react-native-vision-camera/ios/CameraView.swift

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//
// CameraView.swift
// Cuvent
//
// Created by Marc Rousavy on 09.11.20.
// Copyright © 2020 Facebook. All rights reserved.
//
import AVFoundation
import Foundation
import UIKit
//
// TODOs for the CameraView which are currently too hard to implement either because of AVFoundation's limitations, or my brain capacity
//
// CameraView+RecordVideo
// TODO: Better startRecording()/stopRecording() (promise + callback, wait for TurboModules/JSI)
// TODO: videoStabilizationMode
// CameraView+TakePhoto
// TODO: Photo HDR
private let propsThatRequireReconfiguration = ["cameraId",
"enableDepthData",
"enableHighResolutionCapture",
"enablePortraitEffectsMatteDelivery",
"preset"]
private let propsThatRequireDeviceReconfiguration = ["fps",
"hdr",
"lowLightBoost",
"colorSpace"]
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// MARK: - CameraView
public final class CameraView: UIView {
// pragma MARK: React Properties
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// props that require reconfiguring
@objc var cameraId: NSString?
@objc var enableDepthData = false
@objc var enableHighResolutionCapture: NSNumber? // nullable bool
@objc var enablePortraitEffectsMatteDelivery = false
@objc var preset: String?
// props that require format reconfiguring
@objc var format: NSDictionary?
@objc var fps: NSNumber?
@objc var hdr: NSNumber? // nullable bool
@objc var lowLightBoost: NSNumber? // nullable bool
@objc var colorSpace: NSString?
// other props
@objc var isActive = false
@objc var torch = "off"
@objc var zoom: NSNumber = 0.0 // in percent
// events
@objc var onInitialized: RCTDirectEventBlock?
@objc var onError: RCTDirectEventBlock?
// zoom
@objc var enableZoomGesture = false {
didSet {
if enableZoomGesture {
addPinchGestureRecognizer()
} else {
removePinchGestureRecognizer()
}
}
}
// pragma MARK: Internal Properties
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internal var isReady = false
/// The serial execution queue for the camera preview layer (input stream) as well as output processing (take photo and record video)
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internal let queue = DispatchQueue(label: "com.mrousavy.camera-queue", qos: .userInteractive, attributes: [], autoreleaseFrequency: .inherit, target: nil)
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// Capture Session
internal let captureSession = AVCaptureSession()
// Inputs
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internal var videoDeviceInput: AVCaptureDeviceInput?
internal var audioDeviceInput: AVCaptureDeviceInput?
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// Outputs
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internal var photoOutput: AVCapturePhotoOutput?
internal var movieOutput: AVCaptureMovieFileOutput?
// CameraView+TakePhoto
internal var photoCaptureDelegates: [PhotoCaptureDelegate] = []
// CameraView+RecordVideo
internal var recordingDelegateResolver: RCTPromiseResolveBlock?
internal var recordingDelegateRejecter: RCTPromiseRejectBlock?
// CameraView+Zoom
internal var pinchGestureRecognizer: UIPinchGestureRecognizer?
internal var pinchScaleOffset: CGFloat = 1.0
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var isRunning: Bool {
return captureSession.isRunning
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}
/// Convenience wrapper to get layer as its statically known type.
var videoPreviewLayer: AVCaptureVideoPreviewLayer {
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// swiftlint:disable force_cast
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return layer as! AVCaptureVideoPreviewLayer
}
override public class var layerClass: AnyClass {
return AVCaptureVideoPreviewLayer.self
}
// pragma MARK: Setup
override public init(frame: CGRect) {
super.init(frame: frame)
videoPreviewLayer.session = captureSession
videoPreviewLayer.videoGravity = .resizeAspectFill
videoPreviewLayer.frame = layer.bounds
NotificationCenter.default.addObserver(self,
selector: #selector(sessionRuntimeError),
name: .AVCaptureSessionRuntimeError,
object: captureSession)
NotificationCenter.default.addObserver(self,
selector: #selector(sessionInterruptionBegin),
name: .AVCaptureSessionWasInterrupted,
object: captureSession)
NotificationCenter.default.addObserver(self,
selector: #selector(sessionInterruptionEnd),
name: .AVCaptureSessionInterruptionEnded,
object: captureSession)
NotificationCenter.default.addObserver(self,
selector: #selector(audioSessionInterrupted),
name: AVAudioSession.interruptionNotification,
object: AVAudioSession.sharedInstance)
}
deinit {
NotificationCenter.default.removeObserver(self,
name: .AVCaptureSessionRuntimeError,
object: captureSession)
NotificationCenter.default.removeObserver(self,
name: .AVCaptureSessionWasInterrupted,
object: captureSession)
NotificationCenter.default.removeObserver(self,
name: .AVCaptureSessionInterruptionEnded,
object: captureSession)
NotificationCenter.default.removeObserver(self,
name: AVAudioSession.interruptionNotification,
object: AVAudioSession.sharedInstance)
}
@available(*, unavailable)
required init?(coder _: NSCoder) {
fatalError("init(coder:) is not implemented.")
}
override public func removeFromSuperview() {
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ReactLogger.log(level: .info, message: "Removing Camera View...")
captureSession.stopRunning()
super.removeFromSuperview()
}
// pragma MARK: Props updating
override public final func didSetProps(_ changedProps: [String]!) {
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ReactLogger.log(level: .info, message: "Updating \(changedProps.count) prop(s)...")
let shouldReconfigure = changedProps.contains { propsThatRequireReconfiguration.contains($0) }
let shouldReconfigureFormat = shouldReconfigure || changedProps.contains("format")
let shouldReconfigureDevice = shouldReconfigureFormat || changedProps.contains { propsThatRequireDeviceReconfiguration.contains($0) }
let willReconfigure = shouldReconfigure || shouldReconfigureFormat || shouldReconfigureDevice
let shouldCheckActive = willReconfigure || changedProps.contains("isActive") || captureSession.isRunning != isActive
let shouldUpdateTorch = willReconfigure || changedProps.contains("torch") || shouldCheckActive
let shouldUpdateZoom = willReconfigure || changedProps.contains("zoom") || shouldCheckActive
if shouldReconfigure || shouldCheckActive || shouldUpdateTorch || shouldUpdateZoom || shouldReconfigureFormat || shouldReconfigureDevice {
queue.async {
if shouldReconfigure {
self.configureCaptureSession()
}
if shouldReconfigureFormat {
self.configureFormat()
}
if shouldReconfigureDevice {
self.configureDevice()
}
if shouldUpdateZoom {
let zoomPercent = CGFloat(max(min(self.zoom.doubleValue, 1.0), 0.0))
let zoomScaled = (zoomPercent * (self.maxAvailableZoom - self.minAvailableZoom)) + self.minAvailableZoom
self.zoom(factor: zoomScaled, animated: false)
self.pinchScaleOffset = zoomScaled
}
if shouldCheckActive && self.captureSession.isRunning != self.isActive {
if self.isActive {
ReactLogger.log(level: .info, message: "Starting Session...")
self.configureAudioSession()
self.captureSession.startRunning()
ReactLogger.log(level: .info, message: "Started Session!")
} else {
ReactLogger.log(level: .info, message: "Stopping Session...")
self.captureSession.stopRunning()
ReactLogger.log(level: .info, message: "Stopped Session!")
}
}
// This is a wack workaround, but if I immediately set torch mode after `startRunning()`, the session isn't quite ready yet and will ignore torch.
self.queue.asyncAfter(deadline: .now() + 0.1) {
if shouldUpdateTorch {
self.setTorchMode(self.torch)
}
}
}
}
}
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internal final func setTorchMode(_ torchMode: String) {
guard let device = videoDeviceInput?.device else {
return invokeOnError(.session(.cameraNotReady))
}
guard var torchMode = AVCaptureDevice.TorchMode(withString: torchMode) else {
return invokeOnError(.parameter(.invalid(unionName: "TorchMode", receivedValue: torch)))
}
if !captureSession.isRunning {
torchMode = .off
}
if device.torchMode == torchMode {
// no need to run the whole lock/unlock bs
return
}
if !device.hasTorch || !device.isTorchAvailable {
if torchMode == .off {
// ignore it, when it's off and not supported, it's off.
return
} else {
// torch mode is .auto or .on, but no torch is available.
return invokeOnError(.device(.torchUnavailable))
}
}
do {
try device.lockForConfiguration()
device.torchMode = torchMode
if torchMode == .on {
try device.setTorchModeOn(level: 1.0)
}
device.unlockForConfiguration()
} catch let error as NSError {
return invokeOnError(.device(.configureError), cause: error)
}
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}
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// pragma MARK: Event Invokers
internal final func invokeOnError(_ error: CameraError, cause: NSError? = nil) {
ReactLogger.log(level: .error, message: "Invoking onError(): \(error.message)")
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guard let onError = self.onError else { return }
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var causeDictionary: [String: Any]?
if let cause = cause {
causeDictionary = [
"code": cause.code,
"domain": cause.domain,
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"message": cause.description,
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"details": cause.userInfo,
]
}
onError([
"code": error.code,
"message": error.message,
"cause": causeDictionary ?? NSNull(),
])
}
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internal final func invokeOnInitialized() {
ReactLogger.log(level: .info, message: "Camera initialized!")
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guard let onInitialized = self.onInitialized else { return }
onInitialized([String: Any]())
}
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}