react-native-vision-camera/package/ios/Core/CameraSession+Configuration.swift

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//
// CameraSession+Configuration.swift
// VisionCamera
//
// Created by Marc Rousavy on 12.10.23.
// Copyright © 2023 mrousavy. All rights reserved.
//
import AVFoundation
import Foundation
extension CameraSession {
// pragma MARK: Input Device
/**
Configures the Input Device (`cameraId`)
*/
func configureDevice(configuration: CameraConfiguration) throws {
ReactLogger.log(level: .info, message: "Configuring Input Device...")
// Remove all inputs
captureSession.inputs.forEach { input in
captureSession.removeInput(input)
}
videoDeviceInput = nil
#if targetEnvironment(simulator)
// iOS Simulators don't have Cameras
throw CameraError.device(.notAvailableOnSimulator)
#endif
guard let cameraId = configuration.cameraId else {
throw CameraError.device(.noDevice)
}
ReactLogger.log(level: .info, message: "Configuring Camera \(cameraId)...")
// Video Input (Camera Device/Sensor)
guard let videoDevice = AVCaptureDevice(uniqueID: cameraId) else {
throw CameraError.device(.invalid)
}
let input = try AVCaptureDeviceInput(device: videoDevice)
guard captureSession.canAddInput(input) else {
throw CameraError.parameter(.unsupportedInput(inputDescriptor: "video-input"))
}
captureSession.addInput(input)
videoDeviceInput = input
ReactLogger.log(level: .info, message: "Successfully configured Input Device!")
}
// pragma MARK: Outputs
/**
Configures all outputs (`photo` + `video` + `codeScanner`)
*/
func configureOutputs(configuration: CameraConfiguration) throws {
ReactLogger.log(level: .info, message: "Configuring Outputs...")
// Remove all outputs
captureSession.outputs.forEach { output in
captureSession.removeOutput(output)
}
photoOutput = nil
videoOutput = nil
codeScannerOutput = nil
// Photo Output
if case let .enabled(photo) = configuration.photo {
ReactLogger.log(level: .info, message: "Adding Photo output...")
// 1. Add
let photoOutput = AVCapturePhotoOutput()
guard captureSession.canAddOutput(photoOutput) else {
throw CameraError.parameter(.unsupportedOutput(outputDescriptor: "photo-output"))
}
captureSession.addOutput(photoOutput)
// 2. Configure
if photo.enableHighQualityPhotos {
// TODO: In iOS 16 this will be removed in favor of maxPhotoDimensions.
photoOutput.isHighResolutionCaptureEnabled = true
if #available(iOS 13.0, *) {
// TODO: Test if this actually does any fusion or if this just calls the captureOutput twice. If the latter, remove it.
photoOutput.isVirtualDeviceConstituentPhotoDeliveryEnabled = photoOutput.isVirtualDeviceConstituentPhotoDeliverySupported
photoOutput.maxPhotoQualityPrioritization = .quality
} else {
photoOutput.isDualCameraDualPhotoDeliveryEnabled = photoOutput.isDualCameraDualPhotoDeliverySupported
}
}
// TODO: Enable isResponsiveCaptureEnabled? (iOS 17+)
// TODO: Enable isFastCapturePrioritizationEnabled? (iOS 17+)
if photo.enableDepthData {
photoOutput.isDepthDataDeliveryEnabled = photoOutput.isDepthDataDeliverySupported
}
if #available(iOS 12.0, *), photo.enablePortraitEffectsMatte {
photoOutput.isPortraitEffectsMatteDeliveryEnabled = photoOutput.isPortraitEffectsMatteDeliverySupported
}
self.photoOutput = photoOutput
}
// Video Output + Frame Processor
if case .enabled = configuration.video {
ReactLogger.log(level: .info, message: "Adding Video Data output...")
// 1. Add
let videoOutput = AVCaptureVideoDataOutput()
guard captureSession.canAddOutput(videoOutput) else {
throw CameraError.parameter(.unsupportedOutput(outputDescriptor: "video-output"))
}
captureSession.addOutput(videoOutput)
// 2. Configure
videoOutput.setSampleBufferDelegate(self, queue: CameraQueues.videoQueue)
videoOutput.alwaysDiscardsLateVideoFrames = true
self.videoOutput = videoOutput
}
// Code Scanner
if case let .enabled(codeScanner) = configuration.codeScanner {
ReactLogger.log(level: .info, message: "Adding Code Scanner output...")
let codeScannerOutput = AVCaptureMetadataOutput()
// 1. Add
guard captureSession.canAddOutput(codeScannerOutput) else {
throw CameraError.codeScanner(.notCompatibleWithOutputs)
}
captureSession.addOutput(codeScannerOutput)
// 2. Configure
let options = codeScanner.options
codeScannerOutput.setMetadataObjectsDelegate(self, queue: CameraQueues.codeScannerQueue)
try codeScanner.options.codeTypes.forEach { type in
// CodeScanner::availableMetadataObjectTypes depends on the connection to the
// AVCaptureSession, so this list is only available after we add the output to the session.
if !codeScannerOutput.availableMetadataObjectTypes.contains(type) {
throw CameraError.codeScanner(.codeTypeNotSupported(codeType: type.descriptor))
}
}
codeScannerOutput.metadataObjectTypes = options.codeTypes
if let rectOfInterest = options.regionOfInterest {
codeScannerOutput.rectOfInterest = rectOfInterest
}
self.codeScannerOutput = codeScannerOutput
}
// Done!
ReactLogger.log(level: .info, message: "Successfully configured all outputs!")
}
// pragma MARK: Video Stabilization
func configureVideoStabilization(configuration: CameraConfiguration) {
captureSession.outputs.forEach { output in
output.connections.forEach { connection in
if connection.isVideoStabilizationSupported {
connection.preferredVideoStabilizationMode = configuration.videoStabilizationMode.toAVCaptureVideoStabilizationMode()
}
}
}
}
// pragma MARK: Orientation
func configureOrientation(configuration: CameraConfiguration) {
// Set up orientation and mirroring for all outputs.
// Note: Photos are only rotated through EXIF tags, and Preview through view transforms
let isMirrored = videoDeviceInput?.device.position == .front
captureSession.outputs.forEach { output in
if isMirrored {
output.mirror()
}
output.setOrientation(configuration.orientation)
}
}
// pragma MARK: Format
/**
Configures the active format (`format`)
*/
func configureFormat(configuration: CameraConfiguration, device: AVCaptureDevice) throws {
guard let targetFormat = configuration.format else {
// No format was set, just use the default.
return
}
ReactLogger.log(level: .info, message: "Configuring Format (\(targetFormat))...")
let currentFormat = CameraDeviceFormat(fromFormat: device.activeFormat, forDevice: device)
if currentFormat == targetFormat {
ReactLogger.log(level: .info, message: "Already selected active format, no need to configure.")
return
}
// Find matching format (JS Dictionary -> strongly typed Swift class)
let format = device.formats.first { targetFormat.isEqualTo(format: $0, device: device) }
guard let format else {
throw CameraError.format(.invalidFormat)
}
// Set new device Format
device.activeFormat = format
ReactLogger.log(level: .info, message: "Successfully configured Format!")
}
func configurePixelFormat(configuration: CameraConfiguration) throws {
guard case let .enabled(video) = configuration.video,
let videoOutput else {
// Video is not enabled
return
}
// Configure the VideoOutput Settings to use the given Pixel Format.
// We need to run this after device.activeFormat has been set, otherwise the VideoOutput can't stream the given Pixel Format.
let pixelFormatType = try video.getPixelFormat(for: videoOutput)
videoOutput.videoSettings = [
String(kCVPixelBufferPixelFormatTypeKey): pixelFormatType,
]
}
// pragma MARK: Side-Props
/**
Configures format-dependant "side-props" (`fps`, `lowLightBoost`)
*/
func configureSideProps(configuration: CameraConfiguration, device: AVCaptureDevice) throws {
// Configure FPS
if let fps = configuration.fps {
let supportsGivenFps = device.activeFormat.videoSupportedFrameRateRanges.contains { range in
return range.includes(fps: Double(fps))
}
if !supportsGivenFps {
throw CameraError.format(.invalidFps(fps: Int(fps)))
}
let duration = CMTimeMake(value: 1, timescale: fps)
device.activeVideoMinFrameDuration = duration
device.activeVideoMaxFrameDuration = duration
} else {
device.activeVideoMinFrameDuration = CMTime.invalid
device.activeVideoMaxFrameDuration = CMTime.invalid
}
// Configure Low-Light-Boost
if device.automaticallyEnablesLowLightBoostWhenAvailable != configuration.enableLowLightBoost {
guard device.isLowLightBoostSupported else {
throw CameraError.device(.lowLightBoostNotSupported)
}
device.automaticallyEnablesLowLightBoostWhenAvailable = configuration.enableLowLightBoost
}
}
/**
Configures the torch.
The CaptureSession has to be running for the Torch to work.
*/
func configureTorch(configuration: CameraConfiguration, device: AVCaptureDevice) throws {
// Configure Torch
let torchMode = configuration.torch.toTorchMode()
if device.torchMode != torchMode {
guard device.hasTorch else {
throw CameraError.device(.flashUnavailable)
}
device.torchMode = torchMode
if torchMode == .on {
try device.setTorchModeOn(level: 1.0)
}
}
}
// pragma MARK: Zoom
/**
Configures zoom (`zoom`)
*/
func configureZoom(configuration: CameraConfiguration, device: AVCaptureDevice) {
guard let zoom = configuration.zoom else {
return
}
let clamped = max(min(zoom, device.activeFormat.videoMaxZoomFactor), device.minAvailableVideoZoomFactor)
device.videoZoomFactor = clamped
}
// pragma MARK: Exposure
/**
Configures exposure (`exposure`) as a bias that adjusts exposureTime and ISO.
*/
func configureExposure(configuration: CameraConfiguration, device: AVCaptureDevice) {
guard let exposure = configuration.exposure else {
return
}
let clamped = max(min(exposure, device.maxExposureTargetBias), device.minExposureTargetBias)
device.setExposureTargetBias(clamped)
}
// pragma MARK: Audio
/**
Configures the Audio Capture Session with an audio input and audio data output.
*/
func configureAudioSession(configuration: CameraConfiguration) throws {
ReactLogger.log(level: .info, message: "Configuring Audio Session...")
// Prevent iOS from automatically configuring the Audio Session for us
audioCaptureSession.automaticallyConfiguresApplicationAudioSession = false
let enableAudio = configuration.audio != .disabled
// Check microphone permission
if enableAudio {
let audioPermissionStatus = AVCaptureDevice.authorizationStatus(for: .audio)
if audioPermissionStatus != .authorized {
throw CameraError.permission(.microphone)
}
}
// Remove all current inputs
audioCaptureSession.inputs.forEach { input in
audioCaptureSession.removeInput(input)
}
audioDeviceInput = nil
// Audio Input (Microphone)
if enableAudio {
ReactLogger.log(level: .info, message: "Adding Audio input...")
guard let microphone = AVCaptureDevice.default(for: .audio) else {
throw CameraError.device(.microphoneUnavailable)
}
let input = try AVCaptureDeviceInput(device: microphone)
guard audioCaptureSession.canAddInput(input) else {
throw CameraError.parameter(.unsupportedInput(inputDescriptor: "audio-input"))
}
audioCaptureSession.addInput(input)
audioDeviceInput = input
}
// Remove all current outputs
audioCaptureSession.outputs.forEach { output in
audioCaptureSession.removeOutput(output)
}
audioOutput = nil
// Audio Output
if enableAudio {
ReactLogger.log(level: .info, message: "Adding Audio Data output...")
let output = AVCaptureAudioDataOutput()
guard audioCaptureSession.canAddOutput(output) else {
throw CameraError.parameter(.unsupportedOutput(outputDescriptor: "audio-output"))
}
output.setSampleBufferDelegate(self, queue: CameraQueues.audioQueue)
audioCaptureSession.addOutput(output)
audioOutput = output
}
}
}