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