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<?php
/**
* @package Sven.Bluege
* @subpackage com_eventgallery
*
* @copyright Copyright (C) 2005 - 2019 Sven Bluege All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Svenbluege\Component\Eventgallery\Site\Library\Data;
defined('_JEXEC') or die;
use ImageInfo\ImageInfo;
use lsolesen\pel\PelJpeg;
use lsolesen\pel\PelIfd;
use lsolesen\pel\Pel;
use lsolesen\pel\PelTag;
class Exif
{
public $model = null;
public $focallength = null;
public $focallength35mm = null;
public $fstop = null;
public $exposuretime = null;
public $iso = null;
public $creation_date = null;
public $has90DegreeRotation = false;
public $orientation = null;
public function __construct($jsonStringData = null) {
if (isset($jsonStringData)) {
$data = json_decode($jsonStringData);
if (json_last_error() == JSON_ERROR_NONE) {
$this->model = isset($data->model)?$data->model : null;
$this->focallength = isset($data->focallength)?$data->focallength : null;
$this->focallength35mm = isset($data->focallength35mm)?$data->focallength35mm : null;
$this->fstop = isset($data->fstop)?$data->fstop : null;
$this->exposuretime = isset($data->exposuretime)?$data->exposuretime : null;
$this->iso = isset($data->iso)?$data->iso : null;
$this->creation_date = isset($data->creation_date)?$data->creation_date : null;
}
}
}
public function toJson() {
return json_encode($this);
}
/**
* @param $filename string Path to the file which contains the data
* @param $autorotate boolean defines if we autorotate the image to get width/height correctly
* @return Exif
*/
public static function extract($filename) {
$exif = new self();
$ext = pathinfo($filename, PATHINFO_EXTENSION);
if ($ext == 'webp') {
try {
$imageInfo = new ImageInfo($filename);
$exifData = $imageInfo->getEXIFData();
if (!empty($exifData)) {
$exif->model = $exifData->get('Model') ?? null;
$exif->orientation = $exifData->getRaw('Orientation') ?? null;
if ($exifData->has('FocalLength')) {
$exif->focallength = sprintf('%.01f', self::exif_get_float($exifData->get('FocalLength')));
}
if ($exifData->has('FocalLengthIn35mmFilm')) {
$exif->focallength = sprintf('%.01f', self::exif_get_float($exifData->get('FocalLengthIn35mmFilm')));
}
$exif->fstop = $exifData->get('FNumber') ?? null;
$exif->exposuretime = $exifData->get('ExposureTime') ?? null;
$exif->iso = $exifData->get('ISOSpeedRatings') ?? null;
$exif->creation_date = $exifData->get('DateTimeOriginal') ? $exifData->get('DateTimeOriginal')->format('YmdHis') : null;
}
}
catch (\Exception $e) {
// do nothing
}
} elseif (function_exists('exif_read_data')) {
$exifData = @exif_read_data($filename, 0, true);
if (isset($exifData["IFD0"])) {
if (isset($exifData["IFD0"]["Model"])) {
$exif->model = $exifData["IFD0"]["Model"];
}
if (isset($exifData['IFD0']['Orientation'])) {
$exif->orientation = $exifData['IFD0']['Orientation'];
}
}
if (isset($exifData["EXIF"])) {
if (isset($exifData["EXIF"]["ExposureTime"])) {
$exif->exposuretime = self::exif_format_exposure($exifData["EXIF"]["ExposureTime"]);
}
if(isset($exifData["EXIF"]["ISOSpeedRatings"])) {
$data = $exifData["EXIF"]["ISOSpeedRatings"];
if (is_array($data)) {
$exif->iso = $exifData["EXIF"]["ISOSpeedRatings"][0];
} else {
$exif->iso = $exifData["EXIF"]["ISOSpeedRatings"];
}
}
if (isset($exifData["EXIF"]["FocalLength"])) {
$focal_length = $exifData["EXIF"]["FocalLength"];
$exif->focallength = sprintf('%.01f', self::exif_get_float($focal_length));
}
if (isset($exifData["EXIF"]["FocalLengthIn35mmFilm"])) {
$focal_length = $exifData["EXIF"]["FocalLengthIn35mmFilm"];
$exif->focallength35mm = sprintf('%.01f', self::exif_get_float($focal_length));
}
if (isset($exifData["EXIF"]["DateTimeOriginal"])) {
$creation_date = $exifData["EXIF"]["DateTimeOriginal"];
if (!empty($creation_date)) {
$creation_date = str_replace(':', '', $creation_date);
$creation_date = str_replace(' ', '', $creation_date);
$exif->creation_date = $creation_date;
}
}
}
if (isset($exifData["COMPUTED"]["ApertureFNumber"])) {
$exif->fstop = str_replace('f/','', $exifData["COMPUTED"]["ApertureFNumber"]);
}
}
if ($exif->orientation == 6 || $exif->orientation == 8) {
$exif->has90DegreeRotation = true;
}
return $exif;
}
private static function exif_get_float($value) {
$pos = strpos($value, '/');
if ($pos === false) return (float) $value;
$a = (float) substr($value, 0, $pos);
$b = (float) substr($value, $pos+1);
return ($b == 0) ? ($a) : ($a / $b);
}
private static function exif_format_exposure($value) {
$v = explode('/', $value);
try {
if (count($v) == 2) {
if ($v[0] / $v[1] < 1) {
return Pel::fmt('1/%d', $v[1] / $v[0]);
} else {
return Pel::fmt('%d', $v[0] / $v[1]);
}
}
} catch (\DivisionByZeroError $e) {
$value = 0;
}
return $value;
}
/**
* Converts a float into a fraction if the float is smaller than 1.
*
* @param $n
* @param $tolerance
* @return mixed|string
*/
static function float2rat($n, $tolerance = 1.e-4) {
$n = (float)$n;
if ($n>=1 || $n<=0) {
return $n;
}
$h1=1; $h2=0;
$k1=0; $k2=1;
$b = 1/$n;
do {
$b = 1/$b;
$a = floor($b);
$aux = $h1; $h1 = $a*$h1+$h2; $h2 = $aux;
$aux = $k1; $k1 = $a*$k1+$k2; $k2 = $aux;
$b = $b-$a;
} while (abs($n-$h1/$k1) > $n*$tolerance);
return "$h1/$k1";
}
}