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<?php
/*
* This file is part of Zoph.
*
* Zoph 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.
*
* Zoph 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 Zoph; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/*
* Uses PHP's read_exif_data() function to parse EXIF headers.
*
* I've tried to match some of the normalizations/conversions done by jhead
* (some code borrowed from exif.c). (License from jhead explicitly allows this).
*
* Jason
*/
function process_exif($image) {
$exifdata = array();
$exif = read_exif_data($image);
if ($exif === false) {
echo translate("No EXIF header found.") . "<br>\n";
return $exifdata;
}
if ($exif["DateTime"]) {
$datetime = $exif["DateTime"];
}
else if ($exif["DateTimeOriginal"]) {
$datetime = $exif["DateTimeOriginal"];
}
else if ($exif["DateTimeDigitized"]) {
$datetime = $exif["DateTimeDigitized"];
}
if (!$datetime) {
$datetime = date ("Y-m-d H:i:s", filemtime($image));
}
list($date, $time) = explode(' ', $datetime);
$date = str_replace(':', '-', $date);
$exifdata["date"] = $date;
$exifdata["time"] = $time;
if ($exif["Make"]) {
$exifdata["camera_make"] = ucwords(strtolower($exif["Make"]));
}
if ($exif["Model"]) {
$exifdata["camera_model"] = ucwords(strtolower($exif["Model"]));
}
if (isset($exif["Flash"])) {
/*
bug#671023 from mail2061 <AT> deys <DOT> org
"The code in exif.inc.php that tests $exif["Flash"] in order
to determine whether or not the flash was fired is getting
wrong values. My FujiFilm S602 is returning '9' for 'Fired'
and '16' for 'Not Fired(compulsory)'. I reworked the boolean
test into a switch statement that handles this. However, I
suspect that this field can have additional values besides
the two I've identified."
*/
//$exifdata["flash_used"] = $exif["Flash"] ? "Yes" : "No";
// Revamped to handled more expressive flash indications
$fYN="No";
switch ($exif["Flash"]) {
// Flash Not Fired
case 16:
case 0: $fYN="No"; break;
// Flash Fired
case 9:
default: $fYN="Yes"; break;
}
$exifdata["flash_used"] = $fYN;
}
if ($exif["FocalLength"]) {
list($a, $b) = explode('/', $exif["FocalLength"]);
$exifdata["focal_length"] = sprintf("%.1fmm", $a / $b);
}
if ($exif["ExposureTime"]) {
list($a, $b) = explode('/', $exif["ExposureTime"]);
$val = $a / $b;
$exifdata["exposure"] = sprintf("%.3f s", $val);
if ($val <= 0.5) {
$exifdata["exposure"] .= sprintf(" (1/%d)", (int)(0.5 + 1 / $val));
}
}
if ($exif["ExposureProgram"]) {
$ep = $exif["ExposureProgram"];
switch ($ep) {
case 2:
$exifdata["exposure"] .= " [program (auto)]";
break;
case 3:
$exifdata["exposure"] .= " [aperture priority (semi-auto)]";
break;
case 4:
$exifdata["exposure"] .= " [shutter priority (semi-auto)]";
break;
}
}
if ($exif["FNumber"]) {
list($a, $b) = explode('/', $exif["FNumber"]);
$exifdata["aperture"] = sprintf("f/%.1f", $a / $b);
}
else if ($exif["ApertureValue"]) {
list($a, $b) = explode('/', $exif["ApertureValue"]);
$exifdata["aperture"] = sprintf("f/%.1f", $a / $b * log(2) * 0.5);
}
else if ($exif["MaxApertureValue"]) {
list($a, $b) = explode('/', $exif["MaxApertureValue"]);
$exifdata["aperture"] = sprintf("f/%.1f", $a / $b * log(2) * 0.5);
}
if ($exif["FocusDistance"]) {
$exifdata["focus_dist"] = $exif["FocusDistance"];
}
if ($exif["MeteringMode"]) {
$mm = $exif["MeteringMode"];
switch ($mm) {
case 2:
$exifdata["metering_mode"] = "center weight";
break;
case 3:
$exifdata["metering_mode"] = "spot";
break;
case 5:
$exifdata["metering_mode"] = "matrix";
break;
}
}
if ($exif["ISOSpeedRatings"]) {
$a = $exif["ISOSpeedRatings"];
if ($a < 50) { $a *= 200; }
$exifdata["iso_equiv"] = $a;
}
/* something is not quite right here
if ($exif["FocalPlaneXResolution"] && $exif["FocalPlaneResolutionUnit"]) {
$width = $exif["ExifImageWidth"];
list($a, $b) = explode('/', $exif["FocalPlaneXResolution"]);
$fpxr = $a / $b;
$fpru = $exif["FocalPlaneResolutionUnit"];
$exifdata["ccd_width"] = sprintf("%.2fmm", $width * $fpru / $fpxr);
}
*/
if ($exif["CompressedBitsPerPixel"]) {
list($a, $b) = explode('/', $exif["CompressedBitsPerPixel"]);
$val = round($a / $b);
switch ($val) {
case 1:
$exifdata["compression"] = "jpeg quality: basic";
break;
case 2:
$exifdata["compression"] = "jpeg quality: normal";
break;
case 4:
$exifdata["compression"] = "jpeg quality: fine";
break;
}
}
if ($exif["Comment"]) {
$exifdata["comment"] = $exif["Comment"];
}
return $exifdata;
}
?>
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