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  • Book Overview & Buying WebRTC Cookbook
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WebRTC Cookbook

WebRTC Cookbook

By : Andrii Sergiienko
5 (1)
Buy this Book
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WebRTC Cookbook

WebRTC Cookbook

5 (1)
By: Andrii Sergiienko
Buy this Book

Overview of this book

If you are a JavaScript developer with a basic knowledge of WebRTC and software development, but want to explore how to use it in more depth, this book is for you.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Peer Connections
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1. Peer Connections
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Introduction
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Building a signaling server in Erlang
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Building a signaling server in Java
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Detecting WebRTC functions supported by a browser
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Making and answering calls
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Implementing a chat using data channels
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Implementing a chat using a signaling server
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Configuring and using STUN
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Configuring and using TURN
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2. Supporting Security
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2. Supporting Security
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Introduction
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Generating a self-signed certificate
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Configuring a TURN server with authentication
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Configuring a web server to work over HTTPS
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Configuring a WebSockets proxy on the web server
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Configuring a firewall
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3. Integrating WebRTC
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3. Integrating WebRTC
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Introduction
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Integrating WebRTC with Asterisk
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Integrating WebRTC with FreeSWITCH
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Making calls from a web page
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Integration of WebRTC with web cameras
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4. Debugging a WebRTC Application
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4. Debugging a WebRTC Application
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Introduction
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Working with a WebRTC statistics API
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Debugging with Chrome
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Debugging TURN
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Debugging using Wireshark
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5. Working with Filters
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5. Working with Filters
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Introduction
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Working with colors and grayscale
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Working with brightness
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Working with contrast
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Working with saturation
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Working with hue
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Using the sepia filter
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Using the opacity filter
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Inverting colors
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Implementing the blur effect
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Implementing the dropped shadow effect
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Combining filters
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Custom video processing
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6. Native Applications
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6. Native Applications
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Introduction
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Building a customized WebRTC demo for iOS
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Compiling and running an original demo for iOS
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Compiling and running a demo for Android
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Building an OpenWebRTC library
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7. Third-party Libraries
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7. Third-party Libraries
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Introduction
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Building a video conference using SimpleWebRTC
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Creating an application using RTCMultiConnection
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Developing a simple WebRTC chat using PeerJS
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Making a simple video chat with rtc.io
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Using OpenTok to create a WebRTC application
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Creating a multiuser conference using WebRTCO
8
8. Advanced Functions
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8. Advanced Functions
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Introduction
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Visualizing a microphone's sound level
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Muting a microphone
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Pausing a video
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Taking a screenshot
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Streaming media
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Index
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Index

Taking a screenshot

Sometimes, it can be useful to be able to take screenshots from a video during videoconferencing. In this recipe, we will implement such a feature.

Getting ready

No specific preparation is necessary for this recipe. You can take any basic WebRTC videoconferencing application. We will add some code to the HTML and JavaScript parts of the application.

How to do it…

Follow these steps:

  1. First of all, add image and canvas objects to the web page of the application. We will use these objects to take screenshots and display them on the page:

    <img id="localScreenshot" src="">
<canvas style="display:none;" id="localCanvas"></canvas>

  2. Next, you have to add a button to the web page. After clicking on this button, the appropriate function will be called to take the screenshot from the local stream video:

    <button onclick="btn_screenshot()" id="btn_screenshot">Make a screenshot</button>

  3. Finally, we need to implement the screenshot taking function:

    function btn_screenshot...
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WebRTC Cookbook
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