353 lines
13 KiB
C#
353 lines
13 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.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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[ApiMember(Name = "BaselineStreamAudioBitRate", Description = "Optional. Specify the audio bitrate for the baseline stream.", IsRequired = false, DataType = "int", ParameterType = "query", Verb = "GET")]
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public int? BaselineStreamAudioBitRate { get; set; }
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[ApiMember(Name = "AppendBaselineStream", Description = "Optional. Whether or not to include a baseline audio-only stream in the master playlist.", IsRequired = false, DataType = "bool", ParameterType = "query", Verb = "GET")]
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public bool AppendBaselineStream { get; set; }
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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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[Route("/Videos/{Id}/baseline.m3u8", "GET")]
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[Api(Description = "Gets a video stream using HTTP live streaming.")]
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public class GetBaselineHlsVideoStream : 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) : 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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if (string.Equals("baseline", request.PlaylistId, StringComparison.OrdinalIgnoreCase))
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{
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return GetDynamicSegment(request, false).Result;
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}
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return GetDynamicSegment(request, true).Result;
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}
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private static readonly SemaphoreSlim FfmpegStartLock = new SemaphoreSlim(1, 1);
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private async Task<object> GetDynamicSegment(GetDynamicHlsVideoSegment request, bool isMain)
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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 GetSegementResult(segmentPath);
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}
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await FfmpegStartLock.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 GetSegementResult(segmentPath);
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}
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else
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{
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if (index == 0)
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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(state.Request.DeviceId, false);
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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, 2, cancellationTokenSource.Token).ConfigureAwait(false);
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}
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}
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}
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finally
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{
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FfmpegStartLock.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 GetSegementResult(segmentPath);
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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 object GetSegementResult(string path)
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{
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// TODO: Handle if it's currently being written to
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return ResultFactory.GetStaticFileResult(Request, path, FileShare.ReadWrite);
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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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int audioBitrate;
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int videoBitrate;
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GetPlaylistBitrates(state, out audioBitrate, out videoBitrate);
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var appendBaselineStream = false;
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var baselineStreamBitrate = 64000;
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var hlsVideoRequest = state.VideoRequest as GetMasterHlsVideoStream;
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if (hlsVideoRequest != null)
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{
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appendBaselineStream = hlsVideoRequest.AppendBaselineStream;
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baselineStreamBitrate = hlsVideoRequest.BaselineStreamAudioBitRate ?? baselineStreamBitrate;
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}
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var playlistText = GetMasterPlaylistFileText(videoBitrate + audioBitrate, appendBaselineStream, baselineStreamBitrate);
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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(int bitrate, bool includeBaselineStream, int baselineStreamBitrate)
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{
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var builder = new StringBuilder();
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builder.AppendLine("#EXTM3U");
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// Pad a little to satisfy the apple hls validator
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var paddedBitrate = Convert.ToInt32(bitrate * 1.05);
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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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builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + paddedBitrate.ToString(UsCulture));
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var playlistUrl = "main.m3u8" + queryString;
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builder.AppendLine(playlistUrl);
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// Low bitrate stream
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if (includeBaselineStream)
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{
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builder.AppendLine("#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=" + baselineStreamBitrate.ToString(UsCulture));
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playlistUrl = "baseline.m3u8" + queryString;
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builder.AppendLine(playlistUrl);
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}
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return builder.ToString();
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}
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public object Get(GetMainHlsVideoStream request)
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{
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var result = GetPlaylistAsync(request, "main").Result;
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return result;
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}
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public object Get(GetBaselineHlsVideoStream request)
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{
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var result = GetPlaylistAsync(request, "baseline").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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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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if (state.AudioStream != null)
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{
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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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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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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 = state.ReadInputAtNativeFramerate ?
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" -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+1))" :
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" -force_key_frames expr:if(isnan(prev_forced_t),gte(t,.1),gte(t,prev_forced_t+5))";
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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 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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}
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}
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