From 2b7f64116309c7a33611334c1d08745c6c50d537 Mon Sep 17 00:00:00 2001
From: TheMelmacian <76712303+TheMelmacian@users.noreply.github.com>
Date: Sun, 10 May 2026 11:10:56 +0200
Subject: feat: language filters for subtitles and audio

---
 .../DescendantQueryHelper.cs                       |  4 +++-
 .../MatchCriteria/HasMediaStreamType.cs            | 23 +++++++++++++++++++---
 2 files changed, 23 insertions(+), 4 deletions(-)

(limited to 'src/Jellyfin.Database/Jellyfin.Database.Implementations')

diff --git a/src/Jellyfin.Database/Jellyfin.Database.Implementations/DescendantQueryHelper.cs b/src/Jellyfin.Database/Jellyfin.Database.Implementations/DescendantQueryHelper.cs
index 43e6a8bc00..88a2c684ff 100644
--- a/src/Jellyfin.Database/Jellyfin.Database.Implementations/DescendantQueryHelper.cs
+++ b/src/Jellyfin.Database/Jellyfin.Database.Implementations/DescendantQueryHelper.cs
@@ -111,7 +111,9 @@ public static class DescendantQueryHelper
     private static HashSet<Guid> GetMatchingMediaStreamItemIds(JellyfinDbContext context, HasMediaStreamType criteria)
     {
         var query = context.MediaStreamInfos
-            .Where(ms => ms.StreamType == criteria.StreamType && ms.Language == criteria.Language);
+            .Where(ms => ms.StreamType == criteria.StreamType
+                   && (criteria.Language.Contains(ms.Language)
+                       || (criteria.Language.Contains("und") && string.IsNullOrEmpty(ms.Language)))); // und = undetermined
 
         if (criteria.IsExternal.HasValue)
         {
diff --git a/src/Jellyfin.Database/Jellyfin.Database.Implementations/MatchCriteria/HasMediaStreamType.cs b/src/Jellyfin.Database/Jellyfin.Database.Implementations/MatchCriteria/HasMediaStreamType.cs
index 68f2ca2786..c1f6ab16a9 100644
--- a/src/Jellyfin.Database/Jellyfin.Database.Implementations/MatchCriteria/HasMediaStreamType.cs
+++ b/src/Jellyfin.Database/Jellyfin.Database.Implementations/MatchCriteria/HasMediaStreamType.cs
@@ -1,3 +1,6 @@
+#pragma warning disable SA1313 // Parameter names should begin with lower-case letter
+
+using System.Collections.Generic;
 using Jellyfin.Database.Implementations.Entities;
 
 namespace Jellyfin.Database.Implementations.MatchCriteria;
@@ -6,9 +9,23 @@ namespace Jellyfin.Database.Implementations.MatchCriteria;
 /// Matches folders containing descendants with a specific media stream type and language.
 /// </summary>
 /// <param name="StreamType">The type of media stream to match (Audio, Subtitle, etc.).</param>
-/// <param name="Language">The language to match.</param>
+/// <param name="Language">List of languages to match.</param>
 /// <param name="IsExternal">If not null, filters by internal (false) or external (true) streams. Only applicable to subtitles.</param>
 public sealed record HasMediaStreamType(
     MediaStreamTypeEntity StreamType,
-    string Language,
-    bool? IsExternal = null) : FolderMatchCriteria;
+    IReadOnlyCollection<string> Language,
+    bool? IsExternal = null) : FolderMatchCriteria
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="HasMediaStreamType"/> class.
+    /// </summary>
+    /// <param name="StreamType">The type of media stream to match (Audio, Subtitle, etc.).</param>
+    /// <param name="Language">The language to match.</param>
+    /// <param name="IsExternal">If not null, filters by internal (false) or external (true) streams. Only applicable to subtitles.</param>
+    public HasMediaStreamType(
+        MediaStreamTypeEntity StreamType,
+        string Language,
+        bool? IsExternal = null) : this(StreamType, [Language], IsExternal)
+    {
+    }
+}
-- 
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