702 lines
25 KiB
C#
702 lines
25 KiB
C#
using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Channels;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Dlna;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.LiveTv;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.Dlna;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.IO;
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using ServiceStack;
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using System;
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using System.Collections.Generic;
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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.Text;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Api.Playback.Hls
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{
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/// <summary>
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/// Options is needed for chromecast. Threw Head in there since it's related
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/// </summary>
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[Route("/Videos/{Id}/master.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
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[Route("/Videos/{Id}/master.m3u8", "HEAD", Summary = "Gets a video stream using HTTP live streaming.")]
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public class GetMasterHlsVideoStream : VideoStreamRequest
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{
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public bool EnableAdaptiveBitrateStreaming { get; set; }
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public GetMasterHlsVideoStream()
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{
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EnableAdaptiveBitrateStreaming = true;
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}
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}
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[Route("/Videos/{Id}/main.m3u8", "GET", Summary = "Gets a video stream using HTTP live streaming.")]
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public class GetMainHlsVideoStream : VideoStreamRequest
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{
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}
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/// <summary>
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/// Class GetHlsVideoSegment
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/// </summary>
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[Route("/Videos/{Id}/hlsdynamic/{PlaylistId}/{SegmentId}.ts", "GET")]
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[Api(Description = "Gets an Http live streaming segment file. Internal use only.")]
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public class GetDynamicHlsVideoSegment : VideoStreamRequest
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{
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public string PlaylistId { get; set; }
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/// <summary>
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/// Gets or sets the segment id.
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/// </summary>
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/// <value>The segment id.</value>
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public string SegmentId { get; set; }
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}
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public class DynamicHlsService : BaseHlsService
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{
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protected INetworkManager NetworkManager { get; private set; }
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public DynamicHlsService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, ILiveTvManager liveTvManager, IDlnaManager dlnaManager, IChannelManager channelManager, ISubtitleEncoder subtitleEncoder, INetworkManager networkManager)
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: base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, liveTvManager, dlnaManager, channelManager, subtitleEncoder)
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{
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NetworkManager = networkManager;
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}
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public object Get(GetMasterHlsVideoStream request)
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{
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var result = GetAsync(request, "GET").Result;
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return result;
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}
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public object Head(GetMasterHlsVideoStream request)
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{
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var result = GetAsync(request, "HEAD").Result;
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return result;
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}
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public object Get(GetMainHlsVideoStream request)
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{
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var result = GetPlaylistAsync(request, "main").Result;
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return result;
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}
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public object Get(GetDynamicHlsVideoSegment request)
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{
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return GetDynamicSegment(request, request.SegmentId).Result;
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}
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private async Task<object> GetDynamicSegment(VideoStreamRequest request, string segmentId)
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{
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if ((request.StartTimeTicks ?? 0) > 0)
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{
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throw new ArgumentException("StartTimeTicks is not allowed.");
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}
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var cancellationTokenSource = new CancellationTokenSource();
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var cancellationToken = cancellationTokenSource.Token;
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var index = int.Parse(segmentId, NumberStyles.Integer, UsCulture);
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var state = await GetState(request, cancellationToken).ConfigureAwait(false);
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var playlistPath = Path.ChangeExtension(state.OutputFilePath, ".m3u8");
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var segmentPath = GetSegmentPath(playlistPath, index);
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var segmentLength = state.SegmentLength;
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var segmentExtension = GetSegmentFileExtension(state);
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TranscodingJob job = null;
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if (File.Exists(segmentPath))
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{
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job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
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}
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await ApiEntryPoint.Instance.TranscodingStartLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false);
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try
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{
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if (File.Exists(segmentPath))
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{
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job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType);
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return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
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if (currentTranscodingIndex == null || index < currentTranscodingIndex.Value || (index - currentTranscodingIndex.Value) > 4)
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{
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// If the playlist doesn't already exist, startup ffmpeg
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try
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{
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ApiEntryPoint.Instance.KillTranscodingJobs(j => j.Type == TranscodingJobType && string.Equals(j.DeviceId, request.DeviceId, StringComparison.OrdinalIgnoreCase), p => !string.Equals(p, playlistPath, StringComparison.OrdinalIgnoreCase));
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if (currentTranscodingIndex.HasValue)
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{
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DeleteLastFile(playlistPath, segmentExtension, 0);
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}
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var startSeconds = index * state.SegmentLength;
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request.StartTimeTicks = TimeSpan.FromSeconds(startSeconds).Ticks;
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job = await StartFfMpeg(state, playlistPath, cancellationTokenSource).ConfigureAwait(false);
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}
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catch
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{
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state.Dispose();
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throw;
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}
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await WaitForMinimumSegmentCount(playlistPath, 2, cancellationTokenSource.Token).ConfigureAwait(false);
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}
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}
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}
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finally
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{
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ApiEntryPoint.Instance.TranscodingStartLock.Release();
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}
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Logger.Info("waiting for {0}", segmentPath);
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while (!File.Exists(segmentPath))
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{
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await Task.Delay(50, cancellationToken).ConfigureAwait(false);
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}
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Logger.Info("returning {0}", segmentPath);
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job = job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
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return await GetSegmentResult(playlistPath, segmentPath, index, segmentLength, job, cancellationToken).ConfigureAwait(false);
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}
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public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension)
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{
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var file = GetLastTranscodingFile(playlist, segmentExtension, FileSystem);
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if (file == null)
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{
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return null;
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}
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var playlistFilename = Path.GetFileNameWithoutExtension(playlist);
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var indexString = Path.GetFileNameWithoutExtension(file.Name).Substring(playlistFilename.Length);
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return int.Parse(indexString, NumberStyles.Integer, UsCulture);
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}
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private void DeleteLastFile(string path, string segmentExtension, int retryCount)
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{
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if (retryCount >= 5)
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{
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return;
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}
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var file = GetLastTranscodingFile(path, segmentExtension, FileSystem);
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if (file != null)
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{
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try
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{
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File.Delete(file.FullName);
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}
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catch (IOException ex)
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{
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Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
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Thread.Sleep(100);
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DeleteLastFile(path, segmentExtension, retryCount + 1);
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}
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catch (Exception ex)
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{
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Logger.ErrorException("Error deleting partial stream file(s) {0}", ex, file.FullName);
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}
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}
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}
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private static FileInfo GetLastTranscodingFile(string playlist, string segmentExtension, IFileSystem fileSystem)
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{
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var folder = Path.GetDirectoryName(playlist);
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try
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{
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return new DirectoryInfo(folder)
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.EnumerateFiles("*", SearchOption.TopDirectoryOnly)
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.Where(i => string.Equals(i.Extension, segmentExtension, StringComparison.OrdinalIgnoreCase))
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.OrderByDescending(fileSystem.GetLastWriteTimeUtc)
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.FirstOrDefault();
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}
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catch (DirectoryNotFoundException)
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{
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return null;
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}
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}
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protected override int GetStartNumber(StreamState state)
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{
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return GetStartNumber(state.VideoRequest);
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}
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private int GetStartNumber(VideoStreamRequest request)
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{
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var segmentId = "0";
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var segmentRequest = request as GetDynamicHlsVideoSegment;
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if (segmentRequest != null)
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{
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segmentId = segmentRequest.SegmentId;
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}
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return int.Parse(segmentId, NumberStyles.Integer, UsCulture);
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}
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private string GetSegmentPath(string playlist, int index)
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{
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var folder = Path.GetDirectoryName(playlist);
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var filename = Path.GetFileNameWithoutExtension(playlist);
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return Path.Combine(folder, filename + index.ToString(UsCulture) + ".ts");
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}
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private async Task<object> GetSegmentResult(string playlistPath,
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string segmentPath,
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int segmentIndex,
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int segmentLength,
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TranscodingJob transcodingJob,
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CancellationToken cancellationToken)
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{
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// If all transcoding has completed, just return immediately
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if (!IsTranscoding(playlistPath))
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{
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return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
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}
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var segmentFilename = Path.GetFileName(segmentPath);
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using (var fileStream = FileSystem.GetFileStream(playlistPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true))
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{
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using (var reader = new StreamReader(fileStream))
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{
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var text = await reader.ReadToEndAsync().ConfigureAwait(false);
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// If it appears in the playlist, it's done
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if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
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{
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return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
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}
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}
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}
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// if a different file is encoding, it's done
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//var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath);
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//if (currentTranscodingIndex > segmentIndex)
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//{
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//return GetSegmentResult(segmentPath, segmentIndex);
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//}
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// Wait for the file to stop being written to, then stream it
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var length = new FileInfo(segmentPath).Length;
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var eofCount = 0;
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while (eofCount < 10)
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{
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var info = new FileInfo(segmentPath);
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if (!info.Exists)
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{
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break;
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}
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var newLength = info.Length;
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if (newLength == length)
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{
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eofCount++;
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}
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else
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{
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eofCount = 0;
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}
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length = newLength;
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await Task.Delay(100, cancellationToken).ConfigureAwait(false);
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}
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return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
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}
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private object GetSegmentResult(string segmentPath, int index, int segmentLength, TranscodingJob transcodingJob)
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{
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var segmentEndingSeconds = (1 + index) * segmentLength;
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var segmentEndingPositionTicks = TimeSpan.FromSeconds(segmentEndingSeconds).Ticks;
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return ResultFactory.GetStaticFileResult(Request, new StaticFileResultOptions
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{
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Path = segmentPath,
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FileShare = FileShare.ReadWrite,
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OnComplete = () =>
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{
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if (transcodingJob != null)
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{
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transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks);
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}
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}
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});
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}
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private bool IsTranscoding(string playlistPath)
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{
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var job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
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return job != null && !job.HasExited;
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}
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private async Task<object> GetAsync(GetMasterHlsVideoStream request, string method)
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{
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var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
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if (string.Equals(request.AudioCodec, "copy", StringComparison.OrdinalIgnoreCase))
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{
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throw new ArgumentException("Audio codec copy is not allowed here.");
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}
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if (string.Equals(request.VideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
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{
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throw new ArgumentException("Video codec copy is not allowed here.");
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}
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if (string.IsNullOrEmpty(request.MediaSourceId))
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{
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throw new ArgumentException("MediaSourceId is required");
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}
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var playlistText = string.Empty;
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if (string.Equals(method, "GET", StringComparison.OrdinalIgnoreCase))
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{
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var audioBitrate = state.OutputAudioBitrate ?? 0;
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var videoBitrate = state.OutputVideoBitrate ?? 0;
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playlistText = GetMasterPlaylistFileText(state, videoBitrate + audioBitrate);
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}
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return ResultFactory.GetResult(playlistText, Common.Net.MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
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}
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private string GetMasterPlaylistFileText(StreamState state, int totalBitrate)
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{
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var builder = new StringBuilder();
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builder.AppendLine("#EXTM3U");
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var queryStringIndex = Request.RawUrl.IndexOf('?');
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var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
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var isLiveStream = (state.RunTimeTicks ?? 0) == 0;
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// Main stream
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var playlistUrl = isLiveStream ? "live.m3u8" : "main.m3u8";
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playlistUrl += queryString;
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var request = (GetMasterHlsVideoStream)state.Request;
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var subtitleStreams = state.AllMediaStreams
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.Where(i => i.IsTextSubtitleStream)
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.ToList();
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var subtitleGroup = subtitleStreams.Count > 0 && request.SubtitleMethod == SubtitleDeliveryMethod.Hls ?
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"subs" :
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null;
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AppendPlaylist(builder, playlistUrl, totalBitrate, subtitleGroup);
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if (EnableAdaptiveBitrateStreaming(state, isLiveStream))
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{
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var requestedVideoBitrate = state.VideoRequest.VideoBitRate.Value;
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// By default, vary by just 200k
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var variation = GetBitrateVariation(totalBitrate);
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var newBitrate = totalBitrate - variation;
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var variantUrl = ReplaceBitrate(playlistUrl, requestedVideoBitrate, (requestedVideoBitrate - variation));
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AppendPlaylist(builder, variantUrl, newBitrate, subtitleGroup);
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variation *= 2;
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newBitrate = totalBitrate - variation;
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variantUrl = ReplaceBitrate(playlistUrl, requestedVideoBitrate, (requestedVideoBitrate - variation));
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AppendPlaylist(builder, variantUrl, newBitrate, subtitleGroup);
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}
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if (!string.IsNullOrWhiteSpace(subtitleGroup))
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{
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AddSubtitles(state, subtitleStreams, builder);
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}
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return builder.ToString();
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}
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private string ReplaceBitrate(string url, int oldValue, int newValue)
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{
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return url.Replace(
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"videobitrate=" + oldValue.ToString(UsCulture),
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"videobitrate=" + newValue.ToString(UsCulture),
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StringComparison.OrdinalIgnoreCase);
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}
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private void AddSubtitles(StreamState state, IEnumerable<MediaStream> subtitles, StringBuilder builder)
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{
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var selectedIndex = state.SubtitleStream == null ? (int?)null : state.SubtitleStream.Index;
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foreach (var stream in subtitles)
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{
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const string format = "#EXT-X-MEDIA:TYPE=SUBTITLES,GROUP-ID=\"subs\",NAME=\"{0}\",DEFAULT={1},FORCED={2},URI=\"{3}\",LANGUAGE=\"{4}\"";
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var name = stream.Language;
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var isDefault = selectedIndex.HasValue && selectedIndex.Value == stream.Index;
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var isForced = stream.IsForced;
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if (string.IsNullOrWhiteSpace(name)) name = stream.Codec ?? "Unknown";
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var url = string.Format("{0}/Subtitles/{1}/subtitles.m3u8?SegmentLength={2}",
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state.Request.MediaSourceId,
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stream.Index.ToString(UsCulture),
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30.ToString(UsCulture));
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var line = string.Format(format,
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name,
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isDefault ? "YES" : "NO",
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isForced ? "YES" : "NO",
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url,
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stream.Language ?? "Unknown");
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builder.AppendLine(line);
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}
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}
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private bool EnableAdaptiveBitrateStreaming(StreamState state, bool isLiveStream)
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{
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// Within the local network this will likely do more harm than good.
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if (Request.IsLocal || NetworkManager.IsInLocalNetwork(Request.RemoteIp))
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{
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return false;
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}
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var request = state.Request as GetMasterHlsVideoStream;
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if (request != null && !request.EnableAdaptiveBitrateStreaming)
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{
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return false;
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}
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if (isLiveStream || string.IsNullOrWhiteSpace(state.MediaPath))
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{
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// Opening live streams is so slow it's not even worth it
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return false;
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}
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return state.VideoRequest.VideoBitRate.HasValue;
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}
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private void AppendPlaylist(StringBuilder builder, string url, int bitrate, string subtitleGroup)
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{
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var header = "#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + bitrate.ToString(UsCulture);
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if (!string.IsNullOrWhiteSpace(subtitleGroup))
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{
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header += string.Format(",SUBTITLES=\"{0}\"", subtitleGroup);
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}
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builder.AppendLine(header);
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builder.AppendLine(url);
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}
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private int GetBitrateVariation(int bitrate)
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{
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// By default, vary by just 50k
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var variation = 50000;
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if (bitrate >= 10000000)
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{
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variation = 2000000;
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}
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else if (bitrate >= 5000000)
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{
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variation = 1500000;
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}
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else if (bitrate >= 3000000)
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{
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variation = 1000000;
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}
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else if (bitrate >= 2000000)
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{
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variation = 500000;
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}
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else if (bitrate >= 1000000)
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{
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|
variation = 300000;
|
|
}
|
|
else if (bitrate >= 600000)
|
|
{
|
|
variation = 200000;
|
|
}
|
|
else if (bitrate >= 400000)
|
|
{
|
|
variation = 100000;
|
|
}
|
|
|
|
return variation;
|
|
}
|
|
|
|
private async Task<object> GetPlaylistAsync(VideoStreamRequest request, string name)
|
|
{
|
|
var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
|
|
|
|
var builder = new StringBuilder();
|
|
|
|
builder.AppendLine("#EXTM3U");
|
|
builder.AppendLine("#EXT-X-VERSION:3");
|
|
builder.AppendLine("#EXT-X-TARGETDURATION:" + state.SegmentLength.ToString(UsCulture));
|
|
builder.AppendLine("#EXT-X-MEDIA-SEQUENCE:0");
|
|
builder.AppendLine("#EXT-X-ALLOW-CACHE:NO");
|
|
|
|
var queryStringIndex = Request.RawUrl.IndexOf('?');
|
|
var queryString = queryStringIndex == -1 ? string.Empty : Request.RawUrl.Substring(queryStringIndex);
|
|
|
|
var seconds = TimeSpan.FromTicks(state.RunTimeTicks ?? 0).TotalSeconds;
|
|
|
|
var index = 0;
|
|
|
|
while (seconds > 0)
|
|
{
|
|
var length = seconds >= state.SegmentLength ? state.SegmentLength : seconds;
|
|
|
|
builder.AppendLine("#EXTINF:" + length.ToString(UsCulture) + ",");
|
|
|
|
builder.AppendLine(string.Format("hlsdynamic/{0}/{1}.ts{2}",
|
|
|
|
name,
|
|
index.ToString(UsCulture),
|
|
queryString));
|
|
|
|
seconds -= state.SegmentLength;
|
|
index++;
|
|
}
|
|
|
|
builder.AppendLine("#EXT-X-ENDLIST");
|
|
|
|
var playlistText = builder.ToString();
|
|
|
|
return ResultFactory.GetResult(playlistText, Common.Net.MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
|
|
}
|
|
|
|
protected override string GetAudioArguments(StreamState state)
|
|
{
|
|
var codec = state.OutputAudioCodec;
|
|
|
|
if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return "-codec:a:0 copy";
|
|
}
|
|
|
|
var args = "-codec:a:0 " + codec;
|
|
|
|
var channels = state.OutputAudioChannels;
|
|
|
|
if (channels.HasValue)
|
|
{
|
|
args += " -ac " + channels.Value;
|
|
}
|
|
|
|
var bitrate = state.OutputAudioBitrate;
|
|
|
|
if (bitrate.HasValue)
|
|
{
|
|
args += " -ab " + bitrate.Value.ToString(UsCulture);
|
|
}
|
|
|
|
args += " " + GetAudioFilterParam(state, true);
|
|
|
|
return args;
|
|
}
|
|
|
|
protected override string GetVideoArguments(StreamState state)
|
|
{
|
|
var codec = state.OutputVideoCodec;
|
|
|
|
// See if we can save come cpu cycles by avoiding encoding
|
|
if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
|
|
{
|
|
return IsH264(state.VideoStream) ? "-codec:v:0 copy -bsf:v h264_mp4toannexb" : "-codec:v:0 copy";
|
|
}
|
|
|
|
var keyFrameArg = string.Format(" -force_key_frames expr:gte(t,n_forced*{0})",
|
|
state.SegmentLength.ToString(UsCulture));
|
|
|
|
var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream;
|
|
|
|
var args = "-codec:v:0 " + codec + " " + GetVideoQualityParam(state, "libx264", true) + keyFrameArg;
|
|
|
|
// Add resolution params, if specified
|
|
if (!hasGraphicalSubs)
|
|
{
|
|
args += GetOutputSizeParam(state, codec, false);
|
|
}
|
|
|
|
// This is for internal graphical subs
|
|
if (hasGraphicalSubs)
|
|
{
|
|
args += GetGraphicalSubtitleParam(state, codec);
|
|
}
|
|
|
|
return args;
|
|
}
|
|
|
|
protected override string GetCommandLineArguments(string outputPath, string transcodingJobId, StreamState state, bool isEncoding)
|
|
{
|
|
var threads = GetNumberOfThreads(state, false);
|
|
|
|
var inputModifier = GetInputModifier(state);
|
|
|
|
// If isEncoding is true we're actually starting ffmpeg
|
|
var startNumberParam = isEncoding ? GetStartNumber(state).ToString(UsCulture) : "0";
|
|
|
|
var args = string.Format("{0} -i {1} -map_metadata -1 -threads {2} {3} {4} -copyts -flags -global_header {5} -hls_time {6} -start_number {7} -hls_list_size {8} -y \"{9}\"",
|
|
inputModifier,
|
|
GetInputArgument(transcodingJobId, state),
|
|
threads,
|
|
GetMapArgs(state),
|
|
GetVideoArguments(state),
|
|
GetAudioArguments(state),
|
|
state.SegmentLength.ToString(UsCulture),
|
|
startNumberParam,
|
|
state.HlsListSize.ToString(UsCulture),
|
|
outputPath
|
|
).Trim();
|
|
|
|
return args;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Gets the segment file extension.
|
|
/// </summary>
|
|
/// <param name="state">The state.</param>
|
|
/// <returns>System.String.</returns>
|
|
protected override string GetSegmentFileExtension(StreamState state)
|
|
{
|
|
return ".ts";
|
|
}
|
|
}
|
|
}
|