made library scan a bit more conservative

MediaBrowser.Controller/Providers/MediaInfo/AudioImageProvider.cs

@@ -0,0 +1,101 @@
+using MediaBrowser.Controller.Configuration;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Logging;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Controller.Providers.MediaInfo
+{
+    /// <summary>
+    /// Uses ffmpeg to create video images
+    /// </summary>
+    public class AudioImageProvider : BaseMetadataProvider
+    {
+        /// <summary>
+        /// Initializes a new instance of the <see cref="BaseMetadataProvider" /> class.
+        /// </summary>
+        /// <param name="logManager">The log manager.</param>
+        /// <param name="configurationManager">The configuration manager.</param>
+        public AudioImageProvider(ILogManager logManager, IServerConfigurationManager configurationManager)
+            : base(logManager, configurationManager)
+        {
+        }
+
+        /// <summary>
+        /// The true task result
+        /// </summary>
+        protected static readonly Task<bool> TrueTaskResult = Task.FromResult(true);
+
+        /// <summary>
+        /// Supportses the specified item.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
+        public override bool Supports(BaseItem item)
+        {
+            return item.LocationType == LocationType.FileSystem && item is Audio;
+        }
+
+        /// <summary>
+        /// Override this to return the date that should be compared to the last refresh date
+        /// to determine if this provider should be re-fetched.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <returns>DateTime.</returns>
+        protected override DateTime CompareDate(BaseItem item)
+        {
+            return item.DateModified;
+        }
+
+        /// <summary>
+        /// Gets the priority.
+        /// </summary>
+        /// <value>The priority.</value>
+        public override MetadataProviderPriority Priority
+        {
+            get { return MetadataProviderPriority.Last; }
+        }
+
+        /// <summary>
+        /// Needses the refresh internal.
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="providerInfo">The provider info.</param>
+        /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
+        protected override bool NeedsRefreshInternal(BaseItem item, BaseProviderInfo providerInfo)
+        {
+            if (!string.IsNullOrEmpty(item.PrimaryImagePath))
+            {
+                return false;
+            }
+            return base.NeedsRefreshInternal(item, providerInfo);
+        }
+
+        /// <summary>
+        /// Fetches metadata and returns true or false indicating if any work that requires persistence was done
+        /// </summary>
+        /// <param name="item">The item.</param>
+        /// <param name="force">if set to <c>true</c> [force].</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task{System.Boolean}.</returns>
+        public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
+        {
+            if (force || string.IsNullOrEmpty(item.PrimaryImagePath))
+            {
+                var album = item.ResolveArgs.Parent as MusicAlbum;
+
+                if (album != null)
+                {
+                    // First try to use the parent's image
+                    item.PrimaryImagePath = item.ResolveArgs.Parent.PrimaryImagePath;
+                }
+            }
+
+            SetLastRefreshed(item, DateTime.UtcNow);
+            return TrueTaskResult;
+        }
+    }
+}