[英]In Swift, adapted AVCaptureVideoDataOutputSampleBufferDelegate, but captureOutput never getting called
[英]captureOutput() function is never called swift4
我正在嘗試使用Firebase ML KIT
實時捕捉相機幀。 我已經成功顯示了攝像頭視圖,但我似乎無法調用captureOutput委托函數。
Ps我是iOS開發的新手。
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")
}
您添加委托
let deviceOutput = AVCaptureVideoDataOutput()
deviceOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey as String: Int(kCVPixelFormatType_32BGRA)]
deviceOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
但在這里添加另一個實例
self.session.addOutput(AVCaptureVideoDataOutput())
所以用它替換它
self.session.addOutput(deviceOutput)
轉換到Swift 5之后它運行得很好。
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