SCStreamOutput
A delegate protocol your app implements to receive capture stream output events.
Declaration
protocol SCStreamOutput : NSObjectProtocolOverview
The SCStreamOutput protocol provides a way to retrieve output from an SCStream.
After you call startCapture(completionHandler:), the system provides frame data through the stream(_:didOutputSampleBuffer:of:) method. You can inspect the CMSampleBuffer to retrieve image data, and inspect the sample buffer for metadata about the frame.