Kamera mit einem vollen Live-Vorschau-Bildschirm,AVLayerVideoGravityResize passt nicht auf neue Geräte, iOS 10?
previewLayer!.videoGravity = AVLayerVideoGravityResize
ein Bild machen ...
stillImageOutput?.captureStillImageAsynchronously(
from: videoConnection, completionHandler:
das Vollbild wird Live-Vorschau oder genau sollte das Standbild entsprechen.
(Aus Gründen der Klarheit: sagen Sie versehentlich AVLayerVideoGravityResizeAspectFill
verwenden In diesem Fall wird die Live-Vorschau wird nicht das Standbild entsprechen - Sie werden ein „Sprung“ sehen, wie es gedehnt wird..)
jedoch ...
Wenn Sie versuchen, unter dem (so AVLayerVideoGravityResize
mit - der richtigen Wahl) mit iOS10 ...
es funktioniert nicht genau: Sie erhalten einen kleinen Sprung zwischen der Live-Vorschau, und das Standbild. Der eine oder andere ist leicht falsch gestreckt.
Könnte dies eigentlich nur ein Fehler bei einigen Geräten sein? oder in iOS?
(Es funktioniert perfekt - kein Sprung -. Auf alten Geräten, und wenn Sie es mit iOS9 versuchen)
Hat jemand gesehen?
// CameraPlane ... the actual live camera plane per se
import UIKit
import AVFoundation
class CameraPlane:UIViewController
{
var captureSession: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer: AVCaptureVideoPreviewLayer?
fileprivate func fixConnectionOrientation()
{
if let connection = self.previewLayer?.connection
{
let previewLayerConnection : AVCaptureConnection = connection
guard previewLayerConnection.isVideoOrientationSupported else
{
print("strangely no orientation support")
return
}
previewLayerConnection.videoOrientation = neededVideoOrientation()
previewLayer!.frame = view.bounds
}
}
func neededVideoOrientation()->(AVCaptureVideoOrientation)
{
let currentDevice:UIDevice = UIDevice.current
let orientation: UIDeviceOrientation = currentDevice.orientation
var r:AVCaptureVideoOrientation
switch (orientation)
{
case .portrait: r = .portrait
break
case .landscapeRight: r = .landscapeLeft
break
case .landscapeLeft: r = .landscapeRight
break
case .portraitUpsideDown: r = .portraitUpsideDown
break
default: r = .portrait
break
}
return r
}
override func viewDidLayoutSubviews()
{
super.viewDidLayoutSubviews()
fixConnectionOrientation()
}
func cameraBegin()
{
captureSession = AVCaptureSession()
captureSession!.sessionPreset = AVCaptureSessionPresetPhoto
// remember that of course, none of this will work on a simulator, only on a device
let backCamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
var error: NSError?
var input: AVCaptureDeviceInput!
do {
input = try AVCaptureDeviceInput(device: backCamera)
} catch let error1 as NSError
{
error = error1
input = nil
}
if (error != nil)
{
print("probably on simulator? no camera?")
return;
}
if (captureSession!.canAddInput(input) == false)
{
print("capture session problem?")
return;
}
captureSession!.addInput(input)
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if (captureSession!.canAddOutput(stillImageOutput) == false)
{
print("capture session with stillImageOutput problem?")
return;
}
captureSession!.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
// previewLayer!.videoGravity = AVLayerVideoGravityResizeAspect
// means, won't reach the top and bottom on devices, gray bars
// previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
// means, you get the "large squeeze" once you make photo
previewLayer!.videoGravity = AVLayerVideoGravityResize
// works perfectly on ios9, older devices etc.
// on 6s+, you get a small jump between the video live preview and the make photo
fixConnectionOrientation()
view.layer.addSublayer(previewLayer!)
captureSession!.startRunning()
previewLayer!.frame = view.bounds
}
/*Video Gravity.
These string constants define how the video is displayed within a layer’s bounds rectangle.
You use these constants when setting the videoGravity property of an AVPlayerLayer or AVCaptureVideoPreviewLayer instance.
AVLayerVideoGravityResize
Specifies that the video should be stretched to fill the layer’s bounds.
AVLayerVideoGravityResizeAspect
Specifies that the player should preserve the video’s aspect ratio and fit the video within the layer’s bounds.
AVLayerVideoGravityResizeAspectFill
Specifies that the player should preserve the video’s aspect ratio and fill the layer’s bounds.
*/
func makePhotoOn(_ here:UIImageView)
{
// recall that this indeed makes a still image, which is used as
// a new background image (indeed on the "stillImage" view)
// and you can then continue to move the door around on that scene.
if (stillImageOutput == nil)
{
print("simulator, using test image.")
here.image = UIImage(named:"ProductMouldings.jpg")
return
}
guard let videoConnection = stillImageOutput!.connection(withMediaType: AVMediaTypeVideo)
else
{
print("AVMediaTypeVideo didn't work?")
return
}
videoConnection.videoOrientation = (previewLayer!.connection?.videoOrientation)!
stillImageOutput?.captureStillImageAsynchronously(
from: videoConnection, completionHandler:
{
(sampleBuffer, error) in
guard sampleBuffer != nil else
{
print("sample buffer woe?")
return
}
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
let dataProvider = CGDataProvider(data: imageData as! CFData)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: CGColorRenderingIntent.defaultIntent)
let ort = self.neededImageOrientation()
let image = UIImage(cgImage:cgImageRef!, scale:1.0, orientation:ort)
here.image = image
})
}
func neededImageOrientation()->(UIImageOrientation)
{
var n : UIImageOrientation
let currentDevice: UIDevice = UIDevice.current
let orientation: UIDeviceOrientation = currentDevice.orientation
switch orientation
{
case UIDeviceOrientation.portraitUpsideDown:
n = .left
case UIDeviceOrientation.landscapeRight:
n = .down
case UIDeviceOrientation.landscapeLeft:
n = .up
case UIDeviceOrientation.portrait:
n = .right
default:
n = .right
}
return n
}
/*
@IBAction func didPressTakeAnother(sender: AnyObject)
{ captureSession!.startRunning() }
*/
}
Komm schon, muss jeder, der mit der Kamera arbeitet, das gesehen haben ?! – Fattie