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