WIP: 扫描扫描指定目录内的所有音频文件，获取其meta信息，并将其添加至一个名为default的数据库。

src/Core/AudioFileScanner.cs

@@ -0,0 +1,49 @@
+namespace OCES.Resonance.Core;
+
+/// <summary>
+/// 音频文件扫描器，负责递归扫描目录并识别音频文件
+/// </summary>
+public class AudioFileScanner
+{
+    private static readonly string[] SupportedExtensions = 
+    { 
+        ".wav", ".mp3", ".flac", ".aiff", ".aif", ".m4a", ".ogg", ".wma", ".bwf", ".wav64" 
+    };
+
+    /// <summary>
+    /// 扫描指定目录，返回所有音频文件路径
+    /// </summary>
+    /// <param name="directoryPath">要扫描的目录路径</param>
+    /// <param name="recursive">是否递归扫描子目录</param>
+    /// <returns>音频文件路径集合</returns>
+    public IEnumerable<string> ScanDirectory(string directoryPath, bool recursive = true)
+    {
+        if (!Directory.Exists(directoryPath))
+        {
+            throw new DirectoryNotFoundException($"目录不存在：{directoryPath}");
+        }
+
+        var searchOption = recursive ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly;
+        
+        return SupportedExtensions
+            .SelectMany(ext => Directory.EnumerateFiles(directoryPath, $"*{ext}", searchOption))
+            .Where(IsSupportedAudioFile)
+            .Distinct(StringComparer.OrdinalIgnoreCase);
+    }
+
+    /// <summary>
+    /// 判断文件是否为支持的音频格式
+    /// </summary>
+    /// <param name="filePath">文件路径</param>
+    /// <returns>是否为支持的音频格式</returns>
+    public bool IsSupportedAudioFile(string filePath)
+    {
+        if (string.IsNullOrWhiteSpace(filePath))
+        {
+            return false;
+        }
+
+        var extension = Path.GetExtension(filePath).ToLowerInvariant();
+        return SupportedExtensions.Contains(extension);
+    }
+}