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exif.php
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exif.php
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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2009 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* This is the API for handling exif data.
*/
class exif_Core {
protected static $exif_keys;
static function extract($item) {
$keys = array();
// Only try to extract EXIF from photos
if ($item->is_photo() && $item->mime_type == "image/jpeg") {
$data = array();
require_once(MODPATH . "exif/lib/exif.php");
$exif_raw = read_exif_data_raw($item->file_path(), false);
if (isset($exif_raw['ValidEXIFData'])) {
foreach(self::_keys() as $field => $exifvar) {
if (isset($exif_raw[$exifvar[0]][$exifvar[1]])) {
$value = $exif_raw[$exifvar[0]][$exifvar[1]];
if (function_exists("mb_detect_encoding") && mb_detect_encoding($value) != "UTF-8") {
$value = utf8_encode($value);
}
$keys[$field] = utf8::clean($value);
if ($field == "DateTime") {
$time = strtotime($value);
if ($time > 0) {
$item->captured = $time;
}
} else if ($field == "Caption" && !$item->description) {
$item->description = $value;
}
}
}
}
$size = getimagesize($item->file_path(), $info);
if (is_array($info) && !empty($info["APP13"])) {
$iptc = iptcparse($info["APP13"]);
foreach (array("Keywords" => "2#025", "Caption" => "2#120") as $keyword => $iptc_key) {
if (!empty($iptc[$iptc_key])) {
$value = implode(" ", $iptc[$iptc_key]);
if (function_exists("mb_detect_encoding") && mb_detect_encoding($value) != "UTF-8") {
$value = utf8_encode($value);
}
$keys[$keyword] = utf8::clean($value);
if ($keyword == "Caption" && !$item->description) {
$item->description = $value;
}
}
}
}
}
$item->save();
$record = ORM::factory("exif_record")->where("item_id", $item->id)->find();
if (!$record->loaded()) {
$record->item_id = $item->id;
}
$record->data = serialize($keys);
$record->key_count = count($keys);
$record->dirty = 0;
$record->save();
}
static function get($item) {
$exif = array();
$record = ORM::factory("exif_record")
->where("item_id", $item->id)
->find();
if (!$record->loaded()) {
return array();
}
$definitions = self::_keys();
$keys = unserialize($record->data);
foreach ($keys as $key => $value) {
$exif[] = array("caption" => $definitions[$key][2], "value" => $value);
}
return $exif;
}
private static function _keys() {
if (!isset(self::$exif_keys)) {
self::$exif_keys = array(
"Make" => array("IFD0", "Make", t("Camera Maker"), ),
"Model" => array("IFD0", "Model", t("Camera Model"), ),
"Aperture" => array("SubIFD", "FNumber", t("Aperture"), ),
"ColorSpace" => array("SubIFD", "ColorSpace", t("Color Space"), ),
"ExposureBias" => array("SubIFD", "ExposureBiasValue", t("Exposure Value"), ),
"ExposureProgram" => array("SubIFD", "ExposureProgram", t("Exposure Program"), ),
"ExposureTime" => array("SubIFD", "ExposureTime", t("Exposure Time"), ),
"Flash" => array("SubIFD", "Flash", t("Flash"), ),
"FocalLength" => array("SubIFD", "FocalLength", t("Focal Length"), ),
"ISO" => array("SubIFD", "ISOSpeedRatings", t("ISO"), ),
"MeteringMode" => array("SubIFD", "MeteringMode", t("Metering Mode"), ),
"DateTime" => array("SubIFD", "DateTimeOriginal", t("Date/Time"), ),
"Copyright" => array("IFD0", "Copyright", t("Copyright"), ),
"ImageType" => array("IFD0", "ImageType", t("Image Type"), ),
"Orientation" => array("IFD0", "Orientation", t("Orientation"), ),
"ResolutionUnit" => array("IFD0", "ResolutionUnit", t("Resolution Unit"), ),
"xResolution" => array("IFD0", "xResolution", t("X Resolution"), ),
"yResolution" => array("IFD0", "yResolution", t("Y Resolution"), ),
"Compression" => array("IFD1", "Compression", t("Compression"), ),
"BrightnessValue" => array("SubIFD", "BrightnessValue", t("Brightness Value"), ),
"Contrast" => array("SubIFD", "Contrast", t("Contrast"), ),
"ExposureMode" => array("SubIFD", "ExposureMode", t("Exposure Mode"), ),
"FlashEnergy" => array("SubIFD", "FlashEnergy", t("Flash Energy"), ),
"Saturation" => array("SubIFD", "Saturation", t("Saturation"), ),
"SceneType" => array("SubIFD", "SceneType", t("Scene Type"), ),
"Sharpness" => array("SubIFD", "Sharpness", t("Sharpness"), ),
"SubjectDistance" => array("SubIFD", "SubjectDistance", t("Subject Distance"), ),
"Caption" => array("IPTC", "Caption", t("Caption"), ),
"Keywords" => array("IPTC", "Keywords", t("Keywords"), )
);
}
return self::$exif_keys;
}
static function stats() {
$missing_exif = Database::instance()
->select("items.id")
->from("items")
->join("exif_records", "items.id", "exif_records.item_id", "left")
->where("type", "photo")
->open_paren()
->where("exif_records.item_id", null)
->orwhere("exif_records.dirty", 1)
->close_paren()
->get()
->count();
$total_items = ORM::factory("item")->where("type", "photo")->count_all();
if (!$total_items) {
return array(0, 0, 0);
}
return array($missing_exif, $total_items,
round(100 * (($total_items - $missing_exif) / $total_items)));
}
static function check_index() {
list ($remaining) = exif::stats();
if ($remaining) {
site_status::warning(
t('Your Exif index needs to be updated. <a href="%url" class="g-dialog-link">Fix this now</a>',
array("url" => html::mark_clean(url::site("admin/maintenance/start/exif_task::update_index?csrf=__CSRF__")))),
"exif_index_out_of_date");
}
}
}