jellyfin-server/MediaBrowser.Providers/MediaInfo/AudioImageProvider.cs

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C#
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using System;
using MediaBrowser.Common.Extensions;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
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using CommonIO;
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namespace MediaBrowser.Providers.MediaInfo
{
/// <summary>
/// Uses ffmpeg to create video images
/// </summary>
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public class AudioImageProvider : IDynamicImageProvider, IHasItemChangeMonitor
{
private readonly ConcurrentDictionary<string, SemaphoreSlim> _locks = new ConcurrentDictionary<string, SemaphoreSlim>();
private readonly IMediaEncoder _mediaEncoder;
private readonly IServerConfigurationManager _config;
private readonly IFileSystem _fileSystem;
public AudioImageProvider(IMediaEncoder mediaEncoder, IServerConfigurationManager config, IFileSystem fileSystem)
{
_mediaEncoder = mediaEncoder;
_config = config;
_fileSystem = fileSystem;
}
public IEnumerable<ImageType> GetSupportedImages(IHasImages item)
{
return new List<ImageType> { ImageType.Primary };
}
public Task<DynamicImageResponse> GetImage(IHasImages item, ImageType type, CancellationToken cancellationToken)
{
var audio = (Audio)item;
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var imageStreams =
audio.GetMediaSources(false)
.Take(1)
.SelectMany(i => i.MediaStreams)
.Where(i => i.Type == MediaStreamType.EmbeddedImage)
.ToList();
// Can't extract if we didn't find a video stream in the file
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if (imageStreams.Count == 0)
{
return Task.FromResult(new DynamicImageResponse { HasImage = false });
}
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return GetImage((Audio)item, imageStreams, cancellationToken);
}
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public async Task<DynamicImageResponse> GetImage(Audio item, List<MediaStream> imageStreams, CancellationToken cancellationToken)
{
var path = GetAudioImagePath(item);
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if (!_fileSystem.FileExists(path))
{
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var semaphore = GetLock(path);
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// Acquire a lock
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
{
// Check again in case it was saved while waiting for the lock
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if (!_fileSystem.FileExists(path))
{
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_fileSystem.CreateDirectory(Path.GetDirectoryName(path));
var imageStream = imageStreams.FirstOrDefault(i => (i.Comment ?? string.Empty).IndexOf("front", StringComparison.OrdinalIgnoreCase) != -1) ??
imageStreams.FirstOrDefault(i => (i.Comment ?? string.Empty).IndexOf("cover", StringComparison.OrdinalIgnoreCase) != -1);
var imageStreamIndex = imageStream == null ? (int?)null : imageStream.Index;
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using (var stream = await _mediaEncoder.ExtractAudioImage(item.Path, imageStreamIndex, cancellationToken).ConfigureAwait(false))
{
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using (var fileStream = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
{
await stream.CopyToAsync(fileStream).ConfigureAwait(false);
}
}
}
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}
finally
{
semaphore.Release();
}
}
return new DynamicImageResponse
{
HasImage = true,
Path = path
};
}
private string GetAudioImagePath(Audio item)
{
var filename = item.Album ?? string.Empty;
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filename += string.Join(",", item.Artists.ToArray());
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if (!string.IsNullOrWhiteSpace(item.Album))
{
filename += "_" + item.Album;
}
else if (!string.IsNullOrWhiteSpace(item.Name))
{
filename += "_" + item.Name;
}
else
{
filename += "_" + item.Id.ToString("N");
}
filename = filename.GetMD5() + ".jpg";
var prefix = filename.Substring(0, 1);
return Path.Combine(AudioImagesPath, prefix, filename);
}
public string AudioImagesPath
{
get
{
return Path.Combine(_config.ApplicationPaths.CachePath, "extracted-audio-images");
}
}
/// <summary>
/// Gets the lock.
/// </summary>
/// <param name="filename">The filename.</param>
/// <returns>SemaphoreSlim.</returns>
private SemaphoreSlim GetLock(string filename)
{
return _locks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
}
public string Name
{
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get { return "Image Extractor"; }
}
public bool Supports(IHasImages item)
{
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var audio = item as Audio;
return item.LocationType == LocationType.FileSystem && audio != null && !audio.IsArchive;
}
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public bool HasChanged(IHasMetadata item, IDirectoryService directoryService)
{
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if (item.DateModifiedDuringLastRefresh.HasValue)
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{
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return item.DateModifiedDuringLastRefresh.Value != item.DateModified;
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}
return false;
}
}
}