Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

avcodec: Add EXIF metadata parser to libavcodec.

Browse Source 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
pull/37/head
Thilo Borgmann 12 years ago committed by Michael Niedermayer
parent b7ba7cbd6e
commit ad0f7574ef
3 changed files with 301 additions and 0 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 1
      MAINTAINERS
  2. 130
      libavcodec/exif.c
  3. 170
      libavcodec/exif.h

1
MAINTAINERS
Unescape View File

@ -153,6 +153,7 @@ Codecs:
dv.c Roman Shaposhnik
dxa.c Kostya Shishkov
eacmv*, eaidct*, eat* Peter Ross
exif.c, exif.h Thilo Borgmann
ffv1.c Michael Niedermayer
ffwavesynth.c Nicolas George
flac* Justin Ruggles

130
libavcodec/exif.c
Unescape View File

@ -0,0 +1,130 @@
/*
* EXIF metadata parser
* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*
* 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 <thilo.borgmann _at_ googlemail.com>
*/
#include "exif.h"
static const char *exif_get_tag_name(uint16_t id)
{
int i;
for (i = 0; i < FF_ARRAY_ELEMS(tag_list); i++) {
if (tag_list[i].id == id)
return tag_list[i].name;
}
return NULL;
}
static int exif_add_metadata(AVCodecContext *avctx, int count, int type,
const char *name, const char *sep,
GetByteContext *gb, int le,
AVDictionary **metadata)
{
switch(type) {
case TIFF_DOUBLE : return ff_tadd_doubles_metadata(count, name, sep, gb, le, metadata);
case TIFF_SHORT : return ff_tadd_shorts_metadata(count, name, sep, gb, le, metadata);
case TIFF_BYTE :
case TIFF_UNDEFINED:
case TIFF_STRING : return ff_tadd_string_metadata(count, name, gb, le, metadata);
case TIFF_SRATIONAL:
case TIFF_RATIONAL : return ff_tadd_rational_metadata(count, name, sep, gb, le, metadata);
case TIFF_SLONG :
case TIFF_LONG : return ff_tadd_long_metadata(count, name, sep, gb, le, metadata);
default:
avpriv_request_sample(avctx, "TIFF tag type (%u)", type);
return 0;
};
}
static int exif_decode_tag(AVCodecContext *avctx, GetByteContext *gbytes, int le,
int depth, AVDictionary **metadata)
{
int ret, cur_pos;
unsigned id, count;
enum TiffTypes type;
if (depth > 2) {
return 0;
}
ff_tread_tag(gbytes, le, &id, &type, &count, &cur_pos);
// read count values and add it metadata
// store metadata or proceed with next IFD
ret = ff_tis_ifd(id);
if (ret) {
ret = ff_exif_decode_ifd(avctx, gbytes, le, depth + 1, metadata);
} else {
const char *name = exif_get_tag_name(id);
char *use_name = (char*) name;
if (!use_name) {
use_name = av_malloc(7);
if (!use_name) {
return AVERROR(ENOMEM);
}
snprintf(use_name, 7, "0x%04X", id);
}
ret = exif_add_metadata(avctx, count, type, use_name, NULL,
gbytes, le, metadata);
if (!name) {
av_freep(&use_name);
}
}
bytestream2_seek(gbytes, cur_pos, SEEK_SET);
return ret;
}
int ff_exif_decode_ifd(AVCodecContext *avctx, GetByteContext *gbytes, int le,
int depth, AVDictionary **metadata)
{
int i, ret;
int entries;
entries = ff_tget_short(gbytes, le);
if (bytestream2_get_bytes_left(gbytes) < entries * 12) {
return AVERROR_INVALIDDATA;
}
for (i = 0; i < entries; i++) {
if ((ret = exif_decode_tag(avctx, gbytes, le, depth, metadata)) < 0) {
return ret;
}
}
// return next IDF offset or 0x000000000 or a value < 0 for failure
return ff_tget_long(gbytes, le);
}

170
libavcodec/exif.h
Unescape View File

@ -0,0 +1,170 @@
/*
* EXIF metadata parser
* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ googlemail.com>
*
* 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 <thilo.borgmann _at_ googlemail.com>
*/
#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 */
Write Preview
Loading…
Cancel
Save