---
title: backing
framework: corevideo
role: symbol
role_heading: Instance Property
path: corevideo/cvbuffer/creationattributes/backing-swift.property
---

# backing

Defines how the memory for the pixel buffer backing is allocated. IOSurface backed pixel buffers can be shared between CPU and GPU also across process boundaries. Defaults to Backing.ioSurface.

## Declaration

```swift
var backing: CVBuffer.CreationAttributes.Backing
```