FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/rl.c
Date: 2022-01-21 12:56:39
Exec Total Coverage
Lines: 55 55 100.0%
Branches: 29 30 96.7%

Line Branch Exec Source
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include <stdint.h>
20 #include <string.h>
21
22 #include "libavutil/attributes.h"
23 #include "libavutil/avassert.h"
24
25 #include "rl.h"
26
27 1212 av_cold void ff_rl_init(RLTable *rl,
28 uint8_t static_store[2][2 * MAX_RUN + MAX_LEVEL + 3])
29 {
30 int last, run, level, start, end, i;
31
32 /* compute max_level[], max_run[] and index_run[] */
33
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3636 for (last = 0; last < 2; last++) {
34 2424 int8_t *max_level = static_store[last];
35 2424 int8_t *max_run = static_store[last] + MAX_RUN + 1;
36 2424 uint8_t *index_run = static_store[last] + MAX_RUN + 1 + MAX_LEVEL + 1;
37
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2424 if (last == 0) {
38 1212 start = 0;
39 1212 end = rl->last;
40 } else {
41 1212 start = rl->last;
42 1212 end = rl->n;
43 }
44
45 2424 memset(index_run, rl->n, MAX_RUN + 1);
46
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153066 for (i = start; i < end; i++) {
47 150642 run = rl->table_run[i];
48 150642 level = rl->table_level[i];
49
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150642 if (index_run[run] == rl->n)
50 68568 index_run[run] = i;
51
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150642 if (level > max_level[run])
52 150636 max_level[run] = level;
53
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150642 if (run > max_run[level])
54 118770 max_run[level] = run;
55 }
56 2424 rl->max_level[last] = max_level;
57 2424 rl->max_run[last] = max_run;
58 2424 rl->index_run[last] = index_run;
59 }
60 1212 }
61
62 858 av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
63 {
64 int i, q;
65 858 VLC_TYPE table[1500][2] = {{0}};
66 858 VLC vlc = { .table = table, .table_allocated = static_size };
67
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858 av_assert0(static_size <= FF_ARRAY_ELEMS(table));
68 858 init_vlc(&vlc, 9, rl->n + 1, &rl->table_vlc[0][1], 4, 2, &rl->table_vlc[0][0], 4, 2, INIT_VLC_USE_NEW_STATIC);
69
70
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12752 for (q = 0; q < 32; q++) {
71 12396 int qmul = q * 2;
72 12396 int qadd = (q - 1) | 1;
73
74
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12396 if (!rl->rl_vlc[q])
75 502 return;
76
77
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11894 if (q == 0) {
78 858 qmul = 1;
79 858 qadd = 0;
80 }
81
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9362158 for (i = 0; i < vlc.table_size; i++) {
82 9350264 int code = vlc.table[i][0];
83 9350264 int len = vlc.table[i][1];
84 int level, run;
85
86
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9350264 if (len == 0) { // illegal code
87 94592 run = 66;
88 94592 level = MAX_LEVEL;
89
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9255672 } else if (len < 0) { // more bits needed
90 176020 run = 0;
91 176020 level = code;
92 } else {
93
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9079652 if (code == rl->n) { // esc
94 127923 run = 66;
95 127923 level = 0;
96 } else {
97 8951729 run = rl->table_run[code] + 1;
98 8951729 level = rl->table_level[code] * qmul + qadd;
99
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8951729 if (code >= rl->last) run += 192;
100 }
101 }
102 9350264 rl->rl_vlc[q][i].len = len;
103 9350264 rl->rl_vlc[q][i].level = level;
104 9350264 rl->rl_vlc[q][i].run = run;
105 }
106 }
107 }
108