---
title: "setVirtualFormat(_:)"
framework: Core Audio
role: symbol
role_heading: Instance Method
platforms: [macOS 15.0+]
path: "coreaudio/audiohardwarestream/setvirtualformat(_:)"
---

# setVirtualFormat(_:)

Set the virtualFormat property.

## Declaration

```swift
func setVirtualFormat(_ format: AudioStreamBasicDescription) throws
```

## Parameters

- `format`: An AudioStreamBasicDescription that describes the data format in which all IOProcs for the owning device will perform IO transactions.