libavcodec/lzw.h File Reference

LZW decoding routines. More...

#include <stdint.h>

Go to the source code of this file.

Typedefs
typedef void	LZWState
Enumerations
enum	FF_LZW_MODES { FF_LZW_GIF, FF_LZW_TIFF }
Functions
void	ff_lzw_decode_open (LZWState **p)
void	ff_lzw_decode_close (LZWState **p)
int	ff_lzw_decode_init (LZWState *s, int csize, const uint8_t *buf, int buf_size, int mode)
	Initialize LZW decoder.
int	ff_lzw_decode (LZWState *s, uint8_t *buf, int len)
	Decode given number of bytes NOTE: the algorithm here is inspired from the LZW GIF decoder written by Steven A.
const uint8_t *	ff_lzw_cur_ptr (LZWState *lzw)
void	ff_lzw_decode_tail (LZWState *lzw)
void	ff_lzw_encode_init (struct LZWEncodeState *s, uint8_t *outbuf, int outsize, int maxbits, enum FF_LZW_MODES mode, void(*lzw_put_bits)(struct PutBitContext *, int, unsigned int))
int	ff_lzw_encode (struct LZWEncodeState *s, const uint8_t *inbuf, int insize)
	LZW main compress function.
int	ff_lzw_encode_flush (struct LZWEncodeState *s, void(*lzw_flush_put_bits)(struct PutBitContext *))
Variables
const int	ff_lzw_encode_state_size

---

Detailed Description

LZW decoding routines.

Author:

Fabrice Bellard

modified for use in TIFF by Konstantin Shishkov

Definition in file lzw.h.

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Typedef Documentation

typedef void LZWState

Definition at line 43 of file lzw.h.

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Enumeration Type Documentation

enum FF_LZW_MODES

Enumerator:

FF_LZW_GIF
FF_LZW_TIFF

Definition at line 37 of file lzw.h.

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Function Documentation

const uint8_t* ff_lzw_cur_ptr

(

LZWState *

lzw

)

Definition at line 95 of file lzw.c.

Referenced by gif_read_image().

int ff_lzw_decode	(	LZWState *	p,
		uint8_t *	buf,
		int	len
	)

Decode given number of bytes NOTE: the algorithm here is inspired from the LZW GIF decoder written by Steven A.

Bennett in 1987.

Parameters:

	p	LZW context
	buf	output buffer
	len	number of bytes to decode

Returns:

number of bytes decoded

Definition at line 175 of file lzw.c.

Referenced by gif_read_image(), and tiff_unpack_strip().

void ff_lzw_decode_close

(

LZWState **

p

)

Definition at line 123 of file lzw.c.

Referenced by gif_decode_close(), and tiff_end().

int ff_lzw_decode_init	(	LZWState *	p,
		int	csize,
		const uint8_t *	buf,
		int	buf_size,
		int	mode
	)

Initialize LZW decoder.

Parameters:

	p	LZW context
	csize	initial code size in bits
	buf	input data
	buf_size	input data size
	mode	decoder working mode - either GIF or TIFF

Definition at line 136 of file lzw.c.

Referenced by gif_read_image(), and tiff_unpack_strip().

void ff_lzw_decode_open

(

LZWState **

p

)

Definition at line 118 of file lzw.c.

Referenced by gif_decode_init(), and tiff_init().

void ff_lzw_decode_tail

(

LZWState *

lzw

)

Definition at line 100 of file lzw.c.

Referenced by gif_read_image().

int ff_lzw_encode	(	LZWEncodeState *	s,
		const uint8_t *	inbuf,
		int	insize
	)

LZW main compress function.

Parameters:

	s	LZW state
	inbuf	Input buffer
	insize	Size of input buffer

Returns:

Number of bytes written or -1 on error

Definition at line 226 of file lzwenc.c.

Referenced by encode_strip(), and gif_image_write_image().

int ff_lzw_encode_flush	(	struct LZWEncodeState *	s,
		void(*)(struct PutBitContext *)	lzw_flush_put_bits
	)

Referenced by encode_frame(), and gif_image_write_image().

void ff_lzw_encode_init	(	struct LZWEncodeState *	s,
		uint8_t *	outbuf,
		int	outsize,
		int	maxbits,
		enum FF_LZW_MODES	mode,
		void(*)(struct PutBitContext *, int, unsigned int)	lzw_put_bits
	)

Referenced by encode_frame(), and gif_image_write_image().

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Variable Documentation

const int ff_lzw_encode_state_size

Definition at line 66 of file lzwenc.c.

Referenced by encode_frame(), and gif_encode_init().