tiff_common.h File Reference

#include <stdint.h>
#include "libavutil/dict.h"
#include "bytestream.h"

Go to the source code of this file.

Enumerations
enum	TiffTypes {   TIFF_BYTE = 1, TIFF_STRING, TIFF_SHORT, TIFF_LONG,   TIFF_RATIONAL, TIFF_SBYTE, TIFF_UNDEFINED, TIFF_SSHORT,   TIFF_SLONG, TIFF_SRATIONAL, TIFF_FLOAT, TIFF_DOUBLE,   TIFF_IFD }
	data type identifiers for TIFF tags More...

Functions
int	ff_tis_ifd (unsigned tag)
	Returns a value > 0 if the tag is a known IFD-tag. More...
unsigned	ff_tget_short (GetByteContext *gb, int le)
	Reads a short from the bytestream using given endianness. More...
unsigned	ff_tget_long (GetByteContext *gb, int le)
	Reads a long from the bytestream using given endianness. More...
double	ff_tget_double (GetByteContext *gb, int le)
	Reads a double from the bytestream using given endianness. More...
unsigned	ff_tget (GetByteContext *gb, int type, int le)
	Reads a byte from the bytestream using given endianness. More...
int	ff_tadd_rational_metadata (int count, const char *name, const char *sep, GetByteContext *gb, int le, AVDictionary **metadata)
	Adds count rationals converted to a string into the metadata dictionary. More...
int	ff_tadd_long_metadata (int count, const char *name, const char *sep, GetByteContext *gb, int le, AVDictionary **metadata)
	Adds count longs converted to a string into the metadata dictionary. More...
int	ff_tadd_doubles_metadata (int count, const char *name, const char *sep, GetByteContext *gb, int le, AVDictionary **metadata)
	Adds count doubles converted to a string into the metadata dictionary. More...
int	ff_tadd_shorts_metadata (int count, const char *name, const char *sep, GetByteContext *gb, int le, int is_signed, AVDictionary **metadata)
	Adds count shorts converted to a string into the metadata dictionary. More...
int	ff_tadd_bytes_metadata (int count, const char *name, const char *sep, GetByteContext *gb, int le, int is_signed, AVDictionary **metadata)
	Adds count bytes converted to a string into the metadata dictionary. More...
int	ff_tadd_string_metadata (int count, const char *name, GetByteContext *gb, int le, AVDictionary **metadata)
	Adds a string of count characters into the metadata dictionary. More...
int	ff_tdecode_header (GetByteContext *gb, int *le, int *ifd_offset)
	Decodes a TIFF header from the input bytestream and sets the endianness in *le and the offset to the first IFD in *ifd_offset accordingly. More...
int	ff_tread_tag (GetByteContext *gb, int le, unsigned *tag, unsigned *type, unsigned *count, int *next)
	Reads the first 3 fields of a TIFF tag, which are the tag id, the tag type and the count of values for that tag. More...

Variables
static const uint8_t	type_sizes [14]
	sizes of various TIFF field types (string size = 100) More...
static const uint16_t	ifd_tags []

Detailed Description

TIFF Common Routines

Author

Thilo Borgmann <thilo.borgmann at mail.de>

Definition in file tiff_common.h.

Enumeration Type Documentation

TiffTypes

enum TiffTypes

data type identifiers for TIFF tags

Enumerator
TIFF_BYTE
TIFF_STRING
TIFF_SHORT
TIFF_LONG
TIFF_RATIONAL
TIFF_SBYTE
TIFF_UNDEFINED
TIFF_SSHORT
TIFF_SLONG
TIFF_SRATIONAL
TIFF_FLOAT
TIFF_DOUBLE
TIFF_IFD

Definition at line 36 of file tiff_common.h.

Function Documentation

ff_tis_ifd()

int ff_tis_ifd

(

unsigned

tag

)

Returns a value > 0 if the tag is a known IFD-tag.

The return value is the array index + 1 within ifd_tags[].

Definition at line 32 of file tiff_common.c.

Referenced by exif_decode_tag(), and ff_tread_tag().

ff_tget_short()

unsigned ff_tget_short	(	GetByteContext *	gb,
		int	le
	)

Reads a short from the bytestream using given endianness.

Definition at line 44 of file tiff_common.c.

Referenced by decode_frame(), ff_exif_decode_ifd(), ff_tadd_shorts_metadata(), ff_tdecode_header(), ff_tget(), ff_tread_tag(), and tiff_decode_tag().

ff_tget_long()

unsigned ff_tget_long	(	GetByteContext *	gb,
		int	le
	)

Reads a long from the bytestream using given endianness.

Definition at line 50 of file tiff_common.c.

Referenced by decode_frame(), dng_decode_tiles(), ff_exif_decode_ifd(), ff_tadd_long_metadata(), ff_tadd_rational_metadata(), ff_tdecode_header(), ff_tget(), ff_tread_tag(), and tiff_decode_tag().

ff_tget_double()

double ff_tget_double	(	GetByteContext *	gb,
		int	le
	)

Reads a double from the bytestream using given endianness.

Definition at line 56 of file tiff_common.c.

Referenced by ff_tadd_doubles_metadata(), and tiff_decode_tag().

ff_tget()

unsigned ff_tget	(	GetByteContext *	gb,
		int	type,
		int	le
	)

Reads a byte from the bytestream using given endianness.

Definition at line 63 of file tiff_common.c.

Referenced by decode_frame(), and tiff_decode_tag().

ff_tadd_rational_metadata()

int ff_tadd_rational_metadata	(	int	count,
		const char *	name,
		const char *	sep,
		GetByteContext *	gb,
		int	le,
		AVDictionary **	metadata
	)

Adds count rationals converted to a string into the metadata dictionary.

Definition at line 99 of file tiff_common.c.

Referenced by exif_add_metadata().

ff_tadd_long_metadata()

int ff_tadd_long_metadata	(	int	count,
		const char *	name,
		const char *	sep,
		GetByteContext *	gb,
		int	le,
		AVDictionary **	metadata
	)

Adds count longs converted to a string into the metadata dictionary.

Definition at line 123 of file tiff_common.c.

Referenced by exif_add_metadata().

ff_tadd_doubles_metadata()

int ff_tadd_doubles_metadata	(	int	count,
		const char *	name,
		const char *	sep,
		GetByteContext *	gb,
		int	le,
		AVDictionary **	metadata
	)

Adds count doubles converted to a string into the metadata dictionary.

Definition at line 144 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_metadata().

ff_tadd_shorts_metadata()

int ff_tadd_shorts_metadata	(	int	count,
		const char *	name,
		const char *	sep,
		GetByteContext *	gb,
		int	le,
		int	is_signed,
		AVDictionary **	metadata
	)

Adds count shorts converted to a string into the metadata dictionary.

Definition at line 165 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_metadata().

ff_tadd_bytes_metadata()

int ff_tadd_bytes_metadata	(	int	count,
		const char *	name,
		const char *	sep,
		GetByteContext *	gb,
		int	le,
		int	is_signed,
		AVDictionary **	metadata
	)

Adds count bytes converted to a string into the metadata dictionary.

Definition at line 187 of file tiff_common.c.

Referenced by exif_add_metadata().

ff_tadd_string_metadata()

int ff_tadd_string_metadata	(	int	count,
		const char *	name,
		GetByteContext *	gb,
		int	le,
		AVDictionary **	metadata
	)

Adds a string of count characters into the metadata dictionary.

Definition at line 208 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_metadata().

ff_tdecode_header()

int ff_tdecode_header	(	GetByteContext *	gb,
		int *	le,
		int *	ifd_offset
	)

Decodes a TIFF header from the input bytestream and sets the endianness in *le and the offset to the first IFD in *ifd_offset accordingly.

Definition at line 228 of file tiff_common.c.

Referenced by decode_frame(), mjpeg_decode_app(), and webp_decode_frame().

ff_tread_tag()

int ff_tread_tag	(	GetByteContext *	gb,
		int	le,
		unsigned *	tag,
		unsigned *	type,
		unsigned *	count,
		int *	next
	)

Reads the first 3 fields of a TIFF tag, which are the tag id, the tag type and the count of values for that tag.

Afterwards the bytestream is located at the first value to read and *next holds the bytestream offset of the following tag.

Definition at line 253 of file tiff_common.c.

Referenced by exif_decode_tag(), and tiff_decode_tag().

Variable Documentation

type_sizes

const uint8_t type_sizes[14]

static

Initial value:

= {
    0, 1, 100, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 4
}

sizes of various TIFF field types (string size = 100)

Definition at line 53 of file tiff_common.h.

Referenced by add_entry(), ff_tread_tag(), and tiff_decode_tag().

ifd_tags

const uint16_t ifd_tags[]

static

Initial value:

= {
    0x8769, 
    0x8825, 
    0xA005  
}

Definition at line 57 of file tiff_common.h.

Referenced by ff_tis_ifd().