FFmpeg
exif.h
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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 #ifndef AVCODEC_EXIF_H
29 #define AVCODEC_EXIF_H
30 
31 #include "avcodec.h"
32 #include "bytestream.h"
33 #include "tiff.h"
34 
35 #define EXIF_MAX_IFD_RECURSION 2
36 #define EXIF_TAG_NAME_LENGTH 32
37 
38 struct exif_tag {
40  uint16_t id;
41 };
42 
43 static const struct exif_tag tag_list[] = { // JEITA CP-3451 EXIF specification:
44  {"GPSVersionID", 0x00}, // <- Table 12 GPS Attribute Information
45  {"GPSLatitudeRef", 0x01},
46  {"GPSLatitude", 0x02},
47  {"GPSLongitudeRef", 0x03},
48  {"GPSLongitude", 0x04},
49  {"GPSAltitudeRef", 0x05},
50  {"GPSAltitude", 0x06},
51  {"GPSTimeStamp", 0x07},
52  {"GPSSatellites", 0x08},
53  {"GPSStatus", 0x09},
54  {"GPSMeasureMode", 0x0A},
55  {"GPSDOP", 0x0B},
56  {"GPSSpeedRef", 0x0C},
57  {"GPSSpeed", 0x0D},
58  {"GPSTrackRef", 0x0E},
59  {"GPSTrack", 0x0F},
60  {"GPSImgDirectionRef", 0x10},
61  {"GPSImgDirection", 0x11},
62  {"GPSMapDatum", 0x12},
63  {"GPSDestLatitudeRef", 0x13},
64  {"GPSDestLatitude", 0x14},
65  {"GPSDestLongitudeRef", 0x15},
66  {"GPSDestLongitude", 0x16},
67  {"GPSDestBearingRef", 0x17},
68  {"GPSDestBearing", 0x18},
69  {"GPSDestDistanceRef", 0x19},
70  {"GPSDestDistance", 0x1A},
71  {"GPSProcessingMethod", 0x1B},
72  {"GPSAreaInformation", 0x1C},
73  {"GPSDateStamp", 0x1D},
74  {"GPSDifferential", 0x1E},
75  {"ImageWidth", 0x100}, // <- Table 3 TIFF Rev. 6.0 Attribute Information Used in Exif
76  {"ImageLength", 0x101},
77  {"BitsPerSample", 0x102},
78  {"Compression", 0x103},
79  {"PhotometricInterpretation", 0x106},
80  {"Orientation", 0x112},
81  {"SamplesPerPixel", 0x115},
82  {"PlanarConfiguration", 0x11C},
83  {"YCbCrSubSampling", 0x212},
84  {"YCbCrPositioning", 0x213},
85  {"XResolution", 0x11A},
86  {"YResolution", 0x11B},
87  {"ResolutionUnit", 0x128},
88  {"StripOffsets", 0x111},
89  {"RowsPerStrip", 0x116},
90  {"StripByteCounts", 0x117},
91  {"JPEGInterchangeFormat", 0x201},
92  {"JPEGInterchangeFormatLength",0x202},
93  {"TransferFunction", 0x12D},
94  {"WhitePoint", 0x13E},
95  {"PrimaryChromaticities", 0x13F},
96  {"YCbCrCoefficients", 0x211},
97  {"ReferenceBlackWhite", 0x214},
98  {"DateTime", 0x132},
99  {"ImageDescription", 0x10E},
100  {"Make", 0x10F},
101  {"Model", 0x110},
102  {"Software", 0x131},
103  {"Artist", 0x13B},
104  {"Copyright", 0x8298},
105  {"ExifVersion", 0x9000}, // <- Table 4 Exif IFD Attribute Information (1)
106  {"FlashpixVersion", 0xA000},
107  {"ColorSpace", 0xA001},
108  {"ComponentsConfiguration", 0x9101},
109  {"CompressedBitsPerPixel", 0x9102},
110  {"PixelXDimension", 0xA002},
111  {"PixelYDimension", 0xA003},
112  {"MakerNote", 0x927C},
113  {"UserComment", 0x9286},
114  {"RelatedSoundFile", 0xA004},
115  {"DateTimeOriginal", 0x9003},
116  {"DateTimeDigitized", 0x9004},
117  {"SubSecTime", 0x9290},
118  {"SubSecTimeOriginal", 0x9291},
119  {"SubSecTimeDigitized", 0x9292},
120  {"ImageUniqueID", 0xA420},
121  {"ExposureTime", 0x829A}, // <- Table 5 Exif IFD Attribute Information (2)
122  {"FNumber", 0x829D},
123  {"ExposureProgram", 0x8822},
124  {"SpectralSensitivity", 0x8824},
125  {"ISOSpeedRatings", 0x8827},
126  {"OECF", 0x8828},
127  {"ShutterSpeedValue", 0x9201},
128  {"ApertureValue", 0x9202},
129  {"BrightnessValue", 0x9203},
130  {"ExposureBiasValue", 0x9204},
131  {"MaxApertureValue", 0x9205},
132  {"SubjectDistance", 0x9206},
133  {"MeteringMode", 0x9207},
134  {"LightSource", 0x9208},
135  {"Flash", 0x9209},
136  {"FocalLength", 0x920A},
137  {"SubjectArea", 0x9214},
138  {"FlashEnergy", 0xA20B},
139  {"SpatialFrequencyResponse", 0xA20C},
140  {"FocalPlaneXResolution", 0xA20E},
141  {"FocalPlaneYResolution", 0xA20F},
142  {"FocalPlaneResolutionUnit", 0xA210},
143  {"SubjectLocation", 0xA214},
144  {"ExposureIndex", 0xA215},
145  {"SensingMethod", 0xA217},
146  {"FileSource", 0xA300},
147  {"SceneType", 0xA301},
148  {"CFAPattern", 0xA302},
149  {"CustomRendered", 0xA401},
150  {"ExposureMode", 0xA402},
151  {"WhiteBalance", 0xA403},
152  {"DigitalZoomRatio", 0xA404},
153  {"FocalLengthIn35mmFilm", 0xA405},
154  {"SceneCaptureType", 0xA406},
155  {"GainControl", 0xA407},
156  {"Contrast", 0xA408},
157  {"Saturation", 0xA409},
158  {"Sharpness", 0xA40A},
159  {"DeviceSettingDescription", 0xA40B},
160  {"SubjectDistanceRange", 0xA40C}
161 // {"InteroperabilityIndex", 0x1}, // <- Table 13 Interoperability IFD Attribute Information
162 // {"", 0x0}
163 };
164 
165 /** Recursively decodes all IFD's and
166  * adds included TAGS into the metadata dictionary. */
167 int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size,
168  int le, int depth, AVDictionary **metadata);
169 
170 int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le,
171  int depth, AVDictionary **metadata);
172 
173 #endif /* AVCODEC_EXIF_H */
static const struct exif_tag tag_list[]
Definition: exif.h:43
TIFF constants & data structures.
uint8_t
#define EXIF_TAG_NAME_LENGTH
Definition: exif.h:36
int ff_exif_decode_ifd(void *logctx, GetByteContext *gbytes, int le, int depth, AVDictionary **metadata)
Definition: exif.c:122
ptrdiff_t size
Definition: opengl_enc.c:100
Libavcodec external API header.
void * buf
Definition: avisynth_c.h:766
uint16_t id
Definition: exif.h:40
int avpriv_exif_decode_ifd(void *logctx, const uint8_t *buf, int size, int le, int depth, AVDictionary **metadata)
Recursively decodes all IFD&#39;s and adds included TAGS into the metadata dictionary.
Definition: exif.c:144
const char * name
Definition: opengl_enc.c:102
Definition: exif.h:38