jellyfin/MediaBrowser.Providers/Music/AudioMetadataService.cs

using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Providers.Manager;
using System.Collections.Generic;

namespace MediaBrowser.Providers.Music
{
    public class AudioMetadataService : MetadataService<Audio, SongInfo>
    {
        private readonly ILibraryManager _libraryManager;

        public AudioMetadataService(IServerConfigurationManager serverConfigurationManager, ILogger logger, IProviderManager providerManager, IProviderRepository providerRepo, IFileSystem fileSystem, ILibraryManager libraryManager)
            : base(serverConfigurationManager, logger, providerManager, providerRepo, fileSystem)
        {
            _libraryManager = libraryManager;
        }

        /// <summary>
        /// Merges the specified source.
        /// </summary>
        /// <param name="source">The source.</param>
        /// <param name="target">The target.</param>
        /// <param name="lockedFields">The locked fields.</param>
        /// <param name="replaceData">if set to <c>true</c> [replace data].</param>
        /// <param name="mergeMetadataSettings">if set to <c>true</c> [merge metadata settings].</param>
        protected override void MergeData(Audio source, Audio target, List<MetadataFields> lockedFields, bool replaceData, bool mergeMetadataSettings)
        {
            ProviderUtils.MergeBaseItemData(source, target, lockedFields, replaceData, mergeMetadataSettings);

            if (replaceData || target.Artists.Count == 0)
            {
                target.Artists = source.Artists;
            }

            if (replaceData || string.IsNullOrEmpty(target.Album))
            {
                target.Album = source.Album;
            }
        }
    }
}