FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/rl.c
Date: 2026-04-24 10:13:59
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 73 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 73 memset(index_run, n, MAX_RUN + 1);
33
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 8266 for (int i = 0; i < n; i++) {
34 8193 int run = table_run[i];
35 8193 int level = table_level[i];
36
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 8193 if (index_run[run] == n)
37 2336 index_run[run] = i;
38
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 8193 if (level > max_level[run])
39 8193 max_level[run] = level;
40 }
41 73 }
42
43 702 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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 2106 for (last = 0; last < 2; last++) {
50 1404 int8_t *max_level = static_store[last];
51 1404 int8_t *max_run = static_store[last] + MAX_RUN + 1;
52 1404 uint8_t *index_run = static_store[last] + MAX_RUN + 1 + MAX_LEVEL + 1;
53
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 1404 if (last == 0) {
54 702 start = 0;
55 702 end = rl->last;
56 } else {
57 702 start = rl->last;
58 702 end = rl->n;
59 }
60
61 1404 memset(index_run, rl->n, MAX_RUN + 1);
62
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 82683 for (i = start; i < end; i++) {
63 81279 run = rl->table_run[i];
64 81279 level = rl->table_level[i];
65
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 81279 if (index_run[run] == rl->n)
66 38761 index_run[run] = i;
67
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 81279 if (level > max_level[run])
68 81279 max_level[run] = level;
69
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 81279 if (run > max_run[level])
70 63901 max_run[level] = run;
71 }
72 1404 rl->max_level[last] = max_level;
73 1404 rl->max_run[last] = max_run;
74 1404 rl->index_run[last] = index_run;
75 }
76 702 }
77
78 781 av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
79 {
80 VLCElem *vlc;
81
82 781 ff_vlc_init_table_sparse(rl->rl_vlc[0], static_size, 9, rl->n + 1,
83 781 &rl->table_vlc[0][1], 4, 2,
84 781 &rl->table_vlc[0][0], 4, 2,
85 NULL, 0, 0, 0);
86
87 781 vlc = rl->rl_vlc[0];
88
89 // We count down to avoid trashing the first RL-VLC
90
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 25773 for (int q = 32; --q >= 0;) {
91 24992 int qmul = q * 2;
92 24992 int qadd = (q - 1) | 1;
93
94
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 24992 if (!rl->rl_vlc[q])
95 14229 continue;
96
97
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 10763 if (q == 0) {
98 781 qmul = 1;
99 781 qadd = 0;
100 }
101
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 8428423 for (unsigned i = 0; i < static_size; i++) {
102 8417660 int idx = vlc[i].sym;
103 8417660 int len = vlc[i].len;
104 int level, run;
105
106
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 8417660 if (len == 0) { // illegal code
107 101711 run = 66;
108 101711 level = MAX_LEVEL;
109
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 8315949 } else if (len < 0) { // more bits needed
110 158371 run = 0;
111 158371 level = idx;
112 } else {
113
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 8157578 if (idx == rl->n) { // esc
114 134106 run = 66;
115 134106 level = 0;
116 } else {
117 8023472 run = rl->table_run[idx] + 1;
118 8023472 level = rl->table_level[idx] * qmul + qadd;
119
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 8023472 if (idx >= rl->last) run += 192;
120 }
121 }
122 8417660 rl->rl_vlc[q][i].len8 = len;
123 8417660 rl->rl_vlc[q][i].level = level;
124 8417660 rl->rl_vlc[q][i].run = run;
125 }
126 }
127 781 }
128