--- /dev/null
+<?php
+
+/**
+ * PEL: PHP Exif Library.
+ * A library with support for reading and
+ * writing all Exif headers in JPEG and TIFF images using PHP.
+ *
+ * Copyright (C) 2007 Martin Geisler.
+ *
+ * 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 in the file COPYING; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301 USA
+ */
+
+/*
+ * Contributed by Andac Aydin (aandac@gmx.de).
+ * This example shows how one can add GPS information to a JPEG image.
+ * Any Exif information in the image will be overwritten by the new
+ * information.
+ * This example includes two functions:
+ * - convertDecimalTpDMS() converts decimal GPS coordinates (how you use them
+ * in Google Maps for example) to the conventional coordinate-system
+ * used in Exif data.
+ * - addGpsInfo() adds several Exif tags to your JPEG file.
+ */
+require_once '../autoload.php';
+
+use lsolesen\pel\PelJpeg;
+use lsolesen\pel\PelTiff;
+
+/**
+ * Convert a decimal degree into degrees, minutes, and seconds.
+ *
+ * @param
+ * int the degree in the form 123.456. Must be in the interval
+ * [-180, 180].
+ *
+ * @return array a triple with the degrees, minutes, and seconds. Each
+ * value is an array itself, suitable for passing to a
+ * PelEntryRational. If the degree is outside the allowed interval,
+ * null is returned instead.
+ */
+function convertDecimalToDMS($degree)
+{
+ if ($degree > 180 || $degree < - 180) {
+ return null;
+ }
+
+ $degree = abs($degree); // make sure number is positive
+ // (no distinction here for N/S
+ // or W/E).
+
+ $seconds = $degree * 3600; // Total number of seconds.
+
+ $degrees = floor($degree); // Number of whole degrees.
+ $seconds -= $degrees * 3600; // Subtract the number of seconds
+ // taken by the degrees.
+
+ $minutes = floor($seconds / 60); // Number of whole minutes.
+ $seconds -= $minutes * 60; // Subtract the number of seconds
+ // taken by the minutes.
+
+ $seconds = round($seconds * 100, 0); // Round seconds with a 1/100th
+ // second precision.
+
+ return array(
+ array(
+ $degrees,
+ 1
+ ),
+ array(
+ $minutes,
+ 1
+ ),
+ array(
+ $seconds,
+ 100
+ )
+ );
+}
+
+/**
+ * Add GPS information to an image basic metadata.
+ * Any old Exif data
+ * is discarded.
+ *
+ * @param
+ * string the input filename.
+ *
+ * @param
+ * string the output filename. An updated copy of the input
+ * image is saved here.
+ *
+ * @param
+ * string image description.
+ *
+ * @param
+ * string user comment.
+ *
+ * @param
+ * string camera model.
+ *
+ * @param
+ * float longitude expressed as a fractional number of degrees,
+ * e.g. 12.345�. Negative values denotes degrees west of Greenwich.
+ *
+ * @param
+ * float latitude expressed as for longitude. Negative values
+ * denote degrees south of equator.
+ *
+ * @param
+ * float the altitude, negative values express an altitude
+ * below sea level.
+ *
+ * @param
+ * string the date and time.
+ */
+function addGpsInfo($input, $output, $description, $comment, $model, $longitude, $latitude, $altitude, $date_time)
+{
+ /* Load the given image into a PelJpeg object */
+ $jpeg = new PelJpeg($input);
+
+ /*
+ * Create and add empty Exif data to the image (this throws away any
+ * old Exif data in the image).
+ */
+ $exif = new PelExif();
+ $jpeg->setExif($exif);
+
+ /*
+ * Create and add TIFF data to the Exif data (Exif data is actually
+ * stored in a TIFF format).
+ */
+ $tiff = new PelTiff();
+ $exif->setTiff($tiff);
+
+ /*
+ * Create first Image File Directory and associate it with the TIFF
+ * data.
+ */
+ $ifd0 = new PelIfd(PelIfd::IFD0);
+ $tiff->setIfd($ifd0);
+
+ /*
+ * Create a sub-IFD for holding GPS information. GPS data must be
+ * below the first IFD.
+ */
+ $gps_ifd = new PelIfd(PelIfd::GPS);
+ $ifd0->addSubIfd($gps_ifd);
+
+ /*
+ * The USER_COMMENT tag must be put in a Exif sub-IFD under the
+ * first IFD.
+ */
+ $exif_ifd = new PelIfd(PelIfd::EXIF);
+ $exif_ifd->addEntry(new PelEntryUserComment($comment));
+ $ifd0->addSubIfd($exif_ifd);
+
+ $inter_ifd = new PelIfd(PelIfd::INTEROPERABILITY);
+ $ifd0->addSubIfd($inter_ifd);
+
+ $ifd0->addEntry(new PelEntryAscii(PelTag::MODEL, $model));
+ $ifd0->addEntry(new PelEntryAscii(PelTag::DATE_TIME, $date_time));
+ $ifd0->addEntry(new PelEntryAscii(PelTag::IMAGE_DESCRIPTION, $description));
+
+ $gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_VERSION_ID, 2, 2, 0, 0));
+
+ /*
+ * Use the convertDecimalToDMS function to convert the latitude from
+ * something like 12.34� to 12� 20' 42"
+ */
+ list ($hours, $minutes, $seconds) = convertDecimalToDMS($latitude);
+
+ /* We interpret a negative latitude as being south. */
+ $latitude_ref = ($latitude < 0) ? 'S' : 'N';
+
+ $gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LATITUDE_REF, $latitude_ref));
+ $gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LATITUDE, $hours, $minutes, $seconds));
+
+ /* The longitude works like the latitude. */
+ list ($hours, $minutes, $seconds) = convertDecimalToDMS($longitude);
+ $longitude_ref = ($longitude < 0) ? 'W' : 'E';
+
+ $gps_ifd->addEntry(new PelEntryAscii(PelTag::GPS_LONGITUDE_REF, $longitude_ref));
+ $gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_LONGITUDE, $hours, $minutes, $seconds));
+
+ /*
+ * Add the altitude. The absolute value is stored here, the sign is
+ * stored in the GPS_ALTITUDE_REF tag below.
+ */
+ $gps_ifd->addEntry(new PelEntryRational(PelTag::GPS_ALTITUDE, array(
+ abs($altitude),
+ 1
+ )));
+ /*
+ * The reference is set to 1 (true) if the altitude is below sea
+ * level, or 0 (false) otherwise.
+ */
+ $gps_ifd->addEntry(new PelEntryByte(PelTag::GPS_ALTITUDE_REF, (int) ($altitude < 0)));
+
+ /* Finally we store the data in the output file. */
+ file_put_contents($output, $jpeg->getBytes());
+}
projects / yaffs-website / blobdiff