Added WinUI project.

Harmonia.WinUI/Caching/AudioBitmapImageCache.cs

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+using Harmonia.Core.Caching;
+using Harmonia.Core.Imaging;
+using Harmonia.Core.Models;
+using Microsoft.Extensions.Caching.Memory;
+using Microsoft.UI.Xaml.Media.Imaging;
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Harmonia.WinUI.Caching;
+
+public class AudioBitmapImageCache(IAudioImageExtractor audioImageExtractor) : MemoryCache<Song, BitmapImage>, IAudioBitmapImageCache
+{
+    protected virtual int MaxImageWidthOrHeight => 1000;
+
+    protected override MemoryCacheOptions Options => new()
+    {
+        SizeLimit = 40,
+        CompactionPercentage = 0.2,
+    };
+
+    protected override TimeSpan SlidingExpiration => TimeSpan.FromSeconds(600);
+
+    protected override int MaxConcurrentRequests => 8;
+
+    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 async ValueTask<BitmapImage?> FetchAsync(Song key, CancellationToken cancellationToken)
+    {
+        SongPictureInfo? songPictureInfo = await audioImageExtractor.ExtractImageAsync(key.FileName, cancellationToken);
+
+        if (songPictureInfo == null)
+            return null;
+
+        using MemoryStream stream = new(songPictureInfo.Data);
+
+        BitmapImage bitmapImage = new();
+
+        await bitmapImage.SetSourceAsync(stream.AsRandomAccessStream());
+
+        bitmapImage.DecodePixelWidth = GetDecodePixelWidth(bitmapImage);
+        bitmapImage.DecodePixelHeight = GetDecodePixelHeight(bitmapImage);
+
+        return bitmapImage;
+    }
+
+    private int GetDecodePixelWidth(BitmapImage bitmapImage)
+    {
+        int originalImageWidth = bitmapImage.PixelWidth;
+        int orignalImageHeight = bitmapImage.PixelHeight;
+
+        if (originalImageWidth <= MaxImageWidthOrHeight && orignalImageHeight <= MaxImageWidthOrHeight)
+            return 0;
+
+        if (orignalImageHeight > originalImageWidth)
+            return 0;
+
+        return MaxImageWidthOrHeight;
+    }
+
+    private int GetDecodePixelHeight(BitmapImage bitmapImage)
+    {
+        int originalImageWidth = bitmapImage.PixelWidth;
+        int orignalImageHeight = bitmapImage.PixelHeight;
+
+        if (originalImageWidth <= MaxImageWidthOrHeight && orignalImageHeight <= MaxImageWidthOrHeight)
+            return 0;
+
+        if (originalImageWidth > orignalImageHeight)
+            return 0;
+
+        return MaxImageWidthOrHeight;
+    }
+
+    protected override long GetEntrySize(BitmapImage entry)
+    {
+        return entry.PixelWidth * entry.PixelHeight;
+    }
+}

Harmonia.WinUI/Caching/IAudioBitmapImageCache.cs

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+using Harmonia.Core.Caching;
+using Harmonia.Core.Models;
+using Microsoft.UI.Xaml.Media.Imaging;
+
+namespace Harmonia.WinUI.Caching;
+
+public interface IAudioBitmapImageCache : ICache<Song, BitmapImage>
+{
+
+}