Xmp.php

Go to the documentation of this file.

<?php

namespace GetId3\Module\Tag;

//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
// See readme.txt for more details                             //
//                                                             //
// module.tag.xmp.php                                          //
// module for analyzing XMP metadata (e.g. in JPEG files)      //
// dependencies: NONE                                          //
//                                                             //
//                                                             //
// Module originally written [2009-Mar-26] by                  //
//      Nigel Barnes <ngbarnesØhotmail*com>                    //
// Bundled into GetId3 with permission                         //
//   called by GetId3 in module.graphic.jpg.php                //
//                                                            ///

/**************************************************************************************************
 * SWISScenter Source                                                              Nigel Barnes
 *
 *      Provides functions for reading information from the 'APP1' Extensible Metadata
 *      Platform (XMP) segment of JPEG format files.
 *      This XMP segment is XML based and contains the Resource Description Framework (RDF)
 *      data, which itself can contain the Dublin Core Metadata Initiative (DCMI) information.
 *
 *      This code uses segments from the JPEG Metadata Toolkit project by Evan Hunter.
 *************************************************************************************************/

class Xmp
{
    public $_sFilename = null;

    public $_aXMP = array();

    public $_bXMPParse = false;

    protected static $XMP_tag_captions = array(
    // IPTC Core
        'Iptc4xmpCore:CiAdrCity',
        'Iptc4xmpCore:CiAdrCtry',
        'Iptc4xmpCore:CiAdrExtadr',
        'Iptc4xmpCore:CiAdrPcode',
        'Iptc4xmpCore:CiAdrRegion',
        'Iptc4xmpCore:CiEmailWork',
        'Iptc4xmpCore:CiTelWork',
        'Iptc4xmpCore:CiUrlWork',
        'Iptc4xmpCore:CountryCode',
        'Iptc4xmpCore:CreatorContactInfo',
        'Iptc4xmpCore:IntellectualGenre',
        'Iptc4xmpCore:Location',
        'Iptc4xmpCore:Scene',
        'Iptc4xmpCore:SubjectCode',
    // Dublin Core Schema
        'dc:contributor',
        'dc:coverage',
        'dc:creator',
        'dc:date',
        'dc:description',
        'dc:format',
        'dc:identifier',
        'dc:language',
        'dc:publisher',
        'dc:relation',
        'dc:rights',
        'dc:source',
        'dc:subject',
        'dc:title',
        'dc:type',
    // XMP Basic Schema
        'xmp:Advisory',
        'xmp:BaseURL',
        'xmp:CreateDate',
        'xmp:CreatorTool',
        'xmp:Identifier',
        'xmp:Label',
        'xmp:MetadataDate',
        'xmp:ModifyDate',
        'xmp:Nickname',
        'xmp:Rating',
        'xmp:Thumbnails',
        'xmpidq:Scheme',
    // XMP Rights Management Schema
        'xmpRights:Certificate',
        'xmpRights:Marked',
        'xmpRights:Owner',
        'xmpRights:UsageTerms',
        'xmpRights:WebStatement',
    // These are not in spec but Photoshop CS seems to use them
        'xap:Advisory',
        'xap:BaseURL',
        'xap:CreateDate',
        'xap:CreatorTool',
        'xap:Identifier',
        'xap:MetadataDate',
        'xap:ModifyDate',
        'xap:Nickname',
        'xap:Rating',
        'xap:Thumbnails',
        'xapidq:Scheme',
        'xapRights:Certificate',
        'xapRights:Copyright',
        'xapRights:Marked',
        'xapRights:Owner',
        'xapRights:UsageTerms',
        'xapRights:WebStatement',
    // XMP Media Management Schema
        'xapMM:DerivedFrom',
        'xapMM:DocumentID',
        'xapMM:History',
        'xapMM:InstanceID',
        'xapMM:ManagedFrom',
        'xapMM:Manager',
        'xapMM:ManageTo',
        'xapMM:ManageUI',
        'xapMM:ManagerVariant',
        'xapMM:RenditionClass',
        'xapMM:RenditionParams',
        'xapMM:VersionID',
        'xapMM:Versions',
        'xapMM:LastURL',
        'xapMM:RenditionOf',
        'xapMM:SaveID',
    // XMP Basic Job Ticket Schema
        'xapBJ:JobRef',
    // XMP Paged-Text Schema
        'xmpTPg:MaxPageSize',
        'xmpTPg:NPages',
        'xmpTPg:Fonts',
        'xmpTPg:Colorants',
        'xmpTPg:PlateNames',
    // Adobe PDF Schema
        'pdf:Keywords',
        'pdf:PDFVersion',
        'pdf:Producer',
    // Photoshop Schema
        'photoshop:AuthorsPosition',
        'photoshop:CaptionWriter',
        'photoshop:Category',
        'photoshop:City',
        'photoshop:Country',
        'photoshop:Credit',
        'photoshop:DateCreated',
        'photoshop:Headline',
        'photoshop:History',
    // Not in XMP spec
        'photoshop:Instructions',
        'photoshop:Source',
        'photoshop:State',
        'photoshop:SupplementalCategories',
        'photoshop:TransmissionReference',
        'photoshop:Urgency',
    // EXIF Schemas
        'tiff:ImageWidth',
        'tiff:ImageLength',
        'tiff:BitsPerSample',
        'tiff:Compression',
        'tiff:PhotometricInterpretation',
        'tiff:Orientation',
        'tiff:SamplesPerPixel',
        'tiff:PlanarConfiguration',
        'tiff:YCbCrSubSampling',
        'tiff:YCbCrPositioning',
        'tiff:XResolution',
        'tiff:YResolution',
        'tiff:ResolutionUnit',
        'tiff:TransferFunction',
        'tiff:WhitePoint',
        'tiff:PrimaryChromaticities',
        'tiff:YCbCrCoefficients',
        'tiff:ReferenceBlackWhite',
        'tiff:DateTime',
        'tiff:ImageDescription',
        'tiff:Make',
        'tiff:Model',
        'tiff:Software',
        'tiff:Artist',
        'tiff:Copyright',
        'exif:ExifVersion',
        'exif:FlashpixVersion',
        'exif:ColorSpace',
        'exif:ComponentsConfiguration',
        'exif:CompressedBitsPerPixel',
        'exif:PixelXDimension',
        'exif:PixelYDimension',
        'exif:MakerNote',
        'exif:UserComment',
        'exif:RelatedSoundFile',
        'exif:DateTimeOriginal',
        'exif:DateTimeDigitized',
        'exif:ExposureTime',
        'exif:FNumber',
        'exif:ExposureProgram',
        'exif:SpectralSensitivity',
        'exif:ISOSpeedRatings',
        'exif:OECF',
        'exif:ShutterSpeedValue',
        'exif:ApertureValue',
        'exif:BrightnessValue',
        'exif:ExposureBiasValue',
        'exif:MaxApertureValue',
        'exif:SubjectDistance',
        'exif:MeteringMode',
        'exif:LightSource',
        'exif:Flash',
        'exif:FocalLength',
        'exif:SubjectArea',
        'exif:FlashEnergy',
        'exif:SpatialFrequencyResponse',
        'exif:FocalPlaneXResolution',
        'exif:FocalPlaneYResolution',
        'exif:FocalPlaneResolutionUnit',
        'exif:SubjectLocation',
        'exif:SensingMethod',
        'exif:FileSource',
        'exif:SceneType',
        'exif:CFAPattern',
        'exif:CustomRendered',
        'exif:ExposureMode',
        'exif:WhiteBalance',
        'exif:DigitalZoomRatio',
        'exif:FocalLengthIn35mmFilm',
        'exif:SceneCaptureType',
        'exif:GainControl',
        'exif:Contrast',
        'exif:Saturation',
        'exif:Sharpness',
        'exif:DeviceSettingDescription',
        'exif:SubjectDistanceRange',
        'exif:ImageUniqueID',
        'exif:GPSVersionID',
        'exif:GPSLatitude',
        'exif:GPSLongitude',
        'exif:GPSAltitudeRef',
        'exif:GPSAltitude',
        'exif:GPSTimeStamp',
        'exif:GPSSatellites',
        'exif:GPSStatus',
        'exif:GPSMeasureMode',
        'exif:GPSDOP',
        'exif:GPSSpeedRef',
        'exif:GPSSpeed',
        'exif:GPSTrackRef',
        'exif:GPSTrack',
        'exif:GPSImgDirectionRef',
        'exif:GPSImgDirection',
        'exif:GPSMapDatum',
        'exif:GPSDestLatitude',
        'exif:GPSDestLongitude',
        'exif:GPSDestBearingRef',
        'exif:GPSDestBearing',
        'exif:GPSDestDistanceRef',
        'exif:GPSDestDistance',
        'exif:GPSProcessingMethod',
        'exif:GPSAreaInformation',
        'exif:GPSDifferential',
        'stDim:w',
        'stDim:h',
        'stDim:unit',
        'xapGImg:height',
        'xapGImg:width',
        'xapGImg:format',
        'xapGImg:image',
        'stEvt:action',
        'stEvt:instanceID',
        'stEvt:parameters',
        'stEvt:softwareAgent',
        'stEvt:when',
        'stRef:instanceID',
        'stRef:documentID',
        'stRef:versionID',
        'stRef:renditionClass',
        'stRef:renditionParams',
        'stRef:manager',
        'stRef:managerVariant',
        'stRef:manageTo',
        'stRef:manageUI',
        'stVer:comments',
        'stVer:event',
        'stVer:modifyDate',
        'stVer:modifier',
        'stVer:version',
        'stJob:name',
        'stJob:id',
        'stJob:url',
    // Exif Flash
        'exif:Fired',
        'exif:Return',
        'exif:Mode',
        'exif:Function',
        'exif:RedEyeMode',
    // Exif OECF/SFR
        'exif:Columns',
        'exif:Rows',
        'exif:Names',
        'exif:Values',
    // Exif CFAPattern
        'exif:Columns',
        'exif:Rows',
        'exif:Values',
    // Exif DeviceSettings
        'exif:Columns',
        'exif:Rows',
        'exif:Settings',
    );

    protected static $JPEG_Segment_Names = array(
        0x01 => 'TEM',
        0x02 => 'RES',
        0xC0 => 'SOF0',
        0xC1 => 'SOF1',
        0xC2 => 'SOF2',
        0xC3 => 'SOF4',
        0xC4 => 'DHT',
        0xC5 => 'SOF5',
        0xC6 => 'SOF6',
        0xC7 => 'SOF7',
        0xC8 => 'JPG',
        0xC9 => 'SOF9',
        0xCA => 'SOF10',
        0xCB => 'SOF11',
        0xCC => 'DAC',
        0xCD => 'SOF13',
        0xCE => 'SOF14',
        0xCF => 'SOF15',
        0xD0 => 'RST0',
        0xD1 => 'RST1',
        0xD2 => 'RST2',
        0xD3 => 'RST3',
        0xD4 => 'RST4',
        0xD5 => 'RST5',
        0xD6 => 'RST6',
        0xD7 => 'RST7',
        0xD8 => 'SOI',
        0xD9 => 'EOI',
        0xDA => 'SOS',
        0xDB => 'DQT',
        0xDC => 'DNL',
        0xDD => 'DRI',
        0xDE => 'DHP',
        0xDF => 'EXP',
        0xE0 => 'APP0',
        0xE1 => 'APP1',
        0xE2 => 'APP2',
        0xE3 => 'APP3',
        0xE4 => 'APP4',
        0xE5 => 'APP5',
        0xE6 => 'APP6',
        0xE7 => 'APP7',
        0xE8 => 'APP8',
        0xE9 => 'APP9',
        0xEA => 'APP10',
        0xEB => 'APP11',
        0xEC => 'APP12',
        0xED => 'APP13',
        0xEE => 'APP14',
        0xEF => 'APP15',
        0xF0 => 'JPG0',
        0xF1 => 'JPG1',
        0xF2 => 'JPG2',
        0xF3 => 'JPG3',
        0xF4 => 'JPG4',
        0xF5 => 'JPG5',
        0xF6 => 'JPG6',
        0xF7 => 'JPG7',
        0xF8 => 'JPG8',
        0xF9 => 'JPG9',
        0xFA => 'JPG10',
        0xFB => 'JPG11',
        0xFC => 'JPG12',
        0xFD => 'JPG13',
        0xFE => 'COM',
    );

    public function isValid()
    {
        return $this->_bXMPParse;
    }

    public function getAllTags()
    {
        return $this->_aXMP;
    }

    public function _get_jpeg_header_data($filename)
    {
        // prevent refresh from aborting file operations and hosing file
        ignore_user_abort(true);

        // Attempt to open the jpeg file - the at symbol supresses the error message about
        // not being able to open files. The file_exists would have been used, but it
        // does not work with files fetched over http or ftp.
        if (is_readable($filename) && is_file($filename) && ($filehnd = fopen($filename, 'rb'))) {
            // great
        } else {
            return false;
        }

        // Read the first two characters
        $data = fread($filehnd, 2);

        // Check that the first two characters are 0xFF 0xD8  (SOI - Start of image)
        if ($data != "\xFF\xD8") {
            // No SOI (FF D8) at start of file - This probably isn't a JPEG file - close file and return;
            echo '<p>This probably is not a JPEG file</p>'."\n";
            fclose($filehnd);

            return false;
        }

        // Read the third character
        $data = fread($filehnd, 2);

        // Check that the third character is 0xFF (Start of first segment header)
        if ($data{0} != "\xFF") {
            // NO FF found - close file and return - JPEG is probably corrupted
            fclose($filehnd);

            return false;
        }

        // Flag that we havent yet hit the compressed image data
        $hit_compressed_image_data = false;

        // Cycle through the file until, one of: 1) an EOI (End of image) marker is hit,
        //                                       2) we have hit the compressed image data (no more headers are allowed after data)
        //                                       3) or end of file is hit

        while (($data{1} != "\xD9") && (!$hit_compressed_image_data) && (!feof($filehnd))) {
            // Found a segment to look at.
            // Check that the segment marker is not a Restart marker - restart markers don't have size or data after them
            if ((ord($data{1}) < 0xD0) || (ord($data{1}) > 0xD7)) {
                // Segment isn't a Restart marker
                // Read the next two bytes (size)
                $sizestr = fread($filehnd, 2);

                // convert the size bytes to an integer
                $decodedsize = unpack('nsize', $sizestr);

                // Save the start position of the data
                $segdatastart = ftell($filehnd);

                // Read the segment data with length indicated by the previously read size
                $segdata = fread($filehnd, $decodedsize['size'] - 2);

                // Store the segment information in the output array
                $headerdata[] = array(
                    'SegType'      => ord($data{1}),
                    'SegName'      => self::$JPEG_Segment_Names[ord($data{1})],
                    'SegDataStart' => $segdatastart,
                    'SegData'      => $segdata,
                );
            }

            // If this is a SOS (Start Of Scan) segment, then there is no more header data - the compressed image data follows
            if ($data{1} == "\xDA") {
                // Flag that we have hit the compressed image data - exit loop as no more headers available.
                $hit_compressed_image_data = true;
            } else {
                // Not an SOS - Read the next two bytes - should be the segment marker for the next segment
                $data = fread($filehnd, 2);

                // Check that the first byte of the two is 0xFF as it should be for a marker
                if ($data{0} != "\xFF") {
                    // NO FF found - close file and return - JPEG is probably corrupted
                    fclose($filehnd);

                    return false;
                }
            }
        }

        // Close File
        fclose($filehnd);
        // Alow the user to abort from now on
        ignore_user_abort(false);

        // Return the header data retrieved
        return $headerdata;
    }

    public function _get_XMP_text($filename)
    {
        //Get JPEG header data
        $jpeg_header_data = $this->_get_jpeg_header_data($filename);

        //Cycle through the header segments
        for ($i = 0; $i < count($jpeg_header_data); $i++) {
            // If we find an APP1 header,
            if (strcmp($jpeg_header_data[$i]['SegName'], 'APP1') == 0) {
                // And if it has the Adobe XMP/RDF label (http://ns.adobe.com/xap/1.0/\x00) ,
                if (strncmp($jpeg_header_data[$i]['SegData'], 'http://ns.adobe.com/xap/1.0/'."\x00", 29) == 0) {
                    // Found a XMP/RDF block
                    // Return the XMP text
                    $xmp_data = substr($jpeg_header_data[$i]['SegData'], 29);

                    return trim($xmp_data); // trim() should not be neccesary, but some files found in the wild with null-terminated block (known samples from Apple Aperture) causes problems elsewhere (see http://www.getid3.org/phpBB3/viewtopic.php?f=4&t=1153)
                }
            }
        }

        return false;
    }

    public function read_XMP_array_from_text($xmltext)
    {
        // Check if there actually is any text to parse
        if (trim($xmltext) == '') {
            return false;
        }

        // Create an instance of a xml parser to parse the XML text
        $xml_parser = xml_parser_create('UTF-8');

        // Change: Fixed problem that caused the whitespace (especially newlines) to be destroyed when converting xml text to an xml array, as of revision 1.10

        // We would like to remove unneccessary white space, but this will also
        // remove things like newlines (&#xA;) in the XML values, so white space
        // will have to be removed later
        if (xml_parser_set_option($xml_parser, XML_OPTION_SKIP_WHITE, 0) == false) {
            // Error setting case folding - destroy the parser and return
            xml_parser_free($xml_parser);

            return false;
        }

        // to use XML code correctly we have to turn case folding
        // (uppercasing) off. XML is case sensitive and upper
        // casing is in reality XML standards violation
        if (xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, 0) == false) {
            // Error setting case folding - destroy the parser and return
            xml_parser_free($xml_parser);

            return false;
        }

        // Parse the XML text into a array structure
        if (xml_parse_into_struct($xml_parser, $xmltext, $values, $tags) == 0) {
            // Error Parsing XML - destroy the parser and return
            xml_parser_free($xml_parser);

            return false;
        }

        // Destroy the xml parser
        xml_parser_free($xml_parser);

        // Clear the output array
        $xmp_array = array();

        // The XMP data has now been parsed into an array ...

        // Cycle through each of the array elements
        $current_property = ''; // current property being processed
        $container_index = -1; // -1 = no container open, otherwise index of container content
        foreach ($values as $xml_elem) {
            // Syntax and Class names
            switch ($xml_elem['tag']) {
                case 'x:xmpmeta':
                    // only defined attribute is x:xmptk written by Adobe XMP Toolkit; value is the version of the toolkit
                    break;

                case 'rdf:RDF':
                    // required element immediately within x:xmpmeta; no data here
                    break;

                case 'rdf:Description':
                    switch ($xml_elem['type']) {
                        case 'open':
                        case 'complete':
                            if (array_key_exists('attributes', $xml_elem)) {
                                // rdf:Description may contain wanted attributes
                                foreach (array_keys($xml_elem['attributes']) as $key) {
                                    // Check whether we want this details from this attribute
                                    if (in_array($key, self::$XMP_tag_captions)) {
                                        // Attribute wanted
                                        $xmp_array[$key] = $xml_elem['attributes'][$key];
                                    }
                                }
                            }
                        case 'cdata':
                        case 'close':
                            break;
                    }

                case 'rdf:ID':
                case 'rdf:nodeID':
                    // Attributes are ignored
                    break;

                case 'rdf:li':
                    // Property member
                    if ($xml_elem['type'] == 'complete') {
                        if (array_key_exists('attributes', $xml_elem)) {
                            // If Lang Alt (language alternatives) then ensure we take the default language
                            if (isset($xml_elem['attributes']['xml:lang']) && ($xml_elem['attributes']['xml:lang'] != 'x-default')) {
                                break;
                            }
                        }
                        if ($current_property != '') {
                            $xmp_array[$current_property][$container_index] = (isset($xml_elem['value']) ? $xml_elem['value'] : '');
                            $container_index += 1;
                        }
                    //else unidentified attribute!!
                    }
                    break;

                case 'rdf:Seq':
                case 'rdf:Bag':
                case 'rdf:Alt':
                    // Container found
                    switch ($xml_elem['type']) {
                        case 'open':
                             $container_index = 0;
                             break;
                        case 'close':
                            $container_index = -1;
                            break;
                        case 'cdata':
                            break;
                    }
                    break;

                default:
                    // Check whether we want the details from this attribute
                    if (in_array($xml_elem['tag'], self::$XMP_tag_captions)) {
                        switch ($xml_elem['type']) {
                            case 'open':
                                // open current element
                                $current_property = $xml_elem['tag'];
                                break;

                            case 'close':
                                // close current element
                                $current_property = '';
                                break;

                            case 'complete':
                                // store attribute value
                                $xmp_array[$xml_elem['tag']] = (isset($xml_elem['value']) ? $xml_elem['value'] : '');
                                break;

                            case 'cdata':
                                // ignore
                                break;
                        }
                    }
                    break;
            }

        }

        return $xmp_array;
    }

    public function Image_XMP($sFilename)
    {
        $this->_sFilename = $sFilename;

        if (is_file($this->_sFilename)) {
            // Get XMP data
            $xmp_data = $this->_get_XMP_text($sFilename);
            if ($xmp_data) {
                $this->_aXMP = $this->read_XMP_array_from_text($xmp_data);
                $this->_bXMPParse = true;
            }
        }
    }
}