PageRenderTime 38ms CodeModel.GetById 15ms app.highlight 17ms RepoModel.GetById 2ms app.codeStats 0ms

/libavcodec/dv_tablegen.h

http://github.com/FFmpeg/FFmpeg
C Header | 98 lines | 66 code | 10 blank | 22 comment | 12 complexity | 10db91f40da536c07f7c035af10d8e21 MD5 | raw file
 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 */
40typedef 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
49static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
50
51static av_cold void dv_vlc_map_tableinit(void)
52{
53    int i, j;
54    for (i = 0; i < NB_DV_VLC - 1; i++) {
55        if (ff_dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
56            continue;
57#if CONFIG_SMALL
58        if (ff_dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
59            continue;
60#endif
61
62        if (dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size != 0)
63            continue;
64
65        dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].vlc  =
66            ff_dv_vlc_bits[i] << (!!ff_dv_vlc_level[i]);
67        dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size =
68            ff_dv_vlc_len[i]   + (!!ff_dv_vlc_level[i]);
69    }
70    for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
71#if CONFIG_SMALL
72        for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
73            if (dv_vlc_map[i][j].size == 0) {
74                dv_vlc_map[i][j].vlc  = dv_vlc_map[0][j].vlc |
75                                        (dv_vlc_map[i - 1][0].vlc <<
76                                         dv_vlc_map[0][j].size);
77                dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
78                                        dv_vlc_map[0][j].size;
79            }
80        }
81#else
82        for (j = 1; j < DV_VLC_MAP_LEV_SIZE / 2; j++) {
83            if (dv_vlc_map[i][j].size == 0) {
84                dv_vlc_map[i][j].vlc  = dv_vlc_map[0][j].vlc |
85                                        (dv_vlc_map[i - 1][0].vlc <<
86                                         dv_vlc_map[0][j].size);
87                dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
88                                        dv_vlc_map[0][j].size;
89            }
90            dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].vlc  = dv_vlc_map[i][j].vlc | 1;
91            dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].size = dv_vlc_map[i][j].size;
92        }
93#endif
94    }
95}
96#endif /* CONFIG_HARDCODED_TABLES */
97
98#endif /* AVCODEC_DV_TABLEGEN_H */