WebRTC Cookbook

Table of Contents

WebRTC Cookbook

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

Downloading the color images of this book

Errata

Piracy

Questions

1. Peer Connections

Introduction

Building a signaling server in Erlang

Getting ready

How to do it…

How it works…

There's more…

See also

Building a signaling server in Java

Getting ready

How to do it…

How it works…

There's more…

See also

Detecting WebRTC functions supported by a browser

Getting ready

How to do it…

How it works…

There's more…

See also

Making and answering calls

Getting ready

How to do it…

Making a call

Answering a call

How it works…

There's more…

See also

Implementing a chat using data channels

Getting ready

How to do it…

Creating the main HTML page of the application

Creating the JavaScript helper library

How it works…

There's more…

See also

Implementing a chat using a signaling server

How to do it…

How it works…

There's more…

See also

Configuring and using STUN

Getting ready

How to do it…

How it works…

There's more…

See also

Configuring and using TURN

Getting ready

How to do it…

Installing the TURN server

Using TURN in WebRTC application

How it works…

There's more…

See also

2. Supporting Security

Introduction

Generating a self-signed certificate

Getting ready

How to do it…

How it works…

There's more…

See also

Configuring a TURN server with authentication

Getting ready

How to do it…

Implementing the client-side code

Implementing the server-side code

How it works…

There's more…

See also

Configuring a web server to work over HTTPS

Getting ready

How to do it…

Configuring Nginx

Configuring Apache

Configuring IIS

There's more…

See also

Configuring a WebSockets proxy on the web server

Getting ready

How to do it…

Configuring Nginx

Configuring Apache

Configuring IIS

How it works…

There's more…

See also

Configuring a firewall

Getting ready

How to do it…

Configuring a firewall on a server

Configuring a firewall on a client

See also

3. Integrating WebRTC

Introduction

Integrating WebRTC with Asterisk

Getting ready

How to do it…

Installing libSRTP

Installing Asterisk

How it works…

There's more…

See also

Integrating WebRTC with FreeSWITCH

Getting ready

How to do it…

Installing FreeSWITCH

Enabling WebRTC

Starting FreeSWITCH

How it works…

There's more…

See also

Making calls from a web page

Getting ready

How to do it…

Installing sipML5

How it works…

There's more…

See also

Integration of WebRTC with web cameras

Getting ready

How to do it…

Configuring the webcam

Installing WebRTC media server

Time for magic

How it works…

There's more…

4. Debugging a WebRTC Application

Introduction

Working with a WebRTC statistics API

Getting ready

How to do it…

Checking estimated bandwidth

Checking packet loss

How it works…

There's more…

See also

Debugging with Chrome

Getting ready

How to do it…

Using webrtc-internals

Using Chrome logging mechanism

How it works…

There's more…

See also

Debugging TURN

Getting ready

How to do it…

How it works…

There's more…

See also

Debugging using Wireshark

Getting ready

How to do it…

How it works…

There's more…

See also

5. Working with Filters

Introduction

Working with colors and grayscale

How to do it…

How it works…

Working with brightness

How to do it…

How it works…

Working with contrast

How to do it…

How it works…

Working with saturation

How to do it…

How it works…

Working with hue

How to do it…

How it works…

Using the sepia filter

How to do it…

How it works…

Using the opacity filter

How to do it…

How it works…

Inverting colors

How to do it…

How it works…

Implementing the blur effect

How to do it…

How it works…

Implementing the dropped shadow effect

How to do it…

How it works…

Combining filters

How to do it…

How it works…

Custom video processing

How to do it…

How it works…

6. Native Applications

Introduction

Building a customized WebRTC demo for iOS

Getting ready

How to do it…

There's more…

Building a demo project for a iOS simulator

See also

Compiling and running an original demo for iOS

Getting ready

How to do it…

Building a demo project for an iOS device

Building a demo project for an iOS simulator

There's more…

See also

Compiling and running a demo for Android

Getting ready

Preparing the system

Installing Oracle JDK

Getting the WebRTC source code

Installing Android Developer Tools

How to do it…

Running on the Android simulator

Fixing a bug with GLSurfaceView

Running on a physical Android device

There's more…

See also

Building an OpenWebRTC library

Getting ready

How to do it…

There's more…

7. Third-party Libraries

Introduction

Building a video conference using SimpleWebRTC

Getting ready

How to do it…

How it works…

There's more…

Creating an application using RTCMultiConnection

Getting ready

How to do it…

How it works…

There's more…

Developing a simple WebRTC chat using PeerJS

Getting ready

How to do it…

How it works…

There's more…

Making a simple video chat with rtc.io

Getting ready

How to do it…

How it works…

There's more…

Using OpenTok to create a WebRTC application

Getting ready

How to do it…

How it works…

There's more…

Creating a multiuser conference using WebRTCO

Getting ready

How to do it…

How it works…

There's more…

8. Advanced Functions

Introduction

Visualizing a microphone's sound level

Getting ready

How to do it…

How it works…

See also

Muting a microphone

Getting ready

How to do it…

How it works…

There's more…

See also

Pausing a video

Getting ready

How to do it…

How it works…

See also

Taking a screenshot

Getting ready

How to do it…

How it works…

See also

Streaming media

Getting ready

How to do it…

How it works…

See also

Index

WebRTC Cookbook

WebRTC Cookbook

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: February 2015

Production reference: 1200215

Published by Packt Publishing Ltd.

Livery Place

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Birmingham B3 2PB, UK.

ISBN 978-1-78328-445-0

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Credits

Author

Andrii Sergiienko

Reviewers

Pasquale Boemio

Jose López

Marcos de Vera Piquero

Commissioning Editor

Usha Iyer

Acquisition Editor

Sam Wood

Content Development Editor

Rahul Nair

Technical Editor

Siddhi Rane

Copy Editor

Neha Vyas

Project Coordinator

Judie Jose

Proofreaders

Ting Baker

Simran Bhogal

Maria Gould

Paul Hindle

Indexer

Hemangini Bari

Production Coordinator

Melwyn Dsa

Cover Work

Melwyn Dsa

About the Author

Andrii Sergiienko is a computer software developer from Ukraine and is passionate about information technologies. From his early childhood, he was interested in computer programming and hardware. He took his first step into these fields more than 20 years ago. He has experience of a wide set of languages and technologies including C, C++, Java, assembly language, Erlang, JavaScript, PHP, Riak, shell scripting, computer networks, and security.

During his career he worked for both small, local companies such as domestic ISP and large, worldwide corporations such as Hewlett Packard. He also started his own projects—some of them were relatively successful.

Today, he is the owner and inspirer of OSLIKAS OÜ, a computer software company with headquarters in Estonia. The company (http://www.oslikas.com) focuses on modern IT technologies and solutions.

Working on this book was a really great and interesting experience for me. All this would be impossible without the help of certain people. And now is the time for me to say thank you to them.

First of all, I would like to thank my parents Olga and Alexander for my happy childhood that established the foundation for my life and career.

I would like to say thank you to my wife Inna for her patience, encouragement, and support during this process.

I would like to thank the Packt Publishing team as well. These guys are doing really great work and making the world a better place. We contacted some of them directly during the work, and others stayed behind the scenes. However, I know that a lot of people spent part of their lives to make this book possible. Thank you all.

About the Reviewers

Pasquale Boemio fell in love with Linux and the open source philosophy at the age of 12. Following this passion, he studied computer engineering at University of Naples Federico II from where he graduated with a master's degree.

Currently, he is working as a researcher in the Department of Electrical Engineering and Information Technology (DIETI) in the University of Naples Federico II, contributing to the development of real-time communication technologies. His efforts in this field are concretized by supporting the Meetecho project (www.meetecho.com).

Meetecho is a university spin-off and a tool for the collaborative work currently used by the Internet Engineering Task Force (IETF) to provide remote participation to the working groups. Meetecho leverages some state-of-the-art technologies (such as WebRTC and Docker) to implement a comprehensive architecture that can be lightweight and portable. Meetecho's best project is the Janus WebRTC Gateway (http://janus.conf.meetecho.com/), mentioned later in this book, which allows a user the ability to integrate different, real-time technologies without any pains.

In his spare time, Pasquale works on some personal open source projects (https://github.com/helloIAmPau) and helps the community by giving his contributions to cool projects found on the GitHub platform.

He has already worked with Packt Publishing by reviewing WebRTC Integrator's Guide, a useful guide for anyone who needs to integrate WebRTC with a retro technology such as SIP.

Jose López was born in Galicia, Spain. He is a telecommunications engineer with a large amount of experience in software development, and is also focused on real-time audio/video communications. He started working for Quobis Networks in 2013, a leading company in WebRTC solutions.

Marcos de Vera Piquero is a software engineer who has mainly worked with Python and CoffeeScript. His area of development is now focused on the server side of real-time multimedia applications at Quobis, his current employer. He's also a free software enthusiast and is trying to make it a real alternative.

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Preface

WebRTC is a relatively new and revolutionary technology that opens new horizons in the area of interactive applications and services. Most of the popular web browsers support it natively (such as Chrome and Firefox) or via extensions (such as Safari). Mobile platforms such as Android and iOS allow you to develop native WebRTC applications.

This book covers a wide set of topics on how to develop software using a WebRTC stack. Using practical recipes, it considers basic concepts, security, debugging, integration with other technologies, and other important themes of the development process in a friendly manner.

You will not only learn about WebRTC-specific features, but also attendant technologies (CSS3, HTML5, and WebSockets), and how to use them along with WebRTC.

What this book covers

Chapter 1, Peer Connections, introduces you to the very basic concepts of WebRTC. This includes practical recipes on peer connections. You will also find simple demo applications in this chapter.

Chapter 2, Supporting Security, leads you through various security-related topics and covers how to secure a typical WebRTC application's infrastructure components: SSL/TLS certificates, WebSockets, web servers, STUN/TURN, data channels, and more.

Chapter 3, Integrating WebRTC, considers integrating a WebRTC application with other technologies and third-party software. This chapter describes practical cases and solutions on integration.

Chapter 4, Debugging a WebRTC Application, is dedicated to application debugging—an important topic of the software development process. In this chapter, you will learn about the topics relating to debugging in the scope of WebRTC.

Chapter 5, Working with Filters, teaches you how to use CSS3 filters with WebRTC applications. This chapter also covers custom image processing.

Chapter 6, Native Applications, contains practical, step-by-step recipes dedicated to developing native WebRTC applications on mobile platforms.

Chapter 7, Third-party Libraries, describes general use cases and practical solutions based on third-party WebRTC frameworks and services.

Chapter 8, Advanced Functions, covers how to use advanced WebRTC features. It contains practical recipes on file transferring, streaming, audio/video controlling, and more.

What you need for this book

To use the recipes and codes provided and considered in this book, you will need a few pieces of software installed:

Java SE 7: Note that for Android-related recipes from Chapter 6, Native Applications, you need Java SE 6 as well—the installation and configuration process