Swift

Question

我目前正在尝试为我的应用程序实现摄像头实时馈送。我已经设置好了，但不知怎么的，它没有按预期工作。据我所知，每次识别帧时都应该执行 captureOutput 并且打印消息应该在控制台中输出，但不知何故它不是 - 控制台不会显示打印命令。

有人在代码中看到任何可能的错误吗？

我不知道这是否与我的问题有关，但在应用程序启动时，控制台显示以下内容：

[BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C1.1:2][0x106b24530] get output frames failed, state 8196

import UIKit
import AVKit
import Vision

class CameraViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {    

    override func viewDidLoad() {
        super.viewDidLoad()

        let captureSession = AVCaptureSession()

        guard let captureDevice = AVCaptureDevice.default(for: .video) else { return }
        guard let input = try? AVCaptureDeviceInput(device: captureDevice) else{ return }
        captureSession.addInput(input)

        captureSession.startRunning()

        let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        view.layer.addSublayer(previewLayer)
        previewLayer.frame = view.frame

        let dataOutput = AVCaptureVideoDataOutput()
        dataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
        captureSession.addOutput(dataOutput)

        // let request = VNCoreMLRequest
        // VNImageRequestHandler(cgImage: <#T##CGImage#>, options: [:]).perform(request)
    }

    func captureOutput(_ output: AVCaptureOutput, didDrop sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        print("Es hat funktioniert")
    }

}

Answer 1

您需要实施 captureOutput(_:didOutput:from:) 而不是 captureOutput(_:didDrop:from:)

func captureOutput(_ output: AVCaptureOutput,
                            didOutput sampleBuffer: CMSampleBuffer,
                            from connection: AVCaptureConnection) {
     print("Es hat funktioniert") 
}

Swift - captureOutput 未被执行

Swift - captureOutput is not being executed

ios

avcapture