src/exif-common.c

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