530 lines
19 KiB
C#
530 lines
19 KiB
C#
using MediaBrowser.Common.IO;
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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.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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[Route("/Videos/{Id}/master.m3u8", "GET")]
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[Api(Description = "Gets a video stream using HTTP live streaming.")]
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public class GetMasterHlsVideoStream : VideoStreamRequest
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{
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}
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[Route("/Videos/{Id}/main.m3u8", "GET")]
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[Api(Description = "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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public DynamicHlsService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, ILiveTvManager liveTvManager, IDlnaManager dlnaManager, IChannelManager channelManager, ISubtitleEncoder subtitleEncoder)
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: base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, liveTvManager, dlnaManager, channelManager, subtitleEncoder)
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{
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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).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).Result;
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}
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private async Task<object> GetDynamicSegment(GetDynamicHlsVideoSegment request)
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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(request.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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if (File.Exists(segmentPath))
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{
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ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType.Hls);
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return await GetSegmentResult(playlistPath, segmentPath, index, 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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ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType.Hls);
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return await GetSegmentResult(playlistPath, segmentPath, index, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath);
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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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// TODO: Delete files from other jobs, but not this one
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await ApiEntryPoint.Instance.KillTranscodingJobs(state.Request.DeviceId, TranscodingJobType.Hls, FileDeleteMode.None, false).ConfigureAwait(false);
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if (currentTranscodingIndex.HasValue)
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{
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DeleteLastFile(playlistPath, 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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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, 1, 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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return await GetSegmentResult(playlistPath, segmentPath, index, cancellationToken).ConfigureAwait(false);
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}
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public int? GetCurrentTranscodingIndex(string playlist)
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{
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var file = GetLastTranscodingFile(playlist, 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, 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, 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, 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, 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, ".ts", 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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var request = (GetDynamicHlsVideoSegment)state.Request;
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return int.Parse(request.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, string segmentPath, int segmentIndex, 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 ResultFactory.GetStaticFileResult(Request, segmentPath, FileShare.ReadWrite);
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}
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var segmentFilename = Path.GetFileName(segmentPath);
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// If it appears in the playlist, it's done
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if (File.ReadAllText(playlistPath).IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
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{
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return ResultFactory.GetStaticFileResult(Request, segmentPath, FileShare.ReadWrite);
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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 ResultFactory.GetStaticFileResult(Request, segmentPath, FileShare.ReadWrite);
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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 ResultFactory.GetStaticFileResult(Request, segmentPath, FileShare.ReadWrite);
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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)
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{
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var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
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var audioBitrate = state.OutputAudioBitrate ?? 0;
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var videoBitrate = state.OutputVideoBitrate ?? 0;
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var playlistText = GetMasterPlaylistFileText(state, videoBitrate + audioBitrate);
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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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// Main stream
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var playlistUrl = (state.RunTimeTicks ?? 0) > 0 ? "main.m3u8" : "live.m3u8";
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playlistUrl += queryString;
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AppendPlaylist(builder, playlistUrl, totalBitrate);
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if (state.VideoRequest.VideoBitRate.HasValue)
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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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AppendPlaylist(builder, playlistUrl.Replace(requestedVideoBitrate.ToString(UsCulture), (requestedVideoBitrate - variation).ToString(UsCulture)), newBitrate);
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variation *= 2;
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newBitrate = totalBitrate - variation;
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AppendPlaylist(builder, playlistUrl.Replace(requestedVideoBitrate.ToString(UsCulture), (requestedVideoBitrate - variation).ToString(UsCulture)), newBitrate);
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}
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return builder.ToString();
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}
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private void AppendPlaylist(StringBuilder builder, string url, int bitrate)
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{
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builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + bitrate.ToString(UsCulture));
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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 200k
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var variation = 200000;
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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;
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}
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return variation;
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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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private async Task<object> GetPlaylistAsync(VideoStreamRequest request, string name)
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{
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var state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
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var builder = new StringBuilder();
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builder.AppendLine("#EXTM3U");
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builder.AppendLine("#EXT-X-VERSION:3");
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builder.AppendLine("#EXT-X-TARGETDURATION:" + state.SegmentLength.ToString(UsCulture));
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builder.AppendLine("#EXT-X-MEDIA-SEQUENCE:0");
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builder.AppendLine("#EXT-X-ALLOW-CACHE:NO");
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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 seconds = TimeSpan.FromTicks(state.RunTimeTicks ?? 0).TotalSeconds;
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var index = 0;
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while (seconds > 0)
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{
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var length = seconds >= state.SegmentLength ? state.SegmentLength : seconds;
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builder.AppendLine("#EXTINF:" + length.ToString(UsCulture));
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builder.AppendLine(string.Format("hlsdynamic/{0}/{1}.ts{2}",
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name,
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index.ToString(UsCulture),
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queryString));
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seconds -= state.SegmentLength;
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index++;
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}
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builder.AppendLine("#EXT-X-ENDLIST");
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var playlistText = builder.ToString();
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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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protected override string GetAudioArguments(StreamState state)
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{
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var codec = state.OutputAudioCodec;
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if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
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{
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return "-codec:a:0 copy";
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}
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var args = "-codec:a:0 " + codec;
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var channels = state.OutputAudioChannels;
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if (channels.HasValue)
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{
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args += " -ac " + channels.Value;
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}
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var bitrate = state.OutputAudioBitrate;
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if (bitrate.HasValue)
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{
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args += " -ab " + bitrate.Value.ToString(UsCulture);
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}
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args += " " + GetAudioFilterParam(state, true);
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return args;
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}
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protected override string GetVideoArguments(StreamState state)
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{
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var codec = state.OutputVideoCodec;
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// See if we can save come cpu cycles by avoiding encoding
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if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase))
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{
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// TOOD: Switch to -bsf dump_extra?
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return IsH264(state.VideoStream) ? "-codec:v:0 copy -bsf h264_mp4toannexb" : "-codec:v:0 copy";
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}
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var keyFrameArg = string.Format(" -force_key_frames expr:gte(t,n_forced*{0})",
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state.SegmentLength.ToString(UsCulture));
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var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream;
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var args = "-codec:v:0 " + codec + " " + GetVideoQualityParam(state, "libx264", true) + keyFrameArg;
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// Add resolution params, if specified
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if (!hasGraphicalSubs)
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{
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args += GetOutputSizeParam(state, codec, CancellationToken.None);
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}
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// This is for internal graphical subs
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if (hasGraphicalSubs)
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{
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args += GetInternalGraphicalSubtitleParam(state, codec);
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}
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return args;
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}
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/// <summary>
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/// Gets the command line arguments.
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/// </summary>
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/// <param name="outputPath">The output path.</param>
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/// <param name="state">The state.</param>
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/// <param name="isEncoding">if set to <c>true</c> [is encoding].</param>
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/// <returns>System.String.</returns>
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protected override string GetCommandLineArguments(string outputPath, StreamState state, bool isEncoding)
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{
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var threads = GetNumberOfThreads(state, false);
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var inputModifier = GetInputModifier(state);
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// If isEncoding is true we're actually starting ffmpeg
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var startNumberParam = isEncoding ? GetStartNumber(state).ToString(UsCulture) : "0";
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var args = string.Format("{0} -i {1} -map_metadata -1 -threads {2} {3} {4} -flags -global_header {5} -hls_time {6} -start_number {7} -hls_list_size {8} -y \"{9}\"",
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inputModifier,
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GetInputArgument(state),
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threads,
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GetMapArgs(state),
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GetVideoArguments(state),
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GetAudioArguments(state),
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state.SegmentLength.ToString(UsCulture),
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startNumberParam,
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state.HlsListSize.ToString(UsCulture),
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outputPath
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).Trim();
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return args;
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}
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/// <summary>
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/// Gets the segment file extension.
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/// </summary>
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/// <param name="state">The state.</param>
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/// <returns>System.String.</returns>
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protected override string GetSegmentFileExtension(StreamState state)
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{
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return ".ts";
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}
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protected override TranscodingJobType TranscodingJobType
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{
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get
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{
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return TranscodingJobType.Hls;
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}
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}
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}
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}
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