2. Getting the User's Media | Learning WebRTC

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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

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Getting access to media devices

There has been a long history behind trying to get media devices to the browser screen. Many have struggled with various Flash-based or other plugin-based solutions that required you to download and install something in your browser to be able to capture the user's camera. This is why the W3C decided to finally create a group to bring this functionality into the browser. The latest browsers now give the JavaScript access to the getUserMedia API, also known as the MediaStream API.

This API has a few key points of functionality:

It provides a stream object that represents a real-time media stream, either in the form of audio or video
It handles the selection of input devices when there are multiple cameras or microphones connected to the computer
It provides security through user preferences and permissions that ask the user before a web page can start fetching a stream from a computer's device

Before we move any further, we should set a few standards about our coding...

Visually different images

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