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using MediaBrowser.Common.IO;
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using MediaBrowser.Controller;
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using MediaBrowser.Controller.Entities;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.MediaEncoding;
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using ServiceStack;
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using System;
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using System.Collections.Concurrent;
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using System.Globalization;
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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.Api.Playback
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{
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[Route("/Videos/{Id}/index.bif", "GET")]
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public class GetBifFile
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{
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[ApiMember(Name = "MediaSourceId", Description = "The media version id, if playing an alternate version", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "GET")]
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public string MediaSourceId { get; set; }
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[ApiMember(Name = "MaxWidth", Description = "Optional. The maximum horizontal resolution of the encoded video.", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
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public int? MaxWidth { get; set; }
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[ApiMember(Name = "Id", Description = "Item Id", IsRequired = true, DataType = "string", ParameterType = "path", Verb = "GET")]
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public string Id { get; set; }
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}
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public class BifService : BaseApiService
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{
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private readonly IServerApplicationPaths _appPaths;
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private readonly ILibraryManager _libraryManager;
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private readonly IMediaEncoder _mediaEncoder;
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private readonly IFileSystem _fileSystem;
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public BifService(IServerApplicationPaths appPaths, ILibraryManager libraryManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem)
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{
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_appPaths = appPaths;
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_libraryManager = libraryManager;
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_mediaEncoder = mediaEncoder;
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_fileSystem = fileSystem;
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}
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public object Get(GetBifFile request)
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{
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return ToStaticFileResult(GetBifFile(request).Result);
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}
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private async Task<string> GetBifFile(GetBifFile request)
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{
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var widthVal = request.MaxWidth.HasValue ? request.MaxWidth.Value.ToString(CultureInfo.InvariantCulture) : string.Empty;
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var item = _libraryManager.GetItemById(request.Id);
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var mediaSources = ((IHasMediaSources)item).GetMediaSources(false).ToList();
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var mediaSource = mediaSources.FirstOrDefault(i => string.Equals(i.Id, request.MediaSourceId)) ?? mediaSources.First();
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var path = Path.Combine(_appPaths.ImageCachePath, "bif", request.Id, request.MediaSourceId, widthVal, "index.bif");
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if (File.Exists(path))
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{
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return path;
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}
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var protocol = mediaSource.Protocol;
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var inputPath = MediaEncoderHelpers.GetInputArgument(mediaSource.Path, protocol, null, mediaSource.PlayableStreamFileNames);
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var semaphore = GetLock(path);
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await semaphore.WaitAsync().ConfigureAwait(false);
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try
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{
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if (File.Exists(path))
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{
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return path;
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}
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await _mediaEncoder.ExtractVideoImagesOnInterval(inputPath, protocol, mediaSource.Video3DFormat,
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TimeSpan.FromSeconds(10), Path.GetDirectoryName(path), "img_", request.MaxWidth, CancellationToken.None)
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.ConfigureAwait(false);
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var images = new DirectoryInfo(Path.GetDirectoryName(path))
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.EnumerateFiles()
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.Where(img => string.Equals(img.Extension, ".jpg", StringComparison.Ordinal))
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.OrderBy(i => i.FullName)
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.ToList();
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using (var fs = _fileSystem.GetFileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read, true))
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{
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var magicNumber = new byte[] { 0x89, 0x42, 0x49, 0x46, 0x0d, 0x0a, 0x1a, 0x0a };
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await fs.WriteAsync(magicNumber, 0, magicNumber.Length);
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// version
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var bytes = GetBytes(0);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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// image count
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bytes = GetBytes(images.Count);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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// interval in ms
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bytes = GetBytes(10000);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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// reserved
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for (var i = 20; i <= 63; i++)
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{
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bytes = new byte[] { 0x00 };
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await fs.WriteAsync(bytes, 0, bytes.Length);
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}
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// write the bif index
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var index = 0;
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long imageOffset = 64 + (8 * images.Count) + 8;
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foreach (var img in images)
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{
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bytes = GetBytes(index);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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bytes = GetBytes(imageOffset);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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imageOffset += img.Length;
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index++;
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}
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bytes = new byte[] { 0xff, 0xff, 0xff, 0xff };
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await fs.WriteAsync(bytes, 0, bytes.Length);
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bytes = GetBytes(imageOffset);
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await fs.WriteAsync(bytes, 0, bytes.Length);
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// write the images
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foreach (var img in images)
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{
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using (var imgStream = _fileSystem.GetFileStream(img.FullName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true))
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{
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await imgStream.CopyToAsync(fs).ConfigureAwait(false);
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}
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}
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}
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return path;
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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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private byte[] GetBytes(int value)
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{
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byte[] bytes = BitConverter.GetBytes(value);
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if (BitConverter.IsLittleEndian)
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Array.Reverse(bytes);
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return bytes;
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}
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private byte[] GetBytes(long value)
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{
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var intVal = Convert.ToInt32(value);
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return GetBytes(intVal);
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//byte[] bytes = BitConverter.GetBytes(value);
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//if (BitConverter.IsLittleEndian)
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// Array.Reverse(bytes);
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//return bytes;
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}
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private static readonly ConcurrentDictionary<string, SemaphoreSlim> SemaphoreLocks = new ConcurrentDictionary<string, SemaphoreSlim>();
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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>System.Object.</returns>
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private static SemaphoreSlim GetLock(string filename)
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{
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return SemaphoreLocks.GetOrAdd(filename, key => new SemaphoreSlim(1, 1));
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}
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}
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}
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Stephen
10 years ago