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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  VLC vlc; ///< decoding only deprecated FIXME remove
48  RL_VLC_ELEM *rl_vlc[32]; ///< decoding only
49 } RLTable;
50 
51 /**
52  *
53  * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
54  * the level and run tables, if this is NULL av_malloc() will be used
55  */
56 void ff_init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
57 void ff_init_vlc_rl(RLTable *rl);
58 
59 #define INIT_VLC_RL(rl, static_size)\
60 {\
61  int q;\
62  static RL_VLC_ELEM rl_vlc_table[32][static_size];\
63  INIT_VLC_STATIC(&rl.vlc, 9, rl.n + 1,\
64  &rl.table_vlc[0][1], 4, 2,\
65  &rl.table_vlc[0][0], 4, 2, static_size);\
66 \
67  if(!rl.rl_vlc[0]){\
68  for(q=0; q<32; q++)\
69  rl.rl_vlc[q]= rl_vlc_table[q];\
70 \
71  ff_init_vlc_rl(&rl);\
72  }\
73 }
74 
75 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
76 {
77  int index;
78  index = rl->index_run[last][run];
79  if (index >= rl->n)
80  return rl->n;
81  if (level > rl->max_level[last][run])
82  return rl->n;
83  return index + level - 1;
84 }
85 
86 #endif /* AVCODEC_RL_H */