一、简介

目前市面上直播推流的软件有很多，拉流也很常见。近期因为业务需要，需要搭建一整套服务端推流，客户端拉流的程序。随即进行了展开研究，花了一个小时做了个基于winfrom桌面版的推拉流软件。另外稍微啰嗦两句，主要怕你们翻不到最下面。目前软件还是一个简化版的，但已足够日常使用，比如搭建一套餐馆的监控，据我了解，小餐馆装个监控一般3000—5000，如果自己稍微懂点软件知识，几百元买几个摄像头+一台电脑，搭建的监控不足千元，甚至一两百元足够搞定了。这是我研究这套软件的另外一个想法。

二、使用的技术栈:

1、nginx

2、ffmpeg

3、asp.net framework4.5 winfrom

4、开发工具vs2019

5、开发语言c#

关于以上技术大体做下说明，使用nginx做为代理节点服务器，基于ffmpeg做推流，asp.net framework4.5 winfrom 做为桌面应用。很多人比较陌生的可能是ffmpeg,把它理解为视频处理最常用的开源软件。关于它的更多详细文章可以去看阮一峰对它的介绍。“FFmpeg 视频处理入门教程”。

5.1启动nginx的核心代码

using System;
using System.Diagnostics;
using System.IO;
using System.Windows.Forms;

namespace MnNiuVideoApp
{
    public class NginxProcess
    {
        //nginx的进程名
        public string _nginxFileName = "nginx";
        public string _stop = "stop.bat";
        public string _start = "start.bat";
        //nginx的文件路径名
        public string _nginxFilePath = string.Empty;
        //nginx的启动参数
        public string _arguments = string.Empty;
        //nginx的工作目录
        public string _workingDirectory = string.Empty;
        public int _processId = 0;
        public NginxProcess()
        {
            string basePath = FileHelper.LoadNginxPath();
            string nginxPath = $@"{basePath}\nginx.exe";
            _nginxFilePath = Path.GetFullPath(nginxPath);
            _workingDirectory = Path.GetDirectoryName(_nginxFilePath);
            _arguments = @" -c \conf\nginx-win.conf";
        }
        //关掉所有nginx的进程,格式必须这样，有空格存在  taskkill /IM  nginx.exe  /F

        /// <summary>
        /// 启动服务
        /// </summary>
        /// <returns></returns>
        public void StartService()
        {
            try
            {
                if (ProcessesHelper.IsCheckProcesses(_nginxFileName))
                {
                    LogHelper.WriteLog("nginx进程已经启动过了");
                }
                else
                {
                    var sinfo = new ProcessStartInfo
                    {
                        FileName = _nginxFilePath,
                        Verb = "runas",
                        WorkingDirectory = _workingDirectory,
                        Arguments = _arguments
                    };
#if DEBUG
                    sinfo.UseShellExecute = true;
                    sinfo.CreateNoWindow = false;
#else
                sinfo.UseShellExecute = false;
#endif
                    using (var process = Process.Start(sinfo))
                    {
                        //process?.WaitForExit();
                        _processId = process.Id;
                    }
                }
            }
            catch (Exception e)
            {
                LogHelper.WriteLog(e.Message);
                MessageBox.Show(e.Message);
            }

        }

        /// <summary>
        /// 关闭nginx所有进程
        /// </summary>
        /// <returns></returns>
        public void StopService()
        {
            ProcessesHelper.KillProcesses(_nginxFileName);
        }



        /// <summary>
        /// 需要以管理员身份调用才能起作用
        /// </summary>
        public void KillAll()
        {
            try
            {
                ProcessStartInfo sinfo = new ProcessStartInfo();
#if DEBUG
                sinfo.UseShellExecute = true;
                // sinfo.CreateNoWindow = true;
#else
                sinfo.UseShellExecute = false;
#endif
                sinfo.FileName = _nginxFilePath;
                sinfo.Verb = "runas";
                sinfo.WorkingDirectory = _workingDirectory;
                sinfo.Arguments = $@"{_workingDirectory}\taskkill /IM  nginx.exe  /F ";
                using (Process _process = Process.Start(sinfo))
                {
                    _processId = _process.Id;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}

5.2启动ffmpeg进程的核心代码

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace MnNiuVideoApp
{
    public class VideoProcess
    {
        private static string _ffmpegPath = string.Empty;
        static VideoProcess()
        {
            _ffmpegPath = FileHelper.LoadFfmpegPath();
        }
        /// <summary>
        /// 调用ffmpeg.exe 执行命令
        /// </summary>
        /// <param name="Parameters">命令参数</param>
        /// <returns>返回执行结果</returns>
        public static void Run(string parameters)
        {

            // 设置启动参数
            ProcessStartInfo startInfo = new ProcessStartInfo();

            startInfo.Verb = "runas";
            startInfo.FileName = _ffmpegPath;
            startInfo.Arguments = parameters;
#if DEBUG
            startInfo.CreateNoWindow = false;
            startInfo.UseShellExecute = true;
            //将输出信息重定向
            //startInfo.RedirectStandardOutput = true;
#else

            //设置不在新窗口中启动新的进程
            startInfo.CreateNoWindow = true;
            //不使用操作系统使用的shell启动进程
            startInfo.UseShellExecute = false;
#endif
            using (var proc = Process.Start(startInfo))
            {
                proc?.WaitForExit(3000);
            }
            //finally
            //{
            //    if (proc != null && !proc.HasExited)
            //    {
            //        //"即将杀掉视频录制进程,Pid:{0}", proc.Id));
            //        proc.Kill();
            //        proc.Dispose();
            //    }
            //}
        }
    }
}

5.3 窗体里面事件的核心代码

using MnNiuVideoApp.Common;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MnNiuVideo
{
    public partial class PlayerForm : Form
    {
        public PlayerForm()
        {
            InitializeComponent();
            new NginxProcess().StopService();
            //获取本机所有相机
            var cameras = CameraUtils.ListCameras();
            if (toolStripComboBox1.ComboBox != null)
            {
                var list = new List<string>() { "--请选择相机--" };
                foreach (var item in cameras)
                {
                    list.Add(item.FriendlyName);
                }
                toolStripComboBox1.ComboBox.DataSource = list;
            }
        }
        TstRtmp rtmp = new TstRtmp();
        Thread thPlayer;
        private void StartPlayStripMenuItem_Click(object sender, EventArgs e)
        {
            StartPlayStripMenuItem.Enabled = false;
            TaskScheduler uiContext = TaskScheduler.FromCurrentSynchronizationContext();
            Task t = Task.Factory.StartNew(() =>
            {
                if (thPlayer != null)
                {
                    rtmp.Stop();
                    thPlayer = null;
                }
                else
                {
                    string path = FileHelper.GetLoadPath();
                    pic.Image = Image.FromFile(path);
                    thPlayer = new Thread(DeCoding)
                    {
                        IsBackground = true
                    };
                    thPlayer.Start();

                    StartPlayStripMenuItem.Text = "停止播放";
                    //StartPlayStripMenuItem.Enabled = true;
                }
            }).ContinueWith(m =>
            {
                StartPlayStripMenuItem.Enabled = true;
                Console.WriteLine("任务结束");
            }, uiContext);

        }

        /// <summary>
        /// 播放线程执行方法
        /// </summary>
        private unsafe void DeCoding()
        {
            try
            {
                Console.WriteLine("DeCoding run...");
                Bitmap oldBmp = null;
                // 更新图片显示
                TstRtmp.ShowBitmap show = (bmp) =>
                {
                    this.Invoke(new MethodInvoker(() =>
                    {
                        if (this.pic.Image != null)
                        {
                            this.pic.Image = null;
                        }

                        if (bmp != null)
                        {
                            this.pic.Image = bmp;
                        }
                        if (oldBmp != null)
                        {
                            oldBmp.Dispose();
                        }
                        oldBmp = bmp;
                    }));
                };
                //线程间操作无效
                var url = string.Empty;
                this.Invoke(new Action(() =>
                {
                    url = PlayAddressComboBox.Text.Trim();
                }));

                if (string.IsNullOrEmpty(url))
                {
                    MessageBox.Show("播放地址为空!");
                    return;
                }
                rtmp.Start(show, url);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            finally
            {
                Console.WriteLine("DeCoding exit");
                rtmp?.Stop();
                thPlayer = null;
                this.Invoke(new MethodInvoker(() =>
                {
                    StartPlayStripMenuItem.Text = "开始播放";
                    StartPlayStripMenuItem.Enabled = true;
                }));
            }
        }




        private void DesktopRecordStripMenuItem_Click(object sender, EventArgs e)
        {
            var path = FileHelper.VideoRecordPath();
            if (string.IsNullOrEmpty(path))
            {
                MessageBox.Show("视频存放文件路径为空");
            }
            string args = $"ffmpeg -f gdigrab -r 24 -offset_x 0 -offset_y 0 -video_size 1920x1080 -i desktop -f dshow -list_devices 0 -i video=\"Integrated Webcam\":audio=\"麦克风(Realtek Audio)\" -filter_complex \"[0:v] scale = 1920x1080[desktop];[1:v] scale = 192x108[webcam];[desktop][webcam] overlay = x = W - w - 50:y = H - h - 50\" -f flv \"rtmp://127.0.0.1:20050/myapp/test\" -map 0 {path}";
            VideoProcess.Run(args);
            StartLiveToolStripMenuItem.Text = "正在直播";
        }

        private void LiveRecordStripMenuItem_Click(object sender, EventArgs e)
        {
            var path = FileHelper.VideoRecordPath();
            if (string.IsNullOrEmpty(path))
            {
                MessageBox.Show("视频存放文件路径为空");
            }
            var args = $" -f dshow -re -i  video=\"Integrated Webcam\" -tune zerolatency -vcodec libx264 -preset ultrafast -b:v 400k -s 704x576 -r 25 -acodec aac -b:a 64k -f flv \"rtmp://127.0.0.1:20050/myapp/test\" -map 0 {path}";
            VideoProcess.Run(args);
            StartLiveToolStripMenuItem.Text = "正在直播";
        }
        /// <summary>
        /// 开始直播（服务端开始推流）
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void StartLiveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {

                if (toolStripComboBox1.ComboBox != null)
                {
                    string camera = toolStripComboBox1.ComboBox.SelectedText;
                    if (string.IsNullOrEmpty(camera))
                    {
                        MessageBox.Show("请选择要使用的相机");
                        return;
                    }
                    var path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Icon");
                    var imgPath = Path.Combine(path + "\\", "stop.jpg");
                    StartLiveToolStripMenuItem.Enabled = false;

                    StartLiveToolStripMenuItem.Image = Image.FromFile(imgPath);
                    string args = $" -f dshow -re -i  video=\"{camera}\" -tune zerolatency -vcodec libx264 -preset ultrafast -b:v 400k -s 704x576 -r 25 -acodec aac -b:a 64k -f flv \"rtmp://127.0.0.1:20050/myapp/test\"";
                    VideoProcess.Run(args);
                }

                StartLiveToolStripMenuItem.Text = "正在直播";
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void PlayerForm_Load(object sender, EventArgs e)
        {
            // if (toolStripComboBox1.ComboBox != null) toolStripComboBox1.ComboBox.SelectedIndex = 0;
        }

        private void PlayerForm_FormClosed(object sender, FormClosedEventArgs e)
        {
            this.Dispose();
            this.Close();
        }

        private void PlayerForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult dr = MessageBox.Show("您是否退出?", "提示:", MessageBoxButtons.OKCancel, MessageBoxIcon.Information);

            if (dr != DialogResult.OK)
            {
                if (dr == DialogResult.Cancel)
                {
                    e.Cancel = true; //不执行操作
                }
            }
            else
            {
                new NginxProcess().StopService();
                Application.Exit();
                e.Cancel = false; //关闭窗体
            }
        }
    }
}

6、界面展示：

三、目前实现的功能

winfrom桌面播放（拉流）

推流(直播)

(直播)推流录屏

....想到再加上去

四、如何使用

克隆或下载程序后可以使用vs打开解决方案 、然后选择debug或relase方式进行编译，建议relase,编译后的软件在Bin\debug|relase目录下。

双击Bin\debug|relase目录下 MnNiuVideo.exe 即可运行起来。

软件打开后，选择本机相机（如果本机有多个相机任意选一个）、点击开始直播(推流)，然后点击开始播放(拉流)。

关于其他问题或者详细介绍建议直接看源码。

五、最后

可能一眼看去UI比较丑，多年没有使用过winfrom,其实winform本身控件开发的界面就比较丑，界面这块不属于核心，也可以使用web端拉流，手机端拉流，都是可行的。所用技术略有差别。另外，代码这块目前也谈不上多么规范，请轻拍，后期抽时间部分代码都会进行整合调整。后面想到的功能会定期更新，长期维护。软件纯绿色版，基于MIT协议开源，也可自行修改。

源码地址:

码云:https://gitee.com/shenniu_code_group/mn-niu-video

github:https://github.com/realyrare/MnNiuVideo