Add base64 converter for chapter name in mediainfo

Shoko.Server/Utilities/MediaInfoLib/MediaInfo.cs

@@ -46,7 +46,8 @@ private static MediaContainer GetMediaInfo_New(string filename)
                     Converters = new JsonConverter[]
                     {
                         new StreamJsonConverter(), new BooleanConverter(), new StringEnumConverter(),
-                        new DateTimeConverter {DateTimeFormat = "yyyy-MM-dd HH:mm:ss"}, new MultiIntConverter()
+                        new DateTimeConverter {DateTimeFormat = "yyyy-MM-dd HH:mm:ss"}, new MultiIntConverter(),
+                        new MenuBase64Converter()
                     },
                     Error = (_, e) =>
                     {

Shoko.Server/Utilities/MediaInfoLib/MenuBase64Converter.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Shoko.Server.Utilities.MediaInfoLib
+{
+    public class MenuBase64Converter : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType.IsAssignableFrom(typeof(Dictionary<string,string>));
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            if (reader.TokenType == JsonToken.Null)
+                return null;
+
+            var obj = JObject.Load(reader);
+
+            if (reader.Path != "extra") return obj.ToObject<Dictionary<string, string>>(); // Only continue if we are changing "extra" object in menu stream. Otherwise return as is.
+
+            var sanitizedDictionary = new Dictionary<string, string>();
+
+            foreach (var (key, value) in obj)
+            {
+                switch (value?.Type)
+                {
+                    case JTokenType.String:
+                        sanitizedDictionary[key] = value?.ToString();
+                        break;
+                    case JTokenType.Object:
+                    {
+                        var base64EncodedBytes = Convert.FromBase64String(value?["#value"]?.ToString() ?? "");
+                        sanitizedDictionary[key] = Encoding.UTF8.GetString(base64EncodedBytes).Trim();
+                        break;
+                    }
+                    default:
+                        throw new NotImplementedException();
+                }
+            }
+
+            return sanitizedDictionary;
+        }
+
+        public override bool CanWrite => false;
+
+        public override bool CanRead => true;
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}