367cc986afa25550b707cded4f7505ff17935409
[libav.git] / libavcodec / rl.h
1 /*
2 * Copyright (c) 2000-2002 Fabrice Bellard
3 * Copyright (c) 2002-2004 Michael Niedermayer
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 */