我正在尝试从相机捕获视频帧并在 UIImageView 上实时显示大量图像。
我尝试为我的 viewcontroller 调整 AVCaptureVideoDataOutputSampleBufferDelegate。
我还实现了 captureOutput，但是 captureOutput 从未被调用。
这是我的代码:
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDelegate {
@IBOutlet weak var imageView: UIImageView!
@IBOutlet var cameraView: UIView!
var selectedImage :UIImage!
let captureSession = AVCaptureSession()
var captureDevice : AVCaptureDevice?
var videoCaptureOutput : AVCaptureVideoDataOutput!
override func viewDidLoad() {
super.viewDidLoad()
captureSession.sessionPreset = AVCaptureSessionPresetLow
self.captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
if(captureDevice != nil){
beginSession()
}
}
func beginSession() {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
self.videoCaptureOutput = AVCaptureVideoDataOutput()
self.videoCaptureOutput.videoSettings = [kCVPixelBufferPixelFormatTypeKey:kCVPixelFormatType_32BGRA]
self.videoCaptureOutput.alwaysDiscardsLateVideoFrames = true
self.captureSession.addOutput(self.videoCaptureOutput)
var err : NSError? = nil
self.captureSession.addInput(AVCaptureDeviceInput(device: self.captureDevice, error: &err))
self.captureSession.sessionPreset = AVCaptureSessionPresetPhoto
if err != nil {
println("error: \(err?.localizedDescription)")
}
var previewLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)
previewLayer?.frame = self.cameraView.layer.bounds
previewLayer?.videoGravity = AVLayerVideoGravityResizeAspectFill
dispatch_async(dispatch_get_main_queue(), { // 2
// 3
self.cameraView.layer.addSublayer(previewLayer)
self.captureSession.startRunning()
});
});
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) {
println("capture delegation called")
var imageProcessor = ImageProcessor()
imageView.image = imageProcessor.imageFromSampleBuffer(sampleBuffer)
}
}
如您所见，我正在尝试处理图像并在 imageview 上显示实时捕获帧，假设我的 ImageProcessor() 工作正常....
非常感谢任何帮助，谢谢。
最佳答案
您的委托(delegate)方法未被调用，因为您根本没有将委托(delegate)设置为 videoCaptureOutput。为此，您必须调用 videoCaptureOutput setSampleBufferDelegate(self ,queue : queue ) 方法，其中队列参数是应在其上调用回调的队列
关于ios - 在 Swift 中，改编了 AVCaptureVideoDataOutputSampleBufferDelegate，但从未调用 captureOutput，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30097642/