FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/rl.c
Date: 2026-10-29 07:45:57
Exec Total Coverage
Lines: 66 66 100.0%
Functions: 3 3 100.0%
Branches: 32 34 94.1%
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
24 #include "rl.h"
25
26 87 av_cold void ff_rl_init_level_run(uint8_t max_level[MAX_LEVEL + 1],
27 uint8_t index_run[MAX_RUN + 1],
28 const uint8_t table_run[/* n */],
29 const uint8_t table_level[/* n*/],
30 int n)
31 {
32 87 memset(index_run, n, MAX_RUN + 1);
33
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 9834 for (int i = 0; i < n; i++) {
34 9747 int run = table_run[i];
35 9747 int level = table_level[i];
36
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 9747 if (index_run[run] == n)
37 2784 index_run[run] = i;
38
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 9747 if (level > max_level[run])
39 9747 max_level[run] = level;
40 }
41 87 }
42
43 764 av_cold void ff_rl_init(RLTable *rl,
44 uint8_t static_store[2][2 * MAX_RUN + MAX_LEVEL + 3])
45 {
46 int last, run, level, start, end, i;
47
48 /* compute max_level[], max_run[] and index_run[] */
49
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 2292 for (last = 0; last < 2; last++) {
50 1528 int8_t *max_level = static_store[last];
51 1528 int8_t *max_run = static_store[last] + MAX_RUN + 1;
52 1528 uint8_t *index_run = static_store[last] + MAX_RUN + 1 + MAX_LEVEL + 1;
53
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 1528 if (last == 0) {
54 764 start = 0;
55 764 end = rl->last;
56 } else {
57 764 start = rl->last;
58 764 end = rl->n;
59 }
60
61 1528 memset(index_run, rl->n, MAX_RUN + 1);
62
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 89356 for (i = start; i < end; i++) {
63 87828 run = rl->table_run[i];
64 87828 level = rl->table_level[i];
65
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 87828 if (index_run[run] == rl->n)
66 42058 index_run[run] = i;
67
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 87828 if (level > max_level[run])
68 87828 max_level[run] = level;
69
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 87828 if (run > max_run[level])
70 68904 max_run[level] = run;
71 }
72 1528 rl->max_level[last] = max_level;
73 1528 rl->max_run[last] = max_run;
74 1528 rl->index_run[last] = index_run;
75 }
76 764 }
77
78 863 av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
79 {
80 VLCElem *vlc;
81
82 863 ff_vlc_init_table_sparse(rl->rl_vlc[0], static_size, 9, rl->n + 1,
83 863 &rl->table_vlc[0][1], 4, 2,
84 863 &rl->table_vlc[0][0], 4, 2,
85 NULL, 0, 0, 0);
86
87 863 vlc = rl->rl_vlc[0];
88
89 // We count down to avoid trashing the first RL-VLC
90
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 28479 for (int q = 32; --q >= 0;) {
91 27616 int qmul = q * 2;
92 27616 int qadd = (q - 1) | 1;
93
94
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 27616 if (!rl->rl_vlc[q])
95 15748 continue;
96
97
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 11868 if (q == 0) {
98 863 qmul = 1;
99 863 qadd = 0;
100 }
101
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 9324154 for (unsigned i = 0; i < static_size; i++) {
102 9312286 int idx = vlc[i].sym;
103 9312286 int len = vlc[i].len;
104 int level, run;
105
106
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 9312286 if (len == 0) { // illegal code
107 116115 run = 66;
108 116115 level = MAX_LEVEL;
109
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 9196171 } else if (len < 0) { // more bits needed
110 174934 run = 0;
111 174934 level = idx;
112 } else {
113
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 9021237 if (idx == rl->n) { // esc
114 152191 run = 66;
115 152191 level = 0;
116 } else {
117 8869046 run = rl->table_run[idx] + 1;
118 8869046 level = rl->table_level[idx] * qmul + qadd;
119
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 8869046 if (idx >= rl->last) run += 192;
120 }
121 }
122 9312286 rl->rl_vlc[q][i].len8 = len;
123 9312286 rl->rl_vlc[q][i].level = level;
124 9312286 rl->rl_vlc[q][i].run = run;
125 }
126 }
127 863 }
128