README
¶
photo-metadata
Documentation
¶
Index ¶
- func ExtractApp1Segments(rd io.Reader) ([][]byte, error)
- func ExtractApp1SegmentsWithLog(rd io.Reader, l *log.Entry) ([][]byte, error)
- func ProcessApp1Segment(reader io.Reader, dataLen int, metadata *Metadata, l *log.Entry) error
- type ExifData
- type ExifTag
- type Metadata
- type Rational
- type Urational
- type XmpData
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func ExtractApp1Segments ¶
ExtractApp1Segments returns all APP1 segments found in the provided reader data
func ExtractApp1SegmentsWithLog ¶
ExtractApp1SegmentsWithLog returns all APP1 segments found in the provided reader data and uses the provided logger
Types ¶
type ExifData ¶
type ExifData map[ExifTag]interface{}
ExifData is a map of extracted Exif data This must be binary-compatible with tiff.Metadata
type ExifTag ¶
type ExifTag uint16
ExifTag is the type for all Exif tags
const ( ExifTagImageWidth ExifTag = 0x100 ExifTagImageLength ExifTag = 0x101 ExifTagBitsPerSample ExifTag = 0x102 ExifTagCompression ExifTag = 0x103 ExifTagPhotometricInterpretation ExifTag = 0x106 ExifTagOrientation ExifTag = 0x112 ExifTagSamplesPerPixel ExifTag = 0x115 ExifTagPlanarConfiguration ExifTag = 0x11C ExifTagYCbCrSubSampling ExifTag = 0x212 ExifTagYCbCrPositioning ExifTag = 0x213 ExifTagXResolution ExifTag = 0x11A ExifTagYResolution ExifTag = 0x11B ExifTagResolutionUnit ExifTag = 0x128 ExifTagStripOffsets ExifTag = 0x111 ExifTagRowsPerStrip ExifTag = 0x116 ExifTagStripByteCounts ExifTag = 0x117 ExifTagJPEGInterchangeFormat ExifTag = 0x201 ExifTagJPEGInterchangeFormatLength ExifTag = 0x202 ExifTagTransferFunction ExifTag = 0x12D ExifTagWhitePoint ExifTag = 0x13E ExifTagPrimaryChromaticities ExifTag = 0x13F ExifTagYCbCrCoefficients ExifTag = 0x211 ExifTagReferenceBlackWhite ExifTag = 0x214 ExifTagDateTime ExifTag = 0x132 ExifTagImageDescription ExifTag = 0x10E ExifTagMake ExifTag = 0x10F ExifTagModel ExifTag = 0x110 ExifTagSoftware ExifTag = 0x131 ExifTagArtist ExifTag = 0x13B ExifTagCopyright ExifTag = 0x8298 ExifTagExifOffset ExifTag = 0x8769 ExifTagGpsOffset ExifTag = 0x8825 ExifTagInteroperabilityOffset ExifTag = 0xA005 // Exif IFD ExifTagExifVersion ExifTag = 0x9000 ExifTagFlashpixVersion ExifTag = 0xA000 ExifTagColorSpace ExifTag = 0xA001 ExifTagComponentsConfiguration ExifTag = 0x9101 ExifTagCompressedBitsPerPixel ExifTag = 0x9102 ExifTagPixelXDimension ExifTag = 0xA002 ExifTagPixelYDimension ExifTag = 0xA003 ExifTagMakerNote ExifTag = 0x927C ExifTagUserComment ExifTag = 0x9286 ExifTagRelatedSoundFile ExifTag = 0xA004 ExifTagDateTimeOriginal ExifTag = 0x9003 ExifTagDateTimeDigitized ExifTag = 0x9004 ExifTagSubSecTime ExifTag = 0x9290 ExifTagSubSecTimeOriginal ExifTag = 0x9291 ExifTagSubSecTimeDigitized ExifTag = 0x9292 ExifTagExposureTime ExifTag = 0x829A ExifTagFNumber ExifTag = 0x829D ExifTagExposureProgram ExifTag = 0x8822 ExifTagSpectralSensitivity ExifTag = 0x8824 ExifTagISOSpeedRatings ExifTag = 0x8827 ExifTagOECF ExifTag = 0x8828 ExifTagShutterSpeedValue ExifTag = 0x9201 ExifTagApertureValue ExifTag = 0x9202 ExifTagBrightnessValue ExifTag = 0x9203 ExifTagExposureBiasValue ExifTag = 0x9204 ExifTagMaxApertureValue ExifTag = 0x9205 ExifTagSubjectDistance ExifTag = 0x9206 ExifTagMeteringMode ExifTag = 0x9207 ExifTagLightSource ExifTag = 0x9208 ExifTagFlash ExifTag = 0x9209 ExifTagFocalLength ExifTag = 0x920A ExifTagSubjectArea ExifTag = 0x9214 ExifTagFlashEnergy ExifTag = 0xA20B ExifTagSpatialFrequencyResponse ExifTag = 0xA20C ExifTagFocalPlaneXResolution ExifTag = 0xA20E ExifTagFocalPlaneYResolution ExifTag = 0xA20F ExifTagFocalPlaneResolutionUnit ExifTag = 0xA210 ExifTagSubjectLocation ExifTag = 0xA214 ExifTagExposureIndex ExifTag = 0xA215 ExifTagSensingMethod ExifTag = 0xA217 ExifTagFileSource ExifTag = 0xA300 ExifTagSceneType ExifTag = 0xA301 ExifTagCFAPattern ExifTag = 0xA302 ExifTagCustomRendered ExifTag = 0xA401 ExifTagExposureMode ExifTag = 0xA402 ExifTagWhiteBalance ExifTag = 0xA403 ExifTagDigitalZoomRatio ExifTag = 0xA404 ExifTagFocalLengthIn35mmFilm ExifTag = 0xA405 ExifTagSceneCaptureType ExifTag = 0xA406 ExifTagGainControl ExifTag = 0xA407 ExifTagContrast ExifTag = 0xA408 ExifTagSaturation ExifTag = 0xA409 ExifTagSharpness ExifTag = 0xA40A ExifTagDeviceSettingDescription ExifTag = 0xA40B ExifTagSubjectDistanceRange ExifTag = 0xA40C ExifTagImageUniqueID ExifTag = 0xA420 // Custom (not in any standard, but derived from examples) ExifTagLensModel ExifTag = 42036 // GPS IFD ExifTagGPSVersionID ExifTag = 0x0 ExifTagGPSLatitudeRef ExifTag = 0x1 ExifTagGPSLatitude ExifTag = 0x2 ExifTagGPSLongitudeRef ExifTag = 0x3 ExifTagGPSLongitude ExifTag = 0x4 ExifTagGPSAltitudeRef ExifTag = 0x5 ExifTagGPSAltitude ExifTag = 0x6 ExifTagGPSTimeStamp ExifTag = 0x7 ExifTagGPSSatellites ExifTag = 0x8 ExifTagGPSStatus ExifTag = 0x9 ExifTagGPSMeasureMode ExifTag = 0xA ExifTagGPSDOP ExifTag = 0xB ExifTagGPSSpeedRef ExifTag = 0xC ExifTagGPSSpeed ExifTag = 0xD ExifTagGPSTrackRef ExifTag = 0xE ExifTagGPSTrack ExifTag = 0xF ExifTagGPSImgDirectionRef ExifTag = 0x10 ExifTagGPSImgDirection ExifTag = 0x11 ExifTagGPSMapDatum ExifTag = 0x12 ExifTagGPSDestLatitudeRef ExifTag = 0x13 ExifTagGPSDestLatitude ExifTag = 0x14 ExifTagGPSDestLongitudeRef ExifTag = 0x15 ExifTagGPSDestLongitude ExifTag = 0x16 ExifTagGPSDestBearingRef ExifTag = 0x17 ExifTagGPSDestBearing ExifTag = 0x18 ExifTagGPSDestDistanceRef ExifTag = 0x19 ExifTagGPSDestDistance ExifTag = 0x1A ExifTagGPSProcessingMethod ExifTag = 0x1B ExifTagGPSAreaInformation ExifTag = 0x1C ExifTagGPSDateStamp ExifTag = 0x1D ExifTagGPSDifferential ExifTag = 0x1E )
Reference: https://www.exif.org/Exif2-2.PDF
type Metadata ¶
Metadata holds all photo metadata (dimensions, Exif and XMP)
func ExtractWithLog ¶
ExtractWithLog extracts photo metadata from the given io.Reader and uses the provided logger for log messages
type Urational ¶
type Urational = tiff.IfdUrational
Urational is an unsigned rational number (used in Exif values)
type XmpData ¶
type XmpData struct {
Title string `xml:"title>Alt>li"` // RDF format allows more than one
Subjects []string `xml:"subject>Bag>li"`
Location string `xml:"Location,attr"`
Country string `xml:"Country,attr"`
State string `xml:"State,attr"`
City string `xml:"City,attr"`
UsageTerms string `xml:"UsageTerms>Alt>li"` // RDF format allows more than one
RightsWebStatement string `xml:"WebStatement,attr"`
Rating int `xml:"Rating,attr"`
}
XmpData stores data extracted from XMP data. This corresponds to the rdf:Description element.
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