我在哪里可以找到在OSX中创建FaceTime可比较相机的示例

在OSX中创建FaceTime可比较相机的示例，您可以在苹果的官方开发者文档中找到相关示例代码和指南。苹果提供了名为AVFoundation的框架，它是在iOS和OSX上进行音视频处理的核心框架之一。

FaceTime可比较相机是一种利用前置和后置摄像头同时捕捉视频的技术。以下是一个简单的示例代码，展示了如何在OSX中创建FaceTime可比较相机：

import AVFoundation
import Cocoa

class ViewController: NSViewController {
    var captureSession: AVCaptureSession?
    var frontCamera: AVCaptureDevice?
    var backCamera: AVCaptureDevice?
    var currentCamera: AVCaptureDevice?
    var videoPreviewLayer: AVCaptureVideoPreviewLayer?

    override func viewDidLoad() {
        super.viewDidLoad()
        setupCaptureSession()
        setupDevice()
        setupInputOutput()
        setupPreviewLayer()
        startRunningCaptureSession()
    }

    func setupCaptureSession() {
        captureSession = AVCaptureSession()
        captureSession?.sessionPreset = AVCaptureSession.Preset.photo
    }

    func setupDevice() {
        let deviceDiscoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInWideAngleCamera], mediaType: AVMediaType.video, position: .unspecified)
        let devices = deviceDiscoverySession.devices

        for device in devices {
            if device.position == .front {
                frontCamera = device
            } else if device.position == .back {
                backCamera = device
            }
        }

        currentCamera = frontCamera
    }

    func setupInputOutput() {
        do {
            let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
            captureSession?.addInput(captureDeviceInput)

            let captureOutput = AVCaptureVideoDataOutput()
            captureSession?.addOutput(captureOutput)

            captureOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
        } catch {
            print(error)
        }
    }

    func setupPreviewLayer() {
        videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
        videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
        videoPreviewLayer?.frame = view.layer.bounds
        view.layer.addSublayer(videoPreviewLayer!)
    }

    func startRunningCaptureSession() {
        captureSession?.startRunning()
    }
}

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

这段代码使用AVCaptureSession来设置捕捉会话，AVCaptureDevice来获取前置和后置摄像头，AVCaptureVideoPreviewLayer来显示摄像头捕捉到的视频。您可以根据需要进一步处理视频帧数据。

关于AVFoundation和FaceTime可比较相机的更多详细信息，您可以参考苹果的官方文档：

请注意，以上提供的示例代码和文档链接仅供参考，具体实现方式可能因您的需求和环境而有所不同。