---
title: AudioUnitExternalBuffer
framework: audiotoolbox
role: symbol
role_heading: Structure
path: audiotoolbox/audiounitexternalbuffer
---

# AudioUnitExternalBuffer

Allows an audio unit host application to tell an audio unit to use a specified buffer for its input callback.

## Declaration

```swift
struct AudioUnitExternalBuffer
```

## Topics

### Initializers

- [init(buffer:size:)](audiotoolbox/audiounitexternalbuffer/init(buffer:size:).md)

### Instance Properties

- [buffer](audiotoolbox/audiounitexternalbuffer/buffer.md)
- [size](audiotoolbox/audiounitexternalbuffer/size.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)

## See Also

### Structures

- [AudioUnitConnection](audiotoolbox/audiounitconnection.md)
- [AudioUnitEvent](audiotoolbox/audiounitevent.md)
- [AudioUnitFrequencyResponseBin](audiotoolbox/audiounitfrequencyresponsebin.md)
- [AudioUnitMeterClipping](audiotoolbox/audiounitmeterclipping.md)
- [AudioUnitMIDIControlMapping](audiotoolbox/audiounitmidicontrolmapping.md)
- [AudioUnitOtherPluginDesc](audiotoolbox/audiounitotherplugindesc.md)
- [AudioUnitParameter](audiotoolbox/audiounitparameter.md)
- [AudioUnitParameterEvent](audiotoolbox/audiounitparameterevent.md)
- [AudioUnitParameterHistoryInfo](audiotoolbox/audiounitparameterhistoryinfo.md)
- [AudioUnitParameterNameInfo](audiotoolbox/audiounitparameternameinfo.md)
- [AudioUnitParameterIDName](audiotoolbox/audiounitparameteridname.md)
- [AudioUnitParameterInfo](audiotoolbox/audiounitparameterinfo.md)
- [AudioUnitParameterOptions](audiotoolbox/audiounitparameteroptions.md)
- [AudioUnitParameterStringFromValue](audiotoolbox/audiounitparameterstringfromvalue.md)
- [AudioUnitParameterValueFromString](audiotoolbox/audiounitparametervaluefromstring.md)