diff options
Diffstat (limited to 'MediaBrowser.Api/Playback/Dash/MpegDashService.cs')
| -rw-r--r-- | MediaBrowser.Api/Playback/Dash/MpegDashService.cs | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/MediaBrowser.Api/Playback/Dash/MpegDashService.cs b/MediaBrowser.Api/Playback/Dash/MpegDashService.cs new file mode 100644 index 000000000..38b0d35d1 --- /dev/null +++ b/MediaBrowser.Api/Playback/Dash/MpegDashService.cs @@ -0,0 +1,561 @@ +using MediaBrowser.Api.Playback.Hls; +using MediaBrowser.Common.IO; +using MediaBrowser.Common.Net; +using MediaBrowser.Controller.Configuration; +using MediaBrowser.Controller.Devices; +using MediaBrowser.Controller.Diagnostics; +using MediaBrowser.Controller.Dlna; +using MediaBrowser.Controller.Library; +using MediaBrowser.Controller.LiveTv; +using MediaBrowser.Controller.MediaEncoding; +using MediaBrowser.Controller.Net; +using MediaBrowser.Model.IO; +using ServiceStack; +using System; +using System.Collections.Generic; +using System.Globalization; +using System.IO; +using System.Linq; +using System.Threading; +using System.Threading.Tasks; +using MimeTypes = MediaBrowser.Model.Net.MimeTypes; + +namespace MediaBrowser.Api.Playback.Dash +{ + /// <summary> + /// Options is needed for chromecast. Threw Head in there since it's related + /// </summary> + [Route("/Videos/{Id}/master.mpd", "GET", Summary = "Gets a video stream using Mpeg dash.")] + [Route("/Videos/{Id}/master.mpd", "HEAD", Summary = "Gets a video stream using Mpeg dash.")] + public class GetMasterManifest : VideoStreamRequest + { + public bool EnableAdaptiveBitrateStreaming { get; set; } + + public GetMasterManifest() + { + EnableAdaptiveBitrateStreaming = true; + } + } + + [Route("/Videos/{Id}/dash/{RepresentationId}/{SegmentId}.m4s", "GET")] + public class GetDashSegment : VideoStreamRequest + { + /// <summary> + /// Gets or sets the segment id. + /// </summary> + /// <value>The segment id.</value> + public string SegmentId { get; set; } + + /// <summary> + /// Gets or sets the representation identifier. + /// </summary> + /// <value>The representation identifier.</value> + public string RepresentationId { get; set; } + } + + public class MpegDashService : BaseHlsService + { + public MpegDashService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, ILiveTvManager liveTvManager, IDlnaManager dlnaManager, ISubtitleEncoder subtitleEncoder, IDeviceManager deviceManager, IProcessManager processManager, IMediaSourceManager mediaSourceManager, IZipClient zipClient, INetworkManager networkManager) + : base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, liveTvManager, dlnaManager, subtitleEncoder, deviceManager, processManager, mediaSourceManager, zipClient) + { + NetworkManager = networkManager; + } + + protected INetworkManager NetworkManager { get; private set; } + + public object Get(GetMasterManifest request) + { + var result = GetAsync(request, "GET").Result; + + return result; + } + + public object Head(GetMasterManifest request) + { + var result = GetAsync(request, "HEAD").Result; + + return result; + } + + protected override bool EnableOutputInSubFolder + { + get + { + return true; + } + } + + private async Task<object> GetAsync(GetMasterManifest request, string method) + { + if (string.IsNullOrEmpty(request.MediaSourceId)) + { + throw new ArgumentException("MediaSourceId is required"); + } + + var state = await GetState(request, CancellationToken.None).ConfigureAwait(false); + + var playlistText = string.Empty; + + if (string.Equals(method, "GET", StringComparison.OrdinalIgnoreCase)) + { + playlistText = new ManifestBuilder().GetManifestText(state, Request.RawUrl); + } + + return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.mpd"), new Dictionary<string, string>()); + } + + public object Get(GetDashSegment request) + { + return GetDynamicSegment(request, request.SegmentId, request.RepresentationId).Result; + } + + private async Task<object> GetDynamicSegment(VideoStreamRequest request, string segmentId, string representationId) + { + if ((request.StartTimeTicks ?? 0) > 0) + { + throw new ArgumentException("StartTimeTicks is not allowed."); + } + + var cancellationTokenSource = new CancellationTokenSource(); + var cancellationToken = cancellationTokenSource.Token; + + var requestedIndex = string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase) ? + -1 : + int.Parse(segmentId, NumberStyles.Integer, UsCulture); + + var state = await GetState(request, cancellationToken).ConfigureAwait(false); + + var playlistPath = Path.ChangeExtension(state.OutputFilePath, ".mpd"); + + var segmentExtension = GetSegmentFileExtension(state); + + var segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex); + var segmentLength = state.SegmentLength; + + TranscodingJob job = null; + + if (!string.IsNullOrWhiteSpace(segmentPath)) + { + job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType); + return await GetSegmentResult(playlistPath, segmentPath, requestedIndex, segmentLength, job, cancellationToken).ConfigureAwait(false); + } + + await ApiEntryPoint.Instance.TranscodingStartLock.WaitAsync(cancellationTokenSource.Token).ConfigureAwait(false); + try + { + segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex); + if (!string.IsNullOrWhiteSpace(segmentPath)) + { + job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType); + return await GetSegmentResult(playlistPath, segmentPath, requestedIndex, segmentLength, job, cancellationToken).ConfigureAwait(false); + } + else + { + if (string.Equals(representationId, "0", StringComparison.OrdinalIgnoreCase)) + { + job = ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType); + var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension); + var segmentGapRequiringTranscodingChange = 24 / state.SegmentLength; + Logger.Debug("Current transcoding index is {0}. requestedIndex={1}. segmentGapRequiringTranscodingChange={2}", currentTranscodingIndex ?? -2, requestedIndex, segmentGapRequiringTranscodingChange); + if (currentTranscodingIndex == null || requestedIndex < currentTranscodingIndex.Value || (requestedIndex - currentTranscodingIndex.Value) > segmentGapRequiringTranscodingChange) + { + // If the playlist doesn't already exist, startup ffmpeg + try + { + ApiEntryPoint.Instance.KillTranscodingJobs(request.DeviceId, request.StreamId, p => false); + + if (currentTranscodingIndex.HasValue) + { + DeleteLastTranscodedFiles(playlistPath, 0); + } + + var positionTicks = GetPositionTicks(state, requestedIndex); + request.StartTimeTicks = positionTicks; + + var startNumber = GetStartNumber(state); + + var workingDirectory = Path.Combine(Path.GetDirectoryName(playlistPath), (startNumber == -1 ? 0 : startNumber).ToString(CultureInfo.InvariantCulture)); + state.WaitForPath = Path.Combine(workingDirectory, Path.GetFileName(playlistPath)); + Directory.CreateDirectory(workingDirectory); + job = await StartFfMpeg(state, playlistPath, cancellationTokenSource, workingDirectory).ConfigureAwait(false); + await WaitForMinimumDashSegmentCount(Path.Combine(workingDirectory, Path.GetFileName(playlistPath)), 1, cancellationTokenSource.Token).ConfigureAwait(false); + } + catch + { + state.Dispose(); + throw; + } + } + } + } + } + finally + { + ApiEntryPoint.Instance.TranscodingStartLock.Release(); + } + + while (string.IsNullOrWhiteSpace(segmentPath)) + { + segmentPath = FindSegment(playlistPath, representationId, segmentExtension, requestedIndex); + await Task.Delay(50, cancellationToken).ConfigureAwait(false); + } + + Logger.Info("returning {0}", segmentPath); + return await GetSegmentResult(playlistPath, segmentPath, requestedIndex, segmentLength, job ?? ApiEntryPoint.Instance.GetTranscodingJob(playlistPath, TranscodingJobType), cancellationToken).ConfigureAwait(false); + } + + private long GetPositionTicks(StreamState state, int requestedIndex) + { + if (requestedIndex <= 0) + { + return 0; + } + + var startSeconds = requestedIndex * state.SegmentLength; + return TimeSpan.FromSeconds(startSeconds).Ticks; + } + + protected Task WaitForMinimumDashSegmentCount(string playlist, int segmentCount, CancellationToken cancellationToken) + { + return WaitForSegment(playlist, "stream0-" + segmentCount.ToString("00000", CultureInfo.InvariantCulture) + ".m4s", cancellationToken); + } + + private async Task<object> GetSegmentResult(string playlistPath, + string segmentPath, + int segmentIndex, + int segmentLength, + TranscodingJob transcodingJob, + CancellationToken cancellationToken) + { + // If all transcoding has completed, just return immediately + if (transcodingJob != null && transcodingJob.HasExited) + { + return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob); + } + + // Wait for the file to stop being written to, then stream it + var length = new FileInfo(segmentPath).Length; + var eofCount = 0; + + while (eofCount < 10) + { + var info = new FileInfo(segmentPath); + + if (!info.Exists) + { + break; + } + + var newLength = info.Length; + + if (newLength == length) + { + eofCount++; + } + else + { + eofCount = 0; + } + + length = newLength; + await Task.Delay(100, cancellationToken).ConfigureAwait(false); + } + + return GetSegmentResult(segmentPath, segmentIndex, segmentLength, transcodingJob); + } + + private object GetSegmentResult(string segmentPath, int index, int segmentLength, TranscodingJob transcodingJob) + { + var segmentEndingSeconds = (1 + index) * segmentLength; + var segmentEndingPositionTicks = TimeSpan.FromSeconds(segmentEndingSeconds).Ticks; + + return ResultFactory.GetStaticFileResult(Request, new StaticFileResultOptions + { + Path = segmentPath, + FileShare = FileShare.ReadWrite, + OnComplete = () => + { + if (transcodingJob != null) + { + transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks); + } + + } + }); + } + + public int? GetCurrentTranscodingIndex(string playlist, string segmentExtension) + { + var job = ApiEntryPoint.Instance.GetTranscodingJob(playlist, TranscodingJobType); + + if (job == null || job.HasExited) + { + return null; + } + + var file = GetLastTranscodingFiles(playlist, segmentExtension, FileSystem, 1).FirstOrDefault(); + + if (file == null) + { + return null; + } + + return GetIndex(file.FullName); + } + + public int GetIndex(string segmentPath) + { + var indexString = Path.GetFileNameWithoutExtension(segmentPath).Split('-').LastOrDefault(); + + if (string.Equals(indexString, "init", StringComparison.OrdinalIgnoreCase)) + { + return -1; + } + var startNumber = int.Parse(Path.GetFileNameWithoutExtension(Path.GetDirectoryName(segmentPath)), NumberStyles.Integer, UsCulture); + + return startNumber + int.Parse(indexString, NumberStyles.Integer, UsCulture) - 1; + } + + private void DeleteLastTranscodedFiles(string playlistPath, int retryCount) + { + if (retryCount >= 5) + { + return; + } + } + + private static List<FileInfo> GetLastTranscodingFiles(string playlist, string segmentExtension, IFileSystem fileSystem, int count) + { + var folder = Path.GetDirectoryName(playlist); + + try + { + return new DirectoryInfo(folder) + .EnumerateFiles("*", SearchOption.AllDirectories) + .Where(i => string.Equals(i.Extension, segmentExtension, StringComparison.OrdinalIgnoreCase)) + .OrderByDescending(fileSystem.GetLastWriteTimeUtc) + .Take(count) + .ToList(); + } + catch (DirectoryNotFoundException) + { + return new List<FileInfo>(); + } + } + + private string FindSegment(string playlist, string representationId, string segmentExtension, int requestedIndex) + { + var folder = Path.GetDirectoryName(playlist); + + if (requestedIndex == -1) + { + var path = Path.Combine(folder, "0", "stream" + representationId + "-" + "init" + segmentExtension); + return File.Exists(path) ? path : null; + } + + try + { + foreach (var subfolder in new DirectoryInfo(folder).EnumerateDirectories().ToList()) + { + var subfolderName = Path.GetFileNameWithoutExtension(subfolder.FullName); + int startNumber; + if (int.TryParse(subfolderName, NumberStyles.Any, UsCulture, out startNumber)) + { + var segmentIndex = requestedIndex - startNumber + 1; + var path = Path.Combine(folder, subfolderName, "stream" + representationId + "-" + segmentIndex.ToString("00000", CultureInfo.InvariantCulture) + segmentExtension); + if (File.Exists(path)) + { + return path; + } + } + } + } + catch (DirectoryNotFoundException) + { + + } + + return null; + } + + 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; + + var args = "-codec:v:0 " + codec; + + if (state.EnableMpegtsM2TsMode) + { + args += " -mpegts_m2ts_mode 1"; + } + + // See if we can save come cpu cycles by avoiding encoding + if (codec.Equals("copy", StringComparison.OrdinalIgnoreCase)) + { + return state.VideoStream != null && IsH264(state.VideoStream) ? + args + " -bsf:v h264_mp4toannexb" : + args; + } + + 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; + + args += " " + GetVideoQualityParam(state, H264Encoder, 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) + { + // 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 + // Good info on i-frames http://blog.streamroot.io/encode-multi-bitrate-videos-mpeg-dash-mse-based-media-players/ + + var threads = GetNumberOfThreads(state, false); + + var inputModifier = GetInputModifier(state); + + var initSegmentName = "stream$RepresentationID$-init.m4s"; + var segmentName = "stream$RepresentationID$-$Number%05d$.m4s"; + + 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}\"", + inputModifier, + GetInputArgument(transcodingJobId, state), + threads, + GetMapArgs(state), + GetVideoArguments(state), + GetAudioArguments(state), + initSegmentName, + segmentName, + (state.SegmentLength * 1000000).ToString(CultureInfo.InvariantCulture), + state.WaitForPath + ).Trim(); + + return args; + } + + protected override int GetStartNumber(StreamState state) + { + return GetStartNumber(state.VideoRequest); + } + + private int GetStartNumber(VideoStreamRequest request) + { + var segmentId = "0"; + + var segmentRequest = request as GetDashSegment; + if (segmentRequest != null) + { + segmentId = segmentRequest.SegmentId; + } + + if (string.Equals(segmentId, "init", StringComparison.OrdinalIgnoreCase)) + { + return -1; + } + + return int.Parse(segmentId, NumberStyles.Integer, UsCulture); + } + + /// <summary> + /// Gets the segment file extension. + /// </summary> + /// <param name="state">The state.</param> + /// <returns>System.String.</returns> + protected override string GetSegmentFileExtension(StreamState state) + { + return ".m4s"; + } + + protected override TranscodingJobType TranscodingJobType + { + get + { + return TranscodingJobType.Dash; + } + } + + private async Task WaitForSegment(string playlist, string segment, CancellationToken cancellationToken) + { + var tmpPath = playlist + ".tmp"; + + var segmentFilename = Path.GetFileName(segment); + + Logger.Debug("Waiting for {0} in {1}", segmentFilename, playlist); + + while (true) + { + FileStream fileStream; + try + { + fileStream = FileSystem.GetFileStream(tmpPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true); + } + catch (IOException) + { + fileStream = FileSystem.GetFileStream(playlist, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true); + } + // Need to use FileShare.ReadWrite because we're reading the file at the same time it's being written + using (fileStream) + { + using (var reader = new StreamReader(fileStream)) + { + while (!reader.EndOfStream) + { + var line = await reader.ReadLineAsync().ConfigureAwait(false); + + 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); + } + } + } + } + } +} |