tiff_common.h File Reference

TIFF Common Routines. More...

#include "avcodec.h"
#include "tiff.h"
#include "bytestream.h"
#include "libavutil/bprint.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.
unsigned	ff_tget_short (GetByteContext *gb, int le)
	Reads a short from the bytestream using given endianness.
unsigned	ff_tget_long (GetByteContext *gb, int le)
	Reads a long from the bytestream using given endianness.
double	ff_tget_double (GetByteContext *gb, int le)
	Reads a double from the bytestream using given endianness.
unsigned	ff_tget (GetByteContext *gb, int type, int le)
	Reads a byte from the bytestream using given endianness.
char *	ff_trationals2str (int *rp, int count, const char *sep)
	Returns an allocated string containing count rational values using the given separator.
char *	ff_tlongs2str (int32_t *lp, int count, const char *sep)
	Returns an allocated string containing count long values using the given separator.
char *	ff_tdoubles2str (double *dp, int count, const char *sep)
	Returns an allocated string containing count double values using the given separator.
char *	ff_tshorts2str (int16_t *sp, int count, const char *sep)
	Returns an allocated string containing count short values using the given separator.
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.
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.
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.
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.
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.
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.
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.
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.

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

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 37 of file tiff_common.h.

Function Documentation

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 31 of file tiff_common.c.

Referenced by exif_decode_tag(), and ff_tread_tag().

unsigned ff_tget_short	(	GetByteContext *	gb,
		int	le
	)

Reads a short from the bytestream using given endianness.

Definition at line 43 of file tiff_common.c.

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

unsigned ff_tget_long	(	GetByteContext *	gb,
		int	le
	)

Reads a long from the bytestream using given endianness.

Definition at line 49 of file tiff_common.c.

Referenced by avpriv_exif_decode_ifd(), ff_tadd_long_metadata(), ff_tadd_rational_metadata(), ff_tdecode_header(), ff_tget(), and ff_tread_tag().

double ff_tget_double	(	GetByteContext *	gb,
		int	le
	)

Reads a double from the bytestream using given endianness.

Definition at line 55 of file tiff_common.c.

Referenced by ff_tadd_doubles_metadata(), and tiff_decode_tag().

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

Reads a byte from the bytestream using given endianness.

Definition at line 62 of file tiff_common.c.

Referenced by decode_frame(), and tiff_decode_tag().

char* ff_trationals2str	(	int *	rp,
		int	count,
		const char *	sep
	)

Returns an allocated string containing count rational values using the given separator.

char* ff_tlongs2str	(	int32_t *	lp,
		int	count,
		const char *	sep
	)

Returns an allocated string containing count long values using the given separator.

char* ff_tdoubles2str	(	double *	dp,
		int	count,
		const char *	sep
	)

Returns an allocated string containing count double values using the given separator.

char* ff_tshorts2str	(	int16_t *	sp,
		int	count,
		const char *	sep
	)

Returns an allocated string containing count short values using the given separator.

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 82 of file tiff_common.c.

Referenced by exif_add_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 116 of file tiff_common.c.

Referenced by exif_add_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 147 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_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 178 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_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 210 of file tiff_common.c.

Referenced by exif_add_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 241 of file tiff_common.c.

Referenced by add_metadata(), and exif_add_metadata().

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 261 of file tiff_common.c.

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

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 286 of file tiff_common.c.

Referenced by exif_decode_tag(), and tiff_decode_tag().

Variable Documentation

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 54 of file tiff_common.h.

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

const uint16_t ifd_tags[]

static

Initial value:

= {
    0x8769, 
    0x8825, 
    0xA005  
}

Definition at line 58 of file tiff_common.h.

Referenced by ff_tis_ifd().