Revert "Backport pull request #8087 from jellyfin/release-10.8.z"

This reverts commit 38eefbb.

Emby.Server.Implementations/ApplicationHost.cs

@@ -597,8 +597,7 @@ protected virtual void RegisterServices(IServiceCollection serviceCollection)
             serviceCollection.AddSingleton<IAuthService, AuthService>();
             serviceCollection.AddSingleton<IQuickConnect, QuickConnectManager>();
 
-            serviceCollection.AddSingleton<ISubtitleParser, SubtitleEditParser>();
-            serviceCollection.AddSingleton<ISubtitleEncoder, SubtitleEncoder>();
+            serviceCollection.AddSingleton<ISubtitleEncoder, MediaBrowser.MediaEncoding.Subtitles.SubtitleEncoder>();
 
             serviceCollection.AddSingleton<IAttachmentExtractor, MediaBrowser.MediaEncoding.Attachments.AttachmentExtractor>();
 

MediaBrowser.MediaEncoding/Subtitles/AssParser.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+using Nikse.SubtitleEdit.Core.SubtitleFormats;
+
+namespace MediaBrowser.MediaEncoding.Subtitles
+{
+    /// <summary>
+    /// Advanced SubStation Alpha subtitle parser.
+    /// </summary>
+    public class AssParser : SubtitleEditParser<AdvancedSubStationAlpha>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="AssParser"/> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        public AssParser(ILogger logger) : base(logger)
+        {
+        }
+    }
+}

MediaBrowser.MediaEncoding/Subtitles/ISubtitleParser.cs

@@ -1,6 +1,7 @@
 #pragma warning disable CS1591
 
 using System.IO;
+using System.Threading;
 using MediaBrowser.Model.MediaInfo;
 
 namespace MediaBrowser.MediaEncoding.Subtitles
@@ -11,15 +12,8 @@ public interface ISubtitleParser
         /// Parses the specified stream.
         /// </summary>
         /// <param name="stream">The stream.</param>
-        /// <param name="fileExtension">The file extension.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
         /// <returns>SubtitleTrackInfo.</returns>
-        SubtitleTrackInfo Parse(Stream stream, string fileExtension);
-
-        /// <summary>
-        /// Determines whether the file extension is supported by the parser.
-        /// </summary>
-        /// <param name="fileExtension">The file extension.</param>
-        /// <returns>A value indicating whether the file extension is supported.</returns>
-        bool SupportsFileExtension(string fileExtension);
+        SubtitleTrackInfo Parse(Stream stream, CancellationToken cancellationToken);
     }
 }

MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+using Nikse.SubtitleEdit.Core.SubtitleFormats;
+
+namespace MediaBrowser.MediaEncoding.Subtitles
+{
+    /// <summary>
+    /// SubRip subtitle parser.
+    /// </summary>
+    public class SrtParser : SubtitleEditParser<SubRip>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SrtParser"/> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        public SrtParser(ILogger logger) : base(logger)
+        {
+        }
+    }
+}

MediaBrowser.MediaEncoding/Subtitles/SsaParser.cs

@@ -0,0 +1,19 @@
+using Microsoft.Extensions.Logging;
+using Nikse.SubtitleEdit.Core.SubtitleFormats;
+
+namespace MediaBrowser.MediaEncoding.Subtitles
+{
+    /// <summary>
+    /// SubStation Alpha subtitle parser.
+    /// </summary>
+    public class SsaParser : SubtitleEditParser<SubStationAlpha>
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="SsaParser"/> class.
+        /// </summary>
+        /// <param name="logger">The logger.</param>
+        public SsaParser(ILogger logger) : base(logger)
+        {
+        }
+    }
+}

MediaBrowser.MediaEncoding/Subtitles/SubtitleEditParser.cs

@@ -1,70 +1,44 @@
-using System;
-using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.Linq;
+using System.Threading;
 using Jellyfin.Extensions;
 using MediaBrowser.Model.MediaInfo;
 using Microsoft.Extensions.Logging;
 using Nikse.SubtitleEdit.Core.Common;
+using ILogger = Microsoft.Extensions.Logging.ILogger;
 using SubtitleFormat = Nikse.SubtitleEdit.Core.SubtitleFormats.SubtitleFormat;
 
 namespace MediaBrowser.MediaEncoding.Subtitles
 {
     /// <summary>
     /// SubStation Alpha subtitle parser.
     /// </summary>
-    public class SubtitleEditParser : ISubtitleParser
+    /// <typeparam name="T">The <see cref="SubtitleFormat" />.</typeparam>
+    public abstract class SubtitleEditParser<T> : ISubtitleParser
+        where T : SubtitleFormat, new()
     {
-        private readonly ILogger<SubtitleEditParser> _logger;
-        private readonly Dictionary<string, SubtitleFormat[]> _subtitleFormats;
+        private readonly ILogger _logger;
 
         /// <summary>
-        /// Initializes a new instance of the <see cref="SubtitleEditParser"/> class.
+        /// Initializes a new instance of the <see cref="SubtitleEditParser{T}"/> class.
         /// </summary>
         /// <param name="logger">The logger.</param>
-        public SubtitleEditParser(ILogger<SubtitleEditParser> logger)
+        protected SubtitleEditParser(ILogger logger)
         {
             _logger = logger;
-            _subtitleFormats = GetSubtitleFormats()
-                .Where(subtitleFormat => !string.IsNullOrEmpty(subtitleFormat.Extension))
-                .GroupBy(subtitleFormat => subtitleFormat.Extension.TrimStart('.'), StringComparer.OrdinalIgnoreCase)
-                .ToDictionary(g => g.Key, g => g.ToArray(), StringComparer.OrdinalIgnoreCase);
         }
 
         /// <inheritdoc />
-        public SubtitleTrackInfo Parse(Stream stream, string fileExtension)
+        public SubtitleTrackInfo Parse(Stream stream, CancellationToken cancellationToken)
         {
             var subtitle = new Subtitle();
+            var subRip = new T();
             var lines = stream.ReadAllLines().ToList();
-
-            if (!_subtitleFormats.TryGetValue(fileExtension, out var subtitleFormats))
-            {
-                throw new ArgumentException($"Unsupported file extension: {fileExtension}", nameof(fileExtension));
-            }
-
-            foreach (var subtitleFormat in subtitleFormats)
+            subRip.LoadSubtitle(subtitle, lines, "untitled");
+            if (subRip.ErrorCount > 0)
             {
-                _logger.LogDebug(
-                    "Trying to parse '{FileExtension}' subtitle using the {SubtitleFormatParser} format parser",
-                    fileExtension,
-                    subtitleFormat.Name);
-                subtitleFormat.LoadSubtitle(subtitle, lines, fileExtension);
-                if (subtitleFormat.ErrorCount == 0)
-                {
-                    break;
-                }
-
-                _logger.LogError(
-                    "{ErrorCount} errors encountered while parsing '{FileExtension}' subtitle using the {SubtitleFormatParser} format parser",
-                    subtitleFormat.ErrorCount,
-                    fileExtension,
-                    subtitleFormat.Name);
-            }
-
-            if (subtitle.Paragraphs.Count == 0)
-            {
-                throw new ArgumentException("Unsupported format: " + fileExtension);
+                _logger.LogError("{ErrorCount} errors encountered while parsing subtitle", subRip.ErrorCount);
             }
 
             var trackInfo = new SubtitleTrackInfo();
@@ -83,36 +57,5 @@ public SubtitleTrackInfo Parse(Stream stream, string fileExtension)
             trackInfo.TrackEvents = trackEvents;
             return trackInfo;
         }
-
-        /// <inheritdoc />
-        public bool SupportsFileExtension(string fileExtension)
-            => _subtitleFormats.ContainsKey(fileExtension);
-
-        private IEnumerable<SubtitleFormat> GetSubtitleFormats()
-        {
-            var subtitleFormats = new List<SubtitleFormat>();
-            var assembly = typeof(SubtitleFormat).Assembly;
-
-            foreach (var type in assembly.GetTypes())
-            {
-                if (!type.IsSubclassOf(typeof(SubtitleFormat)) || type.IsAbstract)
-                {
-                    continue;
-                }
-
-                try
-                {
-                    // It shouldn't be null, but the exception is caught if it is
-                    var subtitleFormat = (SubtitleFormat)Activator.CreateInstance(type, true)!;
-                    subtitleFormats.Add(subtitleFormat);
-                }
-                catch (Exception ex)
-                {
-                    _logger.LogWarning(ex, "Failed to create instance of the subtitle format {SubtitleFormatType}", type.Name);
-                }
-            }
-
-            return subtitleFormats;
-        }
     }
 }

MediaBrowser.MediaEncoding/Subtitles/SubtitleEncoder.cs

@@ -35,7 +35,6 @@ public sealed class SubtitleEncoder : ISubtitleEncoder
         private readonly IMediaEncoder _mediaEncoder;
         private readonly IHttpClientFactory _httpClientFactory;
         private readonly IMediaSourceManager _mediaSourceManager;
-        private readonly ISubtitleParser _subtitleParser;
 
         /// <summary>
         /// The _semaphoreLocks.
@@ -49,16 +48,14 @@ public SubtitleEncoder(
             IFileSystem fileSystem,
             IMediaEncoder mediaEncoder,
             IHttpClientFactory httpClientFactory,
-            IMediaSourceManager mediaSourceManager,
-            ISubtitleParser subtitleParser)
+            IMediaSourceManager mediaSourceManager)
         {
             _logger = logger;
             _appPaths = appPaths;
             _fileSystem = fileSystem;
             _mediaEncoder = mediaEncoder;
             _httpClientFactory = httpClientFactory;
             _mediaSourceManager = mediaSourceManager;
-            _subtitleParser = subtitleParser;
         }
 
         private string SubtitleCachePath => Path.Combine(_appPaths.DataPath, "subtitles");
@@ -76,7 +73,8 @@ private Stream ConvertSubtitles(
 
             try
             {
-                var trackInfo = _subtitleParser.Parse(stream, inputFormat);
+                var reader = GetReader(inputFormat);
+                var trackInfo = reader.Parse(stream, cancellationToken);
 
                 FilterEvents(trackInfo, startTimeTicks, endTimeTicks, preserveOriginalTimestamps);
 
@@ -238,8 +236,7 @@ await ExtractTextSubtitle(mediaSource, subtitleStream, outputCodec, outputPath,
             var currentFormat = (Path.GetExtension(subtitleStream.Path) ?? subtitleStream.Codec)
                 .TrimStart('.');
 
-            // Fallback to ffmpeg conversion
-            if (!_subtitleParser.SupportsFileExtension(currentFormat))
+            if (!TryGetReader(currentFormat, out _))
             {
                 // Convert
                 var outputPath = GetSubtitleCachePath(mediaSource, subtitleStream.Index, ".srt");
@@ -265,6 +262,40 @@ await ExtractTextSubtitle(mediaSource, subtitleStream, outputCodec, outputPath,
             };
         }
 
+        private bool TryGetReader(string format, [NotNullWhen(true)] out ISubtitleParser? value)
+        {
+            if (string.Equals(format, SubtitleFormat.SRT, StringComparison.OrdinalIgnoreCase))
+            {
+                value = new SrtParser(_logger);
+                return true;
+            }
+
+            if (string.Equals(format, SubtitleFormat.SSA, StringComparison.OrdinalIgnoreCase))
+            {
+                value = new SsaParser(_logger);
+                return true;
+            }
+
+            if (string.Equals(format, SubtitleFormat.ASS, StringComparison.OrdinalIgnoreCase))
+            {
+                value = new AssParser(_logger);
+                return true;
+            }
+
+            value = null;
+            return false;
+        }
+
+        private ISubtitleParser GetReader(string format)
+        {
+            if (TryGetReader(format, out var reader))
+            {
+                return reader;
+            }
+
+            throw new ArgumentException("Unsupported format: " + format);
+        }
+
         private bool TryGetWriter(string format, [NotNullWhen(true)] out ISubtitleWriter? value)
         {
             ArgumentException.ThrowIfNullOrEmpty(format);

tests/Jellyfin.MediaEncoding.Tests/Subtitles/AssParserTests.cs

@@ -14,7 +14,7 @@ public void Parse_Valid_Success()
         {
             using (var stream = File.OpenRead("Test Data/example.ass"))
             {
-                var parsed = new SubtitleEditParser(new NullLogger<SubtitleEditParser>()).Parse(stream, "ass");
+                var parsed = new AssParser(new NullLogger<AssParser>()).Parse(stream, CancellationToken.None);
                 Assert.Single(parsed.TrackEvents);
                 var trackEvent = parsed.TrackEvents[0];
 

tests/Jellyfin.MediaEncoding.Tests/Subtitles/SrtParserTests.cs

@@ -14,7 +14,7 @@ public void Parse_Valid_Success()
         {
             using (var stream = File.OpenRead("Test Data/example.srt"))
             {
-                var parsed = new SubtitleEditParser(new NullLogger<SubtitleEditParser>()).Parse(stream, "srt");
+                var parsed = new SrtParser(new NullLogger<SrtParser>()).Parse(stream, CancellationToken.None);
                 Assert.Equal(2, parsed.TrackEvents.Count);
 
                 var trackEvent1 = parsed.TrackEvents[0];
@@ -36,7 +36,7 @@ public void Parse_EmptyNewlineBetweenText_Success()
         {
             using (var stream = File.OpenRead("Test Data/example2.srt"))
             {
-                var parsed = new SubtitleEditParser(new NullLogger<SubtitleEditParser>()).Parse(stream, "srt");
+                var parsed = new SrtParser(new NullLogger<SrtParser>()).Parse(stream, CancellationToken.None);
                 Assert.Equal(2, parsed.TrackEvents.Count);
 
                 var trackEvent1 = parsed.TrackEvents[0];

tests/Jellyfin.MediaEncoding.Tests/Subtitles/SsaParserTests.cs

@@ -12,15 +12,15 @@ namespace Jellyfin.MediaEncoding.Subtitles.Tests
 {
     public class SsaParserTests
     {
-        private readonly SubtitleEditParser _parser = new SubtitleEditParser(new NullLogger<SubtitleEditParser>());
+        private readonly SsaParser _parser = new SsaParser(new NullLogger<AssParser>());
 
         [Theory]
         [MemberData(nameof(Parse_MultipleDialogues_TestData))]
         public void Parse_MultipleDialogues_Success(string ssa, IReadOnlyList<SubtitleTrackEvent> expectedSubtitleTrackEvents)
         {
             using (Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(ssa)))
             {
-                SubtitleTrackInfo subtitleTrackInfo = _parser.Parse(stream, "ssa");
+                SubtitleTrackInfo subtitleTrackInfo = _parser.Parse(stream, CancellationToken.None);
 
                 Assert.Equal(expectedSubtitleTrackEvents.Count, subtitleTrackInfo.TrackEvents.Count);
 
@@ -75,7 +75,7 @@ public void Parse_Valid_Success()
         {
             using (var stream = File.OpenRead("Test Data/example.ssa"))
             {
-                var parsed = _parser.Parse(stream, "ssa");
+                var parsed = _parser.Parse(stream, CancellationToken.None);
                 Assert.Single(parsed.TrackEvents);
                 var trackEvent = parsed.TrackEvents[0];