115 lines
3.8 KiB
Go
115 lines
3.8 KiB
Go
package meta
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import (
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"math"
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"time"
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)
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// Data represents image meta data.
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type Data struct {
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DocumentID string `meta:"ImageUniqueID,OriginalDocumentID,DocumentID"`
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InstanceID string `meta:"InstanceID,DocumentID"`
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TakenAt time.Time `meta:"DateTimeOriginal,CreateDate,MediaCreateDate,DateTimeDigitized,DateTime"`
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TakenAtLocal time.Time `meta:"DateTimeOriginal,CreateDate,MediaCreateDate,DateTimeDigitized,DateTime"`
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TimeZone string `meta:"-"`
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Duration time.Duration `meta:"Duration,MediaDuration,TrackDuration"`
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Codec string `meta:"CompressorID,Compression,FileType"`
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Title string `meta:"Title"`
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Subject string `meta:"Subject,PersonInImage,ObjectName"`
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Keywords string `meta:"Keywords"`
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Comment string `meta:"-"`
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Artist string `meta:"Artist,Creator"`
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Description string `meta:"Description"`
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Copyright string `meta:"Rights,Copyright"`
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Projection string `meta:"ProjectionType"`
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CameraMake string `meta:"CameraMake,Make"`
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CameraModel string `meta:"CameraModel,Model"`
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CameraOwner string `meta:"OwnerName"`
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CameraSerial string `meta:"SerialNumber"`
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LensMake string `meta:"LensMake"`
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LensModel string `meta:"Lens,LensModel"`
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Flash bool `meta:"-"`
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FocalLength int `meta:"-"`
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Exposure string `meta:"ExposureTime"`
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Aperture float32 `meta:"ApertureValue"`
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FNumber float32 `meta:"FNumber"`
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Iso int `meta:"ISO"`
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GPSPosition string `meta:"GPSPosition"`
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GPSLatitude string `meta:"GPSLatitude"`
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GPSLongitude string `meta:"GPSLongitude"`
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Lat float32 `meta:"-"`
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Lng float32 `meta:"-"`
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Altitude int `meta:"GlobalAltitude"`
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Width int `meta:"PixelXDimension,ImageWidth,ExifImageWidth,SourceImageWidth"`
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Height int `meta:"PixelYDimension,ImageHeight,ImageLength,ExifImageHeight,SourceImageHeight"`
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Orientation int `meta:"-"`
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Rotation int `meta:"Rotation"`
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Views int `meta:"-"`
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Albums []string `meta:"-"`
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Error error `meta:"-"`
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All map[string]string
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}
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// NewData creates a new metadata struct.
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func NewData() Data {
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return Data{
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All: make(map[string]string),
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}
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}
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// AspectRatio returns the aspect ratio based on width and height.
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func (data Data) AspectRatio() float32 {
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width := float64(data.ActualWidth())
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height := float64(data.ActualHeight())
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if width <= 0 || height <= 0 {
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return 0
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}
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aspectRatio := float32(width / height)
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return aspectRatio
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}
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// Portrait returns true if it's a portrait picture or video based on width and height.
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func (data Data) Portrait() bool {
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return data.Width < data.Height
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}
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// Megapixels returns the resolution in megapixels.
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func (data Data) Megapixels() int {
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return int(math.Round(float64(data.Width*data.Height) / 1000000))
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}
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// HasDocumentID returns true if a DocumentID exists.
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func (data Data) HasDocumentID() bool {
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return len(data.DocumentID) >= 15
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}
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// HasInstanceID returns true if an InstanceID exists.
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func (data Data) HasInstanceID() bool {
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return len(data.InstanceID) >= 15
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}
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// HasTimeAndPlace if data contains a time and gps position.
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func (data Data) HasTimeAndPlace() bool {
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return !data.TakenAt.IsZero() && data.Lat != 0 && data.Lng != 0
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}
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// ActualWidth is the width after rotating the media file if needed.
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func (data Data) ActualWidth() int {
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if data.Orientation > 4 {
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return data.Height
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}
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return data.Width
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}
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// ActualHeight is the height after rotating the media file if needed.
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func (data Data) ActualHeight() int {
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if data.Orientation > 4 {
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return data.Width
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}
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return data.Height
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}
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