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# SCStreamOutput

A delegate protocol your app implements to receive capture stream output events.

```
protocol SCStreamOutput : NSObjectProtocol
```

## Overview

The [`SCStreamOutput`](/documentation/ScreenCaptureKit/SCStreamOutput) protocol provides a way to retrieve output from an [`SCStream`](/documentation/ScreenCaptureKit/SCStream).

After you call [`startCapture(completionHandler:)`](/documentation/ScreenCaptureKit/SCStream/startCapture(completionHandler:)), the system provides frame data through the [`stream(_:didOutputSampleBuffer:of:)`](/documentation/ScreenCaptureKit/SCStreamOutput/stream(_:didOutputSampleBuffer:of:)) method. You can inspect the <doc://com.apple.documentation/documentation/CoreMedia/CMSampleBuffer> to retrieve image data, and inspect the sample buffer for metadata about the frame.

## Topics

### Receiving stream output

[`stream(_:didOutputSampleBuffer:of:)`](/documentation/ScreenCaptureKit/SCStreamOutput/stream(_:didOutputSampleBuffer:of:))

Tells the delegate that a capture stream produced a frame.


---

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