---
title: metalDevice
framework: videotoolbox
role: symbol
role_heading: Instance Property
path: videotoolbox/vtrawprocessingsession/metaldevice
---

# metalDevice

The preferred device to use for any Metal-based processing performed by the RAW Processing Extension.

## Declaration

```swift
var metalDevice: (any MTLDevice)? { get set }
```

## Discussion

Discussion Setting a value of nil indicates that the client has no preferred Metal device. Getting nil indicates that no preferred device was set or that the processor does not use Metal for frame processing.