1 /* exif-tag.c
2 *
3 * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA.
19 */
20
21 #include <config.h>
22
23 #include <libexif/exif-tag.h>
24 #include <libexif/i18n.h>
25
26 #include <stdlib.h>
27 #include <string.h>
28
29 #define ESL_NNNN { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
30 #define ESL_OOOO { EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL }
31 #define ESL_MMMN { EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
32 #define ESL_MMMM { EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY }
33 #define ESL_OMON { EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
34 #define ESL_NNOO { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL }
35 #define ESL_NNMN { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
36 #define ESL_NNMM { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY }
37 #define ESL_NNNM { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY }
38 #define ESL_NNNO { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_OPTIONAL }
39 #define ESL_GPS { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN }
40
41 /*!
42 * Table giving information about each EXIF tag.
43 * There may be more than one entry with the same tag value because some tags
44 * have different meanings depending on the IFD in which they appear.
45 * When there are such duplicate entries, there must be no overlap in their
46 * support levels.
47 * The entries MUST be sorted in tag order.
48 * The name and title are mandatory, but the description may be an empty
49 * string. None of the entries may be NULL except the final array terminator.
50 */
51 static const struct TagEntry {
52 /*! Tag ID. There may be duplicate tags when the same number is used for
53 * different meanings in different IFDs. */
54 ExifTag tag;
55 const char *name;
56 const char *title;
57 const char *description;
58 /*! indexed by the types [ExifIfd][ExifDataType] */
59 ExifSupportLevel esl[EXIF_IFD_COUNT][EXIF_DATA_TYPE_COUNT];
60 } ExifTagTable[] = {
61 #ifndef NO_VERBOSE_TAG_STRINGS
62 {EXIF_TAG_GPS_VERSION_ID, "GPSVersionID", N_("GPS Tag Version"),
63 N_("Indicates the version of <GPSInfoIFD>. The version is given "
64 "as 2.0.0.0. This tag is mandatory when <GPSInfo> tag is "
65 "present. (Note: The <GPSVersionID> tag is given in bytes, "
66 "unlike the <ExifVersion> tag. When the version is "
67 "2.0.0.0, the tag value is 02000000.H)."), ESL_GPS},
68 {EXIF_TAG_INTEROPERABILITY_INDEX, "InteroperabilityIndex",
69 N_("Interoperability Index"),
70 N_("Indicates the identification of the Interoperability rule. "
71 "Use \"R98\" for stating ExifR98 Rules. Four bytes used "
72 "including the termination code (NULL). see the separate "
73 "volume of Recommended Exif Interoperability Rules (ExifR98) "
74 "for other tags used for ExifR98."),
75 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO } },
76 {EXIF_TAG_GPS_LATITUDE_REF, "GPSLatitudeRef", N_("North or South Latitude"),
77 N_("Indicates whether the latitude is north or south latitude. The "
78 "ASCII value 'N' indicates north latitude, and 'S' is south "
79 "latitude."), ESL_GPS},
80 {EXIF_TAG_INTEROPERABILITY_VERSION, "InteroperabilityVersion",
81 N_("Interoperability Version"), "",
82 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO } },
83 {EXIF_TAG_GPS_LATITUDE, "GPSLatitude", N_("Latitude"),
84 N_("Indicates the latitude. The latitude is expressed as three "
85 "RATIONAL values giving the degrees, minutes, and seconds, "
86 "respectively. When degrees, minutes and seconds are expressed, "
87 "the format is dd/1,mm/1,ss/1. When degrees and minutes are used "
88 "and, for example, fractions of minutes are given up to two "
89 "decimal places, the format is dd/1,mmmm/100,0/1."),
90 ESL_GPS},
91 {EXIF_TAG_GPS_LONGITUDE_REF, "GPSLongitudeRef", N_("East or West Longitude"),
92 N_("Indicates whether the longitude is east or west longitude. "
93 "ASCII 'E' indicates east longitude, and 'W' is west "
94 "longitude."), ESL_GPS},
95 {EXIF_TAG_GPS_LONGITUDE, "GPSLongitude", N_("Longitude"),
96 N_("Indicates the longitude. The longitude is expressed as three "
97 "RATIONAL values giving the degrees, minutes, and seconds, "
98 "respectively. When degrees, minutes and seconds are expressed, "
99 "the format is ddd/1,mm/1,ss/1. When degrees and minutes are "
100 "used and, for example, fractions of minutes are given up to "
101 "two decimal places, the format is ddd/1,mmmm/100,0/1."),
102 ESL_GPS},
103 {EXIF_TAG_GPS_ALTITUDE_REF, "GPSAltitudeRef", N_("Altitude Reference"),
104 N_("Indicates the altitude used as the reference altitude. If the "
105 "reference is sea level and the altitude is above sea level, 0 "
106 "is given. If the altitude is below sea level, a value of 1 is given "
107 "and the altitude is indicated as an absolute value in the "
108 "GSPAltitude tag. The reference unit is meters. Note that this tag "
109 "is BYTE type, unlike other reference tags."), ESL_GPS},
110 {EXIF_TAG_GPS_ALTITUDE, "GPSAltitude", N_("Altitude"),
111 N_("Indicates the altitude based on the reference in GPSAltitudeRef. "
112 "Altitude is expressed as one RATIONAL value. The reference unit "
113 "is meters."), ESL_GPS},
114 {EXIF_TAG_GPS_TIME_STAMP, "GPSTimeStamp", N_("GPS Time (Atomic Clock)"),
115 N_("Indicates the time as UTC (Coordinated Universal Time). "
116 "TimeStamp is expressed as three RATIONAL values giving "
117 "the hour, minute, and second."), ESL_GPS},
118 {EXIF_TAG_GPS_SATELLITES, "GPSSatellites", N_("GPS Satellites"),
119 N_("Indicates the GPS satellites used for measurements. This "
120 "tag can be used to describe the number of satellites, their ID "
121 "number, angle of elevation, azimuth, SNR and other information "
122 "in ASCII notation. The format is not specified. If the GPS "
123 "receiver is incapable of taking measurements, value of the tag "
124 "shall be set to NULL."), ESL_GPS},
125 {EXIF_TAG_GPS_STATUS, "GPSStatus", N_("GPS Receiver Status"),
126 N_("Indicates the status of the GPS receiver when the image is "
127 "recorded. 'A' means measurement is in progress, and 'V' means "
128 "the measurement is Interoperability."), ESL_GPS},
129 {EXIF_TAG_GPS_MEASURE_MODE, "GPSMeasureMode", N_("GPS Measurement Mode"),
130 N_("Indicates the GPS measurement mode. '2' means "
131 "two-dimensional measurement and '3' means three-dimensional "
132 "measurement is in progress."), ESL_GPS},
133 {EXIF_TAG_GPS_DOP, "GPSDOP", N_("Measurement Precision"),
134 N_("Indicates the GPS DOP (data degree of precision). An HDOP "
135 "value is written during two-dimensional measurement, and PDOP "
136 "during three-dimensional measurement."), ESL_GPS},
137 {EXIF_TAG_GPS_SPEED_REF, "GPSSpeedRef", N_("Speed Unit"),
138 N_("Indicates the unit used to express the GPS receiver speed "
139 "of movement. 'K', 'M' and 'N' represent kilometers per hour, "
140 "miles per hour, and knots."), ESL_GPS},
141 {EXIF_TAG_GPS_SPEED, "GPSSpeed", N_("Speed of GPS Receiver"),
142 N_("Indicates the speed of GPS receiver movement."), ESL_GPS},
143 {EXIF_TAG_GPS_TRACK_REF, "GPSTrackRef", N_("Reference for direction of movement"),
144 N_("Indicates the reference for giving the direction of GPS "
145 "receiver movement. 'T' denotes true direction and 'M' is "
146 "magnetic direction."), ESL_GPS},
147 {EXIF_TAG_GPS_TRACK, "GPSTrack", N_("Direction of Movement"),
148 N_("Indicates the direction of GPS receiver movement. The range "
149 "of values is from 0.00 to 359.99."), ESL_GPS},
150 {EXIF_TAG_GPS_IMG_DIRECTION_REF, "GPSImgDirectionRef", N_("GPS Image Direction Reference"),
151 N_("Indicates the reference for giving the direction of the image when it is captured. "
152 "'T' denotes true direction and 'M' is magnetic direction."), ESL_GPS},
153 {EXIF_TAG_GPS_IMG_DIRECTION, "GPSImgDirection", N_("GPS Image Direction"),
154 N_("Indicates the direction of the image when it was captured. The range of values is "
155 "from 0.00 to 359.99."), ESL_GPS},
156 {EXIF_TAG_GPS_MAP_DATUM, "GPSMapDatum", N_("Geodetic Survey Data Used"),
157 N_("Indicates the geodetic survey data used by the GPS "
158 "receiver. If the survey data is restricted to Japan, the value "
159 "of this tag is 'TOKYO' or 'WGS-84'. If a GPS Info tag is "
160 "recorded, it is strongly recommended that this tag be recorded."), ESL_GPS},
161 {EXIF_TAG_GPS_DEST_LATITUDE_REF, "GPSDestLatitudeRef", N_("Reference For Latitude of Destination"),
162 N_("Indicates whether the latitude of the destination point is "
163 "north or south latitude. The ASCII value 'N' indicates north "
164 "latitude, and 'S' is south latitude."), ESL_GPS},
165 {EXIF_TAG_GPS_DEST_LATITUDE, "GPSDestLatitude", N_("Latitude of Destination"),
166 N_("Indicates the latitude of the destination point. The "
167 "latitude is expressed as three RATIONAL values giving the "
168 "degrees, minutes, and seconds, respectively. If latitude is "
169 "expressed as degrees, minutes and seconds, a typical format "
170 "would be dd/1,mm/1,ss/1. When degrees and minutes are used and, "
171 "for example, fractions of minutes are given up to two decimal "
172 "places, the format would be dd/1,mmmm/100,0/1."), ESL_GPS},
173 {EXIF_TAG_GPS_DEST_LONGITUDE_REF, "GPSDestLongitudeRef", N_("Reference for Longitude of Destination"),
174 N_("Indicates whether the longitude of the destination point is "
175 "east or west longitude. ASCII 'E' indicates east longitude, and "
176 "'W' is west longitude."), ESL_GPS},
177 {EXIF_TAG_GPS_DEST_LONGITUDE, "GPSDestLongitude", N_("Longitude of Destination"),
178 N_("Indicates the longitude of the destination point. The "
179 "longitude is expressed as three RATIONAL values giving the "
180 "degrees, minutes, and seconds, respectively. If longitude is "
181 "expressed as degrees, minutes and seconds, a typical format "
182 "would be ddd/1,mm/1,ss/1. When degrees and minutes are used "
183 "and, for example, fractions of minutes are given up to two "
184 "decimal places, the format would be ddd/1,mmmm/100,0/1."),
185 ESL_GPS},
186 {EXIF_TAG_GPS_DEST_BEARING_REF, "GPSDestBearingRef", N_("Reference for Bearing of Destination"),
187 N_("Indicates the reference used for giving the bearing to "
188 "the destination point. 'T' denotes true direction and 'M' is "
189 "magnetic direction."), ESL_GPS},
190 {EXIF_TAG_GPS_DEST_BEARING, "GPSDestBearing", N_("Bearing of Destination"),
191 N_("Indicates the bearing to the destination point. The range "
192 "of values is from 0.00 to 359.99."), ESL_GPS},
193 {EXIF_TAG_GPS_DEST_DISTANCE_REF, "GPSDestDistanceRef", N_("Reference for Distance to Destination"),
194 N_("Indicates the unit used to express the distance to the "
195 "destination point. 'K', 'M' and 'N' represent kilometers, miles "
196 "and nautical miles."), ESL_GPS},
197 {EXIF_TAG_GPS_DEST_DISTANCE, "GPSDestDistance", N_("Distance to Destination"),
198 N_("Indicates the distance to the destination point."), ESL_GPS},
199 {EXIF_TAG_GPS_PROCESSING_METHOD, "GPSProcessingMethod", N_("Name of GPS Processing Method"),
200 N_("A character string recording the name of the method used "
201 "for location finding. The first byte indicates the character "
202 "code used, and this is followed by the name "
203 "of the method. Since the Type is not ASCII, NULL termination is "
204 "not necessary."), ESL_GPS},
205 {EXIF_TAG_GPS_AREA_INFORMATION, "GPSAreaInformation", N_("Name of GPS Area"),
206 N_("A character string recording the name of the GPS area. The "
207 "first byte indicates the character code used, "
208 "and this is followed by the name of the GPS area. Since "
209 "the Type is not ASCII, NULL termination is not necessary."), ESL_GPS},
210 {EXIF_TAG_GPS_DATE_STAMP, "GPSDateStamp", N_("GPS Date"),
211 N_("A character string recording date and time information "
212 "relative to UTC (Coordinated Universal Time). The format is "
213 "\"YYYY:MM:DD\". The length of the string is 11 bytes including "
214 "NULL."), ESL_GPS},
215 {EXIF_TAG_GPS_DIFFERENTIAL, "GPSDifferential", N_("GPS Differential Correction"),
216 N_("Indicates whether differential correction is applied to the "
217 "GPS receiver."), ESL_GPS},
218 /* Not in EXIF 2.2 */
219 {EXIF_TAG_NEW_SUBFILE_TYPE, "NewSubfileType",
220 N_("New Subfile Type"), N_("A general indication of the kind of data "
221 "contained in this subfile.")},
222 {EXIF_TAG_IMAGE_WIDTH, "ImageWidth", N_("Image Width"),
223 N_("The number of columns of image data, equal to the number of "
224 "pixels per row. In JPEG compressed data a JPEG marker is "
225 "used instead of this tag."),
226 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
227 {EXIF_TAG_IMAGE_LENGTH, "ImageLength", N_("Image Length"),
228 N_("The number of rows of image data. In JPEG compressed data a "
229 "JPEG marker is used instead of this tag."),
230 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
231 {EXIF_TAG_BITS_PER_SAMPLE, "BitsPerSample", N_("Bits per Sample"),
232 N_("The number of bits per image component. In this standard each "
233 "component of the image is 8 bits, so the value for this "
234 "tag is 8. See also <SamplesPerPixel>. In JPEG compressed data "
235 "a JPEG marker is used instead of this tag."),
236 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
237 {EXIF_TAG_COMPRESSION, "Compression", N_("Compression"),
238 N_("The compression scheme used for the image data. When a "
239 "primary image is JPEG compressed, this designation is "
240 "not necessary and is omitted. When thumbnails use JPEG "
241 "compression, this tag value is set to 6."),
242 { ESL_MMMN, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
243 {EXIF_TAG_PHOTOMETRIC_INTERPRETATION, "PhotometricInterpretation",
244 N_("Photometric Interpretation"),
245 N_("The pixel composition. In JPEG compressed data a JPEG "
246 "marker is used instead of this tag."),
247 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
248 /* Not in EXIF 2.2 */
249 {EXIF_TAG_FILL_ORDER, "FillOrder", N_("Fill Order"), ""},
250 /* Not in EXIF 2.2 */
251 {EXIF_TAG_DOCUMENT_NAME, "DocumentName", N_("Document Name"), ""},
252 {EXIF_TAG_IMAGE_DESCRIPTION, "ImageDescription",
253 N_("Image Description"),
254 N_("A character string giving the title of the image. It may be "
255 "a comment such as \"1988 company picnic\" or "
256 "the like. Two-bytes character codes cannot be used. "
257 "When a 2-bytes code is necessary, the Exif Private tag "
258 "<UserComment> is to be used."),
259 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
260 {EXIF_TAG_MAKE, "Make", N_("Manufacturer"),
261 N_("The manufacturer of the recording "
262 "equipment. This is the manufacturer of the DSC, scanner, "
263 "video digitizer or other equipment that generated the "
264 "image. When the field is left blank, it is treated as "
265 "unknown."),
266 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
267 {EXIF_TAG_MODEL, "Model", N_("Model"),
268 N_("The model name or model number of the equipment. This is the "
269 "model name or number of the DSC, scanner, video digitizer "
270 "or other equipment that generated the image. When the field "
271 "is left blank, it is treated as unknown."),
272 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
273 {EXIF_TAG_STRIP_OFFSETS, "StripOffsets", N_("Strip Offsets"),
274 N_("For each strip, the byte offset of that strip. It is "
275 "recommended that this be selected so the number of strip "
276 "bytes does not exceed 64 Kbytes. With JPEG compressed "
277 "data this designation is not needed and is omitted. See also "
278 "<RowsPerStrip> and <StripByteCounts>."),
279 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
280 {EXIF_TAG_ORIENTATION, "Orientation", N_("Orientation"),
281 N_("The image orientation viewed in terms of rows and columns."),
282 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
283 {EXIF_TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel",
284 N_("Samples per Pixel"),
285 N_("The number of components per pixel. Since this standard applies "
286 "to RGB and YCbCr images, the value set for this tag is 3. "
287 "In JPEG compressed data a JPEG marker is used instead of this "
288 "tag."),
289 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
290 {EXIF_TAG_ROWS_PER_STRIP, "RowsPerStrip", N_("Rows per Strip"),
291 N_("The number of rows per strip. This is the number of rows "
292 "in the image of one strip when an image is divided into "
293 "strips. With JPEG compressed data this designation is not "
294 "needed and is omitted. See also <StripOffsets> and "
295 "<StripByteCounts>."),
296 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
297 {EXIF_TAG_STRIP_BYTE_COUNTS, "StripByteCounts", N_("Strip Byte Count"),
298 N_("The total number of bytes in each strip. With JPEG compressed "
299 "data this designation is not needed and is omitted."),
300 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
301 {EXIF_TAG_X_RESOLUTION, "XResolution", N_("X-Resolution"),
302 N_("The number of pixels per <ResolutionUnit> in the <ImageWidth> "
303 "direction. When the image resolution is unknown, 72 [dpi] "
304 "is designated."),
305 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
306 {EXIF_TAG_Y_RESOLUTION, "YResolution", N_("Y-Resolution"),
307 N_("The number of pixels per <ResolutionUnit> in the <ImageLength> "
308 "direction. The same value as <XResolution> is designated."),
309 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
310 {EXIF_TAG_PLANAR_CONFIGURATION, "PlanarConfiguration",
311 N_("Planar Configuration"),
312 N_("Indicates whether pixel components are recorded in a chunky "
313 "or planar format. In JPEG compressed files a JPEG marker "
314 "is used instead of this tag. If this field does not exist, "
315 "the TIFF default of 1 (chunky) is assumed."),
316 { ESL_OMON, ESL_OMON, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
317 {EXIF_TAG_RESOLUTION_UNIT, "ResolutionUnit", N_("Resolution Unit"),
318 N_("The unit for measuring <XResolution> and <YResolution>. The same "
319 "unit is used for both <XResolution> and <YResolution>. If "
320 "the image resolution is unknown, 2 (inches) is designated."),
321 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
322 {EXIF_TAG_TRANSFER_FUNCTION, "TransferFunction",
323 N_("Transfer Function"),
324 N_("A transfer function for the image, described in tabular style. "
325 "Normally this tag is not necessary, since color space is "
326 "specified in the color space information tag (<ColorSpace>)."),
327 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
328 {EXIF_TAG_SOFTWARE, "Software", N_("Software"),
329 N_("This tag records the name and version of the software or "
330 "firmware of the camera or image input device used to "
331 "generate the image. The detailed format is not specified, but "
332 "it is recommended that the example shown below be "
333 "followed. When the field is left blank, it is treated as "
334 "unknown."),
335 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
336 {EXIF_TAG_DATE_TIME, "DateTime", N_("Date and Time"),
337 N_("The date and time of image creation. In this standard "
338 "(EXIF-2.1) it is the date and time the file was changed."),
339 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
340 {EXIF_TAG_ARTIST, "Artist", N_("Artist"),
341 N_("This tag records the name of the camera owner, photographer or "
342 "image creator. The detailed format is not specified, but it is "
343 "recommended that the information be written as in the example "
344 "below for ease of Interoperability. When the field is "
345 "left blank, it is treated as unknown."),
346 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
347 {EXIF_TAG_WHITE_POINT, "WhitePoint", N_("White Point"),
348 N_("The chromaticity of the white point of the image. Normally "
349 "this tag is not necessary, since color space is specified "
350 "in the color space information tag (<ColorSpace>)."),
351 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
352 {EXIF_TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities",
353 N_("Primary Chromaticities"),
354 N_("The chromaticity of the three primary colors of the image. "
355 "Normally this tag is not necessary, since color space is "
356 "specified in the color space information tag (<ColorSpace>)."),
357 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
358 /* Not in EXIF 2.2 */
359 {EXIF_TAG_SUB_IFDS, "SubIFDs", "SubIFD Offsets", N_("Defined by Adobe Corporation "
360 "to enable TIFF Trees within a TIFF file.")},
361 /* Not in EXIF 2.2 */
362 {EXIF_TAG_TRANSFER_RANGE, "TransferRange", N_("Transfer Range"), ""},
363 /* Not in EXIF 2.2 */
364 {EXIF_TAG_JPEG_PROC, "JPEGProc", "JPEGProc", ""},
365 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT, "JPEGInterchangeFormat",
366 N_("JPEG Interchange Format"),
367 N_("The offset to the start byte (SOI) of JPEG compressed "
368 "thumbnail data. This is not used for primary image "
369 "JPEG data."),
370 { ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
371 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
372 "JPEGInterchangeFormatLength", N_("JPEG Interchange Format Length"),
373 N_("The number of bytes of JPEG compressed thumbnail data. This "
374 "is not used for primary image JPEG data. JPEG thumbnails "
375 "are not divided but are recorded as a continuous JPEG "
376 "bitstream from SOI to EOI. Appn and COM markers should "
377 "not be recorded. Compressed thumbnails must be recorded in no "
378 "more than 64 Kbytes, including all other data to be "
379 "recorded in APP1."),
380 { ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
381 {EXIF_TAG_YCBCR_COEFFICIENTS, "YCbCrCoefficients",
382 N_("YCbCr Coefficients"),
383 N_("The matrix coefficients for transformation from RGB to YCbCr "
384 "image data. No default is given in TIFF; but here the "
385 "value given in \"Color Space Guidelines\", is used "
386 "as the default. The color space is declared in a "
387 "color space information tag, with the default being the value "
388 "that gives the optimal image characteristics "
389 "Interoperability this condition."),
390 { ESL_NNOO, ESL_NNOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
391 {EXIF_TAG_YCBCR_SUB_SAMPLING, "YCbCrSubSampling",
392 N_("YCbCr Sub-Sampling"),
393 N_("The sampling ratio of chrominance components in relation to the "
394 "luminance component. In JPEG compressed data a JPEG marker "
395 "is used instead of this tag."),
396 { ESL_NNMN, ESL_NNMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
397 {EXIF_TAG_YCBCR_POSITIONING, "YCbCrPositioning",
398 N_("YCbCr Positioning"),
399 N_("The position of chrominance components in relation to the "
400 "luminance component. This field is designated only for "
401 "JPEG compressed data or uncompressed YCbCr data. The TIFF "
402 "default is 1 (centered); but when Y:Cb:Cr = 4:2:2 it is "
403 "recommended in this standard that 2 (co-sited) be used to "
404 "record data, in order to improve the image quality when viewed "
405 "on TV systems. When this field does not exist, the reader shall "
406 "assume the TIFF default. In the case of Y:Cb:Cr = 4:2:0, the "
407 "TIFF default (centered) is recommended. If the reader "
408 "does not have the capability of supporting both kinds of "
409 "<YCbCrPositioning>, it shall follow the TIFF default regardless "
410 "of the value in this field. It is preferable that readers "
411 "be able to support both centered and co-sited positioning."),
412 { ESL_NNMM, ESL_NNOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
413 {EXIF_TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite",
414 N_("Reference Black/White"),
415 N_("The reference black point value and reference white point "
416 "value. No defaults are given in TIFF, but the values "
417 "below are given as defaults here. The color space is declared "
418 "in a color space information tag, with the default "
419 "being the value that gives the optimal image characteristics "
420 "Interoperability these conditions."),
421 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
422 /* Not in EXIF 2.2 */
423 {EXIF_TAG_XML_PACKET, "XMLPacket", N_("XML Packet"), N_("XMP Metadata")},
424 /* Not in EXIF 2.2 */
425 {EXIF_TAG_RELATED_IMAGE_FILE_FORMAT, "RelatedImageFileFormat",
426 "RelatedImageFileFormat", ""},
427 /* Not in EXIF 2.2 */
428 {EXIF_TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth",
429 "RelatedImageWidth", ""},
430 /* Not in EXIF 2.2 */
431 {EXIF_TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength",
432 "RelatedImageLength", ""},
433 /* Not in EXIF 2.2 */
434 {EXIF_TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim",
435 "CFARepeatPatternDim", ""},
436 /* Not in EXIF 2.2 */
437 {EXIF_TAG_CFA_PATTERN, "CFAPattern",
438 N_("CFA Pattern"),
439 N_("Indicates the color filter array (CFA) geometric pattern of the "
440 "image sensor when a one-chip color area sensor is used. "
441 "It does not apply to all sensing methods.")},
442 /* Not in EXIF 2.2 */
443 {EXIF_TAG_BATTERY_LEVEL, "BatteryLevel", N_("Battery Level"), ""},
444 {EXIF_TAG_COPYRIGHT, "Copyright", N_("Copyright"),
445 N_("Copyright information. In this standard the tag is used to "
446 "indicate both the photographer and editor copyrights. It is "
447 "the copyright notice of the person or organization claiming "
448 "rights to the image. The Interoperability copyright "
449 "statement including date and rights should be written in this "
450 "field; e.g., \"Copyright, John Smith, 19xx. All rights "
451 "reserved.\". In this standard the field records both the "
452 "photographer and editor copyrights, with each recorded in a "
453 "separate part of the statement. When there is a clear "
454 "distinction between the photographer and editor copyrights, "
455 "these are to be written in the order of photographer followed "
456 "by editor copyright, separated by NULL (in this case, "
457 "since the statement also ends with a NULL, there are two NULL "
458 "codes) (see example 1). When only the photographer is given, "
459 "it is terminated by one NULL code (see example 2). When only "
460 "the editor copyright is given, "
461 "the photographer copyright part consists of one space followed "
462 "by a terminating NULL code, then the editor copyright is given "
463 "(see example 3). When the field is left blank, it is treated "
464 "as unknown."),
465 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
466 {EXIF_TAG_EXPOSURE_TIME, "ExposureTime", N_("Exposure Time"),
467 N_("Exposure time, given in seconds (sec)."),
468 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
469 {EXIF_TAG_FNUMBER, "FNumber", N_("F-Number"),
470 N_("The F number."),
471 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
472 /* Not in EXIF 2.2 */
473 {EXIF_TAG_IPTC_NAA, "IPTC/NAA", "IPTC/NAA", ""},
474 /* Not in EXIF 2.2 */
475 {EXIF_TAG_IMAGE_RESOURCES, "ImageResources", N_("Image Resources Block"), ""},
476 {EXIF_TAG_EXIF_IFD_POINTER, "ExifIfdPointer", "ExifIFDPointer",
477 N_("A pointer to the Exif IFD. Interoperability, Exif IFD has the "
478 "same structure as that of the IFD specified in TIFF. "
479 "ordinarily, however, it does not contain image data as in "
480 "the case of TIFF."),
481 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
482 /* Not in EXIF 2.2 */
483 {EXIF_TAG_INTER_COLOR_PROFILE, "InterColorProfile",
484 "InterColorProfile", ""},
485 {EXIF_TAG_EXPOSURE_PROGRAM, "ExposureProgram", N_("Exposure Program"),
486 N_("The class of the program used by the camera to set exposure "
487 "when the picture is taken."),
488 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
489 {EXIF_TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity",
490 N_("Spectral Sensitivity"),
491 N_("Indicates the spectral sensitivity of each channel of the "
492 "camera used. The tag value is an ASCII string compatible "
493 "with the standard developed by the ASTM Technical Committee."),
494 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
495 {EXIF_TAG_GPS_INFO_IFD_POINTER, "GPSInfoIFDPointer",
496 N_("GPS Info IFD Pointer"),
497 N_("A pointer to the GPS Info IFD. The "
498 "Interoperability structure of the GPS Info IFD, like that of "
499 "Exif IFD, has no image data."),
500 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
501
502 {EXIF_TAG_ISO_SPEED_RATINGS, "ISOSpeedRatings",
503 N_("ISO Speed Ratings"),
504 N_("Indicates the ISO Speed and ISO Latitude of the camera or "
505 "input device as specified in ISO 12232."),
506 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
507 {EXIF_TAG_OECF, "OECF", N_("Opto-Electronic Conversion Function"),
508 N_("Indicates the Opto-Electronic Conversion Function (OECF) "
509 "specified in ISO 14524. <OECF> is the relationship between "
510 "the camera optical input and the image values."),
511 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
512 /* Not in EXIF 2.2 */
513 {EXIF_TAG_TIME_ZONE_OFFSET, "TimeZoneOffset", N_("Time Zone Offset"),
514 N_("Encodes time zone of camera clock relative to GMT.")},
515 {EXIF_TAG_EXIF_VERSION, "ExifVersion", N_("Exif Version"),
516 N_("The version of this standard supported. Nonexistence of this "
517 "field is taken to mean nonconformance to the standard."),
518 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
519 {EXIF_TAG_DATE_TIME_ORIGINAL, "DateTimeOriginal",
520 N_("Date and Time (Original)"),
521 N_("The date and time when the original image data was generated. "
522 "For a digital still camera "
523 "the date and time the picture was taken are recorded."),
524 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
525 {EXIF_TAG_DATE_TIME_DIGITIZED, "DateTimeDigitized",
526 N_("Date and Time (Digitized)"),
527 N_("The date and time when the image was stored as digital data."),
528 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
529 {EXIF_TAG_COMPONENTS_CONFIGURATION, "ComponentsConfiguration",
530 N_("Components Configuration"),
531 N_("Information specific to compressed data. The channels of "
532 "each component are arranged in order from the 1st "
533 "component to the 4th. For uncompressed data the data "
534 "arrangement is given in the <PhotometricInterpretation> tag. "
535 "However, since <PhotometricInterpretation> can only "
536 "express the order of Y, Cb and Cr, this tag is provided "
537 "for cases when compressed data uses components other than "
538 "Y, Cb, and Cr and to enable support of other sequences."),
539 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
540 {EXIF_TAG_COMPRESSED_BITS_PER_PIXEL, "CompressedBitsPerPixel",
541 N_("Compressed Bits per Pixel"),
542 N_("Information specific to compressed data. The compression mode "
543 "used for a compressed image is indicated in unit bits "
544 "per pixel."),
545 { ESL_NNNN, ESL_NNNN, ESL_NNNO, ESL_NNNN, ESL_NNNN } },
546 {EXIF_TAG_SHUTTER_SPEED_VALUE, "ShutterSpeedValue", N_("Shutter Speed"),
547 N_("Shutter speed. The unit is the APEX (Additive System of "
548 "Photographic Exposure) setting."),
549 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
550 {EXIF_TAG_APERTURE_VALUE, "ApertureValue", N_("Aperture"),
551 N_("The lens aperture. The unit is the APEX value."),
552 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
553 {EXIF_TAG_BRIGHTNESS_VALUE, "BrightnessValue", N_("Brightness"),
554 N_("The value of brightness. The unit is the APEX value. "
555 "Ordinarily it is given in the range of -99.99 to 99.99."),
556 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
557 {EXIF_TAG_EXPOSURE_BIAS_VALUE, "ExposureBiasValue",
558 N_("Exposure Bias"),
559 N_("The exposure bias. The units is the APEX value. Ordinarily "
560 "it is given in the range of -99.99 to 99.99."),
561 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
562 {EXIF_TAG_MAX_APERTURE_VALUE, "MaxApertureValue", N_("Maximum Aperture Value"),
563 N_("The smallest F number of the lens. The unit is the APEX value. "
564 "Ordinarily it is given in the range of 00.00 to 99.99, "
565 "but it is not limited to this range."),
566 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
567 {EXIF_TAG_SUBJECT_DISTANCE, "SubjectDistance",
568 N_("Subject Distance"),
569 N_("The distance to the subject, given in meters."),
570 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
571 {EXIF_TAG_METERING_MODE, "MeteringMode", N_("Metering Mode"),
572 N_("The metering mode."),
573 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
574 {EXIF_TAG_LIGHT_SOURCE, "LightSource", N_("Light Source"),
575 N_("The kind of light source."),
576 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
577 {EXIF_TAG_FLASH, "Flash", N_("Flash"),
578 N_("This tag is recorded when an image is taken using a strobe "
579 "light (flash)."),
580 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
581 {EXIF_TAG_FOCAL_LENGTH, "FocalLength", N_("Focal Length"),
582 N_("The actual focal length of the lens, in mm. Conversion is not "
583 "made to the focal length of a 35 mm film camera."),
584 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
585 {EXIF_TAG_SUBJECT_AREA, "SubjectArea", N_("Subject Area"),
586 N_("This tag indicates the location and area of the main subject "
587 "in the overall scene."),
588 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
589 /* Not in EXIF 2.2 */
590 {EXIF_TAG_TIFF_EP_STANDARD_ID, "TIFF/EPStandardID", N_("TIFF/EP Standard ID"), ""},
591 {EXIF_TAG_MAKER_NOTE, "MakerNote", N_("Maker Note"),
592 N_("A tag for manufacturers of Exif writers to record any desired "
593 "information. The contents are up to the manufacturer."),
594 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
595 {EXIF_TAG_USER_COMMENT, "UserComment", N_("User Comment"),
596 N_("A tag for Exif users to write keywords or comments on the image "
597 "besides those in <ImageDescription>, and without the "
598 "character code limitations of the <ImageDescription> tag. The "
599 "character code used in the <UserComment> tag is identified "
600 "based on an ID code in a fixed 8-byte area at the start of "
601 "the tag data area. The unused portion of the area is padded "
602 "with NULL (\"00.h\"). ID codes are assigned by means of "
603 "registration. The designation method and references for each "
604 "character code are defined in the specification. The value of "
605 "CountN is determined based on the 8 bytes in the character code "
606 "area and the number of bytes in the user comment part. Since "
607 "the TYPE is not ASCII, NULL termination is not necessary. "
608 "The ID code for the <UserComment> area may be a Defined code "
609 "such as JIS or ASCII, or may be Undefined. The Undefined name "
610 "is UndefinedText, and the ID code is filled with 8 bytes of all "
611 "\"NULL\" (\"00.H\"). An Exif reader that reads the "
612 "<UserComment> tag must have a function for determining the "
613 "ID code. This function is not required in Exif readers that "
614 "do not use the <UserComment> tag. "
615 "When a <UserComment> area is set aside, it is recommended that "
616 "the ID code be ASCII and that the following user comment "
617 "part be filled with blank characters [20.H]."),
618 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
619 {EXIF_TAG_SUB_SEC_TIME, "SubsecTime", N_("Sub-second Time"),
620 N_("A tag used to record fractions of seconds for the "
621 "<DateTime> tag."),
622 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
623 {EXIF_TAG_SUB_SEC_TIME_ORIGINAL, "SubSecTimeOriginal",
624 N_("Sub-second Time (Original)"),
625 N_("A tag used to record fractions of seconds for the "
626 "<DateTimeOriginal> tag."),
627 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
628 {EXIF_TAG_SUB_SEC_TIME_DIGITIZED, "SubSecTimeDigitized",
629 N_("Sub-second Time (Digitized)"),
630 N_("A tag used to record fractions of seconds for the "
631 "<DateTimeDigitized> tag."),
632 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
633 /* Not in EXIF 2.2 (Microsoft extension) */
634 {EXIF_TAG_XP_TITLE, "XPTitle", N_("XP Title"),
635 N_("A character string giving the title of the image, encoded in "
636 "UTF-16LE."),
637 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
638 /* Not in EXIF 2.2 (Microsoft extension) */
639 {EXIF_TAG_XP_COMMENT, "XPComment", N_("XP Comment"),
640 N_("A character string containing a comment about the image, encoded "
641 "in UTF-16LE."),
642 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
643 /* Not in EXIF 2.2 (Microsoft extension) */
644 {EXIF_TAG_XP_AUTHOR, "XPAuthor", N_("XP Author"),
645 N_("A character string containing the name of the image creator, "
646 "encoded in UTF-16LE."),
647 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
648 /* Not in EXIF 2.2 (Microsoft extension) */
649 {EXIF_TAG_XP_KEYWORDS, "XPKeywords", N_("XP Keywords"),
650 N_("A character string containing key words describing the image, "
651 "encoded in UTF-16LE."),
652 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
653 /* Not in EXIF 2.2 (Microsoft extension) */
654 {EXIF_TAG_XP_SUBJECT, "XPSubject", N_("XP Subject"),
655 N_("A character string giving the image subject, encoded in "
656 "UTF-16LE."),
657 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
658 {EXIF_TAG_FLASH_PIX_VERSION, "FlashPixVersion", "FlashPixVersion",
659 N_("The FlashPix format version supported by a FPXR file."),
660 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
661 {EXIF_TAG_COLOR_SPACE, "ColorSpace", N_("Color Space"),
662 N_("The color space information tag is always "
663 "recorded as the color space specifier. Normally sRGB (=1) "
664 "is used to define the color space based on the PC monitor "
665 "conditions and environment. If a color space other than "
666 "sRGB is used, Uncalibrated (=FFFF.H) is set. Image data "
667 "recorded as Uncalibrated can be treated as sRGB when it is "
668 "converted to FlashPix."),
669 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
670 {EXIF_TAG_PIXEL_X_DIMENSION, "PixelXDimension", N_("Pixel X Dimension"),
671 N_("Information specific to compressed data. When a "
672 "compressed file is recorded, the valid width of the "
673 "meaningful image must be recorded in this tag, whether or "
674 "not there is padding data or a restart marker. This tag "
675 "should not exist in an uncompressed file."),
676 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
677 {EXIF_TAG_PIXEL_Y_DIMENSION, "PixelYDimension", N_("Pixel Y Dimension"),
678 N_("Information specific to compressed data. When a compressed "
679 "file is recorded, the valid height of the meaningful image "
680 "must be recorded in this tag, whether or not there is padding "
681 "data or a restart marker. This tag should not exist in an "
682 "uncompressed file. "
683 "Since data padding is unnecessary in the vertical direction, "
684 "the number of lines recorded in this valid image height tag "
685 "will in fact be the same as that recorded in the SOF."),
686 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
687 {EXIF_TAG_RELATED_SOUND_FILE, "RelatedSoundFile",
688 N_("Related Sound File"),
689 N_("This tag is used to record the name of an audio file related "
690 "to the image data. The only relational information "
691 "recorded here is the Exif audio file name and extension (an "
692 "ASCII string consisting of 8 characters + '.' + 3 "
693 "characters). The path is not recorded. Stipulations on audio "
694 "and file naming conventions are defined in the specification. "
695 "When using this tag, audio files must be recorded in "
696 "conformance to the Exif audio format. Writers are also allowed "
697 "to store the data such as Audio within APP2 as FlashPix "
698 "extension stream data. "
699 "The mapping of Exif image files and audio files is done "
700 "in any of three ways, [1], [2] and [3]. If multiple files "
701 "are mapped to one file as in [2] or [3], the above "
702 "format is used to record just one audio file name. If "
703 "there are multiple audio files, the first recorded file is "
704 "given. In the case of [3], for example, for the "
705 "Exif image file \"DSC00001.JPG\" only \"SND00001.WAV\" is "
706 "given as the related Exif audio file. When there are three "
707 "Exif audio files \"SND00001.WAV\", \"SND00002.WAV\" and "
708 "\"SND00003.WAV\", the Exif image file name for each of them, "
709 "\"DSC00001.JPG\", is indicated. By combining multiple "
710 "relational information, a variety of playback possibilities "
711 "can be supported. The method of using relational information "
712 "is left to the implementation on the playback side. Since this "
713 "information is an ASCII character string, it is terminated by "
714 "NULL. When this tag is used to map audio files, the relation "
715 "of the audio file to image data must also be indicated on the "
716 "audio file end."),
717 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
718 {EXIF_TAG_INTEROPERABILITY_IFD_POINTER, "InteroperabilityIFDPointer",
719 N_("Interoperability IFD Pointer"),
720 N_("Interoperability IFD is composed of tags which stores the "
721 "information to ensure the Interoperability and pointed "
722 "by the following tag located in Exif IFD. "
723 "The Interoperability structure of Interoperability IFD is "
724 "the same as TIFF defined IFD structure "
725 "but does not contain the "
726 "image data characteristically compared with normal TIFF "
727 "IFD."),
728 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
729 {EXIF_TAG_FLASH_ENERGY, "FlashEnergy", N_("Flash Energy"),
730 N_("Indicates the strobe energy at the time the image is "
731 "captured, as measured in Beam Candle Power Seconds (BCPS)."),
732 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
733 {EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE, "SpatialFrequencyResponse",
734 N_("Spatial Frequency Response"),
735 N_("This tag records the camera or input device spatial frequency "
736 "table and SFR values in the direction of image width, "
737 "image height, and diagonal direction, as specified in ISO "
738 "12233."),
739 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
740 {EXIF_TAG_FOCAL_PLANE_X_RESOLUTION, "FocalPlaneXResolution",
741 N_("Focal Plane X-Resolution"),
742 N_("Indicates the number of pixels in the image width (X) direction "
743 "per <FocalPlaneResolutionUnit> on the camera focal plane."),
744 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
745 {EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION, "FocalPlaneYResolution",
746 N_("Focal Plane Y-Resolution"),
747 N_("Indicates the number of pixels in the image height (V) direction "
748 "per <FocalPlaneResolutionUnit> on the camera focal plane."),
749 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
750 {EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT, "FocalPlaneResolutionUnit",
751 N_("Focal Plane Resolution Unit"),
752 N_("Indicates the unit for measuring <FocalPlaneXResolution> and "
753 "<FocalPlaneYResolution>. This value is the same as the "
754 "<ResolutionUnit>."),
755 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
756 {EXIF_TAG_SUBJECT_LOCATION, "SubjectLocation",
757 N_("Subject Location"),
758 N_("Indicates the location of the main subject in the scene. The "
759 "value of this tag represents the pixel at the center of the "
760 "main subject relative to the left edge, prior to rotation "
761 "processing as per the <Rotation> tag. The first value "
762 "indicates the X column number and the second indicates "
763 "the Y row number."),
764 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
765 {EXIF_TAG_EXPOSURE_INDEX, "ExposureIndex", N_("Exposure Index"),
766 N_("Indicates the exposure index selected on the camera or "
767 "input device at the time the image is captured."),
768 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
769 {EXIF_TAG_SENSING_METHOD, "SensingMethod", N_("Sensing Method"),
770 N_("Indicates the image sensor type on the camera or input "
771 "device."),
772 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
773 {EXIF_TAG_FILE_SOURCE, "FileSource", N_("File Source"),
774 N_("Indicates the image source. If a DSC recorded the image, "
775 "the tag value of this tag always be set to 3, indicating "
776 "that the image was recorded on a DSC."),
777 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
778 {EXIF_TAG_SCENE_TYPE, "SceneType", N_("Scene Type"),
779 N_("Indicates the type of scene. If a DSC recorded the image, "
780 "this tag value must always be set to 1, indicating that the "
781 "image was directly photographed."),
782 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
783 {EXIF_TAG_NEW_CFA_PATTERN, "CFAPattern",
784 N_("CFA Pattern"),
785 N_("Indicates the color filter array (CFA) geometric pattern of the "
786 "image sensor when a one-chip color area sensor is used. "
787 "It does not apply to all sensing methods."),
788 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
789 {EXIF_TAG_CUSTOM_RENDERED, "CustomRendered", N_("Custom Rendered"),
790 N_("This tag indicates the use of special processing on image "
791 "data, such as rendering geared to output. When special "
792 "processing is performed, the reader is expected to disable "
793 "or minimize any further processing."),
794 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
795 {EXIF_TAG_EXPOSURE_MODE, "ExposureMode", N_("Exposure Mode"),
796 N_("This tag indicates the exposure mode set when the image was "
797 "shot. In auto-bracketing mode, the camera shoots a series of "
798 "frames of the same scene at different exposure settings."),
799 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
800 {EXIF_TAG_WHITE_BALANCE, "WhiteBalance", N_("White Balance"),
801 N_("This tag indicates the white balance mode set when the image "
802 "was shot."),
803 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
804 {EXIF_TAG_DIGITAL_ZOOM_RATIO, "DigitalZoomRatio",
805 N_("Digital Zoom Ratio"),
806 N_("This tag indicates the digital zoom ratio when the image was "
807 "shot. If the numerator of the recorded value is 0, this "
808 "indicates that digital zoom was not used."),
809 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
810 {EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM, "FocalLengthIn35mmFilm",
811 N_("Focal Length in 35mm Film"),
812 N_("This tag indicates the equivalent focal length assuming a "
813 "35mm film camera, in mm. A value of 0 means the focal "
814 "length is unknown. Note that this tag differs from the "
815 "FocalLength tag."),
816 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
817 {EXIF_TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType",
818 N_("Scene Capture Type"),
819 N_("This tag indicates the type of scene that was shot. It can "
820 "also be used to record the mode in which the image was "
821 "shot. Note that this differs from the scene type "
822 "<SceneType> tag."),
823 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
824 {EXIF_TAG_GAIN_CONTROL, "GainControl", N_("Gain Control"),
825 N_("This tag indicates the degree of overall image gain "
826 "adjustment."),
827 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
828 {EXIF_TAG_CONTRAST, "Contrast", N_("Contrast"),
829 N_("This tag indicates the direction of contrast processing "
830 "applied by the camera when the image was shot."),
831 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
832 {EXIF_TAG_SATURATION, "Saturation", N_("Saturation"),
833 N_("This tag indicates the direction of saturation processing "
834 "applied by the camera when the image was shot."),
835 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
836 {EXIF_TAG_SHARPNESS, "Sharpness", N_("Sharpness"),
837 N_("This tag indicates the direction of sharpness processing "
838 "applied by the camera when the image was shot."),
839 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
840 {EXIF_TAG_DEVICE_SETTING_DESCRIPTION, "DeviceSettingDescription",
841 N_("Device Setting Description"),
842 N_("This tag indicates information on the picture-taking "
843 "conditions of a particular camera model. The tag is used "
844 "only to indicate the picture-taking conditions in the "
845 "reader."),
846 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
847 {EXIF_TAG_SUBJECT_DISTANCE_RANGE, "SubjectDistanceRange",
848 N_("Subject Distance Range"),
849 N_("This tag indicates the distance to the subject."),
850 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
851 {EXIF_TAG_IMAGE_UNIQUE_ID, "ImageUniqueID", N_("Image Unique ID"),
852 N_("This tag indicates an identifier assigned uniquely to "
853 "each image. It is recorded as an ASCII string equivalent "
854 "to hexadecimal notation and 128-bit fixed length."),
855 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
856 /* Not in EXIF 2.2 */
857 {EXIF_TAG_GAMMA, "Gamma", N_("Gamma"),
858 N_("Indicates the value of coefficient gamma.")},
859 /* Not in EXIF 2.2 */
860 {EXIF_TAG_PRINT_IMAGE_MATCHING, "PrintImageMatching", N_("PRINT Image Matching"),
861 N_("Related to Epson's PRINT Image Matching technology")},
862 /* Not in EXIF 2.2 (from the Microsoft HD Photo specification) */
863 {EXIF_TAG_PADDING, "Padding", N_("Padding"),
864 N_("This tag reserves space that can be reclaimed later when "
865 "additional metadata are added. New metadata can be written "
866 "in place by replacing this tag with a smaller data element "
867 "and using the reclaimed space to store the new or expanded "
868 "metadata tags."),
869 { ESL_OOOO, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
870 #endif
871 {0, NULL, NULL, NULL}
872 };
873
874 /* For now, do not use these functions. */
875
876 /*!
877 * Return the number of entries in the EXIF tag table, including the
878 * terminating NULL entry.
879 */
880 inline unsigned int
exif_tag_table_count(void)881 exif_tag_table_count (void)
882 {
883 return sizeof (ExifTagTable) / sizeof (ExifTagTable[0]);
884 }
885
886
887 ExifTag
exif_tag_table_get_tag(unsigned int n)888 exif_tag_table_get_tag (unsigned int n)
889 {
890 return (n < exif_tag_table_count ()) ? ExifTagTable[n].tag : 0;
891 }
892
893 const char *
exif_tag_table_get_name(unsigned int n)894 exif_tag_table_get_name (unsigned int n)
895 {
896 return (n < exif_tag_table_count ()) ? ExifTagTable[n].name : NULL;
897 }
898
899 /*!
900 * Compares the tag with that in entry.
901 * \param[in] tag pointer to integer tag value
902 * \param[in] entry pointer to a struct TagEntry
903 * \return 0 if tags are equal, <0 if tag < entry, >0 if tag > entry
904 */
905 static int
match_tag(const void * tag,const void * entry)906 match_tag(const void *tag, const void *entry)
907 {
908 return *(int*)tag - ((struct TagEntry *)entry)->tag;
909 }
910
911
912 /*!
913 * Finds the first entry in the EXIF tag table with the given tag number
914 * using a binary search.
915 * \param[in] tag to find
916 * \return index into table, or -1 if not found
917 */
918 static int
exif_tag_table_first(ExifTag tag)919 exif_tag_table_first(ExifTag tag)
920 {
921 int i;
922 struct TagEntry *entry = bsearch(&tag, ExifTagTable,
923 exif_tag_table_count()-1, sizeof(struct TagEntry), match_tag);
924 if (!entry)
925 return -1; /* Not found */
926
927 /* Calculate index of found entry */
928 i = entry - ExifTagTable;
929
930 /* There may be other entries with the same tag number, so search
931 * backwards to find the first
932 */
933 while ((i > 0) && (ExifTagTable[i-1].tag == tag)) {
934 --i;
935 }
936 return i;
937 }
938
939 #define RECORDED \
940 ((ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_CHUNKY] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
941 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_PLANAR] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
942 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_YCC] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
943 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_COMPRESSED] != EXIF_SUPPORT_LEVEL_NOT_RECORDED))
944
945 const char *
exif_tag_get_name_in_ifd(ExifTag tag,ExifIfd ifd)946 exif_tag_get_name_in_ifd (ExifTag tag, ExifIfd ifd)
947 {
948 unsigned int i;
949 int first;
950
951 if (ifd >= EXIF_IFD_COUNT)
952 return NULL;
953 first = exif_tag_table_first(tag);
954 if (first < 0)
955 return NULL;
956
957 for (i = first; ExifTagTable[i].name; i++) {
958 if (ExifTagTable[i].tag == tag) {
959 if (RECORDED)
960 break;
961 } else
962 return NULL; /* Recorded tag not found in the table */
963 }
964 return ExifTagTable[i].name;
965 }
966
967 const char *
exif_tag_get_title_in_ifd(ExifTag tag,ExifIfd ifd)968 exif_tag_get_title_in_ifd (ExifTag tag, ExifIfd ifd)
969 {
970 unsigned int i;
971 int first;
972
973 if (ifd >= EXIF_IFD_COUNT)
974 return NULL;
975 first = exif_tag_table_first(tag);
976 if (first < 0)
977 return NULL;
978
979 for (i = first; ExifTagTable[i].name; i++) {
980 if (ExifTagTable[i].tag == tag) {
981 if (RECORDED)
982 break;
983 } else
984 return NULL; /* Recorded tag not found in the table */
985 }
986 /* FIXME: This belongs to somewhere else. */
987 /* libexif should use the default system locale.
988 * If an application specifically requires UTF-8, then we
989 * must give the application a way to tell libexif that.
990 *
991 * bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
992 */
993 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
994 return _(ExifTagTable[i].title);
995 }
996
997 const char *
exif_tag_get_description_in_ifd(ExifTag tag,ExifIfd ifd)998 exif_tag_get_description_in_ifd (ExifTag tag, ExifIfd ifd)
999 {
1000 unsigned int i;
1001 int first;
1002
1003 if (ifd >= EXIF_IFD_COUNT)
1004 return NULL;
1005 first = exif_tag_table_first(tag);
1006 if (first < 0)
1007 return NULL;
1008
1009 for (i = first; ExifTagTable[i].name; i++) {
1010 if (ExifTagTable[i].tag == tag) {
1011 if (RECORDED)
1012 break;
1013 } else
1014 return NULL; /* Recorded tag not found in the table */
1015 }
1016
1017 /* GNU gettext acts strangely when given an empty string */
1018 if (!ExifTagTable[i].description || !*ExifTagTable[i].description)
1019 return "";
1020
1021 /* libexif should use the default system locale.
1022 * If an application specifically requires UTF-8, then we
1023 * must give the application a way to tell libexif that.
1024 *
1025 * bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
1026 */
1027 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
1028 return _(ExifTagTable[i].description);
1029 }
1030
1031
1032 /**********************************************************************
1033 * convenience functions
1034 **********************************************************************/
1035
1036 /* generic part: iterate through IFD list and return first result */
1037 typedef const char * (*get_stuff_func) (ExifTag tag, ExifIfd ifd);
1038
1039 static const char *
exif_tag_get_stuff(ExifTag tag,get_stuff_func func)1040 exif_tag_get_stuff (ExifTag tag, get_stuff_func func)
1041 {
1042 /* Search IFDs in this order, in decreasing order of number of valid tags */
1043 static const ExifIfd ifds[EXIF_IFD_COUNT] = {
1044 EXIF_IFD_EXIF,
1045 EXIF_IFD_0,
1046 EXIF_IFD_1,
1047 EXIF_IFD_INTEROPERABILITY,
1048 EXIF_IFD_GPS
1049 };
1050 int i;
1051 for (i=0; i<EXIF_IFD_COUNT; i++) {
1052 const char *result = func(tag, ifds[i]);
1053 if (result != NULL) {
1054 return result;
1055 }
1056 }
1057 return (const char *) NULL;
1058 }
1059
1060 /* explicit functions */
1061 const char *
exif_tag_get_name(ExifTag tag)1062 exif_tag_get_name (ExifTag tag)
1063 {
1064 return exif_tag_get_stuff(tag, exif_tag_get_name_in_ifd);
1065 }
1066
1067 const char *
exif_tag_get_title(ExifTag tag)1068 exif_tag_get_title (ExifTag tag)
1069 {
1070 return exif_tag_get_stuff(tag, exif_tag_get_title_in_ifd);
1071 }
1072
1073 const char *
exif_tag_get_description(ExifTag tag)1074 exif_tag_get_description (ExifTag tag)
1075 {
1076 return exif_tag_get_stuff(tag, exif_tag_get_description_in_ifd);
1077 }
1078
1079
1080
1081 ExifTag
exif_tag_from_name(const char * name)1082 exif_tag_from_name (const char *name)
1083 {
1084 unsigned int i;
1085 unsigned int result=0;
1086
1087 if (!name) return 0;
1088
1089 for (i = 0; ExifTagTable[i].name; i++)
1090 if (!strcmp (ExifTagTable[i].name, name)) {
1091 result = ExifTagTable[i].tag;
1092 break;
1093 }
1094 return result;
1095 }
1096
1097 /*! Return the support level of a tag in the given IFD with the given data
1098 * type. If the tag is not specified in the EXIF standard, this function
1099 * returns EXIF_SUPPORT_LEVEL_NOT_RECORDED.
1100 *
1101 * \param[in] tag EXIF tag
1102 * \param[in] ifd a valid IFD (not EXIF_IFD_COUNT)
1103 * \param[in] t a valid data type (not EXIF_DATA_TYPE_UNKNOWN)
1104 * \return the level of support for this tag
1105 */
1106 static inline ExifSupportLevel
get_support_level_in_ifd(ExifTag tag,ExifIfd ifd,ExifDataType t)1107 get_support_level_in_ifd (ExifTag tag, ExifIfd ifd, ExifDataType t)
1108 {
1109 unsigned int i;
1110 int first = exif_tag_table_first(tag);
1111 if (first < 0)
1112 return EXIF_SUPPORT_LEVEL_NOT_RECORDED;
1113
1114 for (i = first; ExifTagTable[i].name; i++) {
1115 if (ExifTagTable[i].tag == tag) {
1116 const ExifSupportLevel supp = ExifTagTable[i].esl[ifd][t];
1117 if (supp != EXIF_SUPPORT_LEVEL_NOT_RECORDED)
1118 return supp;
1119 /* Try looking for another entry */
1120 } else {
1121 break; /* We've reached the end of the matching tags */
1122 }
1123 }
1124 return EXIF_SUPPORT_LEVEL_NOT_RECORDED;
1125 }
1126
1127 /*! Return the support level of a tag in the given IFD, regardless of the
1128 * data type. If the support level varies depending on the data type, this
1129 * function returns EXIF_SUPPORT_LEVEL_UNKNOWN. If the tag is not specified
1130 * in the EXIF standard, this function returns EXIF_SUPPORT_LEVEL_UNKNOWN.
1131 *
1132 * \param[in] tag EXIF tag
1133 * \param[in] ifd a valid IFD (not EXIF_IFD_COUNT)
1134 * \return the level of support for this tag
1135 */
1136 static inline ExifSupportLevel
get_support_level_any_type(ExifTag tag,ExifIfd ifd)1137 get_support_level_any_type (ExifTag tag, ExifIfd ifd)
1138 {
1139 unsigned int i;
1140 int first = exif_tag_table_first(tag);
1141 if (first < 0)
1142 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1143
1144 for (i = first; ExifTagTable[i].name; i++) {
1145 if (ExifTagTable[i].tag == tag) {
1146 /*
1147 * Check whether the support level is the same for all possible
1148 * data types and isn't marked not recorded.
1149 */
1150 const ExifSupportLevel supp = ExifTagTable[i].esl[ifd][0];
1151 /* If level is not recorded, keep searching for another */
1152 if (supp != EXIF_SUPPORT_LEVEL_NOT_RECORDED) {
1153 unsigned int dt;
1154 for (dt = 0; dt < EXIF_DATA_TYPE_COUNT; ++dt) {
1155 if (ExifTagTable[i].esl[ifd][dt] != supp)
1156 break;
1157 }
1158 if (dt == EXIF_DATA_TYPE_COUNT)
1159 /* Support level is always the same, so return it */
1160 return supp;
1161 }
1162 /* Keep searching the table for another tag for our IFD */
1163 } else {
1164 break; /* We've reached the end of the matching tags */
1165 }
1166 }
1167 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1168 }
1169
1170 ExifSupportLevel
exif_tag_get_support_level_in_ifd(ExifTag tag,ExifIfd ifd,ExifDataType t)1171 exif_tag_get_support_level_in_ifd (ExifTag tag, ExifIfd ifd, ExifDataType t)
1172 {
1173 if (ifd >= EXIF_IFD_COUNT)
1174 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1175
1176 if (t >= EXIF_DATA_TYPE_COUNT)
1177 return get_support_level_any_type (tag, ifd);
1178
1179 return get_support_level_in_ifd (tag, ifd, t);
1180 }
1181