repo creation with initial code after cloning public repo

2026-02-19 07:36:25 -05:00
commit 460884fea3
2860 changed files with 650825 additions and 0 deletions
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+#nullable disable
+#pragma warning disable CS1591
+
+using System;
+using System.Linq;
+
+namespace MediaBrowser.Model.Dlna
+{
+    public static class ResolutionNormalizer
+    {
+        // Please note: all bitrate here are in the scale of SDR h264 bitrate at 30fps
+        private static readonly ResolutionConfiguration[] _configurations =
+        [
+            new ResolutionConfiguration(416, 365000),
+            new ResolutionConfiguration(640, 730000),
+            new ResolutionConfiguration(768, 1100000),
+            new ResolutionConfiguration(960, 3000000),
+            new ResolutionConfiguration(1280, 6000000),
+            new ResolutionConfiguration(1920, 13500000),
+            new ResolutionConfiguration(2560, 28000000),
+            new ResolutionConfiguration(3840, 50000000)
+        ];
+
+        public static ResolutionOptions Normalize(
+            int? inputBitrate,
+            int outputBitrate,
+            int h264EquivalentOutputBitrate,
+            int? maxWidth,
+            int? maxHeight,
+            float? targetFps,
+            bool isHdr = false) // We are not doing HDR transcoding for now, leave for future use
+        {
+            // If the bitrate isn't changing, then don't downscale the resolution
+            if (inputBitrate.HasValue && outputBitrate >= inputBitrate.Value)
+            {
+                if (maxWidth.HasValue || maxHeight.HasValue)
+                {
+                    return new ResolutionOptions
+                    {
+                        MaxWidth = maxWidth,
+                        MaxHeight = maxHeight
+                    };
+                }
+            }
+
+            // Our reference bitrate is based on SDR h264 at 30fps
+            var referenceFps = targetFps ?? 30.0f;
+            var referenceScale = referenceFps <= 30.0f
+                ? 30.0f / referenceFps
+                : 1.0f / MathF.Sqrt(referenceFps / 30.0f);
+            var referenceBitrate = h264EquivalentOutputBitrate * referenceScale;
+
+            if (isHdr)
+            {
+                referenceBitrate *= 0.8f;
+            }
+
+            var resolutionConfig = GetResolutionConfiguration(Convert.ToInt32(referenceBitrate));
+
+            if (resolutionConfig is null)
+            {
+                return new ResolutionOptions { MaxWidth = maxWidth, MaxHeight = maxHeight };
+            }
+
+            var originWidthValue = maxWidth;
+
+            maxWidth = Math.Min(resolutionConfig.MaxWidth, maxWidth ?? resolutionConfig.MaxWidth);
+            if (!originWidthValue.HasValue || originWidthValue.Value != maxWidth.Value)
+            {
+                maxHeight = null;
+            }
+
+            return new ResolutionOptions
+            {
+                MaxWidth = maxWidth,
+                MaxHeight = maxHeight
+            };
+        }
+
+        private static ResolutionConfiguration GetResolutionConfiguration(int outputBitrate)
+        {
+            return _configurations.FirstOrDefault(config => outputBitrate <= config.MaxBitrate);
+        }
+    }
+}