EXIF library (libexif) API 0.6.24

Macros | Enumerations | Functions
exif-tag.h File Reference

Handling EXIF tags. More...

`#include <libexif/exif-ifd.h>`
`#include <libexif/exif-data-type.h>`

Go to the source code of this file.

## Macros
#define | EXIF_TAG_GPS_VERSION_ID 0x0000
#define | EXIF_TAG_GPS_LATITUDE_REF 0x0001 /* INTEROPERABILITY_INDEX */
#define | EXIF_TAG_GPS_LATITUDE 0x0002 /* INTEROPERABILITY_VERSION */
#define | EXIF_TAG_GPS_LONGITUDE_REF 0x0003
#define | EXIF_TAG_GPS_LONGITUDE 0x0004
#define | EXIF_TAG_GPS_ALTITUDE_REF 0x0005
#define | EXIF_TAG_GPS_ALTITUDE 0x0006
#define | EXIF_TAG_GPS_TIME_STAMP 0x0007
#define | EXIF_TAG_GPS_SATELLITES 0x0008
#define | EXIF_TAG_GPS_STATUS 0x0009
#define | EXIF_TAG_GPS_MEASURE_MODE 0x000a
#define | EXIF_TAG_GPS_DOP 0x000b
#define | EXIF_TAG_GPS_SPEED_REF 0x000c
#define | EXIF_TAG_GPS_SPEED 0x000d
#define | EXIF_TAG_GPS_TRACK_REF 0x000e
#define | EXIF_TAG_GPS_TRACK 0x000f
#define | EXIF_TAG_GPS_IMG_DIRECTION_REF 0x0010
#define | EXIF_TAG_GPS_IMG_DIRECTION 0x0011
#define | EXIF_TAG_GPS_MAP_DATUM 0x0012
#define | EXIF_TAG_GPS_DEST_LATITUDE_REF 0x0013
#define | EXIF_TAG_GPS_DEST_LATITUDE 0x0014
#define | EXIF_TAG_GPS_DEST_LONGITUDE_REF 0x0015
#define | EXIF_TAG_GPS_DEST_LONGITUDE 0x0016
#define | EXIF_TAG_GPS_DEST_BEARING_REF 0x0017
#define | EXIF_TAG_GPS_DEST_BEARING 0x0018
#define | EXIF_TAG_GPS_DEST_DISTANCE_REF 0x0019
#define | EXIF_TAG_GPS_DEST_DISTANCE 0x001a
#define | EXIF_TAG_GPS_PROCESSING_METHOD 0x001b
#define | EXIF_TAG_GPS_AREA_INFORMATION 0x001c
#define | EXIF_TAG_GPS_DATE_STAMP 0x001d
#define | EXIF_TAG_GPS_DIFFERENTIAL 0x001e
#define | EXIF_TAG_GPS_H_POSITIONING_ERROR 0x001f
#define | EXIF_TAG_UNKNOWN_C4A5 EXIF_TAG_PRINT_IMAGE_MATCHING

## Enumerations
enum | ExifTag { EXIF_TAG_INTEROPERABILITY_INDEX = 0x0001 , EXIF_TAG_INTEROPERABILITY_VERSION = 0x0002 , EXIF_TAG_NEW_SUBFILE_TYPE = 0x00fe , EXIF_TAG_IMAGE_WIDTH = 0x0100 , EXIF_TAG_IMAGE_LENGTH = 0x0101 , EXIF_TAG_BITS_PER_SAMPLE = 0x0102 , EXIF_TAG_COMPRESSION = 0x0103 , EXIF_TAG_PHOTOMETRIC_INTERPRETATION = 0x0106 , EXIF_TAG_FILL_ORDER = 0x010a , EXIF_TAG_DOCUMENT_NAME = 0x010d , EXIF_TAG_IMAGE_DESCRIPTION = 0x010e , EXIF_TAG_MAKE = 0x010f , EXIF_TAG_MODEL = 0x0110 , EXIF_TAG_STRIP_OFFSETS = 0x0111 , EXIF_TAG_ORIENTATION = 0x0112 , EXIF_TAG_SAMPLES_PER_PIXEL = 0x0115 , EXIF_TAG_ROWS_PER_STRIP = 0x0116 , EXIF_TAG_STRIP_BYTE_COUNTS = 0x0117 , EXIF_TAG_X_RESOLUTION = 0x011a , EXIF_TAG_Y_RESOLUTION = 0x011b , EXIF_TAG_PLANAR_CONFIGURATION = 0x011c , EXIF_TAG_RESOLUTION_UNIT = 0x0128 , EXIF_TAG_TRANSFER_FUNCTION = 0x012d , EXIF_TAG_SOFTWARE = 0x0131 , EXIF_TAG_DATE_TIME = 0x0132 , EXIF_TAG_ARTIST = 0x013b , EXIF_TAG_WHITE_POINT = 0x013e , EXIF_TAG_PRIMARY_CHROMATICITIES = 0x013f , EXIF_TAG_SUB_IFDS = 0x014a , EXIF_TAG_TRANSFER_RANGE = 0x0156 , EXIF_TAG_JPEG_PROC = 0x0200 , EXIF_TAG_JPEG_INTERCHANGE_FORMAT = 0x0201 , EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH = 0x0202 , EXIF_TAG_YCBCR_COEFFICIENTS = 0x0211 , EXIF_TAG_YCBCR_SUB_SAMPLING = 0x0212 , EXIF_TAG_YCBCR_POSITIONING = 0x0213 , EXIF_TAG_REFERENCE_BLACK_WHITE = 0x0214 , EXIF_TAG_XML_PACKET = 0x02bc , EXIF_TAG_RELATED_IMAGE_FILE_FORMAT = 0x1000 , EXIF_TAG_RELATED_IMAGE_WIDTH = 0x1001 , EXIF_TAG_RELATED_IMAGE_LENGTH = 0x1002 , EXIF_TAG_IMAGE_DEPTH = 0x80e5 , EXIF_TAG_CFA_REPEAT_PATTERN_DIM = 0x828d , EXIF_TAG_CFA_PATTERN = 0x828e , EXIF_TAG_BATTERY_LEVEL = 0x828f , EXIF_TAG_COPYRIGHT = 0x8298 , EXIF_TAG_EXPOSURE_TIME = 0x829a , EXIF_TAG_FNUMBER = 0x829d , EXIF_TAG_IPTC_NAA = 0x83bb , EXIF_TAG_IMAGE_RESOURCES = 0x8649 , EXIF_TAG_EXIF_IFD_POINTER = 0x8769 , EXIF_TAG_INTER_COLOR_PROFILE = 0x8773 , EXIF_TAG_EXPOSURE_PROGRAM = 0x8822 , EXIF_TAG_SPECTRAL_SENSITIVITY = 0x8824 , EXIF_TAG_GPS_INFO_IFD_POINTER = 0x8825 , EXIF_TAG_ISO_SPEED_RATINGS = 0x8827 , EXIF_TAG_OECF = 0x8828 , EXIF_TAG_TIME_ZONE_OFFSET = 0x882a , EXIF_TAG_SENSITIVITY_TYPE = 0x8830 , EXIF_TAG_STANDARD_OUTPUT_SENSITIVITY = 0x8831 , EXIF_TAG_RECOMMENDED_EXPOSURE_INDEX = 0x8832 , EXIF_TAG_ISO_SPEED = 0x8833 , EXIF_TAG_ISO_SPEEDLatitudeYYY = 0x8834 , EXIF_TAG_ISO_SPEEDLatitudeZZZ = 0x8835 , EXIF_TAG_EXIF_VERSION = 0x9000 , EXIF_TAG_DATE_TIME_ORIGINAL = 0x9003 , EXIF_TAG_DATE_TIME_DIGITIZED = 0x9004 , EXIF_TAG_OFFSET_TIME = 0x9010 , EXIF_TAG_OFFSET_TIME_ORIGINAL = 0x9011 , EXIF_TAG_OFFSET_TIME_DIGITIZED = 0x9012 , EXIF_TAG_COMPONENTS_CONFIGURATION = 0x9101 , EXIF_TAG_COMPRESSED_BITS_PER_PIXEL = 0x9102 , EXIF_TAG_SHUTTER_SPEED_VALUE = 0x9201 , EXIF_TAG_APERTURE_VALUE = 0x9202 , EXIF_TAG_BRIGHTNESS_VALUE = 0x9203 , EXIF_TAG_EXPOSURE_BIAS_VALUE = 0x9204 , EXIF_TAG_MAX_APERTURE_VALUE = 0x9205 , EXIF_TAG_SUBJECT_DISTANCE = 0x9206 , EXIF_TAG_METERING_MODE = 0x9207 , EXIF_TAG_LIGHT_SOURCE = 0x9208 , EXIF_TAG_FLASH = 0x9209 , EXIF_TAG_FOCAL_LENGTH = 0x920a , EXIF_TAG_SUBJECT_AREA = 0x9214 , EXIF_TAG_TIFF_EP_STANDARD_ID = 0x9216 , EXIF_TAG_MAKER_NOTE = 0x927c , EXIF_TAG_USER_COMMENT = 0x9286 , EXIF_TAG_SUB_SEC_TIME = 0x9290 , EXIF_TAG_SUB_SEC_TIME_ORIGINAL = 0x9291 , EXIF_TAG_SUB_SEC_TIME_DIGITIZED = 0x9292 , EXIF_TAG_XP_TITLE = 0x9c9b , EXIF_TAG_XP_COMMENT = 0x9c9c , EXIF_TAG_XP_AUTHOR = 0x9c9d , EXIF_TAG_XP_KEYWORDS = 0x9c9e , EXIF_TAG_XP_SUBJECT = 0x9c9f , EXIF_TAG_FLASH_PIX_VERSION = 0xa000 , EXIF_TAG_COLOR_SPACE = 0xa001 , EXIF_TAG_PIXEL_X_DIMENSION = 0xa002 , EXIF_TAG_PIXEL_Y_DIMENSION = 0xa003 , EXIF_TAG_RELATED_SOUND_FILE = 0xa004 , EXIF_TAG_INTEROPERABILITY_IFD_POINTER = 0xa005 , EXIF_TAG_FLASH_ENERGY = 0xa20b , EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE = 0xa20c , EXIF_TAG_FOCAL_PLANE_X_RESOLUTION = 0xa20e , EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION = 0xa20f , EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT = 0xa210 , EXIF_TAG_SUBJECT_LOCATION = 0xa214 , EXIF_TAG_EXPOSURE_INDEX = 0xa215 , EXIF_TAG_SENSING_METHOD = 0xa217 , EXIF_TAG_FILE_SOURCE = 0xa300 , EXIF_TAG_SCENE_TYPE = 0xa301 , EXIF_TAG_NEW_CFA_PATTERN = 0xa302 , EXIF_TAG_CUSTOM_RENDERED = 0xa401 , EXIF_TAG_EXPOSURE_MODE = 0xa402 , EXIF_TAG_WHITE_BALANCE = 0xa403 , EXIF_TAG_DIGITAL_ZOOM_RATIO = 0xa404 , EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM = 0xa405 , EXIF_TAG_SCENE_CAPTURE_TYPE = 0xa406 , EXIF_TAG_GAIN_CONTROL = 0xa407 , EXIF_TAG_CONTRAST = 0xa408 , EXIF_TAG_SATURATION = 0xa409 , EXIF_TAG_SHARPNESS = 0xa40a , EXIF_TAG_DEVICE_SETTING_DESCRIPTION = 0xa40b , EXIF_TAG_SUBJECT_DISTANCE_RANGE = 0xa40c , EXIF_TAG_IMAGE_UNIQUE_ID = 0xa420 , EXIF_TAG_CAMERA_OWNER_NAME = 0xa430 , EXIF_TAG_BODY_SERIAL_NUMBER = 0xa431 , EXIF_TAG_LENS_SPECIFICATION = 0xa432 , EXIF_TAG_LENS_MAKE = 0xa433 , EXIF_TAG_LENS_MODEL = 0xa434 , EXIF_TAG_LENS_SERIAL_NUMBER = 0xa435 , EXIF_TAG_COMPOSITE_IMAGE = 0xa460 , EXIF_TAG_SOURCE_IMAGE_NUMBER_OF_COMPOSITE_IMAGE = 0xa461 , EXIF_TAG_SOURCE_EXPOSURE_TIMES_OF_COMPOSITE_IMAGE = 0xa462 , EXIF_TAG_GAMMA = 0xa500 , EXIF_TAG_PRINT_IMAGE_MATCHING = 0xc4a5 , EXIF_TAG_PADDING = 0xea1c }
| EXIF tags.
enum | ExifSupportLevel { EXIF_SUPPORT_LEVEL_UNKNOWN = 0 , EXIF_SUPPORT_LEVEL_NOT_RECORDED , EXIF_SUPPORT_LEVEL_MANDATORY , EXIF_SUPPORT_LEVEL_OPTIONAL }
| What level of support a tag enjoys in the EXIF standard. More...

## Functions
ExifTag | exif_tag_from_name (const char *name)
| Return the tag ID given its unique textual name. More...
const char * | exif_tag_get_name_in_ifd (ExifTag tag, ExifIfd ifd)
| Return a textual name of the given tag when found in the given IFD. More...
const char * | exif_tag_get_title_in_ifd (ExifTag tag, ExifIfd ifd)
| Return a textual title of the given tag when found in the given IFD. More...
const char * | exif_tag_get_description_in_ifd (ExifTag tag, ExifIfd ifd)
| Return a verbose textual description of the given tag when found in the given IFD. More...
ExifSupportLevel | exif_tag_get_support_level_in_ifd (ExifTag tag, ExifIfd ifd, ExifDataType t)
| Return whether the given tag is mandatory or not in the given IFD and data type according to the EXIF specification. More...
const char * | exif_tag_get_name (ExifTag tag)
const char * | exif_tag_get_title (ExifTag tag)
const char * | exif_tag_get_description (ExifTag tag)
ExifTag | exif_tag_table_get_tag (unsigned int n)
const char * | exif_tag_table_get_name (unsigned int n)
unsigned int | exif_tag_table_count (void)
| Return the number of entries in the EXIF tag table, including the terminating NULL entry.

## Detailed Description

Handling EXIF tags.

## Macro Definition Documentation

## ◆ EXIF_TAG_UNKNOWN_C4A5

#define EXIF_TAG_UNKNOWN_C4A5 EXIF_TAG_PRINT_IMAGE_MATCHING

Deprecated:
  Use EXIF_TAG_PRINT_IMAGE_MATCHING instead.

## Enumeration Type Documentation

## ◆ ExifSupportLevel

enum ExifSupportLevel

What level of support a tag enjoys in the EXIF standard.

Enumerator
EXIF_SUPPORT_LEVEL_UNKNOWN | The meaning of this tag is unknown.
EXIF_SUPPORT_LEVEL_NOT_RECORDED | This tag is not allowed in the given IFD.
EXIF_SUPPORT_LEVEL_MANDATORY | This tag is mandatory in the given IFD.
EXIF_SUPPORT_LEVEL_OPTIONAL | This tag is optional in the given IFD.

## Function Documentation

## ◆ exif_tag_from_name()

ExifTag exif_tag_from_name | ( | const char * | name | ) |

Return the tag ID given its unique textual name.

Parameters

  [in] | name | tag name

Returns
  tag ID, or 0 if tag not found

Note
  The tag not found value cannot be distinguished from a legitimate tag number 0.

## ◆ exif_tag_get_description()

const char * exif_tag_get_description | ( | ExifTag | tag | ) |

Deprecated:
  Use exif_tag_get_description_in_ifd instead

References exif_tag_get_description_in_ifd().

## ◆ exif_tag_get_description_in_ifd()

const char * exif_tag_get_description_in_ifd | ( | ExifTag | tag,
|  | ExifIfd | ifd
| ) |  |

Return a verbose textual description of the given tag when found in the given IFD.

The description is a verbose, localized description of the tag.

Parameters

  [in] | tag | EXIF tag
  [in] | ifd | IFD

Returns
  textual description of the tag, or NULL if the tag is unknown

Referenced by exif_tag_get_description().

## ◆ exif_tag_get_name()

const char * exif_tag_get_name | ( | ExifTag | tag | ) |

Deprecated:
  Use exif_tag_get_name_in_ifd instead

References exif_tag_get_name_in_ifd().

## ◆ exif_tag_get_name_in_ifd()

const char * exif_tag_get_name_in_ifd | ( | ExifTag | tag,
|  | ExifIfd | ifd
| ) |  |

Return a textual name of the given tag when found in the given IFD.

The name is a short, unique, non-localized text string containing only US-ASCII alphanumeric characters.

Parameters

  [in] | tag | EXIF tag
  [in] | ifd | IFD

Returns
  textual name of the tag, or NULL if the tag is unknown

Referenced by exif_tag_get_name().

## ◆ exif_tag_get_support_level_in_ifd()

ExifSupportLevel exif_tag_get_support_level_in_ifd | ( | ExifTag | tag,
|  | ExifIfd | ifd,
|  | ExifDataType | t
| ) |  |

Return whether the given tag is mandatory or not in the given IFD and data type according to the EXIF specification.

If the IFD given is EXIF_IFD_COUNT, the result is EXIF_SUPPORT_LEVEL_UNKNOWN. If the data type is EXIF_DATA_TYPE_UNKNOWN, the result is EXIF_SUPPORT_LEVEL_UNKNOWN unless the support level is the same for all data types.

Parameters

  [in] | tag | EXIF tag
  [in] | ifd | IFD or EXIF_IFD_COUNT
  [in] | t | data type or EXIF_DATA_TYPE_UNKNOWN

Returns
  the level of support for this tag

References EXIF_SUPPORT_LEVEL_UNKNOWN.

## ◆ exif_tag_get_title()

const char * exif_tag_get_title | ( | ExifTag | tag | ) |

Deprecated:
  Use exif_tag_get_title_in_ifd instead

References exif_tag_get_title_in_ifd().

## ◆ exif_tag_get_title_in_ifd()

const char * exif_tag_get_title_in_ifd | ( | ExifTag | tag,
|  | ExifIfd | ifd
| ) |  |

Return a textual title of the given tag when found in the given IFD.

The title is a short, localized description of the tag.

Parameters

  [in] | tag | EXIF tag
  [in] | ifd | IFD

Returns
  textual title of the tag, or NULL if the tag is unknown

Referenced by exif_tag_get_title().