Range coder. More...

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

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."

Definition in file rangecoder.c.

Function Documentation

◆ ff_init_range_encoder()

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

Definition at line 42 of file rangecoder.c.

Referenced by encode_frame(), encode_frame(), ff_ffv1_write_extradata(), ff_init_range_decoder(), and main().

◆ ff_init_range_decoder()

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

Definition at line 53 of file rangecoder.c.

Referenced by decode_frame(), decode_header(), decode_slices(), ff_ffv1_read_extra_header(), main(), mxf_parse_ffv1_frame(), and parse().

◆ ff_build_rac_states()

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

Definition at line 68 of file rangecoder.c.

Referenced by decode_frame(), decode_header(), decode_slices(), encode_frame(), encode_frame(), encode_init_internal(), ff_ffv1_encode_init(), ff_ffv1_parse_header(), ff_ffv1_read_extra_header(), ff_ffv1_write_extradata(), main(), mxf_parse_ffv1_frame(), and parse().

◆ ff_rac_terminate()

int ff_rac_terminate	(	RangeCoder *	c,
		int	version )

Terminates the range coder.

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

Definition at line 109 of file rangecoder.c.