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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Jellyfin.Data.Enums;
using Jellyfin.MediaEncoding.Hls.Extractors;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Globalization;
using MediaBrowser.Model.Tasks;
namespace Jellyfin.MediaEncoding.Hls.ScheduledTasks;
/// <inheritdoc />
public class KeyframeExtractionScheduledTask : IScheduledTask
{
private const int Pagesize = 1000;
private readonly ILocalizationManager _localizationManager;
private readonly ILibraryManager _libraryManager;
private readonly IKeyframeExtractor[] _keyframeExtractors;
private static readonly BaseItemKind[] _itemTypes = { BaseItemKind.Episode, BaseItemKind.Movie };
/// <summary>
/// Initializes a new instance of the <see cref="KeyframeExtractionScheduledTask"/> class.
/// </summary>
/// <param name="localizationManager">An instance of the <see cref="ILocalizationManager"/> interface.</param>
/// <param name="libraryManager">An instance of the <see cref="ILibraryManager"/> interface.</param>
/// <param name="keyframeExtractors">The keyframe extractors.</param>
public KeyframeExtractionScheduledTask(ILocalizationManager localizationManager, ILibraryManager libraryManager, IEnumerable<IKeyframeExtractor> keyframeExtractors)
{
_localizationManager = localizationManager;
_libraryManager = libraryManager;
_keyframeExtractors = keyframeExtractors.OrderByDescending(e => e.IsMetadataBased).ToArray();
}
/// <inheritdoc />
public string Name => "Keyframe Extractor";
/// <inheritdoc />
public string Key => "KeyframeExtraction";
/// <inheritdoc />
public string Description => "Extracts keyframes from video files to create more precise HLS playlists. This task may run for a long time.";
/// <inheritdoc />
public string Category => _localizationManager.GetLocalizedString("TasksLibraryCategory");
/// <inheritdoc />
public Task ExecuteAsync(IProgress<double> progress, CancellationToken cancellationToken)
{
var query = new InternalItemsQuery
{
MediaTypes = new[] { MediaType.Video },
IsVirtualItem = false,
IncludeItemTypes = _itemTypes,
DtoOptions = new DtoOptions(true),
SourceTypes = new[] { SourceType.Library },
Recursive = true,
Limit = Pagesize
};
var numberOfVideos = _libraryManager.GetCount(query);
var startIndex = 0;
var numComplete = 0;
while (startIndex < numberOfVideos)
{
query.StartIndex = startIndex;
var videos = _libraryManager.GetItemList(query);
var currentPageCount = videos.Count;
// TODO parallelize with Parallel.ForEach?
for (var i = 0; i < currentPageCount; i++)
{
var video = videos[i];
// Only local files supported
if (video.IsFileProtocol && File.Exists(video.Path))
{
for (var j = 0; j < _keyframeExtractors.Length; j++)
{
var extractor = _keyframeExtractors[j];
// The cache decorator will make sure to save them in the data dir
if (extractor.TryExtractKeyframes(video.Path, out _))
{
break;
}
}
}
// Update progress
numComplete++;
double percent = (double)numComplete / numberOfVideos;
progress.Report(100 * percent);
}
startIndex += Pagesize;
}
progress.Report(100);
return Task.CompletedTask;
}
/// <inheritdoc />
public IEnumerable<TaskTriggerInfo> GetDefaultTriggers() => Enumerable.Empty<TaskTriggerInfo>();
}
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