358 lines
14 KiB
C#
358 lines
14 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using CommonIO;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Common.Net;
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using MediaBrowser.Controller;
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using MediaBrowser.Controller.MediaEncoding;
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using MediaBrowser.Model.Dto;
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using MediaBrowser.Model.Entities;
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using MediaBrowser.Model.LiveTv;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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namespace MediaBrowser.Server.Implementations.LiveTv.EmbyTV
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{
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public class EncodedRecorder : IRecorder
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{
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private readonly ILogger _logger;
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private readonly IFileSystem _fileSystem;
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private readonly IHttpClient _httpClient;
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private readonly IMediaEncoder _mediaEncoder;
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private readonly IServerApplicationPaths _appPaths;
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private readonly LiveTvOptions _liveTvOptions;
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private bool _hasExited;
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private Stream _logFileStream;
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private string _targetPath;
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private Process _process;
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private readonly IJsonSerializer _json;
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private readonly TaskCompletionSource<bool> _taskCompletionSource = new TaskCompletionSource<bool>();
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public EncodedRecorder(ILogger logger, IFileSystem fileSystem, IMediaEncoder mediaEncoder, IServerApplicationPaths appPaths, IJsonSerializer json, LiveTvOptions liveTvOptions, IHttpClient httpClient)
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{
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_logger = logger;
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_fileSystem = fileSystem;
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_mediaEncoder = mediaEncoder;
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_appPaths = appPaths;
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_json = json;
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_liveTvOptions = liveTvOptions;
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_httpClient = httpClient;
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}
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public string GetOutputPath(MediaSourceInfo mediaSource, string targetFile)
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{
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return Path.ChangeExtension(targetFile, ".mp4");
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}
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public async Task Record(MediaSourceInfo mediaSource, string targetFile, TimeSpan duration, Action onStarted, CancellationToken cancellationToken)
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{
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var tempfile = Path.Combine(_appPaths.TranscodingTempPath, Guid.NewGuid().ToString("N") + ".ts");
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try
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{
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await RecordInternal(mediaSource, tempfile, targetFile, duration, onStarted, cancellationToken)
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.ConfigureAwait(false);
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}
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finally
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{
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try
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{
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File.Delete(tempfile);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error deleting recording temp file", ex);
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}
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}
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}
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public async Task RecordInternal(MediaSourceInfo mediaSource, string tempFile, string targetFile, TimeSpan duration, Action onStarted, CancellationToken cancellationToken)
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{
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var httpRequestOptions = new HttpRequestOptions()
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{
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Url = mediaSource.Path
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};
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httpRequestOptions.BufferContent = false;
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using (var response = await _httpClient.SendAsync(httpRequestOptions, "GET").ConfigureAwait(false))
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{
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_logger.Info("Opened recording stream from tuner provider");
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Directory.CreateDirectory(Path.GetDirectoryName(tempFile));
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using (var output = _fileSystem.GetFileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.Read))
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{
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//onStarted();
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_logger.Info("Copying recording stream to file {0}", tempFile);
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var bufferMs = 5000;
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if (mediaSource.RunTimeTicks.HasValue)
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{
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// The media source already has a fixed duration
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// But add another stop 1 minute later just in case the recording gets stuck for any reason
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var durationToken = new CancellationTokenSource(duration.Add(TimeSpan.FromMinutes(1)));
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cancellationToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, durationToken.Token).Token;
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}
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else
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{
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// The media source if infinite so we need to handle stopping ourselves
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var durationToken = new CancellationTokenSource(duration.Add(TimeSpan.FromMilliseconds(bufferMs)));
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cancellationToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, durationToken.Token).Token;
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}
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var tempFileTask = response.Content.CopyToAsync(output, StreamDefaults.DefaultCopyToBufferSize, cancellationToken);
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// Give the temp file a little time to build up
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await Task.Delay(bufferMs, cancellationToken).ConfigureAwait(false);
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var recordTask = Task.Run(() => RecordFromFile(mediaSource, tempFile, targetFile, duration, onStarted, cancellationToken), cancellationToken);
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await tempFileTask.ConfigureAwait(false);
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await recordTask.ConfigureAwait(false);
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}
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}
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_logger.Info("Recording completed to file {0}", targetFile);
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}
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private Task RecordFromFile(MediaSourceInfo mediaSource, string inputFile, string targetFile, TimeSpan duration, Action onStarted, CancellationToken cancellationToken)
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{
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_targetPath = targetFile;
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_fileSystem.CreateDirectory(Path.GetDirectoryName(targetFile));
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var process = new Process
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{
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StartInfo = new ProcessStartInfo
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{
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CreateNoWindow = true,
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UseShellExecute = false,
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// Must consume both stdout and stderr or deadlocks may occur
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RedirectStandardOutput = true,
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RedirectStandardError = true,
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RedirectStandardInput = true,
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FileName = _mediaEncoder.EncoderPath,
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Arguments = GetCommandLineArgs(mediaSource, inputFile, targetFile, duration),
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WindowStyle = ProcessWindowStyle.Hidden,
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ErrorDialog = false
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},
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EnableRaisingEvents = true
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};
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_process = process;
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var commandLineLogMessage = process.StartInfo.FileName + " " + process.StartInfo.Arguments;
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_logger.Info(commandLineLogMessage);
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var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "record-transcode-" + Guid.NewGuid() + ".txt");
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_fileSystem.CreateDirectory(Path.GetDirectoryName(logFilePath));
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// FFMpeg writes debug/error info to stderr. This is useful when debugging so let's put it in the log directory.
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_logFileStream = _fileSystem.GetFileStream(logFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, true);
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var commandLineLogMessageBytes = Encoding.UTF8.GetBytes(_json.SerializeToString(mediaSource) + Environment.NewLine + Environment.NewLine + commandLineLogMessage + Environment.NewLine + Environment.NewLine);
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_logFileStream.Write(commandLineLogMessageBytes, 0, commandLineLogMessageBytes.Length);
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process.Exited += (sender, args) => OnFfMpegProcessExited(process);
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process.Start();
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cancellationToken.Register(Stop);
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// MUST read both stdout and stderr asynchronously or a deadlock may occurr
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process.BeginOutputReadLine();
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onStarted();
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// Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
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StartStreamingLog(process.StandardError.BaseStream, _logFileStream);
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return _taskCompletionSource.Task;
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}
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private string GetCommandLineArgs(MediaSourceInfo mediaSource, string inputTempFile, string targetFile, TimeSpan duration)
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{
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string videoArgs;
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if (EncodeVideo(mediaSource))
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{
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var maxBitrate = 25000000;
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videoArgs = string.Format(
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"-codec:v:0 libx264 -force_key_frames expr:gte(t,n_forced*5) {0} -pix_fmt yuv420p -preset superfast -crf 23 -b:v {1} -maxrate {1} -bufsize ({1}*2) -vsync -1 -profile:v high -level 41",
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GetOutputSizeParam(),
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maxBitrate.ToString(CultureInfo.InvariantCulture));
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}
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else
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{
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videoArgs = "-codec:v:0 copy";
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}
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var durationParam = " -t " + _mediaEncoder.GetTimeParameter(duration.Ticks);
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var commandLineArgs = "-fflags +genpts -async 1 -vsync -1 -re -i \"{0}\"{4} -sn {2} -map_metadata -1 -threads 0 {3} -y \"{1}\"";
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if (mediaSource.ReadAtNativeFramerate)
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{
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commandLineArgs = "-re " + commandLineArgs;
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}
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commandLineArgs = string.Format(commandLineArgs, inputTempFile, targetFile, videoArgs, GetAudioArgs(mediaSource), durationParam);
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return commandLineArgs;
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}
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private string GetAudioArgs(MediaSourceInfo mediaSource)
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{
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// do not copy aac because many players have difficulty with aac_latm
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var copyAudio = new[] { "mp3" };
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var mediaStreams = mediaSource.MediaStreams ?? new List<MediaStream>();
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var inputAudioCodec = mediaStreams.Where(i => i.Type == MediaStreamType.Audio).Select(i => i.Codec).FirstOrDefault() ?? string.Empty;
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if (copyAudio.Contains(inputAudioCodec, StringComparer.OrdinalIgnoreCase))
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{
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return "-codec:a:0 copy";
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}
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if (_liveTvOptions.EnableOriginalAudioWithEncodedRecordings && !string.Equals(inputAudioCodec, "aac", StringComparison.OrdinalIgnoreCase))
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{
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return "-codec:a:0 copy";
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}
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var audioChannels = 2;
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var audioStream = mediaStreams.FirstOrDefault(i => i.Type == MediaStreamType.Audio);
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if (audioStream != null)
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{
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audioChannels = audioStream.Channels ?? audioChannels;
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}
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return "-codec:a:0 aac -strict experimental -ab 320000";
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}
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private bool EncodeVideo(MediaSourceInfo mediaSource)
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{
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var mediaStreams = mediaSource.MediaStreams ?? new List<MediaStream>();
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return !mediaStreams.Any(i => i.Type == MediaStreamType.Video && string.Equals(i.Codec, "h264", StringComparison.OrdinalIgnoreCase) && !i.IsInterlaced);
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}
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protected string GetOutputSizeParam()
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{
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var filters = new List<string>();
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filters.Add("yadif=0:-1:0");
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var output = string.Empty;
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if (filters.Count > 0)
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{
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output += string.Format(" -vf \"{0}\"", string.Join(",", filters.ToArray()));
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}
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return output;
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}
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private void Stop()
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{
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if (!_hasExited)
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{
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try
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{
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_logger.Info("Killing ffmpeg recording process for {0}", _targetPath);
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//process.Kill();
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_process.StandardInput.WriteLine("q");
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error killing transcoding job for {0}", ex, _targetPath);
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}
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}
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}
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/// <summary>
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/// Processes the exited.
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/// </summary>
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/// <param name="process">The process.</param>
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private void OnFfMpegProcessExited(Process process)
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{
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_hasExited = true;
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DisposeLogStream();
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try
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{
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var exitCode = process.ExitCode;
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_logger.Info("FFMpeg recording exited with code {0} for {1}", exitCode, _targetPath);
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if (exitCode == 0)
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{
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_taskCompletionSource.TrySetResult(true);
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}
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else
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{
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_taskCompletionSource.TrySetException(new Exception(string.Format("Recording for {0} failed. Exit code {1}", _targetPath, exitCode)));
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}
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}
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catch
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{
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_logger.Error("FFMpeg recording exited with an error for {0}.", _targetPath);
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_taskCompletionSource.TrySetException(new Exception(string.Format("Recording for {0} failed", _targetPath)));
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}
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}
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private void DisposeLogStream()
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{
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if (_logFileStream != null)
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{
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try
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{
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_logFileStream.Dispose();
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error disposing recording log stream", ex);
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}
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_logFileStream = null;
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}
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}
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private async void StartStreamingLog(Stream source, Stream target)
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{
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try
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{
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using (var reader = new StreamReader(source))
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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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var bytes = Encoding.UTF8.GetBytes(Environment.NewLine + line);
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await target.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
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await target.FlushAsync().ConfigureAwait(false);
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}
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}
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}
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catch (ObjectDisposedException)
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{
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// Don't spam the log. This doesn't seem to throw in windows, but sometimes under linux
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error reading ffmpeg recording log", ex);
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}
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}
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}
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}
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