Getting Started with WebRTC电子书

Getting Started with WebRTC

Table of Contents

Getting Started with WebRTC

Credits

About the Author

About the Reviewers

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Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Errata

Piracy

Questions

1. An Introduction to Web-based Real-Time Communication

Introducing WebRTC

Uses for WebRTC

Try WebRTC yourself right now!

Browser compatibility

Chrome and Firefox on the PC

Chrome and Firefox on Android

Opera

Microsoft

Apple

Staying up-to-date

Summary

2. A More Technical Introduction to Web-based Real-Time Communication

Setting up communication

The general flow

Connect users

Start signals

Find candidates

Negotiate media sessions

Start RTCPeerConnection streams

Using WebSockets

Other signaling options

MediaStream API

RTCPeerConnection API

The caller's flow

Register the onicecandidate handler

Register the onaddstream handler

Register the message handler

Use getUserMedia to access the local camera

The JSEP offer/answer process

The callee's flow

Register the onicecandidate handler

Register the onaddstream handler

Register the message handler

Use getUserMedia to access the local camera

The JSEP offer/answer process

Where does RTCPeerConnection sit?

RTCDataChannel API

Summary

3. Creating a Real-time Video Call

Setting up a simple WebRTC video call

Using a web server to connect two users

Setting up a signaling server

Creating an offer in the caller's browser

Creating an answer in the callee's browser

Previewing the local video streams

Establishing peer-to-peer streams

Stream processing options

Extending this example into a Chatroulette app

Summary

4. Creating an Audio Only Call

Setting up a simple WebRTC audio only call

The HTML user interface for audio only calls

Adding an audio only flow to the signaling server

Audio stream processing options

Summary

5. Adding Text-based Chat

Adding text-based chat to our video chat app

The HTML user interface for text-based chat

Adding JavaScript functions to enable chatting

Handling text-based chat signals on the server

Other text message processing options

Summary

6. Adding File Sharing

Adding file sharing to our video chat app

The HTML user interface for file sharing

Adding JavaScript for enabling file sharing

Adding files using the <input> element

Adding support for drag-and-drop

Adding JavaScript for transferring files via WebSockets

Handling the file-sharing signals on the server

Sending a thumbnail preview before the entire file

Providing progress updates

Establishing an RTCDataChannel connection

Transfering files via an RTCDataChannel connection

Other file-sharing options

Summary

7. Example Application 1 – Education and E-learning

Applying WebRTC for education and e-learning

Overall application architecture

Educators

Students

WebRTC capable browser

Existing or new web application

Signaling server

TURN server

Archive server

Potential issues that may be faced

Privacy

Copyright and intellectual property

Restrictive networks

Restrictive SOEs

Outdated student browsers

Interoperability

Benefits that can be delivered

The opportunity for educators

Summary

8. Example Application 2 – Team Communication

Applying WebRTC for team communication

Overall application architecture

Managers

Team members

WebRTC capable browser

New and existing web applications

Signaling server

TURN server

Messaging server

Potential issues that may be faced

Privacy

Data security

Restrictive networks

Restrictive SOEs

Interoperability

Timezones

Benefits that can be delivered

The opportunity for managers

Summary

Index