FFmpeg
dv_tablegen.h
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1 /*
2  * Header file for hardcoded DV tables
3  *
4  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #ifndef AVCODEC_DV_TABLEGEN_H
24 #define AVCODEC_DV_TABLEGEN_H
25 
26 #include <stdint.h>
27 #include "libavutil/attributes.h"
28 
29 #include "dvdata.h"
30 
31 #if CONFIG_SMALL
32 #define DV_VLC_MAP_RUN_SIZE 15
33 #define DV_VLC_MAP_LEV_SIZE 23
34 #else
35 #define DV_VLC_MAP_RUN_SIZE 64
36 #define DV_VLC_MAP_LEV_SIZE 512 // FIXME sign was removed so this should be /2 but needs check
37 #endif
38 
39 /* VLC encoding lookup table */
40 typedef struct dv_vlc_pair {
41  uint32_t vlc;
42  uint32_t size;
43 } dv_vlc_pair;
44 
45 #if CONFIG_HARDCODED_TABLES
46 #define dv_vlc_map_tableinit()
47 #include "libavcodec/dv_tables.h"
48 #else
50 
51 static av_cold void dv_vlc_map_tableinit(void)
52 {
53  uint32_t code = 0;
54  int i, j;
55  for (int i = 0; i < NB_DV_VLC; i++) {
56  uint32_t cur_code = code >> (32 - ff_dv_vlc_len[i]);
57  code += 1U << (32 - ff_dv_vlc_len[i]);
59  continue;
60 #if CONFIG_SMALL
62  continue;
63 #endif
64 
66  continue;
67 
69  cur_code << (!!ff_dv_vlc_level[i]);
72  }
73  for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
74 #if CONFIG_SMALL
75  for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
76  if (dv_vlc_map[i][j].size == 0) {
77  dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
78  (dv_vlc_map[i - 1][0].vlc <<
79  dv_vlc_map[0][j].size);
80  dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
81  dv_vlc_map[0][j].size;
82  }
83  }
84 #else
85  for (j = 1; j < DV_VLC_MAP_LEV_SIZE / 2; j++) {
86  if (dv_vlc_map[i][j].size == 0) {
87  dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
88  (dv_vlc_map[i - 1][0].vlc <<
89  dv_vlc_map[0][j].size);
90  dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
91  dv_vlc_map[0][j].size;
92  }
93  dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].vlc = dv_vlc_map[i][j].vlc | 1;
94  dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].size = dv_vlc_map[i][j].size;
95  }
96 #endif
97  }
98 }
99 #endif /* CONFIG_HARDCODED_TABLES */
100 
101 #endif /* AVCODEC_DV_TABLEGEN_H */
dv_vlc_map_tableinit
static av_cold void dv_vlc_map_tableinit(void)
Definition: dv_tablegen.h:51
NB_DV_VLC
#define NB_DV_VLC
Definition: dvdata.h:29
dv_vlc_pair::vlc
uint32_t vlc
Definition: dv_tablegen.h:41
DV_VLC_MAP_RUN_SIZE
#define DV_VLC_MAP_RUN_SIZE
Definition: dv_tablegen.h:35
av_cold
#define av_cold
Definition: attributes.h:90
dv_vlc_pair
Definition: dv_tablegen.h:40
size
int size
Definition: twinvq_data.h:10344
attributes.h
ff_dv_vlc_level
const uint8_t ff_dv_vlc_level[NB_DV_VLC]
Definition: dvdata.c:185
ff_dv_vlc_run
const uint8_t ff_dv_vlc_run[NB_DV_VLC]
Definition: dvdata.c:131
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
dv_vlc_map
static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE]
Definition: dv_tablegen.h:49
ff_dv_vlc_len
const uint8_t ff_dv_vlc_len[NB_DV_VLC]
Definition: dvdata.c:77
U
#define U(x)
Definition: vpx_arith.h:37
dv_vlc_pair::size
uint32_t size
Definition: dv_tablegen.h:42
DV_VLC_MAP_LEV_SIZE
#define DV_VLC_MAP_LEV_SIZE
Definition: dv_tablegen.h:36
dvdata.h