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172 lines
5 KiB
C#
172 lines
5 KiB
C#
using MediaBrowser.Common.Configuration;
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using MediaBrowser.Model.Configuration;
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using MediaBrowser.Model.Logging;
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using System;
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using System.IO;
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using System.Threading;
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namespace MediaBrowser.Api.Playback
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{
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public class TranscodingThrottler : IDisposable
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{
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private readonly TranscodingJob _job;
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private readonly ILogger _logger;
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private Timer _timer;
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private bool _isPaused;
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private readonly IConfigurationManager _config;
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public TranscodingThrottler(TranscodingJob job, ILogger logger, IConfigurationManager config)
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{
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_job = job;
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_logger = logger;
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_config = config;
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}
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private EncodingOptions GetOptions()
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{
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return _config.GetConfiguration<EncodingOptions>("encoding");
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}
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public void Start()
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{
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_timer = new Timer(TimerCallback, null, 5000, 5000);
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}
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private void TimerCallback(object state)
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{
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if (_job.HasExited)
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{
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DisposeTimer();
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return;
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}
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var options = GetOptions();
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if (options.EnableThrottling && IsThrottleAllowed(_job, options.ThrottleDelaySeconds))
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{
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PauseTranscoding();
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}
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else
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{
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UnpauseTranscoding();
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}
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}
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private void PauseTranscoding()
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{
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if (!_isPaused)
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{
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_logger.Debug("Sending pause command to ffmpeg");
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try
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{
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_job.Process.StandardInput.Write("c");
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_isPaused = true;
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error pausing transcoding", ex);
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}
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}
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}
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public void UnpauseTranscoding()
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{
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if (_isPaused)
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{
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_logger.Debug("Sending unpause command to ffmpeg");
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try
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{
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_job.Process.StandardInput.WriteLine();
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_isPaused = false;
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error unpausing transcoding", ex);
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}
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}
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}
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private bool IsThrottleAllowed(TranscodingJob job, int thresholdSeconds)
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{
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var bytesDownloaded = job.BytesDownloaded ?? 0;
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var transcodingPositionTicks = job.TranscodingPositionTicks ?? 0;
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var downloadPositionTicks = job.DownloadPositionTicks ?? 0;
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var path = job.Path;
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var gapLengthInTicks = TimeSpan.FromSeconds(thresholdSeconds).Ticks;
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if (downloadPositionTicks > 0 && transcodingPositionTicks > 0)
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{
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// HLS - time-based consideration
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var targetGap = gapLengthInTicks;
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var gap = transcodingPositionTicks - downloadPositionTicks;
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if (gap < targetGap)
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{
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//_logger.Debug("Not throttling transcoder gap {0} target gap {1}", gap, targetGap);
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return false;
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}
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//_logger.Debug("Throttling transcoder gap {0} target gap {1}", gap, targetGap);
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return true;
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}
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if (bytesDownloaded > 0 && transcodingPositionTicks > 0)
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{
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// Progressive Streaming - byte-based consideration
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try
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{
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var bytesTranscoded = job.BytesTranscoded ?? new FileInfo(path).Length;
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// Estimate the bytes the transcoder should be ahead
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double gapFactor = gapLengthInTicks;
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gapFactor /= transcodingPositionTicks;
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var targetGap = bytesTranscoded * gapFactor;
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var gap = bytesTranscoded - bytesDownloaded;
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if (gap < targetGap)
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{
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//_logger.Debug("Not throttling transcoder gap {0} target gap {1} bytes downloaded {2}", gap, targetGap, bytesDownloaded);
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return false;
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}
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//_logger.Debug("Throttling transcoder gap {0} target gap {1} bytes downloaded {2}", gap, targetGap, bytesDownloaded);
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return true;
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}
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catch
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{
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//_logger.Error("Error getting output size");
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return false;
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}
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}
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//_logger.Debug("No throttle data for " + path);
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return false;
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}
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public void Stop()
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{
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DisposeTimer();
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UnpauseTranscoding();
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}
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public void Dispose()
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{
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DisposeTimer();
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}
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private void DisposeTimer()
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{
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if (_timer != null)
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{
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_timer.Dispose();
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_timer = null;
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}
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}
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}
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}
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