AVFoundation 错误代码

Question

我在拍摄 RAW 和 JPEG 照片时收到以下两条错误消息。我无法诊断这些：

Error capturing photo: Error Domain=AVFoundationError- Domain Code=-11800 "The operation could not be completed" Userlnfo={NSLocalizedFailur- eReason=An unknown erroroccurred (42686), NSLocalizedDescription:The operation could not be completed, NSUnderlyingEr- ror=0x1c804bfa0 {Error Domain=NSOSStatusError- Domain Code=-12686 "(null)"}}

还有...

Error capturing photo: Error Domain=AVFoundationError-Domain Code=-11800 The operation could not be completed" UserInfo.{NSLocalized-FailureReason=An unknown error occurred (-16802), NSLocalizedDescription=The operation could not be completed, NSUnderlyingEr-ror=0x1c4243f30 {Error Domain=NSOSStatusError-Domain Code=-16802 "(null)"}}

这似乎发生在 AVCapturePhotoCaptureDelegate 中的这个函数之后：

optional func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?)

这些似乎是在重复拍摄照片时随机发生的。

更新

RAW 设置

       func updatePhotoSettings () {
self.photoOutput.setPreparedPhotoSettingsArray([])

let newPhotoSettings = AVCapturePhotoSettings(rawPixelFormatType: OSType(self.photoOutput.availableRawPhotoPixelFormatTypes.first!),
                                                          processedFormat: [AVVideoCodecKey : AVVideoCodecJPEG])
            newPhotoSettings.previewPhotoFormat = [kCVPixelBufferPixelFormatTypeKey as String: self.photoOutput.availablePhotoPixelFormatTypes[0]]
            if #available(iOS 11.0, *) {
                newPhotoSettings.embeddedThumbnailPhotoFormat =  [AVVideoCodecKey: self.photoOutput.availablePhotoCodecTypes[0]]
            }
            newPhotoSettings.isHighResolutionPhotoEnabled = true
            newPhotoSettings.flashMode = self.flashMode
            newPhotoSettings.isAutoStillImageStabilizationEnabled = false
            newPhotoSettings.livePhotoMovieFileURL = nil
            self.photoOutput.photoSettingsForSceneMonitoring = newPhotoSettings

            self.photoOutput.setPreparedPhotoSettingsArray([newPhotoSettings])

}

捕获调用：

final func snapImage () {

            let photoCaptureDelegate = PhotoCaptureDelegate(with: self.photoOutput.preparedPhotoSettingsArray.first!,
                                       willCapturePhotoAnimation: {
                //Shutter animation
                DispatchQueue.main.async { [unowned self] in
                    self.previewView.videoPreviewLayer.opacity = 0
                    UIView.animate(withDuration: 0.1, animations: {
                        self.previewView.videoPreviewLayer.opacity = 1
                    })
                }

            }, didCapturePhoto: {

                //Photo Saved animation

            }, completed:  { [unowned self] photoCaptureDelegate in
                self.inProgressPhotoCaptureDelegates[photoCaptureDelegate.requestedPhotoSettings.uniqueID] = nil
            })


            self.inProgressPhotoCaptureDelegates[photoCaptureDelegate.requestedPhotoSettings.uniqueID] = photoCaptureDelegate

            self.photoOutput.capturePhoto(with: self.photoOutput.preparedPhotoSettingsArray.first!, delegate: photoCaptureDelegate)

            DispatchQueue.main.async {
                //Goes to update photo settings for next shot
                self.updatePhotoSettings()
            }
        }
    }

照片拍摄代表

import AVFoundation
import Photos
import MobileCoreServices

class PhotoCaptureDelegate: NSObject, AVCapturePhotoCaptureDelegate {


         private(set) var requestedPhotoSettings     : AVCapturePhotoSettings

         private let willCapturePhotoAnimation       : () -> ()
         private let didCapturePhoto                 : () -> ()
         private let completed                       : (PhotoCaptureDelegate) -> ()

         private var jpegPhotoData                   : Data?

         private var dngPhotoData                    : Data?


    // MARK: - Initialization
    init(with requestedPhotoSettings: AVCapturePhotoSettings,
        willCapturePhotoAnimation: @escaping () -> (),
        didCapturePhoto: @escaping () -> (),
        completed: @escaping (PhotoCaptureDelegate) -> ())
    {
        self.requestedPhotoSettings = requestedPhotoSettings
        self.willCapturePhotoAnimation = willCapturePhotoAnimation
        self.didCapturePhoto = didCapturePhoto
        self.completed = completed
    }


    private final func didFinish() {
        self.completed(self)
    }

    // MARK: - Will Capture
    final func capture(_ captureOutput: AVCapturePhotoOutput, willCapturePhotoForResolvedSettings resolvedSettings: AVCaptureResolvedPhotoSettings) {
        willCapturePhotoAnimation()
    }

    final func capture(_ output: AVCapturePhotoOutput, willBeginCaptureForResolvedSettings resolvedSettings: AVCaptureResolvedPhotoSettings) {

    }


    // MARK: - iOS 11 Did Finish Photo
    @available(iOS 11.0, *)
    final func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {

            if let error = error {

                PhotoCaptureDelegate.showError(sentMessage: "Error processing photo: \(error)")
                self.didCapturePhoto()

            } else {

                if photo.isRawPhoto {
                    self.dngPhotoData = photo.fileDataRepresentation()
                    return

                } else {
                    if self.jpegPhotoData == nil {
                        self.jpegPhotoData = photo.fileDataRepresentation()
                        self.didCapturePhoto()
                        return
                    }
                }
            }
    }


    // MARK: - Did Finish Capture
    final func capture(_ captureOutput: AVCapturePhotoOutput, didFinishCaptureForResolvedSettings resolvedSettings: AVCaptureResolvedPhotoSettings, error: Error?) {

        if let error = error {
            PhotoCaptureDelegate.showError(sentMessage: "Error capturing photo: \(error)")
            didFinish()
            return


        if PHPhotoLibrary.authorizationStatus() == .authorized {

                var temporaryDNGFileURL : URL? = nil
                self.dngPhotoData != nil {
                        temporaryDNGFileURL = URL(fileURLWithPath: NSTemporaryDirectory().appending("\(resolvedSettings.uniqueID).dng"))
                        do {
                            try self.dngPhotoData!.write(to: temporaryDNGFileURL!, options: [.atomic])
                        } catch let error as NSError {
                            PhotoCaptureDelegate.showError(sentMessage: "Could not write DNG Data: \(error)")
                            return
                        }
                }

                PHPhotoLibrary.shared().performChanges({
                    let creationRequest = PHAssetCreationRequest.forAsset()
                    if (self.jpegPhotoData != nil) {

                        creationRequest.addResource(with: .photo, data: self.jpegPhotoData!, options: nil)

                        if let temporaryDNGFileURL = temporaryDNGFileURL {

                            let companionDNGResourceOptions = PHAssetResourceCreationOptions()
                            companionDNGResourceOptions.shouldMoveFile = true
                            creationRequest.addResource(with: .alternatePhoto, fileURL: temporaryDNGFileURL, options: companionDNGResourceOptions)

                        }
                    }
                }, completionHandler: { [unowned self] success, error in

                    if let error = error {
                        PhotoCaptureDelegate.showError(sentMessage: "Error occurered while saving photo to photo library: \(error)")
                    }
                    if (temporaryDNGFileURL != nil) {
                        if FileManager.default.fileExists(atPath: temporaryDNGFileURL!.path) {
                            do {
                                try FileManager.default.removeItem(at: temporaryDNGFileURL!)
                            } catch let error as NSError {
                                PhotoCaptureDelegate.showError(sentMessage: "Could not remove DNG File: \(error)")
                            }
                        }
                    }

                })


            }

        else {
            PhotoCaptureDelegate.showError(sentMessage: "Not authorized to save photo")
            self.didFinish()
            return
        }

}



    private static func showError (sentMessage: String) {
        let alertController = UIAlertController(title: nil, message: sentMessage, preferredStyle: UIAlertControllerStyle.alert)
        let cancelAction = UIAlertAction(title: NSLocalizedString("OK", comment: "Alert button title."), style: UIAlertActionStyle.cancel, handler: nil)
        alertController.addAction(cancelAction)
        let appDelegate  = UIApplication.shared.delegate as! AppDelegate
        appDelegate.window!.rootViewController!.present(alertController, animated: true, completion: nil)
    }

}

注意事项

Apple 的 AVCam 示例代码紧随其后。
此崩溃仅在更成功的照片拍摄之一之后发生。生成的 RAW 文件非常好。

Answer 1

更新

您在图像捕获完成之前调用 updatePhotoSettings()，这会导致错误。尝试从完成处理程序或在拍摄图像之前执行此操作。

p.s。真的 AVFoundation 应该让这个错误更难犯或者至少更清楚这是行不通的。

之前的错误猜测

您没有显示如何配置 AVCaptureSession 这很重要，但是

如果您启用 AVCapturePhotoSettings isHighResolutionPhotoEnabled，您还需要启用 isHighResolutionCaptureEnabled（对您来说可能是 highResolutionCaptureEnabled - [= 是什么版本49=] 你在用吗？):
```
self.photoOutput.isHighResolutionCaptureEnabled = true
```
您的 PhotoCaptureDelegate 看起来超出了范围，这无济于事。把它赋值给一个成员变量，可以延长它的寿命。
在 AVCaptureSession

.photo

AVFoundation 错误代码

AVFoundation Error Codes

error-handling

avfoundation

ios

swift

avcapturephotosettings

注意事项