react-native-vision-camera/package/ios/Extensions/AVCaptureDevice+neutralZoom.swift

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//
// AVCaptureDevice+neutralZoom.swift
// mrousavy
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//
// Created by Marc Rousavy on 10.01.21.
// Copyright © 2021 mrousavy. All rights reserved.
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//
import AVFoundation
extension AVCaptureDevice {
/**
Get the value at which the Zoom factor is neutral.
For normal wide-angle devices, this is always going to be 1.0, since this is the default scale.
For devices with an ultra-wide-angle camera, this value is going to be the value where the wide-angle device will switch over.
*/
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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
}
}