314 lines
12 KiB
C#
314 lines
12 KiB
C#
using MediaBrowser.Common.IO;
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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.Model.Extensions;
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using MediaBrowser.Model.IO;
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using MediaBrowser.Model.Net;
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using System;
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using System.Collections.Generic;
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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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using MediaBrowser.Model.Serialization;
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namespace MediaBrowser.Api.Playback.Hls
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{
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/// <summary>
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/// Class BaseHlsService
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/// </summary>
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public abstract class BaseHlsService : BaseStreamingService
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{
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protected BaseHlsService(IServerConfigurationManager serverConfig, IUserManager userManager, ILibraryManager libraryManager, IIsoManager isoManager, IMediaEncoder mediaEncoder, IFileSystem fileSystem, IDlnaManager dlnaManager, ISubtitleEncoder subtitleEncoder, IDeviceManager deviceManager, IMediaSourceManager mediaSourceManager, IZipClient zipClient, IJsonSerializer jsonSerializer) : base(serverConfig, userManager, libraryManager, isoManager, mediaEncoder, fileSystem, dlnaManager, subtitleEncoder, deviceManager, mediaSourceManager, zipClient, jsonSerializer)
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{
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}
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/// <summary>
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/// Gets the audio arguments.
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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 abstract string GetAudioArguments(StreamState state);
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/// <summary>
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/// Gets the video arguments.
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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 abstract string GetVideoArguments(StreamState state);
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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 abstract string GetSegmentFileExtension(StreamState state);
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/// <summary>
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/// Gets the type of the transcoding job.
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/// </summary>
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/// <value>The type of the transcoding job.</value>
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protected override TranscodingJobType TranscodingJobType
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{
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get { return TranscodingJobType.Hls; }
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}
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/// <summary>
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/// Processes the request.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <param name="isLive">if set to <c>true</c> [is live].</param>
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/// <returns>System.Object.</returns>
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protected object ProcessRequest(StreamRequest request, bool isLive)
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{
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return ProcessRequestAsync(request, isLive).Result;
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}
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/// <summary>
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/// Processes the request async.
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/// </summary>
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/// <param name="request">The request.</param>
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/// <param name="isLive">if set to <c>true</c> [is live].</param>
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/// <returns>Task{System.Object}.</returns>
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/// <exception cref="ArgumentException">A video bitrate is required
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/// or
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/// An audio bitrate is required</exception>
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private async Task<object> ProcessRequestAsync(StreamRequest request, bool isLive)
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{
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var cancellationTokenSource = new CancellationTokenSource();
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var state = await GetState(request, cancellationTokenSource.Token).ConfigureAwait(false);
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if (isLive)
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{
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state.Request.StartTimeTicks = null;
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}
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TranscodingJob job = null;
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var playlist = state.OutputFilePath;
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if (!File.Exists(playlist))
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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(playlist))
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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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job = await StartFfMpeg(state, playlist, 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(playlist, 3, cancellationTokenSource.Token).ConfigureAwait(false);
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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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}
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if (isLive)
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{
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job = job ?? ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlist, TranscodingJobType);
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if (job != null)
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{
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ApiEntryPoint.Instance.OnTranscodeEndRequest(job);
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}
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return ResultFactory.GetResult(GetLivePlaylistText(playlist, state.SegmentLength), MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
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}
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var audioBitrate = state.OutputAudioBitrate ?? 0;
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var videoBitrate = state.OutputVideoBitrate ?? 0;
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var appendBaselineStream = false;
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var baselineStreamBitrate = 64000;
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var hlsVideoRequest = state.VideoRequest as GetHlsVideoStream;
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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(playlist, videoBitrate + audioBitrate, appendBaselineStream, baselineStreamBitrate);
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job = job ?? ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlist, TranscodingJobType);
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if (job != null)
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{
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ApiEntryPoint.Instance.OnTranscodeEndRequest(job);
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}
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return ResultFactory.GetResult(playlistText, MimeTypes.GetMimeType("playlist.m3u8"), new Dictionary<string, string>());
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}
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private string GetLivePlaylistText(string path, int segmentLength)
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{
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using (var stream = FileSystem.GetFileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
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{
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using (var reader = new StreamReader(stream))
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{
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var text = reader.ReadToEnd();
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var newDuration = "#EXT-X-TARGETDURATION:" + segmentLength.ToString(UsCulture);
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// ffmpeg pads the reported length by a full second
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text = text.Replace("#EXT-X-TARGETDURATION:" + (segmentLength + 1).ToString(UsCulture), newDuration, StringComparison.OrdinalIgnoreCase);
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return text;
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}
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}
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}
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private string GetMasterPlaylistFileText(string firstPlaylist, 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 * 1.15);
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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 = "hls/" + Path.GetFileName(firstPlaylist).Replace(".m3u8", "/stream.m3u8");
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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 = "hls/" + Path.GetFileName(firstPlaylist).Replace(".m3u8", "-low/stream.m3u8");
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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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protected virtual async Task WaitForMinimumSegmentCount(string playlist, int segmentCount, CancellationToken cancellationToken)
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{
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Logger.Debug("Waiting for {0} segments in {1}", segmentCount, 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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var count = 0;
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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("#EXTINF:", StringComparison.OrdinalIgnoreCase) != -1)
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{
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count++;
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if (count >= segmentCount)
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{
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Logger.Debug("Finished waiting for {0} segments in {1}", segmentCount, playlist);
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return;
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}
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}
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}
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await Task.Delay(100, cancellationToken).ConfigureAwait(false);
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}
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}
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}
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}
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protected Stream GetPlaylistFileStream(string path)
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{
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var tmpPath = path + ".tmp";
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try
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{
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return FileSystem.GetFileStream(tmpPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true);
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}
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catch (IOException)
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{
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return FileSystem.GetFileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, true);
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}
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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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var hlsVideoRequest = state.VideoRequest as GetHlsVideoStream;
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var itsOffsetMs = hlsVideoRequest == null
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? 0
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: hlsVideoRequest.TimeStampOffsetMs;
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var itsOffset = itsOffsetMs == 0 ? string.Empty : string.Format("-itsoffset {0} ", TimeSpan.FromMilliseconds(itsOffsetMs).TotalSeconds.ToString(UsCulture));
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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 baseUrlParam = string.Empty;
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if (state.Request is GetLiveHlsStream)
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{
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baseUrlParam = string.Format(" -hls_base_url \"{0}/\"",
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"hls/" + Path.GetFileNameWithoutExtension(outputPath));
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}
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var args = string.Format("{0} {1} {2} -map_metadata -1 -threads {3} {4} {5} -sc_threshold 0 {6} -hls_time {7} -start_number {8} -hls_list_size {9}{10} -y \"{11}\"",
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itsOffset,
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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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baseUrlParam,
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outputPath
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).Trim();
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if (hlsVideoRequest != null)
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{
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if (hlsVideoRequest.AppendBaselineStream)
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{
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var lowBitratePath = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath) + "-low.m3u8");
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var bitrate = hlsVideoRequest.BaselineStreamAudioBitRate ?? 64000;
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var lowBitrateParams = string.Format(" -threads {0} -vn -codec:a:0 libmp3lame -ac 2 -ab {1} -hls_time {2} -start_number {3} -hls_list_size {4} -y \"{5}\"",
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threads,
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bitrate / 2,
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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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lowBitratePath);
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args += " " + lowBitrateParams;
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}
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}
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return args;
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}
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protected virtual int GetStartNumber(StreamState state)
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{
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return 0;
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}
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}
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}
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