lzwenc.c File Reference

LZW encoder. More...

#include "avcodec.h"
#include "lzw.h"
#include "mathops.h"
#include "put_bits.h"

Classes
struct	Code
	One code in hash table. More...
struct	LZWEncodeState
	LZW encode state. More...

Macros
#define	LZW_MAXBITS   12
#define	LZW_SIZTABLE   (1<<LZW_MAXBITS)
#define	LZW_HASH_SIZE   16411
#define	LZW_HASH_SHIFT   6
#define	LZW_PREFIX_EMPTY   -1
#define	LZW_PREFIX_FREE   -2

Typedefs
typedef struct Code	Code
	One code in hash table.
typedef struct LZWEncodeState	LZWEncodeState
	LZW encode state.

Functions
void	ff_lzw_encode_init (LZWEncodeState *s, uint8_t *outbuf, int outsize, int maxbits, enum FF_LZW_MODES mode, void(*lzw_put_bits)(PutBitContext *, int, unsigned))
	Initialize LZW encoder. More...
int	ff_lzw_encode (LZWEncodeState *s, const uint8_t *inbuf, int insize)
	LZW main compress function. More...
int	ff_lzw_encode_flush (LZWEncodeState *s, void(*lzw_flush_put_bits)(PutBitContext *))
	Write end code and flush bitstream. More...

Variables
const int	ff_lzw_encode_state_size = sizeof(LZWEncodeState)

Detailed Description

LZW encoder.

Author

Bartlomiej Wolowiec

Function Documentation

ff_lzw_encode()

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

ff_lzw_encode_flush()

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

Write end code and flush bitstream.

Parameters

s

LZW state

Returns

Number of bytes written or -1 on error

ff_lzw_encode_init()

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

Initialize LZW encoder.

Please set s->clear_code, s->end_code and s->maxbits before run.

Parameters

s	LZW state
outbuf	Output buffer
outsize	Size of output buffer
maxbits	Maximum length of code