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# AVAudioApplication

An object that manages one or more audio sessions that belong to an app.

```
class AVAudioApplication
```

## Overview

Access the shared audio application instance to control app-level audio operations, such as requesting microphone permission and controlling audio input muting.

## Topics

### Accessing the shared instance

[`shared`](/documentation/AVFAudio/AVAudioApplication/shared)

Accesses the shared audio application instance.

### Requesting audio recording permission

[`requestRecordPermission(completionHandler:)`](/documentation/AVFAudio/AVAudioApplication/requestRecordPermission(completionHandler:))

Determines whether the app has permission to record audio.

[`recordPermission`](/documentation/AVFAudio/AVAudioApplication/recordPermission-swift.property)

The app’s permission to record audio.

[`AVAudioApplication.recordPermission`](/documentation/AVFAudio/AVAudioApplication/recordPermission-swift.enum)

Constants that indicate the app’s permission to record audio.

### Requesting microphone injection permission

[`requestMicrophoneInjectionPermission(completionHandler:)`](/documentation/AVFAudio/AVAudioApplication/requestMicrophoneInjectionPermission(completionHandler:))

Requests the app’s permission to add audio to calls.

[`microphoneInjectionPermission`](/documentation/AVFAudio/AVAudioApplication/microphoneInjectionPermission-swift.property)

A value that indicates an app’s permission to add audio to calls.

[`AVAudioApplication.MicrophoneInjectionPermission`](/documentation/AVFAudio/AVAudioApplication/MicrophoneInjectionPermission-swift.enum)

Constants that indicate an app’s permission to add audio to calls.

### Managing audio input mute state

[`isInputMuted`](/documentation/AVFAudio/AVAudioApplication/isInputMuted)

A Boolean value that indicates whether the app’s audio input is in a muted state.

[`setInputMuted(_:)`](/documentation/AVFAudio/AVAudioApplication/setInputMuted(_:))

Sets a Boolean value that indicates whether the app’s audio input is in a muted state.

[`inputMuteStateChangeNotification`](/documentation/AVFAudio/AVAudioApplication/inputMuteStateChangeNotification)

A notification the system posts when the app’s audio input mute state changes.

[`setInputMuteStateChangeHandler(_:)`](/documentation/AVFAudio/AVAudioApplication/setInputMuteStateChangeHandler(_:))

Sets a callback to handle changes to application-level audio muting states.


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