LiveScan3D/LiveScanServer/KinectSocket.cs

//   Copyright (C) 2015  Marek Kowalski (M.Kowalski@ire.pw.edu.pl), Jacek Naruniec (J.Naruniec@ire.pw.edu.pl)
//   License: MIT Software License   See LICENSE.txt for the full license.

//   If you use this software in your research, then please use the following citation:

//    Kowalski, M.; Naruniec, J.; Daniluk, M.: "LiveScan3D: A Fast and Inexpensive 3D Data
//    Acquisition System for Multiple Kinect v2 Sensors". in 3D Vision (3DV), 2015 International Conference on, Lyon, France, 2015

//    @INPROCEEDINGS{Kowalski15,
//        author={Kowalski, M. and Naruniec, J. and Daniluk, M.},
//        booktitle={3D Vision (3DV), 2015 International Conference on},
//        title={LiveScan3D: A Fast and Inexpensive 3D Data Acquisition System for Multiple Kinect v2 Sensors},
//        year={2015},
//    }
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;

namespace KinectServer
{
    public delegate void SocketChangedHandler();

    public class KinectSocket
    {
        Socket oSocket;
        byte[] byteToSend = new byte[1];
        public bool bFrameCaptured = false;
        public bool bLatestFrameReceived = false;
        public bool bStoredFrameReceived = false;
        public bool bCalibrated = false;
        //The pose of the sensor in the scene (used by the OpenGLWindow to show the sensor)
        public AffineTransform oCameraPose = new AffineTransform();
        //The transform that maps the vertices in the sensor coordinate system to the world corrdinate system.
        public AffineTransform oWorldTransform = new AffineTransform();

        public string sSocketState;

        public List<byte> lFrameRGB = new List<byte>();
        public List<Single> lFrameVerts = new List<Single>();

        public event SocketChangedHandler eChanged;

        public KinectSocket(Socket clientSocket)
        {
            oSocket = clientSocket;
            sSocketState = oSocket.RemoteEndPoint.ToString() + " Calibrated = false";
        }

        public void CaptureFrame()
        {
            bFrameCaptured = false;
            byteToSend[0] = 0;
            SendByte();
        }

        public void Calibrate()
        {            
            bCalibrated = false;
            sSocketState = oSocket.RemoteEndPoint.ToString() + " Calibrated = false";

            byteToSend[0] = 1;
            SendByte();

            UpdateSocketState();
        }

        public void SendSettings(KinectSettings settings)
        {
            List<byte> lData = settings.ToByteList();

            byte[] bTemp = BitConverter.GetBytes(lData.Count);
            lData.InsertRange(0, bTemp);
            lData.Insert(0, 2);

            if (SocketConnected())
                oSocket.Send(lData.ToArray());
        }

        public void RequestStoredFrame()
        {
            byteToSend[0] = 3;
            SendByte();
            bStoredFrameReceived = false;
        }

        public void RequestLastFrame()
        {
            byteToSend[0] = 4;
            SendByte();
            bLatestFrameReceived = false;
        }

        public void SendCalibrationData()
        {
            int size = 1 + 2 * (9 + 3) * sizeof(float);
            byte[] data = new byte[size];
            int i = 0;

            data[i] = 5;
            i++;

            Buffer.BlockCopy(oWorldTransform.R, 0, data, i, 9 * sizeof(float));
            i += 9 * sizeof(float);
            Buffer.BlockCopy(oWorldTransform.t, 0, data, i, 3 * sizeof(float));
            i += 3 * sizeof(float);

            Buffer.BlockCopy(oCameraPose.R, 0, data, i, 9 * sizeof(float));
            i += 9 * sizeof(float);
            Buffer.BlockCopy(oCameraPose.t, 0, data, i, 3 * sizeof(float));
            i += 3 * sizeof(float);


            if (SocketConnected())
                oSocket.Send(data);
        }

        public void ClearStoredFrames()
        {
            byteToSend[0] = 6;
            SendByte();
        }

        public void ReceiveCalibrationData()
        {
            bCalibrated = true;

            byte[] buffer = Receive(sizeof(int) * 1);
            //currently not used
            int markerId = BitConverter.ToInt32(buffer, 0);

            buffer = Receive(sizeof(float) * 9);
            Buffer.BlockCopy(buffer, 0, oWorldTransform.R, 0, sizeof(float) * 9);

            buffer = Receive(sizeof(float) * 3);
            Buffer.BlockCopy(buffer, 0, oWorldTransform.t, 0, sizeof(float) * 3);

            buffer = Receive(sizeof(float) * 9);
            Buffer.BlockCopy(buffer, 0, oCameraPose.R, 0, sizeof(float) * 9);

            buffer = Receive(sizeof(float) * 3);
            Buffer.BlockCopy(buffer, 0, oCameraPose.t, 0, sizeof(float) * 3);

            UpdateSocketState();
        }

        public void ReceiveFrame()
        {
            lFrameRGB.Clear();
            lFrameVerts.Clear();

            int nToRead;
            byte[] buffer = new byte[1024];

            while (oSocket.Available == 0)
            {
                if (!SocketConnected())
                    return;
            }


            oSocket.Receive(buffer, 4, SocketFlags.None);

            //string result = System.Text.Encoding.UTF8.GetString(buffer);
            //n_to_read = Int32.Parse(result);

            nToRead = BitConverter.ToInt32(buffer, 0);

            if (nToRead == 0)
                return;
            
            buffer = new byte[nToRead];
            int nAlreadyRead = 0;

            while (nAlreadyRead != nToRead)
            {
                while (oSocket.Available == 0)
                {
                    if (!SocketConnected())
                        return;
                }

                nAlreadyRead += oSocket.Receive(buffer, nAlreadyRead, nToRead - nAlreadyRead, SocketFlags.None);
            }

            int point_size = 3 + 3 * 4;
            int n_vertices = nToRead / point_size;

            for (int i = 0; i < n_vertices; i++)
            {
                for (int j = 0; j < 3; j++)
                {
                    lFrameRGB.Add(buffer[i * point_size + j]);
                    lFrameVerts.Add(BitConverter.ToSingle(buffer, i * point_size + j * 4 + 3));
                }
            }
        }

        public byte[] Receive(int nBytes)
        {
            byte[] buffer;
            if (oSocket.Available != 0)
            {
                buffer = new byte[Math.Min(nBytes, oSocket.Available)];
                oSocket.Receive(buffer, nBytes, SocketFlags.None);
            }
            else
                buffer = new byte[0];

            return buffer;
        }

        public bool SocketConnected()
        {
            bool part1 = oSocket.Poll(1000, SelectMode.SelectRead);
            bool part2 = (oSocket.Available == 0);

            if (part1 && part2)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

        private void SendByte()
        {
            oSocket.Send(byteToSend);
        }

        public void UpdateSocketState()
        {
            if (bCalibrated)
                sSocketState = oSocket.RemoteEndPoint.ToString() + " Calibrated = true";
            else
                sSocketState = oSocket.RemoteEndPoint.ToString() + " Calibrated = false";

            if (eChanged != null)
                eChanged();
        }
    }
}