What is QTCaptureScreenInput?

Question

On a screen-recording github project here, I saw one line of code:

mCaptureScreenInput = [[NSClassFromString(@"QTCaptureScreenInput") alloc] init];

A google search for QTCaptureScreenInput reveals only two mentions on the web, that project and another one with an unused ivar of that type.

What is a QTCaptureScreenInput?

Answer 1

It's a private API. You can see here that QuickTime Player uses it to implement screen recording.