AudioToolbox.framework

The Audio Toolbox framework contains the APIs that provide application-level services. The Audio Toolbox framework includes these header files:

• AudioConverter.h: Audio Converter API. Defines the interface used to create and use audio converters.

• AudioFile.h: Defines an interface for reading and writing audio data in files.

• AudioFileStream.h: Defines an interface for parsing audio file streams.

• AudioFormat.h: Defines the interface used to assign and read audio format metadata in audio files.

• AudioQueue.h: Defines an interface for playing and recording audio.

• AudioServices.h: Defines three interfaces. System Sound Services lets you play short sounds and alerts. Audio Hardware Services provides a lightweight interface for interacting with audio hardware. Audio Session Services lets iPhone and iPod touch applications manage audio sessions.

• AudioToolbox.h: Top-level include file for the Audio Toolbox framework.

• AUGraph.h: Defines the interface used to create and use audio processing graphs.

• ExtendedAudioFile.h: Defines the interface used to translate audio data from files directly into linear PCM, and vice versa.

In OS X you have these additional header files:

• AudioFileComponents.h: Defines the interface for Audio File Component Manager components. You use an audio file component to implement reading and writing a custom file format.

• AudioUnitUtilities.h: Utility functions for interacting with audio units. Includes audio unit parameter conversion functions, and audio unit event functions to create listener objects, which invoke a callback when specified audio unit parameters have changed.

• CAFFile.h: Defines the Core Audio Format audio file format. See Apple Core Audio Format Specification 1.0 for more information.

• CoreAudioClock.h: Lets you designate a timing source for synchronizing applications or devices.

• MusicPlayer.h: Defines the interface used to manage and play event tracks in music sequences.

• AUMIDIController.h: Deprecated: Do not use. An interface to allow audio units to receive data from a designated MIDI source. Standard MIDI messages are translated into audio unit parameter values. This interface is superseded by functions in the Music Player API.

• DefaultAudioOutput.h: Deprecated: Do not use. Defines an older interface for accessing the default output unit (deprecated in OS X v10.3 and later).

AudioUnit.framework

The Audio Unit framework contains the APIs used for managing plug-ins in Core Audio. Except as noted, the Audio Unit framework includes these header files:

• AUComponent.h: Defines the audio unit types.

• AudioComponent.h: (iOS only) Defines the interface for using audio components.

• AudioOutputUnit.h: Defines the interface used to turn an output unit on or off.

• AudioUnit.h: Include file for the Audio Unit framework.

• AudioUnitParameters.h: Predefined parameter constants used by Apple's audio units. Third parties can also use these constants for their own audio units.

• AudioUnitProperties.h: Predefined audio unit properties for common audio unit types as well as Apple's audio units.

In OS X you have these additional header files:

• AUCocoaUIView.h: Defines the protocol for a custom Cocoa view you can use to hold your audio unit's user interface. See also CoreAudioKit.framework/AUGenericView.h.

• AudioCodec.h: Defines the interface used specifically for creating audio codec components..

• AudioUnitCarbonView.h: Defines the interface for loading and interacting with a Carbon-based audio unit user interface. A Carbon interface is packaged as a Component Manager component and appears as an HIView.

• AUNTComponent.h: Deprecated: Do not use. Defines the interface for older "v1" audio units. Deprecated in OS X v10.3 and later. Replaced by AUComponent.h.

• LogicAUProperties.h: An interface for audio units that run in the Logic Node environment of the Logic Studio application.

• MusicDevice.h: An interface for creating instrument units (that is, software-based music synthesizers).

CoreAudio.framework

The Core Audio framework contains data types common to all Core Audio services, as well as lower-level APIs used to interact with hardware. In OS X, this framework contains the interfaces for Hardware Abstraction Layer (HAL) Services.

This framework includes this header file:

• CoreAudioTypes.h: Defines data types used by all of Core Audio.

In OS X you have these additional header files:

• AudioDriverPlugin.h: Defines the interface used to communicate with an audio driver plug-in.

• AudioHardware.h: Defines the interface for interacting with audio device objects. An audio device object represents an external device in the hardware abstraction layer (HAL).

• AudioHardwarePlugin.h: Defines the CFPlugin interface required for a HAL plug-in. An instance of a plug-in appears as an audio device object in the HAL.

• CoreAudio.h: Top-level include file for the Core Audio framework.

• HostTime.h: Contains functions to obtain and convert the host's time base.

OpenAL.framework

The OpenAL framework provides an implementation of the the OpenAL specification. This framework includes these two header files:

• al.h

• alc.h

In iOS you have these additional header files:

• oalMacOSX_OALExtensions.h

• oalStaticBufferExtension.h

In OS X you have this additional header file:

• MacOSX_OALExtensions.h

AVFoundation.framework

The AVFoundation framework provides an Objective-C interface for playing back audio with the control needed by most applications.

CoreAudioKit.framework

The Core Audio Kit framework contains APIs used for creating a Cocoa user interface for an audio unit.

• CoreAudioKit.h: Top-level include file for the Core Audio Kit framework.

• AUGenericView.h: Defines a generic Cocoa view class for use with audio units. This is the bare-bones user interface that is displayed if an audio unit doesn't create its own custom interface.

• AUPannerView.h: Defines and instantiates a generic view for use with panner audio units.

CoreMIDI.framework

The Core MIDI framework contains all Core MIDI Services APIs used to implement MIDI support in applications.

• CoreMIDI.h: Top-level include file for the Core MIDI framework.

• MIDIServices.h: Defines the interface used to set up and configure an application to communicate with MIDI devices (through MIDI endpoints, notifications, and so on).

• MIDISetup.h: Defines the interface used to configure or customize the global state of the MIDI system (that is, available MIDI devices, MIDI endpoints, and so on).

• MIDIThruConnection.h: Defines functions to create MIDI play-through connections between MIDI sources and destinations. A MIDI thru connection allows you to daisy-chain MIDI devices, allowing input to one device to pass through to another device as well.

CoreMIDIServer.framework

The Core MIDI Server framework contains interfaces for MIDI drivers.

• CoreMIDIServer.h: Top-level include file for the Core MIDI Server framework.

• MIDIDriver.h: Defines the CFPlugin interface used by MIDI drivers to interact with the Core MIDI Server.