Pixelpost Forum - How to read aux:Lens from xmp image info?

How to read aux:Lens from xmp image info?

My first post, I hope this thread is where it should be.

I’m trying to read lens name info from a JPG image saved from PS.

From what I can conjure up with google I’ve narrowed it down to this PHP function by Pekka Saarinen

http://photography-on-the.net/ee/bet...mp_to_exif.php

Code:

<?php



$xmp_parsed = ee_extract_exif_from_pscs_xmp ("CRW_0016b_preview.jpg",1);



function ee_extract_exif_from_pscs_xmp ($filename,$printout=0) {

    

    // very straightforward one-purpose utility function which

    // reads image data and gets some EXIF data (what I needed) out from its XMP tags (by Adobe Photoshop CS)

    // returns an array with values

    // code by Pekka Saarinen http://photography-on-the.net

    

    ob_start();

    readfile($filename);

    $source = ob_get_contents();

    ob_end_clean();

    

    $xmpdata_start = strpos($source,"<x:xmpmeta");

    $xmpdata_end = strpos($source,"</x:xmpmeta>");

    $xmplenght = $xmpdata_end-$xmpdata_start;

    $xmpdata = substr($source,$xmpdata_start,$xmplenght+12);

    

    $xmp_parsed = array();

    

    $regexps = array(

    array("name" => "DC creator", "regexp" => "/<dc:creator>\s*<rdf:Seq>\s*<rdf:li>.+<\/rdf:li>\s*<\/rdf:Seq>\s*<\/dc:creator>/"),

    array("name" => "TIFF camera model", "regexp" => "/<tiff:Model>.+<\/tiff:Model>/"),

    array("name" => "TIFF maker", "regexp" => "/<tiff:Make>.+<\/tiff:Make>/"),

    array("name" => "EXIF exposure time", "regexp" => "/<exif:ExposureTime>.+<\/exif:ExposureTime>/"),

    array("name" => "EXIF f number", "regexp" => "/<exif:FNumber>.+<\/exif:FNumber>/"),

    array("name" => "EXIF aperture value", "regexp" => "/<exif:ApertureValue>.+<\/exif:ApertureValue>/"),

    array("name" => "EXIF exposure program", "regexp" => "/<exif:ExposureProgram>.+<\/exif:ExposureProgram>/"),

    array("name" => "EXIF iso speed ratings", "regexp" => "/<exif:ISOSpeedRatings>\s*<rdf:Seq>\s*<rdf:li>.+<\/rdf:li>\s*<\/rdf:Seq>\s*<\/exif:ISOSpeedRatings>/"),

    array("name" => "EXIF datetime original", "regexp" => "/<exif:DateTimeOriginal>.+<\/exif:DateTimeOriginal>/"),

    array("name" => "EXIF exposure bias value", "regexp" => "/<exif:ExposureBiasValue>.+<\/exif:ExposureBiasValue>/"),

    array("name" => "EXIF metering mode", "regexp" => "/<exif:MeteringMode>.+<\/exif:MeteringMode>/"),

    array("name" => "EXIF focal lenght", "regexp" => "/<exif:FocalLength>.+<\/exif:FocalLength>/"),

    array("name" => "AUX lens", "regexp" => "/<aux:Lens>.+<\/aux:Lens>/")

    );

    

    foreach ($regexps as $key => $k) {

            $name         = $k["name"];

            $regexp     = $k["regexp"];

            unset($r);

            preg_match ($regexp, $xmpdata, $r);

            $xmp_item = "";

            $xmp_item = @$r[0];

            array_push($xmp_parsed,array("item" => $name, "value" => $xmp_item));

    }

    

    if ($printout == 1) {

        foreach ($xmp_parsed as $key => $k) {

                $item         = $k["item"];

                $value         = $k["value"];

                print "<br><b>" . $item . ":</b> " . $value;

        }

    }



return ($xmp_parsed);



}



?>

I’m only interested in returning the info from the last index in the array “AUX lens” where is will tell you the name of the lens used in the image ex. “EF24-70mm f/2.8L USM”

I’ve been trying to get this custom function to work in pixelpost with modding the functions _exif.php file but my lack of PHP knowledge and a decent way to debugging has stumped me, I know this method will work but someone with a handle on PHP is needed

i can be emailed at bryan AT bryan-howard DOT com