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Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/kaudiounitproperty_factorypresets
kAudioUnitProperty_FactoryPresets | Apple Developer Documentation Global Variable k Audio Unit Property _Factory Presets So-called factory presets (as opposed to user-configured presets) are ones supplied with an audio unit by the manufacturer. You choose the active preset by setting the kAudioUnitProperty_PresentPreset property. Availability
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/1534199-general_audio_unit_properties/kaudiounitproperty_hostcallbacks
kAudioUnitProperty_FactoryPresets. So-called factory presets (as opposed to user-configured presets) are ones supplied with an audio unit by the manufacturer. You choose the active preset by setting the kAudioUnitProperty_PresentPreset property. kAudioUnitProperty_FastDispatch. A read-only void * value valid on the audio unit global scope.
Technical Note TN2157: Audio Units - How to correctly …
https://developer.apple.com/library/archive/technotes/tn2157/_index.html
Factory presets can be retrieved from an audio unit by using the method AudioUnitGetProperty with the kAudioUnitProperty_FactoryPresets property. Listing 1 Factory Presets CFArrayRef presets = NULL;
MacOSX-SDKs/AudioUnitProperties.h at master - GitHub
https://github.com/phracker/MacOSX-SDKs/blob/master/MacOSX10.9.sdk/System/Library/Frameworks/AudioUnit.framework/Versions/A/Headers/AudioUnitProperties.h
@constant kAudioUnitProperty_FactoryPresets: Scope: Global: Value Type: CFArray of AUPreset structures: Access: Read: An array of preset structures that provide a name and number for each preset. A factory preset is then chosen using the PresentPreset property. @constant kAudioUnitProperty_ContextName: Scope: Global: Value Type: CFString
Apple Developer Documentation
https://developer.apple.com/documentation/audiotoolbox/kaudiounitproperty_supportednumchannels
A negative value for a field in an AUChannelInfo structure indicates that an input/output bus supports a variable number of channels, as follows: {–1, –1} indicates that a bus supports any number of input or output channels provided that the input and output channel counts match each other. This is the default configuration for effect units.
Destroy FX Audio Unit utilities library
http://destroyfx.org/dfx-au-utilities.html
In the AU API, though, you need to make CFArrays of non-CF type data when you support the kAudioUnitProperty_FactoryPresets property. So for those arrays, you need to define custom callbacks that will properly handle pointers to AUPreset structures as their data items. The lifespan of the array may be greater than the lifespan of the plugin and ...
Audio Unit: iOS中最底层最强大音频控制API - 简书
https://www.jianshu.com/p/24dd0b815311
通过访问音频单元的kAudioUnitProperty_FactoryPresets属性获取可用EQ设置数组。使用它作为kAudioUnitProperty_PresentPreset属性的值来应用设置。 默认情况下，kAudioUnitProperty_MaximumFramesPerSlice属性设置为1024，当屏幕锁定并且显示器休眠时，这是不够的。
Small Workaround for Crashing AU Plugins - Audio Plugins ...
https://forum.juce.com/t/small-workaround-for-crashing-au-plugins/35006
I’ve got some plugins that are crashing below because the presets array is nullptr even after they report a size of 8. Adding a nullptr check seems to fix the problem: in juce_AudioUnitPluginFormat.mm from line 1207 …
iphone - AUGraphInitialize an error code -10868 when ...
https://stackoverflow.com/questions/10478565/augraphinitialize-an-error-code-10868-when-adding-kaudiounitsubtype-reverb2-to
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在 Swift 裡頭呼叫 CFArray - zonble
https://zonble.net/archives/2015_03/1668.php
取得等化器設定的方式，是對 kAudioUnitSubType_AUiPodEQ 類型的 node，要求取得 kAudioUnitProperty_FactoryPresets，你會拿到一個由 AUPresets 組成的 CFArray。你的 table view 就得這麼寫。
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