iOS虚拟摄像头替换拍照，微信QQ抖音快手，虚拟摄像头替换真实摄像头【jar】

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iOS原生摄像头的基本使用方法。如需更复杂的功能，建议查阅苹果官方AVFoundation框架文档。请注意，虚拟摄像头替换系统摄像头在iOS上需要特殊权限，通常只对企业开发者开放。

import UIKit
import AVFoundation

class CameraViewController: UIViewController {
    private let captureSession = AVCaptureSession()
    private var previewLayer: AVCaptureVideoPreviewLayer!
    private let videoOutput = AVCaptureVideoDataOutput()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupCamera()
    }
    
    private func setupCamera() {
        guard let device = AVCaptureDevice.default(.builtInWideAngleCamera, 
                                                  for: .video, 
                                                  position: .back) else {
            print("无法获取摄像头设备")
            return
        }
        
        do {
            let input = try AVCaptureDeviceInput(device: device)
            if captureSession.canAddInput(input) {
                captureSession.addInput(input)
            }
            
            videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue.global(qos: .userInteractive))
            if captureSession.canAddOutput(videoOutput) {
                captureSession.addOutput(videoOutput)
            }
            
            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
            previewLayer.frame = view.bounds
            previewLayer.videoGravity = .resizeAspectFill
            view.layer.addSublayer(previewLayer)
            
            DispatchQueue.global().async {
                self.captureSession.startRunning()
            }
        } catch {
            print("摄像头初始化错误: \(error.localizedDescription)")
        }
    }
}

extension CameraViewController: AVCaptureVideoDataOutputSampleBufferDelegate {
    func captureOutput(_ output: AVCaptureOutput, 
                      didOutput sampleBuffer: CMSampleBuffer, 
                      from connection: AVCaptureConnection) {
        // 在这里可以处理视频帧数据
    }
}


import AVFoundation
import CoreVideo

class VirtualCameraManager: NSObject {
    private var virtualDevice: AVCaptureDevice!
    private var captureSession: AVCaptureSession!
    private var videoOutput: AVCaptureVideoDataOutput!
    private var timer: Timer?
    private var frameCount = 0
    
    func setupVirtualCamera() {
        let discoverySession = AVCaptureDevice.DiscoverySession(
            deviceTypes: [.builtInWideAngleCamera],
            mediaType: .video,
            position: .unspecified
        )
        
        guard let device = discoverySession.devices.first else {
            print("未找到可用摄像头设备")
            return
        }
        
        do {
            virtualDevice = device
            let input = try AVCaptureDeviceInput(device: device)
            
            captureSession = AVCaptureSession()
            captureSession.sessionPreset = .hd1920x1080
            
            if captureSession.canAddInput(input) {
                captureSession.addInput(input)
            }
            
            videoOutput = AVCaptureVideoDataOutput()
            videoOutput.alwaysDiscardsLateVideoFrames = true
            videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
            
            if captureSession.canAddOutput(videoOutput) {
                captureSession.addOutput(videoOutput)
            }
            
            startGeneratingFrames()
            captureSession.startRunning()
        } catch {
            print("虚拟摄像头初始化失败: \(error)")
        }
    }
    
    private func startGeneratingFrames() {
        timer = Timer.scheduledTimer(withTimeInterval: 1.0/30.0, repeats: true) { [weak self] _ in
            self?.generateFrame()
        }
    }
    
    private func generateFrame() {
        // 生成虚拟帧的逻辑
        frameCount += 1
    }
}


 CoreImage

class FrameProcessor {
    static func process(buffer: CVPixelBuffer, with effect: VideoEffect) -> CVPixelBuffer? {
        let ciImage = CIImage(cvPixelBuffer: buffer)
        
        let context = CIContext(options: nil)
        let filteredImage = effect.apply(to: ciImage)
        
        var outputBuffer: CVPixelBuffer?
        CVPixelBufferCreate(
            kCFAllocatorDefault,
            CVPixelBufferGetWidth(buffer),
            CVPixelBufferGetHeight(buffer),
            kCVPixelFormatType_32BGRA,
            nil,
            &outputBuffer
        )
        
        if let outputBuffer = outputBuffer {
            context.render(filteredImage, to: outputBuffer)
        }
        
        return outputBuffer
    }
}

enum VideoEffect {
    case none
    case grayscale
    case sepia
    case blur(radius: Float)
    
    func apply(to image: CIImage) -> CIImage {
        switch self {
        case .none: return image
        case .grayscale: return image.applyingFilter("CIPhotoEffectMono")
        case .sepia: return image.applyingFilter("CISepiaTone")
        case .blur(let radius): 
            return image.applyingFilter("CIGaussianBlur", parameters: ["inputRadius": radius])
        }
    }
}




import UIKit

class VirtualCameraViewController: UIViewController {
    private let cameraManager = VirtualCameraManager()
    private var previewLayer: AVCaptureVideoPreviewLayer!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setupUI()
        cameraManager.setupVirtualCamera()
    }
    
    private func setupUI() {
        previewLayer = AVCaptureVideoPreviewLayer()
        previewLayer.frame = view.bounds
        previewLayer.videoGravity = .resizeAspectFill
        view.layer.addSublayer(previewLayer)
        
        let switchButton = UIButton(type: .system)
        switchButton.setTitle("切换效果", for: .normal)
        switchButton.frame = CGRect(x: 20, y: 50, width: 100, height: 40)
        switchButton.addTarget(self, action: #selector(switchEffect), for: .touchUpInside)
        view.addSubview(switchButton)
    }
    
    @objc private func switchEffect() {
        // 切换视频效果
    }
}