Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / rl.h
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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. */
38typedef 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 */
55void ff_init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
56void 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
71static 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 */