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Functions
tiff_common.c File Reference

TIFF Common Routines. More...

#include "tiff_common.h"

Go to the source code of this file.

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 endianess.
 
unsigned ff_tget_long (GetByteContext *gb, int le)
 Reads a long from the bytestream using given endianess.
 
double ff_tget_double (GetByteContext *gb, int le)
 Reads a double from the bytestream using given endianess.
 
unsigned ff_tget (GetByteContext *gb, int type, int le)
 Reads a byte from the bytestream using given endianess.
 
static char * auto_sep (int count, char *sep, int i, int columns)
 
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, 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, 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 endianess 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.
 

Detailed Description

TIFF Common Routines.

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

Definition in file tiff_common.c.

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 endianess.

Definition at line 43 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().

unsigned ff_tget_long ( GetByteContext gb,
int  le 
)

Reads a long from the bytestream using given endianess.

Definition at line 50 of file tiff_common.c.

Referenced by ff_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 endianess.

Definition at line 57 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 endianess.

Definition at line 64 of file tiff_common.c.

Referenced by decode_frame(), and tiff_decode_tag().

static char* auto_sep ( int  count,
char *  sep,
int  i,
int  columns 
)
static
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 88 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 122 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 153 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,
AVDictionary **  metadata 
)

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

Definition at line 184 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,
AVDictionary **  metadata 
)

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

Definition at line 215 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 245 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 endianess in *le and the offset to the first IFD in *ifd_offset accordingly.

Definition at line 265 of file tiff_common.c.

Referenced by decode_frame(), and mjpeg_decode_app().

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 290 of file tiff_common.c.

Referenced by exif_decode_tag(), and tiff_decode_tag().