Workerman development: How to implement a video live broadcast system based on WebSocket protocol-Workerman-php.cn

Workerman development: How to implement a video live broadcast system based on WebSocket protocol

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Release： 2023-11-07 11:25:01

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Workerman development: How to implement a video live broadcast system based on WebSocket protocol

Workerman is a high-performance PHP framework that can achieve tens of millions of concurrent connections through asynchronous non-blocking I/O. It is suitable for real-time communication, high-concurrency servers and other scenarios. In this article, we will introduce how to use the Workerman framework to develop a live video system based on the WebSocket protocol, including building services, implementing push and reception of live video streams, display of front-end pages, etc.

1. Build the server

1. Install the Workerman dependency package:

Run the following command to install the Workerman dependency package:

composer require workerman/workerman

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2. Create a service End

Create a workerman.php file as our server code. The code is as follows:

<?php
use WorkermanWorker;
use WorkermanLibTimer;

require_once __DIR__ . '/vendor/autoload.php';

// 创建一个Worker监听2345端口，使用websocket协议通讯
$worker = new Worker("websocket://0.0.0.0:2345");

// 启动4个进程对外提供服务
$worker->count = 4;

// 客户端连接时触发
$worker->onConnect = function($connection) {
    echo "New client connected!
";
};

// 客户端请求时触发
$worker->onMessage = function($connection, $data) {
    if(strpos($data, 'start') === 0) {
        // 该客户端请求直播视频流
        $connection->send(getVideoStream());
        // 启动定时器，每秒向客户端发送一份视频流
        $timer_id = Timer::add(1, function()use($connection){
            $connection->send(getVideoStream());
        });
        // 将定时器ID绑定到连接上，方便后续停止定时器
        $connection->timer_id = $timer_id;
    }
    else if(strpos($data, 'stop') === 0) {
        // 该客户端停止请求直播视频流
        Timer::del($connection->timer_id);
    }
    else {
        // 其他请求，直接返回响应
        $connection->send("Hello, $data!");
    }
};

// 客户端断开连接时触发
$worker->onClose = function($connection) {
    // 清除定时器
    Timer::del($connection->timer_id);
    echo "Client disconnected!
";
};

// 以下是获取直播视频流的代码，可以替换为你自己的视频流获取代码
function getVideoStream() {
    $fp = fopen("videos/video.mp4", "rb");
    $chunk_size = 1024*1024; // 每次读取1MB
    $buffer = "";
    while(!feof($fp)) {
        $buffer .= fread($fp, $chunk_size);
        ob_flush();
        flush();
    }
    fclose($fp);
    return $buffer;
}

// 运行worker
Worker::runAll();

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In the above code, we create a Worker object named worker and listen to port 2345 to communicate using the websocket protocol. In the onMessage callback function, if the client sends a "start" message, it means that the client wants to request a live video stream. We obtain the video stream through the getVideoStream function and use a timer to push a video stream data to the client every second. If the client sends a "stop" message, it means that the client stops requesting the live video stream, and we close the timer corresponding to the connection. Other requests return responses directly.

2. Create a video file

We create a videos folder in the root directory and add a video file named video.mp4 in it. This video file can be replaced with your own live video stream.

3. Start the server

Enter the directory where workerman.php is located on the command line, and run the following command to start the server:

php workerman.php start

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After successful startup, the server It is listening on port 2345 and can receive requests from clients.

2. Implement the client

1.Introduce socket.io and video.js

We use the two libraries socket.io and video.js to implement the client function. These two libraries need to be introduced into the html page.

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Video live demo</title>
    <style>
        video {
            width: 800px;
            height: 600px;
        }
    </style>
</head>

<body>
    <h1>Video live demo</h1>
    <button id="start">Start live</button>
    <button id="stop">Stop live</button>
    <br/><br/>
    <video id="video-player" class="video-js vjs-default-skin"></video>

    <script src="https://cdn.bootcss.com/socket.io/3.1.3/socket.io.js"></script>
    <link href="https://cdn.bootcss.com/video.js/7.15.4/video-js.min.css" rel="stylesheet">
    <script src="https://cdn.bootcss.com/video.js/7.15.4/video.min.js"></script>
    <script>
        var socket = io('http://localhost:2345');
        var player = videojs('video-player');

        // 点击开始按钮，向服务端发起请求获取视频流
        document.querySelector('#start').addEventListener('click', function() {
            socket.send('start');
        });
        // 点击结束按钮，停止请求视频流
        document.querySelector('#stop').addEventListener('click', function() {
            socket.send('stop');
            player.pause();
        });
        // 收到服务端推送的视频流数据，开始播放视频
        socket.on('message', function(data) {
            player.src({ type: 'video/mp4', src: URL.createObjectURL(new Blob([data], { type: 'video/mp4' })) });
            player.play();
        });
    </script>
</body>
</html>

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In the above code, we created a simple html page, including a start button, an end button and a video player. When the start button is clicked, a "start" message is sent to the server to request the video stream. When the end button is clicked, a "stop" message is sent to the server to stop requesting the video stream and pause video playback. When receiving the video stream data pushed by the server, we use the URL.createObjectURL function to create a video stream URL and pass the URL to the video.js player for playback.

2. Start the client

Visit the above html page in the browser and click the start button to start playing the live video stream. Click the Stop button to stop requesting the video stream and pause video playback.

Summary

By using the Workerman framework and WebSocket protocol, we can easily implement a high-performance, low-latency video live broadcast system. Workerman provides asynchronous non-blocking I/O support and can quickly handle scenarios where millions of connections are accessed simultaneously, bringing great convenience to real-time communications, high-concurrency servers and other fields. In this article, we use Workerman's asynchronous communication capabilities to push and receive real-time video streams between the server and the client, making the live broadcast system more smooth and efficient.

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