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
33
34 /* run length table */
37
38 /** RLTable. */
40 int n;
///< number of entries of table_vlc minus 1
41 int last;
///< number of values for last = 0
47 int8_t *
max_run[2];
///< encoding & decoding
50
51 /**
52 * Initialize max_level and index_run from table_run and table_level;
53 * this is equivalent to initializing RLTable.max_level[0] and
54 * RLTable.index_run[0] with ff_rl_init().
55 */
58 const uint8_t table_run[/* n */],
59 const uint8_t table_level[/* n*/], int n);
60
61 /**
62 * Initialize index_run, max_level and max_run from n, last, table_vlc,
63 * table_run and table_level.
64 * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3]
65 * to hold the level and run tables.
66 * @note This function does not touch rl_vlc at all, hence there is no need
67 * to synchronize calls to ff_rl_init() and ff_rl_init_vlc() using the
68 * same RLTable.
69 */
71
72 /**
73 * Initialize rl_vlc from n, last, table_vlc, table_run and table_level.
74 * All rl_vlc pointers to be initialized must already point to a static
75 * buffer of `static_size` RL_VLC_ELEM elements; if a pointer is NULL,
76 * initializing further VLCs stops.
77 * @note This function does not touch what ff_rl_init() initializes at all,
78 * hence there is no need to synchronize calls to ff_rl_init() and
79 * ff_rl_init_vlc() using the same RLTable.
80 */
82
83 #define VLC_INIT_RL(rl, static_size)\
84 {\
85 static RL_VLC_ELEM rl_vlc_table[32][static_size];\
86 \
87 for (int q = 0; q < 32; q++) \
88 rl.rl_vlc[q] = rl_vlc_table[q]; \
89 \
90 ff_rl_init_vlc(&rl, static_size); \
91 }
92
93 #define INIT_FIRST_VLC_RL(rl, static_size) \
94 do { \
95 static RL_VLC_ELEM rl_vlc_table[static_size]; \
96 \
97 rl.rl_vlc[0] = rl_vlc_table; \
98 ff_rl_init_vlc(&rl, static_size); \
99 } while (0)
100
102 {
110 }
111
112 #endif /* AVCODEC_RL_H */