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Boris Smus - Web Audio API: Advanced Sound for Games and Interactive Apps

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Boris Smus Web Audio API: Advanced Sound for Games and Interactive Apps
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Web Audio API: Advanced Sound for Games and Interactive Apps: summary, description and annotation

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Go beyond HTML5s Audio tag and boost the audio capabilities of your web application with the Web Audio API. Packed with lots of code examples, crisp descriptions, and useful illustrations, this concise guide shows you how to use this JavaScript API to make the sounds and music of your games and interactive applications come alive.You need little or no digital audio expertise to get started. Author Boris Smus introduces you to digital audio concepts, then shows you how the Web Audio API solves specific application audio problems. Youll not only learn how to synthesize and process digital audio, youll also explore audio analysis and visualization with this API.Learn Web Audio API, including audio graphs and the audio nodes Provide quick feedback to user actions by scheduling sounds with the APIs precise timing model Control gain, volume, and loudness, and dive into clipping and crossfading Understand pitch and frequency: use tools to manipulate soundforms directly with JavaScript Generate synthetic sound effects and learn how to spatialize sound in 3D space Use Web Audio API with the Audio tag, getUserMedia, and the Page Visibility API

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Web Audio API
Boris Smus
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To my parents: thank you for the music

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Preface

Thank you for picking up the first book on the topic of the Web Audio API. When I first learned of the Web Audio API, I was a complete digital-audio novice embarking on a journey to learn and understand the API, as well as the underlying fundamental audio concepts. This book is what I wish existed when I started experimenting with the API in 2011. It is intended to be a springboard for web developers like I was, with little to no digital-audio expertise. It contains the things I learned from about a year of studying digital audio processing, having conversations with audio experts, and experimenting with the API.

The theoretical bits will be filled in through asides, which will explain the concepts. If you are a digital-audio guru, feel free to skip these. The practical bits will be illustrated with code snippets to give you a better sense of how the API works in real life. Many of the examples also include links to working samples that can be found on this Web Audio API site.

Structure of This Book

This book aims to give a high-level overview of a number of important features of the Web Audio API, but is not an exhaustive survey of every available feature. It is not intended as a comprehensive guide, but as an easy starting point. Most sections of the book start off by describing an application, outlining the problem and solution, and then showing relevant sample JavaScript Web Audio API code. Interspersed theory sections explain some of the underlying audio concepts in more general terms. The book is structured in the following way:

  1. covers the basics of audio graphs, typical graph configurations, audio nodes inside those graphs, loading sound files, and playing sounds back.

  2. delves into precise scheduling of sound in the future, multiple simultaneous sounds, changing parameters directly or over time, and crossfading.

  3. covers gain, volume, and loudness, as well as preventing clipping via metering and dynamics compression.

  4. is all about sound frequency, an important property of periodic sound. Well also talk about oscillators and examining sound in the frequency domain.

  5. builds on the earlier chapters to dive into more advanced topics, including biquad filters, simulating acoustic environments, and spatialized sounds.

  6. In , we will take a break from synthesizing and manipulating sound, and analyze and visualize sound instead.

  7. talks about interfacing Web Audio API with other web APIs like WebRTC and the tag.

The source code of the book itself is released under the Creative Commons license and is available on GitHub.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Constant width

Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.

Constant width bold

Shows commands or other text that should be typed literally by the user.

Constant width italic

Shows text that should be replaced with user-supplied values or by values determined by context.

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Using Code Examples

This book is here to help you get your job done. In general, if this book includes code examples, you may use the code in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Web Audio API by Boris Smus (OReilly). Copyright 2013 Boris Smus, 978-1-449-33268-6.

If you feel your use of code examples falls outside fair use or the permission given above, feel free to contact us at .

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