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71 lines
2.0 KiB
C
71 lines
2.0 KiB
C
/*
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* Copyright (c) 2016 Umair Khan <omerjerk@gmail.com>
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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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#ifndef AVCODEC_MLZ_H
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#define AVCODEC_MLZ_H
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#include "get_bits.h"
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#define CODE_UNSET -1
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#define CODE_BIT_INIT 9
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#define DIC_INDEX_INIT 512 // 2^9
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#define DIC_INDEX_MAX 32768 // 2^15
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#define FLUSH_CODE 256
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#define FREEZE_CODE 257
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#define FIRST_CODE 258
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#define MAX_CODE 32767
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#define TABLE_SIZE 35023 // TABLE_SIZE must be a prime number
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/** Dictionary structure for mlz decompression
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*/
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typedef struct MLZDict {
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int string_code;
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int parent_code;
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int char_code;
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int match_len;
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} MLZDict;
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/** MLZ data strucure
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*/
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typedef struct MLZ {
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int dic_code_bit;
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int current_dic_index_max;
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unsigned int bump_code;
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unsigned int flush_code;
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int next_code;
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int freeze_flag;
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MLZDict* dict;
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void* context;
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} MLZ;
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/** Initialize the dictionary
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*/
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int ff_mlz_init_dict(void *context, MLZ *mlz);
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/** Flush the dictionary
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*/
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void ff_mlz_flush_dict(MLZ *dict);
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/** Run mlz decompression on the next size bits and the output will be stored in buff
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*/
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int ff_mlz_decompression(MLZ* mlz, GetBitContext* gb, int size, unsigned char *buff);
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#endif /*AVCODEC_MLZ_H*/
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