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# CMSampleBufferSetInvalidateCallback(_:callback:refcon:)

Sets the sample buffer’s invalidation callback.

```
func CMSampleBufferSetInvalidateCallback(_ sbuf: CMSampleBuffer, callback invalidateCallback: CMSampleBufferInvalidateCallback, refcon invalidateRefCon: UInt64) -> OSStatus
```

## Parameters

`sbuf`

The sample buffer being modified.

`invalidateCallback`

Reference to a function to be called during `CMSampleBufferInvalidate`.

`invalidateRefCon`

Reference constant to be passed to `invalidateCallback`.

## Return Value

A result code. See [Sample Buffer Error Codes](/documentation/CoreMedia/sample-buffer-errors).

## Discussion

A sample buffer can only have one invalidation callback. The invalidation callback *isn’t* called during ordinary sample buffer finalization.

## Topics

### Callbacks

[`CMSampleBufferInvalidateCallback`](/documentation/CoreMedia/CMSampleBufferInvalidateCallback)

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


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