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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 RN |
25 | * |
26 | * For the implementation I have chosen to use libexif, which keeps Viking a pure C program | |
27 | * For an alternative implementation (a la gpscorrelate), one could use libeviv2 but it appears to be C++ only. | |
28 | */ | |
29 | #include <string.h> | |
30 | #include "geotag_exif.h" | |
31 | #include "globals.h" | |
32 | #include "file.h" | |
33 | ||
b3eb3b98 RN |
34 | #include <sys/stat.h> |
35 | #include <utime.h> | |
36 | #include <stdlib.h> | |
37 | #include <ctype.h> | |
38 | #include <math.h> | |
39 | #include <glib/gi18n.h> | |
d9599cb1 | 40 | #include <glib/gstdio.h> |
f75d0233 | 41 | #include <libexif/exif-data.h> |
b3eb3b98 | 42 | #include "libjpeg/jpeg-data.h" |
f75d0233 RN |
43 | |
44 | /** | |
45 | * Attempt to get a single comment from the various exif fields | |
46 | */ | |
47 | static gchar* geotag_get_exif_comment ( ExifData *ed ) | |
48 | { | |
49 | gchar str[128]; | |
50 | ExifEntry *ee; | |
51 | // | |
52 | // Try various options to create a comment | |
53 | // | |
54 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_IMAGE_DESCRIPTION); | |
55 | if ( ee ) { | |
56 | exif_entry_get_value ( ee, str, 128 ); | |
57 | return g_strdup ( str ); | |
58 | } | |
59 | ||
60 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_COMMENT); | |
61 | if ( ee ) { | |
62 | exif_entry_get_value ( ee, str, 128 ); | |
63 | return g_strdup ( str ); | |
64 | } | |
65 | ||
66 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_SUBJECT); | |
67 | if ( ee ) { | |
68 | exif_entry_get_value ( ee, str, 128 ); | |
69 | return g_strdup ( str ); | |
70 | } | |
71 | ||
72 | // Consider using these for existing GPS info?? | |
73 | //#define EXIF_TAG_GPS_TIME_STAMP 0x0007 | |
74 | //#define EXIF_TAG_GPS_DATE_STAMP 0x001d | |
75 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
76 | if ( ee ) { | |
77 | exif_entry_get_value ( ee, str, 128 ); | |
78 | return g_strdup ( str ); | |
79 | } | |
80 | ||
81 | // Otherwise nothing found | |
82 | return NULL; | |
83 | } | |
84 | ||
85 | /** | |
86 | * Handles 3 part location Rationals | |
87 | * Handles 1 part rational (must specify 0 for the offset) | |
88 | */ | |
89 | static gdouble Rational2Double ( unsigned char *data, int offset, ExifByteOrder order ) | |
90 | { | |
91 | // Explaination from GPS Correlate 'exif-gps.cpp' v 1.6.1 | |
92 | // What we are trying to do here is convert the three rationals: | |
93 | // dd/v mm/v ss/v | |
94 | // To a decimal | |
95 | // dd.dddddd... | |
96 | // dd/v is easy: result = dd/v. | |
97 | // mm/v is harder: | |
98 | // mm | |
99 | // -- / 60 = result. | |
100 | // v | |
101 | // ss/v is sorta easy. | |
102 | // ss | |
103 | // -- / 3600 = result | |
104 | // v | |
105 | // Each part is added to the final number. | |
106 | gdouble ans; | |
107 | ExifRational er; | |
108 | er = exif_get_rational (data, order); | |
109 | ans = (gdouble)er.numerator / (gdouble)er.denominator; | |
110 | if (offset <= 0) | |
111 | return ans; | |
112 | ||
113 | er = exif_get_rational (data+(1*offset), order); | |
114 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 60.0 ); | |
115 | er = exif_get_rational (data+(2*offset), order); | |
116 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 3600.0 ); | |
117 | ||
118 | return ans; | |
119 | } | |
120 | ||
d4ec7b44 RN |
121 | static struct LatLon get_latlon ( ExifData *ed ) |
122 | { | |
123 | struct LatLon ll = { 0.0, 0.0 }; | |
124 | const struct LatLon ll0 = { 0.0, 0.0 }; | |
125 | ||
126 | gchar str[128]; | |
127 | ExifEntry *ee; | |
128 | // | |
129 | // Lat & Long is necessary to form a waypoint. | |
130 | // | |
131 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
132 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
133 | return ll0; | |
134 | ||
135 | ll.lat = Rational2Double ( ee->data, | |
136 | exif_format_get_size(ee->format), | |
137 | exif_data_get_byte_order(ed) ); | |
138 | ||
139 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE_REF); | |
140 | if ( ee ) { | |
141 | exif_entry_get_value ( ee, str, 128 ); | |
142 | if ( str[0] == 'S' ) | |
143 | ll.lat = -ll.lat; | |
144 | } | |
145 | ||
146 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
147 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
148 | return ll0; | |
149 | ||
150 | ll.lon = Rational2Double ( ee->data, | |
151 | exif_format_get_size(ee->format), | |
152 | exif_data_get_byte_order(ed) ); | |
153 | ||
154 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE_REF); | |
155 | if ( ee ) { | |
156 | exif_entry_get_value ( ee, str, 128 ); | |
157 | if ( str[0] == 'W' ) | |
158 | ll.lon = -ll.lon; | |
159 | } | |
160 | ||
161 | return ll; | |
162 | } | |
163 | ||
164 | /** | |
165 | * a_geotag_get_position: | |
166 | * | |
167 | * @filename: The (JPG) file with EXIF information in it | |
168 | * | |
169 | * Returns: The position in LatLon format. | |
170 | * It will be 0,0 if some kind of failure occurs. | |
171 | */ | |
172 | struct LatLon a_geotag_get_position ( const gchar *filename ) | |
173 | { | |
174 | struct LatLon ll = { 0.0, 0.0 }; | |
175 | ||
176 | // open image with libexif | |
177 | ExifData *ed = exif_data_new_from_file ( filename ); | |
178 | ||
179 | // Detect EXIF load failure | |
180 | if ( !ed ) | |
181 | return ll; | |
182 | ||
183 | ExifEntry *ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
184 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
185 | if ( ! ( ee && ee->components == 4 ) ) | |
186 | goto MyReturn0; | |
187 | ||
188 | ll = get_latlon ( ed ); | |
189 | ||
190 | MyReturn0: | |
191 | // Finished with EXIF | |
192 | exif_data_free ( ed ); | |
193 | ||
194 | return ll; | |
195 | } | |
196 | ||
f75d0233 RN |
197 | /** |
198 | * a_geotag_create_waypoint_from_file: | |
199 | * @filename: The image file to process | |
200 | * @vcmode: The current location mode to use in the positioning of Waypoint | |
201 | * @name: Returns a name for the Waypoint (can be NULL) | |
202 | * | |
203 | * Returns: An allocated Waypoint or NULL if Waypoint could not be generated (e.g. no EXIF info) | |
204 | * | |
205 | */ | |
206 | VikWaypoint* a_geotag_create_waypoint_from_file ( const gchar *filename, VikCoordMode vcmode, gchar **name ) | |
207 | { | |
208 | // Default return values (for failures) | |
209 | *name = NULL; | |
210 | VikWaypoint *wp = NULL; | |
211 | ||
212 | // TODO use log? | |
213 | //ExifLog *log = NULL; | |
214 | ||
215 | // open image with libexif | |
216 | ExifData *ed = exif_data_new_from_file ( filename ); | |
217 | ||
218 | // Detect EXIF load failure | |
219 | if ( !ed ) | |
220 | // return with no Waypoint | |
221 | return wp; | |
222 | ||
223 | struct LatLon ll; | |
224 | ||
225 | gchar str[128]; | |
226 | ExifEntry *ee; | |
227 | ||
228 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
229 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
230 | if ( ! ( ee && ee->components == 4 ) ) | |
231 | goto MyReturn; | |
232 | // Could test for these versions explicitly but may have byte order issues... | |
233 | //if ( ! ( ee->data[0] == 2 && ee->data[2] == 0 && ee->data[3] == 0 ) ) | |
234 | // goto MyReturn; | |
235 | ||
d4ec7b44 | 236 | ll = get_latlon ( ed ); |
f75d0233 | 237 | |
d4ec7b44 RN |
238 | // Hopefully won't have valid images at 0,0! |
239 | if ( ll.lat == 0.0 && ll.lon == 0.0 ) | |
f75d0233 RN |
240 | goto MyReturn; |
241 | ||
f75d0233 RN |
242 | // |
243 | // Not worried if none of the other fields exist, as can default the values to something | |
244 | // | |
245 | ||
246 | gdouble alt = VIK_DEFAULT_ALTITUDE; | |
247 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE); | |
248 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_RATIONAL ) { | |
249 | alt = Rational2Double ( ee->data, | |
250 | 0, | |
251 | exif_data_get_byte_order(ed) ); | |
252 | ||
253 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE_REF); | |
254 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_BYTE && ee->data[0] == 1 ) | |
255 | alt = -alt; | |
256 | } | |
257 | ||
258 | // Name | |
259 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
260 | if ( ee ) { | |
261 | exif_entry_get_value ( ee, str, 128 ); | |
262 | *name = g_strdup ( str ); | |
263 | } | |
264 | ||
265 | // | |
266 | // Now create Waypoint with acquired information | |
267 | // | |
268 | wp = vik_waypoint_new(); | |
269 | wp->visible = TRUE; | |
270 | // Set info from exif values | |
271 | // Location | |
272 | vik_coord_load_from_latlon ( &(wp->coord), vcmode, &ll ); | |
273 | // Altitude | |
274 | wp->altitude = alt; | |
275 | ||
276 | wp->comment = geotag_get_exif_comment ( ed ); | |
277 | ||
278 | vik_waypoint_set_image ( wp, filename ); | |
279 | ||
280 | MyReturn: | |
281 | // Finished with EXIF | |
282 | exif_data_free ( ed ); | |
283 | ||
284 | return wp; | |
285 | } | |
286 | ||
287 | /** | |
cbac0d22 | 288 | * a_geotag_waypoint_positioned: |
f75d0233 RN |
289 | * @filename: The image file to process |
290 | * @coord: The location for positioning the Waypoint | |
291 | * @name: Returns a name for the Waypoint (can be NULL) | |
cbac0d22 | 292 | * @waypoint: An existing waypoint to update (can be NULL to generate a new waypoint) |
f75d0233 | 293 | * |
cbac0d22 RN |
294 | * Returns: An allocated waypoint if the input waypoint is NULL, |
295 | * otherwise the passed in waypoint is updated | |
f75d0233 RN |
296 | * |
297 | * Here EXIF processing is used to get non position related information (i.e. just the comment) | |
298 | * | |
299 | */ | |
cbac0d22 | 300 | VikWaypoint* a_geotag_waypoint_positioned ( const gchar *filename, VikCoord coord, gdouble alt, gchar **name, VikWaypoint *wp ) |
f75d0233 RN |
301 | { |
302 | *name = NULL; | |
cbac0d22 RN |
303 | if ( wp == NULL ) { |
304 | // Need to create waypoint | |
305 | wp = vik_waypoint_new(); | |
306 | wp->visible = TRUE; | |
307 | } | |
f75d0233 RN |
308 | wp->coord = coord; |
309 | wp->altitude = alt; | |
310 | ||
311 | ExifData *ed = exif_data_new_from_file ( filename ); | |
312 | ||
313 | // Set info from exif values | |
314 | if ( ed ) { | |
315 | wp->comment = geotag_get_exif_comment ( ed ); | |
316 | ||
317 | gchar str[128]; | |
318 | ExifEntry *ee; | |
319 | // Name | |
320 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
321 | if ( ee ) { | |
322 | exif_entry_get_value ( ee, str, 128 ); | |
323 | *name = g_strdup ( str ); | |
324 | } | |
325 | ||
326 | // Finished with EXIF | |
327 | exif_data_free ( ed ); | |
328 | } | |
329 | ||
330 | vik_waypoint_set_image ( wp, filename ); | |
331 | ||
f75d0233 RN |
332 | return wp; |
333 | } | |
b3eb3b98 RN |
334 | |
335 | /** | |
336 | * a_geotag_get_exif_date_from_file: | |
337 | * @filename: The image file to process | |
338 | * @has_GPS_info: Returns whether the file has existing GPS information | |
339 | * | |
340 | * Returns: An allocated string with the date and time in EXIF_DATE_FORMAT, otherwise NULL if some kind of failure | |
341 | * | |
342 | * Here EXIF processing is used to get time information | |
343 | * | |
344 | */ | |
345 | gchar* a_geotag_get_exif_date_from_file ( const gchar *filename, gboolean *has_GPS_info ) | |
346 | { | |
347 | gchar* datetime = NULL; | |
06949e05 | 348 | *has_GPS_info = FALSE; |
b3eb3b98 RN |
349 | |
350 | ExifData *ed = exif_data_new_from_file ( filename ); | |
351 | ||
352 | // Detect EXIF load failure | |
353 | if ( !ed ) | |
354 | return datetime; | |
355 | ||
356 | gchar str[128]; | |
357 | ExifEntry *ee; | |
358 | ||
359 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
360 | if ( ee ) { | |
361 | exif_entry_get_value ( ee, str, 128 ); | |
362 | datetime = g_strdup ( str ); | |
363 | } | |
364 | ||
365 | // Check GPS Info | |
06949e05 | 366 | |
b3eb3b98 RN |
367 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); |
368 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
369 | if ( ee && ee->components == 4 ) | |
370 | *has_GPS_info = TRUE; | |
371 | ||
06949e05 RN |
372 | // Check other basic GPS fields exist too |
373 | // I have encountered some images which have just the EXIF_TAG_GPS_VERSION_ID but nothing else | |
374 | // So to confirm check more EXIF GPS TAGS: | |
375 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
376 | if ( !ee ) | |
377 | *has_GPS_info = FALSE; | |
378 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
379 | if ( !ee ) | |
380 | *has_GPS_info = FALSE; | |
381 | ||
b3eb3b98 RN |
382 | exif_data_free ( ed ); |
383 | ||
384 | return datetime; | |
385 | } | |
386 | ||
387 | ||
388 | /**! If the entry doesn't exist, create it. | |
389 | * Based on exif command line action_create_value function in exif 0.6.20 | |
390 | */ | |
391 | static ExifEntry* my_exif_create_value (ExifData *ed, ExifTag tag, ExifIfd ifd) | |
392 | { | |
393 | ExifEntry *e = exif_content_get_entry (ed->ifd[ifd], tag); | |
394 | if ( !e ) { | |
395 | e = exif_entry_new (); | |
396 | exif_content_add_entry (ed->ifd[ifd], e); | |
397 | ||
398 | exif_entry_initialize (e, tag); | |
399 | ||
400 | // exif_entry_initialize doesn't seem to do much, especially for the GPS tags | |
401 | // so have to setup fields ourselves: | |
402 | e->tag = tag; | |
403 | ||
404 | if ( tag == EXIF_TAG_GPS_VERSION_ID ) { | |
405 | e->format = EXIF_FORMAT_BYTE; | |
406 | e->components = 4; | |
407 | e->size = sizeof (char) * e->components; | |
408 | if ( e->data ) | |
409 | g_free (e->data); | |
410 | e->data = g_malloc (e->size); | |
411 | } | |
412 | if ( tag == EXIF_TAG_GPS_MAP_DATUM || | |
413 | tag == EXIF_TAG_GPS_LATITUDE_REF || tag == EXIF_TAG_GPS_LONGITUDE_REF || | |
414 | tag == EXIF_TAG_GPS_PROCESSING_METHOD ) { | |
415 | e->format = EXIF_FORMAT_ASCII; | |
416 | // NB Allocation is handled later on when the actual string used is known | |
417 | } | |
418 | if ( tag == EXIF_TAG_GPS_LATITUDE || tag == EXIF_TAG_GPS_LONGITUDE ) { | |
419 | e->format = EXIF_FORMAT_RATIONAL; | |
420 | e->components = 3; | |
421 | e->size = sizeof (ExifRational) * e->components; | |
422 | if ( e->data ) | |
423 | g_free (e->data); | |
424 | e->data = g_malloc (e->size); | |
425 | } | |
426 | if ( tag == EXIF_TAG_GPS_ALTITUDE ) { | |
427 | e->format = EXIF_FORMAT_RATIONAL; | |
428 | e->components = 1; | |
429 | e->size = sizeof (ExifRational) * e->components; | |
430 | if ( e->data ) | |
431 | g_free (e->data); | |
432 | e->data = g_malloc (e->size); | |
433 | } | |
434 | if ( tag == EXIF_TAG_GPS_ALTITUDE_REF ) { | |
435 | e->components = 1; | |
436 | e->size = sizeof (char) * e->components; | |
437 | if ( e->data ) | |
438 | g_free (e->data); | |
439 | e->data = g_malloc (e->size); | |
440 | } | |
441 | /* The entry has been added to the IFD, so we can unref it */ | |
442 | //exif_entry_unref(e); | |
443 | // Crashes later on, when saving to jpeg if the above unref is enabled!! | |
444 | // ?Some other malloc problem somewhere? | |
445 | } | |
446 | return e; | |
447 | } | |
448 | ||
449 | /** Heavily based on convert_arg_to_entry from exif command line tool. | |
450 | * But without ExifLog, exitting, use of g_* io functions | |
451 | * and can take a gdouble value instead of a string | |
452 | */ | |
453 | static void convert_to_entry (const char *set_value, gdouble gdvalue, ExifEntry *e, ExifByteOrder o) | |
454 | { | |
455 | unsigned int i, numcomponents; | |
456 | char *value_p = NULL; | |
457 | char *buf = NULL; | |
458 | /* | |
459 | * ASCII strings are handled separately, | |
460 | * since they don't require any conversion. | |
461 | */ | |
462 | if (e->format == EXIF_FORMAT_ASCII || | |
463 | e->tag == EXIF_TAG_USER_COMMENT) { | |
464 | if (e->data) g_free (e->data); | |
465 | e->components = strlen (set_value) + 1; | |
466 | if (e->tag == EXIF_TAG_USER_COMMENT) | |
467 | e->components += 8 - 1; | |
468 | e->size = sizeof (char) * e->components; | |
469 | e->data = g_malloc (e->size); | |
470 | if (!e->data) { | |
471 | g_warning (_("Not enough memory.")); | |
472 | return; | |
473 | } | |
474 | if (e->tag == EXIF_TAG_USER_COMMENT) { | |
475 | /* assume ASCII charset */ | |
476 | /* TODO: get this from the current locale */ | |
477 | memcpy ((char *) e->data, "ASCII\0\0\0", 8); | |
478 | memcpy ((char *) e->data + 8, set_value, | |
479 | strlen (set_value)); | |
480 | } else | |
481 | strcpy ((char *) e->data, set_value); | |
482 | return; | |
483 | } | |
484 | ||
485 | /* | |
486 | * Make sure we can handle this entry | |
487 | */ | |
488 | if ((e->components == 0) && *set_value) { | |
489 | g_warning (_("Setting a value for this tag is unsupported!")); | |
490 | return; | |
491 | } | |
492 | ||
493 | gboolean use_string = (set_value != NULL); | |
494 | if ( use_string ) { | |
495 | /* Copy the string so we can modify it */ | |
496 | buf = g_strdup (set_value); | |
497 | if (!buf) | |
498 | return; | |
499 | value_p = strtok (buf, " "); | |
500 | } | |
501 | ||
502 | numcomponents = e->components; | |
503 | for (i = 0; i < numcomponents; ++i) { | |
504 | unsigned char s; | |
505 | ||
506 | if ( use_string ) { | |
507 | if (!value_p) { | |
508 | g_warning (_("Too few components specified (need %d, found %d)\n"), numcomponents, i); | |
509 | return; | |
510 | } | |
511 | if (!isdigit(*value_p) && (*value_p != '+') && (*value_p != '-')) { | |
512 | g_warning (_("Numeric value expected\n")); | |
513 | return; | |
514 | } | |
515 | } | |
516 | ||
517 | s = exif_format_get_size (e->format); | |
518 | switch (e->format) { | |
519 | case EXIF_FORMAT_ASCII: | |
520 | g_warning (_("This shouldn't happen!")); | |
521 | return; | |
522 | break; | |
523 | case EXIF_FORMAT_SHORT: | |
524 | exif_set_short (e->data + (s * i), o, atoi (value_p)); | |
525 | break; | |
526 | case EXIF_FORMAT_SSHORT: | |
527 | exif_set_sshort (e->data + (s * i), o, atoi (value_p)); | |
528 | break; | |
529 | case EXIF_FORMAT_RATIONAL: { | |
530 | ExifRational er; | |
531 | ||
532 | double val = 0.0 ; | |
533 | if ( use_string && value_p ) | |
534 | val = fabs (atol (value_p)); | |
535 | else | |
536 | val = fabs (gdvalue); | |
537 | ||
538 | if ( i == 0 ) { | |
539 | // One (or first) part rational | |
540 | ||
541 | // Sneak peek into tag as location tags need rounding down to give just the degrees part | |
542 | if ( e->tag == EXIF_TAG_GPS_LATITUDE || e->tag == EXIF_TAG_GPS_LONGITUDE ) { | |
543 | er.numerator = (ExifLong) floor ( val ); | |
544 | er.denominator = 1.0; | |
545 | } | |
546 | else { | |
547 | // I don't see any point in doing anything too complicated here, | |
548 | // such as trying to work out the 'best' denominator | |
549 | // For the moment use KISS principle. | |
550 | // Fix a precision of 1/100 metre as that's more than enough for GPS accuracy especially altitudes! | |
551 | er.denominator = 100.0; | |
552 | er.numerator = (ExifLong) (val * er.denominator); | |
553 | } | |
554 | } | |
555 | ||
556 | // Now for Location 3 part rationals do Mins and Seconds format | |
557 | ||
558 | // Rounded down minutes | |
559 | if ( i == 1 ) { | |
560 | er.denominator = 1.0; | |
561 | er.numerator = (ExifLong) ( (int) floor ( ( val - floor (val) ) * 60.0 ) ); | |
562 | } | |
563 | ||
564 | // Finally seconds | |
565 | if ( i == 2 ) { | |
566 | er.denominator = 100.0; | |
567 | ||
568 | // Fractional minute. | |
569 | double FracPart = ((val - floor(val)) * 60) - (double)(int) floor ( ( val - floor (val) ) * 60.0 ); | |
570 | er.numerator = (ExifLong) ( (int)floor(FracPart * 6000) ); // Convert to seconds. | |
571 | } | |
572 | exif_set_rational (e->data + (s * i), o, er ); | |
573 | break; | |
574 | } | |
575 | case EXIF_FORMAT_LONG: | |
576 | exif_set_long (e->data + (s * i), o, atol (value_p)); | |
577 | break; | |
578 | case EXIF_FORMAT_SLONG: | |
579 | exif_set_slong (e->data + (s * i), o, atol (value_p)); | |
580 | break; | |
581 | case EXIF_FORMAT_BYTE: | |
582 | case EXIF_FORMAT_SBYTE: | |
583 | case EXIF_FORMAT_UNDEFINED: /* treat as byte array */ | |
584 | e->data[s * i] = atoi (value_p); | |
585 | break; | |
586 | case EXIF_FORMAT_FLOAT: | |
587 | case EXIF_FORMAT_DOUBLE: | |
588 | case EXIF_FORMAT_SRATIONAL: | |
589 | default: | |
590 | g_warning (_("Not yet implemented!")); | |
591 | return; | |
592 | } | |
593 | ||
594 | if ( use_string ) | |
595 | value_p = strtok (NULL, " "); | |
596 | ||
597 | } | |
598 | ||
599 | g_free (buf); | |
600 | ||
601 | if ( use_string ) | |
602 | if ( value_p ) | |
603 | g_warning (_("Warning; Too many components specified!")); | |
604 | } | |
605 | ||
606 | /** | |
607 | * a_geotag_write_exif_gps: | |
608 | * @filename: The image file to save information in | |
609 | * @coord: The location | |
610 | * @alt: The elevation | |
611 | * | |
612 | * Returns: A value indicating success: 0, or some other value for failure | |
613 | * | |
614 | */ | |
615 | gint a_geotag_write_exif_gps ( const gchar *filename, VikCoord coord, gdouble alt, gboolean no_change_mtime ) | |
616 | { | |
617 | gint result = 0; // OK so far... | |
618 | ||
619 | // Save mtime for later use | |
620 | struct stat stat_save; | |
621 | if ( no_change_mtime ) | |
622 | stat ( filename, &stat_save ); | |
623 | ||
624 | /* | |
625 | Appears libexif doesn't actually support writing EXIF data directly to files | |
626 | Thus embed command line exif writing method within Viking | |
627 | (for example this is done by Enlightment - http://www.enlightenment.org/ ) | |
628 | This appears to be JPEG only, but is probably 99% of our use case | |
629 | Alternatively consider using libexiv2 and C++... | |
630 | */ | |
631 | ||
632 | // Actual EXIF settings here... | |
633 | JPEGData *jdata; | |
634 | ||
635 | /* Parse the JPEG file. */ | |
636 | jdata = jpeg_data_new (); | |
637 | jpeg_data_load_file (jdata, filename); | |
638 | ||
639 | // Get current values | |
640 | ExifData *ed = exif_data_new_from_file ( filename ); | |
641 | if ( !ed ) | |
642 | ed = exif_data_new (); | |
643 | ||
644 | // Update ExifData with our new settings | |
645 | ExifEntry *ee; | |
646 | // | |
647 | // 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 | |
648 | // (unless of course there is some bug in the setting of the ID, that prevents subsequent tags) | |
649 | // | |
650 | ||
651 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE, EXIF_IFD_GPS); | |
652 | convert_to_entry ( NULL, alt, ee, exif_data_get_byte_order(ed) ); | |
653 | ||
654 | // byte 0 meaning "sea level" or 1 if the value is negative. | |
655 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE_REF, EXIF_IFD_GPS); | |
656 | convert_to_entry ( alt < 0.0 ? "1" : "0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
657 | ||
658 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_PROCESSING_METHOD, EXIF_IFD_GPS); | |
659 | // see http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html | |
660 | convert_to_entry ( "MANUAL", 0.0, ee, exif_data_get_byte_order(ed) ); | |
661 | ||
662 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_MAP_DATUM, EXIF_IFD_GPS); | |
663 | convert_to_entry ( "WGS-84", 0.0, ee, exif_data_get_byte_order(ed) ); | |
664 | ||
665 | struct LatLon ll; | |
666 | vik_coord_to_latlon ( &coord, &ll ); | |
667 | ||
668 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE_REF, EXIF_IFD_GPS); | |
669 | // N or S | |
670 | convert_to_entry ( ll.lat < 0.0 ? "S" : "N", 0.0, ee, exif_data_get_byte_order(ed) ); | |
671 | ||
672 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE, EXIF_IFD_GPS); | |
673 | convert_to_entry ( NULL, ll.lat, ee, exif_data_get_byte_order(ed) ); | |
674 | ||
675 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE_REF, EXIF_IFD_GPS); | |
676 | // E or W | |
677 | convert_to_entry ( ll.lon < 0.0 ? "W" : "E", 0.0, ee, exif_data_get_byte_order(ed) ); | |
678 | ||
679 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE, EXIF_IFD_GPS); | |
680 | convert_to_entry ( NULL, ll.lon, ee, exif_data_get_byte_order(ed) ); | |
681 | ||
682 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_VERSION_ID, EXIF_IFD_GPS); | |
683 | //convert_to_entry ( "2 0 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
684 | convert_to_entry ( "2 2 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
685 | ||
686 | jpeg_data_set_exif_data (jdata, ed); | |
687 | ||
688 | if ( jdata ) { | |
689 | /* Save the modified image. */ | |
690 | result = jpeg_data_save_file (jdata, filename); | |
691 | ||
692 | // Convert result from 1 for success, 0 for failure into our scheme | |
693 | result = !result; | |
694 | ||
695 | jpeg_data_unref (jdata); | |
696 | } | |
697 | else { | |
698 | // Epic fail - file probably not a JPEG | |
699 | result = 2; | |
700 | } | |
701 | ||
702 | if ( no_change_mtime ) { | |
703 | // Restore mtime, using the saved value | |
704 | struct stat stat_tmp; | |
705 | struct utimbuf utb; | |
706 | stat ( filename, &stat_tmp ); | |
707 | utb.actime = stat_tmp.st_atime; | |
708 | utb.modtime = stat_save.st_mtime; | |
709 | utime ( filename, &utb ); | |
710 | } | |
711 | ||
712 | return result; | |
713 | } |