1 files changed, 63 insertions, 0 deletions
diff --git a/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs b/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs
new file mode 100644
index 000000000..a95de8d39
--- /dev/null
+++ b/MediaBrowser.Model/Dlna/ResolutionNormalizer.cs
@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Model.Dlna
+{
+    public class ResolutionNormalizer
+    {
+        private static readonly List<ResolutionConfiguration> Configurations = 
+            new List<ResolutionConfiguration>
+            {
+                new ResolutionConfiguration(426, 320000),
+                new ResolutionConfiguration(640, 400000),
+                new ResolutionConfiguration(720, 950000),
+                new ResolutionConfiguration(1280, 2500000)
+            };
+
+        public static ResolutionOptions Normalize(int maxBitrate,
+            string codec,
+            int? maxWidth,
+            int? maxHeight)
+        {
+            foreach (var config in Configurations)
+            {
+                if (maxBitrate <= config.MaxBitrate)
+                {
+                    var originvalValue = maxWidth;
+
+                    maxWidth = Math.Min(config.MaxWidth, maxWidth ?? config.MaxWidth);
+                    if (!originvalValue.HasValue || originvalValue.Value != maxWidth.Value)
+                    {
+                        maxHeight = null;
+                    }
+
+                    break;
+                }
+            }
+
+            return new ResolutionOptions
+            {
+                MaxWidth = maxWidth,
+                MaxHeight = maxHeight
+            };
+        }
+    }
+
+    public class ResolutionConfiguration
+    {
+        public int MaxWidth { get; set; }
+        public int MaxBitrate { get; set; }
+
+        public ResolutionConfiguration(int maxWidth, int maxBitrate)
+        {
+            MaxWidth = maxWidth;
+            MaxBitrate = maxBitrate;
+        }
+    }
+
+    public class ResolutionOptions
+    {
+        public int? MaxWidth { get; set; }
+        public int? MaxHeight { get; set; }
+    }
+}