入门WebRTC实时点对点通信指南

5星 · 超过95%的资源需积分: 10 147 浏览量更新于2024-07-22 3 收藏 1.27MB PDF 举报

"Getting Started with WebRTC" 是一本专为想要深入理解并掌握实时点对点通信技术 WebRTC 的读者精心编写的指南。WebRTC（Web Real-Time Communication）是一种由 Google 开发的开源项目，旨在让网页浏览器和其他设备之间能够进行高质量的音视频通信，无需依赖第三方插件或服务器中介。本书由 Rob Manson 编著，版权归属于 Packt Publishing，提供了一种系统的学习路径，适合初学者和进阶开发者。本书涵盖了WebRTC的基础知识，包括但不限于以下内容： 1. **入门介绍**：章节详细解释了WebRTC的背景、原理和目标，帮助读者理解它在现代网络通信中的核心地位。 2. **环境配置**：讲解如何在开发环境中设置WebRTC支持，包括浏览器兼容性、API版本管理和必要的库安装。 3. **关键技术组件**：剖析了关键组件如getUserMedia API、RTCPeerConnection、DataChannel等，展示了如何创建基本的音频和视频通话功能。 4. **媒体流处理**：涉及媒体编码、解码和流媒体传输的技术，以及如何优化带宽利用和处理网络不稳定情况。 5. **信令与协商**：讨论了ICE (Interactive Connectivity Establishment) 和STUN (Session Traversal Utilities for NAT) 等机制，如何在防火墙和NAT环境下建立和维护连接。 6. **高级功能**：探讨了WebRTC的扩展特性，如屏幕共享、视频编码器选择、多点通信等，并提供了实战示例。 7. **安全性与隐私**：讨论了WebRTC的安全挑战，包括数据加密和用户隐私保护措施。 8. **跨平台实现**：指导读者如何将WebRTC应用部署到不同的客户端，如桌面浏览器、移动设备和嵌入式设备。 9. **最佳实践与性能优化**：分享了开发过程中可能遇到的问题及其解决方案，以及如何提升WebRTC应用的性能和用户体验。 10. **案例研究与实战项目**：书中可能包含实际项目的代码示例，让读者通过实践巩固理论知识。虽然作者和出版社努力确保信息的准确性，但读者需明白，书中的内容可能会随着时间和技术发展而更新，因此在阅读时也应关注官方文档和最新技术更新。"Getting Started with WebRTC" 是一个全面且实用的资源，无论是对构建实时通信应用的工程师还是希望了解这项技术原理的读者来说，都是一个不可或缺的参考资料。

Preface

[ 5 ]

Piracy

Piracy of copyright material on the Internet is an ongoing problem across all media.

At Packt, we take the protection of our copyright and licenses very seriously. If you

come across any illegal copies of our works, in any form, on the Internet, please

provide us with the location address or website name immediately so that we can

pursue a remedy.

Please contact us at

pirated material.

We appreciate your help in protecting our authors, and our ability to bring you

valuable content.

Questions

You can contact us at questions@packtpub.com if you are having a problem

with any aspect of the book, and we will do our best to address it.

An Introduction to Web-based Real-Time Communication

[ 8 ]

Now the web is undergoing yet another transformation that enables individual web

browsers to stream data directly to each other without the need for sending it via

intermediary servers. This new form of peer-to-peer communication is built upon

a new set of APIs that is being standardized by the Web Real-Time Communications

Working Group available at http://www.w3.org/2011/04/webrtc/ of the World

Wide Web Consortium (W3C), and a set of protocols standardized by Real-Time

Communication in WEB-browsers Working Group available at http://tools.ietf.

org/wg/rtcweb/

of the Internet Engineering Task Force (IETF).

Just as the introduction of the XHR API led to the Web 2.0 revolution, the

introduction of the new WebRTC standards is creating a new revolution too.

It's time to say hello to the real-time web!

Uses for WebRTC

The real-time web allows you to set up dynamic connections to other web browsers

and web-enabled devices quickly and easily. This opens the door to a whole new

range of peer-to-peer communication, including text-based chat, le sharing, screen

sharing, gaming, sensor data feeds, audio calls, video chat, and more. You can now

see that the implications of WebRTC are very broad. Direct and secure peer-to-

peer communication between browsers will have a big impact on the modern web,

reshaping the way we use the physical networks that make up the Internet.

Direct peer-to-peer connections often provide lower latency, making gaming,

video streaming, sensor data feeds, and so on, appear faster and more interactive

or real-time, hence the use of this term.

Secure peer-to-peer connections allow you to exchange information privately

without it being logged or managed by intermediary servers. This reduces the

need for some large service providers while creating opportunities for people to

create new types of services and applications. It introduces improved privacy for

some individuals while it may also create new complexities for regulators and law

enforcement organizations.

And the efcient peer-to-peer exchange of binary data streams removes the need to

serialize, re-encode, or convert this data at each step in the process. This leads to a

much more efcient use of network and application resources, as well as creating a

less error prone and more robust data exchange pipeline.

This is just a brief overview of how you can use WebRTC, and by the end of this

book, you will have all the information you need to start turning your own new

ideas into practical applications.

Chapter 1

[ 9 ]

Try WebRTC yourself right now!

The goal of this book is to get you started with WebRTC, so let's do that right now.

You can easily nd out if your browser supports the camera access functionality

by visiting one of the existing demo sites such as http://www.simpl.info/

getusermedia

, and if it does, you should be prompted to provide permission to

share your camera. Once you provide this permission, you should see a web page

with a live video stream from your PC or mobile devices' video camera, and be

experiencing the interesting sensation of looking at a video of yourself staring right

back at you. That's how simple it is to start using WebRTC.

Now, perhaps you'd like to try using it to communicate with another person. You

can do this by visiting another demo site such as

http://apprtc.appspot.com,

which will create a unique URL for your video chat. Just send this URL to another

person with a browser that also supports WebRTC, and once they open that page,

you should see two video elements displayed on the page: one from your local

video camera and one from the other person's video camera. There's a lot of complex

negotiation that's gone on in the background, but assuming your browser supports

WebRTC and your network doesn't actively prevent it, then you should now have a

clear idea of just how easy it is to use.

But what web browsers support WebRTC? Let's nd out.

Browser compatibility

The WebRTC standards landscape is home to one of the fastest evolving communities

on the web. One of the biggest challenges this creates is that of compatibility and

interoperability. Here is an overview of what this is up to today and how to stay

up-to-date as this continues to evolve.

Chrome and Firefox on the PC

At the time this chapter was written, WebRTC was supported as default by Chrome

and Firefox on mainstream PC Operating Systems such as Mac OS X, Windows, and

Linux. And most importantly, these two key implementations have been shown to

communicate well with each other through a range of interoperability tests.

Have a look at the Hello Chrome, it's Firefox calling! blog post at

https://hacks.mozilla.org/2013/02/hello-chrome-

its-firefox-calling/.

剩余113页未读，继续阅读

keny夏

粉丝: 0
资源: 3

入门WebRTC实时点对点通信指南

快速入门WebRTC：实现实时通信技术

探索WebRTC：实时浏览器通信入门

WebRTC实时通信入门指南

Getting Started with WebRTC 无水印pdf

[Packt Publishing] Getting Started with WebRTC

Getting Started with WebRTC - HTML5 Rocks

Getting-Started-with-Webrtc-2013-Rob-Manson.pdf

WebRTC.rar

[WebRTC] WebRTC 入门教程 (英文版)

webrtc相关资料.rar

最新资源