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:
using (HttpListener listerner = new HttpListener()) { listerner.AuthenticationSchemes = AuthenticationSchemes.Anonymous;//指定身份验证 Anonymous匿名访问 listerner.Prefixes.Add("http://+:6666/"); //listerner.Prefixes.Add("http://+/"); //listerner.Prefixes.Add("http://+:8080/"); //listerner.Prefixes.Add("http://+:6666/"); //listerner.Prefixes.Add("http://+/video.cgi/"); //listerner.Prefixes.Add("http://+:8080/video.cgi/"); listerner.Start(); Console.WriteLine("WebServer Start Successed......."); while (true) { try { //等待请求连接 //没有请求则GetContext处于阻塞状态 HttpListenerContext ctx = listerner.GetContext(); SendImgService oService = new SendImgService(); oService.Ctx = ctx; localsev.NewFrame += new CameraEventHandler(oService.camera_NewFrame); ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc), oService); //Thread osThread = new Thread(new ThreadStart(oService.ServiceRun)); //osThread.Start(); } catch (Exception ex) { Console.WriteLine(ex); } } listerner.Stop(); listerner.Close(); }
2.启动本地视频头,并抓取图片
public void ServiceRun() { FilterCollection filters = new FilterCollection(FilterCategory.VideoInputDevice); if (filters.Count == ) throw new ApplicationException(); // add all devices to combo foreach (Filter filter in filters) { Console.WriteLine(filter.Name + ":" + filter.MonikerString); } CaptureDevice localSource = new CaptureDevice(); localSource.VideoSource = filters[].MonikerString; // create camera camera = new Camera(localSource); // start camera camera.Start(); // set event handlers camera.NewFrame += new CameraEventHandler(camera_NewFrame); } // On new frame ready private void camera_NewFrame(object sender, CameraEventArgs e) { if (seq == ) { seq = ; } // Console.WriteLine("LocalCamService get camera_NewFrame ==> {0}", ++seq); // lock Monitor.Enter(this); if (camera != null) { camera.Lock(); // dispose old frame if (lastFrame != null) { lastFrame.Dispose(); } // draw frame if (camera.LastFrame != null) { lastFrame = (Bitmap)camera.LastFrame.Clone(); // notify client if (NewFrame != null) NewFrame(this, new CameraEventArgs(lastFrame)); } camera.Unlock(); } // unlock Monitor.Exit(this); } }
3.图片推送
public void ServiceRun() { remoteInfo = ctx.Request.RemoteEndPoint.ToString(); string intervalstr = ctx.Request.QueryString["i"]; string widthstr = ctx.Request.QueryString["w"]; string heightstr = ctx.Request.QueryString["h"]; if (!string.IsNullOrWhiteSpace(intervalstr)) { interval = int.Parse(intervalstr); } if (!string.IsNullOrWhiteSpace(widthstr)) { width = int.Parse(widthstr); } if (!string.IsNullOrWhiteSpace(heightstr)) { height = int.Parse(heightstr); } Console.WriteLine("Accept one new request:{0},interval:[{1}]", remoteInfo, interval); ctx.Response.StatusCode = ;//设置返回给客服端http状态代码 ctx.Response.ContentType = "multipart/x-mixed-replace; boundary=--BoundaryString"; string rspheard = "--BoundaryString\r\nContent-type: image/jpg\r\nContent-Length: {0}\r\n\r\n"; string strrn = "\r\n"; using (Stream stream = ctx.Response.OutputStream) { while (true) { Thread.Sleep(interval); try { // lock Monitor.Enter(this); if (newFrame == null) { continue; } //得到一个ms对象 byte[] imageBuffer; using (MemoryStream ms = new MemoryStream()) { //newFrame = (Bitmap)GetThumbnail(newFrame, width, height); //将图片保存至内存流 newFrame.Save(ms, ImageFormat.Jpeg); rspheard = string.Format(rspheard, ms.Length); byte[] heardbuff = Encoding.ASCII.GetBytes(rspheard); stream.Write(heardbuff, , heardbuff.Length); imageBuffer = new byte[]; int c; ms.Position = ; //通过内存流读取到imageBytes while ((c = ms.Read(imageBuffer, , )) > ) { stream.Write(imageBuffer, , c); } byte[] rnbuff = Encoding.ASCII.GetBytes(strrn); stream.Write(rnbuff, , rnbuff.Length); Console.WriteLine("[{0}] : SendImgService send NewFrame", remoteInfo); } // stream.Flush(); } catch (Exception ex) { Console.WriteLine(ex); break; } finally { // unlock Monitor.Exit(this); } } } Console.WriteLine("[{0}] : 线程结束...", remoteInfo); }
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:
http://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:
http://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:
http://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。
标签:http,string,C#,IP,ctx,camera,listerner,new,DEMO From: https://www.cnblogs.com/sexintercourse/p/17126040.html