如何使用 AVCapturePhotoOutput
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【中文标题】如何使用 AVCapturePhotoOutput【英文标题】：How to use AVCapturePhotoOutput 【发布时间】：2016-10-18 14:33:39 【问题描述】：我一直在使用自定义相机，最近我升级到 Xcode 8 beta 和 Swift 3。我最初有这个：
var stillImageOutput: AVCaptureStillImageOutput?
但是，我现在收到警告：
“AVCaptureStillImageOutput”在 ios 10.0 中已弃用：改用 AVCapturePhotoOutput
由于这是相当新的，我没有看到太多这方面的信息。这是我当前的代码：
var captureSession: AVCaptureSession?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer: AVCaptureVideoPreviewLayer?
func clickPicture()
if let videoConnection = stillImageOutput?.connection(withMediaType: AVMediaTypeVideo)
videoConnection.videoOrientation = .portrait
stillImageOutput?.captureStillImageAsynchronously(from: videoConnection, completionHandler: (sampleBuffer, error) -> Void in
if sampleBuffer != nil
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
let dataProvider = CGDataProvider(data: imageData!)
let cgImageRef = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
let image = UIImage(cgImage: cgImageRef!, scale: 1, orientation: .right)
)
我曾尝试查看AVCapturePhotoCaptureDelegate，但我不太确定如何使用它。有人知道如何使用这个吗？谢谢。
【问题讨论】：
你需要看 WWDC 2016 session 511 video.. 哦！所以我会看视频，如果可以的话，我会发布答案。谢谢！ 查看the docs 也可能有所帮助。 【参考方案1】：更新到 Swift 4
嗨，它真的很容易使用AVCapturePhotoOutput。
您需要返回CMSampleBuffer 的AVCapturePhotoCaptureDelegate。
如果您告诉AVCapturePhotoSettings previewFormat，您也可以获得预览图像
class CameraCaptureOutput: NSObject, AVCapturePhotoCaptureDelegate
let cameraOutput = AVCapturePhotoOutput()
func capturePhoto()
let settings = AVCapturePhotoSettings()
let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
kCVPixelBufferWidthKey as String: 160,
kCVPixelBufferHeightKey as String: 160]
settings.previewPhotoFormat = previewFormat
self.cameraOutput.capturePhoto(with: settings, delegate: self)
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?)
if let error = error
print(error.localizedDescription)
if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer)
print("image: \(UIImage(data: dataImage)?.size)") // Your Image
欲了解更多信息，请访问https://developer.apple.com/reference/AVFoundation/AVCapturePhotoOutput
注意：您必须在拍照前将AVCapturePhotoOutput 添加到AVCaptureSession。比如：session.addOutput(output)，然后：output.capturePhoto(with:settings, delegate:self) 谢谢@BigHeadCreations
【讨论】：
给出错误：“[AVCapturePhotoOutput capturePhotoWithSettings:delegate:] 没有活动和启用的视频连接”。您能否提供 iOS 10 / Swift 3 的完整示例。 @TuomasLaatikainen 您可能需要将捕获会话预设设置为 AVCaptureSessionPresetPhoto 我观看了视频，浏览了整个网络，重新编写了代码，更换了 iPhone，但无法解决“没有活动和启用的视频连接”异常。 Apple 文档通常含糊不清，缺乏细节。帮助！有工作项目可以分享吗？？ @TuomasLaatikainen 你知道你的问题是什么吗？有同样的问题 @TuomasLaatikainen 您必须在拍照之前将AVCapturePhotoOutput 添加到AVCaptureSession。比如：session.addOutput(output)，然后：output.capturePhoto(with:settings, delegate:self)【参考方案2】：
我在 GitHub 上发现了这个项目，它帮助我了解了设备的初始化和捕获会话。
AVCapturePhotoOutput_test by inoue0426
【讨论】：
【参考方案3】：有我的完整实现
import UIKit
import AVFoundation
class ViewController: UIViewController, AVCapturePhotoCaptureDelegate
var captureSesssion : AVCaptureSession!
var cameraOutput : AVCapturePhotoOutput!
var previewLayer : AVCaptureVideoPreviewLayer!
@IBOutlet weak var capturedImage: UIImageView!
@IBOutlet weak var previewView: UIView!
override func viewDidLoad()
super.viewDidLoad()
captureSesssion = AVCaptureSession()
captureSesssion.sessionPreset = AVCaptureSessionPresetPhoto
cameraOutput = AVCapturePhotoOutput()
let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
if let input = try? AVCaptureDeviceInput(device: device)
if (captureSesssion.canAddInput(input))
captureSesssion.addInput(input)
if (captureSesssion.canAddOutput(cameraOutput))
captureSesssion.addOutput(cameraOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSesssion)
previewLayer.frame = previewView.bounds
previewView.layer.addSublayer(previewLayer)
captureSesssion.startRunning()
else
print("issue here : captureSesssion.canAddInput")
else
print("some problem here")
// Take picture button
@IBAction func didPressTakePhoto(_ sender: UIButton)
let settings = AVCapturePhotoSettings()
let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
let previewFormat = [
kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
kCVPixelBufferWidthKey as String: 160,
kCVPixelBufferHeightKey as String: 160
]
settings.previewPhotoFormat = previewFormat
cameraOutput.capturePhoto(with: settings, delegate: self)
// callBack from take picture
func capture(_ captureOutput: AVCapturePhotoOutput, didFinishProcessingPhotoSampleBuffer photoSampleBuffer: CMSampleBuffer?, previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?)
if let error = error
print("error occure : \(error.localizedDescription)")
if let sampleBuffer = photoSampleBuffer,
let previewBuffer = previewPhotoSampleBuffer,
let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer)
print(UIImage(data: dataImage)?.size as Any)
let dataProvider = CGDataProvider(data: dataImage as CFData)
let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImageOrientation.right)
self.capturedImage.image = image
else
print("some error here")
// This method you can use somewhere you need to know camera permission state
func askPermission()
print("here")
let cameraPermissionStatus = AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo)
switch cameraPermissionStatus
case .authorized:
print("Already Authorized")
case .denied:
print("denied")
let alert = UIAlertController(title: "Sorry :(" , message: "But could you please grant permission for camera within device settings", preferredStyle: .alert)
let action = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(action)
present(alert, animated: true, completion: nil)
case .restricted:
print("restricted")
default:
AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo, completionHandler:
[weak self]
(granted :Bool) -> Void in
if granted == true
// User granted
print("User granted")
DispatchQueue.main.async()
//Do smth that you need in main thread
else
// User Rejected
print("User Rejected")
DispatchQueue.main.async()
let alert = UIAlertController(title: "WHY?" , message: "Camera it is the main feature of our application", preferredStyle: .alert)
let action = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alert.addAction(action)
self?.present(alert, animated: true, completion: nil)
);
【讨论】：
你是如何设置 flashMode 的？ 在 iOS 10.0.2 上工作。用于开启闪光灯settings.flashMode = .on
为什么选择 UIImageOrientation.right ？那么这是 iPad 上的错误方向。
像魅力一样工作:)【参考方案4】：
capture 委托函数已更改为 photoOutput。这是 Swift 4 的更新函数。
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?)
if let error = error
print(error.localizedDescription)
if let sampleBuffer = photoSampleBuffer, let previewBuffer = previewPhotoSampleBuffer, let dataImage = AVCapturePhotoOutput.jpegPhotoDataRepresentation(forJPEGSampleBuffer: sampleBuffer, previewPhotoSampleBuffer: previewBuffer)
print("image: \(String(describing: UIImage(data: dataImage)?.size))") // Your Image
【讨论】：
【参考方案5】：在 iOS 11 中"photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photoSampleBuffer: CMSampleBuffer?, previewPhoto previewPhotoSampleBuffer: CMSampleBuffer?, resolvedSettings: AVCaptureResolvedPhotoSettings, bracketSettings: AVCaptureBracketedStillImageSettings?, error: Error?) " is deprecated。
使用以下方法：
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?)
let imageData = photo.fileDataRepresentation()
if let data = imageData, let img = UIImage(data: data)
print(img)
【讨论】：
【参考方案6】：我采纳了@Aleksey Timoshchenko 的 出色答案并将其更新为Swift 4.x。
请注意，对于我的用例，我允许用户拍摄多张照片，这就是我将它们保存在 images 数组中的原因。
请注意，您需要通过您的storyboard 或在代码中连接@IBAction takePhoto 方法。就我而言，我使用storyboard。
截至iOS 11，@Aleksey Timoshchenko 的答案中使用的AVCapturePhotoOutput.jpegPhotoDataRepresentation 已弃用。
斯威夫特 4.x
class CameraVC: UIViewController
@IBOutlet weak var cameraView: UIView!
var images = [UIImage]()
var captureSession: AVCaptureSession!
var cameraOutput: AVCapturePhotoOutput!
var previewLayer: AVCaptureVideoPreviewLayer!
override func viewDidLoad()
super.viewDidLoad()
override func viewDidAppear(_ animated: Bool)
super.viewDidAppear(animated)
startCamera()
func startCamera()
captureSession = AVCaptureSession()
captureSession.sessionPreset = AVCaptureSession.Preset.photo
cameraOutput = AVCapturePhotoOutput()
if let device = AVCaptureDevice.default(for: .video),
let input = try? AVCaptureDeviceInput(device: device)
if (captureSession.canAddInput(input))
captureSession.addInput(input)
if (captureSession.canAddOutput(cameraOutput))
captureSession.addOutput(cameraOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer.frame = cameraView.bounds
cameraView.layer.addSublayer(previewLayer)
captureSession.startRunning()
else
print("issue here : captureSesssion.canAddInput")
else
print("some problem here")
@IBAction func takePhoto(_ sender: UITapGestureRecognizer)
let settings = AVCapturePhotoSettings()
let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
let previewFormat = [
kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,
kCVPixelBufferWidthKey as String: 160,
kCVPixelBufferHeightKey as String: 160
]
settings.previewPhotoFormat = previewFormat
cameraOutput.capturePhoto(with: settings, delegate: self)
extension CameraVC : AVCapturePhotoCaptureDelegate
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?)
if let error = error
print("error occured : \(error.localizedDescription)")
if let dataImage = photo.fileDataRepresentation()
print(UIImage(data: dataImage)?.size as Any)
let dataProvider = CGDataProvider(data: dataImage as CFData)
let cgImageRef: CGImage! = CGImage(jpegDataProviderSource: dataProvider!, decode: nil, shouldInterpolate: true, intent: .defaultIntent)
let image = UIImage(cgImage: cgImageRef, scale: 1.0, orientation: UIImage.Orientation.right)
/**
save image in array / do whatever you want to do with the image here
*/
self.images.append(image)
else
print("some error here")
【讨论】：
这是最好的答案。它专注于核心方面使其发挥作用！！！ 很好的答案。但是注意fileDataRepresentation()需要iOS11以上是关于如何使用 AVCapturePhotoOutput的主要内容，如果未能解决你的问题，请参考以下文章
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