* A new file with Exif functions
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Ævar Arnfjörð Bjarmason
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includes/Exif.php
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includes/Exif.php
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<?php
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if (defined('MEDIAWIKI')) {
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/**
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* @package MediaWiki
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* @subpackage Metadata
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*
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* @author Ævar Arnfjörð Bjarmason <avarab@gmail.com>
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* @copyright Copyright © 2005, Ævar Arnfjörð Bjarmason
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* @license http://www.gnu.org/copyleft/gpl.html GNU General Public License
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*
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* @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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* @bug 1555, 1947
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*/
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/**
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* @package MediaWiki
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* @subpackage Metadata
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*/
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class Exif {
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/**#@+
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* @var array
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*/
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/**
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* Exif tags grouped by category, the tagname itself is the key and the type
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* is the value, in the case of more than one possible value type they are
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* seperated by commas.
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*
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* @access private
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*/
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var $mExif;
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/**
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* A one dimentional array of all Exif tags
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*/
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var $mFlatExif;
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/**
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* A one dimentional array of all Exif tags that we'd want to save in
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* the database or present on a page.
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*/
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var $mValidExif;
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/**#@-*/
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/**
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* Constructor
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*/
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function Exif() {
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/**#@+
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* Exif tag type definition
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*/
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define('BYTE', 1); # An 8-bit unsigned integer.
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define('ASCII', 2); # An 8-bit byte containing one 7-bit ASCII code. The final byte is terminated with NULL.
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define('SHORT', 3); # A 16-bit (2-byte) unsigned integer.
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define('LONG', 4); # A 32-bit (4-byte) unsigned integer.
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define('RATIONAL', 5); # Two LONGs. The first LONG is the numerator and the second LONG expresses the denominator
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define('UNDEFINED', 7); # An 8-bit byte that can take any value depending on the field definition
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define('SLONG', 9); # A 32-bit (4-byte) signed integer (2's complement notation),
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define('SRATIONAL', 10); # Two SLONGs. The first SLONG is the numerator and the second SLONG is the denominator.
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/**#@-*/
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/**
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* Page numbers here refer to pages in the EXIF 2.2 standard
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*
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* @link http://exif.org/Exif2-2.PDF The Exif 2.2 specification
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*/
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$this->mExif = array(
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# TIFF Rev. 6.0 Attribute Information (p22)
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'tiff' => array(
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# Tags relating to image structure
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'structure' => array(
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'ImageWidth' => SHORT.','.LONG, # Image width
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'ImageLength' => SHORT.','.LONG, # Image height
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'BitsPerSample' => SHORT, # Number of bits per component
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# "When a primary image is JPEG compressed, this designation is not"
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# "necessary and is omitted." (p23)
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'Compression' => SHORT, # Compression scheme
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'PhotometricInterpretation' => SHORT, # Pixel composition #p23
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'Orientation' => SHORT, # Orientation of image #p24
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'SamplesPerPixel' => SHORT, # Number of components
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'PlanarConfiguration' => SHORT, # Image data arrangement #p24
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'YCbCrSubSampling' => SHORT, # Subsampling ratio of Y to C #p24
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'YCbCrPositioning' => SHORT, # Y and C positioning #p24-25
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'XResolution' => RATIONAL, # Image resolution in width direction
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'YResolution' => RATIONAL, # Image resolution in height direction
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'ResolutionUnit' => SHORT, # Unit of X and Y resolution #(p26)
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),
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# Tags relating to recording offset
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'offset' => array(
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'StripOffsets' => SHORT.','.LONG, # Image data location
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'RowsPerStrip' => SHORT.','.LONG, # Number of rows per strip
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'StripByteCounts' => SHORT.','.LONG, # Bytes per compressed strip
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'JPEGInterchangeFormat' => SHORT.','.LONG, # Offset to JPEG SOI
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'JPEGInterchangeFormatLength' => SHORT.','.LONG, # Bytes of JPEG data
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),
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# Tags relating to image data characteristics
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'characteristics' => array(
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'TransferFunction' => SHORT, # Transfer function
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'WhitePoint' => RATIONAL, # White point chromaticity
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'PrimaryChromaticities' => RATIONAL, # Chromaticities of primarities
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'YCbCrCoefficients' => RATIONAL, # Color space transformation matrix coefficients #p27
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'ReferenceBlackWhite' => RATIONAL # Pair of black and white reference values
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),
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# Other tags
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'other' => array(
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'DateTime' => ASCII, # File change date and time
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'ImageDescription' => ASCII, # Image title
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'Make' => ASCII, # Image input equipment manufacturer
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'Model' => ASCII, # Image input equipment model
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'Software' => ASCII, # Software used
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'Artist' => ASCII, # Person who created the image
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'Copyright' => ASCII, # Copyright holder
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),
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),
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# Exif IFD Attribute Information (p30-31)
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'exif' => array(
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# Tags relating to version
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'version' => array(
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# TODO: NOTE: Nonexistence of this field is taken to mean nonconformance
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# to the EXIF 2.1 AND 2.2 standards
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'ExifVersion' => UNDEFINED, # Exif version
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'FlashpixVersion' => UNDEFINED, # Supported Flashpix version #p32
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),
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# Tags relating to Image Data Characteristics
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'characteristics' => array(
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'ColorSpace' => SHORT, # Color space information #p32
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),
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# Tags relating to image configuration
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'configuration' => array(
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'ComponentsConfiguration' => UNDEFINED, # Meaning of each component #p33
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'CompressedBitsPerPixel' => RATIONAL, # Image compression mode
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'PixelYDimension' => SHORT.','.LONG, # Valid image width
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'PixelXDimension' => SHORT.','.LONG, # Valind image height
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),
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# Tags relating to related user information
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'user' => array(
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'MakerNote' => UNDEFINED, # Manufacturer notes
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'UserComment' => UNDEFINED, # User comments #p34
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),
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# Tags relating to related file information
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'related' => array(
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'RelatedSoundFile' => ASCII, # Related audio file
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),
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# Tags relating to date and time
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'dateandtime' => array(
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'DateTimeOriginal' => ASCII, # Date and time of original data generation #p36
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'DateTimeDigitized' => ASCII, # Date and time of original data generation
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'SubSecTime' => ASCII, # DateTime subseconds
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'SubSecTimeOriginal' => ASCII, # DateTimeOriginal subseconds
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'SubSecTimeDigitized' => ASCII, # DateTimeDigitized subseconds
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),
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# Tags relating to picture-taking conditions (p31)
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'conditions' => array(
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'ExposureTime' => RATIONAL, # Exposure time
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'FNumber' => RATIONAL, # F Number
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'ExposureProgram' => SHORT, # Exposure Program #p38
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'SpectralSensitivity' => ASCII, # Spectral sensitivity
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'ISOSpeedRatings' => SHORT, # ISO speed rating
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'OECF' => UNDEFINED, # Optoelectronic conversion factor
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'ShutterSpeedValue' => SRATIONAL, # Shutter speed
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'ApertureValue' => RATIONAL, # Aperture
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'BrightnessValue' => SRATIONAL, # Brightness
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'ExposureBiasValue' => SRATIONAL, # Exposure bias
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'MaxApertureValue' => RATIONAL, # Maximum land aperture
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'SubjectDistance' => RATIONAL, # Subject distance
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'MeteringMode' => SHORT, # Metering mode #p40
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'LightSource' => SHORT, # Light source #p40-41
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'Flash' => SHORT, # Flash #p41-42
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'FocalLength' => RATIONAL, # Lens focal length
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'SubjectArea' => SHORT, # Subject area
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'FlashEnergy' => RATIONAL, # Flash energy
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'SpatialFrequencyResponse' => UNDEFINED, # Spatial frequency response
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'FocalPlaneXResolution' => RATIONAL, # Focal plane X resolution
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'FocalPlaneYResolution' => RATIONAL, # Focal plane Y resolution
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'FocalPlaneResolutionUnit' => SHORT, # Focal plane resolution unit
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'SubjectLocation' => SHORT, # Subject location
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'ExposureIndex' => RATIONAL, # Exposure index
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'SensingMethod' => SHORT, # Sensing method #p46
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'FileSource' => UNDEFINED, # File source #p47
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'SceneType' => UNDEFINED, # Scene type #p47
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'CFAPattern' => UNDEFINED, # CFA pattern
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'CustomRendered' => SHORT, # Custom image processing #p48
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'ExposureMode' => SHORT, # Exposure mode #p48
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'WhiteBalance' => SHORT, # White Balance #p49
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'DigitalZoomRatio' => RATIONAL, # Digital zoom ration
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'FocalLengthIn35mmFilm' => SHORT, # Focal length in 35 mm film
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'SceneCaptureType' => SHORT, # Scene capture type #p49
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'GainControl' => RATIONAL, # Scene control #p49-50
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'Contrast' => SHORT, # Contrast #p50
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'Saturation' => SHORT, # Saturation #p50
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'Sharpness' => SHORT, # Sharpness #p50
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'DeviceSettingDescription' => UNDEFINED, # Desice settings description
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'SubjectDistanceRange' => SHORT, # Subject distance range #p51
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),
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'other' => array(
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'ImageUniqueID' => ASCII, # Unique image ID
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),
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),
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# GPS Attribute Information (p52)
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'gps' => array(
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'GPSVersionID' => BYTE, # GPS tag version
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'GPSLatitudeRef' => ASCII, # North or South Latitude #p52-53
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'GPSLatitude' => RATIONAL, # Latitude
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'GPSLongitudeRef' => ASCII, # East or West Longitude #p53
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'GPSLongitude' => RATIONAL, # Longitude
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'GPSAltitudeRef' => BYTE, # Altitude reference
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'GPSAltitude' => RATIONAL, # Altitude
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'GPSTimeStamp' => RATIONAL, # GPS time (atomic clock)
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'GPSSatellites' => ASCII, # Satellites used for measurement
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'GPSStatus' => ASCII, # Receiver status #p54
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'GPSMeasureMode' => ASCII, # Measurement mode #p54-55
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'GPSDOP' => RATIONAL, # Measurement precision
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'GPSSpeedRef' => ASCII, # Speed unit #p55
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'GPSSpeed' => RATIONAL, # Speed of GPS receiver
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'GPSTrackRef' => ASCII, # Reference for direction of movement #p55
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'GPSTrack' => RATIONAL, # Direction of movement
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'GPSImgDirectionRef' => ASCII, # Reference for direction of image #p56
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'GPSImgDirection' => RATIONAL, # Direction of image
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'GPSMapDatum' => ASCII, # Geodetic survey data used
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'GPSDestLatitudeRef' => ASCII, # Reference for latitude of destination #p56
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'GPSDestLatitude' => RATIONAL, # Latitude destination
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'GPSDestLongitudeRef' => ASCII, # Reference for longitude of destination #p57
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'GPSDestLongitude' => RATIONAL, # Longitude of destination
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'GPSDestBearingRef' => ASCII, # Reference for bearing of destination #p57
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'GPSDestBearing' => RATIONAL, # Bearing of destination
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'GPSDestDistanceRef' => ASCII, # Reference for distance to destination #p57-58
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'GPSDestDistance' => RATIONAL, # Distance to destination
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'GPSProcessingMethod' => UNDEFINED, # Name of GPS processing method
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'GPSAreaInformation' => UNDEFINED, # Name of GPS area
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'GPSDateStamp' => ASCII, # GPS date
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'GPSDifferential' => SHORT, # GPS differential correction
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),
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);
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$this->makeFlatExifTags();
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$this->makeValidExifTags();
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}
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/**
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* Get the raw list of exiftags
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*
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* @access private
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* @return array
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*/
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function getExif() {
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return $this->mExif;
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}
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/**
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* Generate a flat list of the exif tags
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*/
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function makeFlatExifTags() {
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$exif = $this->getExif();
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array_walk($exif, array(&$this, 'callback')); // note the reference
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}
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/**
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* A callback function used by makeFlatExifTags()
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*/
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function callback($val, $key) {
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if (gettype($val) === 'array')
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array_walk($val, array(&$this, 'callback'));
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else
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$this->mFlatExif[$key] = $val;
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}
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/**
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* Produce a list of all Exif tags appropriate for user output
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*
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* Produce a list of all tags that we want to show in output, in order not to
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* output binary gibberish such as raw thumbnails we strip all tags
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* with the datatype of UNDEFINED.
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*
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* @todo We might actually want to display some of the UNDEFINED
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* stuff, but we strip it for now.
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*/
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function makeValidExifTags() {
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foreach($this->mFlatExif as $key => $val) {
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if (strpos( $val, (string)UNDEFINED ) !== false)
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continue;
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$this->mValidExif[] = $key;
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}
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}
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/**
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* The version of the output format
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*
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* Before the actual metadata information is saved in the database we
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* strip some of it since we don't want to save things like thumbnails
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* which usually accompany Exif data. This value gets saved in the
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* database along with the actual Exif data, and if the version in the
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* database doesn't equal the value returned by this function the Exif
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* data is regenerated.
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*
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* @return int
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*/
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function version() {
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return 1; // We don't need no bloddy constants!
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}
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}
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} // MEDIAWIKI
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