我正在尝试实时捕获相机帧，以便使用 Firebase ML KIT 进行处理。我已成功显示相机 View ，但似乎无法调用 captureOutput 委托(delegate)函数。
P.s 我是 iOS 开发新手。
private func startLiveVideo() {
self.session.sessionPreset = AVCaptureSession.Preset.photo
let captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
let deviceInput = try! AVCaptureDeviceInput(device: captureDevice!)
self.session.addInput(deviceInput)
let deviceOutput = AVCaptureVideoDataOutput()
deviceOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32BGRA)]
deviceOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
self.session.addOutput(AVCaptureVideoDataOutput())
let imageLayer = AVCaptureVideoPreviewLayer(session: session)
imageLayer.frame = CGRect(x: 0, y: 0, width: self.imageView.frame.size.width + 100, height: self.imageView.frame.size.height)
imageLayer.videoGravity = .resizeAspectFill
imageView.layer.addSublayer(imageLayer)
self.session.startRunning()
}
func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
print("Frame captured")
}
最佳答案
您添加代表
let deviceOutput = AVCaptureVideoDataOutput()
deviceOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32BGRA)]
deviceOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
但在此处添加另一个实例
self.session.addOutput(AVCaptureVideoDataOutput())
所以将其替换为
self.session.addOutput(deviceOutput)
关于ios - captureOutput() 函数从未被调用 swift4，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/56650493/