6. Sending Data with WebRTC | Learning WebRTC

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Table Of Contents

Learning WebRTC

By : Daniel M. Ristic

4 (5)

Learning WebRTC

4 (5)

By: Daniel M. Ristic

Overview of this book

If you are a web developer who wants to create well designed WebRTC applications for your users, this is the book for you. Even if you are early in your web development career, this book aims to provide a complete understanding of the WebRTC API. It is assumed that you have previous exposure to web development using HTML5 and JavaScript technologies.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with WebRTC

1. Getting Started with WebRTC

Audio and video communication today

Enabling audio and video on the Web

Creating web standards

Using WebRTC in your browser

Applications enabled by WebRTC

Self-test questions

Summary

2. Getting the User's Media

2. Getting the User's Media

Getting access to media devices

Constraining the media stream

Handling multiple devices

Modifying the media stream

Self-test questions

Summary

3. Creating a Basic WebRTC Application

3. Creating a Basic WebRTC Application

Understanding UDP transport and real-time transfer

The WebRTC API

Building a basic WebRTC application

Running your first WebRTC application

Self-test questions

Summary

4. Creating a Signaling Server

4. Creating a Signaling Server

Building a signaling server

Setting up our environment

Getting a connection

Identifying users

Initiating a call

Answering a call

Handling ICE candidates

Hanging up a call

Complete signaling server

Signaling in the real world

Self-test questions

Summary

5. Connecting Clients Together

5. Connecting Clients Together

The client application

Setting up the page

Getting a connection

Logging in to the application

Initiating a call

Hanging up a call

A complete WebRTC client

Improving the application

Self-test questions

Summary

6. Sending Data with WebRTC

6. Sending Data with WebRTC

Stream Control Transmission Protocol and data transportation

The RTCDataChannel object

Encryption and security

Adding text-based chat

Use cases

Self-test questions

Summary

7. File Sharing

7. File Sharing

Getting a file with the File API

Breaking down a file into chunks

Putting it together on the other side

Showing progress to the user

Self-test questions

Summary

8. Advanced Security and Large-scale Optimization

8. Advanced Security and Large-scale Optimization

Securing the signaling server

Supporting mobile devices

Introduction to mesh networking

Video conferencing with more users

The future of conference calls

Self-test questions

Summary

A. Answers to Self-test Questions

A. 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

Index

The RTCDataChannel object

Now that we understand the underlying technologies at play, we can start learning how the actual RTCDataChannel object API works. The great thing is that this API is much less complex than the underlying workings of the SCTP. The main function to create a channel comes from an already established RTCPeerConnection object:

var peerConnection = new RTCPeerConnection();

// Establish your peer connection using signaling here

var dataChannel = peerConnection.createDataChannel("myLabel", dataChannelOptions);

This is all you need to get started! The WebRTC API will take care of everything else on the browser's internal layer. This will all happen once signaling has been performed and the connection has been established. You can create a data channel at any point in the process until the RTCPeerConnection object is closed. Though it is closed, it will throw an error when trying to create a new channel.

There are a number of states that a data channel can be in:

connecting...

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