---
title: "setValidationHandler(_:)"
framework: coremedia
role: symbol
role_heading: Instance Method
path: "coremedia/cmbufferqueue/setvalidationhandler(_:)"
---

# setValidationHandler(_:)

Sets validation handler for the queue to call before enqueuing buffers.

## Declaration

```swift
func setValidationHandler(_ body: @escaping (CMBufferQueue, CMBuffer) throws -> Void)
```