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<?php
function td_get_exif($file) {
// catch for those who don't have exif module loaded
if (!is_callable('exif_read_data'))
return;
$mime = $file->mimetype;
if ($mime != 'image/jpeg' && $mime != 'image/pjpeg')
return;
$filename = $file->getFilenameOnFilestore();
$exif = exif_read_data($filename);
create_metadata($file->getGUID(), "tp_exif", serialize($exif), "string", $file->getObjectOwnerGUID(), ACCESS_PUBLIC);
}
function tp_exif_formatted($file_guid) {
$metadata_exif = get_metadata_byname($file_guid, "tp_exif");
if (!$metadata_exif) { //try to load it from the file if its not in the database
$file = new ElggFile($file_guid);
td_get_exif($file);
unset($file);
$metadata_exif = get_metadata_byname($file_guid, "tp_exif");
}
if (!$metadata_exif) {
return false;
}
$exif = unserialize($metadata_exif["value"]);
$model = $exif['Model'];
if(!$model) $model = "N/A";
$exif_data['Model'] = $model;
$exposure = $exif['ExposureTime'];
if (!$exposure) $exposure = "N/A";
$exif_data['Shutter'] = $exposure;
//got the code snippet below from http://www.zenphoto.org/support/topic.php?id=17
//convert the raw values to understandible values
$Fnumber = explode("/", $exif['FNumber']);
if ($Fnumber[1] != 0)
$Fnumber = $Fnumber[0] / $Fnumber[1];
else
$Fnumber = 0;
if (!$Fnumber) {
$Fnumber = "N/A";
} else {
$Fnumber = "f/$Fnumber";
}
$exif_data['Aperture'] = $Fnumber;
$iso = $exif['ISOSpeedRatings'];
if (!$iso) $iso = "N/A";
$exif_data['ISO Speed'] = $iso;
$Focal = explode("/", $exif['FocalLength']);
if ($Focal[1] != 0)
$Focal = $Focal[0] / $Focal[1];
else
$Focal = 0;
if (!$Focal || round($Focal) == "0") $Focal = 0;
if (round($Focal) == 0) {
$Focal = "N/A";
} else {
$Focal = round($Focal) . "mm";
}
$exif_data['Focal Length'] = $Focal;
$captured = $exif['DateTime'];
if (!$captured) $captured = "N/A";
$exif_data['Captured'] = $captured;
return $exif_data;
}
?>
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