IOS 4.1で新しいImageIOフレームワークを使用しています。次を使用してexifメタデータを正常に取得しました。
CFDictionaryRef metadataDict = CMGetAttachment(sampleBuffer, kCGImagePropertyExifDictionary , NULL);
それを読んで、それは有効に見えます。画像を保存することはできますが、画像にexifデータが含まれることはありません。
CGImageDestinationRef myImageDest = CGImageDestinationCreateWithURL((CFURLRef) docurl, kUTTypeJPEG, 1, NULL);
// Add the image to the destination using previously saved options.
CGImageDestinationAddImage(myImageDest, iref, NULL);
//add back exif
NSDictionary *props = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:.1], kCGImageDestinationLossyCompressionQuality,
metadataDict, kCGImagePropertyExifDictionary, //the exif metadata
nil];
//kCGImagePropertyExifAuxDictionary
CGImageDestinationSetProperties(myImageDest, (CFDictionaryRef) props);
// Finalize the image destination.
bool status = CGImageDestinationFinalize(myImageDest);
次のブログ投稿は、ExifデータCaffeinated Cocoaの変更と保存に問題があるときに答えを得た場所です。これはiOSで機能します。
ExifおよびGPSデータを書き込むためのテストコードを次に示します。これは、上記のブログからのコードのコピーアンドペーストです。これを使用して、キャプチャした画像にexifデータを書き込みます。
NSData *jpeg = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer] ;
CGImageSourceRef source ;
source = CGImageSourceCreateWithData((CFDataRef)jpeg, NULL);
//get all the metadata in the image
NSDictionary *metadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source,0,NULL);
//make the metadata dictionary mutable so we can add properties to it
NSMutableDictionary *metadataAsMutable = [[metadata mutableCopy]autorelease];
[metadata release];
NSMutableDictionary *EXIFDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary]mutableCopy]autorelease];
NSMutableDictionary *GPSDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyGPSDictionary]mutableCopy]autorelease];
if(!EXIFDictionary) {
//if the image does not have an EXIF dictionary (not all images do), then create one for us to use
EXIFDictionary = [NSMutableDictionary dictionary];
}
if(!GPSDictionary) {
GPSDictionary = [NSMutableDictionary dictionary];
}
//Setup GPS dict
[GPSDictionary setValue:[NSNumber numberWithFloat:_lat] forKey:(NSString*)kCGImagePropertyGPSLatitude];
[GPSDictionary setValue:[NSNumber numberWithFloat:_lon] forKey:(NSString*)kCGImagePropertyGPSLongitude];
[GPSDictionary setValue:lat_ref forKey:(NSString*)kCGImagePropertyGPSLatitudeRef];
[GPSDictionary setValue:lon_ref forKey:(NSString*)kCGImagePropertyGPSLongitudeRef];
[GPSDictionary setValue:[NSNumber numberWithFloat:_alt] forKey:(NSString*)kCGImagePropertyGPSAltitude];
[GPSDictionary setValue:[NSNumber numberWithShort:alt_ref] forKey:(NSString*)kCGImagePropertyGPSAltitudeRef];
[GPSDictionary setValue:[NSNumber numberWithFloat:_heading] forKey:(NSString*)kCGImagePropertyGPSImgDirection];
[GPSDictionary setValue:[NSString stringWithFormat:@"%c",_headingRef] forKey:(NSString*)kCGImagePropertyGPSImgDirectionRef];
[EXIFDictionary setValue:xml forKey:(NSString *)kCGImagePropertyExifUserComment];
//add our modified EXIF data back into the image’s metadata
[metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary];
[metadataAsMutable setObject:GPSDictionary forKey:(NSString *)kCGImagePropertyGPSDictionary];
CFStringRef UTI = CGImageSourceGetType(source); //this is the type of image (e.g., public.jpeg)
//this will be the data CGImageDestinationRef will write into
NSMutableData *dest_data = [NSMutableData data];
CGImageDestinationRef destination = CGImageDestinationCreateWithData((CFMutableDataRef)dest_data,UTI,1,NULL);
if(!destination) {
NSLog(@"***Could not create image destination ***");
}
//add the image contained in the image source to the destination, overidding the old metadata with our modified metadata
CGImageDestinationAddImageFromSource(destination,source,0, (CFDictionaryRef) metadataAsMutable);
//tell the destination to write the image data and metadata into our data object.
//It will return false if something goes wrong
BOOL success = NO;
success = CGImageDestinationFinalize(destination);
if(!success) {
NSLog(@"***Could not create data from image destination ***");
}
//now we have the data ready to go, so do whatever you want with it
//here we just write it to disk at the same path we were passed
[dest_data writeToFile:file atomically:YES];
//cleanup
CFRelease(destination);
CFRelease(source);
スティーブの答えを試してみましたが、うまくいきますが、画像全体を複製しているため、大きな画像の場合は遅いと思います。
CMSetAttachmentsを使用して、CMSampleBufferにプロパティを直接設定できます。 jpegStillImageNSDataRepresentation
を呼び出す前にこれを行うだけです
CFDictionaryRef metaDict = CMCopyDictionaryOfAttachments(NULL, imageSampleBuffer, kCMAttachmentMode_ShouldPropagate);
CFMutableDictionaryRef mutable = CFDictionaryCreateMutableCopy(NULL, 0, metaDict);
NSMutableDictionary * mutableGPS = [self getGPSDictionaryForLocation:self.myLocation];
CFDictionarySetValue(mutable, kCGImagePropertyGPSDictionary, mutableGPS);
// set the dictionary back to the buffer
CMSetAttachments(imageSampleBuffer, mutable, kCMAttachmentMode_ShouldPropagate);
また、メソッドgetGPSDictionaryForLocation:は次の場所にあります。
MSMutableDictionaryカテゴリを作成して、ジオタグやその他のメタデータを画像に保存できるようにしました。こちらのブログ投稿をご覧ください。
http://blog.codecropper.com/2011/05/adding-metadata-to-ios-images-the-easy-way/
ピースには、EXIFデータのGPSメタデータディクショナリの作成が含まれます。これを行うためのCLLocationカテゴリを次に示します。
私はまだ学んでいるので、画像のデータにメタデータを追加して保存するために、スティーブとマーティの両方の答えをまとめるのに時間がかかりました。以下では、ImageIOメソッドを使用しない回答をSwift実装しました。
CMSampleBufferサンプルバッファーbuffer
、CLLocation location
、およびMortyの suggestion を使用してCMSetAttachments
を使用して画像の複製を回避する場合、以下をせよ。 CLLocationを拡張するgpsMetadata
メソッドを見つけることができます here (Swiftも)。
if let location = location {
// Get the existing metadata dictionary (if there is one)
var metaDict = CMCopyDictionaryOfAttachments(nil, buffer, kCMAttachmentMode_ShouldPropagate) as? Dictionary<String, Any> ?? [:]
// Append the GPS metadata to the existing metadata
metaDict[kCGImagePropertyGPSDictionary as String] = location.gpsMetadata()
// Save the new metadata back to the buffer without duplicating any data
CMSetAttachments(buffer, metaDict as CFDictionary, kCMAttachmentMode_ShouldPropagate)
}
// Get JPG image Data from the buffer
guard let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer) else {
// There was a problem; handle it here
}
この時点で、画像データをファイルに書き込むか、Photos APIを使用して画像をカメラロールに保存できます(PHAssetCreationRequest's addResource:with:data:options
iOS 9以降、または古いiOSバージョンの場合、imageDataを一時ファイルに書き込んでからPHAssetChangeRequest.creationRequestForAssetFromImage:atFileURL
)。 ALAssertLibraryはiOS 9では非推奨になっていることに注意してください。実装の詳細については、回答 here で提供しています。
Swift 5:
すべてのピースを作業コードにまとめるのに1週間かかりました。
これにより、GPSメタデータとともにUIImage
がJPEG一時ファイルに保存されます。
let image:UIImage = mImageView.image! // your UIImage
// create filename
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy.MM.dd-HH.mm.ss"
let now = Date()
let date_time = dateFormatter.string(from: now)
let fileName:String = "your_image_"+date_time+".jpg" // name your file the way you want
let temporaryFolder:URL = FileManager.default.temporaryDirectory
let temporaryFileURL:URL = temporaryFolder.appendingPathComponent(fileName)
// save the image to chosen path
let jpeg = image.jpegData(compressionQuality: 0.85)! // set JPG quality here (1.0 is best)
let src = CGImageSourceCreateWithData(jpeg as CFData, nil)!
let uti = CGImageSourceGetType(src)!
let cfPath = CFURLCreateWithFileSystemPath(nil, temporaryFileURL.path as CFString, CFURLPathStyle.cfurlposixPathStyle, false)
let dest = CGImageDestinationCreateWithURL(cfPath!, uti, 1, nil)
// create GPS metadata from current location
let gpsMeta = gCurrentLocation?.exifMetadata() // gCurrentLocation is your CLLocation (exifMetadata is an extension)
let tiffProperties = [
kCGImagePropertyTIFFMake as String: "Camera vendor",
kCGImagePropertyTIFFModel as String: "Camera model"
// --(insert other properties here if required)--
] as CFDictionary
let properties = [
kCGImagePropertyTIFFDictionary as String: tiffProperties,
kCGImagePropertyGPSDictionary: gpsMeta as Any
// --(insert other dictionaries here if required)--
] as CFDictionary
CGImageDestinationAddImageFromSource(dest!, src, 0, properties)
if (CGImageDestinationFinalize(dest!)) {
print("Saved image with metadata!")
} else {
print("Error saving image with metadata")
}
GPSメタデータ拡張機能は次のとおりです( https://Gist.github.com/chefren/8b50652d67c397a825619f83c8dba6d から):
import Foundation
import CoreLocation
extension CLLocation {
func exifMetadata(heading:CLHeading? = nil) -> NSMutableDictionary {
let GPSMetadata = NSMutableDictionary()
let altitudeRef = Int(self.altitude < 0.0 ? 1 : 0)
let latitudeRef = self.coordinate.latitude < 0.0 ? "S" : "N"
let longitudeRef = self.coordinate.longitude < 0.0 ? "W" : "E"
// GPS metadata
GPSMetadata[(kCGImagePropertyGPSLatitude as String)] = abs(self.coordinate.latitude)
GPSMetadata[(kCGImagePropertyGPSLongitude as String)] = abs(self.coordinate.longitude)
GPSMetadata[(kCGImagePropertyGPSLatitudeRef as String)] = latitudeRef
GPSMetadata[(kCGImagePropertyGPSLongitudeRef as String)] = longitudeRef
GPSMetadata[(kCGImagePropertyGPSAltitude as String)] = Int(abs(self.altitude))
GPSMetadata[(kCGImagePropertyGPSAltitudeRef as String)] = altitudeRef
GPSMetadata[(kCGImagePropertyGPSTimeStamp as String)] = self.timestamp.isoTime()
GPSMetadata[(kCGImagePropertyGPSDateStamp as String)] = self.timestamp.isoDate()
GPSMetadata[(kCGImagePropertyGPSVersion as String)] = "2.2.0.0"
if let heading = heading {
GPSMetadata[(kCGImagePropertyGPSImgDirection as String)] = heading.trueHeading
GPSMetadata[(kCGImagePropertyGPSImgDirectionRef as String)] = "T"
}
return GPSMetadata
}
}
extension Date {
func isoDate() -> String {
let f = DateFormatter()
f.timeZone = TimeZone(abbreviation: "UTC")
f.dateFormat = "yyyy:MM:dd"
return f.string(from: self)
}
func isoTime() -> String {
let f = DateFormatter()
f.timeZone = TimeZone(abbreviation: "UTC")
f.dateFormat = "HH:mm:ss.SSSSSS"
return f.string(from: self)
}
}
それでおしまい!
activityViewController
を使用して、一時画像を(temporaryFileURL
を使用して)フォトアルバムに保存したり、ファイルとして保存したり、他のアプリと共有したりできます。
[説明のないダウン票のため、この答えを再訪する。]
Appleはこの問題に対処する記事を更新しました(テクニカルQ&A QA1622)。古いバージョンのXcodeを使用している場合でも、多少の不幸なことに、画像データの低レベル解析なしではこれを実行できないという記事がまだあるかもしれません。
更新されたバージョンは次のとおりです。
https://developer.Apple.com/library/ios/#qa/qa1622/_index.html
そこでコードを次のように適合させました。
- (void) saveImage:(UIImage *)imageToSave withInfo:(NSDictionary *)info
{
// Get the image metadata (EXIF & TIFF)
NSMutableDictionary * imageMetadata = [[info objectForKey:UIImagePickerControllerMediaMetadata] mutableCopy];
// add (fake) GPS data
CLLocationCoordinate2D coordSF = CLLocationCoordinate2DMake(37.732711,-122.45224);
// arbitrary altitude and accuracy
double altitudeSF = 15.0;
double accuracyHorizontal = 1.0;
double accuracyVertical = 1.0;
NSDate * nowDate = [NSDate date];
// create CLLocation for image
CLLocation * loc = [[CLLocation alloc] initWithCoordinate:coordSF altitude:altitudeSF horizontalAccuracy:accuracyHorizontal verticalAccuracy:accuracyVertical timestamp:nowDate];
// this is in case we try to acquire actual location instead of faking it with the code right above
if ( loc ) {
[imageMetadata setObject:[self gpsDictionaryForLocation:loc] forKey:(NSString*)kCGImagePropertyGPSDictionary];
}
// Get the assets library
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
// create a completion block for when we process the image
ALAssetsLibraryWriteImageCompletionBlock imageWriteCompletionBlock =
^(NSURL *newURL, NSError *error) {
if (error) {
NSLog( @"Error writing image with metadata to Photo Library: %@", error );
} else {
NSLog( @"Wrote image %@ with metadata %@ to Photo Library",newURL,imageMetadata);
}
};
// Save the new image to the Camera Roll, using the completion block defined just above
[library writeImageToSavedPhotosAlbum:[imageToSave CGImage]
metadata:imageMetadata
completionBlock:imageWriteCompletionBlock];
}
そして私はこれを
imagePickerController:didFinishPickingMediaWithInfo:
これは、画像ピッカーのデリゲートメソッドです。 (保存する画像があるかどうかを確認するためのロジックを配置する場所です)
完全を期すために、GPSデータを辞書として取得するヘルパーメソッドを次に示します。
- (NSDictionary *) gpsDictionaryForLocation:(CLLocation *)location
{
CLLocationDegrees exifLatitude = location.coordinate.latitude;
CLLocationDegrees exifLongitude = location.coordinate.longitude;
NSString * latRef;
NSString * longRef;
if (exifLatitude < 0.0) {
exifLatitude = exifLatitude * -1.0f;
latRef = @"S";
} else {
latRef = @"N";
}
if (exifLongitude < 0.0) {
exifLongitude = exifLongitude * -1.0f;
longRef = @"W";
} else {
longRef = @"E";
}
NSMutableDictionary *locDict = [[NSMutableDictionary alloc] init];
// requires ImageIO
[locDict setObject:location.timestamp forKey:(NSString*)kCGImagePropertyGPSTimeStamp];
[locDict setObject:latRef forKey:(NSString*)kCGImagePropertyGPSLatitudeRef];
[locDict setObject:[NSNumber numberWithFloat:exifLatitude] forKey:(NSString *)kCGImagePropertyGPSLatitude];
[locDict setObject:longRef forKey:(NSString*)kCGImagePropertyGPSLongitudeRef];
[locDict setObject:[NSNumber numberWithFloat:exifLongitude] forKey:(NSString *)kCGImagePropertyGPSLongitude];
[locDict setObject:[NSNumber numberWithFloat:location.horizontalAccuracy] forKey:(NSString*)kCGImagePropertyGPSDOP];
[locDict setObject:[NSNumber numberWithFloat:location.altitude] forKey:(NSString*)kCGImagePropertyGPSAltitude];
return locDict;
}
このようにしてEXIFデータを設定し、必要に応じて写真を圧縮することもできます。これで問題が解決しました。
// Get your image.
NSURL *url = @"http://somewebsite.com/path/to/some/image.jpg";
UIImage *loImgPhoto = [NSData dataWithContentsOfURL:url];
// Get your metadata (includes the EXIF data).
CGImageSourceRef loImageOriginalSource = CGImageSourceCreateWithData(( CFDataRef) loDataFotoOriginal, NULL);
NSDictionary *loDicMetadata = (__bridge NSDictionary *) CGImageSourceCopyPropertiesAtIndex(loImageOriginalSource, 0, NULL);
// Set your compression quality (0.0 to 1.0).
NSMutableDictionary *loDicMutableMetadata = [loDicMetadata mutableCopy];
[loDicMutableMetadata setObject:@(lfCompressionQualityValue) forKey:(__bridge NSString *)kCGImageDestinationLossyCompressionQuality];
// Create an image destination.
NSMutableData *loNewImageDataWithExif = [NSMutableData data];
CGImageDestinationRef loImgDestination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)loNewImageDataWithExif, CGImageSourceGetType(loImageOriginalSource), 1, NULL);
// Add your image to the destination.
CGImageDestinationAddImage(loImgDestination, loImgPhoto.CGImage, (__bridge CFDictionaryRef) loDicMutableMetadata);
// Finalize the destination.
if (CGImageDestinationFinalize(loImgDestination))
{
NSLog(@"Successful image creation.");
// process the image rendering, adjustment data creation and finalize the asset edit.
//Upload photo with EXIF metadata
[self myUploadMethod:loNewImageDataWithExif];
}
else
{
NSLog(@"Error -> failed to finalize the image.");
}
CFRelease(loImageOriginalSource);
CFRelease(loImgDestination);