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Diffstat (limited to 'libavcodec/mlz.h')
-rw-r--r-- | libavcodec/mlz.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/libavcodec/mlz.h b/libavcodec/mlz.h new file mode 100644 index 0000000..c3df52c --- /dev/null +++ b/libavcodec/mlz.h @@ -0,0 +1,70 @@ +/* + * 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*/ |