/**
* a_geotag_write_exif_gps:
* @filename: The image file to save information in
* @coord: The location
* @alt: The elevation
*
* Returns: A value indicating success: 0, or some other value for failure
*
*/
gint a_geotag_write_exif_gps ( const gchar *filename, VikCoord coord, gdouble alt, gboolean no_change_mtime )
{
gint result = 0; // OK so far...
// Save mtime for later use
struct stat stat_save;
if ( no_change_mtime )
stat ( filename, &stat_save );
/*
Appears libexif doesn't actually support writing EXIF data directly to files
Thus embed command line exif writing method within Viking
(for example this is done by Enlightment - http://www.enlightenment.org/ )
This appears to be JPEG only, but is probably 99% of our use case
Alternatively consider using libexiv2 and C++...
*/
// Actual EXIF settings here...
JPEGData *jdata;
/* Parse the JPEG file. */
jdata = jpeg_data_new ();
jpeg_data_load_file (jdata, filename);
// Get current values
ExifData *ed = exif_data_new_from_file ( filename );
if ( !ed )
ed = exif_data_new ();
// Update ExifData with our new settings
ExifEntry *ee;
//
// 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
// (unless of course there is some bug in the setting of the ID, that prevents subsequent tags)
//
ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, alt, ee, exif_data_get_byte_order(ed) );
// byte 0 meaning "sea level" or 1 if the value is negative.
ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE_REF, EXIF_IFD_GPS);
convert_to_entry ( alt < 0.0 ? "1" : "0", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_PROCESSING_METHOD, EXIF_IFD_GPS);
// see http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html
convert_to_entry ( "MANUAL", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_MAP_DATUM, EXIF_IFD_GPS);
convert_to_entry ( "WGS-84", 0.0, ee, exif_data_get_byte_order(ed) );
struct LatLon ll;
vik_coord_to_latlon ( &coord, &ll );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE_REF, EXIF_IFD_GPS);
// N or S
convert_to_entry ( ll.lat < 0.0 ? "S" : "N", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, ll.lat, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE_REF, EXIF_IFD_GPS);
// E or W
convert_to_entry ( ll.lon < 0.0 ? "W" : "E", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, ll.lon, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_VERSION_ID, EXIF_IFD_GPS);
//convert_to_entry ( "2 0 0 0", 0.0, ee, exif_data_get_byte_order(ed) );
convert_to_entry ( "2 2 0 0", 0.0, ee, exif_data_get_byte_order(ed) );
jpeg_data_set_exif_data (jdata, ed);
if ( jdata ) {
/* Save the modified image. */
result = jpeg_data_save_file (jdata, filename);
// Convert result from 1 for success, 0 for failure into our scheme
result = !result;
jpeg_data_unref (jdata);
}
else {
// Epic fail - file probably not a JPEG
result = 2;
}
if ( no_change_mtime ) {
// Restore mtime, using the saved value
struct stat stat_tmp;
struct utimbuf utb;
stat ( filename, &stat_tmp );
utb.actime = stat_tmp.st_atime;
utb.modtime = stat_save.st_mtime;
utime ( filename, &utb );
}
return result;
}
/**
* a_geotag_write_exif_gps:
* @filename: The image file to save information in
* @coord: The location
* @alt: The elevation
* @direction: The image direction (if NAN then these direction fields are not written)
* @direction_ref: The image direction value type
*
* Returns: A value indicating success: 0, or some other value for failure
*
*/
gint a_geotag_write_exif_gps ( const gchar *filename, VikCoord coord, gdouble alt,
gdouble direction, VikWaypointImageDirectionRef direction_ref,
gboolean no_change_mtime )
{
gint result = 0; // OK so far...
// Save mtime for later use
struct stat stat_save;
if ( no_change_mtime )
if ( stat ( filename, &stat_save ) != 0 )
g_warning ( "%s couldn't read: %s", __FUNCTION__, filename );
#ifdef HAVE_LIBGEXIV2
GExiv2Metadata *gemd = gexiv2_metadata_new ();
if ( gexiv2_metadata_open_path ( gemd, filename, NULL ) ) {
struct LatLon ll;
vik_coord_to_latlon ( &coord, &ll );
if ( ! gexiv2_metadata_set_gps_info ( gemd, ll.lon, ll.lat, alt ) ) {
result = 1; // Failed
}
else {
if ( !isnan(direction) ) {
gint nom = (gint)round(direction * 10.0);
gboolean set_d = gexiv2_metadata_set_exif_tag_rational ( gemd, EXIF_GPS_IMGDIR, nom, 10 );
if ( !set_d ) result = 1; // Failed
gboolean set_r = gexiv2_metadata_set_tag_string ( gemd, EXIF_GPS_IMGDIR_REF, direction_ref == WP_IMAGE_DIRECTION_REF_TRUE ? "T" : "M" );
if ( !set_r ) result = 1; // Failed
}
// Still OK to save - no fails yet
if ( result == 0 ) {
GError *error = NULL;
if ( ! gexiv2_metadata_save_file ( gemd, filename, &error ) ) {
result = 2;
g_warning ( "Write EXIF failure:%s" , error->message );
g_error_free ( error );
}
}
}
}
metadata_free ( gemd );
#else
#ifdef HAVE_LIBEXIF
/*
Appears libexif doesn't actually support writing EXIF data directly to files
Thus embed command line exif writing method within Viking
(for example this is done by Enlightment - http://www.enlightenment.org/ )
This appears to be JPEG only, but is probably 99% of our use case
Alternatively consider using libexiv2 and C++...
*/
// Actual EXIF settings here...
JPEGData *jdata;
/* Parse the JPEG file. */
jdata = jpeg_data_new ();
jpeg_data_load_file (jdata, filename);
// Get current values
ExifData *ed = exif_data_new_from_file ( filename );
if ( !ed )
ed = exif_data_new ();
// Update ExifData with our new settings
ExifEntry *ee;
//
// 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
// (unless of course there is some bug in the setting of the ID, that prevents subsequent tags)
//
ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, alt, ee, exif_data_get_byte_order(ed) );
// byte 0 meaning "sea level" or 1 if the value is negative.
ee = my_exif_create_value (ed, EXIF_TAG_GPS_ALTITUDE_REF, EXIF_IFD_GPS);
convert_to_entry ( alt < 0.0 ? "1" : "0", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_PROCESSING_METHOD, EXIF_IFD_GPS);
// see http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/GPS.html
convert_to_entry ( "MANUAL", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_MAP_DATUM, EXIF_IFD_GPS);
convert_to_entry ( "WGS-84", 0.0, ee, exif_data_get_byte_order(ed) );
struct LatLon ll;
vik_coord_to_latlon ( &coord, &ll );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE_REF, EXIF_IFD_GPS);
// N or S
convert_to_entry ( ll.lat < 0.0 ? "S" : "N", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LATITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, ll.lat, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE_REF, EXIF_IFD_GPS);
// E or W
convert_to_entry ( ll.lon < 0.0 ? "W" : "E", 0.0, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_LONGITUDE, EXIF_IFD_GPS);
convert_to_entry ( NULL, ll.lon, ee, exif_data_get_byte_order(ed) );
ee = my_exif_create_value (ed, EXIF_TAG_GPS_VERSION_ID, EXIF_IFD_GPS);
//convert_to_entry ( "2 0 0 0", 0.0, ee, exif_data_get_byte_order(ed) );
convert_to_entry ( "2 2 0 0", 0.0, ee, exif_data_get_byte_order(ed) );
jpeg_data_set_exif_data (jdata, ed);
if ( jdata ) {
/* Save the modified image. */
result = jpeg_data_save_file (jdata, filename);
// Convert result from 1 for success, 0 for failure into our scheme
result = !result;
jpeg_data_unref (jdata);
}
else {
// Epic fail - file probably not a JPEG
result = 2;
}
exif_data_free ( ed );
#endif
#endif
if ( no_change_mtime ) {
// Restore mtime, using the saved value
struct stat stat_tmp;
struct utimbuf utb;
(void)stat ( filename, &stat_tmp );
utb.actime = stat_tmp.st_atime;
utb.modtime = stat_save.st_mtime;
// Not security critical, thus potential Time of Check Time of Use race condition is not bad
// coverity[toctou]
if ( g_utime ( filename, &utb ) != 0 )
g_warning ( "%s couldn't set time on: %s", __FUNCTION__, filename );
}
return result;
}
