forked from KolibriOS/kolibrios
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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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 "get_bits.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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*
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* @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
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* the level and run tables, if this is NULL av_malloc() will be used
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*/
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int 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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/**
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* Free the contents of a dynamically allocated table.
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*/
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void ff_rl_free(RLTable *rl);
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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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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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if (index >= rl->n)
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return rl->n;
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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 */
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