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Learning Core Audio: A Hands-On Guide to Audio Programming for Mac and iOS (Anglais) Broché – 30 mars 2012

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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.

Quatrième de couverture

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.


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Format: Broché
Thanks to this book I was able to write my small app (MuteMyMic). As my application is based on low level APIs for sound input/output in OS X, I had to find some sort of comprehensive guid related to the topic. And this is the book I have found the best on the market, so far. Of course you can find a loot of material, that is covered here covered here, somewhere in the web. But when it comes to a single source of the information related to the topic, this one is the best one. Highly recommended.
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Format: Broché
J'ai mis beaucoup de temps à parcourir ce livre.

Il y a un nombre d'informations impressionnantes et des usages que je n'avais pas soupçonné possible avec CoreAudio. Si vous avez du temps et déjà un solide niveau en iOS je vous conseille cet ouvrage. sinon passez votre chemin ^^
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Commentaires client les plus utiles sur Amazon.com (beta)

Amazon.com: 4.6 étoiles sur 5 25 commentaires
11 internautes sur 11 ont trouvé ce commentaire utile 
3.0 étoiles sur 5 Deprecated! 18 novembre 2013
Par D. Marnatti - Publié sur Amazon.com
Format: Broché Achat vérifié
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.
7 internautes sur 7 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 Clearing away the fear, uncertainty, and doubt. 22 mai 2012
Par Todd Stewart - Publié sur Amazon.com
Format: Broché Achat vérifié
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.
4 internautes sur 4 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 This is the only actual documentation for Core Audio 26 août 2012
Par Josh Myer - Publié sur Amazon.com
Format: Broché Achat vérifié
A weekend with this book was better than two weeks of evenings fighting with the "documentation" that exists elsewhere. After working through the examples in this, you'll be able to fight your way through the CA reference documents to do new things. I highly recommend it, with no reservations.

That said, I have two criticisms of the text: their presentation of code snippets and the shallowness of their applications. The code itself is solid, with good references and such, but it's split up into a couple dozen of snippets for each chapter, which is kind of difficult to work with. It may be that it's impossible to present things in a better way, though. As far as the shallowness goes: as you build off their basic apps, you'll notice that things get a lot more complicated, rather quickly. I'm definitely glad they didn't throw us into the deep end of this right off the bat, but, at the same time, it's nuanced to integrate CA code alongside UI code. A simple drum machine or synth keyboard app would be really helpful, after showing us the trivial CLI apps.

On the whole, this is a fantastic and indispensable book, with a couple of things to improve to make it perfect. If you're looking at working with Core Audio, glance at Apple's documentation, then buy a copy. It will save you a lot of time and frustration.
2 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 Excellent read and roadmap 29 avril 2013
Par James Goodin - Publié sur Amazon.com
Format: Broché Achat vérifié
This is long overdue as i got this book at the end of 2012. I read and worked through each example codeset once with both fascination and struggle. The struggle was a mix of both, what the authors', Chris Adamson and Kevin Avila, pointed out early in the read, that being this stuff, Core Audio, is not easy, and with programming I'm self-taught which has both blessings and curses in learning behaviors.

The book is written with reality 'how-to' and art, and I would add a sense of humor which keeps it from being a dry interpretation of Apple engineering. Though the latter is brilliant Apple's documentation is dense and cumbersome which in 'Learning Core Audio...' authors' Adamson and Avila took that brilliance and laid it out in somewhat baby steps and breadcrumbs which make the subject accessible and practical.

As pointed out early on, 'Learning Core...' is not a beginning programming book but an advanced topic that assumes both exposure with the C language, Mac OS, Xcode and Objective C. This said it had been several years since I had thought in the C language or any language for that matter till I began the journey with Objective C about two years ago. What I found however was that as I worked through the example code which I would say don't just download it, physically type it in and absorb it. After you see what the codeset will do manipulate it and see what else it will do. This approach has pushed me and given renewed programming confidence and I personally thank this book for doing that.

I will add to that, in my case some of the chapters and projects took me multiple reads to 'get it' partly as it's how I learn. In fact I'm still revisiting a great deal of the book for clarity and referral as I work through my own ideas and projects.

The only criticism I would make on this excellent work and this was through my experience which may have been my setup and version of Xcode as initially i was using 4.2 on Snow Leopard. I found on a few projects to get them to work I had to include framworks not mentioned in the example code. This may have been my oversight or misinterpretation but there were a couple of projects which appeared to only need the AudioToolbox framework and I found through trial error that I had to add ApplicationServices a time or two. I will say prior to this book all of my work with Objective C and iOS had been coding for graphical apps. The majority of projects in this book make command line Terminal or Xcode Console executables and not iOS apps. This said, the plus in that is you will learn to code for the OS X operating system as well as being able to move the code with some modifications in to the iOS world.

Bottomline Chris and Kevin's 'Learning Core Core Audio...' is excellent, inspiring and confidence building for those interested in delving in to this 'black box' of chip and voodoo mystery.
2 internautes sur 2 ont trouvé ce commentaire utile 
5.0 étoiles sur 5 I wouldn't know what i would do without this. 14 avril 2013
Par Ken Zheng - Publié sur Amazon.com
Format: Broché Achat vérifié
I'm an iOS developer fir a VoIP company and needed to build an audio engine for Mac OS platform. Apple's documentation and online forums helped a little but the information was scattered so much that it was hard to wrap your head around CoreAudio API. I found this book, locked myself in my room for a month, and built the audio engine from the ground up. I wouldn't know what I would have done without it. Also, I know nothing about sound and audio but this book filled in the blanks just enough for me to understand how it works. I thank the authors so much for their hard work and dedication in bringing all of this information into one book. Seriously, these guys found essential information that was only found in a comment in one of Apple's sample projects. Great resource!
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