Workerman development: How to implement real-time voice calls based on UDP protocol

Workerman Development: Real-time voice calls based on UDP protocol

With the continuous advancement of technology, real-time voice calls have become an indispensable part of life. The traditional voice call implementation method based on the TCP protocol is no longer suitable for modern and rapidly developing communication needs due to its shortcomings such as high latency and large bandwidth usage. Therefore, what we usually use now are real-time voice call applications based on UDP protocol.

Workerman is a PHP framework for developing high-performance applications, suitable for game servers, real-time communication servers, Internet of Things servers and other fields. This article will introduce how to use Workerman to develop a real-time voice call application based on UDP protocol, and provide specific code examples.

1. Advantages of UDP protocol

The biggest difference between UDP protocol and TCP protocol is that it does not guarantee the reachability and order of data packets. Therefore, the UDP protocol has the following advantages over the TCP protocol:

1. Efficiency: Because the UDP protocol does not guarantee reachability and order, it does not need to perform operations such as connection management and data packet retransmission. This Just make it appear more efficient.
2. Low latency: Under the same network conditions, the latency of UDP protocol is much lower than that of TCP protocol.
3. Suitable for real-time applications: Real-time applications based on UDP protocol, such as voice calls, live video broadcasts, etc., can obtain a better user experience.

2. Implementation steps

Using Workerman to develop a real-time voice call application based on the UDP protocol requires the following steps:

1. Create a UDP service

The code to create a UDP service using Workerman is as follows:

use WorkermanWorker;

$worker = new Worker('udp://0.0.0.0:60000');

In the above code, we created a UDP service named $worker and specified its listening port number as 60000.

2. Process the received data

The code for using Workerman to process the received data is as follows:

$worker->onMessage = function ($connection, $data) {
    echo "收到客户端的数据：" . $data . "
";
};

In the above code, we use the onMessage callback provided by Workerman function, when a client sends data to the server, the function will be automatically called back, and then we can process the received data in this function.

3. Send data to the client

The code to use Workerman to send data to the client is as follows:

$worker->onMessage = function ($connection, $data) {
    // 处理收到的数据
    // ......
    // 发送数据给客户端
    $connection->send("Hello Client!");
};

In the above code, we can use the send method of the $connection object Send data to the client.

4. Client

The client is the application that sends sound data to the server and receives data from the server. The code for developing the client using Workerman is as follows:

use WorkermanConnectionAsyncUdpConnection;

$udp_connection = new AsyncUdpConnection('udp://127.0.0.1:60000');

// 当UDP连接建立成功时触发
$udp_connection->onConnect = function () use ($udp_connection) {
    // 发送数据给服务器
    $udp_connection->send('Hello Server!');
};

// 当收到服务器数据时触发
$udp_connection->onMessage = function($udp_connection, $data) use(&$callback)
{
    // 处理服务器数据
    // ......
};

$udp_connection->connect();

In the above code, we create a UDP connection named $udp_connection and specify its target IP and port number as 127.0.0.1:60000. We use the onConnect callback function of the $udp_connection object to send data to the server after the connection is successful, and use the onMessage callback function to process the data returned by the server.

3. Complete code example

The following is a complete real-time voice call application example code based on UDP protocol:

Server:

use WorkermanWorker;

// 创建一个UDP服务
$worker = new Worker('udp://0.0.0.0:60000');

// 处理客户端发送的数据
$worker->onMessage = function ($connection, $data) {
    // 处理收到的数据
    // ......
    // 发送数据给客户端
    $connection->send($data);
};

// 运行worker
Worker::runAll();

Customer End:

use WorkermanConnectionAsyncUdpConnection;

$udp_connection = new AsyncUdpConnection('udp://127.0.0.1:60000');

// 当UDP连接建立成功时触发
$udp_connection->onConnect = function () use ($udp_connection) {
    // 发送数据给服务器
    $udp_connection->send(file_get_contents('audio.wav'));
};

// 当收到服务器数据时触发
$udp_connection->onMessage = function($udp_connection, $data) use(&$callback)
{
    // 处理服务器数据
    // ......
    file_put_contents('audio.wav', $data);
};

$udp_connection->connect();

In the above code, we use the file_get_contents function on the client to read the local audio file and send it to the server via UDP. On the server side, after we receive the audio data from the client, we directly return the data to the client. After the client receives the data, it stores the data in a local file.

4. Summary

This article introduces how to use Workerman to develop a real-time voice call application based on UDP protocol, and provides specific code examples. Through this article, we have learned about the advantages of the UDP protocol and the implementation steps based on the UDP protocol. I believe this will be helpful to developers who develop real-time voice call applications. If you have a better implementation or other questions, please leave a message in the comment area.

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