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rl.h
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1 /*
2  * Copyright (c) 2000-2002 Fabrice Bellard
3  * Copyright (c) 2002-2004 Michael Niedermayer
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * rl header.
25  */
26 
27 #ifndef AVCODEC_RL_H
28 #define AVCODEC_RL_H
29 
30 #include <stdint.h>
31 #include "get_bits.h"
32 
33 /* run length table */
34 #define MAX_RUN 64
35 #define MAX_LEVEL 64
36 
37 /** RLTable. */
38 typedef struct RLTable {
39  int n; ///< number of entries of table_vlc minus 1
40  int last; ///< number of values for last = 0
41  const uint16_t (*table_vlc)[2];
42  const int8_t *table_run;
43  const int8_t *table_level;
44  uint8_t *index_run[2]; ///< encoding only
45  int8_t *max_level[2]; ///< encoding & decoding
46  int8_t *max_run[2]; ///< encoding & decoding
47  RL_VLC_ELEM *rl_vlc[32]; ///< decoding only
48 } RLTable;
49 
50 /**
51  *
52  * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
53  * the level and run tables, if this is NULL av_malloc() will be used
54  */
55 void ff_init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
56 void ff_init_vlc_rl(RLTable *rl, unsigned static_size);
57 
58 #define INIT_VLC_RL(rl, static_size)\
59 {\
60  int q;\
61  static RL_VLC_ELEM rl_vlc_table[32][static_size];\
62 \
63  if(!rl.rl_vlc[0]){\
64  for(q=0; q<32; q++)\
65  rl.rl_vlc[q]= rl_vlc_table[q];\
66 \
67  ff_init_vlc_rl(&rl, static_size);\
68  }\
69 }
70 
71 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
72 {
73  int index;
74  index = rl->index_run[last][run];
75  if (index >= rl->n)
76  return rl->n;
77  if (level > rl->max_level[last][run])
78  return rl->n;
79  return index + level - 1;
80 }
81 
82 #endif /* AVCODEC_RL_H */