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using MediaBrowser.Common.IO;
using MediaBrowser.Common.MediaInfo;
using MediaBrowser.Common.ScheduledTasks;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Entities;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.ScheduledTasks
{
/// <summary>
/// Class AudioImagesTask
/// </summary>
public class AudioImagesTask : IScheduledTask
{
/// <summary>
/// Gets or sets the image cache.
/// </summary>
/// <value>The image cache.</value>
public FileSystemRepository ImageCache { get; set; }
/// <summary>
/// The _library manager
/// </summary>
private readonly ILibraryManager _libraryManager;
/// <summary>
/// The _media encoder
/// </summary>
private readonly IMediaEncoder _mediaEncoder;
/// <summary>
/// The _locks
/// </summary>
private readonly ConcurrentDictionary<string, SemaphoreSlim> _locks = new ConcurrentDictionary<string, SemaphoreSlim>();
/// <summary>
/// Initializes a new instance of the <see cref="AudioImagesTask" /> class.
/// </summary>
/// <param name="libraryManager">The library manager.</param>
/// <param name="mediaEncoder">The media encoder.</param>
public AudioImagesTask(ILibraryManager libraryManager, IMediaEncoder mediaEncoder)
{
_libraryManager = libraryManager;
_mediaEncoder = mediaEncoder;
ImageCache = new FileSystemRepository(Kernel.Instance.FFMpegManager.AudioImagesDataPath);
}
/// <summary>
/// Gets the name of the task
/// </summary>
/// <value>The name.</value>
public string Name
{
get { return "Audio image extraction"; }
}
/// <summary>
/// Gets the description.
/// </summary>
/// <value>The description.</value>
public string Description
{
get { return "Extracts images from audio files that do not have external images."; }
}
/// <summary>
/// Gets the category.
/// </summary>
/// <value>The category.</value>
public string Category
{
get { return "Library"; }
}
/// <summary>
/// Executes the task
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <param name="progress">The progress.</param>
/// <returns>Task.</returns>
public async Task Execute(CancellationToken cancellationToken, IProgress<double> progress)
{
var items = _libraryManager.RootFolder.RecursiveChildren
.OfType<Audio>()
.Where(i => i.LocationType == LocationType.FileSystem && string.IsNullOrEmpty(i.PrimaryImagePath) && i.MediaStreams != null && i.MediaStreams.Any(m => m.Type == MediaStreamType.Video))
.ToList();
progress.Report(0);
var numComplete = 0;
foreach (var item in items)
{
cancellationToken.ThrowIfCancellationRequested();
var album = item.Parent as MusicAlbum;
var filename = item.Album ?? string.Empty;
filename += album == null ? item.Id.ToString() + item.DateModified.Ticks : album.Id.ToString() + album.DateModified.Ticks;
var path = ImageCache.GetResourcePath(filename + "_primary", ".jpg");
var success = true;
if (!ImageCache.ContainsFilePath(path))
{
var semaphore = GetLock(path);
// Acquire a lock
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
// Check again
if (!ImageCache.ContainsFilePath(path))
{
try
{
await _mediaEncoder.ExtractImage(new[] { item.Path }, InputType.AudioFile, null, path, cancellationToken).ConfigureAwait(false);
}
catch
{
success = false;
}
finally
{
semaphore.Release();
}
}
else
{
semaphore.Release();
}
}
numComplete++;
double percent = numComplete;
percent /= items.Count;
progress.Report(100 * percent);
if (success)
{
// Image is already in the cache
item.PrimaryImagePath = path;
await _libraryManager.SaveItem(item, cancellationToken).ConfigureAwait(false);
}
}
progress.Report(100);
}
/// <summary>
/// Gets the default triggers.
/// </summary>
/// <returns>IEnumerable{BaseTaskTrigger}.</returns>
public IEnumerable<ITaskTrigger> GetDefaultTriggers()
{
return new ITaskTrigger[]
{
new DailyTrigger { TimeOfDay = TimeSpan.FromHours(1) }
};
}
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>System.Object.</returns>
private SemaphoreSlim GetLock(string filename)
{
return _locks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
}
}
}
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