Add retroactive scan task for existing libraries

2026-09-17 14:20:14 +02:00
parent bb7af50879
commit 904aada05d
4 changed files with 175 additions and 77 deletions
@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.Linq;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+
+namespace JellyfinPlugin
+{
+    public static class CropHelper
+    {
+        public static async Task<string> DetectCropAsync(string filePath, double limit)
+        {
+            string limitStr = limit.ToString(System.Globalization.CultureInfo.InvariantCulture);
+
+            var startInfo = new ProcessStartInfo
+            {
+                FileName = "ffmpeg", 
+                Arguments = $"-skip_frame nokey -i \"{filePath}\" -vf \"cropdetect=limit={limitStr}:round=16:reset=0\" -f null -",
+                RedirectStandardError = true,
+                RedirectStandardOutput = true,
+                UseShellExecute = false,
+                CreateNoWindow = true
+            };
+
+            using var process = new Process { StartInfo = startInfo };
+            process.Start();
+
+            string output = await process.StandardError.ReadToEndAsync();
+            await process.WaitForExitAsync();
+
+            var regex = new Regex(@"crop=([0-9]+):([0-9]+):([0-9]+):([0-9]+)");
+            var matches = regex.Matches(output);
+            
+            var crops = new ConcurrentDictionary<string, int>();
+            int totalFrames = 0;
+
+            foreach (Match match in matches)
+            {
+                string cropStr = match.Value.Replace("crop=", "");
+                crops.AddOrUpdate(cropStr, 1, (_, count) => count + 1);
+                totalFrames++;
+            }
+
+            if (totalFrames == 0) return string.Empty;
+
+            var validCrops = crops.Where(kvp => (double)kvp.Value / totalFrames > 0.05).ToList();
+            if (!validCrops.Any())
+            {
+                validCrops = crops.OrderByDescending(kvp => kvp.Value).Take(1).ToList();
+            }
+
+            int minX = int.MaxValue, minY = int.MaxValue, maxXW = 0, maxYH = 0;
+
+            foreach (var kvp in validCrops)
+            {
+                var parts = kvp.Key.Split(':');
+                if (parts.Length == 4 && 
+                    int.TryParse(parts[0], out int w) && int.TryParse(parts[1], out int h) &&
+                    int.TryParse(parts[2], out int x) && int.TryParse(parts[3], out int y))
+                {
+                    minX = Math.Min(minX, x);
+                    minY = Math.Min(minY, y);
+                    maxXW = Math.Max(maxXW, x + w);
+                    maxYH = Math.Max(maxYH, y + h);
+                }
+            }
+
+            int finalW = maxXW - minX;
+            int finalH = maxYH - minY;
+
+            if (finalW <= 0 || finalH <= 0) return string.Empty;
+
+            return $"{finalW}:{finalH}:{minX}:{minY}";
+        }
+    }
+}