85 lines
2.5 KiB
Swift
85 lines
2.5 KiB
Swift
//
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// CameraSession+Focus.swift
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// VisionCamera
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//
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// Created by Marc Rousavy on 11.10.23.
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// Copyright © 2023 mrousavy. All rights reserved.
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//
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import AVFoundation
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import Foundation
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extension CameraSession {
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/**
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Focuses the Camera to the specified point. The point must be in the Camera coordinate system, so {0...1} on both axis.
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*/
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func focus(point: CGPoint) throws {
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guard let device = videoDeviceInput?.device else {
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throw CameraError.session(SessionError.cameraNotReady)
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}
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if !device.isFocusPointOfInterestSupported {
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throw CameraError.device(DeviceError.focusNotSupported)
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}
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ReactLogger.log(level: .info, message: "Focusing (\(point.x), \(point.y))...")
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do {
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try device.lockForConfiguration()
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defer {
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device.unlockForConfiguration()
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}
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// Set Focus
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if device.isFocusPointOfInterestSupported {
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device.focusPointOfInterest = point
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device.focusMode = .autoFocus
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}
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// Set Exposure
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if device.isExposurePointOfInterestSupported {
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device.exposurePointOfInterest = point
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device.exposureMode = .autoExpose
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}
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// Remove any existing listeners
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NotificationCenter.default.removeObserver(self,
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name: NSNotification.Name.AVCaptureDeviceSubjectAreaDidChange,
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object: nil)
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// Listen for focus completion
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device.isSubjectAreaChangeMonitoringEnabled = true
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NotificationCenter.default.addObserver(self,
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selector: #selector(subjectAreaDidChange),
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name: NSNotification.Name.AVCaptureDeviceSubjectAreaDidChange,
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object: nil)
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} catch {
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throw CameraError.device(DeviceError.configureError)
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}
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}
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@objc
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func subjectAreaDidChange(notification _: NSNotification) {
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guard let device = videoDeviceInput?.device else {
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return
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}
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try? device.lockForConfiguration()
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defer {
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device.unlockForConfiguration()
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}
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// Reset Focus to continuous/auto
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if device.isFocusPointOfInterestSupported {
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device.focusMode = .continuousAutoFocus
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}
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// Reset Exposure to continuous/auto
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if device.isExposurePointOfInterestSupported {
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device.exposureMode = .continuousAutoExposure
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}
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// Disable listeners
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device.isSubjectAreaChangeMonitoringEnabled = false
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}
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}
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