evanoberholster / goexif2

Decode embedded EXIF meta data from image files written in Pure Golang

goexif2

Provides decoding of basic exif and tiff encoded data. This project is a fork of rwcarlsen/goexif with many PR and patches integrated. Suggestions and pull requests are welcome.

Installation

To install the exif extraction cli tool, in a terminal type:

go install github.com/xor-gate/goexif2/cmd/goexif2
goexif2 <file>.jpg

Functionality is split into two packages - "exif" and "tiff" The exif package depends on the tiff package.

go get github.com/xor-gate/goexif2/exif
go get github.com/xor-gate/goexif2/tiff

Example

package main

import (
	"fmt"
	"log"
	"os"

	"github.com/xor-gate/goexif2/exif"
	"github.com/xor-gate/goexif2/mknote"
)

func ExampleDecode() {
	fname := "sample1.jpg"

	f, err := os.Open(fname)
	if err != nil {
		log.Fatal(err)
	}

	// Optionally register camera makenote data parsing - currently Nikon and
	// Canon are supported.
	exif.RegisterParsers(mknote.All...)

	x, err := exif.Decode(f)
	if err != nil {
		log.Fatal(err)
	}

	camModel, _ := x.Get(exif.Model) // normally, don't ignore errors!
	fmt.Println(camModel.StringVal())

	focal, _ := x.Get(exif.FocalLength)
	numer, denom, _ := focal.Rat2(0) // retrieve first (only) rat. value
	fmt.Printf("%v/%v", numer, denom)

	// Two convenience functions exist for date/time taken and GPS coords:
	tm, _ := x.DateTime()
	fmt.Println("Taken: ", tm)

	lat, long, _ := x.LatLong()
	fmt.Println("lat, long: ", lat, ", ", long)
}

License

2-Clause BSD