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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 | * | |
5 | * Copyright (C) 2011, Rob Norris <rw_norris@hotmail.com> | |
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 | |
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 | ||
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> | |
40 | #include <libexif/exif-data.h> | |
41 | #include "libjpeg/jpeg-data.h" | |
42 | ||
43 | /** | |
44 | * Attempt to get a single comment from the various exif fields | |
45 | */ | |
46 | static gchar* geotag_get_exif_comment ( ExifData *ed ) | |
47 | { | |
48 | gchar str[128]; | |
49 | ExifEntry *ee; | |
50 | // | |
51 | // Try various options to create a comment | |
52 | // | |
53 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_IMAGE_DESCRIPTION); | |
54 | if ( ee ) { | |
55 | exif_entry_get_value ( ee, str, 128 ); | |
56 | return g_strdup ( str ); | |
57 | } | |
58 | ||
59 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_COMMENT); | |
60 | if ( ee ) { | |
61 | exif_entry_get_value ( ee, str, 128 ); | |
62 | return g_strdup ( str ); | |
63 | } | |
64 | ||
65 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_SUBJECT); | |
66 | if ( ee ) { | |
67 | exif_entry_get_value ( ee, str, 128 ); | |
68 | return g_strdup ( str ); | |
69 | } | |
70 | ||
71 | // Consider using these for existing GPS info?? | |
72 | //#define EXIF_TAG_GPS_TIME_STAMP 0x0007 | |
73 | //#define EXIF_TAG_GPS_DATE_STAMP 0x001d | |
74 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
75 | if ( ee ) { | |
76 | exif_entry_get_value ( ee, str, 128 ); | |
77 | return g_strdup ( str ); | |
78 | } | |
79 | ||
80 | // Otherwise nothing found | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | /** | |
85 | * Handles 3 part location Rationals | |
86 | * Handles 1 part rational (must specify 0 for the offset) | |
87 | */ | |
88 | static gdouble Rational2Double ( unsigned char *data, int offset, ExifByteOrder order ) | |
89 | { | |
90 | // Explaination from GPS Correlate 'exif-gps.cpp' v 1.6.1 | |
91 | // What we are trying to do here is convert the three rationals: | |
92 | // dd/v mm/v ss/v | |
93 | // To a decimal | |
94 | // dd.dddddd... | |
95 | // dd/v is easy: result = dd/v. | |
96 | // mm/v is harder: | |
97 | // mm | |
98 | // -- / 60 = result. | |
99 | // v | |
100 | // ss/v is sorta easy. | |
101 | // ss | |
102 | // -- / 3600 = result | |
103 | // v | |
104 | // Each part is added to the final number. | |
105 | gdouble ans; | |
106 | ExifRational er; | |
107 | er = exif_get_rational (data, order); | |
108 | ans = (gdouble)er.numerator / (gdouble)er.denominator; | |
109 | if (offset <= 0) | |
110 | return ans; | |
111 | ||
112 | er = exif_get_rational (data+(1*offset), order); | |
113 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 60.0 ); | |
114 | er = exif_get_rational (data+(2*offset), order); | |
115 | ans = ans + ( ( (gdouble)er.numerator / (gdouble)er.denominator ) / 3600.0 ); | |
116 | ||
117 | return ans; | |
118 | } | |
119 | ||
120 | /** | |
121 | * a_geotag_create_waypoint_from_file: | |
122 | * @filename: The image file to process | |
123 | * @vcmode: The current location mode to use in the positioning of Waypoint | |
124 | * @name: Returns a name for the Waypoint (can be NULL) | |
125 | * | |
126 | * Returns: An allocated Waypoint or NULL if Waypoint could not be generated (e.g. no EXIF info) | |
127 | * | |
128 | */ | |
129 | VikWaypoint* a_geotag_create_waypoint_from_file ( const gchar *filename, VikCoordMode vcmode, gchar **name ) | |
130 | { | |
131 | // Default return values (for failures) | |
132 | *name = NULL; | |
133 | VikWaypoint *wp = NULL; | |
134 | ||
135 | // TODO use log? | |
136 | //ExifLog *log = NULL; | |
137 | ||
138 | // open image with libexif | |
139 | ExifData *ed = exif_data_new_from_file ( filename ); | |
140 | ||
141 | // Detect EXIF load failure | |
142 | if ( !ed ) | |
143 | // return with no Waypoint | |
144 | return wp; | |
145 | ||
146 | struct LatLon ll; | |
147 | ||
148 | gchar str[128]; | |
149 | ExifEntry *ee; | |
150 | ||
151 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
152 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
153 | if ( ! ( ee && ee->components == 4 ) ) | |
154 | goto MyReturn; | |
155 | // Could test for these versions explicitly but may have byte order issues... | |
156 | //if ( ! ( ee->data[0] == 2 && ee->data[2] == 0 && ee->data[3] == 0 ) ) | |
157 | // goto MyReturn; | |
158 | ||
159 | // | |
160 | // Lat & Long is necessary to form a waypoint. | |
161 | // | |
162 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
163 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
164 | goto MyReturn; | |
165 | ||
166 | ll.lat = Rational2Double ( ee->data, | |
167 | exif_format_get_size(ee->format), | |
168 | exif_data_get_byte_order(ed) ); | |
169 | ||
170 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE_REF); | |
171 | if ( ee ) { | |
172 | exif_entry_get_value ( ee, str, 128 ); | |
173 | if ( str[0] == 'S' ) | |
174 | ll.lat = -ll.lat; | |
175 | } | |
176 | ||
177 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
178 | if ( ! ( ee && ee->components == 3 && ee->format == EXIF_FORMAT_RATIONAL ) ) | |
179 | goto MyReturn; | |
180 | ||
181 | ll.lon = Rational2Double ( ee->data, | |
182 | exif_format_get_size(ee->format), | |
183 | exif_data_get_byte_order(ed) ); | |
184 | ||
185 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE_REF); | |
186 | if ( ee ) { | |
187 | exif_entry_get_value ( ee, str, 128 ); | |
188 | if ( str[0] == 'W' ) | |
189 | ll.lon = -ll.lon; | |
190 | } | |
191 | ||
192 | // | |
193 | // Not worried if none of the other fields exist, as can default the values to something | |
194 | // | |
195 | ||
196 | gdouble alt = VIK_DEFAULT_ALTITUDE; | |
197 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE); | |
198 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_RATIONAL ) { | |
199 | alt = Rational2Double ( ee->data, | |
200 | 0, | |
201 | exif_data_get_byte_order(ed) ); | |
202 | ||
203 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_ALTITUDE_REF); | |
204 | if ( ee && ee->components == 1 && ee->format == EXIF_FORMAT_BYTE && ee->data[0] == 1 ) | |
205 | alt = -alt; | |
206 | } | |
207 | ||
208 | // Name | |
209 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
210 | if ( ee ) { | |
211 | exif_entry_get_value ( ee, str, 128 ); | |
212 | *name = g_strdup ( str ); | |
213 | } | |
214 | ||
215 | // | |
216 | // Now create Waypoint with acquired information | |
217 | // | |
218 | wp = vik_waypoint_new(); | |
219 | wp->visible = TRUE; | |
220 | // Set info from exif values | |
221 | // Location | |
222 | vik_coord_load_from_latlon ( &(wp->coord), vcmode, &ll ); | |
223 | // Altitude | |
224 | wp->altitude = alt; | |
225 | ||
226 | wp->comment = geotag_get_exif_comment ( ed ); | |
227 | ||
228 | vik_waypoint_set_image ( wp, filename ); | |
229 | ||
230 | MyReturn: | |
231 | // Finished with EXIF | |
232 | exif_data_free ( ed ); | |
233 | ||
234 | return wp; | |
235 | } | |
236 | ||
237 | /** | |
238 | * a_geotag_waypoint_positioned: | |
239 | * @filename: The image file to process | |
240 | * @coord: The location for positioning the Waypoint | |
241 | * @name: Returns a name for the Waypoint (can be NULL) | |
242 | * @waypoint: An existing waypoint to update (can be NULL to generate a new waypoint) | |
243 | * | |
244 | * Returns: An allocated waypoint if the input waypoint is NULL, | |
245 | * otherwise the passed in waypoint is updated | |
246 | * | |
247 | * Here EXIF processing is used to get non position related information (i.e. just the comment) | |
248 | * | |
249 | */ | |
250 | VikWaypoint* a_geotag_waypoint_positioned ( const gchar *filename, VikCoord coord, gdouble alt, gchar **name, VikWaypoint *wp ) | |
251 | { | |
252 | *name = NULL; | |
253 | if ( wp == NULL ) { | |
254 | // Need to create waypoint | |
255 | wp = vik_waypoint_new(); | |
256 | wp->visible = TRUE; | |
257 | } | |
258 | wp->coord = coord; | |
259 | wp->altitude = alt; | |
260 | ||
261 | ExifData *ed = exif_data_new_from_file ( filename ); | |
262 | ||
263 | // Set info from exif values | |
264 | if ( ed ) { | |
265 | wp->comment = geotag_get_exif_comment ( ed ); | |
266 | ||
267 | gchar str[128]; | |
268 | ExifEntry *ee; | |
269 | // Name | |
270 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_0], EXIF_TAG_XP_TITLE); | |
271 | if ( ee ) { | |
272 | exif_entry_get_value ( ee, str, 128 ); | |
273 | *name = g_strdup ( str ); | |
274 | } | |
275 | ||
276 | // Finished with EXIF | |
277 | exif_data_free ( ed ); | |
278 | } | |
279 | ||
280 | vik_waypoint_set_image ( wp, filename ); | |
281 | ||
282 | return wp; | |
283 | } | |
284 | ||
285 | /** | |
286 | * a_geotag_get_exif_date_from_file: | |
287 | * @filename: The image file to process | |
288 | * @has_GPS_info: Returns whether the file has existing GPS information | |
289 | * | |
290 | * Returns: An allocated string with the date and time in EXIF_DATE_FORMAT, otherwise NULL if some kind of failure | |
291 | * | |
292 | * Here EXIF processing is used to get time information | |
293 | * | |
294 | */ | |
295 | gchar* a_geotag_get_exif_date_from_file ( const gchar *filename, gboolean *has_GPS_info ) | |
296 | { | |
297 | gchar* datetime = NULL; | |
298 | *has_GPS_info = FALSE; | |
299 | ||
300 | ExifData *ed = exif_data_new_from_file ( filename ); | |
301 | ||
302 | // Detect EXIF load failure | |
303 | if ( !ed ) | |
304 | return datetime; | |
305 | ||
306 | gchar str[128]; | |
307 | ExifEntry *ee; | |
308 | ||
309 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_EXIF], EXIF_TAG_DATE_TIME_ORIGINAL); | |
310 | if ( ee ) { | |
311 | exif_entry_get_value ( ee, str, 128 ); | |
312 | datetime = g_strdup ( str ); | |
313 | } | |
314 | ||
315 | // Check GPS Info | |
316 | ||
317 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_VERSION_ID); | |
318 | // Confirm this has a GPS Id - normally "2.0.0.0" or "2.2.0.0" | |
319 | if ( ee && ee->components == 4 ) | |
320 | *has_GPS_info = TRUE; | |
321 | ||
322 | // Check other basic GPS fields exist too | |
323 | // I have encountered some images which have just the EXIF_TAG_GPS_VERSION_ID but nothing else | |
324 | // So to confirm check more EXIF GPS TAGS: | |
325 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LATITUDE); | |
326 | if ( !ee ) | |
327 | *has_GPS_info = FALSE; | |
328 | ee = exif_content_get_entry (ed->ifd[EXIF_IFD_GPS], EXIF_TAG_GPS_LONGITUDE); | |
329 | if ( !ee ) | |
330 | *has_GPS_info = FALSE; | |
331 | ||
332 | exif_data_free ( ed ); | |
333 | ||
334 | return datetime; | |
335 | } | |
336 | ||
337 | ||
338 | /**! If the entry doesn't exist, create it. | |
339 | * Based on exif command line action_create_value function in exif 0.6.20 | |
340 | */ | |
341 | static ExifEntry* my_exif_create_value (ExifData *ed, ExifTag tag, ExifIfd ifd) | |
342 | { | |
343 | ExifEntry *e = exif_content_get_entry (ed->ifd[ifd], tag); | |
344 | if ( !e ) { | |
345 | e = exif_entry_new (); | |
346 | exif_content_add_entry (ed->ifd[ifd], e); | |
347 | ||
348 | exif_entry_initialize (e, tag); | |
349 | ||
350 | // exif_entry_initialize doesn't seem to do much, especially for the GPS tags | |
351 | // so have to setup fields ourselves: | |
352 | e->tag = tag; | |
353 | ||
354 | if ( tag == EXIF_TAG_GPS_VERSION_ID ) { | |
355 | e->format = EXIF_FORMAT_BYTE; | |
356 | e->components = 4; | |
357 | e->size = sizeof (char) * e->components; | |
358 | if ( e->data ) | |
359 | g_free (e->data); | |
360 | e->data = g_malloc (e->size); | |
361 | } | |
362 | if ( tag == EXIF_TAG_GPS_MAP_DATUM || | |
363 | tag == EXIF_TAG_GPS_LATITUDE_REF || tag == EXIF_TAG_GPS_LONGITUDE_REF || | |
364 | tag == EXIF_TAG_GPS_PROCESSING_METHOD ) { | |
365 | e->format = EXIF_FORMAT_ASCII; | |
366 | // NB Allocation is handled later on when the actual string used is known | |
367 | } | |
368 | if ( tag == EXIF_TAG_GPS_LATITUDE || tag == EXIF_TAG_GPS_LONGITUDE ) { | |
369 | e->format = EXIF_FORMAT_RATIONAL; | |
370 | e->components = 3; | |
371 | e->size = sizeof (ExifRational) * e->components; | |
372 | if ( e->data ) | |
373 | g_free (e->data); | |
374 | e->data = g_malloc (e->size); | |
375 | } | |
376 | if ( tag == EXIF_TAG_GPS_ALTITUDE ) { | |
377 | e->format = EXIF_FORMAT_RATIONAL; | |
378 | e->components = 1; | |
379 | e->size = sizeof (ExifRational) * e->components; | |
380 | if ( e->data ) | |
381 | g_free (e->data); | |
382 | e->data = g_malloc (e->size); | |
383 | } | |
384 | if ( tag == EXIF_TAG_GPS_ALTITUDE_REF ) { | |
385 | e->components = 1; | |
386 | e->size = sizeof (char) * e->components; | |
387 | if ( e->data ) | |
388 | g_free (e->data); | |
389 | e->data = g_malloc (e->size); | |
390 | } | |
391 | /* The entry has been added to the IFD, so we can unref it */ | |
392 | //exif_entry_unref(e); | |
393 | // Crashes later on, when saving to jpeg if the above unref is enabled!! | |
394 | // ?Some other malloc problem somewhere? | |
395 | } | |
396 | return e; | |
397 | } | |
398 | ||
399 | /** Heavily based on convert_arg_to_entry from exif command line tool. | |
400 | * But without ExifLog, exitting, use of g_* io functions | |
401 | * and can take a gdouble value instead of a string | |
402 | */ | |
403 | static void convert_to_entry (const char *set_value, gdouble gdvalue, ExifEntry *e, ExifByteOrder o) | |
404 | { | |
405 | unsigned int i, numcomponents; | |
406 | char *value_p = NULL; | |
407 | char *buf = NULL; | |
408 | /* | |
409 | * ASCII strings are handled separately, | |
410 | * since they don't require any conversion. | |
411 | */ | |
412 | if (e->format == EXIF_FORMAT_ASCII || | |
413 | e->tag == EXIF_TAG_USER_COMMENT) { | |
414 | if (e->data) g_free (e->data); | |
415 | e->components = strlen (set_value) + 1; | |
416 | if (e->tag == EXIF_TAG_USER_COMMENT) | |
417 | e->components += 8 - 1; | |
418 | e->size = sizeof (char) * e->components; | |
419 | e->data = g_malloc (e->size); | |
420 | if (!e->data) { | |
421 | g_warning (_("Not enough memory.")); | |
422 | return; | |
423 | } | |
424 | if (e->tag == EXIF_TAG_USER_COMMENT) { | |
425 | /* assume ASCII charset */ | |
426 | /* TODO: get this from the current locale */ | |
427 | memcpy ((char *) e->data, "ASCII\0\0\0", 8); | |
428 | memcpy ((char *) e->data + 8, set_value, | |
429 | strlen (set_value)); | |
430 | } else | |
431 | strcpy ((char *) e->data, set_value); | |
432 | return; | |
433 | } | |
434 | ||
435 | /* | |
436 | * Make sure we can handle this entry | |
437 | */ | |
438 | if ((e->components == 0) && *set_value) { | |
439 | g_warning (_("Setting a value for this tag is unsupported!")); | |
440 | return; | |
441 | } | |
442 | ||
443 | gboolean use_string = (set_value != NULL); | |
444 | if ( use_string ) { | |
445 | /* Copy the string so we can modify it */ | |
446 | buf = g_strdup (set_value); | |
447 | if (!buf) | |
448 | return; | |
449 | value_p = strtok (buf, " "); | |
450 | } | |
451 | ||
452 | numcomponents = e->components; | |
453 | for (i = 0; i < numcomponents; ++i) { | |
454 | unsigned char s; | |
455 | ||
456 | if ( use_string ) { | |
457 | if (!value_p) { | |
458 | g_warning (_("Too few components specified (need %d, found %d)\n"), numcomponents, i); | |
459 | return; | |
460 | } | |
461 | if (!isdigit(*value_p) && (*value_p != '+') && (*value_p != '-')) { | |
462 | g_warning (_("Numeric value expected\n")); | |
463 | return; | |
464 | } | |
465 | } | |
466 | ||
467 | s = exif_format_get_size (e->format); | |
468 | switch (e->format) { | |
469 | case EXIF_FORMAT_ASCII: | |
470 | g_warning (_("This shouldn't happen!")); | |
471 | return; | |
472 | break; | |
473 | case EXIF_FORMAT_SHORT: | |
474 | exif_set_short (e->data + (s * i), o, atoi (value_p)); | |
475 | break; | |
476 | case EXIF_FORMAT_SSHORT: | |
477 | exif_set_sshort (e->data + (s * i), o, atoi (value_p)); | |
478 | break; | |
479 | case EXIF_FORMAT_RATIONAL: { | |
480 | ExifRational er; | |
481 | ||
482 | double val = 0.0 ; | |
483 | if ( use_string && value_p ) | |
484 | val = fabs (atol (value_p)); | |
485 | else | |
486 | val = fabs (gdvalue); | |
487 | ||
488 | if ( i == 0 ) { | |
489 | // One (or first) part rational | |
490 | ||
491 | // Sneak peek into tag as location tags need rounding down to give just the degrees part | |
492 | if ( e->tag == EXIF_TAG_GPS_LATITUDE || e->tag == EXIF_TAG_GPS_LONGITUDE ) { | |
493 | er.numerator = (ExifLong) floor ( val ); | |
494 | er.denominator = 1.0; | |
495 | } | |
496 | else { | |
497 | // I don't see any point in doing anything too complicated here, | |
498 | // such as trying to work out the 'best' denominator | |
499 | // For the moment use KISS principle. | |
500 | // Fix a precision of 1/100 metre as that's more than enough for GPS accuracy especially altitudes! | |
501 | er.denominator = 100.0; | |
502 | er.numerator = (ExifLong) (val * er.denominator); | |
503 | } | |
504 | } | |
505 | ||
506 | // Now for Location 3 part rationals do Mins and Seconds format | |
507 | ||
508 | // Rounded down minutes | |
509 | if ( i == 1 ) { | |
510 | er.denominator = 1.0; | |
511 | er.numerator = (ExifLong) ( (int) floor ( ( val - floor (val) ) * 60.0 ) ); | |
512 | } | |
513 | ||
514 | // Finally seconds | |
515 | if ( i == 2 ) { | |
516 | er.denominator = 100.0; | |
517 | ||
518 | // Fractional minute. | |
519 | double FracPart = ((val - floor(val)) * 60) - (double)(int) floor ( ( val - floor (val) ) * 60.0 ); | |
520 | er.numerator = (ExifLong) ( (int)floor(FracPart * 6000) ); // Convert to seconds. | |
521 | } | |
522 | exif_set_rational (e->data + (s * i), o, er ); | |
523 | break; | |
524 | } | |
525 | case EXIF_FORMAT_LONG: | |
526 | exif_set_long (e->data + (s * i), o, atol (value_p)); | |
527 | break; | |
528 | case EXIF_FORMAT_SLONG: | |
529 | exif_set_slong (e->data + (s * i), o, atol (value_p)); | |
530 | break; | |
531 | case EXIF_FORMAT_BYTE: | |
532 | case EXIF_FORMAT_SBYTE: | |
533 | case EXIF_FORMAT_UNDEFINED: /* treat as byte array */ | |
534 | e->data[s * i] = atoi (value_p); | |
535 | break; | |
536 | case EXIF_FORMAT_FLOAT: | |
537 | case EXIF_FORMAT_DOUBLE: | |
538 | case EXIF_FORMAT_SRATIONAL: | |
539 | default: | |
540 | g_warning (_("Not yet implemented!")); | |
541 | return; | |
542 | } | |
543 | ||
544 | if ( use_string ) | |
545 | value_p = strtok (NULL, " "); | |
546 | ||
547 | } | |
548 | ||
549 | g_free (buf); | |
550 | ||
551 | if ( use_string ) | |
552 | if ( value_p ) | |
553 | g_warning (_("Warning; Too many components specified!")); | |
554 | } | |
555 | ||
556 | /** | |
557 | * a_geotag_write_exif_gps: | |
558 | * @filename: The image file to save information in | |
559 | * @coord: The location | |
560 | * @alt: The elevation | |
561 | * | |
562 | * Returns: A value indicating success: 0, or some other value for failure | |
563 | * | |
564 | */ | |
565 | gint a_geotag_write_exif_gps ( const gchar *filename, VikCoord coord, gdouble alt, gboolean no_change_mtime ) | |
566 | { | |
567 | gint result = 0; // OK so far... | |
568 | ||
569 | // Save mtime for later use | |
570 | struct stat stat_save; | |
571 | if ( no_change_mtime ) | |
572 | stat ( filename, &stat_save ); | |
573 | ||
574 | /* | |
575 | Appears libexif doesn't actually support writing EXIF data directly to files | |
576 | Thus embed command line exif writing method within Viking | |
577 | (for example this is done by Enlightment - http://www.enlightenment.org/ ) | |
578 | This appears to be JPEG only, but is probably 99% of our use case | |
579 | Alternatively consider using libexiv2 and C++... | |
580 | */ | |
581 | ||
582 | // Actual EXIF settings here... | |
583 | JPEGData *jdata; | |
584 | ||
585 | /* Parse the JPEG file. */ | |
586 | jdata = jpeg_data_new (); | |
587 | jpeg_data_load_file (jdata, filename); | |
588 | ||
589 | // Get current values | |
590 | ExifData *ed = exif_data_new_from_file ( filename ); | |
591 | if ( !ed ) | |
592 | ed = exif_data_new (); | |
593 | ||
594 | // Update ExifData with our new settings | |
595 | ExifEntry *ee; | |
596 | // | |
597 | // 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 | |
598 | // (unless of course there is some bug in the setting of the ID, that prevents subsequent tags) | |
599 | // | |
600 | ||
601 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE, EXIF_IFD_GPS); | |
602 | convert_to_entry ( NULL, alt, ee, exif_data_get_byte_order(ed) ); | |
603 | ||
604 | // byte 0 meaning "sea level" or 1 if the value is negative. | |
605 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE_REF, EXIF_IFD_GPS); | |
606 | convert_to_entry ( alt < 0.0 ? "1" : "0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
607 | ||
608 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_PROCESSING_METHOD, EXIF_IFD_GPS); | |
609 | // see http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html | |
610 | convert_to_entry ( "MANUAL", 0.0, ee, exif_data_get_byte_order(ed) ); | |
611 | ||
612 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_MAP_DATUM, EXIF_IFD_GPS); | |
613 | convert_to_entry ( "WGS-84", 0.0, ee, exif_data_get_byte_order(ed) ); | |
614 | ||
615 | struct LatLon ll; | |
616 | vik_coord_to_latlon ( &coord, &ll ); | |
617 | ||
618 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE_REF, EXIF_IFD_GPS); | |
619 | // N or S | |
620 | convert_to_entry ( ll.lat < 0.0 ? "S" : "N", 0.0, ee, exif_data_get_byte_order(ed) ); | |
621 | ||
622 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE, EXIF_IFD_GPS); | |
623 | convert_to_entry ( NULL, ll.lat, ee, exif_data_get_byte_order(ed) ); | |
624 | ||
625 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE_REF, EXIF_IFD_GPS); | |
626 | // E or W | |
627 | convert_to_entry ( ll.lon < 0.0 ? "W" : "E", 0.0, ee, exif_data_get_byte_order(ed) ); | |
628 | ||
629 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE, EXIF_IFD_GPS); | |
630 | convert_to_entry ( NULL, ll.lon, ee, exif_data_get_byte_order(ed) ); | |
631 | ||
632 | ee = my_exif_create_value (ed, EXIF_TAG_GPS_VERSION_ID, EXIF_IFD_GPS); | |
633 | //convert_to_entry ( "2 0 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
634 | convert_to_entry ( "2 2 0 0", 0.0, ee, exif_data_get_byte_order(ed) ); | |
635 | ||
636 | jpeg_data_set_exif_data (jdata, ed); | |
637 | ||
638 | if ( jdata ) { | |
639 | /* Save the modified image. */ | |
640 | result = jpeg_data_save_file (jdata, filename); | |
641 | ||
642 | // Convert result from 1 for success, 0 for failure into our scheme | |
643 | result = !result; | |
644 | ||
645 | jpeg_data_unref (jdata); | |
646 | } | |
647 | else { | |
648 | // Epic fail - file probably not a JPEG | |
649 | result = 2; | |
650 | } | |
651 | ||
652 | if ( no_change_mtime ) { | |
653 | // Restore mtime, using the saved value | |
654 | struct stat stat_tmp; | |
655 | struct utimbuf utb; | |
656 | stat ( filename, &stat_tmp ); | |
657 | utb.actime = stat_tmp.st_atime; | |
658 | utb.modtime = stat_save.st_mtime; | |
659 | utime ( filename, &utb ); | |
660 | } | |
661 | ||
662 | return result; | |
663 | } |