最近继续在家休息,在完成上一个Python抓取某音乐网站爬虫后,琢磨着实现一个基于HTTP推送的 IP视频监控,比如外出的时候,在家里
开启一个监控端(摄像头+服务端),可以看到实时画面,如果再加上自动告警,就更好了。公网访问需要在 路由器上设置 花生壳+端口转发。
计划在退休的安卓手机上实现这IP视频监控软件,虽然应用市场一大堆别人写好的软件,不过我觉得吧,既然是程序员,自己敲代码实现的软件会
更有成就感。考虑到需要先验证下方案的可行性,我用比较熟悉的C# 控制台实现了一个DEMO。
设想的方案:
1.实现一个简单HTTP服务器,用来接受请求并启动一个线程处理图片流的推送功能
2.开发一个实时抓取图片的线程,并将图片交给HTTP推送线程
3.HTTP的请求URL参数中 附带推送频率、图片高度和宽度
4.使用一个IP摄像头监控端(或者Firefox浏览器),实时查看视频画面
5.循环录制视频(未实现)
6.对画面进行监控告警(未实现)
核心技术点:
1.HttpListener (HTTP.SYS)
2.HTTP :multipart/x-mixed-replace;
3.线程同步、委托、事件
4.摄像头驱动、图片抓取(Andrew Kirillov 写的)
5.图片流解析,显示(Andrew Kirillov 写的,也可以直接在Firefox浏览器打开直接显示)
运行截图:
1.视频监控端 (Andrew Kirillov 写的 视频源支持N种,当前配置推送频率50毫秒 w=240&h=120)
2.视频服务端(我写的 简陋的DEMO 不过实现了功能 嘎嘎)
下面开始贴核心源码(最近右胳膊有石膏,左手写代码 凑合看吧!):
1.建立HTTP服务:
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 using (HttpListener listerner = new HttpListener()) 2 { 3 listerner.AuthenticationSchemes = AuthenticationSchemes.Anonymous;//指定身份验证 Anonymous匿名访问 4 listerner.Prefixes.Add("http://+:6666/"); 5 6 //listerner.Prefixes.Add("http://+/"); 7 //listerner.Prefixes.Add("http://+:8080/"); 8 //listerner.Prefixes.Add("http://+:6666/"); 9 //listerner.Prefixes.Add("http://+/video.cgi/"); 10 //listerner.Prefixes.Add("http://+:8080/video.cgi/"); 11 12 listerner.Start(); 13 Console.WriteLine("WebServer Start Successed......."); 14 while (true) 15 { 16 try 17 { 18 //等待请求连接 19 //没有请求则GetContext处于阻塞状态 20 HttpListenerContext ctx = listerner.GetContext(); 21 22 SendImgService oService = new SendImgService(); 23 oService.Ctx = ctx; 24 localsev.NewFrame += new CameraEventHandler(oService.camera_NewFrame); 25 ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc), oService); 26 27 //Thread osThread = new Thread(new ThreadStart(oService.ServiceRun)); 28 //osThread.Start(); 29 } 30 catch (Exception ex) 31 { 32 Console.WriteLine(ex); 33 } 34 } 35 listerner.Stop(); 36 listerner.Close(); 37 }
2.启动本地视频头,并抓取图片
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public void ServiceRun() 2 { 3 4 FilterCollection filters = new FilterCollection(FilterCategory.VideoInputDevice); 5 6 if (filters.Count == 0) 7 throw new ApplicationException(); 8 9 // add all devices to combo 10 foreach (Filter filter in filters) 11 { 12 Console.WriteLine(filter.Name + ":" + filter.MonikerString); 13 } 14 CaptureDevice localSource = new CaptureDevice(); 15 localSource.VideoSource = filters[0].MonikerString; 16 17 // create camera 18 camera = new Camera(localSource); 19 // start camera 20 camera.Start(); 21 22 23 // set event handlers 24 camera.NewFrame += new CameraEventHandler(camera_NewFrame); 25 26 } 27 28 // On new frame ready 29 private void camera_NewFrame(object sender, CameraEventArgs e) 30 { 31 if (seq == 999) 32 { 33 seq = 0; 34 } 35 // Console.WriteLine("LocalCamService get camera_NewFrame ==> {0}", ++seq); 36 37 // lock 38 Monitor.Enter(this); 39 40 if (camera != null) 41 { 42 camera.Lock(); 43 44 // dispose old frame 45 if (lastFrame != null) 46 { 47 lastFrame.Dispose(); 48 } 49 // draw frame 50 if (camera.LastFrame != null) 51 { 52 lastFrame = (Bitmap)camera.LastFrame.Clone(); 53 // notify client 54 if (NewFrame != null) 55 NewFrame(this, new CameraEventArgs(lastFrame)); 56 } 57 58 59 camera.Unlock(); 60 } 61 62 // unlock 63 Monitor.Exit(this); 64 } 65 }
3.图片推送
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
1 public void ServiceRun() 2 { 3 remoteInfo = ctx.Request.RemoteEndPoint.ToString(); 4 string intervalstr = ctx.Request.QueryString["i"]; 5 string widthstr = ctx.Request.QueryString["w"]; 6 string heightstr = ctx.Request.QueryString["h"]; 7 8 if (!string.IsNullOrWhiteSpace(intervalstr)) 9 { 10 interval = int.Parse(intervalstr); 11 } 12 if (!string.IsNullOrWhiteSpace(widthstr)) 13 { 14 width = int.Parse(widthstr); 15 } 16 if (!string.IsNullOrWhiteSpace(heightstr)) 17 { 18 height = int.Parse(heightstr); 19 } 20 Console.WriteLine("Accept one new request:{0},interval:[{1}]", remoteInfo, interval); 21 22 23 ctx.Response.StatusCode = 200;//设置返回给客服端http状态代码 24 ctx.Response.ContentType = "multipart/x-mixed-replace; boundary=--BoundaryString"; 25 26 string rspheard = "--BoundaryString\r\nContent-type: image/jpg\r\nContent-Length: {0}\r\n\r\n"; 27 string strrn = "\r\n"; 28 29 using (Stream stream = ctx.Response.OutputStream) 30 { 31 while (true) 32 { 33 Thread.Sleep(interval); 34 35 try 36 { 37 // lock 38 Monitor.Enter(this); 39 40 if (newFrame == null) 41 { 42 continue; 43 } 44 //得到一个ms对象 45 byte[] imageBuffer; 46 using (MemoryStream ms = new MemoryStream()) 47 { 48 49 //newFrame = (Bitmap)GetThumbnail(newFrame, width, height); 50 //将图片保存至内存流 51 newFrame.Save(ms, ImageFormat.Jpeg); 52 53 rspheard = string.Format(rspheard, ms.Length); 54 55 byte[] heardbuff = Encoding.ASCII.GetBytes(rspheard); 56 stream.Write(heardbuff, 0, heardbuff.Length); 57 58 imageBuffer = new byte[512]; 59 int c; 60 ms.Position = 0; 61 //通过内存流读取到imageBytes 62 while ((c = ms.Read(imageBuffer, 0, 512)) > 0) 63 { 64 stream.Write(imageBuffer, 0, c); 65 } 66 byte[] rnbuff = Encoding.ASCII.GetBytes(strrn); 67 stream.Write(rnbuff, 0, rnbuff.Length); 68 69 Console.WriteLine("[{0}] : SendImgService send NewFrame", remoteInfo); 70 71 } 72 73 // stream.Flush(); 74 } 75 catch (Exception ex) 76 { 77 Console.WriteLine(ex); 78 79 break; 80 } 81 finally 82 { 83 // unlock 84 Monitor.Exit(this); 85 } 86 } 87 } 88 Console.WriteLine("[{0}] : 线程结束...", remoteInfo); 89 }
附件:(刚会传文件,还不知道怎么插入链接,谁教我下?)
可运行程序:
https://files.cnblogs.com/files/ryhan/%E7%9B%91%E6%8E%A7%E5%8F%8A%E6%9C%8D%E5%8A%A1%E7%AB%AF%E5%8F%AF%E8%BF%90%E8%A1%8C%E7%A8%8B%E5%BA%8F.zip
监控端源码:
https://files.cnblogs.com/files/ryhan/%E7%9B%91%E6%8E%A7%E7%AB%AF%E6%BA%90%E7%A0%81.zip
服务端源码:
https://files.cnblogs.com/files/ryhan/%E6%9C%8D%E5%8A%A1%E7%AB%AF%E6%BA%90%E7%A0%81%28%E5%8D%9A%E5%AE%A2%E4%B8%AD%E5%AE%9E%E7%8E%B0%29.zip
PS:
1.建议用VS2010打开
2.监控端cv_src目录下cv3.sln为监控客户端程序,用来看画面,cameras.config配置视频源
3.HttpImageStream是本次实现的图片推送Demo 效率上估计有点问题。
4.运行HttpImageStream时,建议电脑上有摄像头,不然估计会无法启动。