Create ILyricsProvider

Jellyfin.Api/Models/UserDtos/ILyricsProvider.cs

@@ -0,0 +1,34 @@
+using System.Collections.ObjectModel;
+using MediaBrowser.Controller.Entities;
+
+namespace Jellyfin.Api.Models.UserDtos
+{
+    /// <summary>
+    /// Interface ILyricsProvider.
+    /// </summary>
+    public interface ILyricsProvider
+    {
+        /// <summary>
+        /// Gets a value indicating the File Extenstions this provider works with.
+        /// </summary>
+        public Collection<string>? FileExtensions { get; }
+
+        /// <summary>
+        /// Gets a value indicating whether Process() generated data.
+        /// </summary>
+        /// <returns><c>true</c> if data generated; otherwise, <c>false</c>.</returns>
+        bool HasData { get; }
+
+        /// <summary>
+        /// Gets Data object generated by Process() method.
+        /// </summary>
+        /// <returns><c>Object</c> with data if no error occured; otherwise, <c>null</c>.</returns>
+        object? Data { get; }
+
+        /// <summary>
+        /// Opens lyric file for [the specified item], and processes it for API return.
+        /// </summary>
+        /// <param name="item">The item to to process.</param>
+        void Process(BaseItem item);
+    }
+}