From 9c56abbb83145488974f5e92f84957c1eee5a38e Mon Sep 17 00:00:00 2001
From: Rik Veenboer <rik.veenboer@gmail.com>
Date: Sun, 20 Dec 2015 01:00:28 +0000
Subject: [PATCH] Add tool for copying GPS data from JPG to DNG files

---
 composer.json   |   3 +-
 gps-jpg2raw.php | 101 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+), 1 deletion(-)
 create mode 100644 gps-jpg2raw.php

diff --git a/composer.json b/composer.json
index fe66677..7057684 100644
--- a/composer.json
+++ b/composer.json
@@ -2,6 +2,7 @@
     "require": {
         "imagine/imagine": "0.5.0",
         "symfony/console": "2.4.3",
-        "symfony/yaml": "2.4.3"
+        "symfony/yaml": "2.4.3",        
+        "phpexiftool/phpexiftool": "0.4.1"
     }
 }
diff --git a/gps-jpg2raw.php b/gps-jpg2raw.php
new file mode 100644
index 0000000..ee5f79d
--- /dev/null
+++ b/gps-jpg2raw.php
@@ -0,0 +1,101 @@
+<?php
+require __DIR__ . '/vendor/autoload.php';
+
+use Monolog\Logger;
+use PHPExiftool\Reader;
+use PHPExiftool\Writer;
+use PHPExiftool\Driver\Metadata\Metadata;
+use PHPExiftool\Driver\Metadata\MetadataBag;
+
+define('PHP_WINDOWS_VERSION_BUILD');
+
+if (!isset($argv[1])) {
+    die('No directory given!');
+}
+$sDir = rtrim($argv[1], '"\'/\\');
+if (!file_exists($sDir)) {
+    die('Directory does not exist!');
+}
+
+// Scan JPG and DNG files
+$aJpg = glob(sprintf('%s%s*.jpg', $sDir, DIRECTORY_SEPARATOR));
+$aDng = glob(sprintf('%s%s*.dng', $sDir, DIRECTORY_SEPARATOR));
+
+printf("Found %d JPG files.\n", count($aJpg));
+printf("Found %d DNG files.\n", count($aDng));
+
+// Strip directory and extension
+$aJpgFiles = array_map(function($sValue) {
+    return basename($sValue, '.jpg');
+}, $aJpg);
+$aDngFiles = array_map(function($sValue) {
+    return basename($sValue, '.dng');
+}, $aDng);
+
+// Remove JPG files without corresponding DNG file
+$aFiles = array_intersect($aJpgFiles, $aDngFiles);
+foreach (array_diff($aJpgFiles, $aDngFiles) as $sJpg) {
+    printf("Omitting %s.jpg\n", $sJpg);
+    // unlink(sprintf('%s/%s.jpg', $sDir, $sJpg));
+}
+
+// Initialize exiftool
+$oLogger = new Logger('exiftool');
+$oReader = Reader::create($oLogger);
+$oWriter = Writer::create($oLogger);
+
+// Loop over files
+$iFiles = count($aFiles);
+foreach ($aFiles as $i => $sFile) {
+    printf("Processing %s (%d/%d)...\n", $sFile, $i, $iFiles);
+    
+    // Regenerate JPG and DNG file paths
+    $sJpgPath = sprintf('%s%s%s.jpg', $sDir, DIRECTORY_SEPARATOR, $sFile);
+    $sDngPath = sprintf('%s%s%s.dng', $sDir, DIRECTORY_SEPARATOR, $sFile);
+
+    // Read from JPG file
+    printf("    > Reading from JPG file.\n");
+    $oFileEntity = $oReader->files($sJpgPath)->first();        
+    $oReader->reset();
+
+    // Extract desired GPS tags
+    $aData = $aMetadataBag = array();        
+    $aKeys = array(
+        'GPS:GPSAltitude' => 'altitude',
+        'GPS:GPSLongitude' => 'longitude',
+        'GPS:GPSLatitude' => 'latitude',
+        'GPS:GPSImgDirection' => 'direction');
+
+    // Loop over all metadata
+    printf("    > Parsing metadata.\n");
+    foreach ($oFileEntity as $oMetaData) {
+        $oTag = $oMetaData->getTag();
+        $sTag = $oTag->getTagname();
+        $oValue = $oMetaData->getValue();
+
+        // Store desired tags
+        if (array_key_exists($sTag, $aKeys)) {
+            $aData[$aKeys[$sTag]] = $oValue;
+        }
+
+        // Store all GPS tags in metadata bag
+        if (strpos($sTag, 'GPS:') !== false) {
+            $aMetadataBag[] = $oMetaData;
+        }        
+    }
+
+    // Check presence of GPS data
+    if (empty($aData)) {
+        printf("    > No GPS data present!\n");
+        continue;
+    }
+    
+    // Convert values to floats
+    $aData = array_map(function ($sValue) {
+            return floatval($sValue->asString());
+        }, $aData);
+
+    // Write to DNG file
+    printf("    > Writing to DNG file.\n");
+    $oWriter->write($sDngPath, new MetadataBag($aMetadataBag));
+}
\ No newline at end of file