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/*

 * EXIF metadata parser

 * Copyright (c) 2013 Thilo Borgmann 

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file

 * EXIF metadata parser

 * @author Thilo Borgmann 

 */

#ifndef AVCODEC_EXIF_H

#define AVCODEC_EXIF_H

#include "avcodec.h"

#include "bytestream.h"

#include "tiff.h"

#define EXIF_MAX_IFD_RECURSION 2

#define EXIF_TAG_NAME_LENGTH   32

struct exif_tag {

    char      name[EXIF_TAG_NAME_LENGTH];

    uint16_t  id;

};

static const struct exif_tag tag_list[] = { // JEITA CP-3451 EXIF specification:

    {"GPSVersionID",               0x00}, // <- Table 12 GPS Attribute Information

    {"GPSLatitudeRef",             0x01},

    {"GPSLatitude",                0x02},

    {"GPSLongitudeRef",            0x03},

    {"GPSLongitude",               0x04},

    {"GPSAltitudeRef",             0x05},

    {"GPSAltitude",                0x06},

    {"GPSTimeStamp",               0x07},

    {"GPSSatellites",              0x08},

    {"GPSStatus",                  0x09},

    {"GPSMeasureMode",             0x0A},

    {"GPSDOP",                     0x0B},

    {"GPSSpeedRef",                0x0C},

    {"GPSSpeed",                   0x0D},

    {"GPSTrackRef",                0x0E},

    {"GPSTrack",                   0x0F},

    {"GPSImgDirectionRef",         0x10},

    {"GPSImgDirection",            0x11},

    {"GPSMapDatum",                0x12},

    {"GPSDestLatitudeRef",         0x13},

    {"GPSDestLatitude",            0x14},

    {"GPSDestLongitudeRef",        0x15},

    {"GPSDestLongitude",           0x16},

    {"GPSDestBearingRef",          0x17},

    {"GPSDestBearing",             0x18},

    {"GPSDestDistanceRef",         0x19},

    {"GPSDestDistance",            0x1A},

    {"GPSProcessingMethod",        0x1B},

    {"GPSAreaInformation",         0x1C},

    {"GPSDateStamp",               0x1D},

    {"GPSDifferential",            0x1E},

    {"ImageWidth",                 0x100}, // <- Table 3 TIFF Rev. 6.0 Attribute Information Used in Exif

    {"ImageLength",                0x101},

    {"BitsPerSample",              0x102},

    {"Compression",                0x103},

    {"PhotometricInterpretation",  0x106},

    {"Orientation",                0x112},

    {"SamplesPerPixel",            0x115},

    {"PlanarConfiguration",        0x11C},

    {"YCbCrSubSampling",           0x212},

    {"YCbCrPositioning",           0x213},

    {"XResolution",                0x11A},

    {"YResolution",                0x11B},

    {"ResolutionUnit",             0x128},

    {"StripOffsets",               0x111},

    {"RowsPerStrip",               0x116},

    {"StripByteCounts",            0x117},

    {"JPEGInterchangeFormat",      0x201},

    {"JPEGInterchangeFormatLength",0x202},

    {"TransferFunction",           0x12D},

    {"WhitePoint",                 0x13E},

    {"PrimaryChromaticities",      0x13F},

    {"YCbCrCoefficients",          0x211},

    {"ReferenceBlackWhite",        0x214},

    {"DateTime",                   0x132},

    {"ImageDescription",           0x10E},

    {"Make",                       0x10F},

    {"Model",                      0x110},

    {"Software",                   0x131},

    {"Artist",                     0x13B},

    {"Copyright",                  0x8298},

    {"ExifVersion",                0x9000}, // <- Table 4 Exif IFD Attribute Information (1)

    {"FlashpixVersion",            0xA000},

    {"ColorSpace",                 0xA001},

    {"ComponentsConfiguration",    0x9101},

    {"CompressedBitsPerPixel",     0x9102},

    {"PixelXDimension",            0xA002},

    {"PixelYDimension",            0xA003},

    {"MakerNote",                  0x927C},

    {"UserComment",                0x9286},

    {"RelatedSoundFile",           0xA004},

    {"DateTimeOriginal",           0x9003},

    {"DateTimeDigitized",          0x9004},

    {"SubSecTime",                 0x9290},

    {"SubSecTimeOriginal",         0x9291},

    {"SubSecTimeDigitized",        0x9292},

    {"ImageUniqueID",              0xA420},

    {"ExposureTime",               0x829A}, // <- Table 5 Exif IFD Attribute Information (2)

    {"FNumber",                    0x829D},

    {"ExposureProgram",            0x8822},

    {"SpectralSensitivity",        0x8824},

    {"ISOSpeedRatings",            0x8827},

    {"OECF",                       0x8828},

    {"ShutterSpeedValue",          0x9201},

    {"ApertureValue",              0x9202},

    {"BrightnessValue",            0x9203},

    {"ExposureBiasValue",          0x9204},

    {"MaxApertureValue",           0x9205},

    {"SubjectDistance",            0x9206},

    {"MeteringMode",               0x9207},

    {"LightSource",                0x9208},

    {"Flash",                      0x9209},

    {"FocalLength",                0x920A},

    {"SubjectArea",                0x9214},

    {"FlashEnergy",                0xA20B},

    {"SpatialFrequencyResponse",   0xA20C},

    {"FocalPlaneXResolution",      0xA20E},

    {"FocalPlaneYResolution",      0xA20F},

    {"FocalPlaneResolutionUnit",   0xA210},

    {"SubjectLocation",            0xA214},

    {"ExposureIndex",              0xA215},

    {"SensingMethod",              0xA217},

    {"FileSource",                 0xA300},

    {"SceneType",                  0xA301},

    {"CFAPattern",                 0xA302},

    {"CustomRendered",             0xA401},

    {"ExposureMode",               0xA402},

    {"WhiteBalance",               0xA403},

    {"DigitalZoomRatio",           0xA404},

    {"FocalLengthIn35mmFilm",      0xA405},

    {"SceneCaptureType",           0xA406},

    {"GainControl",                0xA407},

    {"Contrast",                   0xA408},

    {"Saturation",                 0xA409},

    {"Sharpness",                  0xA40A},

    {"DeviceSettingDescription",   0xA40B},

    {"SubjectDistanceRange",       0xA40C}

//    {"InteroperabilityIndex",      0x1}, // <- Table 13 Interoperability IFD Attribute Information

//    {"",                           0x0}

};

/** Recursively decodes all IFD's and

 *  adds included TAGS into the metadata dictionary. */

int ff_exif_decode_ifd(AVCodecContext *avctx, GetByteContext *gbytes, int le,

                       int depth, AVDictionary **metadata);

#endif /* AVCODEC_EXIF_H */