---
title: delegateCallbackQueue
framework: avfoundation
role: symbol
role_heading: Instance Property
path: avfoundation/avcapturebroadcastvideooutput/delegatecallbackqueue
---

# delegateCallbackQueue

The dispatch queue on which all AVCaptureBroadcastVideoOutputDelegate methods will be called.

## Declaration

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

## Discussion

Discussion The value of this property is a dispatch queue on which all delegate method calls will be serialized. If you have not called the setDelegate(_:queue:) method, the value of this property will be nil.

## See Also

### Related Documentation

- [delegate](avfoundation/avcapturebroadcastvideooutput/delegate.md)
- [setDelegate(_:queue:)](avfoundation/avcapturebroadcastvideooutput/setdelegate(_:queue:).md)

### Managing the Output

- [delegate](avfoundation/avcapturebroadcastvideooutput/delegate.md)
- [setDelegate(_:queue:)](avfoundation/avcapturebroadcastvideooutput/setdelegate(_:queue:).md)