/* * 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 header. */ #ifndef AVCODEC_RL_H #define AVCODEC_RL_H #include <stdint.h> #include "vlc.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 RL_VLC_ELEM *rl_vlc[32]; ///< decoding only } RLTable; /** * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] * to hold the level and run tables. */ void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]); void ff_rl_init_vlc(RLTable *rl, unsigned static_size); #define INIT_VLC_RL(rl, static_size)\ {\ int q;\ static RL_VLC_ELEM rl_vlc_table[32][static_size];\ \ if(!rl.rl_vlc[0]){\ for(q=0; q<32; q++)\ rl.rl_vlc[q]= rl_vlc_table[q];\ \ ff_rl_init_vlc(&rl, static_size);\ }\ } #define INIT_FIRST_VLC_RL(rl, static_size) \ do { \ static RL_VLC_ELEM rl_vlc_table[static_size]; \ \ rl.rl_vlc[0] = rl_vlc_table; \ ff_rl_init_vlc(&rl, static_size); \ } while (0) 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 */