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using MediaBrowser.Common.ScheduledTasks;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using MoreLinq;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.ScheduledTasks
{
/// <summary>
/// Class ChapterImagesTask
/// </summary>
class ChapterImagesTask : IScheduledTask
{
private readonly IJsonSerializer _jsonSerializer;
/// <summary>
/// The _kernel
/// </summary>
private readonly Kernel _kernel;
/// <summary>
/// The _logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// The _library manager
/// </summary>
private readonly ILibraryManager _libraryManager;
private readonly List<Video> _newlyAddedItems = new List<Video>();
private const int NewItemDelay = 60000;
/// <summary>
/// The current new item timer
/// </summary>
/// <value>The new item timer.</value>
private Timer NewItemTimer { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="ChapterImagesTask" /> class.
/// </summary>
/// <param name="kernel">The kernel.</param>
/// <param name="logManager">The log manager.</param>
/// <param name="libraryManager">The library manager.</param>
/// <param name="jsonSerializer">The json serializer.</param>
public ChapterImagesTask(Kernel kernel, ILogManager logManager, ILibraryManager libraryManager, IJsonSerializer jsonSerializer)
{
_kernel = kernel;
_logger = logManager.GetLogger(GetType().Name);
_libraryManager = libraryManager;
_jsonSerializer = jsonSerializer;
libraryManager.ItemAdded += libraryManager_ItemAdded;
libraryManager.ItemUpdated += libraryManager_ItemAdded;
}
void libraryManager_ItemAdded(object sender, ItemChangeEventArgs e)
{
var video = e.Item as Video;
if (video != null)
{
lock (_newlyAddedItems)
{
_newlyAddedItems.Add(video);
if (NewItemTimer == null)
{
NewItemTimer = new Timer(NewItemTimerCallback, null, NewItemDelay, Timeout.Infinite);
}
else
{
NewItemTimer.Change(NewItemDelay, Timeout.Infinite);
}
}
}
}
private async void NewItemTimerCallback(object state)
{
List<Video> newItems;
// Lock the list and release all resources
lock (_newlyAddedItems)
{
newItems = _newlyAddedItems.DistinctBy(i => i.Id).ToList();
_newlyAddedItems.Clear();
NewItemTimer.Dispose();
NewItemTimer = null;
}
// Limit to video files to reduce changes of ffmpeg crash dialog
foreach (var item in newItems
.Where(i => i.LocationType == LocationType.FileSystem && i.VideoType == VideoType.VideoFile && string.IsNullOrEmpty(i.PrimaryImagePath) && i.MediaStreams.Any(m => m.Type == MediaStreamType.Video))
.Take(1))
{
try
{
await _kernel.FFMpegManager.PopulateChapterImages(item, CancellationToken.None, true, true);
}
catch (Exception ex)
{
_logger.ErrorException("Error creating image for {0}", ex, item.Name);
}
}
}
/// <summary>
/// Creates the triggers that define when the task will run
/// </summary>
/// <returns>IEnumerable{BaseTaskTrigger}.</returns>
public IEnumerable<ITaskTrigger> GetDefaultTriggers()
{
return new ITaskTrigger[]
{
new DailyTrigger { TimeOfDay = TimeSpan.FromHours(4) }
};
}
/// <summary>
/// Returns the task to be executed
/// </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 videos = _libraryManager.RootFolder.RecursiveChildren
.OfType<Video>()
.Where(v => v.Chapters != null && v.Chapters.Count != 0)
.ToList();
var numComplete = 0;
var failHistoryPath = Path.Combine(_kernel.FFMpegManager.VideoImagesDataPath, "failures.json");
List<string> previouslyFailedImages;
try
{
previouslyFailedImages = _jsonSerializer.DeserializeFromFile<List<string>>(failHistoryPath);
}
catch (FileNotFoundException)
{
previouslyFailedImages = new List<string>();
}
foreach (var video in videos)
{
cancellationToken.ThrowIfCancellationRequested();
var key = video.Path + video.DateModified.Ticks;
var extract = !previouslyFailedImages.Contains(key, StringComparer.OrdinalIgnoreCase);
var success = await _kernel.FFMpegManager.PopulateChapterImages(video, cancellationToken, extract, true);
if (!success)
{
previouslyFailedImages.Add(key);
var parentPath = Path.GetDirectoryName(failHistoryPath);
if (!Directory.Exists(parentPath))
{
Directory.CreateDirectory(parentPath);
}
_jsonSerializer.SerializeToFile(previouslyFailedImages, failHistoryPath);
}
numComplete++;
double percent = numComplete;
percent /= videos.Count;
progress.Report(100 * percent);
}
}
/// <summary>
/// Gets the name of the task
/// </summary>
/// <value>The name.</value>
public string Name
{
get { return "Chapter image extraction"; }
}
/// <summary>
/// Gets the description.
/// </summary>
/// <value>The description.</value>
public string Description
{
get { return "Creates thumbnails for videos that have chapters."; }
}
/// <summary>
/// Gets the category.
/// </summary>
/// <value>The category.</value>
public string Category
{
get
{
return "Library";
}
}
}
}
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