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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 |
2009-04-12
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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 |
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 |
2009-01-29
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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 |
2009-01-07
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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 |
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 |
2008-11-05
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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 |
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 |
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 |
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 |
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 |
2008-09-16
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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 |
2008-08-21
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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 |
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 |
2007-08-23
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How to handle kAudioUnitProperty_MaximumFramesPerSlice
(HTML)
QA1533: Illustrates how to use the kAudioUnitProperty_MaximumFramesPerSlice property
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Core Audio |
2007-07-16
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Unable to select input device in AU Lab
(HTML)
QA1526: AU Lab only supports physical device singletons.
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Core Audio, Hardware & Drivers |
2007-05-17
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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
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Carbon |
2007-02-06
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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.
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QuickTime |
2006-11-30
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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 |
2006-11-16
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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 |
2006-11-15
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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.
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QuickTime |
2006-07-18
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Changing the volume of audio devices
(HTML)
QA1016: Demonstrates volume controls for audio devices
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Carbon, Core Audio |
2006-05-02
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CoreAudio Overload Warnings
(HTML)
QA1467: Describes CoreAudio overload warnings what they mean and how to avoid them.
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Carbon, Cocoa, Core Audio, Performance |
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.
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QuickTime |
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
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Cocoa, Core Audio |
2006-03-29
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The "packages" node in the device tree
(HTML)
HW90: Describes the "packages" node in the Open Firmware device tree.
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Hardware & Drivers |
2006-02-22
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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
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QuickTime |
2005-10-26
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Determine the version of an Audio Unit
(HTML)
QA1408: Determine the version of an Audio Unit
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Core Audio |
2005-03-07
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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.
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Hardware & Drivers, MIDI |
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
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Games |
2004-09-08
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Available FireWire Isochronous Bandwidth
(HTML)
QA1356: Discusses attempting to "pre-flight" an isochronous bandwidth allocation request by reading the currently available bandwidth.
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Hardware & Drivers |
2004-07-07
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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.
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Core Audio |
2004-04-26
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Audio Unit Resizing
(HTML)
QA1343: Discusses the host's responsibilities when resizing Audio Units.
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Core Audio |
2004-03-23
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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.
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Cocoa, Core Audio |
2004-02-04
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Music Player Sequence Destinations
(HTML)
()
QA1330: Provides clarification on MIDI Endpoints and assigning MIDI data flow.
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MIDI |
2004-01-15
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AudioDevice sample rates
(HTML)
QA1196: Getting, setting and converting sample rates with Audio Devices.
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Core Audio |
2003-12-09
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AUGraphs and AudioUnit connections
(HTML)
QA1174: Discusses AudioUnit connection issues when using more than one AudioUnit or an AUGraph.
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Core Audio |
2003-12-09
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Installing an I/O Kit KEXT Without Rebooting
(HTML)
QA1319: Describes the state of the art of installing I/O Kit kernel extensions (KEXTs) without requiring a restart.
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Hardware & Drivers |
2003-10-28
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How to handle audio data with magic cookie information
(HTML)
QA1318: How to handle sound files with magic cookies when using an AudioConverter.
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Core Audio |
2003-10-22
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IOKit Framework Headers
(HTML)
()
QA1107: Describes the differences between the headers in IOKit.framework and the I/O Kit headers in Kernel.framework.
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Hardware & Drivers |
2002-01-15
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HID Manager Event Data Underruns
(HTML)
QA1038: Explains how to correctly handle HID Manager event queue data underruns.
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Apple Applications |
2001-06-13
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When to use PCMCIA, PC Card, and CardBus
(HTML)
HW77: Explains the differences between PCMCIA, PC Card, and CardBus.
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Hardware & Drivers |
1999-11-15
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Are the Name Registry device tree nodes unique?
(HTML)
Deprecated - HW64: Discusses whether Name Registry nodes copied from the Open Firmware device tree are unique.
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Hardware & Drivers |
1999-10-11
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Synchronizing Sounds to Video
(HTML)
()
Deprecated - SND19: Enabling regular sound callbacks under Mac OS 9 and Sound Manager 4.0.
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Carbon |
1999-10-05
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Synchronous SysBeep
(HTML)
()
Deprecated - SND18: Obtaining a synchronous SysBeep with Sound Manager 3.1.
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Carbon |
1999-10-05
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MACE Restrictions
(HTML)
()
Deprecated - SND16: MACE algorithms only support the compression of 8-bit offset binary sound.
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Carbon |
1999-06-08
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Difference between using Restart or Shut Down in the Finder's Special menu in Open Firmware
(HTML)
()
HW47: Explains the differences between using Restart or Shut Down on Open Firmware
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Hardware & Drivers |
1999-02-15
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Playing QuickTime 3 Movie Sound Data
(HTML)
()
QTMTB50: Explains why a movie's sound data can continue to play longer than video data.
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QuickTime |
1998-11-09
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Capturing Speech Manager Output
(HTML)
()
Deprecated - SND15: Capturing the output from the Speech Synthesis Manager to a file.
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Carbon |
1998-05-18
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Recording Compressed Sounds
(HTML)
()
Deprecated - SND14: Sound Manager and sound input driver compression options are limited to allow interrupt time recording.
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Carbon |
1998-04-12
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siMonitorSource Selector
(HTML)
()
Deprecated - SND13: Using the sound output siMonitorAvailable, and siMonitorSource selectors.
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Carbon |
1998-04-12
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siOSTypeInput Selectors
(HTML)
()
Deprecated - SND12: The use of siOSTypeInputSource, and siOSTypeInputAvailable selectors and extracting the siOSTypeInputAvailable OSTypes returned.
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Carbon |
1998-04-12
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Setting Audio Input Gain
(HTML)
()
Deprecated - SND11: Setting audio input gain under Mac OS 8.1.
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Carbon |
1998-02-10
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Selecting a specific sound input source
(HTML)
()
Deprecated - SND10: Using the sound input driver to select specific sound input sources.
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Carbon |
1998-01-16
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siOSTypeInputAvailable Format
(HTML)
()
Deprecated - SND09: The format of the data returned by the siOSTypeInputAvailable selector is SoundInfoList.
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Carbon |
1998-01-16
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Making Input Gain Setting Changes
(HTML)
()
Deprecated - SND01: Changing the input gain setting on older Power Macs before recording.
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Carbon |
1996-06-01
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siActive Channels Unsupported on Some Power Macs
(HTML)
()
Deprecated - SND03: siActive Channels is unsupported on some older PowerMacs (siUnknownInfoType returned by SPBGetDeviceInfo).
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Carbon |
1996-06-01
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