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/* |
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* Copyright (c) 2000-2002 Fabrice Bellard |
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* Copyright (c) 2002-2004 Michael Niedermayer |
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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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/** |
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* @file |
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* rl header. |
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*/ |
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#ifndef AVCODEC_RL_H |
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#define AVCODEC_RL_H |
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#include <stdint.h> |
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#include "vlc.h" |
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/* run length table */ |
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#define MAX_RUN 64 |
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#define MAX_LEVEL 64 |
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/** RLTable. */ |
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typedef struct RLTable { |
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int n; ///< number of entries of table_vlc minus 1 |
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int last; ///< number of values for last = 0 |
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const uint16_t (*table_vlc)[2]; |
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const int8_t *table_run; |
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const int8_t *table_level; |
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uint8_t *index_run[2]; ///< encoding only |
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int8_t *max_level[2]; ///< encoding & decoding |
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int8_t *max_run[2]; ///< encoding & decoding |
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RL_VLC_ELEM *rl_vlc[32]; ///< decoding only |
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} RLTable; |
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/** |
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* @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] |
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* to hold the level and run tables. |
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*/ |
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void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]); |
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void ff_rl_init_vlc(RLTable *rl, unsigned static_size); |
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#define INIT_VLC_RL(rl, static_size)\ |
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{\ |
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int q;\ |
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static RL_VLC_ELEM rl_vlc_table[32][static_size];\ |
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\ |
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if(!rl.rl_vlc[0]){\ |
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for(q=0; q<32; q++)\ |
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rl.rl_vlc[q]= rl_vlc_table[q];\ |
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\ |
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ff_rl_init_vlc(&rl, static_size);\ |
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}\ |
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} |
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#define INIT_FIRST_VLC_RL(rl, static_size) \ |
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do { \ |
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static RL_VLC_ELEM rl_vlc_table[static_size]; \ |
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\ |
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rl.rl_vlc[0] = rl_vlc_table; \ |
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ff_rl_init_vlc(&rl, static_size); \ |
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} while (0) |
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38298498 |
static inline int get_rl_index(const RLTable *rl, int last, int run, int level) |
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{ |
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int index; |
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index = rl->index_run[last][run]; |
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✓✓ |
38298498 |
if (index >= rl->n) |
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return rl->n; |
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✓✓ |
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if (level > rl->max_level[last][run]) |
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return rl->n; |
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return index + level - 1; |
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} |
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#endif /* AVCODEC_RL_H */ |