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api.go
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api.go
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package api
import (
"errors"
"fmt"
"strings"
"github.com/evanoberholster/exiftools/exiftool/tags/ifd"
"github.com/evanoberholster/exiftools/exiftool/tags/ifdexif"
)
// API Errors
var (
ErrEmptyTag = errors.New("Error empty tag")
ErrParseTag = fmt.Errorf("Error parsing tag")
ErrTagType = errors.New("Error wrong tag Type")
)
// Artist convenience func. "IFD" Artist
func (res ExifResults) Artist() (artist string, err error) {
return res.GetTag(ifd.IfdRoot, 0, ifd.Artist).GetString(res.exifReader)
}
// Copyright convenience func. "IFD" Copyright
func (res ExifResults) Copyright() (copyright string, err error) {
return res.GetTag(ifd.IfdRoot, 0, ifd.Copyright).GetString(res.exifReader)
}
// CameraMake convenience func. "IFD" Make
func (res ExifResults) CameraMake() (make string, err error) {
return res.GetTag(ifd.IfdRoot, 0, ifd.Make).GetString(res.exifReader)
}
// LensMake convenience func. "IFD/Exif" LensMake
func (res ExifResults) LensMake() (make string, err error) {
return res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.LensMake).GetString(res.exifReader)
}
// CameraModel convenience func. "IFD" Model
func (res ExifResults) CameraModel() (model string, err error) {
return res.GetTag(ifd.IfdRoot, 0, ifd.Model).GetString(res.exifReader)
}
// LensModel convenience func. "IFD/Exif" LensModel
func (res ExifResults) LensModel() (model string, err error) {
return res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.LensModel).GetString(res.exifReader)
}
// CameraSerial convenience func. "IFD/Exif" BodySerialNumber
func (res ExifResults) CameraSerial() (serial string, err error) {
// BodySerialNumber
if serial, err = res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.BodySerialNumber).GetString(res.exifReader); err == nil && serial != "" {
return
}
// CameraSerialNumber
return res.GetTag(ifd.IfdRoot, 0, ifd.CameraSerialNumber).GetString(res.exifReader)
}
// LensSerial convenience func. "IFD/Exif" LensSerialNumber
func (res ExifResults) LensSerial() (serial string, err error) {
return res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.LensSerialNumber).GetString(res.exifReader)
}
// Dimensions convenience func. "IFD" Dimensions
func (res ExifResults) Dimensions() (width, height int, err error) {
width, err = res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.PixelXDimension).GetInt(res.exifReader)
if err == nil {
height, err = res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.PixelYDimension).GetInt(res.exifReader)
if err == nil {
return width, height, err
}
}
width, err = res.GetTag(ifd.IfdRoot, 0, ifd.ImageWidth).GetInt(res.exifReader)
if err == nil {
height, err = res.GetTag(ifd.IfdRoot, 0, ifd.ImageLength).GetInt(res.exifReader)
if err == nil {
return width, height, err
}
}
return 0, 0, ErrEmptyTag
}
// ExposureProgram convenience func. "IFD/Exif" ExposureProgram
func (res ExifResults) ExposureProgram() (ExposureMode, error) {
ep, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.ExposureProgram).GetInt(res.exifReader)
return ExposureMode(ep), err
}
// MeteringMode convenience func. "IFD/Exif" MeteringMode
func (res ExifResults) MeteringMode() (MeteringMode, error) {
mm, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.MeteringMode).GetInt(res.exifReader)
return MeteringMode(mm), err
}
// ShutterSpeed convenience func. "IFD/Exif" ExposureTime
func (res ExifResults) ShutterSpeed() (ShutterSpeed, error) {
// ShutterSpeedValue
// ExposureTime
num, denom, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.ExposureTime).GetRational(res.exifReader)
return ShutterSpeed{num, denom}, err
}
// Aperture convenience func. "IFD/Exif" FNumber
func (res ExifResults) Aperture() (float32, error) {
// ApertureValue
// FNumber
if num, denom, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.FNumber).GetRational(res.exifReader); err == nil {
if f := float32(num) / float32(denom); f > 0.0 {
return f, nil
}
}
return 0.0, ErrParseTag
}
// FocalLength convenience func. "IFD/Exif" FocalLength
// Lens Focal Length in mm
func (res ExifResults) FocalLength() (FocalLength, error) {
// FocalLength
if num, denom, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.FocalLength).GetRational(res.exifReader); err == nil {
if f := float32(num) / float32(denom); f > 0.0 {
return FocalLength(float32(num) / float32(denom)), nil
}
}
return 0.0, ErrEmptyTag
}
// FocalLengthIn35mmFilm convenience func. "IFD/Exif" FocalLengthIn35mmFilm
// Lens Focal Length Equivalent for 35mm sensor in mm
func (res ExifResults) FocalLengthIn35mmFilm() (FocalLength, error) {
// FocalLengthIn35mmFilm
if fn, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.FocalLengthIn35mmFilm).GetInt(res.exifReader); err == nil {
if fn > 0.0 {
return FocalLength(fn), nil
}
}
return 0.0, ErrEmptyTag
}
// ISOSpeed convenience func. "IFD/Exif" ISOSpeed
func (res ExifResults) ISOSpeed() (int, error) {
iso, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.ISOSpeedRatings).GetInt(res.exifReader)
return iso, err
}
// Flash convenience func. "IFD/Exif" Flash
func (res ExifResults) Flash() (FlashMode, error) {
f, err := res.GetTag(ifdexif.FqIfdExif, 0, ifdexif.Flash).GetInt(res.exifReader)
return FlashMode(f), err
}
// Orientation convenience func. "IFD" Orientation
// WIP
func (res ExifResults) Orientation() (string, error) {
// Orientation
return "", nil
}
// ExposureBiasValue convenience func. "IFD/Exif" ExposureBiasValue
// WIP
func (res ExifResults) ExposureBiasValue() (string, error) {
return "", nil
}
// XMLPacket convenience func. "IFD" XMLPacket
// WIP
func (res ExifResults) XMLPacket() (str string, err error) {
defer func() {
if state := recover(); state != nil {
err = state.(error)
}
}()
str, err = res.GetTag(ifd.IfdRoot, 0, ifd.XMLPacket).GetString(res.exifReader)
if err != nil {
return
}
str = strings.Replace(str, "\n", "", -1)
return strings.Replace(str, " ", "", -1), nil
}
// Thumbnail convenience func. "IFD0" StripOffsets and StripByteCounts
// WIP
// Errors with NEF images
func (res ExifResults) Thumbnail() (int, int, error) {
// CR2 file IFDO
offset, err := res.GetTag(ifd.IfdRoot, 0, ifd.StripOffsets).GetInt(res.exifReader)
if err != nil {
return 0, 0, err
}
size, err := res.GetTag(ifd.IfdRoot, 0, ifd.StripByteCounts).GetInt(res.exifReader)
if err != nil {
return 0, 0, err
}
return offset, size, nil
}