Range coder. More...

#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "rangecoder.h"

Functions
av_cold void	ff_init_range_encoder (RangeCoder c, uint8_t buf, int buf_size)

av_cold void	ff_init_range_decoder (RangeCoder c, const uint8_t buf, int buf_size)

void	ff_build_rac_states (RangeCoder *c, int factor, int max_p)

int	ff_rac_terminate (RangeCoder *c, int version)
	Terminates the range coder. More...

int	ff_rac_check_termination (RangeCoder *c, int version)
	Check if at the current position there is a valid looking termination. More...

Detailed Description

Range coder.

based upon "Range encoding: an algorithm for removing redundancy from a digitised message. G. N. N. Martin Presented in March 1979 to the Video & Data Recording Conference, IBM UK Scientific Center held in Southampton July 24-27 1979."

Function Documentation

§ ff_rac_check_termination()

int ff_rac_check_termination	(	RangeCoder *	c,
		int	version
	)

Check if at the current position there is a valid looking termination.

Parameters

version version 0 requires the decoder to know the data size in bytes version 1 needs about 1 bit more space but does not need to carry the size from encoder to decoder

Returns: negative AVERROR code on error or non negative.

§ ff_rac_terminate()

int ff_rac_terminate	(	RangeCoder *	c,
		int	version
	)

Terminates the range coder.