From 6ffa9539bbfbfb1090b02cebc8a28283a8c69041 Mon Sep 17 00:00:00 2001
From: cvium <clausvium@gmail.com>
Date: Tue, 11 Jan 2022 23:30:30 +0100
Subject: Refactor and add scheduled task

---
 .../Matroska/MatroskaKeyframeExtractor.cs          | 101 ++++++++++-----------
 1 file changed, 50 insertions(+), 51 deletions(-)

(limited to 'src/Jellyfin.MediaEncoding.Keyframes/Matroska/MatroskaKeyframeExtractor.cs')

diff --git a/src/Jellyfin.MediaEncoding.Keyframes/Matroska/MatroskaKeyframeExtractor.cs b/src/Jellyfin.MediaEncoding.Keyframes/Matroska/MatroskaKeyframeExtractor.cs
index 6a8a55643..8bb1ff00d 100644
--- a/src/Jellyfin.MediaEncoding.Keyframes/Matroska/MatroskaKeyframeExtractor.cs
+++ b/src/Jellyfin.MediaEncoding.Keyframes/Matroska/MatroskaKeyframeExtractor.cs
@@ -4,73 +4,72 @@ using System.IO;
 using Jellyfin.MediaEncoding.Keyframes.Matroska.Extensions;
 using NEbml.Core;
 
-namespace Jellyfin.MediaEncoding.Keyframes.Matroska
+namespace Jellyfin.MediaEncoding.Keyframes.Matroska;
+
+/// <summary>
+/// The keyframe extractor for the matroska container.
+/// </summary>
+public static class MatroskaKeyframeExtractor
 {
     /// <summary>
-    /// The keyframe extractor for the matroska container.
+    /// Extracts the keyframes in ticks (scaled using the container timestamp scale) from the matroska container.
     /// </summary>
-    public static class MatroskaKeyframeExtractor
+    /// <param name="filePath">The file path.</param>
+    /// <returns>An instance of <see cref="KeyframeData"/>.</returns>
+    public static KeyframeData GetKeyframeData(string filePath)
     {
-        /// <summary>
-        /// Extracts the keyframes in ticks (scaled using the container timestamp scale) from the matroska container.
-        /// </summary>
-        /// <param name="filePath">The file path.</param>
-        /// <returns>An instance of <see cref="KeyframeData"/>.</returns>
-        public static KeyframeData GetKeyframeData(string filePath)
-        {
-            using var stream = File.OpenRead(filePath);
-            using var reader = new EbmlReader(stream);
+        using var stream = File.OpenRead(filePath);
+        using var reader = new EbmlReader(stream);
+
+        var seekHead = reader.ReadSeekHead();
+        var info = reader.ReadInfo(seekHead.InfoPosition);
+        var videoTrackNumber = reader.FindFirstTrackNumberByType(seekHead.TracksPosition, MatroskaConstants.TrackTypeVideo);
 
-            var seekHead = reader.ReadSeekHead();
-            var info = reader.ReadInfo(seekHead.InfoPosition);
-            var videoTrackNumber = reader.FindFirstTrackNumberByType(seekHead.TracksPosition, MatroskaConstants.TrackTypeVideo);
+        var keyframes = new List<long>();
+        reader.ReadAt(seekHead.CuesPosition);
+        reader.EnterContainer();
 
-            var keyframes = new List<long>();
-            reader.ReadAt(seekHead.CuesPosition);
+        while (reader.FindElement(MatroskaConstants.CuePoint))
+        {
             reader.EnterContainer();
+            ulong? trackNumber = null;
+            // Mandatory element
+            reader.FindElement(MatroskaConstants.CueTime);
+            var cueTime = reader.ReadUInt();
 
-            while (reader.FindElement(MatroskaConstants.CuePoint))
+            // Mandatory element
+            reader.FindElement(MatroskaConstants.CueTrackPositions);
+            reader.EnterContainer();
+            if (reader.FindElement(MatroskaConstants.CuePointTrackNumber))
             {
-                reader.EnterContainer();
-                ulong? trackNumber = null;
-                // Mandatory element
-                reader.FindElement(MatroskaConstants.CueTime);
-                var cueTime = reader.ReadUInt();
-
-                // Mandatory element
-                reader.FindElement(MatroskaConstants.CueTrackPositions);
-                reader.EnterContainer();
-                if (reader.FindElement(MatroskaConstants.CuePointTrackNumber))
-                {
-                    trackNumber = reader.ReadUInt();
-                }
-
-                reader.LeaveContainer();
+                trackNumber = reader.ReadUInt();
+            }
 
-                if (trackNumber == videoTrackNumber)
-                {
-                    keyframes.Add(ScaleToTicks(cueTime, info.TimestampScale));
-                }
+            reader.LeaveContainer();
 
-                reader.LeaveContainer();
+            if (trackNumber == videoTrackNumber)
+            {
+                keyframes.Add(ScaleToTicks(cueTime, info.TimestampScale));
             }
 
             reader.LeaveContainer();
-
-            var result = new KeyframeData(ScaleToTicks(info.Duration ?? 0, info.TimestampScale), keyframes);
-            return result;
         }
 
-        private static long ScaleToTicks(ulong unscaledValue, long timestampScale)
-        {
-            // TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
-            return (long)unscaledValue * timestampScale / 100;
-        }
+        reader.LeaveContainer();
 
-        private static long ScaleToTicks(double unscaledValue, long timestampScale)
-        {
-            // TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
-            return Convert.ToInt64(unscaledValue * timestampScale / 100);
-        }
+        var result = new KeyframeData(ScaleToTicks(info.Duration ?? 0, info.TimestampScale), keyframes);
+        return result;
+    }
+
+    private static long ScaleToTicks(ulong unscaledValue, long timestampScale)
+    {
+        // TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
+        return (long)unscaledValue * timestampScale / 100;
+    }
+
+    private static long ScaleToTicks(double unscaledValue, long timestampScale)
+    {
+        // TimestampScale is in nanoseconds, scale it to get the value in ticks, 1 tick == 100 ns
+        return Convert.ToInt64(unscaledValue * timestampScale / 100);
     }
 }
-- 
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