iPhone Open Application Development

Audio Toolbox

The Audio Toolbox framework is new to Leopard, and is available on the desktop and iPhone platforms. As an extension to Core Audio, Audio Toolbox provides many low-level functions for processing sound on a bit stream level. Unlike Core Audio, many of Audio Toolbox's components can be used on the iPhone. The framework includes many APIs that provide access to the raw data within audio files and many conversion tools.

Unlike many of the frameworks covered in this book so far, the Audio Toolbox framework is predominantly C-oriented. Many references for Audio Toolbox are available on the Apple Developer Connection web site. These include:

Core Audio Overview: Audio Toolbox framework

http://developer.apple.com/documentation/MusicAudio/Conceptual/CoreAudioOverview/Introduction/chapter_1_section_1.html

Audio Toolbox Framework Reference

http://developer.apple.com/DOCUMENTATION/MusicAudio/Reference/CAAudioTooboxRef/index.html

Audio File Services Reference

http://developer.apple.com/documentation/MusicAudio/Reference/AudioFileConvertRef/Reference/reference.html

Audio File Stream Services Reference

http://developer.apple.com/documentation/MusicAudio/Reference/AudioStreamReference/AudioStreamReference.pdf

Audio Queue Services Reference

http://developer.apple.com/documentation/MusicAudio/Reference/AudioQueueReference/AudioQueueReference.pdf

Because it exists on the desktop platform, the Audio Toolbox framework is documented fairly well. We won't cover it in its entirety here, but only the ...