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70 lines
2.0 KiB
70 lines
2.0 KiB
/* |
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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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