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|
package fileop
import (
"math"
"time"
"github.com/barasher/go-exiftool"
"git.sr.ht/~gabrielgio/img/pkg/components/media"
)
func ReadExif(path string) (*media.MediaEXIF, error) {
et, err := exiftool.NewExiftool()
if err != nil {
return nil, err
}
defer et.Close()
newExif := &media.MediaEXIF{}
fileInfo := et.ExtractMetadata(path)[0]
// Get description
description, err := fileInfo.GetString("ImageDescription")
if err == nil {
newExif.Description = &description
}
// Get camera model
model, err := fileInfo.GetString("Model")
if err == nil {
newExif.Camera = &model
}
// Get Camera make
make, err := fileInfo.GetString("Make")
if err == nil {
newExif.Maker = &make
}
// Get Image Size
width, err := fileInfo.GetFloat("ImageWidth")
if err == nil {
newExif.Width = &width
}
height, err := fileInfo.GetFloat("ImageHeight")
if err == nil {
newExif.Height = &height
}
// Get lens
lens, err := fileInfo.GetString("LensModel")
if err == nil {
newExif.Lens = &lens
}
//Get time of photo
createDateKeys := []string{
"CreationDate",
"DateTimeOriginal",
"CreateDate",
"TrackCreateDate",
"MediaCreateDate",
"FileCreateDate",
"ModifyDate",
"TrackModifyDate",
"MediaModifyDate",
"FileModifyDate",
}
for _, createDateKey := range createDateKeys {
date, err := fileInfo.GetString(createDateKey)
if err == nil {
layout := "2006:01:02 15:04:05"
dateTime, err := time.Parse(layout, date)
if err == nil {
newExif.DateShot = &dateTime
} else {
layoutWithOffset := "2006:01:02 15:04:05+02:00"
dateTime, err = time.Parse(layoutWithOffset, date)
if err == nil {
newExif.DateShot = &dateTime
}
}
break
}
}
// Get exposure time
exposureTime, err := fileInfo.GetFloat("ExposureTime")
if err == nil {
newExif.Exposure = &exposureTime
}
// Get aperture
aperture, err := fileInfo.GetFloat("Aperture")
if err == nil {
newExif.Aperture = &aperture
}
// Get ISO
iso, err := fileInfo.GetInt("ISO")
if err == nil {
newExif.Iso = &iso
}
// Get focal length
focalLen, err := fileInfo.GetFloat("FocalLength")
if err == nil {
newExif.FocalLength = &focalLen
}
// Get flash info
flash, err := fileInfo.GetInt("Flash")
if err == nil {
newExif.Flash = &flash
}
// Get orientation
orientation, err := fileInfo.GetInt("Orientation")
if err == nil {
newExif.Orientation = &orientation
}
// Get exposure program
expProgram, err := fileInfo.GetInt("ExposureProgram")
if err == nil {
newExif.ExposureProgram = &expProgram
}
// GPS coordinates - longitude
longitudeRaw, err := fileInfo.GetFloat("GPSLongitude")
if err == nil {
newExif.GPSLongitude = &longitudeRaw
}
// GPS coordinates - latitude
latitudeRaw, err := fileInfo.GetFloat("GPSLatitude")
if err == nil {
newExif.GPSLatitude = &latitudeRaw
}
sanitizeEXIF(newExif)
return newExif, nil
}
// isFloatReal returns true when the float value represents a real number
// (different than +Inf, -Inf or NaN)
func isFloatReal(v float64) bool {
if math.IsInf(v, 1) {
return false
} else if math.IsInf(v, -1) {
return false
} else if math.IsNaN(v) {
return false
}
return true
}
// sanitizeEXIF removes any EXIF float64 field that is not a real number (+Inf,
// -Inf or Nan)
func sanitizeEXIF(exif *media.MediaEXIF) {
if exif.Exposure != nil && !isFloatReal(*exif.Exposure) {
exif.Exposure = nil
}
if exif.Aperture != nil && !isFloatReal(*exif.Aperture) {
exif.Aperture = nil
}
if exif.FocalLength != nil && !isFloatReal(*exif.FocalLength) {
exif.FocalLength = nil
}
if (exif.GPSLatitude != nil && !isFloatReal(*exif.GPSLatitude)) ||
(exif.GPSLongitude != nil && !isFloatReal(*exif.GPSLongitude)) {
exif.GPSLatitude = nil
exif.GPSLongitude = nil
}
}
|
