src/exif-common.c

   1 /*
   2  * Geeqie
   3  * (C) 2006 John Ellis
   4  * Copyright (C) 2008 The Geeqie Team
   5  *
   6 */
   7
   8 #ifdef HAVE_CONFIG_H
   9 #  include "config.h"
  10 #endif
  11
  12 #include <stdio.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <unistd.h>
  16 #include <sys/types.h>
  17 #include <sys/stat.h>
  18 #include <sys/mman.h>
  19 #include <math.h>
  20
  21 #ifdef HAVE_LCMS
  22 /*** color support enabled ***/
  23
  24 #ifdef HAVE_LCMS_LCMS_H
  25   #include <lcms/lcms.h>
  26 #else
  27   #include <lcms.h>
  28 #endif
  29 #endif
  30
  31 #include <glib.h>
  32
  33 #include "intl.h"
  34
  35 #include "main.h"
  36 #include "exif.h"
  37
  38 #include "debug.h"
  39 #include "filelist.h"
  40 #include "format_raw.h"
  41 #include "ui_fileops.h"
  42
  43
  44 /* human readable key list */
  45
  46 ExifFormattedText ExifFormattedList[] = {
  47         { "fCamera",            N_("Camera") },
  48         { "fDateTime",          N_("Date") },
  49         { "fShutterSpeed",      N_("Shutter speed") },
  50         { "fAperture",          N_("Aperture") },
  51         { "fExposureBias",      N_("Exposure bias") },
  52         { "fISOSpeedRating",    N_("ISO sensitivity") },
  53         { "fFocalLength",       N_("Focal length") },
  54         { "fFocalLength35mmFilm",N_("Focal length 35mm") },
  55         { "fSubjectDistance",   N_("Subject distance") },
  56         { "fFlash",             N_("Flash") },
  57         { "fResolution",        N_("Resolution") },
  58         { "fColorProfile",      N_("Color profile") },
  59         { NULL, NULL }
  60 };
  61
  62 double exif_rational_to_double(ExifRational *r, gint sign)
  63 {
  64         if (!r || r->den == 0.0) return 0.0;
  65
  66         if (sign) return (double)((int)r->num) / (double)((int)r->den);
  67         return (double)r->num / r->den;
  68 }
  69
  70 double exif_get_rational_as_double(ExifData *exif, const gchar *key)
  71 {
  72         ExifRational *r;
  73         gint sign;
  74
  75         r = exif_get_rational(exif, key, &sign);
  76         return exif_rational_to_double(r, sign);
  77 }
  78
  79 static GString *append_comma_text(GString *string, const gchar *text)
  80 {
  81         string = g_string_append(string, ", ");
  82         string = g_string_append(string, text);
  83
  84         return string;
  85 }
  86
  87 static gchar *remove_common_prefix(gchar *s, gchar *t)
  88 {
  89         gint i;
  90
  91         if (!s || !t) return t;
  92
  93         for (i = 0; s[i] && t[i] && s[i] == t[i]; i++)
  94                 ;
  95         if (!i)
  96                 return t;
  97         if (s[i-1] == ' ' || !s[i])
  98                 {
  99                 while (t[i] == ' ')
 100                         i++;
 101                 return t + i;
 102                 }
 103         return s;
 104 }
 105
 106 static double get_crop_factor(ExifData *exif)
 107 {
 108         double res_unit_tbl[] = {0.0, 25.4, 25.4, 10.0, 1.0, 0.001 };
 109
 110         double xres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneXResolution");
 111         double yres = exif_get_rational_as_double(exif, "Exif.Photo.FocalPlaneYResolution");
 112         int res_unit;
 113         int w, h;
 114         double xsize, ysize, size, ratio;
 115
 116         if (xres == 0.0 || yres == 0.0) return 0.0;
 117
 118         if (!exif_get_integer(exif, "Exif.Photo.FocalPlaneResolutionUnit", &res_unit)) return 0.0;
 119         if (res_unit < 1 || res_unit > 5) return 0.0;
 120
 121         if (!exif_get_integer(exif, "Exif.Photo.PixelXDimension", &w)) return 0.0;
 122         if (!exif_get_integer(exif, "Exif.Photo.PixelYDimension", &h)) return 0.0;
 123
 124         xsize = w * res_unit_tbl[res_unit] / xres;
 125         ysize = h * res_unit_tbl[res_unit] / yres;
 126
 127         ratio = xsize / ysize;
 128
 129         if (ratio < 0.5 || ratio > 2.0) return 0.0; /* reasonable ratio */
 130
 131         size = sqrt(xsize * xsize + ysize * ysize);
 132
 133         if (size < 1.0 || size > 100.0) return 0.0; /* reasonable sensor size in mm */
 134
 135         return sqrt(36*36+24*24) / size;
 136
 137 }
 138
 139 static gint remove_suffix(gchar *str, const gchar *suffix, gint suffix_len)
 140 {
 141         gint str_len = strlen(str);
 142
 143         if (suffix_len < 0) suffix_len = strlen(suffix);
 144         if (str_len < suffix_len) return FALSE;
 145
 146         if (strcmp(str + str_len - suffix_len, suffix) != 0) return FALSE;
 147         str[str_len - suffix_len] = '\0';
 148
 149         return TRUE;
 150 }
 151
 152 gchar *exif_get_formatted_by_key(ExifData *exif, const gchar *key, gint *key_valid)
 153 {
 154         /* must begin with f, else not formatted */
 155         if (key[0] != 'f')
 156                 {
 157                 if (key_valid) *key_valid = FALSE;
 158                 return NULL;
 159                 }
 160
 161         if (key_valid) *key_valid = TRUE;
 162
 163         if (strcmp(key, "fCamera") == 0)
 164                 {
 165                 gchar *text;
 166                 gchar *make = exif_get_data_as_text(exif, "Exif.Image.Make");
 167                 gchar *model = exif_get_data_as_text(exif, "Exif.Image.Model");
 168                 gchar *software = exif_get_data_as_text(exif, "Exif.Image.Software");
 169                 gchar *model2;
 170                 gchar *software2;
 171
 172                 if (make)
 173                         {
 174                         g_strstrip(make);
 175
 176                         if (remove_suffix(make, " CORPORATION", 12)) { /* Nikon */ }
 177                         else if (remove_suffix(make, " Corporation", 12)) { /* Pentax */ }
 178                         else if (remove_suffix(make, " OPTICAL CO.,LTD", 16)) { /* OLYMPUS */ };
 179                         }
 180
 181                 if (model)
 182                         g_strstrip(model);
 183
 184                 if (software)
 185                         {
 186                         gint i;
 187
 188                         g_strstrip(software);
 189
 190                         /* remove superfluous spaces (pentax K100D) */
 191                         for (i = 0; software[i]; i++)
 192                                 if (software[i] == ' ' && software[i + 1] == ' ')
 193                                         {
 194                                         gint j;
 195
 196                                         for (j = 1; software[i + j] == ' '; j++);
 197                                         memmove(software + i + 1, software + i + j, strlen(software + i + j) + 1);
 198                                         }
 199                         }
 200
 201                 model2 = remove_common_prefix(make, model);
 202                 software2 = remove_common_prefix(model2, software);
 203
 204                 text = g_strdup_printf("%s%s%s%s%s%s", (make) ? make : "", (make && model2) ? " " : "",
 205                                                        (model2) ? model2 : "",
 206                                                        (software2 && (make || model2)) ? " (" : "",
 207                                                        (software2) ? software2 : "",
 208                                                        (software2 && (make || model2)) ? ")" : "");
 209
 210                 g_free(make);
 211                 g_free(model);
 212                 g_free(software);
 213                 return text;
 214                 }
 215         if (strcmp(key, "fDateTime") == 0)
 216                 {
 217                 gchar *text = exif_get_data_as_text(exif, "Exif.Photo.DateTimeOriginal");
 218                 gchar *subsec = NULL;
 219                 if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTimeOriginal");
 220                 if (!text)
 221                         {
 222                         text = exif_get_data_as_text(exif, "Exif.Image.DateTime");
 223                         if (text) subsec = exif_get_data_as_text(exif, "Exif.Photo.SubSecTime");
 224                         }
 225                 if (subsec)
 226                         {
 227                         gchar *tmp = text;
 228                         text = g_strconcat(tmp, ".", subsec, NULL);
 229                         g_free(tmp);
 230                         g_free(subsec);
 231                         }
 232                 return text;
 233                 }
 234         if (strcmp(key, "fShutterSpeed") == 0)
 235                 {
 236                 ExifRational *r;
 237
 238                 r = exif_get_rational(exif, "Exif.Photo.ExposureTime", NULL);
 239                 if (r && r->num && r->den)
 240                         {
 241                         double n = (double)r->den / (double)r->num;
 242                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 243                                                           n > 1.0 ? n : 1.0 / n);
 244                         }
 245                 r = exif_get_rational(exif, "Exif.Photo.ShutterSpeedValue", NULL);
 246                 if (r && r->num  && r->den)
 247                         {
 248                         double n = pow(2.0, exif_rational_to_double(r, TRUE));
 249
 250                         /* Correct exposure time to avoid values like 1/91s (seen on Minolta DImage 7) */
 251                         if (n > 1.0 && (int)n - ((int)(n/10))*10 == 1) n--;
 252
 253                         return g_strdup_printf("%s%.0fs", n > 1.0 ? "1/" : "",
 254                                                           n > 1.0 ? floor(n) : 1.0 / n);
 255                         }
 256                 return NULL;
 257                 }
 258         if (strcmp(key, "fAperture") == 0)
 259                 {
 260                 double n;
 261
 262                 n = exif_get_rational_as_double(exif, "Exif.Photo.FNumber");
 263                 if (n == 0.0) n = exif_get_rational_as_double(exif, "Exif.Photo.ApertureValue");
 264                 if (n == 0.0) return NULL;
 265
 266                 return g_strdup_printf("f/%.1f", n);
 267                 }
 268         if (strcmp(key, "fExposureBias") == 0)
 269                 {
 270                 ExifRational *r;
 271                 gint sign;
 272                 double n;
 273
 274                 r = exif_get_rational(exif, "Exif.Photo.ExposureBiasValue", &sign);
 275                 if (!r) return NULL;
 276
 277                 n = exif_rational_to_double(r, sign);
 278                 return g_strdup_printf("%+.1f", n);
 279                 }
 280         if (strcmp(key, "fFocalLength") == 0)
 281                 {
 282                 double n;
 283
 284                 n = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 285                 if (n == 0.0) return NULL;
 286                 return g_strdup_printf("%.0f mm", n);
 287                 }
 288         if (strcmp(key, "fFocalLength35mmFilm") == 0)
 289                 {
 290                 gint n;
 291                 double f, c;
 292
 293                 if (exif_get_integer(exif, "Exif.Photo.FocalLengthIn35mmFilm", &n) && n != 0)
 294                         {
 295                         return g_strdup_printf("%d mm", n);
 296                         }
 297
 298                 f = exif_get_rational_as_double(exif, "Exif.Photo.FocalLength");
 299                 c = get_crop_factor(exif);
 300
 301                 if (f != 0.0 && c != 0.0)
 302                         {
 303                         return g_strdup_printf("%.0f mm", f * c);
 304                         }
 305
 306                 return NULL;
 307                 }
 308         if (strcmp(key, "fISOSpeedRating") == 0)
 309                 {
 310                 gchar *text;
 311
 312                 text = exif_get_data_as_text(exif, "Exif.Photo.ISOSpeedRatings");
 313                 /* kodak may set this instead */
 314                 if (!text) text = exif_get_data_as_text(exif, "Exif.Photo.ExposureIndex");
 315                 return text;
 316                 }
 317         if (strcmp(key, "fSubjectDistance") == 0)
 318                 {
 319                 ExifRational *r;
 320                 gint sign;
 321                 double n;
 322
 323                 r = exif_get_rational(exif, "Exif.Photo.SubjectDistance", &sign);
 324                 if (!r) return NULL;
 325
 326                 if ((long)r->num == 0xffffffff) return g_strdup(_("infinity"));
 327                 if ((long)r->num == 0) return g_strdup(_("unknown"));
 328
 329                 n = exif_rational_to_double(r, sign);
 330                 if (n == 0.0) return _("unknown");
 331                 return g_strdup_printf("%.3f m", n);
 332                 }
 333         if (strcmp(key, "fFlash") == 0)
 334                 {
 335                 /* grr, flash is a bitmask... */
 336                 GString *string;
 337                 gchar *text;
 338                 gint n;
 339                 gint v;
 340
 341                 if (!exif_get_integer(exif, "Exif.Photo.Flash", &n)) return NULL;
 342
 343                 /* Exif 2.1 only defines first 3 bits */
 344                 if (n <= 0x07) return exif_get_data_as_text(exif, "Exif.Photo.Flash");
 345
 346                 /* must be Exif 2.2 */
 347                 string = g_string_new("");
 348
 349                 /* flash fired (bit 0) */
 350                 string = g_string_append(string, (n & 0x01) ? _("yes") : _("no"));
 351
 352                 /* flash mode (bits 3, 4) */
 353                 v = (n >> 3) & 0x03;
 354                 if (v) string = append_comma_text(string, _("mode:"));
 355                 switch (v)
 356                         {
 357                         case 1:
 358                                 string = g_string_append(string, _("on"));
 359                                 break;
 360                         case 2:
 361                                 string = g_string_append(string, _("off"));
 362                                 break;
 363                         case 3:
 364                                 string = g_string_append(string, _("auto"));
 365                                 break;
 366                         }
 367
 368                 /* return light (bits 1, 2) */
 369                 v = (n >> 1) & 0x03;
 370                 if (v == 2) string = append_comma_text(string, _("not detected by strobe"));
 371                 if (v == 3) string = append_comma_text(string, _("detected by strobe"));
 372
 373                 /* we ignore flash function (bit 5) */
 374
 375                 /* red-eye (bit 6) */
 376                 if ((n >> 5) & 0x01) string = append_comma_text(string, _("red-eye reduction"));
 377
 378                 text = string->str;
 379                 g_string_free(string, FALSE);
 380                 return text;
 381                 }
 382         if (strcmp(key, "fResolution") == 0)
 383                 {
 384                 ExifRational *rx, *ry;
 385                 gchar *units;
 386                 gchar *text;
 387
 388                 rx = exif_get_rational(exif, "Exif.Image.XResolution", NULL);
 389                 ry = exif_get_rational(exif, "Exif.Image.YResolution", NULL);
 390                 if (!rx || !ry) return NULL;
 391
 392                 units = exif_get_data_as_text(exif, "Exif.Image.ResolutionUnit");
 393                 text = g_strdup_printf("%0.f x %0.f (%s/%s)", rx->den ? (double)rx->num / rx->den : 1.0,
 394                                                               ry->den ? (double)ry->num / ry->den : 1.0,
 395                                                               _("dot"), (units) ? units : _("unknown"));
 396
 397                 g_free(units);
 398                 return text;
 399                 }
 400         if (strcmp(key, "fColorProfile") == 0)
 401                 {
 402                 const gchar *name = "";
 403                 const gchar *source = "";
 404                 unsigned char *profile_data;
 405                 guint profile_len;
 406                 profile_data = exif_get_color_profile(exif, &profile_len);
 407                 if (!profile_data)
 408                         {
 409                         gint cs;
 410                         gchar *interop_index;
 411
 412                         /* ColorSpace == 1 specifies sRGB per EXIF 2.2 */
 413                         if (!exif_get_integer(exif, "Exif.Photo.ColorSpace", &cs)) cs = 0;
 414                         interop_index = exif_get_data_as_text(exif, "Exif.Iop.InteroperabilityIndex");
 415
 416                         if (cs == 1)
 417                                 {
 418                                 name = _("sRGB");
 419                                 source = "ColorSpace";
 420                                 }
 421                         else if (cs == 2 || (interop_index && !strcmp(interop_index, "R03")))
 422                                 {
 423                                 name = _("AdobeRGB");
 424                                 source = (cs == 2) ? "ColorSpace" : "Iop";
 425                                 }
 426
 427                         g_free(interop_index);
 428                         }
 429                 else
 430                         {
 431                         source = _("embedded");
 432 #ifdef HAVE_LCMS
 433
 434                                 {
 435                                 cmsHPROFILE profile;
 436
 437                                 profile = cmsOpenProfileFromMem(profile_data, profile_len);
 438                                 if (profile)
 439                                         {
 440                                         name = cmsTakeProductName(profile);
 441                                         cmsCloseProfile(profile);
 442                                         }
 443                                 g_free(profile_data);
 444                                 }
 445 #endif
 446                         }
 447                 if (name[0] == 0 && source[0] == 0) return NULL;
 448                 return g_strdup_printf("%s (%s)", name, source);
 449                 }
 450
 451         if (key_valid) *key_valid = FALSE;
 452         return NULL;
 453 }
 454
 455 const gchar *exif_get_description_by_key(const gchar *key)
 456 {
 457         gint i;
 458
 459         if (!key) return NULL;
 460
 461         i = 0;
 462         while (ExifFormattedList[i].key != NULL)
 463                 {
 464                 if (strcmp(key, ExifFormattedList[i].key) == 0) return _(ExifFormattedList[i].description);
 465                 i++;
 466                 }
 467
 468         return exif_get_tag_description_by_key(key);
 469 }
 470
 471 gint exif_get_integer(ExifData *exif, const gchar *key, gint *value)
 472 {
 473         ExifItem *item;
 474
 475         item = exif_get_item(exif, key);
 476         return exif_item_get_integer(item, value);
 477 }
 478
 479 ExifRational *exif_get_rational(ExifData *exif, const gchar *key, gint *sign)
 480 {
 481         ExifItem *item;
 482
 483         item = exif_get_item(exif, key);
 484         return exif_item_get_rational(item, sign);
 485 }
 486
 487 gchar *exif_get_data_as_text(ExifData *exif, const gchar *key)
 488 {
 489         ExifItem *item;
 490         gchar *text;
 491         gint key_valid;
 492
 493         if (!key) return NULL;
 494
 495         text = exif_get_formatted_by_key(exif, key, &key_valid);
 496         if (key_valid) return text;
 497
 498         item = exif_get_item(exif, key);
 499         if (item) return exif_item_get_data_as_text(item);
 500
 501         return NULL;
 502 }
 503
 504 ExifData *exif_read_fd(FileData *fd)
 505 {
 506         GList *work;
 507         gchar *sidecar_path = NULL;
 508
 509         if (!fd) return NULL;
 510
 511         work = fd->parent ? fd->parent->sidecar_files : fd->sidecar_files;
 512
 513         if (filter_file_class(fd->extension, FORMAT_CLASS_RAWIMAGE))
 514                 {
 515                 while (work)
 516                         {
 517                         FileData *sfd = work->data;
 518                         work = work->next;
 519                         if (strcasecmp(sfd->extension, ".xmp") == 0)
 520                                 {
 521                                 sidecar_path = sfd->path;
 522                                 break;
 523                                 }
 524                         }
 525                 }
 526
 527
 528         // FIXME: some caching would be nice
 529         return exif_read(fd->path, sidecar_path);
 530 }
 531
 532
 533
 534 /* embedded icc in jpeg */
 535
 536
 537 #define JPEG_MARKER             0xFF
 538 #define JPEG_MARKER_SOI         0xD8
 539 #define JPEG_MARKER_EOI         0xD9
 540 #define JPEG_MARKER_APP1        0xE1
 541 #define JPEG_MARKER_APP2        0xE2
 542
 543 /* jpeg container format:
 544      all data markers start with 0XFF
 545      2 byte long file start and end markers: 0xFFD8(SOI) and 0XFFD9(EOI)
 546      4 byte long data segment markers in format: 0xFFTTSSSSNNN...
 547        FF:   1 byte standard marker identifier
 548        TT:   1 byte data type
 549        SSSS: 2 bytes in Motorola byte alignment for length of the data.
 550              This value includes these 2 bytes in the count, making actual
 551              length of NN... == SSSS - 2.
 552        NNN.: the data in this segment
 553  */
 554
 555 gint exif_jpeg_segment_find(unsigned char *data, guint size,
 556                                    guchar app_marker, const gchar *magic, guint magic_len,
 557                                    guint *seg_offset, guint *seg_length)
 558 {
 559         guchar marker = 0;
 560         guint offset = 0;
 561         guint length = 0;
 562
 563         while (marker != app_marker &&
 564                marker != JPEG_MARKER_EOI)
 565                 {
 566                 offset += length;
 567                 length = 2;
 568
 569                 if (offset + 2 >= size ||
 570                     data[offset] != JPEG_MARKER) return FALSE;
 571
 572                 marker = data[offset + 1];
 573                 if (marker != JPEG_MARKER_SOI &&
 574                     marker != JPEG_MARKER_EOI)
 575                         {
 576                         if (offset + 4 >= size) return FALSE;
 577                         length += ((guint)data[offset + 2] << 8) + data[offset + 3];
 578                         }
 579                 }
 580
 581         if (marker == app_marker &&
 582             offset + length < size &&
 583             length >= 4 + magic_len &&
 584             memcmp(data + offset + 4, magic, magic_len) == 0)
 585                 {
 586                 *seg_offset = offset + 4;
 587                 *seg_length = length - 4;
 588                 return TRUE;
 589                 }
 590
 591         return FALSE;
 592 }
 593
 594 gint exif_jpeg_parse_color(ExifData *exif, unsigned char *data, guint size)
 595 {
 596         guint seg_offset = 0;
 597         guint seg_length = 0;
 598         guint chunk_offset[255];
 599         guint chunk_length[255];
 600         guint chunk_count = 0;
 601
 602         /* For jpeg/jfif, ICC color profile data can be in more than one segment.
 603            the data is in APP2 data segments that start with "ICC_PROFILE\x00\xNN\xTT"
 604            NN = segment number for data
 605            TT = total number of ICC segments (TT in each ICC segment should match)
 606          */
 607
 608         while (exif_jpeg_segment_find(data + seg_offset + seg_length,
 609                                       size - seg_offset - seg_length,
 610                                       JPEG_MARKER_APP2,
 611                                       "ICC_PROFILE\x00", 12,
 612                                       &seg_offset, &seg_length))
 613                 {
 614                 guchar chunk_num;
 615                 guchar chunk_tot;
 616
 617                 if (seg_length < 14) return FALSE;
 618
 619                 chunk_num = data[seg_offset + 12];
 620                 chunk_tot = data[seg_offset + 13];
 621
 622                 if (chunk_num == 0 || chunk_tot == 0) return FALSE;
 623
 624                 if (chunk_count == 0)
 625                         {
 626                         guint i;
 627
 628                         chunk_count = (guint)chunk_tot;
 629                         for (i = 0; i < chunk_count; i++) chunk_offset[i] = 0;
 630                         for (i = 0; i < chunk_count; i++) chunk_length[i] = 0;
 631                         }
 632
 633                 if (chunk_tot != chunk_count ||
 634                     chunk_num > chunk_count) return FALSE;
 635
 636                 chunk_num--;
 637                 chunk_offset[chunk_num] = seg_offset + 14;
 638                 chunk_length[chunk_num] = seg_length - 14;
 639                 }
 640
 641         if (chunk_count > 0)
 642                 {
 643                 unsigned char *cp_data;
 644                 guint cp_length = 0;
 645                 guint i;
 646
 647                 for (i = 0; i < chunk_count; i++) cp_length += chunk_length[i];
 648                 cp_data = g_malloc(cp_length);
 649
 650                 for (i = 0; i < chunk_count; i++)
 651                         {
 652                         if (chunk_offset[i] == 0)
 653                                 {
 654                                 /* error, we never saw this chunk */
 655                                 g_free(cp_data);
 656                                 return FALSE;
 657                                 }
 658                         memcpy(cp_data, data + chunk_offset[i], chunk_length[i]);
 659                         }
 660                 DEBUG_1("Found embedded icc profile in jpeg");
 661                 exif_add_jpeg_color_profile(exif, cp_data, cp_length);
 662
 663                 return TRUE;
 664                 }
 665
 666         return FALSE;
 667 }