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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media.Imaging;
using Tango.Core;
using Tango.Core.Helpers;
using Tango.Core.IO;
namespace Tango.FSE.Common.RemoteDesktop
{
public class Mp4VideoEncoder : ExtendedObject, IDisposable
{
private class QueueItem
{
public BitmapSource Frame { get; set; }
public bool IsComplete { get; set; }
}
private Thread _queueThread;
private ProducerConsumerQueue<QueueItem> _framesQueue;
private TemporaryFolder _tempFolder;
private int _totalFrames;
private String _ffmpegPath;
public event EventHandler<TangoProgressChangedEventArgs<double>> Progress;
public bool IsStarted { get; set; }
public Mp4VideoEncoder()
{
_ffmpegPath = Path.Combine(AssemblyHelper.GetCurrentAssemblyFolder(), "ffmpeg.exe");
}
private void QueueThreadMethod()
{
_tempFolder = TemporaryManager.CreateFolder();
while (true)
{
var item = _framesQueue.BlockDequeue();
if (!item.IsComplete)
{
String file = Path.Combine(_tempFolder, "image" + (_totalFrames++) + ".png");
using (FileStream fs = new FileStream(file, FileMode.Create))
{
PngBitmapEncoder enc = new PngBitmapEncoder();
enc.Frames.Add(BitmapFrame.Create(item.Frame));
enc.Save(fs);
}
}
else
{
while (_framesQueue.Count > 0)
{
_framesQueue.BlockDequeue();
}
break;
}
}
}
public void Start()
{
if (!IsStarted)
{
_framesQueue = new ProducerConsumerQueue<QueueItem>();
IsStarted = true;
_totalFrames = 0;
_queueThread = new Thread(QueueThreadMethod);
_queueThread.IsBackground = true;
_queueThread.Start();
}
}
public void Cancel()
{
Stop();
ClearTemporaryFiles();
}
public void Stop()
{
if (IsStarted)
{
_framesQueue.BlockEnqueue(new QueueItem() { IsComplete = true });
IsStarted = false;
}
}
public Task Save(VideoConfiguration config, String outputFile)
{
if (IsStarted)
{
throw new InvalidOperationException("Stop before save!");
}
return Task.Factory.StartNew(() =>
{
try
{
//Wait for queue to complete.
while (_framesQueue.Count > 0) { }
String args = String.Empty;
int width = config.FrameWidth % 2 == 0 ? config.FrameWidth : config.FrameWidth + 1;
int height = config.FrameHeight % 2 == 0 ? config.FrameHeight : config.FrameHeight + 1;
args = $"-y -loglevel info -framerate {Math.Round(config.FrameRate, 1)} -i \"{Path.Combine(_tempFolder, "image")}%d.png\" -f mp4 -c:v libx264 -crf {(int)config.Quality} -vf scale={width}:{height} \"{outputFile}\"";
var startInfo = new ProcessStartInfo(_ffmpegPath, args);
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.UseShellExecute = false;
startInfo.CreateNoWindow = true;
startInfo.RedirectStandardInput = true;
startInfo.RedirectStandardOutput = true;
startInfo.RedirectStandardError = true;
Regex progressRegEx = new Regex("frame= (\\d+) ");
var process = Process.Start(startInfo);
process.ErrorDataReceived += (x, e) =>
{
if (e.Data != null)
{
var match = progressRegEx.Match(e.Data);
if (match.Success && match.Groups.Count == 2)
{
int frame = int.Parse(match.Groups[1].Value);
OnProgress(frame, _totalFrames);
}
}
};
process.OutputDataReceived += (x, e) =>
{
};
process.BeginOutputReadLine();
process.BeginErrorReadLine();
process.WaitForExit();
}
catch (Exception ex)
{
throw ex;
}
finally
{
ClearTemporaryFiles();
}
});
}
public void PushFrame(BitmapSource source)
{
if (IsStarted)
{
var cloned = source.Clone();
cloned.Freeze();
_framesQueue.BlockEnqueue(new QueueItem() { Frame = cloned });
}
}
private void ClearTemporaryFiles()
{
_tempFolder?.DeleteAsync();
}
protected virtual void OnProgress(int frame, int totalFrames)
{
Progress?.Invoke(this, new TangoProgressChangedEventArgs<double>()
{
Progress = new TangoProgress<double>()
{
IsIndeterminate = false,
Maximum = totalFrames,
Value = frame,
},
});
}
public void Dispose()
{
Stop();
ClearTemporaryFiles();
}
}
}
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