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using MediaBrowser.Common.Configuration;
using MediaBrowser.Common.IO;
using MediaBrowser.Controller.LiveTv;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Logging;
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.MediaEncoding.Encoder
{
public class FFMpegProcess : IDisposable
{
private readonly string _ffmpegPath;
private readonly ILogger _logger;
private readonly IFileSystem _fileSystem;
private readonly IApplicationPaths _appPaths;
private readonly IIsoManager _isoManager;
private readonly ILiveTvManager _liveTvManager;
private Stream _logFileStream;
private InternalEncodingTask _task;
private IIsoMount _isoMount;
public FFMpegProcess(string ffmpegPath, ILogger logger, IFileSystem fileSystem, IApplicationPaths appPaths, IIsoManager isoManager, ILiveTvManager liveTvManager)
{
_ffmpegPath = ffmpegPath;
_logger = logger;
_fileSystem = fileSystem;
_appPaths = appPaths;
_isoManager = isoManager;
_liveTvManager = liveTvManager;
}
public async Task Start(InternalEncodingTask task, Func<InternalEncodingTask,string,string> argumentsFactory)
{
_task = task;
if (!File.Exists(_ffmpegPath))
{
throw new InvalidOperationException("ffmpeg was not found at " + _ffmpegPath);
}
Directory.CreateDirectory(Path.GetDirectoryName(task.Request.OutputPath));
string mountedPath = null;
if (task.InputVideoType.HasValue && task.InputVideoType == VideoType.Iso && task.IsoType.HasValue)
{
if (_isoManager.CanMount(task.MediaPath))
{
_isoMount = await _isoManager.Mount(task.MediaPath, CancellationToken.None).ConfigureAwait(false);
mountedPath = _isoMount.MountedPath;
}
}
var process = new Process
{
StartInfo = new ProcessStartInfo
{
CreateNoWindow = true,
UseShellExecute = false,
// Must consume both stdout and stderr or deadlocks may occur
RedirectStandardOutput = true,
RedirectStandardError = true,
FileName = _ffmpegPath,
WorkingDirectory = Path.GetDirectoryName(_ffmpegPath),
Arguments = argumentsFactory(task, mountedPath),
WindowStyle = ProcessWindowStyle.Hidden,
ErrorDialog = false
},
EnableRaisingEvents = true
};
_logger.Info(process.StartInfo.FileName + " " + process.StartInfo.Arguments);
var logFilePath = Path.Combine(_appPaths.LogDirectoryPath, "ffmpeg-" + task.Id + ".txt");
Directory.CreateDirectory(Path.GetDirectoryName(logFilePath));
// FFMpeg writes debug/error info to stderr. This is useful when debugging so let's put it in the log directory.
_logFileStream = _fileSystem.GetFileStream(logFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, true);
process.Exited += process_Exited;
try
{
process.Start();
}
catch (Exception ex)
{
_logger.ErrorException("Error starting ffmpeg", ex);
task.OnError();
DisposeLogFileStream();
process.Dispose();
throw;
}
task.OnBegin();
// MUST read both stdout and stderr asynchronously or a deadlock may occurr
process.BeginOutputReadLine();
#pragma warning disable 4014
// Important - don't await the log task or we won't be able to kill ffmpeg when the user stops playback
process.StandardError.BaseStream.CopyToAsync(_logFileStream);
#pragma warning restore 4014
}
async void process_Exited(object sender, EventArgs e)
{
var process = (Process)sender;
if (_isoMount != null)
{
_isoMount.Dispose();
_isoMount = null;
}
DisposeLogFileStream();
try
{
_logger.Info("FFMpeg exited with code {0} for {1}", process.ExitCode, _task.Request.OutputPath);
}
catch
{
_logger.Info("FFMpeg exited with an error for {0}", _task.Request.OutputPath);
}
_task.OnCompleted();
if (!string.IsNullOrEmpty(_task.LiveTvStreamId))
{
try
{
await _liveTvManager.CloseLiveStream(_task.LiveTvStreamId, CancellationToken.None).ConfigureAwait(false);
}
catch (Exception ex)
{
_logger.ErrorException("Error closing live tv stream", ex);
}
}
}
public void Dispose()
{
DisposeLogFileStream();
}
private void DisposeLogFileStream()
{
if (_logFileStream != null)
{
_logFileStream.Dispose();
_logFileStream = null;
}
}
}
}
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