// Two Cameras Test sample application
// AForge.NET framework
// http://www.aforgenet.com/framework/
//
// Copyright © AForge.NET, 2006-2011
// contacts@aforgenet.com
//

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

using AForge.Video;
using AForge.Video.DirectShow;

namespace Web_Camera_Test1
{
    public partial class MainForm : Form
    {
        // list of video devices
        FilterInfoCollection videoDevices;
        // stop watch for measuring fps
        private Stopwatch stopWatch = null;

        public MainForm()
        {
            InitializeComponent();

            camera1FpsLabel.Text = string.Empty;
            camera2FpsLabel.Text = string.Empty;

            // show device list
            try
            {
                // enumerate video devices
                videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

                if (videoDevices.Count == 0)
                {
                    throw new Exception();
                }

                for (int i = 1, n = videoDevices.Count; i <= n; i++)
                {
                    string cameraName = i + " : " + videoDevices[i - 1].Name;

                    camera1Combo.Items.Add(cameraName);
                    camera2Combo.Items.Add(cameraName);
                }

                // check cameras count
                if (videoDevices.Count == 1)
                {
                    camera2Combo.Items.Clear();

                    camera2Combo.Items.Add("Only one camera found");
                    camera2Combo.SelectedIndex = 0;
                    camera2Combo.Enabled = false;
                }
                else
                {
                    camera2Combo.SelectedIndex = 1;
                }
                camera1Combo.SelectedIndex = 0;
            }
            catch
            {
                startButton.Enabled = false;

                camera1Combo.Items.Add("No cameras found");
                camera2Combo.Items.Add("No cameras found");

                camera1Combo.SelectedIndex = 0;
                camera2Combo.SelectedIndex = 0;

                camera1Combo.Enabled = false;
                camera2Combo.Enabled = false;
            }
        }

        // On form closing
        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            StopCameras();
        }

        // On "Start" button click
        private void startButton_Click(object sender, EventArgs e)
        {
            StartCameras();

            startButton.Enabled = false;
            stopButton.Enabled = true;
        }

        // On "Stop" button click
        private void stopButton_Click(object sender, EventArgs e)
        {
            StopCameras();

            startButton.Enabled = true;
            stopButton.Enabled = false;

            camera1FpsLabel.Text = string.Empty;
            camera2FpsLabel.Text = string.Empty;
        }

        // Start cameras
        private void StartCameras()
        {
            // create first video source
            VideoCaptureDevice videoSource1 = new VideoCaptureDevice(videoDevices[camera1Combo.SelectedIndex].MonikerString);
            videoSource1.DesiredFrameRate = 10;

            videoSourcePlayer1.VideoSource = videoSource1;
            videoSourcePlayer1.Start();

            // create second video source
            if (camera2Combo.Enabled == true)
            {
                System.Threading.Thread.Sleep(500);

                VideoCaptureDevice videoSource2 = new VideoCaptureDevice(videoDevices[camera2Combo.SelectedIndex].MonikerString);
                videoSource2.DesiredFrameRate = 10;

                videoSourcePlayer2.VideoSource = videoSource2;
                videoSourcePlayer2.Start();
            }

            // reset stop watch
            stopWatch = null;
            // start timer
            timer.Start();
        }

        // Stop cameras
        private void StopCameras()
        {
            timer.Stop();

            videoSourcePlayer1.SignalToStop();
            videoSourcePlayer2.SignalToStop();

            videoSourcePlayer1.WaitForStop();
            videoSourcePlayer2.WaitForStop();
        }

        // On times tick - collect statistics
        private void timer_Tick(object sender, EventArgs e)
        {
            IVideoSource videoSource1 = videoSourcePlayer1.VideoSource;
            IVideoSource videoSource2 = videoSourcePlayer2.VideoSource;

            int framesReceived1 = 0;
            int framesReceived2 = 0;

            // get number of frames for the last second
            if (videoSource1 != null)
            {
                framesReceived1 = videoSource1.FramesReceived;
            }

            if (videoSource2 != null)
            {
                framesReceived2 = videoSource2.FramesReceived;
            }

            if (stopWatch == null)
            {
                stopWatch = new Stopwatch();
                stopWatch.Start();
            }
            else
            {
                stopWatch.Stop();

                float fps1 = 1000.0f * framesReceived1 / stopWatch.ElapsedMilliseconds;
                float fps2 = 1000.0f * framesReceived2 / stopWatch.ElapsedMilliseconds;

                camera1FpsLabel.Text = fps1.ToString("F2") + " fps";
                camera2FpsLabel.Text = fps2.ToString("F2") + " fps";

                stopWatch.Reset();
                stopWatch.Start();
            }
        }
    }
}