Updated audio image extraction logic. Added caching classes.

Harmonia.Core/Caching/AudioImageMemoryCache.cs

@@ -0,0 +1,36 @@
+using Harmonia.Core.Imaging;
+using Harmonia.Core.Models;
+
+namespace Harmonia.Core.Caching;
+
+public class AudioImageMemoryCache(IAudioImageExtractor audioImageExtractor) : MemoryCache<Song, SongPictureInfo>, IAudioImageCache
+{
+    protected override object? GetKey(Song key)
+    {
+        if (string.IsNullOrWhiteSpace(key.ImageHash) == false)
+        {
+            return key.ImageHash;
+        }
+        else if (string.IsNullOrWhiteSpace(key.ImageName) == false)
+        {
+            return key.ImageName;
+        }
+
+        return null;
+    }
+
+    protected override SongPictureInfo? Fetch(Song key)
+    {
+        return audioImageExtractor.ExtractImage(key.FileName);
+    }
+
+    protected override void AddToCache(object key, SongPictureInfo entry)
+    {
+        base.AddToCache(key, entry);
+    }
+
+    protected override long GetEntrySize(SongPictureInfo entry)
+    {
+        return entry.Size;
+    }
+}