jellyfin/MediaBrowser.Providers/MediaInfo/VideoImageProvider.cs
2013-12-19 16:51:32 -05:00

331 lines
11 KiB
C#

using MediaBrowser.Common.Extensions;
using MediaBrowser.Common.MediaInfo;
using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.MediaInfo;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Concurrent;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Providers.MediaInfo
{
class VideoImageProvider : BaseMetadataProvider
{
/// <summary>
/// The _locks
/// </summary>
private readonly ConcurrentDictionary<string, SemaphoreSlim> _locks = new ConcurrentDictionary<string, SemaphoreSlim>();
/// <summary>
/// The _media encoder
/// </summary>
private readonly IMediaEncoder _mediaEncoder;
private readonly IIsoManager _isoManager;
public VideoImageProvider(ILogManager logManager, IServerConfigurationManager configurationManager, IMediaEncoder mediaEncoder, IIsoManager isoManager)
: base(logManager, configurationManager)
{
_mediaEncoder = mediaEncoder;
_isoManager = isoManager;
}
/// <summary>
/// Gets a value indicating whether [refresh on version change].
/// </summary>
/// <value><c>true</c> if [refresh on version change]; otherwise, <c>false</c>.</value>
protected override bool RefreshOnVersionChange
{
get
{
return true;
}
}
/// <summary>
/// Gets the provider version.
/// </summary>
/// <value>The provider version.</value>
protected override string ProviderVersion
{
get
{
return "1";
}
}
/// <summary>
/// Supportses the specified item.
/// </summary>
/// <param name="item">The item.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
public override bool Supports(BaseItem item)
{
return item.LocationType == LocationType.FileSystem && item is Video;
}
/// <summary>
/// Needses the refresh internal.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="providerInfo">The provider info.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
protected override bool NeedsRefreshInternal(BaseItem item, BaseProviderInfo providerInfo)
{
var video = (Video)item;
if (!QualifiesForExtraction(video))
{
return false;
}
return base.NeedsRefreshInternal(item, providerInfo);
}
/// <summary>
/// Qualifieses for extraction.
/// </summary>
/// <param name="item">The item.</param>
/// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
private bool QualifiesForExtraction(Video item)
{
if (!ConfigurationManager.Configuration.EnableVideoImageExtraction)
{
return false;
}
if (!string.IsNullOrEmpty(item.PrimaryImagePath))
{
return false;
}
// No support for this
if (item.VideoType == VideoType.HdDvd)
{
return false;
}
// Can't extract from iso's if we weren't unable to determine iso type
if (item.VideoType == VideoType.Iso && !item.IsoType.HasValue)
{
return false;
}
// Can't extract if we didn't find a video stream in the file
if (!item.DefaultVideoStreamIndex.HasValue)
{
return false;
}
return true;
}
/// <summary>
/// Override this to return the date that should be compared to the last refresh date
/// to determine if this provider should be re-fetched.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>DateTime.</returns>
protected override DateTime CompareDate(BaseItem item)
{
return item.DateModified;
}
/// <summary>
/// Gets the priority.
/// </summary>
/// <value>The priority.</value>
public override MetadataProviderPriority Priority
{
get { return MetadataProviderPriority.Last; }
}
public override ItemUpdateType ItemUpdateType
{
get
{
return ItemUpdateType.ImageUpdate;
}
}
/// <summary>
/// Fetches metadata and returns true or false indicating if any work that requires persistence was done
/// </summary>
/// <param name="item">The item.</param>
/// <param name="force">if set to <c>true</c> [force].</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{System.Boolean}.</returns>
public override async Task<bool> FetchAsync(BaseItem item, bool force, BaseProviderInfo providerInfo, CancellationToken cancellationToken)
{
item.ValidateImages();
var video = (Video)item;
// Double check this here in case force was used
if (QualifiesForExtraction(video))
{
try
{
await ExtractImage(video, cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
// Swallow this so that we don't keep on trying over and over again
Logger.ErrorException("Error extracting image for {0}", ex, item.Name);
}
}
SetLastRefreshed(item, DateTime.UtcNow, providerInfo);
return true;
}
/// <summary>
/// Extracts the image.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
private async Task ExtractImage(Video item, CancellationToken cancellationToken)
{
cancellationToken.ThrowIfCancellationRequested();
var path = GetVideoImagePath(item);
if (!File.Exists(path))
{
var semaphore = GetLock(path);
// Acquire a lock
await semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
// Check again
if (!File.Exists(path))
{
try
{
var parentPath = Path.GetDirectoryName(path);
Directory.CreateDirectory(parentPath);
await ExtractImageInternal(item, path, cancellationToken).ConfigureAwait(false);
}
finally
{
semaphore.Release();
}
}
else
{
semaphore.Release();
}
}
// Image is already in the cache
item.PrimaryImagePath = path;
}
/// <summary>
/// Extracts the image.
/// </summary>
/// <param name="video">The video.</param>
/// <param name="path">The path.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
private async Task ExtractImageInternal(Video video, string path, CancellationToken cancellationToken)
{
var isoMount = await MountIsoIfNeeded(video, cancellationToken).ConfigureAwait(false);
try
{
// If we know the duration, grab it from 10% into the video. Otherwise just 10 seconds in.
// Always use 10 seconds for dvd because our duration could be out of whack
var imageOffset = video.VideoType != VideoType.Dvd && video.RunTimeTicks.HasValue &&
video.RunTimeTicks.Value > 0
? TimeSpan.FromTicks(Convert.ToInt64(video.RunTimeTicks.Value * .1))
: TimeSpan.FromSeconds(10);
InputType type;
var inputPath = MediaEncoderHelpers.GetInputArgument(video.Path, video.LocationType == LocationType.Remote, video.VideoType, video.IsoType, isoMount, video.PlayableStreamFileNames, out type);
await _mediaEncoder.ExtractImage(inputPath, type, video.Video3DFormat, imageOffset, path, cancellationToken).ConfigureAwait(false);
video.PrimaryImagePath = path;
}
finally
{
if (isoMount != null)
{
isoMount.Dispose();
}
}
}
/// <summary>
/// The null mount task result
/// </summary>
protected readonly Task<IIsoMount> NullMountTaskResult = Task.FromResult<IIsoMount>(null);
/// <summary>
/// Mounts the iso if needed.
/// </summary>
/// <param name="item">The item.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{IIsoMount}.</returns>
protected Task<IIsoMount> MountIsoIfNeeded(Video item, CancellationToken cancellationToken)
{
if (item.VideoType == VideoType.Iso)
{
return _isoManager.Mount(item.Path, cancellationToken);
}
return NullMountTaskResult;
}
/// <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));
}
/// <summary>
/// Gets the video images data path.
/// </summary>
/// <value>The video images data path.</value>
public string VideoImagesPath
{
get
{
return Path.Combine(ConfigurationManager.ApplicationPaths.DataPath, "extracted-video-images");
}
}
/// <summary>
/// Gets the audio image path.
/// </summary>
/// <param name="item">The item.</param>
/// <returns>System.String.</returns>
private string GetVideoImagePath(Video item)
{
var filename = item.Path + "_" + item.DateModified.Ticks + "_primary";
filename = filename.GetMD5() + ".jpg";
var prefix = filename.Substring(0, 1);
return Path.Combine(VideoImagesPath, prefix, filename);
}
}
}