elsdec.c File Reference

Entropy Logarithmic-Scale binary arithmetic decoder. More...

#include <math.h>
#include <stdint.h>
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "elsdec.h"

Go to the source code of this file.

Data Structures
struct	Ladder

Macros
#define	ELS_JOTS_PER_BYTE   36
#define	ELS_MAX   (1 << 24)
#define	RUNG_SPACE   (64 * sizeof(ElsRungNode))

Functions
void	ff_els_decoder_init (ElsDecCtx *ctx, const uint8_t *in, size_t data_size)
void	ff_els_decoder_uninit (ElsUnsignedRung *rung)
static int	els_import_byte (ElsDecCtx *ctx)
int	ff_els_decode_bit (ElsDecCtx *ctx, uint8_t *rung)
unsigned	ff_els_decode_unsigned (ElsDecCtx *ctx, ElsUnsignedRung *ur)

Variables
static const struct Ladder	Ladder [174]
static const uint32_t	els_exp_tab [ELS_JOTS_PER_BYTE *4+1]

Detailed Description

Entropy Logarithmic-Scale binary arithmetic decoder.

Definition in file elsdec.c.

Macro Definition Documentation

#define ELS_JOTS_PER_BYTE   36

Definition at line 38 of file elsdec.c.

Referenced by els_import_byte(), ff_els_decode_bit(), and ff_els_decoder_init().

#define ELS_MAX   (1 << 24)

Definition at line 39 of file elsdec.c.

Referenced by ff_els_decoder_init().

#define RUNG_SPACE   (64 * sizeof(ElsRungNode))

Definition at line 40 of file elsdec.c.

Referenced by ff_els_decode_unsigned().

Function Documentation

void ff_els_decoder_init	(	ElsDecCtx *	ctx,
		const uint8_t *	in,
		size_t	data_size
	)

Definition at line 247 of file elsdec.c.

Referenced by epic_jb_decode_tile().

void ff_els_decoder_uninit

(

ElsUnsignedRung *

rung

)

Definition at line 272 of file elsdec.c.

Referenced by epic_jb_decode_tile().

static int els_import_byte ( ElsDecCtx *  ctx )

static

Definition at line 277 of file elsdec.c.

Referenced by ff_els_decode_bit().

int ff_els_decode_bit	(	ElsDecCtx *	ctx,
		uint8_t *	rung
	)

Definition at line 291 of file elsdec.c.

Referenced by epic_decode_from_cache(), epic_decode_run_length(), epic_predict_pixel(), epic_predict_pixel2(), and ff_els_decode_unsigned().

unsigned ff_els_decode_unsigned	(	ElsDecCtx *	ctx,
		ElsUnsignedRung *	ur
	)

Definition at line 350 of file elsdec.c.

Referenced by epic_decode_component_pred(), epic_decode_pixel_pred(), epic_handle_edges(), and epic_jb_decode_tile().

Variable Documentation

const struct Ladder Ladder[174]

static

const uint32_t els_exp_tab[ELS_JOTS_PER_BYTE *4+1]

static

Initial value:

= {
           0,        0,       0,       0,       0,       0,         0,        0,
           0,        0,       0,       0,       0,       0,         0,        0,
           0,        0,       0,       0,       0,       0,         0,        0,
           0,        0,       0,       0,       0,       0,         0,        0,
           0,        0,       0,       0,       1,       1,         1,        1,
           1,        2,       2,       2,       3,       4,         4,        5,
           6,        7,       8,      10,      11,      13,        16,       18,
          21,       25,      29,      34,      40,      47,        54,       64,
          74,       87,     101,     118,     138,      161,      188,      219,
         256,      298,     348,     406,     474,      552,      645,      752,
         877,     1024,    1194,    1393,    1625,     1896,     2211,     2580,
        3010,     3511,    4096,    4778,    5573,     6501,     7584,     8847,
       10321,    12040,   14045,   16384,   19112,    22295,    26007,    30339,
       35391,    41285,   48160,   56180,   65536,    76288,    89088,   103936,
      121344,   141312,  165120,  192512,  224512,   262144,   305664,   356608,
      416000,   485376,  566016,  660480,  770560,   898816,  1048576,  1223168,
     1426688,  1664256, 1941504, 2264832, 2642176,  3082240,  3595520,  4194304,
     4892672,  5707520, 6657792, 7766784, 9060096, 10568960, 12328960, 14382080,
    16777216,
}

Definition at line 225 of file elsdec.c.

Referenced by ff_els_decode_bit(), and ff_els_decoder_init().