---
title: CMSampleBufferInvalidateCallback
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmsamplebufferinvalidatecallback
---

# CMSampleBufferInvalidateCallback

Client callback called by CMSampleBufferInvalidate(_:).

## Declaration

```swift
typealias CMSampleBufferInvalidateCallback = (CMSampleBuffer, UInt64) -> Void
```

## Parameters

- `sbuf`: The CMSampleBuffer being invalidated.
- `invalidateRefCon`: Reference constant provided when the callback was set up.