Documentation
¶
Overview ¶
Package heicexif marries HEIC-parsing to EXIF-parsing and equips go-exif- knife for HEIC support.
Index ¶
- Constants
- Variables
- type HeicExifContext
- type HeicExifMediaParser
- func (hemp *HeicExifMediaParser) LooksLikeFormat(data []byte) bool
- func (hemp *HeicExifMediaParser) Parse(rs io.ReadSeeker, size int) (mc riimage.MediaContext, err error)
- func (hemp *HeicExifMediaParser) ParseBytes(data []byte) (mc riimage.MediaContext, err error)
- func (hemp *HeicExifMediaParser) ParseFile(filepath string) (mc riimage.MediaContext, err error)
Examples ¶
Constants ¶
View Source
const ( // MinimumHeicStreamLengthForDetection describes the minimum amount of data // required to detect HEIC content. MinimumHeicStreamLengthForDetection = 1000 // HeicMimeType describes the theoretical, official HEIC mime-type // (theoretical because it's not ubiquitously supported/known in tooling, // yet). HeicMimeType = "image/heif" )
Variables ¶
View Source
var ( // HeicBrands is the list of MP4 brands that are associated with HEIC // streams. HeicBrands = sort.StringSlice{ "mif1", "msf1", "heic", } )
Functions ¶
This section is empty.
Types ¶
type HeicExifContext ¶
type HeicExifContext []byte
HeicExifContext is just a simple type-alias for a byte-array.
func (HeicExifContext) Exif ¶
func (hec HeicExifContext) Exif() (rootIfd *exif.Ifd, data []byte, err error)
Exif parses the raw EXIF data and returns the root IFD.
type HeicExifMediaParser ¶
type HeicExifMediaParser struct {
}
HeicExifMediaParser satisfies the `riimage.MediaParser` interface.
func NewHeicExifMediaParser ¶
func NewHeicExifMediaParser() *HeicExifMediaParser
NewHeicExifMediaParser returns a new HeicExifMediaParser instance.
func (*HeicExifMediaParser) LooksLikeFormat ¶
func (hemp *HeicExifMediaParser) LooksLikeFormat(data []byte) bool
LooksLikeFormat parses the data to determine if it's a compatible format.
Example ¶
filepath := path.Join(assetsPath, testImageRelFilepathWithExif)
f, err := os.Open(filepath)
log.PanicIf(err)
defer f.Close()
data := make([]byte, MinimumHeicStreamLengthForDetection)
_, err = io.ReadFull(f, data)
log.PanicIf(err)
hemp := new(HeicExifMediaParser)
doesLookLike := hemp.LooksLikeFormat(data)
fmt.Printf("%v\n", doesLookLike)
Output: true
func (*HeicExifMediaParser) Parse ¶
func (hemp *HeicExifMediaParser) Parse(rs io.ReadSeeker, size int) (mc riimage.MediaContext, err error)
Parse parses a stream using an `io.ReadSeeker`.
Example ¶
filepath := path.Join(assetsPath, testImageRelFilepathWithExif) f, err := os.Open(filepath) log.PanicIf(err) defer f.Close() hemp := new(HeicExifMediaParser) mc, err := hemp.Parse(f, 0) log.PanicIf(err) rootIfd, _, err := mc.Exif() log.PanicIf(err) fmt.Println(rootIfd)
Output: Ifd<ID=(0) IFD-PATH=[IFD] INDEX=(0) COUNT=(4) OFF=(0x0008) CHILDREN=(0) PARENT=(0x0000) NEXT-IFD=(0x0000)>
func (*HeicExifMediaParser) ParseBytes ¶
func (hemp *HeicExifMediaParser) ParseBytes(data []byte) (mc riimage.MediaContext, err error)
ParseBytes parses a stream direct from bytes.
Example ¶
filepath := path.Join(assetsPath, testImageRelFilepathWithExif) b, err := ioutil.ReadFile(filepath) log.PanicIf(err) hemp := new(HeicExifMediaParser) mc, err := hemp.ParseBytes(b) log.PanicIf(err) rootIfd, _, err := mc.Exif() log.PanicIf(err) fmt.Println(rootIfd)
Output: Ifd<ID=(0) IFD-PATH=[IFD] INDEX=(0) COUNT=(4) OFF=(0x0008) CHILDREN=(0) PARENT=(0x0000) NEXT-IFD=(0x0000)>
func (*HeicExifMediaParser) ParseFile ¶
func (hemp *HeicExifMediaParser) ParseFile(filepath string) (mc riimage.MediaContext, err error)
ParseFile parses a stream using a file.
Example ¶
filepath := path.Join(assetsPath, testImageRelFilepathWithExif) hemp := new(HeicExifMediaParser) mc, err := hemp.ParseFile(filepath) log.PanicIf(err) rootIfd, _, err := mc.Exif() log.PanicIf(err) fmt.Println(rootIfd)
Output: Ifd<ID=(0) IFD-PATH=[IFD] INDEX=(0) COUNT=(4) OFF=(0x0008) CHILDREN=(0) PARENT=(0x0000) NEXT-IFD=(0x0000)>
Source Files
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