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using MediaBrowser.Model.Logging;
using System;
using System.IO;
using System.Threading;
namespace MediaBrowser.Api.Playback
{
public class TranscodingThrottler : IDisposable
{
private readonly TranscodingJob _job;
private readonly ILogger _logger;
private Timer _timer;
public void Start()
{
_timer = new Timer(TimerCallback, null, 1000, 1000);
}
private void TimerCallback(object state)
{
if (IsThrottleAllowed(_job))
{
PauseTranscoding();
}
else
{
UnpauseTranscoding();
}
}
private void PauseTranscoding()
{
_logger.Debug("Sending pause command to ffmpeg");
_job.Process.StandardInput.WriteLine("p");
}
private void UnpauseTranscoding()
{
_logger.Debug("Sending unpause command to ffmpeg");
_job.Process.StandardInput.WriteLine("u");
}
private readonly long _gapLengthInTicks = TimeSpan.FromMinutes(2).Ticks;
public TranscodingThrottler(TranscodingJob job, ILogger logger)
{
_job = job;
_logger = logger;
}
private bool IsThrottleAllowed(TranscodingJob job)
{
//var job = string.IsNullOrEmpty(request.TranscodingJobId) ?
//null :
//ApiEntryPoint.Instance.GetTranscodingJob(request.TranscodingJobId);
//var limits = new List<long>();
//if (state.InputBitrate.HasValue)
//{
// // Bytes per second
// limits.Add((state.InputBitrate.Value / 8));
//}
//if (state.InputFileSize.HasValue && state.RunTimeTicks.HasValue)
//{
// var totalSeconds = TimeSpan.FromTicks(state.RunTimeTicks.Value).TotalSeconds;
// if (totalSeconds > 1)
// {
// var timeBasedLimit = state.InputFileSize.Value / totalSeconds;
// limits.Add(Convert.ToInt64(timeBasedLimit));
// }
//}
//// Take the greater of the above to methods, just to be safe
//var throttleLimit = limits.Count > 0 ? limits.First() : 0;
//// Pad to play it safe
//var bytesPerSecond = Convert.ToInt64(1.05 * throttleLimit);
//// Don't even start evaluating this until at least two minutes have content have been consumed
//var targetGap = throttleLimit * 120;
var bytesDownloaded = job.BytesDownloaded ?? 0;
var transcodingPositionTicks = job.TranscodingPositionTicks ?? 0;
var downloadPositionTicks = job.DownloadPositionTicks ?? 0;
var path = job.Path;
if (downloadPositionTicks > 0 && transcodingPositionTicks > 0)
{
// HLS - time-based consideration
var targetGap = _gapLengthInTicks;
var gap = transcodingPositionTicks - downloadPositionTicks;
if (gap < targetGap)
{
//Logger.Debug("Not throttling transcoder gap {0} target gap {1}", gap, targetGap);
return false;
}
//Logger.Debug("Throttling transcoder gap {0} target gap {1}", gap, targetGap);
return true;
}
if (bytesDownloaded > 0 && transcodingPositionTicks > 0)
{
// Progressive Streaming - byte-based consideration
try
{
var bytesTranscoded = job.BytesTranscoded ?? new FileInfo(path).Length;
// Estimate the bytes the transcoder should be ahead
double gapFactor = _gapLengthInTicks;
gapFactor /= transcodingPositionTicks;
var targetGap = bytesTranscoded * gapFactor;
var gap = bytesTranscoded - bytesDownloaded;
if (gap < targetGap)
{
//Logger.Debug("Not throttling transcoder gap {0} target gap {1} bytes downloaded {2}", gap, targetGap, bytesDownloaded);
return false;
}
//Logger.Debug("Throttling transcoder gap {0} target gap {1} bytes downloaded {2}", gap, targetGap, bytesDownloaded);
return true;
}
catch
{
//Logger.Error("Error getting output size");
}
}
else
{
//Logger.Debug("No throttle data for " + path);
}
return false;
}
public void Dispose()
{
DisposeTimer();
}
private void DisposeTimer()
{
if (_timer != null)
{
_timer.Dispose();
_timer = null;
}
}
}
}
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