mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.7 KiB
61 lines
1.7 KiB
10 years ago
|
/*
|
||
|
|
* ELS (Entropy Logarithmic-Scale) decoder
|
||
|
|
*
|
||
|
|
* Copyright (c) 2013 Maxim Poliakovski
|
||
|
|
*
|
||
|
|
* This file is part of Libav.
|
||
|
|
*
|
||
|
|
* Libav is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* Libav is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with Libav; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file
|
||
|
|
* Entropy Logarithmic-Scale binary arithmetic coder
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef AVCODEC_ELSDEC_H
|
||
|
|
#define AVCODEC_ELSDEC_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <sys/types.h>
|
||
|
|
|
||
|
|
#define ELS_EXPGOLOMB_LEN 10
|
||
|
|
|
||
|
|
typedef struct ElsDecCtx {
|
||
|
|
const uint8_t *in_buf;
|
||
|
|
unsigned x;
|
||
|
|
size_t data_size;
|
||
|
|
int j, t, diff, err;
|
||
|
|
} ElsDecCtx;
|
||
|
|
|
||
|
|
typedef struct ElsRungNode {
|
||
|
|
uint8_t rung;
|
||
|
|
uint16_t next_index;
|
||
|
|
} ElsRungNode;
|
||
|
|
|
||
|
|
typedef struct ElsUnsignedRung {
|
||
|
|
uint8_t prefix_rung[ELS_EXPGOLOMB_LEN + 1];
|
||
|
|
ElsRungNode *rem_rung_list;
|
||
|
|
size_t rung_list_size;
|
||
|
|
uint16_t avail_index;
|
||
|
|
} ElsUnsignedRung;
|
||
|
|
|
||
|
|
void ff_els_decoder_init(ElsDecCtx *ctx, const uint8_t *in, size_t data_size);
|
||
|
|
void ff_els_decoder_uninit(ElsUnsignedRung *rung);
|
||
|
|
int ff_els_decode_bit(ElsDecCtx *ctx, unsigned char *rung);
|
||
|
|
unsigned ff_els_decode_unsigned(ElsDecCtx *ctx, ElsUnsignedRung *ur);
|
||
|
|
|
||
|
|
#endif /* AVCODEC_ELSDEC_H */
|