() : result.Name,
                 Year = result.Year
             };
         }
@@ -2712,9 +2718,7 @@ namespace Emby.Server.Implementations.Library
                 .SelectMany(i => _fileSystem.GetFiles(i.FullName, _videoFileExtensions, false, false))
                 .ToList();
 
-            var videoListResolver = new VideoListResolver(namingOptions);
-
-            var videos = videoListResolver.Resolve(fileSystemChildren);
+            var videos = VideoListResolver.Resolve(fileSystemChildren, namingOptions);
 
             var currentVideo = videos.FirstOrDefault(i => string.Equals(owner.Path, i.Files[0].Path, StringComparison.OrdinalIgnoreCase));
 
@@ -2758,9 +2762,7 @@ namespace Emby.Server.Implementations.Library
                 .SelectMany(i => _fileSystem.GetFiles(i.FullName, _videoFileExtensions, false, false))
                 .ToList();
 
-            var videoListResolver = new VideoListResolver(namingOptions);
-
-            var videos = videoListResolver.Resolve(fileSystemChildren);
+            var videos = VideoListResolver.Resolve(fileSystemChildren, namingOptions);
 
             var currentVideo = videos.FirstOrDefault(i => string.Equals(owner.Path, i.Files[0].Path, StringComparison.OrdinalIgnoreCase));
 

Emby.Server.Implementations/Library/MediaSourceManager.cs

@@ -352,7 +352,7 @@ namespace Emby.Server.Implementations.Library
 
         private string[] NormalizeLanguage(string language)
         {
-            if (language == null)
+            if (string.IsNullOrEmpty(language))
             {
                 return Array.Empty<string>();
             }
@@ -381,8 +381,7 @@ namespace Emby.Server.Implementations.Library
                 }
             }
 
-            var preferredSubs = string.IsNullOrEmpty(user.SubtitleLanguagePreference)
-                ? Array.Empty<string>() : NormalizeLanguage(user.SubtitleLanguagePreference);
+            var preferredSubs = NormalizeLanguage(user.SubtitleLanguagePreference);
 
             var defaultAudioIndex = source.DefaultAudioStreamIndex;
             var audioLangage = defaultAudioIndex == null
@@ -411,9 +410,7 @@ namespace Emby.Server.Implementations.Library
                 }
             }
 
-            var preferredAudio = string.IsNullOrEmpty(user.AudioLanguagePreference)
-                ? Array.Empty<string>()
-                : NormalizeLanguage(user.AudioLanguagePreference);
+            var preferredAudio = NormalizeLanguage(user.AudioLanguagePreference);
 
             source.DefaultAudioStreamIndex = MediaStreamSelector.GetDefaultAudioStreamIndex(source.MediaStreams, preferredAudio, user.PlayDefaultAudioTrack);
         }

Emby.Server.Implementations/Library/Resolvers/BaseVideoResolver.cs

@@ -47,11 +47,9 @@ namespace Emby.Server.Implementations.Library.Resolvers
         protected virtual TVideoType ResolveVideo<TVideoType>(ItemResolveArgs args, bool parseName)
               where TVideoType : Video, new()
         {
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
+            var namingOptions = LibraryManager.GetNamingOptions();
 
             // If the path is a file check for a matching extensions
-            var parser = new VideoResolver(namingOptions);
-
             if (args.IsDirectory)
             {
                 TVideoType video = null;
@@ -66,7 +64,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
                     {
                         if (IsDvdDirectory(child.FullName, filename, args.DirectoryService))
                         {
-                            videoInfo = parser.ResolveDirectory(args.Path);
+                            videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                             if (videoInfo == null)
                             {
@@ -84,7 +82,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
                         if (IsBluRayDirectory(child.FullName, filename, args.DirectoryService))
                         {
-                            videoInfo = parser.ResolveDirectory(args.Path);
+                            videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                             if (videoInfo == null)
                             {
@@ -102,7 +100,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
                     }
                     else if (IsDvdFile(filename))
                     {
-                        videoInfo = parser.ResolveDirectory(args.Path);
+                        videoInfo = VideoResolver.ResolveDirectory(args.Path, namingOptions);
 
                         if (videoInfo == null)
                         {
@@ -132,7 +130,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
             }
             else
             {
-                var videoInfo = parser.Resolve(args.Path, false, false);
+                var videoInfo = VideoResolver.Resolve(args.Path, false, namingOptions, false);
 
                 if (videoInfo == null)
                 {
@@ -252,10 +250,7 @@ namespace Emby.Server.Implementations.Library.Resolvers
 
         protected void Set3DFormat(Video video)
         {
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
-
-            var resolver = new Format3DParser(namingOptions);
-            var result = resolver.Parse(video.Path);
+            var result = Format3DParser.Parse(video.Path, LibraryManager.GetNamingOptions());
 
             Set3DFormat(video, result.Is3D, result.Format3D);
         }

Emby.Server.Implementations/Library/Resolvers/Movies/MovieResolver.cs

@@ -6,6 +6,7 @@ using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
 using Emby.Naming.Video;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Drawing;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Movies;
@@ -257,10 +258,9 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
                 }
             }
 
-            var namingOptions = ((LibraryManager)LibraryManager).GetNamingOptions();
+            var namingOptions = LibraryManager.GetNamingOptions();
 
-            var resolver = new VideoListResolver(namingOptions);
-            var resolverResult = resolver.Resolve(files, suppportMultiEditions).ToList();
+            var resolverResult = VideoListResolver.Resolve(files, namingOptions, suppportMultiEditions).ToList();
 
             var result = new MultiItemResolverResult
             {
@@ -537,7 +537,7 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
             return returnVideo;
         }
 
-        private bool IsInvalid(Folder parent, string collectionType)
+        private bool IsInvalid(Folder parent, ReadOnlySpan<char> collectionType)
         {
             if (parent != null)
             {
@@ -547,12 +547,12 @@ namespace Emby.Server.Implementations.Library.Resolvers.Movies
                 }
             }
 
-            if (string.IsNullOrEmpty(collectionType))
+            if (collectionType.IsEmpty)
             {
                 return false;
             }
 
-            return !_validCollectionTypes.Contains(collectionType, StringComparer.OrdinalIgnoreCase);
+            return !_validCollectionTypes.Contains(collectionType, StringComparison.OrdinalIgnoreCase);
         }
     }
 }

Emby.Server.Implementations/Localization/LocalizationManager.cs

@@ -5,7 +5,6 @@ using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
-using System.Linq;
 using System.Reflection;
 using System.Text.Json;
 using System.Threading.Tasks;
@@ -169,12 +168,22 @@ namespace Emby.Server.Implementations.Localization
 
         /// <inheritdoc />
         public CultureDto FindLanguageInfo(string language)
-            => GetCultures()
-                .FirstOrDefault(i =>
-                    string.Equals(i.DisplayName, language, StringComparison.OrdinalIgnoreCase)
-                    || string.Equals(i.Name, language, StringComparison.OrdinalIgnoreCase)
-                    || i.ThreeLetterISOLanguageNames.Contains(language, StringComparer.OrdinalIgnoreCase)
-                    || string.Equals(i.TwoLetterISOLanguageName, language, StringComparison.OrdinalIgnoreCase));
+        {
+            // TODO language should ideally be a ReadOnlySpan but moq cannot mock ref structs
+            for (var i = 0; i < _cultures.Count; i++)
+            {
+                var culture = _cultures[i];
+                if (language.Equals(culture.DisplayName, StringComparison.OrdinalIgnoreCase)
+                    || language.Equals(culture.Name, StringComparison.OrdinalIgnoreCase)
+                    || culture.ThreeLetterISOLanguageNames.Contains(language, StringComparison.OrdinalIgnoreCase)
+                    || language.Equals(culture.TwoLetterISOLanguageName, StringComparison.OrdinalIgnoreCase))
+                {
+                    return culture;
+                }
+            }
+
+            return default;
+        }
 
         /// <inheritdoc />
         public IEnumerable<CountryInfo> GetCountries()
@@ -224,7 +233,7 @@ namespace Emby.Server.Implementations.Localization
                 throw new ArgumentNullException(nameof(rating));
             }
 
-            if (_unratedValues.Contains(rating, StringComparer.OrdinalIgnoreCase))
+            if (_unratedValues.Contains(rating.AsSpan(), StringComparison.OrdinalIgnoreCase))
             {
                 return null;
             }
@@ -252,11 +261,11 @@ namespace Emby.Server.Implementations.Localization
             var index = rating.IndexOf(':', StringComparison.Ordinal);
             if (index != -1)
             {
-                rating = rating.Substring(index).TrimStart(':').Trim();
+                var trimmedRating = rating.AsSpan(index).TrimStart(':').Trim();
 
-                if (!string.IsNullOrWhiteSpace(rating))
+                if (!trimmedRating.IsEmpty)
                 {
-                    return GetRatingLevel(rating);
+                    return GetRatingLevel(trimmedRating.ToString());
                 }
             }
 
@@ -318,7 +327,8 @@ namespace Emby.Server.Implementations.Localization
 
             return _dictionaries.GetOrAdd(
                 culture,
-                f => GetDictionary(Prefix, culture, DefaultCulture + ".json").GetAwaiter().GetResult());
+                (key, localizationManager) => localizationManager.GetDictionary(Prefix, key, DefaultCulture + ".json").GetAwaiter().GetResult(),
+                this);
         }
 
         private async Task<Dictionary<string, string>> GetDictionary(string prefix, string culture, string baseFilename)

Emby.Server.Implementations/Serialization/MyXmlSerializer.cs

@@ -21,7 +21,8 @@ namespace Emby.Server.Implementations.Serialization
         private static XmlSerializer GetSerializer(Type type)
             => _serializers.GetOrAdd(
                 type.FullName ?? throw new ArgumentException($"Invalid type {type}."),
-                _ => new XmlSerializer(type));
+                (_, t) => new XmlSerializer(t),
+                type);
 
         /// <summary>
         /// Serializes to writer.

Emby.Server.Implementations/ServerApplicationPaths.cs

@@ -25,6 +25,10 @@ namespace Emby.Server.Implementations
                 cacheDirectoryPath,
                 webDirectoryPath)
         {
+            // ProgramDataPath cannot change when the server is running, so cache these to avoid allocations.
+            RootFolderPath = Path.Join(ProgramDataPath, "root");
+            DefaultUserViewsPath = Path.Combine(RootFolderPath, "default");
+            DefaultInternalMetadataPath = Path.Combine(ProgramDataPath, "metadata");
             InternalMetadataPath = DefaultInternalMetadataPath;
         }
 
@@ -32,13 +36,13 @@ namespace Emby.Server.Implementations
         /// Gets the path to the base root media directory.
         /// </summary>
         /// <value>The root folder path.</value>
-        public string RootFolderPath => Path.Combine(ProgramDataPath, "root");
+        public string RootFolderPath { get; }
 
         /// <summary>
         /// Gets the path to the default user view directory.  Used if no specific user view is defined.
         /// </summary>
         /// <value>The default user views path.</value>
-        public string DefaultUserViewsPath => Path.Combine(RootFolderPath, "default");
+        public string DefaultUserViewsPath { get; }
 
         /// <summary>
         /// Gets the path to the People directory.
@@ -98,7 +102,7 @@ namespace Emby.Server.Implementations
         public string UserConfigurationDirectoryPath => Path.Combine(ConfigurationDirectoryPath, "users");
 
         /// <inheritdoc/>
-        public string DefaultInternalMetadataPath => Path.Combine(ProgramDataPath, "metadata");
+        public string DefaultInternalMetadataPath { get; }
 
         /// <inheritdoc />
         public string InternalMetadataPath { get; set; }

MediaBrowser.Common/Extensions/StringBuilderExtensions.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using System.Text;
+
+namespace MediaBrowser.Common.Extensions
+{
+    /// <summary>
+    /// Extension methods for the <see cref="StringBuilder"/> class.
+    /// </summary>
+    public static class StringBuilderExtensions
+    {
+        /// <summary>
+        /// Concatenates and appends the members of a collection in single quotes using the specified delimiter.
+        /// </summary>
+        /// <param name="builder">The string builder.</param>
+        /// <param name="delimiter">The character delimiter.</param>
+        /// <param name="values">The collection of strings to concatenate.</param>
+        /// <returns>The updated string builder.</returns>
+        public static StringBuilder AppendJoinInSingleQuotes(this StringBuilder builder, char delimiter, IReadOnlyList<string> values)
+        {
+            var len = values.Count;
+            for (var i = 0; i < len; i++)
+            {
+                builder.Append('\'')
+                    .Append(values[i])
+                    .Append('\'')
+                    .Append(delimiter);
+            }
+
+            // remove last ,
+            builder.Length--;
+
+            return builder;
+        }
+    }
+}

MediaBrowser.Controller/BaseItemManager/BaseItemManager.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Linq;
 using System.Threading;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Channels;
 using MediaBrowser.Controller.Configuration;
 using MediaBrowser.Controller.Entities;
@@ -52,7 +53,7 @@ namespace MediaBrowser.Controller.BaseItemManager
             var typeOptions = libraryOptions.GetTypeOptions(baseItem.GetType().Name);
             if (typeOptions != null)
             {
-                return typeOptions.MetadataFetchers.Contains(name, StringComparer.OrdinalIgnoreCase);
+                return typeOptions.MetadataFetchers.Contains(name.AsSpan(), StringComparison.OrdinalIgnoreCase);
             }
 
             if (!libraryOptions.EnableInternetProviders)
@@ -62,7 +63,7 @@ namespace MediaBrowser.Controller.BaseItemManager
 
             var itemConfig = _serverConfigurationManager.Configuration.MetadataOptions.FirstOrDefault(i => string.Equals(i.ItemType, GetType().Name, StringComparison.OrdinalIgnoreCase));
 
-            return itemConfig == null || !itemConfig.DisabledMetadataFetchers.Contains(name, StringComparer.OrdinalIgnoreCase);
+            return itemConfig == null || !itemConfig.DisabledMetadataFetchers.Contains(name.AsSpan(), StringComparison.OrdinalIgnoreCase);
         }
 
         /// <inheritdoc />
@@ -83,7 +84,7 @@ namespace MediaBrowser.Controller.BaseItemManager
             var typeOptions = libraryOptions.GetTypeOptions(baseItem.GetType().Name);
             if (typeOptions != null)
             {
-                return typeOptions.ImageFetchers.Contains(name, StringComparer.OrdinalIgnoreCase);
+                return typeOptions.ImageFetchers.Contains(name.AsSpan(), StringComparison.OrdinalIgnoreCase);
             }
 
             if (!libraryOptions.EnableInternetProviders)
@@ -93,7 +94,7 @@ namespace MediaBrowser.Controller.BaseItemManager
 
             var itemConfig = _serverConfigurationManager.Configuration.MetadataOptions.FirstOrDefault(i => string.Equals(i.ItemType, GetType().Name, StringComparison.OrdinalIgnoreCase));
 
-            return itemConfig == null || !itemConfig.DisabledImageFetchers.Contains(name, StringComparer.OrdinalIgnoreCase);
+            return itemConfig == null || !itemConfig.DisabledImageFetchers.Contains(name.AsSpan(), StringComparison.OrdinalIgnoreCase);
         }
 
         /// <summary>

MediaBrowser.Controller/Entities/BaseItem.cs

@@ -670,14 +670,12 @@ namespace MediaBrowser.Controller.Entities
         {
             if (SourceType == SourceType.Channel)
             {
-                return System.IO.Path.Combine(basePath, "channels", ChannelId.ToString("N", CultureInfo.InvariantCulture), Id.ToString("N", CultureInfo.InvariantCulture));
+                return System.IO.Path.Join(basePath, "channels", ChannelId.ToString("N", CultureInfo.InvariantCulture), Id.ToString("N", CultureInfo.InvariantCulture));
             }
 
             ReadOnlySpan<char> idString = Id.ToString("N", CultureInfo.InvariantCulture);
 
-            basePath = System.IO.Path.Combine(basePath, "library");
-
-            return System.IO.Path.Join(basePath, idString.Slice(0, 2), idString);
+            return System.IO.Path.Join(basePath, "library", idString.Slice(0, 2), idString);
         }
 
         /// <summary>
@@ -1262,7 +1260,7 @@ namespace MediaBrowser.Controller.Entities
 
             // Support plex/xbmc convention
             files.AddRange(fileSystemChildren
-                .Where(i => !i.IsDirectory && string.Equals(FileSystem.GetFileNameWithoutExtension(i), ThemeSongFilename, StringComparison.OrdinalIgnoreCase)));
+                .Where(i => !i.IsDirectory && System.IO.Path.GetFileNameWithoutExtension(i.FullName.AsSpan()).Equals(ThemeSongFilename, StringComparison.OrdinalIgnoreCase)));
 
             return LibraryManager.ResolvePaths(files, directoryService, null, new LibraryOptions())
                 .OfType<Audio.Audio>()
@@ -1323,14 +1321,16 @@ namespace MediaBrowser.Controller.Entities
         {
             var extras = new List<Video>();
 
-            var folders = fileSystemChildren.Where(i => i.IsDirectory).ToArray();
+            var libraryOptions = new LibraryOptions();
+            var folders = fileSystemChildren.Where(i => i.IsDirectory).ToList();
             foreach (var extraFolderName in AllExtrasTypesFolderNames)
             {
                 var files = folders
                     .Where(i => string.Equals(i.Name, extraFolderName, StringComparison.OrdinalIgnoreCase))
                     .SelectMany(i => FileSystem.GetFiles(i.FullName));
 
-                extras.AddRange(LibraryManager.ResolvePaths(files, directoryService, null, new LibraryOptions())
+                // Re-using the same instance of LibraryOptions since it looks like it's never being altered.
+                extras.AddRange(LibraryManager.ResolvePaths(files, directoryService, null, libraryOptions)
                     .OfType<Video>()
                     .Select(item =>
                     {
@@ -2327,7 +2327,7 @@ namespace MediaBrowser.Controller.Entities
                 .Where(i => i.IsLocalFile)
                 .Select(i => System.IO.Path.GetDirectoryName(i.Path))
                 .Distinct(StringComparer.OrdinalIgnoreCase)
-                .SelectMany(directoryService.GetFilePaths)
+                .SelectMany(path => directoryService.GetFilePaths(path))
                 .ToList();
 
             var deletedImages = ImageInfos
@@ -2436,7 +2436,15 @@ namespace MediaBrowser.Controller.Entities
                 throw new ArgumentException("No image info for chapter images");
             }
 
-            return ImageInfos.Where(i => i.Type == imageType);
+            // Yield return is more performant than LINQ Where on an Array
+            for (var i = 0; i < ImageInfos.Length; i++)
+            {
+                var imageInfo = ImageInfos[i];
+                if (imageInfo.Type == imageType)
+                {
+                    yield return imageInfo;
+                }
+            }
         }
 
         /// <summary>
@@ -2468,7 +2476,7 @@ namespace MediaBrowser.Controller.Entities
                 }
 
                 var existing = existingImages
-                    .FirstOrDefault(i => string.Equals(i.Path, newImage.FullName, StringComparison.OrdinalIgnoreCase));
+                    .Find(i => string.Equals(i.Path, newImage.FullName, StringComparison.OrdinalIgnoreCase));
 
                 if (existing == null)
                 {
@@ -2499,8 +2507,7 @@ namespace MediaBrowser.Controller.Entities
                 var newImagePaths = images.Select(i => i.FullName).ToList();
 
                 var deleted = existingImages
-                    .Where(i => i.IsLocalFile && !newImagePaths.Contains(i.Path, StringComparer.OrdinalIgnoreCase) && !File.Exists(i.Path))
-                    .ToList();
+                    .FindAll(i => i.IsLocalFile && !newImagePaths.Contains(i.Path.AsSpan(), StringComparison.OrdinalIgnoreCase) && !File.Exists(i.Path));
 
                 if (deleted.Count > 0)
                 {

MediaBrowser.Controller/Extensions/StringExtensions.cs

@@ -22,6 +22,27 @@ namespace MediaBrowser.Controller.Extensions
             return Normalize(string.Concat(chars), NormalizationForm.FormC);
         }
 
+        /// <summary>
+        /// Counts the number of occurrences of [needle] in the string.
+        /// </summary>
+        /// <param name="value">The haystack to search in.</param>
+        /// <param name="needle">The character to search for.</param>
+        /// <returns>The number of occurrences of the [needle] character.</returns>
+        public static int CountOccurrences(this ReadOnlySpan<char> value, char needle)
+        {
+            var count = 0;
+            var length = value.Length;
+            for (var i = 0; i < length; i++)
+            {
+                if (value[i] == needle)
+                {
+                    count++;
+                }
+            }
+
+            return count;
+        }
+
         private static string Normalize(string text, NormalizationForm form, bool stripStringOnFailure = true)
         {
             if (stripStringOnFailure)

MediaBrowser.Controller/Library/ILibraryManager.cs

@@ -6,6 +6,7 @@ using System;
 using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
+using Emby.Naming.Common;
 using Jellyfin.Data.Entities;
 using Jellyfin.Data.Enums;
 using MediaBrowser.Controller.Dto;
@@ -595,5 +596,11 @@ namespace MediaBrowser.Controller.Library
         BaseItem GetParentItem(string parentId, Guid? userId);
 
         BaseItem GetParentItem(Guid? parentId, Guid? userId);
+
+        /// <summary>
+        /// Gets or creates a static instance of <see cref="NamingOptions"/>.
+        /// </summary>
+        /// <returns>An instance of the <see cref="NamingOptions"/> class.</returns>
+        NamingOptions GetNamingOptions();
     }
 }

MediaBrowser.Controller/MediaBrowser.Controller.csproj

@@ -21,8 +21,9 @@
   </ItemGroup>
 
   <ItemGroup>
-    <ProjectReference Include="..\MediaBrowser.Model\MediaBrowser.Model.csproj" />
-    <ProjectReference Include="..\MediaBrowser.Common\MediaBrowser.Common.csproj" />
+    <ProjectReference Include="../Emby.Naming/Emby.Naming.csproj" />
+    <ProjectReference Include="../MediaBrowser.Model/MediaBrowser.Model.csproj" />
+    <ProjectReference Include="../MediaBrowser.Common/MediaBrowser.Common.csproj" />
   </ItemGroup>
 
   <ItemGroup>

MediaBrowser.Controller/Providers/DirectoryService.cs

@@ -25,15 +25,16 @@ namespace MediaBrowser.Controller.Providers
 
         public FileSystemMetadata[] GetFileSystemEntries(string path)
         {
-            return _cache.GetOrAdd(path, p => _fileSystem.GetFileSystemEntries(p).ToArray());
+            return _cache.GetOrAdd(path, (p, fileSystem) => fileSystem.GetFileSystemEntries(p).ToArray(), _fileSystem);
         }
 
         public List<FileSystemMetadata> GetFiles(string path)
         {
             var list = new List<FileSystemMetadata>();
             var items = GetFileSystemEntries(path);
-            foreach (var item in items)
+            for (var i = 0; i < items.Length; i++)
             {
+                var item = items[i];
                 if (!item.IsDirectory)
                 {
                     list.Add(item);
@@ -48,10 +49,9 @@ namespace MediaBrowser.Controller.Providers
             if (!_fileCache.TryGetValue(path, out var result))
             {
                 var file = _fileSystem.GetFileInfo(path);
-                var res = file != null && file.Exists ? file : null;
-                if (res != null)
+                if (file.Exists)
                 {
-                    result = res;
+                    result = file;
                     _fileCache.TryAdd(path, result);
                 }
             }
@@ -62,14 +62,21 @@ namespace MediaBrowser.Controller.Providers
         public IReadOnlyList<string> GetFilePaths(string path)
             => GetFilePaths(path, false);
 
-        public IReadOnlyList<string> GetFilePaths(string path, bool clearCache)
+        public IReadOnlyList<string> GetFilePaths(string path, bool clearCache, bool sort = false)
         {
             if (clearCache)
             {
                 _filePathCache.TryRemove(path, out _);
             }
 
-            return _filePathCache.GetOrAdd(path, p => _fileSystem.GetFilePaths(p).ToList());
+            var filePaths = _filePathCache.GetOrAdd(path, (p, fileSystem) => fileSystem.GetFilePaths(p).ToList(), _fileSystem);
+
+            if (sort)
+            {
+                filePaths.Sort();
+            }
+
+            return filePaths;
         }
     }
 }

MediaBrowser.Controller/Providers/IDirectoryService.cs

@@ -15,6 +15,6 @@ namespace MediaBrowser.Controller.Providers
 
         IReadOnlyList<string> GetFilePaths(string path);
 
-        IReadOnlyList<string> GetFilePaths(string path, bool clearCache);
+        IReadOnlyList<string> GetFilePaths(string path, bool clearCache, bool sort = false);
     }
 }

MediaBrowser.Controller/Providers/MetadataResult.cs

@@ -12,16 +12,26 @@ namespace MediaBrowser.Controller.Providers
 {
     public class MetadataResult<T>
     {
+        // Images aren't always used so the allocation is a waste a lot of the time
+        private List<LocalImageInfo> _images;
+        private List<(string url, ImageType type)> _remoteImages;
+
         public MetadataResult()
         {
-            Images = new List<LocalImageInfo>();
-            RemoteImages = new List<(string url, ImageType type)>();
             ResultLanguage = "en";
         }
 
-        public List<LocalImageInfo> Images { get; set; }
+        public List<LocalImageInfo> Images
+        {
+            get => _images ??= new List<LocalImageInfo>();
+            set => _images = value;
+        }
 
-        public List<(string url, ImageType type)> RemoteImages { get; set; }
+        public List<(string url, ImageType type)> RemoteImages
+        {
+            get => _remoteImages ??= new List<(string url, ImageType type)>();
+            set => _remoteImages = value;
+        }
 
         public List<UserItemData> UserDataList { get; set; }
 

MediaBrowser.LocalMetadata/Images/EpisodeLocalImageProvider.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.TV;
 using MediaBrowser.Controller.Providers;
@@ -15,17 +16,6 @@ namespace MediaBrowser.LocalMetadata.Images
     /// </summary>
     public class EpisodeLocalImageProvider : ILocalImageProvider, IHasOrder
     {
-        private readonly IFileSystem _fileSystem;
-
-        /// <summary>
-        /// Initializes a new instance of the <see cref="EpisodeLocalImageProvider"/> class.
-        /// </summary>
-        /// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
-        public EpisodeLocalImageProvider(IFileSystem fileSystem)
-        {
-            _fileSystem = fileSystem;
-        }
-
         /// <inheritdoc />
         public string Name => "Local Images";
 
@@ -49,14 +39,14 @@ namespace MediaBrowser.LocalMetadata.Images
 
             var parentPathFiles = directoryService.GetFiles(parentPath);
 
-            var nameWithoutExtension = Path.GetFileNameWithoutExtension(item.Path);
+            var nameWithoutExtension = Path.GetFileNameWithoutExtension(item.Path.AsSpan());
 
             return GetFilesFromParentFolder(nameWithoutExtension, parentPathFiles);
         }
 
-        private List<LocalImageInfo> GetFilesFromParentFolder(string filenameWithoutExtension, List<FileSystemMetadata> parentPathFiles)
+        private List<LocalImageInfo> GetFilesFromParentFolder(ReadOnlySpan<char> filenameWithoutExtension, List<FileSystemMetadata> parentPathFiles)
         {
-            var thumbName = filenameWithoutExtension + "-thumb";
+            var thumbName = string.Concat(filenameWithoutExtension, "-thumb");
 
             var list = new List<LocalImageInfo>(1);
 
@@ -67,15 +57,15 @@ namespace MediaBrowser.LocalMetadata.Images
                     continue;
                 }
 
-                if (BaseItem.SupportedImageExtensions.Contains(i.Extension, StringComparer.OrdinalIgnoreCase))
+                if (BaseItem.SupportedImageExtensions.Contains(i.Extension.AsSpan(), StringComparison.OrdinalIgnoreCase))
                 {
-                    var currentNameWithoutExtension = _fileSystem.GetFileNameWithoutExtension(i);
+                    var currentNameWithoutExtension = Path.GetFileNameWithoutExtension(i.FullName.AsSpan());
 
-                    if (string.Equals(filenameWithoutExtension, currentNameWithoutExtension, StringComparison.OrdinalIgnoreCase))
+                    if (filenameWithoutExtension.Equals(currentNameWithoutExtension, StringComparison.OrdinalIgnoreCase))
                     {
                         list.Add(new LocalImageInfo { FileInfo = i, Type = ImageType.Primary });
                     }
-                    else if (string.Equals(thumbName, currentNameWithoutExtension, StringComparison.OrdinalIgnoreCase))
+                    else if (currentNameWithoutExtension.Equals(thumbName, StringComparison.OrdinalIgnoreCase))
                     {
                         list.Add(new LocalImageInfo { FileInfo = i, Type = ImageType.Primary });
                     }

MediaBrowser.Providers/Manager/ItemImageProvider.cs

@@ -32,7 +32,7 @@ namespace MediaBrowser.Providers.Manager
         /// <summary>
         /// Image types that are only one per item.
         /// </summary>
-        private readonly ImageType[] _singularImages =
+        private static readonly ImageType[] _singularImages =
         {
             ImageType.Primary,
             ImageType.Art,
@@ -208,9 +208,14 @@ namespace MediaBrowser.Providers.Manager
         /// <returns><c>true</c> if the specified item contains images; otherwise, <c>false</c>.</returns>
         private bool ContainsImages(BaseItem item, List<ImageType> images, TypeOptions savedOptions, int backdropLimit, int screenshotLimit)
         {
-            if (_singularImages.Any(i => images.Contains(i) && !HasImage(item, i) && savedOptions.GetLimit(i) > 0))
+            // Using .Any causes the creation of a DisplayClass aka. variable capture
+            for (var i = 0; i < _singularImages.Length; i++)
             {
-                return false;
+                var type = _singularImages[i];
+                if (images.Contains(type) && !HasImage(item, type) && savedOptions.GetLimit(type) > 0)
+                {
+                    return false;
+                }
             }
 
             if (images.Contains(ImageType.Backdrop) && item.GetImages(ImageType.Backdrop).Count() < backdropLimit)
@@ -329,7 +334,7 @@ namespace MediaBrowser.Providers.Manager
             var deleted = false;
             var deletedImages = new List<ItemImageInfo>();
 
-            foreach (var image in item.GetImages(type).ToList())
+            foreach (var image in item.GetImages(type))
             {
                 if (!image.IsLocalFile)
                 {
@@ -359,9 +364,10 @@ namespace MediaBrowser.Providers.Manager
         {
             var changed = false;
 
-            foreach (var type in _singularImages)
+            for (var i = 0; i < _singularImages.Length; i++)
             {
-                var image = images.FirstOrDefault(i => i.Type == type);
+                var type = _singularImages[i];
+                var image = GetFirstLocalImageInfoByType(images, type);
 
                 if (image != null)
                 {
@@ -423,15 +429,29 @@ namespace MediaBrowser.Providers.Manager
             return changed;
         }
 
+        private static LocalImageInfo GetFirstLocalImageInfoByType(IReadOnlyList<LocalImageInfo> images, ImageType type)
+        {
+            var len = images.Count;
+            for (var i = 0; i < len; i++)
+            {
+                var image = images[i];
+                if (image.Type == type)
+                {
+                    return image;
+                }
+            }
+
+            return null;
+        }
+
         private bool UpdateMultiImages(BaseItem item, List<LocalImageInfo> images, ImageType type)
         {
             var changed = false;
 
-            var newImages = images.Where(i => i.Type == type).ToList();
-
-            var newImageFileInfos = newImages
-                    .Select(i => i.FileInfo)
-                    .ToList();
+            var newImageFileInfos = images
+                .FindAll(i => i.Type == type)
+                .Select(i => i.FileInfo)
+                .ToList();
 
             if (item.AddImages(type, newImageFileInfos))
             {

MediaBrowser.Providers/Manager/MetadataService.cs

@@ -28,8 +28,11 @@ namespace MediaBrowser.Providers.Manager
             ProviderManager = providerManager;
             FileSystem = fileSystem;
             LibraryManager = libraryManager;
+            ImageProvider = new ItemImageProvider(Logger, ProviderManager, FileSystem);
         }
 
+        protected ItemImageProvider ImageProvider { get; }
+
         protected IServerConfigurationManager ServerConfigurationManager { get; }
 
         protected ILogger<MetadataService<TItemType, TIdType>> Logger { get; }
@@ -88,7 +91,6 @@ namespace MediaBrowser.Providers.Manager
                 }
             }
 
-            var itemImageProvider = new ItemImageProvider(Logger, ProviderManager, FileSystem);
             var localImagesFailed = false;
 
             var allImageProviders = ((ProviderManager)ProviderManager).GetImageProviders(item, refreshOptions).ToList();
@@ -97,7 +99,7 @@ namespace MediaBrowser.Providers.Manager
             try
             {
                 // Always validate images and check for new locally stored ones.
-                if (itemImageProvider.ValidateImages(item, allImageProviders.OfType<ILocalImageProvider>(), refreshOptions.DirectoryService))
+                if (ImageProvider.ValidateImages(item, allImageProviders.OfType<ILocalImageProvider>(), refreshOptions.DirectoryService))
                 {
                     updateType |= ItemUpdateType.ImageUpdate;
                 }
@@ -143,7 +145,7 @@ namespace MediaBrowser.Providers.Manager
                     // await FindIdentities(id, cancellationToken).ConfigureAwait(false);
                     id.IsAutomated = refreshOptions.IsAutomated;
 
-                    var result = await RefreshWithProviders(metadataResult, id, refreshOptions, providers, itemImageProvider, cancellationToken).ConfigureAwait(false);
+                    var result = await RefreshWithProviders(metadataResult, id, refreshOptions, providers, ImageProvider, cancellationToken).ConfigureAwait(false);
 
                     updateType |= result.UpdateType;
                     if (result.Failures > 0)
@@ -160,7 +162,7 @@ namespace MediaBrowser.Providers.Manager
 
                 if (providers.Count > 0)
                 {
-                    var result = await itemImageProvider.RefreshImages(itemOfType, libraryOptions, providers, refreshOptions, cancellationToken).ConfigureAwait(false);
+                    var result = await ImageProvider.RefreshImages(itemOfType, libraryOptions, providers, refreshOptions, cancellationToken).ConfigureAwait(false);
 
                     updateType |= result.UpdateType;
                     if (result.Failures > 0)
@@ -563,7 +565,7 @@ namespace MediaBrowser.Providers.Manager
         protected virtual IEnumerable<IImageProvider> GetNonLocalImageProviders(BaseItem item, IEnumerable<IImageProvider> allImageProviders, ImageRefreshOptions options)
         {
             // Get providers to refresh
-            var providers = allImageProviders.Where(i => !(i is ILocalImageProvider)).ToList();
+            var providers = allImageProviders.Where(i => !(i is ILocalImageProvider));
 
             var dateLastImageRefresh = item.DateLastRefreshed;
 
@@ -575,15 +577,13 @@ namespace MediaBrowser.Providers.Manager
                 providers = providers
                     .Where(i =>
                     {
-                        var hasFileChangeMonitor = i as IHasItemChangeMonitor;
-                        if (hasFileChangeMonitor != null)
+                        if (i is IHasItemChangeMonitor hasFileChangeMonitor)
                         {
                             return HasChanged(item, hasFileChangeMonitor, options.DirectoryService);
                         }
 
                         return false;
-                    })
-                    .ToList();
+                    });
             }
 
             return providers;

MediaBrowser.Providers/MediaInfo/SubtitleResolver.cs

@@ -3,7 +3,6 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Linq;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Providers;
 using MediaBrowser.Model.Entities;
@@ -55,38 +54,35 @@ namespace MediaBrowser.Providers.MediaInfo
             return streams;
         }
 
-        public List<string> GetExternalSubtitleFiles(
+        public IEnumerable<string> GetExternalSubtitleFiles(
             Video video,
             IDirectoryService directoryService,
             bool clearCache)
         {
-            var list = new List<string>();
-
             if (!video.IsFileProtocol)
             {
-                return list;
+                yield break;
             }
 
             var streams = GetExternalSubtitleStreams(video, 0, directoryService, clearCache);
 
             foreach (var stream in streams)
             {
-                list.Add(stream.Path);
+                yield return stream.Path;
             }
-
-            return list;
         }
 
         public void AddExternalSubtitleStreams(
             List<MediaStream> streams,
             string videoPath,
             int startIndex,
-            string[] files)
+            IReadOnlyList<string> files)
         {
             var videoFileNameWithoutExtension = NormalizeFilenameForSubtitleComparison(videoPath);
 
-            foreach (var fullName in files)
+            for (var i = 0; i < files.Count; i++)
             {
+                var fullName = files[i];
                 var extension = Path.GetExtension(fullName.AsSpan());
                 if (!IsSubtitleExtension(extension))
                 {
@@ -135,15 +131,12 @@ namespace MediaBrowser.Providers.MediaInfo
                         break;
                     }
 
-                    var language = languageSpan.ToString();
                     // Try to translate to three character code
                     // Be flexible and check against both the full and three character versions
+                    var language = languageSpan.ToString();
                     var culture = _localization.FindLanguageInfo(language);
 
-                    if (culture != null)
-                    {
-                        language = culture.ThreeLetterISOLanguageName;
-                    }
+                    language = culture == null ? language : culture.ThreeLetterISOLanguageName;
 
                     mediaStream = new MediaStream
                     {
@@ -194,7 +187,7 @@ namespace MediaBrowser.Providers.MediaInfo
             IDirectoryService directoryService,
             bool clearCache)
         {
-            var files = directoryService.GetFilePaths(folder, clearCache).OrderBy(i => i).ToArray();
+            var files = directoryService.GetFilePaths(folder, clearCache, true);
 
             AddExternalSubtitleStreams(streams, videoPath, startIndex, files);
         }

RSSDP/SsdpCommunicationsServer.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
@@ -42,7 +43,7 @@ namespace Rssdp.Infrastructure
         private HttpResponseParser _ResponseParser;
         private readonly ILogger _logger;
         private ISocketFactory _SocketFactory;
-        private readonly INetworkManager _networkManager;        
+        private readonly INetworkManager _networkManager;
 
         private int _LocalPort;
         private int _MulticastTtl;
@@ -68,7 +69,7 @@ namespace Rssdp.Infrastructure
             INetworkManager networkManager, ILogger logger, bool enableMultiSocketBinding)
             : this(socketFactory, 0, SsdpConstants.SsdpDefaultMulticastTimeToLive, networkManager, logger, enableMultiSocketBinding)
         {
-            
+
         }
 
         /// <summary>
@@ -358,7 +359,7 @@ namespace Rssdp.Infrastructure
                     {
                         // Not support IPv6 right now
                         continue;
-                    }                  
+                    }
 
                     try
                     {

tests/Jellyfin.Naming.Tests/Video/CleanDateTimeTests.cs

@@ -58,7 +58,7 @@ namespace Jellyfin.Naming.Tests.Video
         {
             input = Path.GetFileName(input);
 
-            var result = new VideoResolver(_namingOptions).CleanDateTime(input);
+            var result = VideoResolver.CleanDateTime(input, _namingOptions);
 
             Assert.Equal(expectedName, result.Name, true);
             Assert.Equal(expectedYear, result.Year);

tests/Jellyfin.Naming.Tests/Video/CleanStringTests.cs

@@ -7,7 +7,7 @@ namespace Jellyfin.Naming.Tests.Video
 {
     public sealed class CleanStringTests
     {
-        private readonly VideoResolver _videoResolver = new VideoResolver(new NamingOptions());
+        private readonly NamingOptions _namingOptions = new NamingOptions();
 
         [Theory]
         [InlineData("Super movie 480p.mp4", "Super movie")]
@@ -26,7 +26,7 @@ namespace Jellyfin.Naming.Tests.Video
         // FIXME: [InlineData("After The Sunset - [0004].mkv", "After The Sunset")]
         public void CleanStringTest_NeedsCleaning_Success(string input, string expectedName)
         {
-            Assert.True(_videoResolver.TryCleanString(input, out ReadOnlySpan<char> newName));
+            Assert.True(VideoResolver.TryCleanString(input, _namingOptions, out ReadOnlySpan<char> newName));
             // TODO: compare spans when XUnit supports it
             Assert.Equal(expectedName, newName.ToString());
         }
@@ -41,7 +41,7 @@ namespace Jellyfin.Naming.Tests.Video
         [InlineData("Run lola run (lola rennt) (2009).mp4")]
         public void CleanStringTest_DoesntNeedCleaning_False(string? input)
         {
-            Assert.False(_videoResolver.TryCleanString(input, out ReadOnlySpan<char> newName));
+            Assert.False(VideoResolver.TryCleanString(input, _namingOptions, out ReadOnlySpan<char> newName));
             Assert.True(newName.IsEmpty);
         }
     }

tests/Jellyfin.Naming.Tests/Video/ExtraTests.cs

@@ -104,13 +104,6 @@ namespace Jellyfin.Naming.Tests.Video
             Assert.Equal(rule, res.Rule);
         }
 
-        [Fact]
-        public void TestFlagsParser()
-        {
-            var flags = new FlagParser(_videoOptions).GetFlags(string.Empty);
-            Assert.Empty(flags);
-        }
-
         private ExtraResolver GetExtraTypeParser(NamingOptions videoOptions)
         {
             return new ExtraResolver(videoOptions);

tests/Jellyfin.Naming.Tests/Video/Format3DTests.cs

@@ -22,8 +22,7 @@ namespace Jellyfin.Naming.Tests.Video
         [Fact]
         public void Test3DName()
         {
-            var result =
-                new VideoResolver(_namingOptions).ResolveFile(@"C:/Users/media/Desktop/Video Test/Movies/Oblivion/Oblivion.3d.hsbs.mkv");
+            var result = VideoResolver.ResolveFile(@"C:/Users/media/Desktop/Video Test/Movies/Oblivion/Oblivion.3d.hsbs.mkv", _namingOptions);
 
             Assert.Equal("hsbs", result?.Format3D);
             Assert.Equal("Oblivion", result?.Name);
@@ -58,15 +57,13 @@ namespace Jellyfin.Naming.Tests.Video
 
         private void Test(string input, bool is3D, string? format3D)
         {
-            var parser = new Format3DParser(_namingOptions);
-
-            var result = parser.Parse(input);
+            var result = Format3DParser.Parse(input, _namingOptions);
 
             Assert.Equal(is3D, result.Is3D);
 
             if (format3D == null)
             {
-                Assert.Null(result.Format3D);
+                Assert.Null(result?.Format3D);
             }
             else
             {

tests/Jellyfin.Naming.Tests/Video/MultiVersionTests.cs

@@ -9,7 +9,7 @@ namespace Jellyfin.Naming.Tests.Video
 {
     public class MultiVersionTests
     {
-        private readonly VideoListResolver _videoListResolver = new VideoListResolver(new NamingOptions());
+        private readonly NamingOptions _namingOptions = new NamingOptions();
 
         [Fact]
         public void TestMultiEdition1()
@@ -22,11 +22,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/X-Men Days of Future Past/X-Men Days of Future Past [hsbs].mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Single(result[0].Extras);
@@ -43,11 +45,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/X-Men Days of Future Past/X-Men Days of Future Past [banana].mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Single(result[0].Extras);
@@ -63,11 +67,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/The Phantom of the Opera (1925)/The Phantom of the Opera (1925) - 1929 version.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Single(result[0].AlternateVersions);
@@ -87,11 +93,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/M/Movie 7.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(7, result.Count);
             Assert.Empty(result[0].Extras);
@@ -113,11 +121,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Movie/Movie-8.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -140,11 +150,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Mo/Movie 9.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(9, result.Count);
             Assert.Empty(result[0].Extras);
@@ -163,11 +175,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Movie/Movie 5.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(5, result.Count);
             Assert.Empty(result[0].Extras);
@@ -188,11 +202,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man (2011).mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(5, result.Count);
             Assert.Empty(result[0].Extras);
@@ -214,11 +230,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man[test].mkv",
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -243,11 +261,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man [test].mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -266,11 +286,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man - C (2007).mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(2, result.Count);
         }
@@ -289,11 +311,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man_3d.hsbs.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(7, result.Count);
             Assert.Empty(result[0].Extras);
@@ -314,11 +338,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Iron Man/Iron Man (2011).mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(5, result.Count);
             Assert.Empty(result[0].Extras);
@@ -334,11 +360,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/Blade Runner (1982)/Blade Runner (1982) [EE by ADM] [480p HEVC AAC,AAC,AAC].mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -354,11 +382,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/X-Men Apocalypse (2016)/X-Men Apocalypse (2016) [2160p] Blu-ray.x265.AAC.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -374,11 +404,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/John Wick - Kapitel 3 (2019) [imdbid=tt6146586]/John Wick - Kapitel 3 (2019) [imdbid=tt6146586] - Version 2.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
             Assert.Empty(result[0].Extras);
@@ -394,11 +426,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/movies/John Wick - Chapter 3 (2019)/John Wick - Chapter 3 (2019) [Version 2.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(2, result.Count);
         }
@@ -406,7 +440,7 @@ namespace Jellyfin.Naming.Tests.Video
         [Fact]
         public void TestEmptyList()
         {
-            var result = _videoListResolver.Resolve(new List<FileSystemMetadata>()).ToList();
+            var result = VideoListResolver.Resolve(new List<FileSystemMetadata>(), _namingOptions).ToList();
 
             Assert.Empty(result);
         }

tests/Jellyfin.Naming.Tests/Video/StubTests.cs

@@ -29,8 +29,7 @@ namespace Jellyfin.Naming.Tests.Video
         [Fact]
         public void TestStubName()
         {
-            var result =
-                new VideoResolver(_namingOptions).ResolveFile(@"C:/Users/media/Desktop/Video Test/Movies/Oblivion/Oblivion.dvd.disc");
+            var result = VideoResolver.ResolveFile(@"C:/Users/media/Desktop/Video Test/Movies/Oblivion/Oblivion.dvd.disc", _namingOptions);
 
             Assert.Equal("Oblivion", result?.Name);
         }

tests/Jellyfin.Naming.Tests/Video/VideoListResolverTests.cs

@@ -9,7 +9,7 @@ namespace Jellyfin.Naming.Tests.Video
 {
     public class VideoListResolverTests
     {
-        private readonly VideoListResolver _videoListResolver = new VideoListResolver(new NamingOptions());
+        private readonly NamingOptions _namingOptions = new NamingOptions();
 
         [Fact]
         public void TestStackAndExtras()
@@ -40,11 +40,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "WillyWonka-trailer.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(5, result.Count);
             var batman = result.FirstOrDefault(x => string.Equals(x.Name, "Batman", StringComparison.Ordinal));
@@ -67,11 +69,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "300.nfo"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -85,11 +89,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "300 trailer.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -103,11 +109,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "X-Men Days of Future Past-trailer.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -122,11 +130,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "X-Men Days of Future Past-trailer2.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -140,11 +150,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "Looper.2012.bluray.720p.x264.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -162,11 +174,13 @@ namespace Jellyfin.Naming.Tests.Video
                 "My video 5.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(5, result.Count);
         }
@@ -180,11 +194,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"M:/Movies (DVD)/Movies (Musical)/Sound of Music (1965)/Sound of Music Disc 2"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = true,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = true,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -199,11 +215,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"My movie #2.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = true,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = true,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(2, result.Count);
         }
@@ -218,11 +236,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"No (2012) part1-trailer.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -237,11 +257,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"No (2012)-trailer.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -257,11 +279,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"trailer.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -277,11 +301,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/MCFAMILY-PC/Private3$/Heterosexual/Breast In Class 2 Counterfeit Racks (2011)/Breast In Class 2 Disc 2 cd2.avi"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(2, result.Count);
         }
@@ -294,11 +320,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/nas-markrobbo78/Videos/INDEX HTPC/Movies/Watched/3 - ACTION/Argo (2012)/movie.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -311,11 +339,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"The Colony.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -329,11 +359,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"Four Sisters and a Wedding - B.avi"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -347,11 +379,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"Four Rooms - A.mp4"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(2, result.Count);
         }
@@ -365,11 +399,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/Server/Despicable Me/movie-trailer.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }
@@ -385,11 +421,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/Server/Despicable Me/Baywatch (2017) - Trailer.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Equal(4, result.Count);
         }
@@ -403,11 +441,13 @@ namespace Jellyfin.Naming.Tests.Video
                 @"/Movies/Despicable Me/trailers/trailer.mkv"
             };
 
-            var result = _videoListResolver.Resolve(files.Select(i => new FileSystemMetadata
-            {
-                IsDirectory = false,
-                FullName = i
-            }).ToList()).ToList();
+            var result = VideoListResolver.Resolve(
+                files.Select(i => new FileSystemMetadata
+                {
+                    IsDirectory = false,
+                    FullName = i
+                }).ToList(),
+                _namingOptions).ToList();
 
             Assert.Single(result);
         }

tests/Jellyfin.Naming.Tests/Video/VideoResolverTests.cs

@@ -9,7 +9,7 @@ namespace Jellyfin.Naming.Tests.Video
 {
     public class VideoResolverTests
     {
-        private readonly VideoResolver _videoResolver = new VideoResolver(new NamingOptions());
+        private static NamingOptions _namingOptions = new NamingOptions();
 
         public static IEnumerable<object[]> ResolveFile_ValidFileNameTestData()
         {
@@ -159,27 +159,27 @@ namespace Jellyfin.Naming.Tests.Video
         [MemberData(nameof(ResolveFile_ValidFileNameTestData))]
         public void ResolveFile_ValidFileName_Success(VideoFileInfo expectedResult)
         {
-            var result = _videoResolver.ResolveFile(expectedResult.Path);
+            var result = VideoResolver.ResolveFile(expectedResult.Path, _namingOptions);
 
             Assert.NotNull(result);
-            Assert.Equal(result?.Path, expectedResult.Path);
-            Assert.Equal(result?.Container, expectedResult.Container);
-            Assert.Equal(result?.Name, expectedResult.Name);
-            Assert.Equal(result?.Year, expectedResult.Year);
-            Assert.Equal(result?.ExtraType, expectedResult.ExtraType);
-            Assert.Equal(result?.Format3D, expectedResult.Format3D);
-            Assert.Equal(result?.Is3D, expectedResult.Is3D);
-            Assert.Equal(result?.IsStub, expectedResult.IsStub);
-            Assert.Equal(result?.StubType, expectedResult.StubType);
-            Assert.Equal(result?.IsDirectory, expectedResult.IsDirectory);
-            Assert.Equal(result?.FileNameWithoutExtension, expectedResult.FileNameWithoutExtension);
-            Assert.Equal(result?.ToString(), expectedResult.ToString());
+            Assert.Equal(result!.Path, expectedResult.Path);
+            Assert.Equal(result.Container, expectedResult.Container);
+            Assert.Equal(result.Name, expectedResult.Name);
+            Assert.Equal(result.Year, expectedResult.Year);
+            Assert.Equal(result.ExtraType, expectedResult.ExtraType);
+            Assert.Equal(result.Format3D, expectedResult.Format3D);
+            Assert.Equal(result.Is3D, expectedResult.Is3D);
+            Assert.Equal(result.IsStub, expectedResult.IsStub);
+            Assert.Equal(result.StubType, expectedResult.StubType);
+            Assert.Equal(result.IsDirectory, expectedResult.IsDirectory);
+            Assert.Equal(result.FileNameWithoutExtension.ToString(), expectedResult.FileNameWithoutExtension.ToString());
+            Assert.Equal(result.ToString(), expectedResult.ToString());
         }
 
         [Fact]
         public void ResolveFile_EmptyPath()
         {
-            var result = _videoResolver.ResolveFile(string.Empty);
+            var result = VideoResolver.ResolveFile(string.Empty, _namingOptions);
 
             Assert.Null(result);
         }
@@ -194,7 +194,7 @@ namespace Jellyfin.Naming.Tests.Video
                 string.Empty
             };
 
-            var results = paths.Select(path => _videoResolver.ResolveDirectory(path)).ToList();
+            var results = paths.Select(path => VideoResolver.ResolveDirectory(path, _namingOptions)).ToList();
 
             Assert.Equal(3, results.Count);
             Assert.NotNull(results[0]);

tests/Jellyfin.Server.Implementations.Tests/Data/SqliteItemRepositoryTests.cs

@@ -166,6 +166,38 @@ namespace Jellyfin.Server.Implementations.Tests.Data
             };
         }
 
+        public static IEnumerable<object[]> DeserializeImages_ValidAndInvalid_TestData()
+        {
+            yield return new object[]
+            {
+                string.Empty,
+                Array.Empty<ItemImageInfo>()
+            };
+
+            yield return new object[]
+            {
+                "/mnt/series/Family Guy/Season 1/Family Guy - S01E01-thumb.jpg*637452096478512963*Primary*1920*1080*WjQbtJtSO8nhNZ%L_Io#R/oaS6o}-;adXAoIn7j[%hW9s:WGw[nN|test|1234||ss",
+                new ItemImageInfo[]
+                {
+                    new ()
+                    {
+                        Path = "/mnt/series/Family Guy/Season 1/Family Guy - S01E01-thumb.jpg",
+                        Type = ImageType.Primary,
+                        DateModified = new DateTime(637452096478512963, DateTimeKind.Utc),
+                        Width = 1920,
+                        Height = 1080,
+                        BlurHash = "WjQbtJtSO8nhNZ%L_Io#R*oaS6o}-;adXAoIn7j[%hW9s:WGw[nN"
+                    }
+                }
+            };
+
+            yield return new object[]
+            {
+                "|",
+                Array.Empty<ItemImageInfo>()
+            };
+        }
+
         [Theory]
         [MemberData(nameof(DeserializeImages_Valid_TestData))]
         public void DeserializeImages_Valid_Success(string value, ItemImageInfo[] expected)
@@ -183,6 +215,23 @@ namespace Jellyfin.Server.Implementations.Tests.Data
             }
         }
 
+        [Theory]
+        [MemberData(nameof(DeserializeImages_ValidAndInvalid_TestData))]
+        public void DeserializeImages_ValidAndInvalid_Success(string value, ItemImageInfo[] expected)
+        {
+            var result = _sqliteItemRepository.DeserializeImages(value);
+            Assert.Equal(expected.Length, result.Length);
+            for (int i = 0; i < expected.Length; i++)
+            {
+                Assert.Equal(expected[i].Path, result[i].Path);
+                Assert.Equal(expected[i].Type, result[i].Type);
+                Assert.Equal(expected[i].DateModified, result[i].DateModified);
+                Assert.Equal(expected[i].Width, result[i].Width);
+                Assert.Equal(expected[i].Height, result[i].Height);
+                Assert.Equal(expected[i].BlurHash, result[i].BlurHash);
+            }
+        }
+
         [Theory]
         [MemberData(nameof(DeserializeImages_Valid_TestData))]
         public void SerializeImages_Valid_Success(string expected, ItemImageInfo[] value)