jellyfin-server/MediaBrowser.Providers/MediaInfo/AudioImageProvider.cs
2015-09-13 17:32:02 -04:00

153 lines
5.0 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.Audio;
using MediaBrowser.Controller.MediaEncoding;
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;
namespace MediaBrowser.Providers.MediaInfo
{
/// <summary>
/// Uses ffmpeg to create video images
/// </summary>
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;
// Can't extract if we didn't find a video stream in the file
if (!audio.HasEmbeddedImage)
{
return Task.FromResult(new DynamicImageResponse { HasImage = false });
}
return GetImage((Audio)item, cancellationToken);
}
public async Task<DynamicImageResponse> GetImage(Audio item, CancellationToken cancellationToken)
{
var path = GetAudioImagePath(item);
if (!_fileSystem.FileExists(path))
{
var semaphore = GetLock(path);
// Acquire a lock
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
// Check again in case it was saved while waiting for the lock
if (!_fileSystem.FileExists(path))
{
_fileSystem.CreateDirectory(Path.GetDirectoryName(path));
using (var stream = await _mediaEncoder.ExtractAudioImage(item.Path, cancellationToken).ConfigureAwait(false))
{
using (var fileStream = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
{
await stream.CopyToAsync(fileStream).ConfigureAwait(false);
}
}
}
}
finally
{
semaphore.Release();
}
}
return new DynamicImageResponse
{
HasImage = true,
Path = path
};
}
private string GetAudioImagePath(Audio item)
{
var album = item.AlbumEntity;
var filename = item.Album ?? string.Empty;
filename += string.Join(",", item.Artists.ToArray());
filename += album == null ? item.Id.ToString("N") + "_primary" + item.DateModified.Ticks : album.Id.ToString("N") + album.DateModified.Ticks + "_primary";
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
{
get { return "Image Extractor"; }
}
public bool Supports(IHasImages item)
{
var audio = item as Audio;
return item.LocationType == LocationType.FileSystem && audio != null && !audio.IsArchive;
}
public bool HasChanged(IHasMetadata item, MetadataStatus status, IDirectoryService directoryService)
{
if (status.ItemDateModified.HasValue)
{
if (status.ItemDateModified.Value != item.DateModified)
{
return true;
}
}
return false;
}
}
}