android - 多个 Android 设备上的远程网络摄像机视频

Question

我的一位客户在教堂安装了网络摄像机 (D-Link S930L)，并希望使用 Android 应用程序与他人分享视频。

要注意的是，多个(几百个)用户将同时连接到该服务，并且他还希望将音频从网络摄像机流式传输到 Android 应用程序。

我该怎么做？我发现的所有其他主题都涉及直接将视频流式传输给少数用户。我需要在 Android 应用程序中使用哪些控件来显示流，我如何才能支持几百个用户？任何帮助将不胜感激。

发现以下链接适用于相机:

http://aaa.bbb.ccc.ddd/mjpeg.cgi (动态 JPEG)

http://aaa.bbb.ccc.ddd/IMAGE.JPG (JPEG)

http://aaa.bbb.ccc.ddd/VIDEO.CGI (视频)

http://aaa.bbb.ccc.ddd/image/jpeg.cgi (JPEG)

谢谢

Answer 1

我的 friend 用 C# 为我做了一些事情:

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Windows.Forms;
using System.IO;

namespace kamera
{
    public partial class Form1 : Form
    {

        //private static String imageUrl = "http://cam-kk-03/now.jpg";
        private static String imageUrl=null;
        private static Thread t ;  
        private static Image webImage;
        private static List<String> kamere;
        System.Windows.Forms.Timer timer = new System.Windows.Forms.Timer();
        private static int intervalOsvezevanja=3000; //ms
        public Form1()
        {
            InitializeComponent();
            ////timer k pokliče funkcijo vsake x sekund
            //AutoResetEvent autoEvent = new AutoResetEvent(false);
            //TimerCallback tcb = updatePicture;
            //System.Threading.Timer stateTimer = new System.Threading.Timer(tcb, autoEvent, 0, 200);


            t = new Thread(updatePicture);
            t.IsBackground = true;
            t.Start();

            timer.Tick += new EventHandler(timer_Tick); // Everytime timer ticks, timer_Tick will be called
            timer.Interval = (intervalOsvezevanja) ;             // Timer will tick every 0.05 seconds
            timer.Enabled = true;                       // Enable the timer
            timer.Start();                              // Start the timer

            //skrijemo formo za dodajanje kamer
            panelDodajKamero.Hide();

            //inicializacija
            kamere = new List<String>();
            tbNaslovKamere.Text =  "cam-kk-";
            preberiDatoteko();
        }

        void timer_Tick(object sender, EventArgs e)
        {
            pictureBox1.Image = webImage;
        }

        ~Form1() {
            //t.Join();
            t.Abort();
            timer.Stop();
            timer.Dispose();
        }

        private void updatePicture(object stateInfo)
        {
            while (true)
            {
                if (imageUrl != null)
                {
                    try
                    {
                        WebRequest requestPic = WebRequest.Create(imageUrl);
                        WebResponse responsePic = requestPic.GetResponse();
                        webImage = Image.FromStream(responsePic.GetResponseStream());
                        //webImage.Save("C:\\Users\\Public\\kamera\\kamera" + fileName + ".jpg");
                    }
                    catch{}
                }
                Thread.Sleep(intervalOsvezevanja);
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            if (menuStrip1.Visible)
            {
                menuStrip1.Hide();
            }
            else
            {
                menuStrip1.Show();
            }
        }

        private void menjajKamero(String camAddr)
        {
            if (camAddr.Contains("http"))
            {
                imageUrl = camAddr;
            }
            else
            {
                imageUrl = "http://" + camAddr + "/now.jpg";
            }
        }

        private void btDodajKamero_Click(object sender, EventArgs e)
        {
            String webAddres;
            if (tbNaslovKamere.Text.Contains("http"))
            {
                webAddres = tbNaslovKamere.Text;
            }
            else
            {
                webAddres = "http://" + tbNaslovKamere.Text + "/now.jpg";
            }
            if (RemoteFileExists(webAddres))
            {
                if (!kamere.Contains(tbNaslovKamere.Text) && !kamere.Contains(webAddres))
                {
                    kamere.Add(tbNaslovKamere.Text);
                    //kamere.Add(webAddres);
                }
                menjajKamero(tbNaslovKamere.Text);
                //menjajKamero(webAddres);
                panelDodajKamero.Hide();
                izpisKamer();
                tbNaslovKamere.Text = "cam-kk-";
            }
            else
            {
                MessageBox.Show("Ne najdem Kamere");
            }
        }

        private void dodajKameroToolStripMenuItem_Click(object sender, EventArgs e)
        {
            panelDodajKamero.Show();
        }

        private void izpisKamer()
        {
            //zanka ki odstrani vse prej dodane kamere
            textBox1.Text = kamereToolStripMenuItem.DropDownItems.Count.ToString();

            foreach (String kamera in kamere)
            {
                kamereToolStripMenuItem.DropDownItems.RemoveByKey(kamera);
            }

            System.IO.StreamWriter file = new System.IO.StreamWriter(System.Environment.CurrentDirectory + "\\kamere.txt");
            foreach (String kamera in kamere)
            {
                ToolStripDropDownButton btTemp = new ToolStripDropDownButton(kamera, null, kameraOnClick, kamera);
                file.WriteLine(kamera);

                //dodamo trenutno kamero, ki je v kamerah.txt
                kamereToolStripMenuItem.DropDownItems.Add(btTemp);
            }
            file.Dispose();
            file.Close();
        }

        private void kameraOnClick(object sender, EventArgs e)
        {
            //tbNaslovKamere.Text+=sender.ToString();
            imageUrl = "http://" + sender.ToString() + "/now.jpg";
        }

        private void izhodToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void preberiDatoteko()
        {
            String vrstica;
            // Read the file as one string.
            if (File.Exists(System.Environment.CurrentDirectory + "\\kamere.txt"))
            {
                kamere = new List<String>();
                StreamReader myFile = new StreamReader(System.Environment.CurrentDirectory + "\\kamere.txt");
                while ((vrstica = myFile.ReadLine()) != null)
                {
                    //zapis v list
                    kamere.Add(vrstica);
                    //doda v meni
                    ToolStripDropDownButton btTemp = new ToolStripDropDownButton(vrstica, null, kameraOnClick, vrstica);
                    kamereToolStripMenuItem.DropDownItems.Add(btTemp);
                }
                myFile.Close();
            }
        }

        private void menuPobrisiKamere()
        {
            foreach (String kamera in kamere)
            {
                kamereToolStripMenuItem.DropDownItems.RemoveByKey(kamera);
            }
            kamere = new List<String>();
        }

        private void odpriToolStripMenuItem_Click(object sender, EventArgs e)
        {
            // Create an instance of the open file dialog box.
            OpenFileDialog openFileDialog1 = new OpenFileDialog();

            // Set filter options and filter index.
            openFileDialog1.Filter = "Text Files (.txt)|*.txt";
            openFileDialog1.FilterIndex = 1;

            //openFileDialog1.Multiselect = true;
            // Call the ShowDialog method to show the dialog box.
            DialogResult userClickedOK = openFileDialog1.ShowDialog();

            //tbNaslovKamere.Text = userClickedOK.ToString();
            // Process input if the user clicked OK.
            if (userClickedOK.ToString().Equals("OK"))
            {
                menuPobrisiKamere();
                String vrstica;

                // Open the selected file to read.
                System.IO.Stream fileStream = openFileDialog1.OpenFile();
                kamere = new List<String>();
                StreamReader myFile = new StreamReader(fileStream);
                while ((vrstica = myFile.ReadLine()) != null)
                {
                    //zapis v list
                    kamere.Add(vrstica);
                    //doda v meni
                    ToolStripDropDownButton btTemp = new ToolStripDropDownButton(vrstica, null, kameraOnClick, vrstica);
                    kamereToolStripMenuItem.DropDownItems.Add(btTemp);
                }
                myFile.Dispose();
                myFile.Close();
                fileStream.Dispose();
                fileStream.Close();
                myFile.Close();
                fileStream.Close();
            }
        }

        private void pobrišiKamereToolStripMenuItem_Click(object sender, EventArgs e)
        {
            menuPobrisiKamere();
        }

        private void zbrišiShranjeneKamereToolStripMenuItem_Click(object sender, EventArgs e)
        {
            menuPobrisiKamere();
            System.IO.StreamWriter file = new System.IO.StreamWriter(System.Environment.CurrentDirectory + "\\kamere.txt");
            file.Dispose();
            file.Close();
        }

        private void pictureBox1_DoubleClick(object sender, EventArgs e)
        {
            Form1 frm1 = new Form1();
            frm1.Size = new Size(100, frm1.Size.Height);
        }

        private bool RemoteFileExists(string url)
        {
            try
            {
                //Creating the HttpWebRequest
                HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
                //Setting the Request method HEAD, you can also use GET too.
                request.Method = "HEAD";
                //Getting the Web Response.
                HttpWebResponse response = request.GetResponse() as HttpWebResponse;
                //Returns TRUE if the Status code == 200
                return (response.StatusCode == HttpStatusCode.OK);
            }
            catch
            {
                //Any exception will returns false.
                return false;
            }
        }
    }
}

这将打开表单并打开链接(主机)并显示来自 http://IP/HOSTNAME/now.jpg 的图像，可以更改为其他内容。将主机写在txt文件中...一个非常简单有效和可爱的应用程序。经过我的优化，现在只需要 0-1 CPU 时间和最大 70K 内存。

我希望您会发现有用的...是一个 .Net 3.5 应用程序。