repo creation with initial code after cloning public repo

src/Jellyfin.MediaEncoding.Hls/Cache/CacheDecorator.cs

@@ -0,0 +1,61 @@
+#pragma warning disable CA1826 // Do not use Enumerable methods on indexable collections
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Linq;
+using System.Threading;
+using Jellyfin.MediaEncoding.Hls.Extractors;
+using Jellyfin.MediaEncoding.Keyframes;
+using MediaBrowser.Controller.Persistence;
+using Microsoft.Extensions.Logging;
+
+namespace Jellyfin.MediaEncoding.Hls.Cache;
+
+/// <inheritdoc />
+public class CacheDecorator : IKeyframeExtractor
+{
+    private readonly IKeyframeRepository _keyframeRepository;
+    private readonly IKeyframeExtractor _keyframeExtractor;
+    private readonly ILogger<CacheDecorator> _logger;
+    private readonly string _keyframeExtractorName;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="CacheDecorator"/> class.
+    /// </summary>
+    /// <param name="keyframeRepository">An instance of the <see cref="IKeyframeRepository"/> interface.</param>
+    /// <param name="keyframeExtractor">An instance of the <see cref="IKeyframeExtractor"/> interface.</param>
+    /// <param name="logger">An instance of the <see cref="ILogger{CacheDecorator}"/> interface.</param>
+    public CacheDecorator(IKeyframeRepository keyframeRepository, IKeyframeExtractor keyframeExtractor, ILogger<CacheDecorator> logger)
+    {
+        ArgumentNullException.ThrowIfNull(keyframeRepository);
+        ArgumentNullException.ThrowIfNull(keyframeExtractor);
+
+        _keyframeRepository = keyframeRepository;
+        _keyframeExtractor = keyframeExtractor;
+        _logger = logger;
+        _keyframeExtractorName = keyframeExtractor.GetType().Name;
+    }
+
+    /// <inheritdoc />
+    public bool IsMetadataBased => _keyframeExtractor.IsMetadataBased;
+
+    /// <inheritdoc />
+    public bool TryExtractKeyframes(Guid itemId, string filePath, [NotNullWhen(true)] out KeyframeData? keyframeData)
+    {
+        keyframeData = _keyframeRepository.GetKeyframeData(itemId).FirstOrDefault();
+        if (keyframeData is null)
+        {
+            if (!_keyframeExtractor.TryExtractKeyframes(itemId, filePath, out var result))
+            {
+                _logger.LogDebug("Failed to extract keyframes using {ExtractorName}", _keyframeExtractorName);
+                return false;
+            }
+
+            _logger.LogDebug("Successfully extracted keyframes using {ExtractorName}", _keyframeExtractorName);
+            keyframeData = result;
+            _keyframeRepository.SaveKeyframeDataAsync(itemId, keyframeData, CancellationToken.None).GetAwaiter().GetResult();
+        }
+
+        return true;
+    }
+}