Add AC4 downmix

Signed-off-by: gnattu <gnattuoc@me.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/MediaBrowser.Model/Entities/DownMixStereoAlgorithms.cs b/MediaBrowser.Model/Entities/DownMixStereoAlgorithms.cs
index be43ef32d..dcb2c802d 100644
--- a/MediaBrowser.Model/Entities/DownMixStereoAlgorithms.cs
+++ b/MediaBrowser.Model/Entities/DownMixStereoAlgorithms.cs
@@ -1,8 +1,7 @@
 namespace MediaBrowser.Model.Entities;
 
 /// <summary>
-/// An enum representing an algorithm to downmix 6ch+ to stereo.
-/// Algorithms sourced from https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg/1410620#1410620.
+/// An enum representing an algorithm to downmix surround sound to stereo.
 /// </summary>
 public enum DownMixStereoAlgorithms
 {
@@ -13,16 +12,24 @@ public enum DownMixStereoAlgorithms
 
     /// <summary>
     /// Algorithm by Dave_750.
+    /// Sourced from https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg/1410620#1410620.
     /// </summary>
     Dave750 = 1,
 
     /// <summary>
     /// Nightmode Dialogue algorithm.
+    /// Sourced from https://superuser.com/questions/852400/properly-downmix-5-1-to-stereo-using-ffmpeg/1410620#1410620.
     /// </summary>
     NightmodeDialogue = 2,
 
     /// <summary>
     /// RFC7845 Section 5.1.1.5 defined algorithm.
     /// </summary>
-    Rfc7845 = 3
+    Rfc7845 = 3,
+
+    /// <summary>
+    /// AC-4 standard algorithm with its default gain values.
+    /// Defined in ETSI TS 103 190 Section 6.2.17
+    /// </summary>
+    Ac4 = 4
 }