Libav
rl.h
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1 /*
2  * Copyright (c) 2000-2002 Fabrice Bellard
3  * Copyright (c) 2002-2004 Michael Niedermayer
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
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 
39 typedef struct RLTable {
40  int n;
41  int last;
42  const uint16_t (*table_vlc)[2];
43  const int8_t *table_run;
44  const int8_t *table_level;
46  int8_t *max_level[2];
47  int8_t *max_run[2];
48  VLC vlc;
50 } RLTable;
51 
56 int ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
57 void ff_rl_init_vlc(RLTable *rl);
58 
62 void ff_rl_free(RLTable *rl);
63 
64 #define INIT_VLC_RL(rl, static_size)\
65 {\
66  int q;\
67  static RL_VLC_ELEM rl_vlc_table[32][static_size];\
68  INIT_VLC_STATIC(&rl.vlc, 9, rl.n + 1,\
69  &rl.table_vlc[0][1], 4, 2,\
70  &rl.table_vlc[0][0], 4, 2, static_size);\
71 \
72  if(!rl.rl_vlc[0]){\
73  for(q=0; q<32; q++)\
74  rl.rl_vlc[q]= rl_vlc_table[q];\
75 \
76  ff_rl_init_vlc(&rl);\
77  }\
78 }
79 
80 static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
81 {
82  int index;
83  index = rl->index_run[last][run];
84  if (index >= rl->n)
85  return rl->n;
86  if (level > rl->max_level[last][run])
87  return rl->n;
88  return index + level - 1;
89 }
90 
91 #endif /* AVCODEC_RL_H */
int last
number of values for last = 0
Definition: rl.h:41
const int8_t * table_level
Definition: rl.h:44
uint8_t run
Definition: svq3.c:203
RLTable.
Definition: rl.h:39
int8_t * max_run[2]
encoding & decoding
Definition: rl.h:47
uint8_t
int ff_rl_init(RLTable *rl, uint8_t static_store[2][2 *MAX_RUN+MAX_LEVEL+3])
Definition: rl.c:38
int8_t * max_level[2]
encoding & decoding
Definition: rl.h:46
#define MAX_LEVEL
Definition: rl.h:36
VLC vlc
decoding only deprecated FIXME remove
Definition: rl.h:48
Definition: vlc.h:26
int n
number of entries of table_vlc minus 1
Definition: rl.h:40
const uint16_t(* table_vlc)[2]
Definition: rl.h:42
const int8_t * table_run
Definition: rl.h:43
RL_VLC_ELEM * rl_vlc[32]
decoding only
Definition: rl.h:49
void ff_rl_init_vlc(RLTable *rl)
Definition: rl.c:104
void ff_rl_free(RLTable *rl)
Free the contents of a dynamically allocated table.
Definition: rl.c:27
int index
Definition: gxfenc.c:72
uint8_t * index_run[2]
encoding only
Definition: rl.h:45
uint8_t level
Definition: svq3.c:204
#define MAX_RUN
Definition: rl.h:35
static int get_rl_index(const RLTable *rl, int last, int run, int level)
Definition: rl.h:80