Как сохранить пользовательские метаданные в изображении, когда я получаю изображение, используя AVFoundation framework?
Я знаю, что могу получить доступ к свойствам, если у меня есть мое изображение как UIImage или CIImageно свойства, которые у них, похоже, отличаются друг от друга (даже если это одно и то же изображение).
До сих пор я получаю доступ к словарю так: (Код взят из блога Caffeinated Cocoa)
NSLog(@"about to request a capture from: %@", [self stillImageOutput]);
[[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error)
{
NSData *jpeg = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer] ;
CGImageSourceRef source = CGImageSourceCreateWithData((__bridge_retained CFDataRef)jpeg, NULL);
//get all the metadata in the image
NSDictionary *metadata = (__bridge NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source,0,NULL);
//make the metadata dictionary mutable so we can add properties to it
NSMutableDictionary *metadataAsMutable = [metadata mutableCopy];
NSMutableDictionary *EXIFDictionary = [[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary]mutableCopy];
NSMutableDictionary *GPSDictionary = [[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyGPSDictionary]mutableCopy];
NSMutableDictionary *RAWDictionary = [[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyRawDictionary]mutableCopy];
if(!EXIFDictionary) {
EXIFDictionary = [NSMutableDictionary dictionary];
}
if(!GPSDictionary) {
GPSDictionary = [NSMutableDictionary dictionary];
}
if(!RAWDictionary) {
RAWDictionary = [NSMutableDictionary dictionary];
}
float _lat = gpsInfo.coordinate.latitude;
float _lon = gpsInfo.coordinate.longitude;
float _alt = gpsInfo.altitude;
NSDate *_date = gpsInfo.timestamp;
float _heading = gpsInfo.course;;
[GPSDictionary setValue:[NSNumber numberWithFloat:_lat]
forKey:(NSString*)kCGImagePropertyGPSLatitude];
[GPSDictionary setValue:[NSNumber numberWithFloat:_lon]
forKey:(NSString*)kCGImagePropertyGPSLongitude];
[GPSDictionary setValue:[NSNumber numberWithFloat:_alt]
forKey:(NSString*)kCGImagePropertyGPSAltitude];
[GPSDictionary setValue:_date
forKey:(NSString*)kCGImagePropertyGPSDateStamp];
[GPSDictionary setValue:[NSNumber numberWithFloat:_heading]
forKey:(NSString*)kCGImagePropertyGPSImgDirection];
[EXIFDictionary setValue:@"Wasup" forKey:(NSString *)kCGImagePropertyExifUserComment];
[RAWDictionary setValue:attitude forKey:@"Attitude"];
//Add the modified Data back into the image’s metadata
[metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary];
[metadataAsMutable setObject:GPSDictionary forKey:(NSString *)kCGImagePropertyGPSDictionary];
[metadataAsMutable setObject:RAWDictionary forKey:(NSString *)kCGImagePropertyRawDictionary];
NSLog(@"Info: %@",metadataAsMutable);
CFStringRef UTI = CGImageSourceGetType(source); //this is the type of image (e.g., public.jpeg)
//this will be the data CGImageDestinationRef will write into
NSMutableData *data = [NSMutableData data];
CGImageDestinationRef destination = CGImageDestinationCreateWithData((__bridge CFMutableDataRef)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, (__bridge 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 ***");
}
И я могу сохранить свое изображение следующим образом:
CIImage *testImage = [CIImage imageWithData:data];
NSDictionary *propDict = [testImage properties];
NSLog(@"Properties %@",propDict);
Или вот так
UIImage *imageMod = [[UIImage alloc] initWithData:data];
CGImageSourceRef source2 = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
//get all the metadata in the image
NSDictionary *metadata2 = (__bridge NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source2,0,NULL);
NSLog(@"WASD: %@",metadata2);
Однако ни один из параметров не возвращает мой словарь пользовательских необработанных данных.
Таким образом, я хочу сохранить свой собственный объект в поле, созданном мной (в данном случае объект cmattitude)
PD: когда я NSLOG словарь, прежде чем объединить его с изображениему него есть все файлы, как я хочу.
Info: {
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 6;
PixelHeight = 1080;
PixelWidth = 1920;
"{Exif}" = {
ApertureValue = "2.526069";
BrightnessValue = "4.013361";
ColorSpace = 1;
ComponentsConfiguration = (
1,
2,
3,
0
);
ExifVersion = (
2,
2,
1
);
ExposureMode = 0;
ExposureProgram = 2;
ExposureTime = "0.03333334";
FNumber = "2.4";
Flash = 16;
FlashPixVersion = (
1,
0
);
FocalLenIn35mmFilm = 35;
FocalLength = "4.28";
ISOSpeedRatings = (
80
);
MeteringMode = 5;
PixelXDimension = 1920;
PixelYDimension = 1080;
SceneCaptureType = 0;
SensingMethod = 2;
Sharpness = 0;
ShutterSpeedValue = "4.906905";
SubjectArea = (
959,
539,
518,
388
);
UserComment = "Wazup";
WhiteBalance = 0;
};
"{GPS}" = {
Altitude = 102;
DateStamp = "2012-01-20 06:55:48 +0000";
ImgDirection = "-1";
Latitude = "35.02496";
Longitude = "135.754";
};
"{Raw}" = {
Attitude = "Pitch: 50.913760, Roll: 36.342350, Yaw: -164.272361 @ 0.048291\n";
};
"{TIFF}" = {
Orientation = 6;
ResolutionUnit = 2;
XResolution = 72;
YResolution = 72;
"_YCbCrPositioning" = 1;
};
Но когда я NSLOG словарь из нового изображения, он дает мне это для CIIMage:
Properties {
ColorModel = RGB;
DPIHeight = 72;
DPIWidth = 72;
Depth = 8;
Orientation = 6;
PixelHeight = 1080;
PixelWidth = 1920;
"{Exif}" = {
ApertureValue = "2.526069";
BrightnessValue = "4.013361";
ColorSpace = 1;
ComponentsConfiguration = (
0,
0,
0,
1
);
ExifVersion = (
2,
2,
1
);
ExposureMode = 0;
ExposureProgram = 2;
ExposureTime = "0.03333334";
FNumber = "2.4";
Flash = 16;
FlashPixVersion = (
1,
0
);
FocalLenIn35mmFilm = 35;
FocalLength = "4.28";
ISOSpeedRatings = (
80
);
MeteringMode = 5;
PixelXDimension = 1920;
PixelYDimension = 1080;
SceneCaptureType = 0;
SensingMethod = 2;
Sharpness = 0;
ShutterSpeedValue = "4.906905";
SubjectArea = (
959,
539,
518,
388
);
UserComment = "Wazup";
WhiteBalance = 0;
};
"{GPS}" = {
Altitude = 102;
ImgDirection = 0;
Latitude = "35.025";
Longitude = "135.754";
};
"{JFIF}" = {
DensityUnit = 1;
JFIFVersion = (
1,
1
);
XDensity = 72;
YDensity = 72;
};
"{TIFF}" = {
Orientation = 6;
ResolutionUnit = 2;
XResolution = 72;
YResolution = 72;
"_YCbCrPositioning" = 1;
};
И если яNSLog UIImage это дает мне еще меньше информации.
Спасибо!