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