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Audio can affect the human brain in the most powerful and profound ways. Using Apple’s Core Audio, you can leverage all that power in your own Mac and iOS software, implementing features ranging from audio capture to real-time effects, MP3 playback to virtual instruments, web radio to VoIP support. The most sophisticated audio programming system ever created, Core Audio is not simple. In Learning Core Audio , top Mac programming author Chris Adamson and legendary Core Audio expert Kevin Avila fully explain this challenging framework, enabling experienced Mac or iOS programmers to make the most of it. In plain language, Adamson and Avila explain what Core Audio can do, how it works, and how it builds on the natural phenomena of sound and the human language of audio. Next, using crystal-clear code examples, they guide you through recording, playback, format conversion, Audio Units, 3D audio MIDI connectivity, and overcoming unique challenges of Core Audio programming for iOS. Coverage includes: mastering Core Audio’s surprising style and conventions; recording and playback with Audio Queue; synthesizing audio; perform effects on audio streams; capturing from the mic; mixing multiple streams; managing file streams; converting formats; creating 3D positional audio; using Core MIDI on the Mac; leveraging your Cocoa and Objective-C expertise in Core Audio’s C-based environment, and much more. When you’ve mastered the “black arts” of Core Audio, you can do some serious magic. This book will transform you from an acolyte into a true Core Audio wizard.
- Sales Rank: #165526 in Books
- Brand: Lee, Mike/ Avila, Kevin
- Published on: 2012-04-09
- Released on: 2012-03-30
- Original language: English
- Number of items: 1
- Dimensions: 8.90" h x 1.00" w x 6.90" l, 1.10 pounds
- Binding: Paperback
- 336 pages
From the Back Cover
Create Rich, Powerful Audio Apps with Core Audio on OS X and iOS
�
Audio can affect the human brain in the most powerful and profound ways. Using Apple’s Core Audio, you can leverage all that power in your own Mac and iOS software, implementing features ranging from audio capture to real-time effects, MP3 playback to virtual instruments, and web radio to VoIP support. The most sophisticated audio programming system ever created, Core Audio is not simple. In Learning Core Audio , top iOS programming author Chris Adamson and legendary Core Audio expert Kevin Avila fully explain this challenging framework, enabling experienced Mac or iOS programmers to make the most of it.
�
In plain language, Adamson and Avila explain what Core Audio can do, how it works, and how it builds on the natural phenomena of sound and the human language of audio. Next, using crystal-clear code examples, they guide you through recording, playback, format conversion, Audio Units, 3D audio MIDI connectivity, and overcoming the unique challenges of Core Audio programming for Mac and iOS.
�
Coverage includes
• Mastering Core Audio’s surprising style and conventions
• Implementing recording and playback with the Audio Queue architecture
• Using Audio Units to synthesize audio, perform effects on audio streams, capture from the mic, and mix multiple streams
• Managing file streams and converting formats with Core Audio’s helper APIs
• Creating positional audio in 3D space with OpenAL
• Using Core MIDI to synthesize audio on-the-fly
• Leveraging your Cocoa and Objective-C expertise in Core Audio’s C-based environment
�
When you’ve mastered the “black arts” of Core Audio, you can do some serious magic. This book will transform you from an acolyte into a true Core Audio wizard.
About the Author
Chris Adamson is an independent writer, editor, and developer who lives in Grand Rapids, Michigan. Now focusing on iOS and Mac development, he is the coauthor of iOS SDK Development. He is also the author of QuickTime for Java: A Developer's Notebook and coauthor of Swing Hacks. He was formerly the editor of java.net and ONJava.com. He consults and publishes through his corporate identity, Subsequently and Furthermore, Inc., with a focus on user-facing and digital media development for Mac and iOS. He blogs on digital media software development at www.subfurther.com/blog. In a previous career, he was a writer/associate producer at CNN Headline News, and over the years, he has managed to own 11 1/2 Macs.
Kevin Avila (a.k.a. dogbert) is a smooth blend of carbon compounds, oxygen, hydrogen, and nitrogen, with some impurities for added flavor. Additionally, he has more than 15 years' experience developing for the Mac and, since its release, the iPhone. Kevin has been involved in every corner of the audio market, from being an engineer at Apple to configuring professional recording studios. He currently is a code mercenary for various clients while he sits in his underwear at home, sipping coffee.
Most helpful customer reviews
11 of 11 people found the following review helpful.
Deprecated!
By D. Marnatti
iOS and OS X audio are done differently and the bulk of the examples work on OS X only. HAL methods (the methods with "Hardware" in their names) have been deprecated. I learned a lot from this book. Note to Chris Adamson, time for a new updated edition - this could be the definitive text.
6 of 6 people found the following review helpful.
Clearing away the fear, uncertainty, and doubt.
By Todd Stewart
I've been working with AudioQueue microphone input (IOS) for over a year, but found myself avoiding anything deeper (properties, listener callback notifications, metering, audio units, ...). After running through this tutorial, I now understand what is going on under the hood, and have moved down into working directly with audio units.
For me the most useful tips were:
1) Simple CheckError() logic to decrypt the 4 character mode and error code constants used throughout.
2) Clear explanation of file formats, audio formats, converters, and native PCM representations on IOS and OSX.
3) Pointers for where to find CoreAudio documentation (much of it can be found only in header file comments)
4) Clear pattern for required lifecycle sequence of constructing an audio units graph of nodes, which must be defined before open, opened before starting to set properties, and properties setup before initialize.
5) Reusable patterns for the sometimes awkward pointer arithmetic required to assemble AudioBufferLists on the fly.
6) Unkinking the awkward syntax of Output units, which are used for both hardware output and hardware input. Both the outbound bus #0 and inbound bus #1 have input and output scopes, which relate to where the unit fits into the graph. Clear description of threading, buffering, and clocking issues which must be handled in OSX context which may include multiple external audio accessories from different vendors, with different clocking and timing. After completing this tutorial I now "get it".
7) Clear description of the differences between OSX and IOS implementations.
8) The quick intro to OpenAL and Midi were interesting, and enough for me to understand how these work, though they aren't part of what I do.
Overall this book was a great help to me. I highly recommend it to anyone already experienced with OSX or IOS development, but wanting to dig deeper into audio. Not much audio background is required (the first chapters cover the basics), though you will need to be comfortable with working almost entirely in C with nary an NS* in sight. Even the file I/O operations use CoreFoundation (not Foundation) methods. If you are looking for a higher level interface, you may want to explore the AVFoundation or MediaPLayer frameworks, which are nicely documented in Xcode docs, but are not covered by this lower level tutorial.
10 of 12 people found the following review helpful.
At last a book on Core Audio, and a good one!
By Michele
First let's start with stating how satisfied I am of having found that this book exists. Core audio is one of the most difficult programming topic I ever found, because of the subject matter and because of arcane, not very well documented, obscure and often inconsistent Api conventions and naming. OpenGl is difficult as it requires loads of mathematics, but is wery well documented. Core Audio is as difficult as OpenGL, mayebe more, but knowledge about it is much harder to be found.
The authors take their time to tell their readers what this book is not, it is not a book for wannabe programmers, it is not a beginners guide, beginners and less than determined programmers, please look elswhere. Audio is not for everybody, it involves doing computations in real time and is an order of magnitude more difficult than say, Ruby web based design.
A prerequisite for a beginner's book on Audio on Mac OsX and iOS, is being a rather advanced programmer in all three major languages required by the platform: Objective C, C (on which Core audio is based) and C++ (because of OpenAl 3d audio). You should be proficient enough to be familiar with structs, pointers and memory allocation.
The approach of the authors is keeping the UI side to a bare minimum, as UI is not what this book is all about: on the Mac side this choice implies having to deal with command line programs, and ignoring the Cocoa side of things. As this book is centered on Audio programming this choice is very logical. On the iOS chapter, a barebone simple View controller is used (as iOS does not support CLI.).
Learning Core Audio explains how to use all the major audio engines available on Apple platforms, which are basic Core Audio services, Core audio queues, Audio units and Open Al.
Differences between the iOS and Mac approach is detailed in the 10th chapter, after the Mac platform has been explained.
What you won't find in this book: this is not a complete treatment of the matter, which would have been simply impossible, but is rather gentle (as gentle as possible, not too much) introduction to as much as possible of the main aspects of the matter. The authors do attempt to let the reader acquire a full view on the general phylosophy, unwritten conventions and way of thinking necessary in order to deal with the frameworks, enabling the reader to go on and research further on his or her own after reading this book. The authors do manage to render Core audio understandable and practically approachable by determined and cabable programmers, and out of the restricted circle of �ber-Hackers and programming demi-gods. At least a book on Core Audio for us normal humans, the authors seem to discourage casual potential readers by stating how difficult Core Audio is, well I do believe the subject is difficult, but they did an excellent job in making it practically understandable.
How to build a complete commercial Audio Unit is not dealt with, nor is in any way treated the required knowledge of electronic music principles and digital signal processing. These subjects require separate reading of the typical well known and usually large tomes on the subject (e.g. Boulanger, Openheim-Shafer).
I cannot but recommend this book as required reading on the matter of Core Audio programming.
Personally I would have liked to see at least an introductory chapter on DSP and some coverage of Audio Unit development, but these subjects were obviously either too complex or not completely related to Core Audio learning, for which this book is THE starting point.
I am also very grateful to the publisher, for the courage shown in publishing a book which will not be of interest for a very large audience, but which was nonetheless desperately needed.
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