FFmpeg
libavcodec
elsdec.h
Go to the documentation of this file.
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/*
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* ELS (Entropy Logarithmic-Scale) decoder
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*
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* Copyright (c) 2013 Maxim Poliakovski
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Entropy Logarithmic-Scale binary arithmetic coder
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*/
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#ifndef AVCODEC_ELSDEC_H
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#define AVCODEC_ELSDEC_H
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#include <stdint.h>
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#include <sys/types.h>
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#define ELS_EXPGOLOMB_LEN 10
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typedef
struct
ElsDecCtx
{
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const
uint8_t *
in_buf
;
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unsigned
x
;
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size_t
data_size
;
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int
j
,
t
,
diff
,
err
;
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}
ElsDecCtx
;
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typedef
struct
ElsRungNode
{
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uint8_t
rung
;
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uint16_t
next_index
;
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}
ElsRungNode
;
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typedef
struct
ElsUnsignedRung
{
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uint8_t
prefix_rung
[
ELS_EXPGOLOMB_LEN
+ 1];
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ElsRungNode
*
rem_rung_list
;
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size_t
rung_list_size
;
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uint16_t
avail_index
;
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}
ElsUnsignedRung
;
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void
ff_els_decoder_init
(
ElsDecCtx
*
ctx
,
const
uint8_t *in,
size_t
data_size);
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void
ff_els_decoder_uninit
(
ElsUnsignedRung
*rung);
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int
ff_els_decode_bit
(
ElsDecCtx
*
ctx
,
unsigned
char
*rung);
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unsigned
ff_els_decode_unsigned
(
ElsDecCtx
*
ctx
,
ElsUnsignedRung
*ur);
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#endif
/* AVCODEC_ELSDEC_H */
ElsRungNode::rung
uint8_t rung
Definition:
elsdec.h:44
ElsDecCtx::err
int err
Definition:
elsdec.h:40
ff_els_decode_unsigned
unsigned ff_els_decode_unsigned(ElsDecCtx *ctx, ElsUnsignedRung *ur)
Definition:
elsdec.c:352
ElsDecCtx::in_buf
const uint8_t * in_buf
Definition:
elsdec.h:37
ElsRungNode::next_index
uint16_t next_index
Definition:
elsdec.h:45
ElsDecCtx::diff
int diff
Definition:
elsdec.h:40
ElsDecCtx::x
unsigned x
Definition:
elsdec.h:38
ff_els_decoder_init
void ff_els_decoder_init(ElsDecCtx *ctx, const uint8_t *in, size_t data_size)
Definition:
elsdec.c:249
ElsUnsignedRung::avail_index
uint16_t avail_index
Definition:
elsdec.h:52
ElsDecCtx::t
int t
Definition:
elsdec.h:40
ElsDecCtx::j
int j
Definition:
elsdec.h:40
ctx
AVFormatContext * ctx
Definition:
movenc.c:49
ff_els_decoder_uninit
void ff_els_decoder_uninit(ElsUnsignedRung *rung)
Definition:
elsdec.c:274
ElsRungNode
Definition:
elsdec.h:43
ElsUnsignedRung
Definition:
elsdec.h:48
ELS_EXPGOLOMB_LEN
#define ELS_EXPGOLOMB_LEN
Definition:
elsdec.h:34
ElsDecCtx
Definition:
elsdec.h:36
ElsUnsignedRung::rem_rung_list
ElsRungNode * rem_rung_list
Definition:
elsdec.h:50
ElsUnsignedRung::rung_list_size
size_t rung_list_size
Definition:
elsdec.h:51
ff_els_decode_bit
int ff_els_decode_bit(ElsDecCtx *ctx, unsigned char *rung)
ElsUnsignedRung::prefix_rung
uint8_t prefix_rung[ELS_EXPGOLOMB_LEN+1]
Definition:
elsdec.h:49
ElsDecCtx::data_size
size_t data_size
Definition:
elsdec.h:39
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