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Leopard Reference: Cocoa
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 (audio in/audio out) and virtual instruments (MIDI in/audio out). MIDI services allow for multiport MIDI capability.
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Audio Codec Services Reference (HTML) (PDF)
Describes the programming interface for configuring audio codecs and for encoding and decoding audio data.
 2007-10-31
Audio File Services Reference (HTML) (PDF)
Describes a C programming interface for reading and writing audio files.
 2008-07-08
Disc Recording Framework Reference (HTML)
Describes the Objective-C and C API for burning audio and data CDs and DVDs.
 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.
 2008-04-08
NSSound Class Reference (HTML) (PDF)
Describes an object that loads and plays audio files.
 2008-10-15