33 lines
1.0 KiB
Swift
33 lines
1.0 KiB
Swift
|
//
|
||
|
|
// AVCaptureDevice+neutralZoom.swift
|
||
|
|
// Cuvent
|
||
|
|
//
|
||
|
|
// Created by Marc Rousavy on 10.01.21.
|
||
|
|
// Copyright © 2021 Facebook. All rights reserved.
|
||
|
|
//
|
||
|
|
|
||
|
|
import AVFoundation
|
||
|
|
|
||
|
|
extension AVCaptureDevice {
|
||
|
|
var neutralZoomFactor: CGFloat {
|
||
|
|
if #available(iOS 13.0, *) {
|
||
|
|
if let indexOfWideAngle = self.constituentDevices.firstIndex(where: { $0.deviceType == .builtInWideAngleCamera }) {
|
||
|
|
if let zoomFactor = self.virtualDeviceSwitchOverVideoZoomFactors[safe: indexOfWideAngle - 1] {
|
||
|
|
return CGFloat(zoomFactor.doubleValue)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 1.0
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
Get the value at which the Zoom value is neutral, in percent (0.0-1.0)
|
||
|
|
|
||
|
|
* On single-camera physical devices, this value will always be 0.0
|
||
|
|
* On devices with multiple cameras, e.g. triple-camera, this value will be a value between 0.0 and 1.0, where the field-of-view and zoom looks "neutral"
|
||
|
|
*/
|
||
|
|
var neutralZoomPercent: CGFloat {
|
||
|
|
return (neutralZoomFactor - minAvailableVideoZoomFactor) / (maxAvailableVideoZoomFactor - minAvailableVideoZoomFactor)
|
||
|
|
}
|
||
|
|
}
|