---
title: CMBufferCompareCallback
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmbuffercomparecallback
---

# CMBufferCompareCallback

Callback that compares one CMBuffer with another.

## Declaration

```swift
typealias CMBufferCompareCallback = (CMBuffer, CMBuffer, UnsafeMutableRawPointer?) -> CFComparisonResult
```

## Discussion

Discussion You can use a CFComparatorFunction as a callback. Callback parameters

## See Also

### Properties

- [compare](coremedia/cmbuffercallbacks/compare.md)
- [CMBufferGetBooleanCallback](coremedia/cmbuffergetbooleancallback.md)
- [CMBufferGetTimeCallback](coremedia/cmbuffergettimecallback.md)
- [dataBecameReadyNotification](coremedia/cmbuffercallbacks/databecamereadynotification.md)
- [getDecodeTimeStamp](coremedia/cmbuffercallbacks/getdecodetimestamp.md)
- [getDuration](coremedia/cmbuffercallbacks/getduration.md)
- [getPresentationTimeStamp](coremedia/cmbuffercallbacks/getpresentationtimestamp.md)
- [getSize](coremedia/cmbuffercallbacks/getsize.md)
- [isDataReady](coremedia/cmbuffercallbacks/isdataready.md)
- [refcon](coremedia/cmbuffercallbacks/refcon.md)
- [version](coremedia/cmbuffercallbacks/version.md)