548 lines
21 KiB
C#
548 lines
21 KiB
C#
using MediaBrowser.Api.Playback.Hls;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller.Configuration;
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using MediaBrowser.Controller.Devices;
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using MediaBrowser.Controller.Dlna;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Serialization;
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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.Threading;
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using System.Threading.Tasks;
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using MimeTypes = MediaBrowser.Model.Net.MimeTypes;
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namespace MediaBrowser.Api.Playback.Dash
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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.mpd", "GET", Summary = "Gets a video stream using Mpeg dash.")]
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[Route("/Videos/{Id}/master.mpd", "HEAD", Summary = "Gets a video stream using Mpeg dash.")]
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public class GetMasterManifest : VideoStreamRequest
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{
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public bool EnableAdaptiveBitrateStreaming { get; set; }
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public GetMasterManifest()
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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}/dash/{RepresentationId}/{SegmentId}.m4s", "GET")]
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public class GetDashSegment : VideoStreamRequest
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{
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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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/// <summary>
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/// Gets or sets the representation identifier.
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/// </summary>
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/// <value>The representation identifier.</value>
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public string RepresentationId { get; set; }
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}
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public class MpegDashService : BaseHlsService
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{
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public MpegDashService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, IDlnaManager dlnaManager, ISubtitleEncoder subtitleEncoder, IDeviceManager deviceManager, IMediaSourceManager mediaSourceManager, IZipClient zipClient, IJsonSerializer jsonSerializer, INetworkManager networkManager) : base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, dlnaManager, subtitleEncoder, deviceManager, mediaSourceManager, zipClient, jsonSerializer)
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{
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NetworkManager = networkManager;
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}
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protected INetworkManager NetworkManager { get; private set; }
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public object Get(GetMasterManifest 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(GetMasterManifest 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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protected override bool EnableOutputInSubFolder
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{
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get
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{
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return true;
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}
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}
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private async Task<object> GetAsync(GetMasterManifest request, string method)
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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 state = await GetState(request, CancellationToken.None).ConfigureAwait(false);
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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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playlistText = new ManifestBuilder().GetManifestText(state, Request.RawUrl);
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}
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return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.mpd"), new Dictionary<string, string>());
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}
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public object Get(GetDashSegment request)
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{
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return GetDynamicSegment(request, request.SegmentId, request.RepresentationId).Result;
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}
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private async Task<object> GetDynamicSegment(VideoStreamRequest request, string segmentId, string representationId)
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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 requestedIndex = string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase) ?
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-1 :
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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, ".mpd");
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var segmentExtension = GetSegmentFileExtension(state);
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var segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex);
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var segmentLength = state.SegmentLength;
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TranscodingJob job = null;
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if (!string.IsNullOrWhiteSpace(segmentPath))
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{
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job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
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return await GetSegmentResult(playlistPath, segmentPath, requestedIndex, 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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segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex);
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if (!string.IsNullOrWhiteSpace(segmentPath))
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{
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job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
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return await GetSegmentResult(playlistPath, segmentPath, requestedIndex, segmentLength, job, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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if (string.Equals(representationId, "0", StringComparison.OrdinalIgnoreCase))
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{
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job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType);
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var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension);
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var segmentGapRequiringTranscodingChange = 24 / state.SegmentLength;
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Logger.Debug("Current transcoding index is {0}. requestedIndex={1}. segmentGapRequiringTranscodingChange={2}", currentTranscodingIndex ?? -2, requestedIndex, segmentGapRequiringTranscodingChange);
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if (currentTranscodingIndex == null || requestedIndex < currentTranscodingIndex.Value || (requestedIndex - currentTranscodingIndex.Value) > segmentGapRequiringTranscodingChange)
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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(request.DeviceId, request.PlaySessionId, p => false);
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if (currentTranscodingIndex.HasValue)
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{
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DeleteLastTranscodedFiles(playlistPath, 0);
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}
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var positionTicks = GetPositionTicks(state, requestedIndex);
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request.StartTimeTicks = positionTicks;
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var startNumber = GetStartNumber(state);
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var workingDirectory = Path.Combine(Path.GetDirectoryName(playlistPath), (startNumber == -1 ? 0 : startNumber).ToString(CultureInfo.InvariantCulture));
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state.WaitForPath = Path.Combine(workingDirectory, Path.GetFileName(playlistPath));
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FileSystem.CreateDirectory(workingDirectory);
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job = await StartFfMpeg(state, playlistPath, cancellationTokenSource, workingDirectory).ConfigureAwait(false);
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await WaitForMinimumDashSegmentCount(Path.Combine(workingDirectory, Path.GetFileName(playlistPath)), 1, cancellationTokenSource.Token).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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}
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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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while (string.IsNullOrWhiteSpace(segmentPath))
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{
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segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex);
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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, requestedIndex, segmentLength, job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType), cancellationToken).ConfigureAwait(false);
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}
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private long GetPositionTicks(StreamState state, int requestedIndex)
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{
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if (requestedIndex <= 0)
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{
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return 0;
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}
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var startSeconds = requestedIndex * state.SegmentLength;
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return TimeSpan.FromSeconds(startSeconds).Ticks;
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}
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protected Task WaitForMinimumDashSegmentCount(string playlist, int segmentCount, CancellationToken cancellationToken)
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{
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return WaitForSegment(playlist, "stream0-" + segmentCount.ToString("00000", CultureInfo.InvariantCulture) + ".m4s", cancellationToken);
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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 (transcodingJob != null && transcodingJob.HasExited)
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{
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return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob);
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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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public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension)
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{
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var job = ApiEntryPoint.Instance.GetTranscodingJob(playlist, TranscodingJobType);
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if (job == null || job.HasExited)
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{
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return null;
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}
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var file = GetLastTranscodingFiles(playlist, segmentExtension, FileSystem, 1).FirstOrDefault();
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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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return GetIndex(file.FullName);
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}
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public int GetIndex(string segmentPath)
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{
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var indexString = Path.GetFileNameWithoutExtension(segmentPath).Split('-').LastOrDefault();
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if (string.Equals(indexString, "init", StringComparison.OrdinalIgnoreCase))
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{
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return -1;
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}
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var startNumber = int.Parse(Path.GetFileNameWithoutExtension(Path.GetDirectoryName(segmentPath)), NumberStyles.Integer, UsCulture);
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return startNumber + int.Parse(indexString, NumberStyles.Integer, UsCulture) - 1;
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}
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private void DeleteLastTranscodedFiles(string playlistPath, 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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}
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private static List<FileInfo> GetLastTranscodingFiles(string playlist, string segmentExtension, IFileSystem fileSystem, int count)
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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 fileSystem.GetFiles(folder)
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.Where(i => string.Equals(i.Extension, segmentExtension, StringComparison.OrdinalIgnoreCase))
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.OrderByDescending(fileSystem.GetLastWriteTimeUtc)
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.Take(count)
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.ToList();
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}
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catch (DirectoryNotFoundException)
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{
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return new List<FileInfo>();
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}
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}
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private string FindSegment(string playlist, string representationId, string segmentExtension, int requestedIndex)
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{
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var folder = Path.GetDirectoryName(playlist);
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if (requestedIndex == -1)
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{
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var path = Path.Combine(folder, "0", "stream" + representationId + "-" + "init" + segmentExtension);
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return FileSystem.FileExists(path) ? path : null;
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}
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try
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{
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foreach (var subfolder in FileSystem.GetDirectoryPaths(folder).ToList())
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{
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var subfolderName = Path.GetFileNameWithoutExtension(subfolder);
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int startNumber;
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if (int.TryParse(subfolderName, NumberStyles.Any, UsCulture, out startNumber))
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{
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var segmentIndex = requestedIndex - startNumber + 1;
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var path = Path.Combine(folder, subfolderName, "stream" + representationId + "-" + segmentIndex.ToString("00000", CultureInfo.InvariantCulture) + segmentExtension);
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if (FileSystem.FileExists(path))
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{
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return path;
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}
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}
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}
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}
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catch (DirectoryNotFoundException)
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{
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}
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return null;
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}
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protected override string GetAudioArguments(StreamState state)
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{
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var codec = GetAudioEncoder(state);
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if (string.Equals(codec, "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 = GetVideoEncoder(state);
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var args = "-codec:v:0 " + codec;
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if (state.EnableMpegtsM2TsMode)
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{
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args += " -mpegts_m2ts_mode 1";
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}
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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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return state.VideoStream != null && IsH264(state.VideoStream) ?
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args + " -bsf:v h264_mp4toannexb" :
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args;
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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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args += " " + GetVideoQualityParam(state, H264Encoder, 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, false);
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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 += GetGraphicalSubtitleParam(state, codec);
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}
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return args;
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}
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protected override string GetCommandLineArguments(string outputPath, StreamState state, bool isEncoding)
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{
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// test url http://192.168.1.2:8096/videos/233e8905d559a8f230db9bffd2ac9d6d/master.mpd?mediasourceid=233e8905d559a8f230db9bffd2ac9d6d&videocodec=h264&audiocodec=aac&maxwidth=1280&videobitrate=500000&audiobitrate=128000&profile=baseline&level=3
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// Good info on i-frames http://blog.streamroot.io/encode-multi-bitrate-videos-mpeg-dash-mse-based-media-players/
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var threads = GetNumberOfThreads(state, false);
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var inputModifier = GetInputModifier(state);
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var initSegmentName = "stream$RepresentationID$-init.m4s";
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var segmentName = "stream$RepresentationID$-$Number%05d$.m4s";
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var args = string.Format("{0} {1} -map_metadata -1 -threads {2} {3} {4} -copyts {5} -f dash -init_seg_name \"{6}\" -media_seg_name \"{7}\" -use_template 0 -use_timeline 1 -min_seg_duration {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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initSegmentName,
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segmentName,
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(state.SegmentLength * 1000000).ToString(CultureInfo.InvariantCulture),
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state.WaitForPath
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).Trim();
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return args;
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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 GetDashSegment;
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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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if (string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase))
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{
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return -1;
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}
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return int.Parse(segmentId, NumberStyles.Integer, UsCulture);
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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 ".m4s";
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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.Dash;
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}
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}
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private async Task WaitForSegment(string playlist, string segment, CancellationToken cancellationToken)
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{
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var segmentFilename = Path.GetFileName(segment);
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Logger.Debug("Waiting for {0} in {1}", segmentFilename, playlist);
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while (true)
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{
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// Need to use FileShare.ReadWrite because we're reading the file at the same time it's being written
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using (var fileStream = GetPlaylistFileStream(playlist))
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{
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using (var reader = new StreamReader(fileStream))
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{
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while (!reader.EndOfStream)
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{
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var line = await reader.ReadLineAsync().ConfigureAwait(false);
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if (line.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1)
|
|
{
|
|
Logger.Debug("Finished waiting for {0} in {1}", segmentFilename, playlist);
|
|
return;
|
|
}
|
|
}
|
|
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|