|
|
|
|
@ -0,0 +1,157 @@
|
|
|
|
|
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;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
Luke Pulverenti
10 years ago