| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * EXIF metadata parser | ||
| 3 | * Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * EXIF metadata parser | ||
| 25 | * @author Thilo Borgmann <thilo.borgmann _at_ mail.de> | ||
| 26 | */ | ||
| 27 | |||
| 28 | #include "exif.h" | ||
| 29 | #include "tiff_common.h" | ||
| 30 | |||
| 31 | #define EXIF_TAG_NAME_LENGTH 32 | ||
| 32 | |||
| 33 | struct exif_tag { | ||
| 34 | char name[EXIF_TAG_NAME_LENGTH]; | ||
| 35 | uint16_t id; | ||
| 36 | }; | ||
| 37 | |||
| 38 | static const struct exif_tag tag_list[] = { // JEITA CP-3451 EXIF specification: | ||
| 39 | {"GPSVersionID", 0x00}, // <- Table 12 GPS Attribute Information | ||
| 40 | {"GPSLatitudeRef", 0x01}, | ||
| 41 | {"GPSLatitude", 0x02}, | ||
| 42 | {"GPSLongitudeRef", 0x03}, | ||
| 43 | {"GPSLongitude", 0x04}, | ||
| 44 | {"GPSAltitudeRef", 0x05}, | ||
| 45 | {"GPSAltitude", 0x06}, | ||
| 46 | {"GPSTimeStamp", 0x07}, | ||
| 47 | {"GPSSatellites", 0x08}, | ||
| 48 | {"GPSStatus", 0x09}, | ||
| 49 | {"GPSMeasureMode", 0x0A}, | ||
| 50 | {"GPSDOP", 0x0B}, | ||
| 51 | {"GPSSpeedRef", 0x0C}, | ||
| 52 | {"GPSSpeed", 0x0D}, | ||
| 53 | {"GPSTrackRef", 0x0E}, | ||
| 54 | {"GPSTrack", 0x0F}, | ||
| 55 | {"GPSImgDirectionRef", 0x10}, | ||
| 56 | {"GPSImgDirection", 0x11}, | ||
| 57 | {"GPSMapDatum", 0x12}, | ||
| 58 | {"GPSDestLatitudeRef", 0x13}, | ||
| 59 | {"GPSDestLatitude", 0x14}, | ||
| 60 | {"GPSDestLongitudeRef", 0x15}, | ||
| 61 | {"GPSDestLongitude", 0x16}, | ||
| 62 | {"GPSDestBearingRef", 0x17}, | ||
| 63 | {"GPSDestBearing", 0x18}, | ||
| 64 | {"GPSDestDistanceRef", 0x19}, | ||
| 65 | {"GPSDestDistance", 0x1A}, | ||
| 66 | {"GPSProcessingMethod", 0x1B}, | ||
| 67 | {"GPSAreaInformation", 0x1C}, | ||
| 68 | {"GPSDateStamp", 0x1D}, | ||
| 69 | {"GPSDifferential", 0x1E}, | ||
| 70 | {"ImageWidth", 0x100}, // <- Table 3 TIFF Rev. 6.0 Attribute Information Used in Exif | ||
| 71 | {"ImageLength", 0x101}, | ||
| 72 | {"BitsPerSample", 0x102}, | ||
| 73 | {"Compression", 0x103}, | ||
| 74 | {"PhotometricInterpretation", 0x106}, | ||
| 75 | {"Orientation", 0x112}, | ||
| 76 | {"SamplesPerPixel", 0x115}, | ||
| 77 | {"PlanarConfiguration", 0x11C}, | ||
| 78 | {"YCbCrSubSampling", 0x212}, | ||
| 79 | {"YCbCrPositioning", 0x213}, | ||
| 80 | {"XResolution", 0x11A}, | ||
| 81 | {"YResolution", 0x11B}, | ||
| 82 | {"ResolutionUnit", 0x128}, | ||
| 83 | {"StripOffsets", 0x111}, | ||
| 84 | {"RowsPerStrip", 0x116}, | ||
| 85 | {"StripByteCounts", 0x117}, | ||
| 86 | {"JPEGInterchangeFormat", 0x201}, | ||
| 87 | {"JPEGInterchangeFormatLength",0x202}, | ||
| 88 | {"TransferFunction", 0x12D}, | ||
| 89 | {"WhitePoint", 0x13E}, | ||
| 90 | {"PrimaryChromaticities", 0x13F}, | ||
| 91 | {"YCbCrCoefficients", 0x211}, | ||
| 92 | {"ReferenceBlackWhite", 0x214}, | ||
| 93 | {"DateTime", 0x132}, | ||
| 94 | {"ImageDescription", 0x10E}, | ||
| 95 | {"Make", 0x10F}, | ||
| 96 | {"Model", 0x110}, | ||
| 97 | {"Software", 0x131}, | ||
| 98 | {"Artist", 0x13B}, | ||
| 99 | {"Copyright", 0x8298}, | ||
| 100 | {"ExifVersion", 0x9000}, // <- Table 4 Exif IFD Attribute Information (1) | ||
| 101 | {"FlashpixVersion", 0xA000}, | ||
| 102 | {"ColorSpace", 0xA001}, | ||
| 103 | {"ComponentsConfiguration", 0x9101}, | ||
| 104 | {"CompressedBitsPerPixel", 0x9102}, | ||
| 105 | {"PixelXDimension", 0xA002}, | ||
| 106 | {"PixelYDimension", 0xA003}, | ||
| 107 | {"MakerNote", 0x927C}, | ||
| 108 | {"UserComment", 0x9286}, | ||
| 109 | {"RelatedSoundFile", 0xA004}, | ||
| 110 | {"DateTimeOriginal", 0x9003}, | ||
| 111 | {"DateTimeDigitized", 0x9004}, | ||
| 112 | {"SubSecTime", 0x9290}, | ||
| 113 | {"SubSecTimeOriginal", 0x9291}, | ||
| 114 | {"SubSecTimeDigitized", 0x9292}, | ||
| 115 | {"ImageUniqueID", 0xA420}, | ||
| 116 | {"ExposureTime", 0x829A}, // <- Table 5 Exif IFD Attribute Information (2) | ||
| 117 | {"FNumber", 0x829D}, | ||
| 118 | {"ExposureProgram", 0x8822}, | ||
| 119 | {"SpectralSensitivity", 0x8824}, | ||
| 120 | {"ISOSpeedRatings", 0x8827}, | ||
| 121 | {"OECF", 0x8828}, | ||
| 122 | {"ShutterSpeedValue", 0x9201}, | ||
| 123 | {"ApertureValue", 0x9202}, | ||
| 124 | {"BrightnessValue", 0x9203}, | ||
| 125 | {"ExposureBiasValue", 0x9204}, | ||
| 126 | {"MaxApertureValue", 0x9205}, | ||
| 127 | {"SubjectDistance", 0x9206}, | ||
| 128 | {"MeteringMode", 0x9207}, | ||
| 129 | {"LightSource", 0x9208}, | ||
| 130 | {"Flash", 0x9209}, | ||
| 131 | {"FocalLength", 0x920A}, | ||
| 132 | {"SubjectArea", 0x9214}, | ||
| 133 | {"FlashEnergy", 0xA20B}, | ||
| 134 | {"SpatialFrequencyResponse", 0xA20C}, | ||
| 135 | {"FocalPlaneXResolution", 0xA20E}, | ||
| 136 | {"FocalPlaneYResolution", 0xA20F}, | ||
| 137 | {"FocalPlaneResolutionUnit", 0xA210}, | ||
| 138 | {"SubjectLocation", 0xA214}, | ||
| 139 | {"ExposureIndex", 0xA215}, | ||
| 140 | {"SensingMethod", 0xA217}, | ||
| 141 | {"FileSource", 0xA300}, | ||
| 142 | {"SceneType", 0xA301}, | ||
| 143 | {"CFAPattern", 0xA302}, | ||
| 144 | {"CustomRendered", 0xA401}, | ||
| 145 | {"ExposureMode", 0xA402}, | ||
| 146 | {"WhiteBalance", 0xA403}, | ||
| 147 | {"DigitalZoomRatio", 0xA404}, | ||
| 148 | {"FocalLengthIn35mmFilm", 0xA405}, | ||
| 149 | {"SceneCaptureType", 0xA406}, | ||
| 150 | {"GainControl", 0xA407}, | ||
| 151 | {"Contrast", 0xA408}, | ||
| 152 | {"Saturation", 0xA409}, | ||
| 153 | {"Sharpness", 0xA40A}, | ||
| 154 | {"DeviceSettingDescription", 0xA40B}, | ||
| 155 | {"SubjectDistanceRange", 0xA40C} | ||
| 156 | // {"InteroperabilityIndex", 0x1}, // <- Table 13 Interoperability IFD Attribute Information | ||
| 157 | }; | ||
| 158 | |||
| 159 | 232 | static const char *exif_get_tag_name(uint16_t id) | |
| 160 | { | ||
| 161 | int i; | ||
| 162 | |||
| 163 |
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17894 | for (i = 0; i < FF_ARRAY_ELEMS(tag_list); i++) { |
| 164 |
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17862 | if (tag_list[i].id == id) |
| 165 | 200 | return tag_list[i].name; | |
| 166 | } | ||
| 167 | |||
| 168 | 32 | return NULL; | |
| 169 | } | ||
| 170 | |||
| 171 | |||
| 172 | 232 | static int exif_add_metadata(void *logctx, int count, int type, | |
| 173 | const char *name, const char *sep, | ||
| 174 | GetByteContext *gb, int le, | ||
| 175 | AVDictionary **metadata) | ||
| 176 | { | ||
| 177 |
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232 | switch(type) { |
| 178 | ✗ | case 0: | |
| 179 | ✗ | av_log(logctx, AV_LOG_WARNING, | |
| 180 | "Invalid TIFF tag type 0 found for %s with size %d\n", | ||
| 181 | name, count); | ||
| 182 | ✗ | return 0; | |
| 183 | ✗ | case TIFF_DOUBLE : return ff_tadd_doubles_metadata(count, name, sep, gb, le, metadata); | |
| 184 | ✗ | case TIFF_SSHORT : return ff_tadd_shorts_metadata(count, name, sep, gb, le, 1, metadata); | |
| 185 | 74 | case TIFF_SHORT : return ff_tadd_shorts_metadata(count, name, sep, gb, le, 0, metadata); | |
| 186 | ✗ | case TIFF_SBYTE : return ff_tadd_bytes_metadata(count, name, sep, gb, le, 1, metadata); | |
| 187 | 36 | case TIFF_BYTE : | |
| 188 | 36 | case TIFF_UNDEFINED: return ff_tadd_bytes_metadata(count, name, sep, gb, le, 0, metadata); | |
| 189 | 46 | case TIFF_STRING : return ff_tadd_string_metadata(count, name, gb, le, metadata); | |
| 190 | 56 | case TIFF_SRATIONAL: | |
| 191 | 56 | case TIFF_RATIONAL : return ff_tadd_rational_metadata(count, name, sep, gb, le, metadata); | |
| 192 | 20 | case TIFF_SLONG : | |
| 193 | 20 | case TIFF_LONG : return ff_tadd_long_metadata(count, name, sep, gb, le, metadata); | |
| 194 | ✗ | default: | |
| 195 | ✗ | avpriv_request_sample(logctx, "TIFF tag type (%u)", type); | |
| 196 | ✗ | return 0; | |
| 197 | }; | ||
| 198 | } | ||
| 199 | |||
| 200 | |||
| 201 | 248 | static int exif_decode_tag(void *logctx, GetByteContext *gbytes, int le, | |
| 202 | int depth, AVDictionary **metadata) | ||
| 203 | { | ||
| 204 | int ret, cur_pos; | ||
| 205 | unsigned id, count; | ||
| 206 | enum TiffTypes type; | ||
| 207 | |||
| 208 |
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248 | if (depth > 2) { |
| 209 | ✗ | return 0; | |
| 210 | } | ||
| 211 | |||
| 212 | 248 | ff_tread_tag(gbytes, le, &id, &type, &count, &cur_pos); | |
| 213 | |||
| 214 |
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248 | if (!bytestream2_tell(gbytes)) { |
| 215 | ✗ | bytestream2_seek(gbytes, cur_pos, SEEK_SET); | |
| 216 | ✗ | return 0; | |
| 217 | } | ||
| 218 | |||
| 219 | // read count values and add it metadata | ||
| 220 | // store metadata or proceed with next IFD | ||
| 221 | 248 | ret = ff_tis_ifd(id); | |
| 222 |
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248 | if (ret) { |
| 223 | 16 | ret = ff_exif_decode_ifd(logctx, gbytes, le, depth + 1, metadata); | |
| 224 | } else { | ||
| 225 | 232 | const char *name = exif_get_tag_name(id); | |
| 226 | char buf[7]; | ||
| 227 | |||
| 228 |
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232 | if (!name) { |
| 229 | 32 | name = buf; | |
| 230 | 32 | snprintf(buf, sizeof(buf), "0x%04X", id); | |
| 231 | } | ||
| 232 | |||
| 233 | 232 | ret = exif_add_metadata(logctx, count, type, name, NULL, | |
| 234 | gbytes, le, metadata); | ||
| 235 | } | ||
| 236 | |||
| 237 | 248 | bytestream2_seek(gbytes, cur_pos, SEEK_SET); | |
| 238 | |||
| 239 | 248 | return ret; | |
| 240 | } | ||
| 241 | |||
| 242 | |||
| 243 | 36 | int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes, | |
| 244 | int le, int depth, AVDictionary **metadata) | ||
| 245 | { | ||
| 246 | int i, ret; | ||
| 247 | int entries; | ||
| 248 | |||
| 249 | 36 | entries = ff_tget_short(gbytes, le); | |
| 250 | |||
| 251 |
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36 | if (bytestream2_get_bytes_left(gbytes) < entries * 12) { |
| 252 | ✗ | return AVERROR_INVALIDDATA; | |
| 253 | } | ||
| 254 | |||
| 255 |
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284 | for (i = 0; i < entries; i++) { |
| 256 |
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248 | if ((ret = exif_decode_tag(logctx, gbytes, le, depth, metadata)) < 0) { |
| 257 | ✗ | return ret; | |
| 258 | } | ||
| 259 | } | ||
| 260 | |||
| 261 | // return next IDF offset or 0x000000000 or a value < 0 for failure | ||
| 262 | 36 | return ff_tget_long(gbytes, le); | |
| 263 | } | ||
| 264 | |||
| 265 | ✗ | int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size, | |
| 266 | int le, int depth, AVDictionary **metadata) | ||
| 267 | { | ||
| 268 | GetByteContext gb; | ||
| 269 | |||
| 270 | ✗ | bytestream2_init(&gb, buf, size); | |
| 271 | |||
| 272 | ✗ | return ff_exif_decode_ifd(logctx, &gb, le, depth, metadata); | |
| 273 | } | ||
| 274 |