Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 */ |