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225 lines
7.5 KiB
C#
225 lines
7.5 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.MediaInfo;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Entities.Audio;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.Providers;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.Logging;
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using System;
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using System.Collections.Concurrent;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Providers.MediaInfo
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{
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/// <summary>
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/// Uses ffmpeg to create video images
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/// </summary>
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public class AudioImageProvider : BaseMetadataProvider
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{
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/// <summary>
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/// The _locks
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/// </summary>
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private readonly ConcurrentDictionary<string, SemaphoreSlim> _locks = new ConcurrentDictionary<string, SemaphoreSlim>();
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/// <summary>
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/// The _media encoder
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/// </summary>
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private readonly IMediaEncoder _mediaEncoder;
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/// <summary>
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/// Initializes a new instance of the <see cref="BaseMetadataProvider" /> class.
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/// </summary>
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/// <param name="logManager">The log manager.</param>
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/// <param name="configurationManager">The configuration manager.</param>
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/// <param name="mediaEncoder">The media encoder.</param>
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public AudioImageProvider(ILogManager logManager, IServerConfigurationManager configurationManager, IMediaEncoder mediaEncoder)
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: base(logManager, configurationManager)
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{
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_mediaEncoder = mediaEncoder;
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}
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/// <summary>
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/// Gets a value indicating whether [refresh on version change].
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/// </summary>
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/// <value><c>true</c> if [refresh on version change]; otherwise, <c>false</c>.</value>
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protected override bool RefreshOnVersionChange
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{
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get
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{
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return true;
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}
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}
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/// <summary>
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/// Gets the provider version.
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/// </summary>
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/// <value>The provider version.</value>
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protected override string ProviderVersion
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{
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get
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{
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return "1";
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}
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}
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/// <summary>
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/// Supportses the specified item.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
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public override bool Supports(BaseItem item)
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{
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return item.LocationType == LocationType.FileSystem && item is Audio;
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}
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/// <summary>
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/// Override this to return the date that should be compared to the last refresh date
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/// to determine if this provider should be re-fetched.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns>DateTime.</returns>
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protected override DateTime CompareDate(BaseItem item)
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{
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return item.DateModified;
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}
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/// <summary>
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/// Gets the priority.
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/// </summary>
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/// <value>The priority.</value>
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public override MetadataProviderPriority Priority
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{
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get { return MetadataProviderPriority.Last; }
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}
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public override ItemUpdateType ItemUpdateType
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{
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get
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{
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return ItemUpdateType.ImageUpdate;
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}
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}
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/// <summary>
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/// Fetches metadata and returns true or false indicating if any work that requires persistence was done
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="force">if set to <c>true</c> [force].</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{System.Boolean}.</returns>
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public override async Task<bool> FetchAsync(BaseItem item, bool force, BaseProviderInfo providerInfo, CancellationToken cancellationToken)
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{
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item.ValidateImages();
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var audio = (Audio)item;
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if (string.IsNullOrEmpty(audio.PrimaryImagePath) && audio.HasEmbeddedImage)
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{
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try
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{
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await CreateImagesForSong(audio, cancellationToken).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error extracting image for {0}", ex, item.Name);
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}
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}
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SetLastRefreshed(item, DateTime.UtcNow, providerInfo);
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return true;
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}
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/// <summary>
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/// Creates the images for song.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.InvalidOperationException">Can't extract an image unless the audio file has an embedded image.</exception>
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private async Task CreateImagesForSong(Audio item, CancellationToken cancellationToken)
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{
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cancellationToken.ThrowIfCancellationRequested();
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var path = GetAudioImagePath(item);
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if (!File.Exists(path))
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{
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var semaphore = GetLock(path);
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// Acquire a lock
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await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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// Check again
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if (!File.Exists(path))
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{
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try
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{
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var parentPath = Path.GetDirectoryName(path);
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Directory.CreateDirectory(parentPath);
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await _mediaEncoder.ExtractImage(new[] { item.Path }, InputType.AudioFile, null, null, path, cancellationToken).ConfigureAwait(false);
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}
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finally
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{
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semaphore.Release();
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}
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}
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else
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{
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semaphore.Release();
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}
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}
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// Image is already in the cache
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item.PrimaryImagePath = path;
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}
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/// <summary>
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/// Gets the audio image path.
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/// </summary>
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/// <param name="item">The item.</param>
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/// <returns>System.String.</returns>
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private string GetAudioImagePath(Audio item)
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{
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var album = item.Parent as MusicAlbum;
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var filename = item.Album ?? string.Empty;
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filename += item.Artists.FirstOrDefault() ?? string.Empty;
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filename += album == null ? item.Id.ToString("N") + "_primary" + item.DateModified.Ticks : album.Id.ToString("N") + album.DateModified.Ticks + "_primary";
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filename = filename.GetMD5() + ".jpg";
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var prefix = filename.Substring(0, 1);
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return Path.Combine(AudioImagesPath, prefix, filename);
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}
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/// <summary>
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/// Gets the audio images data path.
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/// </summary>
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/// <value>The audio images data path.</value>
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public string AudioImagesPath
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{
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get
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{
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return Path.Combine(ConfigurationManager.ApplicationPaths.DataPath, "extracted-audio-images");
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}
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}
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/// <summary>
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/// Gets the lock.
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/// </summary>
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/// <param name="filename">The filename.</param>
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/// <returns>SemaphoreSlim.</returns>
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private SemaphoreSlim GetLock(string filename)
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{
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return _locks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
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}
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}
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}
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