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Learning WebRTC 无水印pdf.pdf

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    Cover
    Copyright
    About the Author
    Table of Contents
    Preface
    1: Getting Started with WebRTC
    Audio and video communication today
    Enabling audio and video on the Web
    Camera and microphone capture
    Encoding and decoding audio and video
    Transportation layer
    Session management
    Creating web standards
    Browser support
    Compatibility with Chrome, Firefox, and Opera
    Compatibility with Android OS
    Compatibilty with Apple
    Compatibility with Internet Explorer
    Using WebRTC in your browser
    Applications enabled by WebRTC
    Self-test questions
    Summary
    2: Getting the User's Media
    Getting access to media devices
    Setting up a static server
    Creating our first MediaStream page
    Constraining the media stream
    Constraining the video capture
    Handling multiple devices
    Creating a photo booth application
    Modifying the media stream
    Self-test questions
    Summary
    3: Creating a Basic WebRTC Application
    Understanding UDP transport and real-time transfer
    The WebRTC API
    The RTCPeerConnection object
    Signaling and negotiation
    Session Description Protocol
    Finding a clear route to another user
    Session Traversal Utilities for NAT
    Traversal Using Relays around NAT
    Interactive Connectivity Establishment
    Building a basic WebRTC application
    Creating a RTCPeerConnection
    Creating the SDP offer and response answer
    Finding ICE candidates
    Adding streams and polishing
    Running your first WebRTC application
    Self-test questions
    Summary
    4: Creating a Signaling Server
    Building a signaling server
    Setting up our environment
    Getting a connection
    Testing our server
    Identifying users
    Initiating a call
    Answering a call
    Handling ICE candidates
    Hanging up a call
    Complete signaling server
    Signaling in the real world
    The woes of WebSockets
    Connecting with other services
    XMPP
    Session Initiation Protocol
    Self-test questions
    Summary
    5: Connecting Clients Together
    The client application
    Setting up the page
    Getting a connection
    Logging in to the application
    Starting a peer connection
    Initiating a call
    Inspecting the traffic
    Hanging up a call
    A complete WebRTC client
    Improving the application
    Self-test questions
    Summary
    6: Sending Data with WebRTC
    Stream Control Transmission Protocol and data transportation
    The RTCDataChannel object
    Data channel options
    Sending data
    Encryption and security
    Adding text-based chat
    Use cases
    Self-test questions
    Summary
    7: File Sharing
    Getting a file with the File API
    Setting up our page
    Getting a reference to a file
    Breaking down a file into chunks
    Making chunks readable
    Reading and sending the file
    Putting it together on the other side
    Showing progress to the user
    Self-test questions
    Summary
    8: Advanced Security and Large-scale Optimization
    Securing the signaling server
    Using encryption
    Using an OAuth provider
    Supporting mobile devices
    Introduction to mesh networking
    Types of network meshes
    Everyone to everyone
    Star network
    Partial mesh
    Limits of mesh networking
    Video conferencing with more users
    The future of conference calls
    Self-test questions
    Summary
    Appendix: Answers to Self-test Questions
    Chapter 1, Getting Started with WebRTC
    Chapter 2, Getting the User's Media
    Chapter 3, Creating a Basic WebRTC Application
    Chapter 4, Creating a Signaling Server
    Chapter 5, Connecting Clients Together
    Chapter 6, Sending Data with WebRTC
    Chapter 7, File Sharing
    Chapter 8, Advanced Security and Large-scale Optimization
    Index
    Learning WebRTC Develop interactive real-time communication applications with WebRTC Dan Ristic BIRMINGHAM - MUMBAI
    Learning WebRTC Copyright © 2015 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: June 2015 Production reference: 1250615 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-78398-366-7 www.packtpub.com
    Credits Project Coordinator Bijal Patel Proofreader Safis Editing Indexer Monica Ajmera Mehta Graphics Disha Haria Production Coordinator Conidon Miranda Cover Work Conidon Miranda Author Dan Ristic Reviewers Roy Binux Tsahi Levent-Levi Andrii Sergiienko Commissioning Editor Andrew Duckworth Acquisition Editor Nikhil Karkal Content Development Editor Manasi Pandire Technical Editor Rahul C. Shah Copy Editors Sonia Michelle Cheema Swati Priya Neha Vyas
    About the Author Dan Ristic is a frontend engineer and evangelist for Open Web. He strives to push the Web forward with new and creative ideas using the latest technologies. He attended the University of Advancing Technology, Arizona, where he furthered his engineering knowledge and fueled his passion for the Web. He has been writing applications on the Web ever since. He currently lives and works in San Francisco as a senior software engineer at Sony Network Entertainment International. At Sony, he is responsible for managing the frontend application architecture and delivering the PlayStation Store to millions of users. In his free time, he can be found hiking, exploring, working on projects, and attending events. I would like to thank my family for their never-ending support, motivation, and encouragement in everything I do. I would also like to thank my friends for the innumerable cups of coffee and their help to keep me on track.
    About the Reviewers Roy Binux is a software engineer and an open source developer. He focuses on information extraction and the Spider System at work and builds interesting things online for fun. He is open to new technologies and tries to make the process of getting knowledge from the Web easier and build something useful with the power of the Web. Most of his work is open source, and you can find him on GitHub at http://github.com/binux. Tsahi Levent-Levi is an independent analyst and consultant for WebRTC. He has 15 years of experience in telecommunications, VoIP, and the 3G industry as an engineer, manager, marketer, and CTO. He is an entrepreneur, independent analyst, and consultant and assists companies to form a bridge between technologies and business strategies in the domain of telecommunications. He has an MSc degree in computer science and an MBA degree, with specialization in entrepreneurship and strategy. He has been granted three patents related to 3G-324M and VoIP. He was the chairman of various activity groups within IMTC, an organization focusing on the interoperability of multimedia communications. He is also the author and editor of his blog https://bloggeek.me, which focuses on the ecosystem and business opportunities around WebRTC.
    Andrii Sergiienko is an entrepreneur who is passionate about information technology and travelling. He has lived in different places, such as Ukraine, Russia, Belarus, Mongolia, Buryatia, and Siberia—and has spent many years in every place. He also likes to travel by auto. From his early childhood, he was interested in computer programming and hardware. He took his first step in these fields more than 20 years ago. He has experience working with a wide set of languages and technologies, including C, C++, Java, Assembler, Erlang, JavaScript, PHP, Riak, shell scripting, computer networks, security, and so on. During his career, he has worked for both small local companies, such as domestic ISP, and large world corporations, such as Hewlett Packard. He has also started his own companies—some of them were relatively successful; others totally failed. Today, he is working on the growth aspect of Oslikas—his new company that has its headquarters in Estonia. The company is focused on modern IT technologies and solutions. They also develop a full-stack framework to create rich media WebRTC applications and services. For more information on Oslikas, you can visit http:// www.oslikas.com.
    www.PacktPub.com Support files, eBooks, discount offers, and more For support files and downloads related to your book, please visit www.PacktPub.com. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@packtpub.com for more details. At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks. TM https://www2.packtpub.com/books/subscription/packtlib Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can search, access, and read Packt's entire library of books. Why subscribe? • Fully searchable across every book published by Packt • Copy and paste, print, and bookmark content • On demand and accessible via a web browser Free access for Packt account holders If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view 9 entirely free books. Simply use your login credentials for immediate access.
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