/* * 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*/