---
title: sampleBufferCallbackQueue
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturevideodataoutput/samplebuffercallbackqueue
---

# sampleBufferCallbackQueue

The queue on which the system invokes delegate callbacks.

## Declaration

```swift
var sampleBufferCallbackQueue: dispatch_queue_t? { get }
```

## Discussion

Discussion You set the queue using setSampleBufferDelegate(_:queue:).

## See Also

### Receiving captured video data

- [setSampleBufferDelegate(_:queue:)](avfoundation/avcapturevideodataoutput/setsamplebufferdelegate(_:queue:).md)
- [sampleBufferDelegate](avfoundation/avcapturevideodataoutput/samplebufferdelegate.md)
- [AVCaptureVideoDataOutputSampleBufferDelegate](avfoundation/avcapturevideodataoutputsamplebufferdelegate.md)