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Leopard Reference Library: Audio
System-level services in Mac OS X streamline the development process for audio developers, as well as for application developers who want to incorporate music and other audio media into their products. Core Audio is available to Cocoa applications. It provides native, multichannel audio in a manner scalable for future high-resolution formats. The Audio Unit API provides a plug-in architecture for both DSP and for MIDI-based virtual instruments. MIDI services allow for multiport MIDI capability.

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Audio Queue - Looping Compressed Audio (HTML)
QA1636: Discusses the format information required to seamlessly loop compressed audio using Audio Queue.
Technical Q&As 2009-02-20
NSSound Class Reference (HTML) (PDF)
Describes an object that loads and plays audio files.
Reference 2008-10-15
Audio File Services Reference (HTML) (PDF)
Describes a C programming interface for reading and writing audio files.
Reference 2008-07-08
Core Audio Glossary (HTML) (PDF)
Defines general digital audio terms as well as terms specific to Apple's Core Audio technology.
Reference 2008-07-07
Disc Recording Framework Reference (HTML)
Describes the Objective-C and C API for burning audio and data CDs and DVDs.
Reference 2008-04-08
Disc Recording UI Framework Reference (HTML)
Describes the Objective-C and C API for presenting a user interface when burning audio and data CDs and DVDs.
Reference 2008-04-08
Audio Queue Services Programming Guide (HTML) (PDF)
Describes how to play and record audio using Audio Queue Services.
Guides 2007-10-31
Audio Unit Programming Guide (HTML) (PDF)
Explains how to use Core Audio frameworks and the Core Audio SDK to create audio units.
Guides 2007-10-31
DiscRecording Release Notes (HTML)
Updated for Mac OS X v10.5
Release Notes 2007-10-31
Core Audio Overview (HTML) (PDF)
Provides an overview of Core Audio and its programming interfaces.
Guides 2007-01-08
Sound Programming Topics for Cocoa (HTML) (PDF)
Explains how to load and play audio data in Cocoa.
Guides 2006-11-07
TremoloUnit (HTML) (DMG) (ZIP)
Audio unit sample demonstrating how to build an effect unit with a generic view.
Sample Code 2006-10-26
Going Universal: Audio Developers Catch the Wave (HTML)
Learn how audio developers who built universal binaries of their applications are reaping the benefits.
Articles 2006-07-18
AudioDeviceNotify (HTML) (DMG) (ZIP)
Demonstrates how to enumerate audio devices attached to the system and how to handle device notifications
Sample Code 2006-04-21
ExtractMovieAudioToAIFF (HTML) (DMG) (ZIP)
Demonstrates how to extract audio from QuickTime Movies and write the data to an AIFF file.
Sample Code 2006-03-31
CoreAudio Overload Warnings (HTML)
QA1467: Describes CoreAudio overload warnings what they mean and how to avoid them.
Technical Q&As 2006-03-29
Using NSSound with CoreAudio on Mac OS 10.3.x (HTML)
QA1394: Workaround the NULL input buffers in a Core Audio IOProc callback when using NSSound by using AudioDeviceAddIOProc
Technical Q&As 2006-03-29
The Sound of Opportunity Knocking: The Audio Units Community Takes Off (HTML)
Learn how one developer created a successful business using audio units.
Articles 2005-10-31
Handling Audio Unit Events (HTML)
TN2104: This technote explains how to handle AudioUnit Events
Technical Notes 2005-04-29
Turn up the Volume with Audio Units (HTML)
Learn to build a sample volume unit, test it, and integrate it into GarageBand.
Articles 2005-01-31
Use NSSound instead of NSMovie for audio only playback on Mac OS X 10.3 and greater (HTML)
QA1335: Why using NSSound may be a better choice than using NSMovie for audio only playback.
Technical Q&As 2004-02-04