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
32 #include "vlc.h"
33
34 /* run length table */
35 #define MAX_RUN 64
36 #define MAX_LEVEL 64
37
38 /** RLTable. */
39 typedef struct RLTable {
40 int n; ///< number of entries of table_vlc minus 1
41 int last; ///< number of values for last = 0
42 const uint16_t (*table_vlc)[2];
43 const int8_t *table_run;
44 const int8_t *table_level;
45 uint8_t *index_run[2]; ///< encoding only
46 int8_t *max_level[2]; ///< encoding & decoding
47 int8_t *max_run[2]; ///< encoding & decoding
48 RL_VLC_ELEM *rl_vlc[32]; ///< decoding only
49 } RLTable;
50
51 /**
52 * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3]
53 * to hold the level and run tables.
54 */
55 void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
56 void ff_rl_init_vlc(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_rl_init_vlc(&rl, static_size);\
68 }\
69 }
70
71 #define INIT_FIRST_VLC_RL(rl, static_size) \
72 do { \
73 static RL_VLC_ELEM rl_vlc_table[static_size]; \
74 \
75 rl.rl_vlc[0] = rl_vlc_table; \
76 ff_rl_init_vlc(&rl, static_size); \
77 } while (0)
78
get_rl_index(const RLTable * rl,int last,int run,int level)79 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
80 {
81 int index;
82 index = rl->index_run[last][run];
83 if (index >= rl->n)
84 return rl->n;
85 if (level > rl->max_level[last][run])
86 return rl->n;
87 return index + level - 1;
88 }
89
90 #endif /* AVCODEC_RL_H */
91