添加GPS元数据字典在AVFoundation采取迅速拍摄的图像
我正在试图添加GPS元数据与AVFoundation拍摄的图像迅速。 我有下面的代码粘贴，但它不工作。 我的错误在哪里？
let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer) let imgDataProvider = CGDataProviderCreateWithCFData(imageData); let imageRef = CGImageCreateWithJPEGDataProvider(imgDataProvider, nil, true, .RenderingIntentDefault) let properties = self.getImageProperties(imageData) let mutableDictionary: NSMutableDictionary = NSMutableDictionary(dictionary: properties) mutableDictionary.setValue(self.getGPSDictionary(), forKey: kCGImagePropertyGPSDictionary as String) let newImageData = CFDataCreateMutable(nil, 0) let type = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, "image/jpg" as CFString, kUTTypeImage) let destination = CGImageDestinationCreateWithData(newImageData, (type?.takeRetainedValue())!, 1, nil) CGImageDestinationAddImage(destination!, imageRef!, mutableDictionary) CGImageDestinationFinalize(destination!) let newImage = newImageData
getImageProperties方法：
private func getImageProperties(data: NSData) -> NSDictionary { let imageSourceRef = CGImageSourceCreateWithData(data, nil); let properties = CGImageSourceCopyPropertiesAtIndex(imageSourceRef!, 0, nil) let props = properties return props! }
getGPSDictionary方法：
private func getGPSDictionary() -> NSDictionary { let dictionary = [kCGImagePropertyGPSLatitude as String :"54",kCGImagePropertyGPSLongitude as String :"23"] return dictionary }
是的，我知道坐标硬编码到目前为止，但重要的是要使其工作，我将更新位置。
这就是我做的。 这工作在Swift 2.2 iOS 9.2上
@IBAction func shutter(sender: AnyObject) { let connection = imageOutput.connectionWithMediaType(AVMediaTypeVideo) // set the orientation if connection.supportsVideoOrientation { connection.videoOrientation = currentVideoOrientation() } imageOutput.captureStillImageAsynchronouslyFromConnection(connection) { (sampleBuffer: CMSampleBuffer!, error: NSError!) -> Void in if sampleBuffer != nil { let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer) // get the old EXIF let oldEXIF = self.getEXIFFromImage(imageData) // add gps info to the old exif let newEXIF = self.addGPSToEXIF(oldEXIF, new: self.getGPSDictionaryForLocation(Genba.sharedInstance.gps.currentLocation)) // resize the image to desired let resized = self.resizeNSDataImage(imageData, newSize: Genba.sharedInstance.imageSize) // attach the new exif to the resized image let attached = self.attachEXIFtoImage(resized, EXIF: newEXIF) // save the file to the camera roll and inside the app self.saveFile(attached) } else { debugPrint(self.n,#line,"Error capturing photo \(error.localizedDescription)") } } }
辅助函数在这里
// combine exif dictionaries func addGPSToEXIF(old:NSDictionary, new:NSDictionary) -> NSDictionary { old.setValue(new, forKey: kCGImagePropertyGPSDictionary as String) return old } // get an NSDictionary from an image func getEXIFFromImage(image:NSData) -> NSDictionary { let imageSourceRef = CGImageSourceCreateWithData(image, nil); let currentProperties = CGImageSourceCopyPropertiesAtIndex(imageSourceRef!, 0, nil) let mutableDict = NSMutableDictionary(dictionary: currentProperties!) return mutableDict } // Attach EXIF DIctionary data to an image func attachEXIFtoImage(image:NSData, EXIF:NSDictionary) -> NSData { let imageDataProvider:CGDataProviderRef = CGDataProviderCreateWithCFData(image)! let imageRef:CGImageRef = CGImageCreateWithJPEGDataProvider(imageDataProvider, nil, true, .RenderingIntentDefault)! let newImageData:CFMutableDataRef = CFDataCreateMutable(nil, 0) let type = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, "image/jpg" as CFString, kUTTypeImage) let destination:CGImageDestinationRef = CGImageDestinationCreateWithData(newImageData, (type?.takeRetainedValue())!, 1, nil)! CGImageDestinationAddImage(destination, imageRef, EXIF as CFDictionaryRef) CGImageDestinationFinalize(destination) return newImageData as NSData } // save file within app with EXIF func saveFile(image: NSData) { // Saves the file out let dataPath = Genba.sharedInstance.userdata_save_folder let fileExists = dataPath.checkResourceIsReachableAndReturnError(nil) if fileExists { let formatter = NSDateFormatter() formatter.dateFormat = "YM-dd_HH-mm-ss" let time = formatter.stringFromDate(NSDate()) let savefilepath = dataPath.URLByAppendingPathComponent(time+".jpg") let result = image.writeToURL(savefilepath, atomically: false) if result { savePhotoToLibraryWithURL(savefilepath) } else { debugPrint(n,#line,"failed to save") } } } // resize image from NSData func resizeNSDataImage (inputImage:NSData, newSize:CGSize) -> NSData { var smallerImage:NSData? = nil let image = UIImage(data: inputImage) UIGraphicsBeginImageContext(newSize) image!.drawInRect(CGRect(origin: CGPointZero, size: newSize)) let newImage = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() smallerImage = UIImageJPEGRepresentation(newImage, 1) return smallerImage! }
func savePhotoToLibraryWithURL（image：NSURL）{
let photoLibrary = PHPhotoLibrary.sharedPhotoLibrary() photoLibrary.performChanges({ PHAssetChangeRequest.creationRequestForAssetFromImageAtFileURL(image) }) { (success: Bool, error: NSError?) -> Void in if success { } else { print(self.n,#line,"Error writing to photo library: \(error!.localizedDescription)") } } }
通过ALAssetsLibrary保存图像：
let imgDataProvider = CGDataProviderCreateWithCFData(imageData); let imageRef = CGImageCreateWithJPEGDataProvider(imgDataProvider, nil, true, .RenderingIntentDefault) let library = ALAssetsLibrary() library.writeImageToSavedPhotosAlbum(imageRef, metadata:mutableDictionary as [NSObject : AnyObject], completionBlock:nil)