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    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 */
56void init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
57void 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        init_vlc_rl(&rl);\
72    }\
73}
74
75static 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 */
87