---
title: CMSampleBufferMakeDataReadyCallback
framework: coremedia
role: symbol
role_heading: Type Alias
path: coremedia/cmsamplebuffermakedatareadycallback
---

# CMSampleBufferMakeDataReadyCallback

Client callback called by CMSampleBufferMakeDataReady(_:).

## Declaration

```swift
typealias CMSampleBufferMakeDataReadyCallback = (CMSampleBuffer, UnsafeMutableRawPointer?) -> OSStatus
```

## Parameters

- `sbuf`: The sample buffer to make ready.
- `makeDataReadyRefcon`: Client refcon provided to CMSampleBufferCreate. For example, it could point at info about the scheduled read that needs to be forced to finish.

## Discussion

Discussion This callback must make the data ready (e.g. force a scheduled read to finish). If this callback succeeds and returns 0, the sample buffer will then be marked as “data ready”.