[英]Capture photo with AVFoundation in Swift
I'm building a live filter camera app in swift. 我正在迅速构建一个实时滤镜相机应用程序。
I'm changing from AVCaptureVideoDataOutput() to AVCaptureStillImageOutput() to perform the capturing photo function. 我从AVCaptureVideoDataOutput()更改为AVCaptureStillImageOutput()以执行拍摄照片功能。 After I changed, there is no preview view when I open the app.
更改后,打开应用程序时将没有预览视图。
The capture photo function is working, I can hear the capture sound "Ka" when I click the main group area. 拍摄照片功能正在运行,单击主组区域时可以听到拍摄声音“ Ka”。 There is just no view here.
这里没有风景。
Here is my full code 这是我的完整代码
import Foundation
import UIKit
import AVFoundation
import CoreMedia
let CIHueAdjust = "CIHueAdjust"
let CIHueAdjustFilter = CIFilter(name: "CIHueAdjust", withInputParameters: ["inputAngle" : 1.24])
let Filters = [CIHueAdjust: CIHueAdjustFilter]
let FilterNames = [String](Filters.keys).sort()
class LiveCamViewController : UIViewController,AVCaptureVideoDataOutputSampleBufferDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate{
let mainGroup = UIStackView()
let imageView = UIImageView(frame: CGRectZero)
let filtersControl = UISegmentedControl(items: FilterNames)
var videoOutput = AVCaptureStillImageOutput()
override func viewDidLoad()
{
super.viewDidLoad()
view.addSubview(mainGroup)
mainGroup.axis = UILayoutConstraintAxis.Vertical
mainGroup.distribution = UIStackViewDistribution.Fill
mainGroup.addArrangedSubview(imageView)
mainGroup.addArrangedSubview(filtersControl)
mainGroup.addGestureRecognizer(UITapGestureRecognizer(target: self, action:#selector(LiveCamViewController.saveToCamera(_:))))
imageView.contentMode = UIViewContentMode.ScaleAspectFit
filtersControl.selectedSegmentIndex = 0
let captureSession = AVCaptureSession()
captureSession.sessionPreset = AVCaptureSessionPresetPhoto
let backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
do
{
let input = try AVCaptureDeviceInput(device: backCamera)
captureSession.addInput(input)
}
catch
{
print("can't access camera")
return
}
//get captureOutput invoked
let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
view.layer.addSublayer(previewLayer)
videoOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if captureSession.canAddOutput(videoOutput)
{
captureSession.addOutput(videoOutput)
}
captureSession.startRunning()
}
func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!)
{
guard let filter = Filters[FilterNames[filtersControl.selectedSegmentIndex]] else
{
return
}
let pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer)
let cameraImage = CIImage(CVPixelBuffer: pixelBuffer!)
filter!.setValue(cameraImage, forKey: kCIInputImageKey)
let filteredImage = UIImage(CIImage: filter!.valueForKey(kCIOutputImageKey) as! CIImage!)
let fixedImage = correctlyOrientedImage(filteredImage)
dispatch_async(dispatch_get_main_queue())
{
self.imageView.image = fixedImage
}
}
func correctlyOrientedImage(image: UIImage) -> UIImage {
UIGraphicsBeginImageContextWithOptions(image.size, false, image.scale)
image.drawInRect(CGRectMake(0, 0, image.size.width, image.size.height))
let normalizedImage:UIImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
let imageRef: CGImageRef = normalizedImage.CGImage!
let rotatedImage: UIImage = UIImage(CGImage: imageRef, scale: 1.0, orientation: .Right)
return rotatedImage
}
override func viewDidLayoutSubviews()
{
mainGroup.frame = CGRect(x: 37, y: 115, width: 301, height: 481)
}
func saveToCamera(sender: UITapGestureRecognizer) {
videoOutput.outputSettings = [AVVideoCodecKey:AVVideoCodecJPEG]
if let videoConnection = videoOutput.connectionWithMediaType(AVMediaTypeVideo) {
videoOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
(imageDataSampleBuffer, error) -> Void in
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)
UIImageWriteToSavedPhotosAlbum(UIImage(data: imageData)!, nil, nil, nil)
}
}
}
}
Thanks. 谢谢。
If you want to capture photo or video from camera, then you should use UIImagePickerController
instead AVFoundation
. 如果要从相机捕获照片或视频,则应使用
UIImagePickerController
而不是AVFoundation
。 Check Applce documentation for more information about it. 查看Applce文档以获取有关它的更多信息。
Update : 更新:
Refer this link . 请参考此链接 。 It have too many examples of customize
imagePickercontroller
. 它有太多自定义
imagePickercontroller
示例。 and you can refer this and this answer of stackobverflow. 您可以参考这个和这个 stackobverflow的答案。
Hope this will help :) 希望这会有所帮助:)
The problem might be because you don't have a frame for the previewLayer
. 问题可能是因为您没有
previewLayer
的框架。
Type this: 输入:
previewLayer.frame = self.view.bounds
And also explicitly set the video gravity: (I think this is optional) 并显式设置视频重力:(我认为这是可选的)
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill // Or choose some other option if you prefer
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