Clean up EnumFlags serialization

Jellyfin.Api/Controllers/UniversalAudioController.cs

@@ -224,7 +224,7 @@ namespace Jellyfin.Api.Controllers
                     DeInterlace = false,
                     RequireNonAnamorphic = false,
                     EnableMpegtsM2TsMode = false,
-                    TranscodeReasons = mediaSource.TranscodeReasons == MediaBrowser.Model.Session.TranscodeReason.None ? null : mediaSource.TranscodeReasons.Serialize(),
+                    TranscodeReasons = mediaSource.TranscodeReasons == TranscodeReason.None ? null : mediaSource.TranscodeReasons.ToString(),
                     Context = EncodingContext.Static,
                     StreamOptions = new Dictionary<string, string>(),
                     EnableAdaptiveBitrateStreaming = true
@@ -255,7 +255,7 @@ namespace Jellyfin.Api.Controllers
                 CopyTimestamps = true,
                 StartTimeTicks = startTimeTicks,
                 SubtitleMethod = SubtitleDeliveryMethod.Embed,
-                TranscodeReasons = mediaSource.TranscodeReasons == MediaBrowser.Model.Session.TranscodeReason.None ? null : mediaSource.TranscodeReasons.Serialize(),
+                TranscodeReasons = mediaSource.TranscodeReasons == TranscodeReason.None ? null : mediaSource.TranscodeReasons.ToString(),
                 Context = EncodingContext.Static
             };
 

MediaBrowser.Controller/MediaEncoding/EncodingJobInfo.cs

@@ -35,9 +35,6 @@ namespace MediaBrowser.Controller.MediaEncoding
             SupportedSubtitleCodecs = Array.Empty<string>();
         }
 
-        public TranscodeReason[] TranscodeReasons => TranscodeReason.ToArray();
-
-        [JsonIgnore]
         public TranscodeReason TranscodeReason
         {
             get

MediaBrowser.Model/Dlna/StreamBuilder.cs

@@ -915,13 +915,13 @@ namespace MediaBrowser.Model.Dlna
             }
 
             _logger.LogInformation(
-                "Transcode Result for Profile: {0}, Path: {1}, PlayMethod: {2}, AudioStreamIndex: {3}, SubtitleStreamIndex: {4}, Reasons: {5}",
+                "Transcode Result for Profile: {Profile}, Path: {Path}, PlayMethod: {PlayMethod}, AudioStreamIndex: {AudioStreamIndex}, SubtitleStreamIndex: {SubtitleStreamIndex}, Reasons: {TranscodeReason}",
-                options.Profile.Name ?? "Anonymous Profile",
+                options.Profile?.Name ?? "Anonymous Profile",
                 item.Path ?? "Unknown path",
-                playlistItem.PlayMethod,
+                playlistItem?.PlayMethod,
-                audioStream.Index,
+                audioStream?.Index,
-                playlistItem.SubtitleStreamIndex,
+                playlistItem?.SubtitleStreamIndex,
-                playlistItem.TranscodeReasons);
+                playlistItem?.TranscodeReasons);
         }
 
         private static int GetDefaultAudioBitrate(string audioCodec, int? audioChannels)

MediaBrowser.Model/Dlna/StreamInfo.cs

@@ -798,7 +798,7 @@ namespace MediaBrowser.Model.Dlna
 
             if (!item.IsDirectStream)
             {
-                list.Add(new NameValuePair("TranscodeReasons", item.TranscodeReasons.Serialize()));
+                list.Add(new NameValuePair("TranscodeReasons", item.TranscodeReasons.ToString()));
             }
 
             return list;

MediaBrowser.Model/Session/TranscodeReasonExtensions.cs

@@ -1,34 +0,0 @@
-using System;
-using System.Linq;
-
-namespace MediaBrowser.Model.Session
-{
-    /// <summary>
-    /// Extension methods for serializing TranscodeReason.
-    /// </summary>
-    public static class TranscodeReasonExtensions
-    {
-        private static readonly TranscodeReason[] _values = Enum.GetValues<TranscodeReason>();
-
-        /// <summary>
-        /// Serializes a TranscodeReason into a delimiter-separated string.
-        /// </summary>
-        /// <param name="reasons">The <see cref="TranscodeReason"/> enumeration.</param>
-        /// <param name="sep">The string separator to use. defualt <c>,</c>.</param>
-        /// <returns>string of transcode reasons delimited.</returns>
-        public static string Serialize(this TranscodeReason reasons, string sep = ",")
-        {
-            return string.Join(sep, reasons.ToArray());
-        }
-
-        /// <summary>
-        /// Serializes a TranscodeReason into an array of individual TranscodeReason bits.
-        /// </summary>
-        /// <param name="reasons">The <see cref="TranscodeReason"/> enumeration.</param>
-        /// <returns>Array of <c>TranscodeReason</c>.</returns>
-        public static TranscodeReason[] ToArray(this TranscodeReason reasons)
-        {
-            return _values.Where(r => r != 0 && reasons.HasFlag(r)).ToArray();
-        }
-    }
-}

MediaBrowser.Model/Session/TranscodingInfo.cs

@@ -1,8 +1,6 @@
 #nullable disable
 #pragma warning disable CS1591
 
-using System.Text.Json.Serialization;
-
 namespace MediaBrowser.Model.Session
 {
     public class TranscodingInfo
@@ -31,9 +29,6 @@ namespace MediaBrowser.Model.Session
 
         public HardwareEncodingType? HardwareAccelerationType { get; set; }
 
-        public TranscodeReason[] TranscodeReasons => TranscodeReason.ToArray();
-
-        [JsonIgnore]
         public TranscodeReason TranscodeReason { get; set; }
     }
 }

src/Jellyfin.Extensions/Json/Converters/JsonFlagEnumConverter.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Extensions.Json.Converters;
+
+/// <summary>
+/// Enum flag to json array converter.
+/// </summary>
+/// <typeparam name="T">The type of enum.</typeparam>
+public class JsonFlagEnumConverter<T> : JsonConverter<T>
+    where T : Enum
+{
+    private static readonly T[] _enumValues = (T[])Enum.GetValues(typeof(T));
+
+    /// <inheritdoc />
+    public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+    {
+        throw new NotImplementedException();
+    }
+
+    /// <inheritdoc />
+    public override void Write(Utf8JsonWriter writer, T value, JsonSerializerOptions options)
+    {
+        writer.WriteStartArray();
+        foreach (var enumValue in _enumValues)
+        {
+            if (value.HasFlag(enumValue))
+            {
+                writer.WriteStringValue(enumValue.ToString());
+            }
+        }
+
+        writer.WriteEndArray();
+    }
+}

src/Jellyfin.Extensions/Json/Converters/JsonFlagEnumConverterFactory.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Reflection;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace Jellyfin.Extensions.Json.Converters;
+
+/// <summary>
+/// Json flag enum converter factory.
+/// </summary>
+public class JsonFlagEnumConverterFactory : JsonConverterFactory
+{
+    /// <inheritdoc />
+    public override bool CanConvert(Type typeToConvert)
+    {
+        return typeToConvert.IsEnum && typeToConvert.IsDefined(typeof(FlagsAttribute));
+    }
+
+    /// <inheritdoc />
+    public override JsonConverter? CreateConverter(Type typeToConvert, JsonSerializerOptions options)
+    {
+        return (JsonConverter?)Activator.CreateInstance(typeof(JsonFlagEnumConverter<>).MakeGenericType(typeToConvert));
+    }
+}

src/Jellyfin.Extensions/Json/JsonDefaults.cs

@@ -36,6 +36,7 @@ namespace Jellyfin.Extensions.Json
                 new JsonGuidConverter(),
                 new JsonNullableGuidConverter(),
                 new JsonVersionConverter(),
+                new JsonFlagEnumConverterFactory(),
                 new JsonStringEnumConverter(),
                 new JsonNullableStructConverterFactory(),
                 new JsonBoolNumberConverter(),