An Audio Unit app extension gives users a convenient way to create or modify audio in any iOS or macOS app that uses sound, including music production apps such as GarageBand or Logic Pro X.
Audio Unit
An Audio Unit app extension has two main elements: an audio unit proper and a user interface (UI) to control the audio unit. The audio unit itself is a custom plug-in in which you implement an audio creation or an audio processing algorithm. You build the audio unit using the Audio Unit framework, whose APIs are described in Audio Unit Framework Reference. (Designing and building audio units is not covered in the current document, which instead explains how to incorporate an audio unit into an Audio Unit app extension target.) When creating an Audio Unit app extension, you design and create its UI in the storyboard file that is included in the extensionâs Xcode template.
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Figure 6-1 shows the architectural relationships between an audio unit proper and its user interface, which are both contained in the Audio Unit app extension, and between the extension and the host app that is using it.
If you have need to provide an Audio Unit app extension without a UI, you can do so by excluding the audio unit user interface, as suggested by the dashed outline in the figure.
Before you begin
Make sure the Audio Unit extension point is appropriate for your purpose. An Audio Unit app extension provides real-time audio processing that generates an audio stream to send to a host app, or that modifies an audio stream from a host app and sends it back to the host app. Audio Unit app extensions cannot perform recording.
To find out about other types of app extensions you can create, see Table 1-1.
Figure 6-2 shows an example UI for a custom filter Audio Unit app extension. The âdraggable pointâ in the figure is a control that lets the user modify audio unit parameters for resonance and cutoff frequency.
For a video introduction to Audio Unit app extensions, watch the WWDC 2015 presentation Audio Unit Extensions. For a code example that shows how to create an Audio Unit app extension, see AudioUnitV3Example: A Basic AudioUnit Extension and Host Implementation. For more information on the audio unit API, see Audio Unit Framework Reference.
Audio Unit app extensions are supported in iOS 9.0 and later, and in macOS v10.11 and later. The Audio Unit app extension template is available starting in Xcode 7.
How Audio Unit App Extensions Work
In a host app that supports audio units in its audio processing pipeline, a user can choose to use an Audio Unit app extension to add the app extensionâs features to the host app.
Each Audio Unit app extension contains exactly one audio unit. There are four audio unit types you can choose from, according to the role for your app extension:
Table 6-1 summarizes the four variants of Audio Unit app extension you can create, according to the contained audio unit type:
.
For the principal class in an Audio Unit app extension, subclass the
AUViewController class. (If you need to provide an Audio Unit app extension with no UI, subclass the NSObject class instead.) The principal class for your extension must conform to the AUAudioUnitFactory protocol.
Using the Xcode Audio Unit App Extension Template
The Xcode Audio Unit app extension template includes default source files for an
AUAudioUnit subclass for the audio unit itself, an Info.plist file, an AUViewController subclass, and a MainInterface.storyboard Little snitch 3 license key mac. file.
Listing 6-1 shows the Listing 6-1Audio Unit app extension template for an Effect variant
Info.plist keys and values for an iOS Audio Unit app extension for the Effect variant. The type key in this property list specifies the audio unit type that determines the variant, in this case with a value of aufx . For explanations of all the available keys and values, see Table 6-2. https://treefrance229.weebly.com/xbox-controller-driver-built-into-windows.html.
The Audio Unit app extension template includes an Audio Unit Type option that lets you pick among four variants: Instrument, Generator, Effect, and Music Effect. Each of these variants includes a storyboard file for a user interface. If you need to create an app extension without a UI, with any of these variants, perform the following steps after you have created the app extension target:
An Audio Unit app extension has several customizable values in its
Info.plist file, described in Table 6-2.
Designing the User InterfaceCustom Soundboard App Mac Computer
In iOS, a host app defines the size and position of a container view that embeds the remote view controller from the Audio Unit app extension.
For more information on designing app extension user interfaces for iOS, see iOS Human Interface Guidelines.
For macOS, consider the size and position of the selected content in the host app when specifying the size and position of the Audio Unit app extensionâs main view.
For macOS, use the
preferredContentSize property of the NSViewController class to specify the Audio Unit app extension main viewâs preferred size, based on the size of the selected content. (You can also specify minimum and maximum sizes for the extensionâs view, to ensure that a host app doesnât make unreasonable adjustments to the view.) To specify a preferred position for the app extension main view, set the preferredScreenOrigin property to the lower-left corner of the extensionâs view.
For more information on designing app extensions for macOS, see macOS Human Interface Guidelines.
Important
For best results on either platform, use Auto Layout to implement the user interface of an Audio Unit app extension.
![]() Connecting the App Extension UI to the Audio Unit
You must connect your App Extension UIâspecifically, the audio unit user interface codeâto the audio unit proper. Critically, you cannot assume the order in which the extension UI and its associated audio unit are loaded when a host app requests the app extension. The Listing 6-2Connecting the app extension UI to the audio unit
AUViewController subclass must attempt to connect its UI controls to its audio unit parameters when either the UI has been loaded or when the audio unit has been loaded, whichever happens first. Listing 6-2 shows code that attempts to connect the extension UI to its audio unit for both cases.
Overriding AUAudioUnit Properties and MethodsCustom Soundboard App Iphone
You must override the following properties in your
AUAudioUnit subclass:
Also override the
allocateRenderResourcesAndReturnError: method, which the host app calls before it starts to render audio, and override the deallocateRenderResources method, which the host app calls after it has finished rendering audio. Within each override, call the AUAudioUnit superclass implementation.
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Frequently asked questions:Question: What is the point eqMac? What is an Audio Equalizer? Answer:
If if you feel like your audio hardware (headphones, speaker) does not have enough Bass (low frequency) punch, or vice versa, you can adjust that using eqMac. Question: How do you install eqMac? Answer:
Watch THIS VIDEO for a better explanation.
Press the Download button on the home page.
Open the downloaded eqMac.dmg file (if you accidentally closed the window you can always reopen it by Finding it as a Drive in your Finder). Drag the eqMac app into Applications directory. Open eqMac.app from you Applications directory. Macbook SoundboardQuestion: Why is eqMac asking for Admin Password during the first launch? Answer:
The way eqMac works it needs to install an Audio Driver, to do that it needs your system password. Question: Why is eqMac asking for permission to access my microphone?
The app never sees your password as it uses secure Apple API to perform the install. Soundboard Pc AppAnswer:
macOS does not have direct way to access the System Audio stream, so we use the eqMac Audio driver to divert the system audio to the drivers input stream. Question: Sometimes there are sound issues using eqMac? Answer:
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