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Optimizing Audio Unit User Experience in Logic Studio
(HTML)
TN2207: How to provide the best user experience with your audio unit in Logic Studio
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Apple Applications, Core Audio |
Technical Notes |
2009-04-23
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AudioChannelLayout - What's the Audio Channel Order when the Layout has a Channel Bitmap?
(HTML)
QA1638: Explains the audio channel order when a channel layout is tagged as kAudioChannelLayoutTag_UseChannelBitmap.
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Core Audio |
Technical Q&As |
2009-04-12
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Audio Device Driver Programming Guide
(HTML)
(PDF)
Explains how to develop kernel-resident drivers for audio devices.
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Hardware & Drivers |
Guides |
2009-03-04
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I/O Kit Framework Reference
(HTML)
Describes the I/O Kit classes that support non-kernel access to I/O Kit objects through the device-interface mechanism.
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Hardware & Drivers |
Reference |
2009-03-04
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Audio Queue - Looping Compressed Audio
(HTML)
QA1636: Discusses the format information required to seamlessly loop compressed audio using Audio Queue.
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Carbon, Cocoa, Core Audio |
Technical Q&As |
2009-02-20
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QuickTime Audio - Easy Frequency Level Metering with MovieAudio APIs
(HTML)
QA1459: Describes how to perform frequency band level metering using MovieAudio metering APIs.
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QuickTime |
Technical Q&As |
2009-01-29
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Audio Export - Encoding AAC Audio For MPEG-4 Export
(HTML)
TN2237: The QT MPEG4 Exporter does not show all options for generating AAC, this TN discusses workarounds.
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Core Audio, QuickTime |
Technical Notes |
2009-01-27
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Creating Core Audio Format (.caf) Files
(HTML)
QA1534: Describes how to use afconvert to create .caf files
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Apple Applications, Core Audio, QuickTime |
Technical Q&As |
2009-01-07
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Kernel Framework Reference
(HTML)
Describes the APIs and classes (including I/O Kit families) that support kernel-resident device drivers.
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Hardware & Drivers |
Reference |
2009-01-06
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Core Audio Data Types Reference
(HTML)
(PDF)
Describes data types and constants used throughout Core Audio.
|
Core Audio |
Reference |
2008-11-19
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Playback of QuickTime movie audio through a multi-channel speaker system
(HTML)
QA1627: Specify a specific pair of channels for QuickTime audio movie playback through a multi-channel speaker system
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QuickTime |
Technical Q&As |
2008-11-05
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QuickTime Audio - Retrieving the correct audio format bit depth value
(HTML)
QA1477: Discusses how to retrieve accurate audio format bit depth.
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QuickTime |
Technical Q&As |
2008-11-05
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Audio File Stream Services Reference
(HTML)
(PDF)
Describes the interface for reading non-random access audio file streams.
|
Core Audio |
Reference |
2008-10-15
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NSSound Class Reference
(HTML)
(PDF)
Describes an object that loads and plays audio files.
|
Cocoa |
Reference |
2008-10-15
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Generating a Non-Maskable Interrupt (NMI)
(HTML)
( )
QA1264: Explains how to generate a non-maskable interrupt (NMI) on modern Macintosh systems.
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Hardware & Drivers |
Technical Q&As |
2008-10-13
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Using the ExtAudioFileSeek and ExtAudioFileTell Functions
(HTML)
QA1609: Describes how to use sample rate correctly when working with audio file positions.
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Core Audio |
Technical Q&As |
2008-09-29
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Retain Counts of io_object_t Objects in IOKit.framework
(HTML)
()
QA1195: Distinguishes between the retain counts of an I/O Kit kernel object and its io_object_t user space proxy.
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Hardware & Drivers |
Technical Q&As |
2008-09-24
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IODeviceTree and the I/O Registry
(HTML)
()
QA1120: Describes the IODeviceTree plane in the Mac OS X I/O Registry.
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Hardware & Drivers |
Technical Q&As |
2008-09-18
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Disabling Processor Cores on a Multi-Core System
(HTML)
()
QA1141: Describes how to disable processor cores on a multi-core system for testing purposes.
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Performance |
Technical Q&As |
2008-09-16
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Extended Audio File Services Reference
(HTML)
(PDF)
Describes an interface for reading and writing audio files with automatic format conversion.
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Core Audio |
Reference |
2008-09-09
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Audio Unit Validation Using the auval Tool
(HTML)
TN2204: Test the conformance of audio units to Audio Unit Services.
|
Core Audio |
Technical Notes |
2008-09-08
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SimpleUserClient
(HTML)
(DMG)
(ZIP)
Shows how to create a user client for an I/O Kit kernel driver.
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Hardware & Drivers |
Sample Code |
2008-08-27
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The Default Output Audio Units
(HTML)
QA1577: Describes the Mac OS X output audio units and their purposes.
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Core Audio |
Technical Q&As |
2008-08-21
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Audio File Services Reference
(HTML)
(PDF)
Describes a C programming interface for reading and writing audio files.
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Carbon, Cocoa, Core Audio |
Reference |
2008-07-08
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Audio Queue Services Reference
(HTML)
(PDF)
Describes a high-level programming interface for recording and playing back audio data.
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Carbon, Core Audio |
Reference |
2008-07-08
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Core Audio Glossary
(HTML)
(PDF)
Defines general digital audio terms as well as terms specific to Apple's Core Audio technology.
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Carbon, Cocoa, Core Audio, Games, General, Hardware & Drivers, MIDI |
Reference |
2008-07-07
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WhackedTV
(HTML)
(DMG)
(ZIP)
A Cocoa version of the venerable HackTV sample code, demonstrating usage of the Sequence Grabber API's
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QuickTime |
Sample Code |
2008-05-09
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Core MIDI Framework Reference
(HTML)
Describes a C API for Mac OS X MIDI system services.
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Core Audio, MIDI |
Reference |
2008-04-08
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Core MIDI Server Framework Reference
(HTML)
Describes the Mac OS X MIDI driver interface.
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Core Audio, MIDI |
Reference |
2008-04-08
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Disc Recording Framework Reference
(HTML)
Describes the Objective-C and C API for burning audio and data CDs and DVDs.
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Carbon, Cocoa |
Reference |
2008-04-08
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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.
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Carbon, Cocoa |
Reference |
2008-04-08
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FireWire Audio User Library Framework Reference
(HTML)
Describes the API that supports user-space access to FireWire audio devices and enables the creation of virtual FireWire audio devices.
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Hardware & Drivers |
Reference |
2008-04-08
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Audio Units: Embedding a Carbon View in a Cocoa Window
(HTML)
TN2213: Carbon-Cocoa Integration for Audio Units
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Core Audio |
Technical Notes |
2008-02-29
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QTAudioContextInsert
(HTML)
(DMG)
(ZIP)
Demonstrates use of Audio Context Insert APIs to perform custom processing on QuickTime's audio stream.
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QuickTime |
Sample Code |
2008-01-21
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The Sonogram View Demo Audio Unit
(HTML)
TN2200: Describes the advanced audio unit features that the associated sample project demonstrates.
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Core Audio |
Technical Notes |
2007-11-07
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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.
|
Core Audio |
Reference |
2007-10-31
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Audio Queue Services Programming Guide
(HTML)
(PDF)
Describes how to play and record audio using Audio Queue Services.
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Carbon, Cocoa, Core Audio |
Guides |
2007-10-31
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Audio Unit Programming Guide
(HTML)
(PDF)
Explains how to use Core Audio frameworks and the Core Audio SDK to create audio units.
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Apple Applications, Carbon, Cocoa, Core Audio |
Guides |
2007-10-31
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DiscRecording Release Notes
(HTML)
Updated for Mac OS X v10.5
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Carbon, Cocoa |
Release Notes |
2007-10-31
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How do I create a QuickTime movie from PCM audio samples in memory?
(HTML)
QA1539: How to create a QuickTime movie from PCM audio samples in memory
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QuickTime |
Technical Q&As |
2007-08-29
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AudioConverter: How do I know when I am done?
(HTML)
QA1532: Describes how to correctly signal AudioConverter when a conversion is completed.
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Core Audio |
Technical Q&As |
2007-08-23
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CAPlayThrough
(HTML)
(DMG)
(ZIP)
Illustrates how to use the HAL's Audio Output Unit (AUHAL) for device input and the Default Output Audio Unit for output.
|
Core Audio |
Sample Code |
2007-08-22
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How to handle kAudioUnitProperty_MaximumFramesPerSlice
(HTML)
QA1533: Illustrates how to use the kAudioUnitProperty_MaximumFramesPerSlice property
|
Core Audio |
Technical Q&As |
2007-07-16
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AudioQueueTools
(HTML)
(DMG)
(ZIP)
Demonstrates usage of the AudioQueue API
|
Core Audio |
Sample Code |
2007-06-08
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Unable to select input device in AU Lab
(HTML)
QA1526: AU Lab only supports physical device singletons.
|
Core Audio, Hardware & Drivers |
Technical Q&As |
2007-05-17
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RecordAudioToFile
(HTML)
(DMG)
(ZIP)
Demonstrates recording audio to an AAC file using Core Audio
|
Carbon, Core Audio, Games, Performance |
Sample Code |
2007-02-27
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The header file 'alut.h' is missing from the OpenAL framework.
(HTML)
QA1504: ALUT headers were removed from OpenAL.framework with the Xcode 2.4. This Q&A describes how to regain access to those system-supplied symbols
|
Carbon |
Technical Q&As |
2007-02-06
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Core Audio Overview
(HTML)
(PDF)
Provides an overview of Core Audio and its programming interfaces.
|
Apple Applications, Carbon, Cocoa, Core Audio, Games |
Guides |
2007-01-08
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Standard Audio - Parsing the kQTSCAudioPropertyID_CodecSpecificSettingsArray property
(HTML)
QA1437: Discusses how to parse the kQTSCAudioPropertyID_CodecSpecificSettingsArray property returned from StdAudio. Also see Q&A 1390.
|
QuickTime |
Technical Q&As |
2006-11-30
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Using AudioDeviceRead in Mac OS 10.4
(HTML)
TN2113: How to use AudioBufferLists with AudioDeviceRead in Tiger and beyond.
|
Core Audio, Hardware & Drivers |
Technical Notes |
2006-11-29
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Standard Audio - The CodecSpecificSettingsArray and MagicCookie properties
(HTML)
QA1390: Discusses Core Audio AudioConverter configuration with StdAudio, specifically the CodecSpecificSettingsArray property.
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QuickTime |
Technical Q&As |
2006-11-16
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Playing a sound file using the Default Output Audio Unit
(HTML)
TN2097: Playing an Audio File using the Default Output Audio Unit
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Core Audio |
Technical Notes |
2006-11-15
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Standard Audio - Setting output ASBD returns badFormatErr
(HTML)
QA1489: Discusses why badFormatErr may be returned from Standard Audio
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Core Audio, QuickTime |
Technical Q&As |
2006-11-15
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QTExtractAndConvertToAIFF
(HTML)
(DMG)
(ZIP)
Demonstrates using MovieAudioExtraction and an AudioConverter to extract and convert audio to a AIFF file.
|
QuickTime |
Sample Code |
2006-11-08
|
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QTExtractAndConvertToMovieFile
(HTML)
(DMG)
(ZIP)
Demonstrates using MovieAudioExtraction and an AudioConverter to extract and convert audio to a QuickTime movie file.
|
QuickTime |
Sample Code |
2006-11-08
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Audio Toolbox Framework Reference
(HTML)
Describes the Core Audio API to access audio files and convert between linear PCM and compressed audio formats.
|
Core Audio |
Reference |
2006-11-07
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Core Audio Framework Reference
(HTML)
Describes a C API that interfaces with audio hardware and includes data types used throughout Core Audio.
|
Core Audio |
Reference |
2006-11-07
|
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Sound Programming Topics for Cocoa
(HTML)
(PDF)
Explains how to load and play audio data in Cocoa.
|
Cocoa |
Guides |
2006-11-07
|
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TremoloUnit
(HTML)
(DMG)
(ZIP)
Audio unit sample demonstrating how to build an effect unit with a generic view.
|
Carbon, Cocoa, Core Audio |
Sample Code |
2006-10-26
|
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SimplePlayThru
(HTML)
(DMG)
(ZIP)
Use the HAL's Audio Output Unit (AUHAL) for device input and output on a single device (play-thru)
|
Carbon, Core Audio, Hardware & Drivers |
Sample Code |
2006-10-25
|
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Performance Overview
(HTML)
(PDF)
Introduces the factors that determine performance.
|
Performance |
Guides |
2006-10-03
|
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AudioQueueTest
(HTML)
(DMG)
(ZIP)
Demonstrates AudioQueue, an audio playback API introduced in Mac OS X 10.5
|
Carbon, Core Audio |
Sample Code |
2006-08-01
|
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Device input using the HAL Output Audio Unit
(HTML)
TN2091: How to get input from an audio device by using the HAL's Output Audio Unit.
|
Core Audio |
Technical Notes |
2006-07-25
|
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Going Universal: Audio Developers Catch the Wave
(HTML)
Learn how audio developers who built universal binaries of their applications are reaping the benefits.
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Carbon, Cocoa, Core Audio |
Articles |
2006-07-18
|
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MovieAudioExtraction - Extracting all available audio samples
(HTML)
QA1481: Describes how to correct for MovieAudioExtraction missing some audio samples at the end of audio files.
|
QuickTime |
Technical Q&As |
2006-07-18
|
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Changing the volume of audio devices
(HTML)
QA1016: Demonstrates volume controls for audio devices
|
Carbon, Core Audio |
Technical Q&As |
2006-05-02
|
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AudioDeviceNotify
(HTML)
(DMG)
(ZIP)
Demonstrates how to enumerate audio devices attached to the system and how to handle device notifications
|
Carbon, Cocoa, Core Audio |
Sample Code |
2006-04-21
|
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ExtractMovieAudioToAIFF
(HTML)
(DMG)
(ZIP)
Demonstrates how to extract audio from QuickTime Movies and write the data to an AIFF file.
|
Cocoa, QuickTime |
Sample Code |
2006-03-31
|
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CoreAudio Overload Warnings
(HTML)
QA1467: Describes CoreAudio overload warnings what they mean and how to avoid them.
|
Carbon, Cocoa, Core Audio, Performance |
Technical Q&As |
2006-03-29
|
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MovieAudioExtraction - Ensure a Movie is fully loaded before starting an extraction session
(HTML)
QA1469: Describes the importance of making sure a Movie is fully loaded before extracting audio.
|
QuickTime |
Technical Q&As |
2006-03-29
|
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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
|
Cocoa, Core Audio |
Technical Q&As |
2006-03-29
|
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Apple Core Audio Format Specification 1.0
(HTML)
(PDF)
Specifies the Apple Core Audio Format (CAF) for audio files.
|
Apple Applications, Core Audio |
Reference |
2006-03-08
|
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The "packages" node in the device tree
(HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
|
Hardware & Drivers |
Technical Q&As |
2006-02-22
|
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SillyFrequencyLevels
(HTML)
(DMG)
(ZIP)
Demonstrates how to obtain audio frequency levels from a Movie using SetMovieAudioFrequencyMeteringNumBands and GetMovieAudioFrequencyLevels APIs.
|
QuickTime |
Sample Code |
2006-01-25
|
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QuickTime Media Types and Media Handlers Guide
(HTML)
(PDF)
Describes video, sound, text, time code, and tween media handlers.
|
QuickTime |
Guides |
2006-01-10
|
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QuickTime Music Architecture Guide
(HTML)
(PDF)
Explains how to enable synthesizing and playing of sounds and musical sequences.
|
Carbon, QuickTime |
Guides |
2006-01-10
|
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SimpleAudioExtraction
(HTML)
(DMG)
(ZIP)
Demonstrates the QuickTime 7.0 Movie Audio Extraction APIs
|
QuickTime |
Sample Code |
2006-01-03
|
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Using the Audio Extraction API in QuickTime 7
(HTML)
Learn how your application can extract audio from multiple sound tracks in a QuickTime movie.
|
QuickTime |
Articles |
2005-12-19
|
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The Sound of Opportunity Knocking: The Audio Units Community Takes Off
(HTML)
Learn how one developer created a successful business using audio units.
|
Carbon, Cocoa, Core Audio |
Articles |
2005-10-31
|
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Sound Manager Codec support in QuickTime 7
(HTML)
QA1448: Describes QuickTime 7 support for constant bitrate and variable bitrate Sound Manager codecs
|
QuickTime |
Technical Q&As |
2005-10-26
|
|
AudioCDSample
(HTML)
(DMG)
(ZIP)
Demonstrates how to discover audio CDs and access the TOC information presented by the CD-DA filesystem.
|
Hardware & Drivers |
Sample Code |
2005-10-04
|
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Taking Advantage of the Accelerate Framework
(HTML)
Learn how your application can run on PowerPC- or Intel-based Macs without processor-specific customization.
|
Performance |
Articles |
2005-10-03
|
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QTAudioExtractionPanel
(HTML)
(DMG)
(ZIP)
Enhances the QTKitPlayer to add an Audio Channel Mapping and Extraction panel
|
Core Audio, QuickTime |
Sample Code |
2005-06-27
|
|
FilterDemo
(HTML)
(DMG)
(ZIP)
Demonstrates how to write a filter AudioUnit with a custom Cocoa User Interface.
|
Core Audio |
Sample Code |
2005-06-01
|
|
OpenALExample
(HTML)
(DMG)
(ZIP)
Basic example showing OpenAL usage in a 2D OpenGL environment
|
Games |
Sample Code |
2005-06-01
|
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Handling Audio Unit Events
(HTML)
TN2104: This technote explains how to handle AudioUnit Events
|
Carbon, Cocoa, Core Audio |
Technical Notes |
2005-04-29
|
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Determine the version of an Audio Unit
(HTML)
QA1408: Determine the version of an Audio Unit
|
Core Audio |
Technical Q&As |
2005-03-07
|
|
SampleUSBAudioPlugin
(HTML)
(DMG)
(ZIP)
USB audio plugin that performs a lowpass filtering operation on audio streamed through an audio USB Device.
|
Hardware & Drivers |
Sample Code |
2005-03-07
|
|
Turn up the Volume with Audio Units
(HTML)
Learn to build a sample volume unit, test it, and integrate it into GarageBand.
|
Carbon, Cocoa, Core Audio |
Articles |
2005-01-31
|
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Obtaining the name of an external MIDI Device from a MIDI Endpoint
(HTML)
QA1374: Get the names of external MIDI Devices from MIDI Endpoints.
|
Hardware & Drivers, MIDI |
Technical Q&As |
2004-12-01
|
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Avoiding Pauses When Looping Audio files with QuickTime
(HTML)
QA1371: Demonstrates how to avoid pauses when looping audio files with QuickTime
|
Games |
Technical Q&As |
2004-09-08
|
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dist_fft
(HTML)
(DMG)
(ZIP)
Gigaelement FFTs on Apple G5 clusters
|
Performance |
Sample Code |
2004-08-23
|
|
The System Sound APIs for Mac OS X 10.2, 10.3 and later
(HTML)
TN2102: Discusses the System Sound APIs for correctly playing Alerts and User Interface Sound Effects
|
Carbon, Core Audio |
Technical Notes |
2004-07-13
|
|
Available FireWire Isochronous Bandwidth
(HTML)
QA1356: Discusses attempting to "pre-flight" an isochronous bandwidth allocation request by reading the currently available bandwidth.
|
Hardware & Drivers |
Technical Q&As |
2004-07-07
|
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Using the 3DMixer Audio Unit
(HTML)
TN2112: Discusses how to use Core Audio's 3DMixer version 2.0
|
Carbon, Core Audio, Games |
Technical Notes |
2004-06-14
|
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Signaling the end of data when using AudioConverterFillComplexBuffer
(HTML)
QA1317: How to signal the end of data when using AudioConverterFillComplexBuffer to convert audio data.
|
Core Audio |
Technical Q&As |
2004-04-26
|
|
Audio Unit Resizing
(HTML)
QA1343: Discusses the host's responsibilities when resizing Audio Units.
|
Core Audio |
Technical Q&As |
2004-03-23
|
|
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.
|
Cocoa, Core Audio |
Technical Q&As |
2004-02-04
|
|
Music Player Sequence Destinations
(HTML)
()
QA1330: Provides clarification on MIDI Endpoints and assigning MIDI data flow.
|
MIDI |
Technical Q&As |
2004-01-15
|
|
AudioDevice sample rates
(HTML)
QA1196: Getting, setting and converting sample rates with Audio Devices.
|
Core Audio |
Technical Q&As |
2003-12-09
|
