TIFF Common Routines. More...

#include "tiff_common.h"

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.

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. More...

Detailed Description

TIFF Common Routines.

Author: Thilo Borgmann <thilo.borgmann at mail.de>

Function Documentation

§ ff_tget()

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

Reads a byte from the bytestream using given endianness.

§ ff_tget_double()

double ff_tget_double	(	GetByteContext *	gb,
		int	le
	)

Reads a double from the bytestream using given endianness.

§ ff_tget_long()

unsigned ff_tget_long	(	GetByteContext *	gb,
		int	le
	)

Reads a long from the bytestream using given endianness.

§ ff_tget_short()

unsigned ff_tget_short	(	GetByteContext *	gb,
		int	le
	)

Reads a short from the bytestream using given endianness.

§ 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[].

§ 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.

Functions