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				|  |  | -using MediaBrowser.Common.IO;
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				|  |  | -using MediaBrowser.Common.MediaInfo;
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				|  |  | -using MediaBrowser.Common.ScheduledTasks;
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				|  |  | -using MediaBrowser.Controller;
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				|  |  | -using MediaBrowser.Controller.Entities.Audio;
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				|  |  | -using MediaBrowser.Controller.Library;
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				|  |  | -using MediaBrowser.Model.Entities;
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				|  |  | -using System;
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				|  |  | -using System.Collections.Concurrent;
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				|  |  | -using System.Collections.Generic;
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				|  |  | -using System.Linq;
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				|  |  | -using System.Threading;
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				|  |  | -using System.Threading.Tasks;
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				|  |  | -using MediaBrowser.Model.Logging;
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				|  |  | -using MoreLinq;
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				|  |  | -
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				|  |  | -namespace MediaBrowser.Server.Implementations.ScheduledTasks
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				|  |  | -{
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				|  |  | -    /// <summary>
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				|  |  | -    /// Class AudioImagesTask
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				|  |  | -    /// </summary>
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				|  |  | -    public class AudioImagesTask : IScheduledTask
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				|  |  | -    {
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets or sets the image cache.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <value>The image cache.</value>
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				|  |  | -        public FileSystemRepository ImageCache { get; set; }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// The _library manager
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				|  |  | -        /// </summary>
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				|  |  | -        private readonly ILibraryManager _libraryManager;
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				|  |  | -        /// <summary>
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				|  |  | -        /// The _media encoder
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				|  |  | -        /// </summary>
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				|  |  | -        private readonly IMediaEncoder _mediaEncoder;
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				|  |  | -
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				|  |  | -        private readonly ILogger _logger;
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				|  |  | -
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// The _locks
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				|  |  | -        /// </summary>
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				|  |  | -        private readonly ConcurrentDictionary<string, SemaphoreSlim> _locks = new ConcurrentDictionary<string, SemaphoreSlim>();
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				|  |  | -
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				|  |  | -        private readonly List<Audio> _newlyAddedItems = new List<Audio>();
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				|  |  | -
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				|  |  | -        private const int NewItemDelay = 60000;
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// The current new item timer
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				|  |  | -        /// </summary>
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				|  |  | -        /// <value>The new item timer.</value>
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				|  |  | -        private Timer NewItemTimer { get; set; }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Initializes a new instance of the <see cref="AudioImagesTask" /> class.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="libraryManager">The library manager.</param>
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				|  |  | -        /// <param name="mediaEncoder">The media encoder.</param>
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				|  |  | -        public AudioImagesTask(ILibraryManager libraryManager, IMediaEncoder mediaEncoder, ILogManager logManager)
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				|  |  | -        {
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				|  |  | -            _libraryManager = libraryManager;
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				|  |  | -            _mediaEncoder = mediaEncoder;
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				|  |  | -            _logger = logManager.GetLogger(GetType().Name);
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				|  |  | -
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				|  |  | -            ImageCache = new FileSystemRepository(Kernel.Instance.FFMpegManager.AudioImagesDataPath);
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				|  |  | -
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				|  |  | -            libraryManager.ItemAdded += libraryManager_ItemAdded;
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				|  |  | -            libraryManager.ItemUpdated += libraryManager_ItemAdded;
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Handles the ItemAdded event of the libraryManager control.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="sender">The source of the event.</param>
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				|  |  | -        /// <param name="e">The <see cref="ItemChangeEventArgs"/> instance containing the event data.</param>
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				|  |  | -        void libraryManager_ItemAdded(object sender, ItemChangeEventArgs e)
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				|  |  | -        {
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				|  |  | -            var audio = e.Item as Audio;
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				|  |  | -
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				|  |  | -            if (audio != null)
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				|  |  | -            {
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				|  |  | -                lock (_newlyAddedItems)
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				|  |  | -                {
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				|  |  | -                    _newlyAddedItems.Add(audio);
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				|  |  | -
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				|  |  | -                    if (NewItemTimer == null)
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				|  |  | -                    {
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				|  |  | -                        NewItemTimer = new Timer(NewItemTimerCallback, null, NewItemDelay, Timeout.Infinite);
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				|  |  | -                    }
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				|  |  | -                    else
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				|  |  | -                    {
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				|  |  | -                        NewItemTimer.Change(NewItemDelay, Timeout.Infinite);
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				|  |  | -                    }
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				|  |  | -                }
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				|  |  | -            }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// News the item timer callback.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="state">The state.</param>
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				|  |  | -        private async void NewItemTimerCallback(object state)
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				|  |  | -        {
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				|  |  | -            List<Audio> newSongs;
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				|  |  | -
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				|  |  | -            // Lock the list and release all resources
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				|  |  | -            lock (_newlyAddedItems)
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				|  |  | -            {
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				|  |  | -                newSongs = _newlyAddedItems.DistinctBy(i => i.Id).ToList();
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				|  |  | -                _newlyAddedItems.Clear();
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				|  |  | -
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				|  |  | -                NewItemTimer.Dispose();
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				|  |  | -                NewItemTimer = null;
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				|  |  | -            }
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				|  |  | -
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				|  |  | -            foreach (var item in newSongs
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				|  |  | -                .Where(i => i.LocationType == LocationType.FileSystem && string.IsNullOrEmpty(i.PrimaryImagePath) && i.MediaStreams.Any(m => m.Type == MediaStreamType.Video))
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				|  |  | -                .Take(10))
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				|  |  | -            {
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				|  |  | -                try
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				|  |  | -                {
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				|  |  | -                    await CreateImagesForSong(item, CancellationToken.None).ConfigureAwait(false);
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				|  |  | -                }
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				|  |  | -                catch (Exception ex)
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				|  |  | -                {
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				|  |  | -                    _logger.ErrorException("Error creating image for {0}", ex, item.Name);
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				|  |  | -                }
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				|  |  | -            }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets the name of the task
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				|  |  | -        /// </summary>
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				|  |  | -        /// <value>The name.</value>
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				|  |  | -        public string Name
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				|  |  | -        {
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				|  |  | -            get { return "Audio image extraction"; }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets the description.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <value>The description.</value>
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				|  |  | -        public string Description
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				|  |  | -        {
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				|  |  | -            get { return "Extracts images from audio files that do not have external images."; }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets the category.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <value>The category.</value>
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				|  |  | -        public string Category
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				|  |  | -        {
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				|  |  | -            get { return "Library"; }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Executes the task
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="cancellationToken">The cancellation token.</param>
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				|  |  | -        /// <param name="progress">The progress.</param>
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				|  |  | -        /// <returns>Task.</returns>
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				|  |  | -        public async Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
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				|  |  | -        {
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				|  |  | -            var items = _libraryManager.RootFolder.RecursiveChildren
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				|  |  | -                .OfType<Audio>()
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				|  |  | -                .Where(i => i.LocationType == LocationType.FileSystem && string.IsNullOrEmpty(i.PrimaryImagePath) && i.MediaStreams.Any(m => m.Type == MediaStreamType.Video))
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				|  |  | -                .ToList();
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				|  |  | -
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				|  |  | -            progress.Report(0);
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				|  |  | -
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				|  |  | -            var numComplete = 0;
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				|  |  | -
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				|  |  | -            foreach (var item in items)
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				|  |  | -            {
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				|  |  | -                try
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				|  |  | -                {
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				|  |  | -                    await CreateImagesForSong(item, cancellationToken).ConfigureAwait(false);
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				|  |  | -                }
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				|  |  | -                catch
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				|  |  | -                {
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				|  |  | -                    // Already logged at lower levels.
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				|  |  | -                    // Just don't let the task fail
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				|  |  | -                }
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				|  |  | -
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				|  |  | -                numComplete++;
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				|  |  | -                double percent = numComplete;
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				|  |  | -                percent /= items.Count;
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				|  |  | -
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				|  |  | -                progress.Report(100 * percent);
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				|  |  | -            }
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				|  |  | -
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				|  |  | -            progress.Report(100);
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Creates the images for song.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="item">The item.</param>
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				|  |  | -        /// <param name="cancellationToken">The cancellation token.</param>
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				|  |  | -        /// <returns>Task.</returns>
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				|  |  | -        private async Task CreateImagesForSong(Audio item, CancellationToken cancellationToken)
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				|  |  | -        {
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				|  |  | -            cancellationToken.ThrowIfCancellationRequested();
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				|  |  | -
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				|  |  | -            if (item.MediaStreams.All(i => i.Type != MediaStreamType.Video))
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				|  |  | -            {
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				|  |  | -                throw new InvalidOperationException("Can't extract an image unless the audio file has an embedded image.");
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				|  |  | -            }
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				|  |  | -
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				|  |  | -            var album = item.Parent as MusicAlbum;
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				|  |  | -
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				|  |  | -            var filename = item.Album ?? string.Empty;
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				|  |  | -
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				|  |  | -            filename += album == null ? item.Id.ToString("N") + item.DateModified.Ticks : album.Id.ToString("N") + album.DateModified.Ticks;
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				|  |  | -
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				|  |  | -            var path = ImageCache.GetResourcePath(filename + "_primary", ".jpg");
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				|  |  | -
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				|  |  | -            if (!ImageCache.ContainsFilePath(path))
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				|  |  | -            {
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				|  |  | -                var semaphore = GetLock(path);
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				|  |  | -
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				|  |  | -                // Acquire a lock
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				|  |  | -                await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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				|  |  | -
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				|  |  | -                // Check again
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				|  |  | -                if (!ImageCache.ContainsFilePath(path))
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				|  |  | -                {
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				|  |  | -                    try
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				|  |  | -                    {
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				|  |  | -                        await _mediaEncoder.ExtractImage(new[] { item.Path }, InputType.AudioFile, null, path, cancellationToken).ConfigureAwait(false);
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				|  |  | -                    }
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				|  |  | -                    finally
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				|  |  | -                    {
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				|  |  | -                        semaphore.Release();
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				|  |  | -                    }
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				|  |  | -
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				|  |  | -                    // Image is already in the cache
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				|  |  | -                    item.PrimaryImagePath = path;
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				|  |  | -
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				|  |  | -                    await _libraryManager.UpdateItem(item, cancellationToken).ConfigureAwait(false);
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				|  |  | -                }
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				|  |  | -                else
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				|  |  | -                {
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				|  |  | -                    semaphore.Release();
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				|  |  | -                }
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				|  |  | -            }
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets the default triggers.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <returns>IEnumerable{BaseTaskTrigger}.</returns>
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				|  |  | -        public IEnumerable<ITaskTrigger> GetDefaultTriggers()
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				|  |  | -        {
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				|  |  | -            return new ITaskTrigger[]
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				|  |  | -                {
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				|  |  | -                    new DailyTrigger { TimeOfDay = TimeSpan.FromHours(1) }
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				|  |  | -                };
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				|  |  | -        }
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				|  |  | -
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				|  |  | -        /// <summary>
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				|  |  | -        /// Gets the lock.
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				|  |  | -        /// </summary>
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				|  |  | -        /// <param name="filename">The filename.</param>
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				|  |  | -        /// <returns>System.Object.</returns>
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				|  |  | -        private SemaphoreSlim GetLock(string filename)
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				|  |  | -        {
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				|  |  | -            return _locks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
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				|  |  | -        }
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				|  |  | -    }
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				|  |  | -}
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