nodejs implements dlan

DLNA (Digital Internet Network Alliance) is an organization composed of consumer electronics, computer and mobile device companies, dedicated to developing digital multimedia standard protocols so that consumers can share and stream using various devices on their home networks. to transmit multimedia content. Using DLNA technology, users can stream audio, video and photos on various devices to enjoy a unique multimedia experience.

In this article, we will introduce how to use Node.js to implement DLNA. We'll learn how to use Node.js to build DLNA servers and clients for sharing and streaming media content over the network.

1. DLNA Introduction

DLNA is a technology based on the standard Internet protocol stack, which allows users to transmit media content between different devices, such as: smart TVs, games machines, mobile phones, audio and video systems, etc.

DLNA has three important roles:

• DLNA Server: Responsible for storing media content, such as music, videos, and photos.
• DLNA Renderer: Can play media content from a DLNA server and render it to a screen or audio device.
• DLNA controller: used to control the DLNA renderer and server to perform operations, such as play, pause, stop, etc.

2. DLNA Server

In Node.js, we can use the upnp-device-js module to implement the DLNA server. upnp-device-js is a simple and easy-to-use UPnP device and service library, which allows us to easily create devices and services that comply with the UPnP specification.

First, we need to install the upnp-device-js module:

npm install upnp-device-js

Next, we need to create a DLNA server and add media services to it. The following is a simple example:

var UPnPAV = require('upnp-av').UPnPAV;
var UPnPDevice = require('upnp-device-js').UPnPDevice;

var device_def = {
    deviceType: 'MediaServer',
    friendlyName: 'My DLNA Server',
    manufacturer: 'My Company',
    modelName: 'My Model',
    modelNumber: '1.0',
    UDN: 'uuid:1234'
};

var device = new UPnPDevice(device_def);

var mediaServer = new UPnPAV(mediaServerOptions(device_def));

device.addService(mediaServer.service);

function mediaServerOptions(deviceDef) {
  return {
    friendlyName: deviceDef.friendlyName,
    manufacturer: deviceDef.manufacturer,
    modelName: deviceDef.modelName,
    modelNumber: deviceDef.modelNumber,
    UDN: deviceDef.UDN,
    mediaFolders: [
      '/path/to/my/music',
      '/path/to/my/videos',
      '/path/to/my/photos'
    ]
  };
}

device.start();

In this example, we first define the device type, friendly name, manufacturer, model and other attributes of the DLNA server. We then created a UPnPDevice object and added the media service to it.

Media services use the UPnPAV module to provide audio, video and photo services. We can define a directory of media files and add them to the media service.

Finally, we use the device.start() method to start the DLNA server.

3. DLNA renderer

In Node.js, we can use the upnp-device-js module to implement the DLNA renderer. Again, we need to install the upnp-device-js module:

npm install upnp-device-js

Next, we need to create a DLNA renderer and add the media renderer service to it. The following is a simple example:

var UPnPAV = require('upnp-av').UPnPAV;
var UPnPDevice = require('upnp-device-js').UPnPDevice;

var device_def = {
    deviceType: 'MediaRenderer',
    friendlyName: 'My DLNA Renderer',
    manufacturer: 'My Company',
    modelName: 'My Model',
    modelNumber: '1.0',
    UDN: 'uuid:5678'
};

var device = new UPnPDevice(device_def);

var mediaRenderer = new UPnPAV(mediaRendererOptions(device_def));

device.addService(mediaRenderer.service);

function mediaRendererOptions(deviceDef) {
  return {
    friendlyName: deviceDef.friendlyName,
    manufacturer: deviceDef.manufacturer,
    modelName: deviceDef.modelName,
    modelNumber: deviceDef.modelNumber,
    UDN: deviceDef.UDN,
    audioSupported: true,
    videoSupported: false
  };
}

device.start();

In this example, we first define the device type, friendly name, manufacturer, model and other properties of the DLNA renderer. We then created a UPnPDevice object and added the media renderer service to it.

The media renderer service uses the UPnPAV module to provide audio and video services. We can define whether the renderer supports audio and video and add it to the media renderer service.

Finally, we use the device.start() method to start the DLNA renderer.

4. DLNA Controller

In Node.js, we can use the dlna-control module to implement the DLNA controller. This module can help us control DLNA devices, such as starting playback, stopping, pausing, obtaining device information, etc.

First, we need to install the dlna-control module:

npm install dlna-control

The following is a simple example demonstrating how to use the dlna-control module to control a DLNA device.

var dlna = require('dlna-control');

// 获取DLNA设备列表
dlna.getDeviceList(function(err, list) {
  if(err) {
    console.error(err);
    return;
  }

  console.log('设备列表：');
  console.log(list);

  // 选择一个设备控制
  var device = list[0];

  // 向设备发送命令
  dlna.play(device, function(err, status) {
    if(err) {
      console.error(err);
      return;
    }

    console.log('状态：', status);
  });
});

In this example, we first use the dlna.getDeviceList() method to get the DLNA device list, and then select a device to control.

Next, we use the dlna.play() method to play media content.

The DLNA controller provides a series of commands, such as start, pause, stop, etc., which can be called through the dlna module.

5. Summary

This article introduces how to use Node.js to implement DLNA servers, renderers and controllers. These components can help us build a complete DLNA system for sharing and transmitting audio, video and photo content on a variety of devices.

Node.js is a powerful platform that can be used to build various types of applications, including DLNA applications. I hope this article helped you understand how to implement DLNA using Node.js.

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