rl.h
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上传日期:2022-07-11
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- /*
- * Copyright (c) 2000-2002 Fabrice Bellard
- * Copyright (c) 2002-2004 Michael Niedermayer
- *
- * 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
- */
- /**
- * @file rl.h
- * rl header.
- */
- #ifndef AVCODEC_RL_H
- #define AVCODEC_RL_H
- //#include <stdint.h>
- #include "bitstream.h"
- /* run length table */
- #define MAX_RUN 64
- #define MAX_LEVEL 64
- /** RLTable. */
- typedef struct RLTable {
- int n; ///< number of entries of table_vlc minus 1
- int last; ///< number of values for last = 0
- const uint16_t (*table_vlc)[2];
- const int8_t *table_run;
- const int8_t *table_level;
- uint8_t *index_run[2]; ///< encoding only
- int8_t *max_level[2]; ///< encoding & decoding
- int8_t *max_run[2]; ///< encoding & decoding
- VLC vlc; ///< decoding only deprecated FIXME remove
- RL_VLC_ELEM *rl_vlc[32]; ///< decoding only
- } RLTable;
- /**
- *
- * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
- * the level and run tables, if this is NULL av_malloc() will be used
- */
- void init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
- void init_vlc_rl(RLTable *rl);
- #define INIT_VLC_RL(rl, static_size)
- {
- int q;
- static RL_VLC_ELEM rl_vlc_table[32][static_size];
- INIT_VLC_STATIC(&rl.vlc, 9, rl.n + 1,
- &rl.table_vlc[0][1], 4, 2,
- &rl.table_vlc[0][0], 4, 2, static_size);
- if(!rl.rl_vlc[0]){
- for(q=0; q<32; q++)
- rl.rl_vlc[q]= rl_vlc_table[q];
- init_vlc_rl(&rl);
- }
- }
- static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
- {
- int index;
- index = rl->index_run[last][run];
- if (index >= rl->n)
- return rl->n;
- if (level > rl->max_level[last][run])
- return rl->n;
- return index + level - 1;
- }
- #endif /* AVCODEC_RL_H */