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.
70 lines
2.0 KiB
70 lines
2.0 KiB
/* |
|
* Copyright (c) 2016 Umair Khan <omerjerk@gmail.com> |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg 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. |
|
* |
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#ifndef AVCODEC_MLZ_H |
|
#define AVCODEC_MLZ_H |
|
|
|
#include "get_bits.h" |
|
|
|
#define CODE_UNSET -1 |
|
#define CODE_BIT_INIT 9 |
|
#define DIC_INDEX_INIT 512 // 2^9 |
|
#define DIC_INDEX_MAX 32768 // 2^15 |
|
#define FLUSH_CODE 256 |
|
#define FREEZE_CODE 257 |
|
#define FIRST_CODE 258 |
|
#define MAX_CODE 32767 |
|
#define TABLE_SIZE 35023 // TABLE_SIZE must be a prime number |
|
|
|
/** Dictionary structure for mlz decompression |
|
*/ |
|
typedef struct MLZDict { |
|
int string_code; |
|
int parent_code; |
|
int char_code; |
|
int match_len; |
|
} MLZDict; |
|
|
|
/** MLZ data strucure |
|
*/ |
|
typedef struct MLZ { |
|
int dic_code_bit; |
|
int current_dic_index_max; |
|
unsigned int bump_code; |
|
unsigned int flush_code; |
|
int next_code; |
|
int freeze_flag; |
|
MLZDict* dict; |
|
void* context; |
|
} MLZ; |
|
|
|
/** Initialize the dictionary |
|
*/ |
|
void ff_mlz_init_dict(void* context, MLZ *mlz); |
|
|
|
/** Flush the dictionary |
|
*/ |
|
void ff_mlz_flush_dict(MLZ *dict); |
|
|
|
/** Run mlz decompression on the next size bits and the output will be stored in buff |
|
*/ |
|
int ff_mlz_decompression(MLZ* mlz, GetBitContext* gb, int size, unsigned char *buff); |
|
|
|
#endif /*AVCODEC_MLZ_H*/
|
|
|