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f75d0233 RN |
1 | /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */ |
2 | /* | |
3 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
4 | * | |
d4ec7b44 | 5 | * Copyright (C) 2011-2014, Rob Norris <rw_norris@hotmail.com> |
f75d0233 RN |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | /* | |
24 | * This uses EXIF information from images to create waypoints at those positions | |
f75d0233 | 25 | * |
c562f8f0 | 26 | * The initial implementation uses libexif, which keeps Viking a pure C program. |
72bbd562 RN |
27 | * Now libgexiv2 is available (in C as a wrapper around the more powerful libexiv2 [C++]) so this is the preferred build. |
28 | * The attentative reader will notice the use of gexiv2 is a lot simpler as well. | |
29 | * For the time being the libexif code + build is still made available. | |
f75d0233 RN |
30 | */ |
31 | #include <string.h> | |
32 | #include "geotag_exif.h" | |
72bbd562 | 33 | #include "config.h" |
f75d0233 RN |
34 | #include "globals.h" |
35 | #include "file.h" | |
36 | ||
b3eb3b98 | 37 | #include <sys/stat.h> |
73e61a6e | 38 | #ifdef HAVE_UTIME_H |
b3eb3b98 | 39 | #include <utime.h> |
73e61a6e | 40 | #endif |
b3eb3b98 RN |
41 | #include <stdlib.h> |
42 | #include <ctype.h> | |
43 | #include <math.h> | |
44 | #include <glib/gi18n.h> | |
d9599cb1 | 45 | #include <glib/gstdio.h> |
72bbd562 RN |
46 | #ifdef HAVE_LIBGEXIV2 |
47 | #include <gexiv2/gexiv2.h> | |
48 | #endif | |
49 | #ifdef HAVE_LIBEXIF | |
f75d0233 | 50 | #include <libexif/exif-data.h> |
b3eb3b98 | 51 | #include "libjpeg/jpeg-data.h" |
72bbd562 | 52 | #endif |
f75d0233 | 53 | |
72bbd562 | 54 | #ifdef HAVE_LIBGEXIV2 |
fef725de RN |
55 | // Compatibility |
56 | static void metadata_free ( GExiv2Metadata *gemd ) | |
57 | { | |
58 | #if GEXIV2_CHECK_VERSION (0,10,4) | |
59 | g_object_unref ( gemd ); | |
60 | #else | |
61 | gexiv2_metadata_free ( gemd ); | |
62 | #endif | |
63 | } | |
64 | ||
72bbd562 RN |
65 | /** |
66 | * Attempt to get a single comment from the various exif fields | |
67 | */ | |
68 | static gchar* geotag_get_exif_comment ( GExiv2Metadata *gemd ) | |
69 | { | |
70 | // | |
71 | // Try various options to create a comment | |
72 | // | |
73 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.ImageDescription" ) ) | |
74 | return g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.ImageDescription" ) ); | |
75 | ||
76 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.XPComment" ) ) | |
77 | return g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.XPComment" ) ); | |
78 | ||
79 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.XPSubject" ) ) | |
80 | return g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.XPSubject" ) ); | |
81 | ||
82 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.DateTimeOriginal" ) ) | |
83 | return g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.DateTimeOriginal" ) ); | |
84 | ||
85 | // Otherwise nothing found | |
86 | return NULL; | |
87 | } | |
88 | #endif | |
89 | ||
90 | #ifdef HAVE_LIBEXIF | |
f75d0233 RN |
91 | /** |
92 | * Attempt to get a single comment from the various exif fields | |
93 | */ | |
94 | static gchar* geotag_get_exif_comment ( ExifData *ed ) | |
95 | { | |
96 | gchar str[128]; | |
97 | ExifEntry *ee; | |
98 | // | |
99 | // Try various options to create a comment | |
100 | // | |
101 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_IMAGE_DESCRIPTION); | |
102 | if ( ee ) { | |
103 | exif_entry_get_value ( ee, str, 128 ); | |
104 | return g_strdup ( str ); | |
105 | } | |
106 | ||
107 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_COMMENT); | |
108 | if ( ee ) { | |
109 | exif_entry_get_value ( ee, str, 128 ); | |
110 | return g_strdup ( str ); | |
111 | } | |
112 | ||
113 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_SUBJECT); | |
114 | if ( ee ) { | |
115 | exif_entry_get_value ( ee, str, 128 ); | |
116 | return g_strdup ( str ); | |
117 | } | |
118 | ||
119 | // Consider using these for existing GPS info?? | |
120 | //#define EXIF_TAG_GPS_TIME_STAMP 0x0007 | |
121 | //#define EXIF_TAG_GPS_DATE_STAMP 0x001d | |
122 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
123 | if ( ee ) { | |
124 | exif_entry_get_value ( ee, str, 128 ); | |
125 | return g_strdup ( str ); | |
126 | } | |
72bbd562 | 127 | |
f75d0233 RN |
128 | // Otherwise nothing found |
129 | return NULL; | |
130 | } | |
131 | ||
132 | /** | |
133 | * Handles 3 part location Rationals | |
134 | * Handles 1 part rational (must specify 0 for the offset) | |
135 | */ | |
136 | static gdouble Rational2Double ( unsigned char *data, int offset, ExifByteOrder order ) | |
137 | { | |
138 | // Explaination from GPS Correlate 'exif-gps.cpp' v 1.6.1 | |
139 | // What we are trying to do here is convert the three rationals: | |
140 | // dd/v mm/v ss/v | |
141 | // To a decimal | |
142 | // dd.dddddd... | |
143 | // dd/v is easy: result = dd/v. | |
144 | // mm/v is harder: | |
145 | // mm | |
146 | // -- / 60 = result. | |
147 | // v | |
148 | // ss/v is sorta easy. | |
149 | // ss | |
150 | // -- / 3600 = result | |
151 | // v | |
152 | // Each part is added to the final number. | |
153 | gdouble ans; | |
154 | ExifRational er; | |
155 | er = exif_get_rational (data, order); | |
156 | ans = (gdouble)er.numerator / (gdouble)er.denominator; | |
157 | if (offset <= 0) | |
158 | return ans; | |
159 | ||
160 | er = exif_get_rational (data+(1*offset), order); | |
161 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 60.0 ); | |
162 | er = exif_get_rational (data+(2*offset), order); | |
163 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 3600.0 ); | |
164 | ||
165 | return ans; | |
166 | } | |
167 | ||
d4ec7b44 RN |
168 | static struct LatLon get_latlon ( ExifData *ed ) |
169 | { | |
170 | struct LatLon ll = { 0.0, 0.0 }; | |
171 | const struct LatLon ll0 = { 0.0, 0.0 }; | |
172 | ||
173 | gchar str[128]; | |
174 | ExifEntry *ee; | |
175 | // | |
176 | // Lat & Long is necessary to form a waypoint. | |
177 | // | |
178 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
179 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
180 | return ll0; | |
181 | ||
182 | ll.lat = Rational2Double ( ee->data, | |
183 | exif_format_get_size(ee->format), | |
184 | exif_data_get_byte_order(ed) ); | |
185 | ||
186 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE_REF); | |
187 | if ( ee ) { | |
188 | exif_entry_get_value ( ee, str, 128 ); | |
189 | if ( str[0] == 'S' ) | |
190 | ll.lat = -ll.lat; | |
191 | } | |
192 | ||
193 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
194 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
195 | return ll0; | |
196 | ||
197 | ll.lon = Rational2Double ( ee->data, | |
198 | exif_format_get_size(ee->format), | |
199 | exif_data_get_byte_order(ed) ); | |
200 | ||
201 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE_REF); | |
202 | if ( ee ) { | |
203 | exif_entry_get_value ( ee, str, 128 ); | |
204 | if ( str[0] == 'W' ) | |
205 | ll.lon = -ll.lon; | |
206 | } | |
207 | ||
208 | return ll; | |
209 | } | |
72bbd562 | 210 | #endif |
d4ec7b44 RN |
211 | |
212 | /** | |
213 | * a_geotag_get_position: | |
214 | * | |
215 | * @filename: The (JPG) file with EXIF information in it | |
216 | * | |
217 | * Returns: The position in LatLon format. | |
218 | * It will be 0,0 if some kind of failure occurs. | |
219 | */ | |
220 | struct LatLon a_geotag_get_position ( const gchar *filename ) | |
221 | { | |
222 | struct LatLon ll = { 0.0, 0.0 }; | |
223 | ||
72bbd562 RN |
224 | #ifdef HAVE_LIBGEXIV2 |
225 | GExiv2Metadata *gemd = gexiv2_metadata_new (); | |
226 | if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) { | |
227 | gdouble lat; | |
228 | gdouble lon; | |
229 | gdouble alt; | |
230 | if ( gexiv2_metadata_get_gps_info ( gemd, &lon, &lat, &alt ) ) { | |
231 | ll.lat = lat; | |
232 | ll.lon = lon; | |
233 | } | |
234 | } | |
fef725de | 235 | metadata_free ( gemd ); |
72bbd562 RN |
236 | #else |
237 | #ifdef HAVE_LIBEXIF | |
d4ec7b44 RN |
238 | // open image with libexif |
239 | ExifData *ed = exif_data_new_from_file ( filename ); | |
240 | ||
241 | // Detect EXIF load failure | |
242 | if ( !ed ) | |
243 | return ll; | |
244 | ||
245 | ExifEntry *ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
246 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
247 | if ( ! ( ee && ee->components == 4 ) ) | |
248 | goto MyReturn0; | |
249 | ||
250 | ll = get_latlon ( ed ); | |
251 | ||
252 | MyReturn0: | |
253 | // Finished with EXIF | |
254 | exif_data_free ( ed ); | |
72bbd562 RN |
255 | #endif |
256 | #endif | |
d4ec7b44 RN |
257 | |
258 | return ll; | |
259 | } | |
260 | ||
f75d0233 RN |
261 | /** |
262 | * a_geotag_create_waypoint_from_file: | |
263 | * @filename: The image file to process | |
264 | * @vcmode: The current location mode to use in the positioning of Waypoint | |
265 | * @name: Returns a name for the Waypoint (can be NULL) | |
266 | * | |
267 | * Returns: An allocated Waypoint or NULL if Waypoint could not be generated (e.g. no EXIF info) | |
268 | * | |
269 | */ | |
270 | VikWaypoint* a_geotag_create_waypoint_from_file ( const gchar *filename, VikCoordMode vcmode, gchar **name ) | |
271 | { | |
272 | // Default return values (for failures) | |
273 | *name = NULL; | |
274 | VikWaypoint *wp = NULL; | |
275 | ||
72bbd562 RN |
276 | #ifdef HAVE_LIBGEXIV2 |
277 | GExiv2Metadata *gemd = gexiv2_metadata_new (); | |
278 | if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) { | |
279 | gdouble lat; | |
280 | gdouble lon; | |
281 | gdouble alt; | |
282 | if ( gexiv2_metadata_get_gps_info ( gemd, &lon, &lat, &alt ) ) { | |
283 | struct LatLon ll; | |
284 | ll.lat = lat; | |
285 | ll.lon = lon; | |
286 | ||
287 | // | |
288 | // Now create Waypoint with acquired information | |
289 | // | |
290 | wp = vik_waypoint_new(); | |
291 | wp->visible = TRUE; | |
292 | // Set info from exif values | |
293 | // Location | |
294 | vik_coord_load_from_latlon ( &(wp->coord), vcmode, &ll ); | |
295 | // Altitude | |
296 | wp->altitude = alt; | |
297 | ||
298 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.XPTitle" ) ) | |
299 | *name = g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.XPTitle" ) ); | |
300 | wp->comment = geotag_get_exif_comment ( gemd ); | |
301 | ||
302 | vik_waypoint_set_image ( wp, filename ); | |
303 | } | |
304 | } | |
fef725de | 305 | metadata_free ( gemd ); |
72bbd562 RN |
306 | #else |
307 | #ifdef HAVE_LIBEXIF | |
f75d0233 RN |
308 | // TODO use log? |
309 | //ExifLog *log = NULL; | |
310 | ||
311 | // open image with libexif | |
312 | ExifData *ed = exif_data_new_from_file ( filename ); | |
313 | ||
314 | // Detect EXIF load failure | |
315 | if ( !ed ) | |
316 | // return with no Waypoint | |
317 | return wp; | |
318 | ||
319 | struct LatLon ll; | |
320 | ||
321 | gchar str[128]; | |
322 | ExifEntry *ee; | |
323 | ||
324 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
325 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
326 | if ( ! ( ee && ee->components == 4 ) ) | |
327 | goto MyReturn; | |
328 | // Could test for these versions explicitly but may have byte order issues... | |
329 | //if ( ! ( ee->data[0] == 2 && ee->data[2] == 0 && ee->data[3] == 0 ) ) | |
330 | // goto MyReturn; | |
331 | ||
d4ec7b44 | 332 | ll = get_latlon ( ed ); |
f75d0233 | 333 | |
d4ec7b44 RN |
334 | // Hopefully won't have valid images at 0,0! |
335 | if ( ll.lat == 0.0 && ll.lon == 0.0 ) | |
f75d0233 RN |
336 | goto MyReturn; |
337 | ||
f75d0233 RN |
338 | // |
339 | // Not worried if none of the other fields exist, as can default the values to something | |
340 | // | |
341 | ||
342 | gdouble alt = VIK_DEFAULT_ALTITUDE; | |
343 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE); | |
344 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_RATIONAL ) { | |
345 | alt = Rational2Double ( ee->data, | |
346 | 0, | |
347 | exif_data_get_byte_order(ed) ); | |
348 | ||
349 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE_REF); | |
350 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_BYTE && ee->data[0] == 1 ) | |
351 | alt = -alt; | |
352 | } | |
353 | ||
354 | // Name | |
355 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
356 | if ( ee ) { | |
357 | exif_entry_get_value ( ee, str, 128 ); | |
358 | *name = g_strdup ( str ); | |
359 | } | |
360 | ||
361 | // | |
362 | // Now create Waypoint with acquired information | |
363 | // | |
364 | wp = vik_waypoint_new(); | |
365 | wp->visible = TRUE; | |
366 | // Set info from exif values | |
367 | // Location | |
368 | vik_coord_load_from_latlon ( &(wp->coord), vcmode, &ll ); | |
369 | // Altitude | |
370 | wp->altitude = alt; | |
371 | ||
372 | wp->comment = geotag_get_exif_comment ( ed ); | |
373 | ||
374 | vik_waypoint_set_image ( wp, filename ); | |
375 | ||
376 | MyReturn: | |
377 | // Finished with EXIF | |
378 | exif_data_free ( ed ); | |
72bbd562 RN |
379 | #endif |
380 | #endif | |
f75d0233 RN |
381 | |
382 | return wp; | |
383 | } | |
384 | ||
385 | /** | |
cbac0d22 | 386 | * a_geotag_waypoint_positioned: |
f75d0233 RN |
387 | * @filename: The image file to process |
388 | * @coord: The location for positioning the Waypoint | |
389 | * @name: Returns a name for the Waypoint (can be NULL) | |
cbac0d22 | 390 | * @waypoint: An existing waypoint to update (can be NULL to generate a new waypoint) |
f75d0233 | 391 | * |
cbac0d22 RN |
392 | * Returns: An allocated waypoint if the input waypoint is NULL, |
393 | * otherwise the passed in waypoint is updated | |
f75d0233 RN |
394 | * |
395 | * Here EXIF processing is used to get non position related information (i.e. just the comment) | |
396 | * | |
397 | */ | |
cbac0d22 | 398 | VikWaypoint* a_geotag_waypoint_positioned ( const gchar *filename, VikCoord coord, gdouble alt, gchar **name, VikWaypoint *wp ) |
f75d0233 RN |
399 | { |
400 | *name = NULL; | |
cbac0d22 RN |
401 | if ( wp == NULL ) { |
402 | // Need to create waypoint | |
403 | wp = vik_waypoint_new(); | |
404 | wp->visible = TRUE; | |
405 | } | |
f75d0233 RN |
406 | wp->coord = coord; |
407 | wp->altitude = alt; | |
408 | ||
72bbd562 RN |
409 | #ifdef HAVE_LIBGEXIV2 |
410 | GExiv2Metadata *gemd = gexiv2_metadata_new (); | |
411 | if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) { | |
412 | wp->comment = geotag_get_exif_comment ( gemd ); | |
413 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Image.XPTitle" ) ) | |
414 | *name = g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.XPTitle" ) ); | |
415 | } | |
fef725de | 416 | metadata_free ( gemd ); |
72bbd562 RN |
417 | #else |
418 | #ifdef HAVE_LIBEXIF | |
f75d0233 RN |
419 | ExifData *ed = exif_data_new_from_file ( filename ); |
420 | ||
421 | // Set info from exif values | |
422 | if ( ed ) { | |
423 | wp->comment = geotag_get_exif_comment ( ed ); | |
424 | ||
425 | gchar str[128]; | |
426 | ExifEntry *ee; | |
427 | // Name | |
428 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
429 | if ( ee ) { | |
430 | exif_entry_get_value ( ee, str, 128 ); | |
431 | *name = g_strdup ( str ); | |
432 | } | |
433 | ||
434 | // Finished with EXIF | |
435 | exif_data_free ( ed ); | |
436 | } | |
72bbd562 RN |
437 | #endif |
438 | #endif | |
f75d0233 RN |
439 | |
440 | vik_waypoint_set_image ( wp, filename ); | |
441 | ||
f75d0233 RN |
442 | return wp; |
443 | } | |
b3eb3b98 RN |
444 | |
445 | /** | |
446 | * a_geotag_get_exif_date_from_file: | |
447 | * @filename: The image file to process | |
448 | * @has_GPS_info: Returns whether the file has existing GPS information | |
449 | * | |
450 | * Returns: An allocated string with the date and time in EXIF_DATE_FORMAT, otherwise NULL if some kind of failure | |
451 | * | |
452 | * Here EXIF processing is used to get time information | |
453 | * | |
454 | */ | |
455 | gchar* a_geotag_get_exif_date_from_file ( const gchar *filename, gboolean *has_GPS_info ) | |
456 | { | |
457 | gchar* datetime = NULL; | |
06949e05 | 458 | *has_GPS_info = FALSE; |
b3eb3b98 | 459 | |
72bbd562 RN |
460 | #ifdef HAVE_LIBGEXIV2 |
461 | GExiv2Metadata *gemd = gexiv2_metadata_new (); | |
462 | if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) { | |
463 | gdouble lat, lon; | |
464 | *has_GPS_info = ( gexiv2_metadata_get_gps_longitude(gemd,&lon) && gexiv2_metadata_get_gps_latitude(gemd,&lat) ); | |
465 | ||
466 | // Prefer 'Photo' version over 'Image' | |
467 | if ( gexiv2_metadata_has_tag ( gemd, "Exif.Photo.DateTimeOriginal" ) ) | |
468 | datetime = g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Photo.DateTimeOriginal" ) ); | |
469 | else | |
470 | datetime = g_strdup ( gexiv2_metadata_get_tag_interpreted_string ( gemd, "Exif.Image.DateTimeOriginal" ) ); | |
471 | } | |
fef725de | 472 | metadata_free ( gemd ); |
72bbd562 RN |
473 | #else |
474 | #ifdef HAVE_LIBEXIF | |
b3eb3b98 RN |
475 | ExifData *ed = exif_data_new_from_file ( filename ); |
476 | ||
477 | // Detect EXIF load failure | |
478 | if ( !ed ) | |
479 | return datetime; | |
480 | ||
481 | gchar str[128]; | |
482 | ExifEntry *ee; | |
483 | ||
484 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
485 | if ( ee ) { | |
486 | exif_entry_get_value ( ee, str, 128 ); | |
487 | datetime = g_strdup ( str ); | |
488 | } | |
489 | ||
490 | // Check GPS Info | |
06949e05 | 491 | |
b3eb3b98 RN |
492 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); |
493 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
494 | if ( ee && ee->components == 4 ) | |
495 | *has_GPS_info = TRUE; | |
496 | ||
06949e05 RN |
497 | // Check other basic GPS fields exist too |
498 | // I have encountered some images which have just the EXIF_TAG_GPS_VERSION_ID but nothing else | |
499 | // So to confirm check more EXIF GPS TAGS: | |
500 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
501 | if ( !ee ) | |
502 | *has_GPS_info = FALSE; | |
503 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
504 | if ( !ee ) | |
505 | *has_GPS_info = FALSE; | |
506 | ||
b3eb3b98 | 507 | exif_data_free ( ed ); |
72bbd562 RN |
508 | #endif |
509 | #endif | |
b3eb3b98 RN |
510 | return datetime; |
511 | } | |
512 | ||
513 | ||
72bbd562 | 514 | #ifdef HAVE_LIBEXIF |
b3eb3b98 RN |
515 | /**! If the entry doesn't exist, create it. |
516 | * Based on exif command line action_create_value function in exif 0.6.20 | |
517 | */ | |
518 | static ExifEntry* my_exif_create_value (ExifData *ed, ExifTag tag, ExifIfd ifd) | |
519 | { | |
520 | ExifEntry *e = exif_content_get_entry (ed->ifd[ifd], tag); | |
521 | if ( !e ) { | |
522 | e = exif_entry_new (); | |
523 | exif_content_add_entry (ed->ifd[ifd], e); | |
524 | ||
525 | exif_entry_initialize (e, tag); | |
526 | ||
527 | // exif_entry_initialize doesn't seem to do much, especially for the GPS tags | |
528 | // so have to setup fields ourselves: | |
529 | e->tag = tag; | |
530 | ||
531 | if ( tag == EXIF_TAG_GPS_VERSION_ID ) { | |
532 | e->format = EXIF_FORMAT_BYTE; | |
533 | e->components = 4; | |
534 | e->size = sizeof (char) * e->components; | |
535 | if ( e->data ) | |
536 | g_free (e->data); | |
537 | e->data = g_malloc (e->size); | |
538 | } | |
539 | if ( tag == EXIF_TAG_GPS_MAP_DATUM || | |
540 | tag == EXIF_TAG_GPS_LATITUDE_REF || tag == EXIF_TAG_GPS_LONGITUDE_REF || | |
541 | tag == EXIF_TAG_GPS_PROCESSING_METHOD ) { | |
542 | e->format = EXIF_FORMAT_ASCII; | |
543 | // NB Allocation is handled later on when the actual string used is known | |
544 | } | |
545 | if ( tag == EXIF_TAG_GPS_LATITUDE || tag == EXIF_TAG_GPS_LONGITUDE ) { | |
546 | e->format = EXIF_FORMAT_RATIONAL; | |
547 | e->components = 3; | |
548 | e->size = sizeof (ExifRational) * e->components; | |
549 | if ( e->data ) | |
550 | g_free (e->data); | |
551 | e->data = g_malloc (e->size); | |
552 | } | |
553 | if ( tag == EXIF_TAG_GPS_ALTITUDE ) { | |
554 | e->format = EXIF_FORMAT_RATIONAL; | |
555 | e->components = 1; | |
556 | e->size = sizeof (ExifRational) * e->components; | |
557 | if ( e->data ) | |
558 | g_free (e->data); | |
559 | e->data = g_malloc (e->size); | |
560 | } | |
561 | if ( tag == EXIF_TAG_GPS_ALTITUDE_REF ) { | |
562 | e->components = 1; | |
563 | e->size = sizeof (char) * e->components; | |
564 | if ( e->data ) | |
565 | g_free (e->data); | |
566 | e->data = g_malloc (e->size); | |
567 | } | |
568 | /* The entry has been added to the IFD, so we can unref it */ | |
569 | //exif_entry_unref(e); | |
570 | // Crashes later on, when saving to jpeg if the above unref is enabled!! | |
571 | // ?Some other malloc problem somewhere? | |
572 | } | |
573 | return e; | |
574 | } | |
575 | ||
576 | /** Heavily based on convert_arg_to_entry from exif command line tool. | |
577 | * But without ExifLog, exitting, use of g_* io functions | |
578 | * and can take a gdouble value instead of a string | |
579 | */ | |
580 | static void convert_to_entry (const char *set_value, gdouble gdvalue, ExifEntry *e, ExifByteOrder o) | |
581 | { | |
582 | unsigned int i, numcomponents; | |
583 | char *value_p = NULL; | |
584 | char *buf = NULL; | |
585 | /* | |
586 | * ASCII strings are handled separately, | |
587 | * since they don't require any conversion. | |
588 | */ | |
589 | if (e->format == EXIF_FORMAT_ASCII || | |
590 | e->tag == EXIF_TAG_USER_COMMENT) { | |
591 | if (e->data) g_free (e->data); | |
592 | e->components = strlen (set_value) + 1; | |
593 | if (e->tag == EXIF_TAG_USER_COMMENT) | |
594 | e->components += 8 - 1; | |
595 | e->size = sizeof (char) * e->components; | |
596 | e->data = g_malloc (e->size); | |
597 | if (!e->data) { | |
598 | g_warning (_("Not enough memory.")); | |
599 | return; | |
600 | } | |
601 | if (e->tag == EXIF_TAG_USER_COMMENT) { | |
602 | /* assume ASCII charset */ | |
603 | /* TODO: get this from the current locale */ | |
604 | memcpy ((char *) e->data, "ASCII\0\0\0", 8); | |
605 | memcpy ((char *) e->data + 8, set_value, | |
606 | strlen (set_value)); | |
607 | } else | |
608 | strcpy ((char *) e->data, set_value); | |
609 | return; | |
610 | } | |
611 | ||
612 | /* | |
613 | * Make sure we can handle this entry | |
614 | */ | |
615 | if ((e->components == 0) && *set_value) { | |
616 | g_warning (_("Setting a value for this tag is unsupported!")); | |
617 | return; | |
618 | } | |
619 | ||
620 | gboolean use_string = (set_value != NULL); | |
621 | if ( use_string ) { | |
622 | /* Copy the string so we can modify it */ | |
623 | buf = g_strdup (set_value); | |
624 | if (!buf) | |
625 | return; | |
626 | value_p = strtok (buf, " "); | |
627 | } | |
628 | ||
629 | numcomponents = e->components; | |
630 | for (i = 0; i < numcomponents; ++i) { | |
631 | unsigned char s; | |
632 | ||
633 | if ( use_string ) { | |
634 | if (!value_p) { | |
635 | g_warning (_("Too few components specified (need %d, found %d)\n"), numcomponents, i); | |
636 | return; | |
637 | } | |
638 | if (!isdigit(*value_p) && (*value_p != '+') && (*value_p != '-')) { | |
639 | g_warning (_("Numeric value expected\n")); | |
640 | return; | |
641 | } | |
642 | } | |
643 | ||
644 | s = exif_format_get_size (e->format); | |
645 | switch (e->format) { | |
646 | case EXIF_FORMAT_ASCII: | |
647 | g_warning (_("This shouldn't happen!")); | |
648 | return; | |
649 | break; | |
650 | case EXIF_FORMAT_SHORT: | |
651 | exif_set_short (e->data + (s * i), o, atoi (value_p)); | |
652 | break; | |
653 | case EXIF_FORMAT_SSHORT: | |
654 | exif_set_sshort (e->data + (s * i), o, atoi (value_p)); | |
655 | break; | |
656 | case EXIF_FORMAT_RATIONAL: { | |
657 | ExifRational er; | |
658 | ||
659 | double val = 0.0 ; | |
660 | if ( use_string && value_p ) | |
661 | val = fabs (atol (value_p)); | |
662 | else | |
663 | val = fabs (gdvalue); | |
664 | ||
665 | if ( i == 0 ) { | |
666 | // One (or first) part rational | |
667 | ||
668 | // Sneak peek into tag as location tags need rounding down to give just the degrees part | |
669 | if ( e->tag == EXIF_TAG_GPS_LATITUDE || e->tag == EXIF_TAG_GPS_LONGITUDE ) { | |
670 | er.numerator = (ExifLong) floor ( val ); | |
671 | er.denominator = 1.0; | |
672 | } | |
673 | else { | |
674 | // I don't see any point in doing anything too complicated here, | |
675 | // such as trying to work out the 'best' denominator | |
676 | // For the moment use KISS principle. | |
677 | // Fix a precision of 1/100 metre as that's more than enough for GPS accuracy especially altitudes! | |
678 | er.denominator = 100.0; | |
679 | er.numerator = (ExifLong) (val * er.denominator); | |
680 | } | |
681 | } | |
682 | ||
683 | // Now for Location 3 part rationals do Mins and Seconds format | |
684 | ||
685 | // Rounded down minutes | |
686 | if ( i == 1 ) { | |
687 | er.denominator = 1.0; | |
688 | er.numerator = (ExifLong) ( (int) floor ( ( val - floor (val) ) * 60.0 ) ); | |
689 | } | |
690 | ||
691 | // Finally seconds | |
692 | if ( i == 2 ) { | |
693 | er.denominator = 100.0; | |
694 | ||
695 | // Fractional minute. | |
696 | double FracPart = ((val - floor(val)) * 60) - (double)(int) floor ( ( val - floor (val) ) * 60.0 ); | |
697 | er.numerator = (ExifLong) ( (int)floor(FracPart * 6000) ); // Convert to seconds. | |
698 | } | |
699 | exif_set_rational (e->data + (s * i), o, er ); | |
700 | break; | |
701 | } | |
702 | case EXIF_FORMAT_LONG: | |
703 | exif_set_long (e->data + (s * i), o, atol (value_p)); | |
704 | break; | |
705 | case EXIF_FORMAT_SLONG: | |
706 | exif_set_slong (e->data + (s * i), o, atol (value_p)); | |
707 | break; | |
708 | case EXIF_FORMAT_BYTE: | |
709 | case EXIF_FORMAT_SBYTE: | |
710 | case EXIF_FORMAT_UNDEFINED: /* treat as byte array */ | |
711 | e->data[s * i] = atoi (value_p); | |
712 | break; | |
713 | case EXIF_FORMAT_FLOAT: | |
714 | case EXIF_FORMAT_DOUBLE: | |
715 | case EXIF_FORMAT_SRATIONAL: | |
716 | default: | |
717 | g_warning (_("Not yet implemented!")); | |
718 | return; | |
719 | } | |
720 | ||
721 | if ( use_string ) | |
722 | value_p = strtok (NULL, " "); | |
723 | ||
724 | } | |
725 | ||
726 | g_free (buf); | |
727 | ||
728 | if ( use_string ) | |
729 | if ( value_p ) | |
730 | g_warning (_("Warning; Too many components specified!")); | |
731 | } | |
72bbd562 | 732 | #endif |
b3eb3b98 RN |
733 | |
734 | /** | |
735 | * a_geotag_write_exif_gps: | |
736 | * @filename: The image file to save information in | |
737 | * @coord: The location | |
738 | * @alt: The elevation | |
739 | * | |
740 | * Returns: A value indicating success: 0, or some other value for failure | |
741 | * | |
742 | */ | |
743 | gint a_geotag_write_exif_gps ( const gchar *filename, VikCoord coord, gdouble alt, gboolean no_change_mtime ) | |
744 | { | |
745 | gint result = 0; // OK so far... | |
746 | ||
747 | // Save mtime for later use | |
748 | struct stat stat_save; | |
749 | if ( no_change_mtime ) | |
c5ecc990 RN |
750 | if ( stat ( filename, &stat_save ) != 0 ) |
751 | g_warning ( "%s couldn't read: %s", __FUNCTION__, filename ); | |
b3eb3b98 | 752 | |
72bbd562 RN |
753 | #ifdef HAVE_LIBGEXIV2 |
754 | GExiv2Metadata *gemd = gexiv2_metadata_new (); | |
755 | if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) { | |
756 | struct LatLon ll; | |
757 | vik_coord_to_latlon ( &coord, &ll ); | |
758 | if ( ! gexiv2_metadata_set_gps_info ( gemd, ll.lon, ll.lat, alt ) ) { | |
759 | result = 1; // Failed | |
760 | } | |
761 | else { | |
762 | GError *error = NULL; | |
763 | if ( ! gexiv2_metadata_save_file ( gemd, filename, &error ) ) { | |
764 | result = 2; | |
765 | g_warning ( "Write EXIF failure:%s" , error->message ); | |
766 | g_error_free ( error ); | |
767 | } | |
768 | } | |
769 | } | |
fef725de | 770 | metadata_free ( gemd ); |
72bbd562 RN |
771 | #else |
772 | #ifdef HAVE_LIBEXIF | |
b3eb3b98 RN |
773 | /* |
774 | Appears libexif doesn't actually support writing EXIF data directly to files | |
775 | Thus embed command line exif writing method within Viking | |
776 | (for example this is done by Enlightment - http://www.enlightenment.org/ ) | |
777 | This appears to be JPEG only, but is probably 99% of our use case | |
778 | Alternatively consider using libexiv2 and C++... | |
779 | */ | |
780 | ||
781 | // Actual EXIF settings here... | |
782 | JPEGData *jdata; | |
783 | ||
784 | /* Parse the JPEG file. */ | |
785 | jdata = jpeg_data_new (); | |
786 | jpeg_data_load_file (jdata, filename); | |
787 | ||
788 | // Get current values | |
789 | ExifData *ed = exif_data_new_from_file ( filename ); | |
790 | if ( !ed ) | |
791 | ed = exif_data_new (); | |
792 | ||
793 | // Update ExifData with our new settings | |
794 | ExifEntry *ee; | |
795 | // | |
796 | // I don't understand it, but when saving the 'ed' nothing gets set after putting in the GPS ID tag - so it must come last | |
797 | // (unless of course there is some bug in the setting of the ID, that prevents subsequent tags) | |
798 | // | |
799 | ||
800 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE, EXIF_IFD_GPS); | |
801 | convert_to_entry ( NULL, alt, ee, exif_data_get_byte_order(ed) ); | |
802 | ||
803 | // byte 0 meaning "sea level" or 1 if the value is negative. | |
804 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE_REF, EXIF_IFD_GPS); | |
805 | convert_to_entry ( alt < 0.0 ? "1" : "0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
806 | ||
807 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_PROCESSING_METHOD, EXIF_IFD_GPS); | |
808 | // see http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html | |
809 | convert_to_entry ( "MANUAL", 0.0, ee, exif_data_get_byte_order(ed) ); | |
810 | ||
811 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_MAP_DATUM, EXIF_IFD_GPS); | |
812 | convert_to_entry ( "WGS-84", 0.0, ee, exif_data_get_byte_order(ed) ); | |
813 | ||
814 | struct LatLon ll; | |
815 | vik_coord_to_latlon ( &coord, &ll ); | |
816 | ||
817 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE_REF, EXIF_IFD_GPS); | |
818 | // N or S | |
819 | convert_to_entry ( ll.lat < 0.0 ? "S" : "N", 0.0, ee, exif_data_get_byte_order(ed) ); | |
820 | ||
821 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE, EXIF_IFD_GPS); | |
822 | convert_to_entry ( NULL, ll.lat, ee, exif_data_get_byte_order(ed) ); | |
823 | ||
824 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE_REF, EXIF_IFD_GPS); | |
825 | // E or W | |
826 | convert_to_entry ( ll.lon < 0.0 ? "W" : "E", 0.0, ee, exif_data_get_byte_order(ed) ); | |
827 | ||
828 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE, EXIF_IFD_GPS); | |
829 | convert_to_entry ( NULL, ll.lon, ee, exif_data_get_byte_order(ed) ); | |
830 | ||
831 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_VERSION_ID, EXIF_IFD_GPS); | |
832 | //convert_to_entry ( "2 0 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
833 | convert_to_entry ( "2 2 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
834 | ||
835 | jpeg_data_set_exif_data (jdata, ed); | |
836 | ||
837 | if ( jdata ) { | |
838 | /* Save the modified image. */ | |
839 | result = jpeg_data_save_file (jdata, filename); | |
840 | ||
841 | // Convert result from 1 for success, 0 for failure into our scheme | |
842 | result = !result; | |
843 | ||
844 | jpeg_data_unref (jdata); | |
845 | } | |
846 | else { | |
847 | // Epic fail - file probably not a JPEG | |
848 | result = 2; | |
849 | } | |
850 | ||
72bbd562 RN |
851 | exif_data_free ( ed ); |
852 | #endif | |
853 | #endif | |
854 | ||
b3eb3b98 RN |
855 | if ( no_change_mtime ) { |
856 | // Restore mtime, using the saved value | |
857 | struct stat stat_tmp; | |
858 | struct utimbuf utb; | |
fd437981 | 859 | (void)stat ( filename, &stat_tmp ); |
b3eb3b98 RN |
860 | utb.actime = stat_tmp.st_atime; |
861 | utb.modtime = stat_save.st_mtime; | |
73e61a6e RN |
862 | // Not security critical, thus potential Time of Check Time of Use race condition is not bad |
863 | // coverity[toctou] | |
864 | if ( g_utime ( filename, &utb ) != 0 ) | |
865 | g_warning ( "%s couldn't set time on: %s", __FUNCTION__, filename ); | |
b3eb3b98 RN |
866 | } |
867 | ||
868 | return result; | |
869 | } |