NSMutableDictionary+ImageMetadata.m
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//
// NSMutableDictionary+ImageMetadata.m
// RCTCamera
//
// Created by Jehan Tremback on 7/10/15.
//
//
#import <Foundation/Foundation.h>
#import <ImageIO/ImageIO.h>
@interface NSMutableDictionary(ImageMetadata)
- (void)mergeMetadata:(NSDictionary *)inputMetadata;
@end
@implementation NSMutableDictionary(ImageMetadata)
- (void)mergeMetadata:(NSDictionary *)inputMetadata {
NSDictionary *inputMetadataLocation = [inputMetadata objectForKey:@"location"];
if (inputMetadataLocation) {
// Add GPS stuff
[self setObject:[self getGPSDictionaryForLocation:inputMetadataLocation] forKey:(NSString *)kCGImagePropertyGPSDictionary];
}
}
- (NSMutableDictionary *)getGPSDictionaryForLocation:(NSDictionary *)location {
NSMutableDictionary *gps = [NSMutableDictionary dictionary];
NSDictionary *coords = [location objectForKey:@"coords"];
// GPS tag version
[gps setObject:@"2.2.0.0" forKey:(NSString *)kCGImagePropertyGPSVersion];
// Timestamp
double timestamp = floor([[location objectForKey:@"timestamp"] doubleValue]);
NSDate *date = [NSDate dateWithTimeIntervalSince1970:timestamp];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"HH:mm:ss.SSSSSS"];
[formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
[gps setObject:[formatter stringFromDate:date] forKey:(NSString *)kCGImagePropertyGPSTimeStamp];
[formatter setDateFormat:@"yyyy:MM:dd"];
[gps setObject:[formatter stringFromDate:date] forKey:(NSString *)kCGImagePropertyGPSDateStamp];
// Latitude
double latitude = [[coords objectForKey:@"latitude"] doubleValue];
if (latitude < 0) {
latitude = -latitude;
[gps setObject:@"S" forKey:(NSString *)kCGImagePropertyGPSLatitudeRef];
} else {
[gps setObject:@"N" forKey:(NSString *)kCGImagePropertyGPSLatitudeRef];
}
[gps setObject:[NSNumber numberWithFloat:latitude] forKey:(NSString *)kCGImagePropertyGPSLatitude];
// Longitude
double longitude = [[coords objectForKey:@"longitude"] doubleValue];
if (longitude < 0) {
longitude = -longitude;
[gps setObject:@"W" forKey:(NSString *)kCGImagePropertyGPSLongitudeRef];
} else {
[gps setObject:@"E" forKey:(NSString *)kCGImagePropertyGPSLongitudeRef];
}
[gps setObject:[NSNumber numberWithFloat:longitude] forKey:(NSString *)kCGImagePropertyGPSLongitude];
// Altitude
double altitude = [[coords objectForKey:@"altitude"] doubleValue];
if (!isnan(altitude)){
if (altitude < 0) {
altitude = -altitude;
[gps setObject:@"1" forKey:(NSString *)kCGImagePropertyGPSAltitudeRef];
} else {
[gps setObject:@"0" forKey:(NSString *)kCGImagePropertyGPSAltitudeRef];
}
[gps setObject:[NSNumber numberWithFloat:altitude] forKey:(NSString *)kCGImagePropertyGPSAltitude];
}
// Speed, must be converted from m/s to km/h
double speed = [[coords objectForKey:@"speed"] doubleValue];
if (speed >= 0){
[gps setObject:@"K" forKey:(NSString *)kCGImagePropertyGPSSpeedRef];
[gps setObject:[NSNumber numberWithFloat:speed*3.6] forKey:(NSString *)kCGImagePropertyGPSSpeed];
}
// Heading
double heading = [[coords objectForKey:@"heading"] doubleValue];
if (heading >= 0){
[gps setObject:@"T" forKey:(NSString *)kCGImagePropertyGPSTrackRef];
[gps setObject:[NSNumber numberWithFloat:heading] forKey:(NSString *)kCGImagePropertyGPSTrack];
}
return gps;
}
@end