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# CMSampleBufferInvalidateCallback

Client callback called by [`CMSampleBufferInvalidate(_:)`](/documentation/CoreMedia/CMSampleBufferInvalidate(_:)).

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

## Parameters

`sbuf`

The `CMSampleBuffer` being invalidated.

`invalidateRefCon`

Reference constant provided when the callback was set up.

## Discussion

---

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