FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cfhddata.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 36 39 92.3%
Functions: 2 2 100.0%
Branches: 14 18 77.8%
Line Branch Exec Source
1 /*
2 * Copyright (c) 2015 Kieran Kunhya
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdint.h>
22
23 #include "libavutil/attributes.h"
24
25 #include "cfhd.h"
26 #include "vlc.h"
27
28 #define NB_VLC_TABLE_9 (71 + 3)
29 #define NB_VLC_TABLE_18 (263 + 1)
30
31 typedef struct CFHD_RL_ELEM {
32 uint16_t run;
33 uint8_t level;
34 uint8_t len;
35 } CFHD_RL_ELEM;
36
37 static const CFHD_RL_ELEM table_9_vlc[NB_VLC_TABLE_9] = {
38 { 1, 0, 1 }, { 1, 1, 2 }, { 1, 2, 4 }, { 1, 3, 5 },
39 { 1, 6, 7 }, { 1, 15, 11 }, { 1, 26, 14 }, { 1, 27, 14 },
40 { 1, 23, 13 }, { 1, 36, 16 }, { 1, 40, 17 }, { 1, 41, 17 },
41 { 1, 32, 15 }, { 1, 48, 19 }, { 1, 49, 19 }, { 1, 51, 20 },
42 { 1, 52, 20 }, { 1, 50, 19 }, { 1, 42, 17 }, { 1, 37, 16 },
43 { 1, 33, 15 }, { 1, 24, 13 }, { 1, 13, 10 }, { 1, 10, 9 },
44 { 1, 8, 8 }, { 1, 5, 6 }, { 80, 0, 8 }, { 1, 16, 11 },
45 { 1, 19, 12 }, { 1, 20, 12 }, { 1, 14, 10 }, { 120, 0, 9 },
46 { 320, 0, 8 }, { 1, 11, 9 }, { 1, 28, 14 }, { 1, 29, 14 },
47 { 1, 25, 13 }, { 1, 21, 12 }, { 1, 17, 11 }, { 1, 34, 15 },
48 { 1, 45, 18 }, { 1, 46, 18 }, { 1, 47, 18 }, { 1, 57, 23 },
49 { 1, 58, 23 }, { 1, 59, 23 }, { 1, 62, 24 }, { 1, 63, 24 },
50 { 1, 56, 22 }, { 1, 60, 23 }, { 1, 61, 24 }, { 1, 64, 25 },
51 { 0, 64, 26 }, { 1, 64, 26 }, { 1, 53, 20 }, { 1, 54, 20 },
52 { 1, 55, 20 }, { 1, 38, 16 }, { 1, 30, 14 }, { 1, 31, 14 },
53 { 1, 43, 17 }, { 1, 44, 17 }, { 1, 39, 16 }, { 1, 35, 15 },
54 { 1, 22, 12 }, { 1, 18, 11 }, { 32, 0, 6 }, { 12, 0, 5 },
55 { 1, 4, 5 }, { 160, 0, 6 }, { 1, 7, 7 }, { 1, 9, 8 },
56 { 100, 0, 9 }, { 1, 12, 9 },
57 };
58
59 static const CFHD_RL_ELEM table_18_vlc[NB_VLC_TABLE_18] = {
60 { 1, 0, 1 }, { 1, 1, 2 }, { 1, 4, 6 }, { 1, 14, 10 },
61 { 1, 23, 12 }, { 1, 41, 15 }, { 1, 54, 17 }, { 1, 69, 19 },
62 { 1, 77, 20 }, { 1, 85, 21 }, { 1, 108, 24 }, { 1, 237, 25 },
63 { 1, 238, 25 }, { 1, 101, 23 }, { 1, 172, 25 }, { 1, 173, 25 },
64 { 1, 170, 25 }, { 1, 171, 25 }, { 1, 227, 25 }, { 1, 162, 25 },
65 { 1, 156, 25 }, { 1, 157, 25 }, { 1, 243, 25 }, { 1, 134, 25 },
66 { 1, 135, 25 }, { 1, 136, 25 }, { 1, 128, 25 }, { 1, 129, 25 },
67 { 1, 247, 25 }, { 1, 127, 25 }, { 1, 178, 25 }, { 1, 179, 25 },
68 { 1, 214, 25 }, { 1, 118, 25 }, { 1, 204, 25 }, { 1, 205, 25 },
69 { 1, 198, 25 }, { 1, 199, 25 }, { 1, 245, 25 }, { 1, 246, 25 },
70 { 1, 242, 25 }, { 1, 244, 25 }, { 1, 230, 25 }, { 1, 119, 25 },
71 { 1, 193, 25 }, { 1, 194, 25 }, { 1, 186, 25 }, { 1, 187, 25 },
72 { 1, 211, 25 }, { 1, 190, 25 }, { 1, 163, 25 }, { 1, 164, 25 },
73 { 1, 220, 25 }, { 1, 221, 25 }, { 1, 216, 25 }, { 1, 217, 25 },
74 { 1, 212, 25 }, { 1, 213, 25 }, { 1, 206, 25 }, { 1, 208, 25 },
75 { 1, 209, 25 }, { 1, 210, 25 }, { 1, 122, 25 }, { 1, 248, 25 },
76 { 1, 235, 25 }, { 1, 148, 25 }, { 1, 253, 25 }, { 1, 254, 25 },
77 { 1, 123, 25 }, { 1, 124, 25 }, { 1, 215, 25 }, { 1, 117, 25 },
78 { 1, 234, 25 }, { 1, 236, 25 }, { 1, 142, 25 }, { 1, 143, 25 },
79 { 1, 153, 25 }, { 1, 154, 25 }, { 1, 176, 25 }, { 1, 177, 25 },
80 { 1, 174, 25 }, { 1, 175, 25 }, { 1, 184, 25 }, { 1, 185, 25 },
81 { 1, 240, 25 }, { 1, 241, 25 }, { 1, 239, 25 }, { 1, 141, 25 },
82 { 1, 139, 25 }, { 1, 140, 25 }, { 1, 125, 25 }, { 1, 126, 25 },
83 { 1, 130, 25 }, { 1, 131, 25 }, { 1, 228, 25 }, { 1, 229, 25 },
84 { 1, 232, 25 }, { 1, 233, 25 }, { 1, 132, 25 }, { 1, 133, 25 },
85 { 1, 137, 25 }, { 1, 138, 25 }, { 1, 255, 25 }, { 1, 116, 26 },
86 { 0, 255, 26 }, { 1, 249, 25 }, { 1, 250, 25 }, { 1, 251, 25 },
87 { 1, 252, 25 }, { 1, 120, 25 }, { 1, 121, 25 }, { 1, 222, 25 },
88 { 1, 224, 25 }, { 1, 218, 25 }, { 1, 219, 25 }, { 1, 200, 25 },
89 { 1, 201, 25 }, { 1, 191, 25 }, { 1, 192, 25 }, { 1, 149, 25 },
90 { 1, 150, 25 }, { 1, 151, 25 }, { 1, 152, 25 }, { 1, 146, 25 },
91 { 1, 147, 25 }, { 1, 144, 25 }, { 1, 145, 25 }, { 1, 165, 25 },
92 { 1, 166, 25 }, { 1, 167, 25 }, { 1, 168, 25 }, { 1, 158, 25 },
93 { 1, 159, 25 }, { 1, 223, 25 }, { 1, 169, 25 }, { 1, 207, 25 },
94 { 1, 197, 25 }, { 1, 202, 25 }, { 1, 203, 25 }, { 1, 188, 25 },
95 { 1, 189, 25 }, { 1, 225, 25 }, { 1, 226, 25 }, { 1, 195, 25 },
96 { 1, 196, 25 }, { 1, 182, 25 }, { 1, 183, 25 }, { 1, 231, 25 },
97 { 1, 155, 25 }, { 1, 160, 25 }, { 1, 161, 25 }, { 1, 48, 16 },
98 { 1, 36, 14 }, { 1, 30, 13 }, { 1, 19, 11 }, { 1, 11, 9 },
99 { 32, 0, 9 }, { 1, 15, 10 }, { 1, 24, 12 }, { 1, 42, 15 },
100 { 1, 62, 18 }, { 1, 70, 19 }, { 1, 94, 22 }, { 1, 180, 25 },
101 { 1, 181, 25 }, { 1, 109, 24 }, { 1, 102, 23 }, { 1, 86, 21 },
102 { 1, 78, 20 }, { 1, 55, 17 }, { 1, 49, 16 }, { 1, 37, 14 },
103 { 1, 31, 13 }, { 1, 25, 12 }, { 1, 43, 15 }, { 1, 63, 18 },
104 { 1, 71, 19 }, { 1, 79, 20 }, { 1, 87, 21 }, { 1, 88, 21 },
105 { 1, 56, 17 }, { 1, 50, 16 }, { 1, 38, 14 }, { 180, 0, 13 },
106 { 1, 6, 7 }, { 1, 3, 5 }, { 1, 12, 9 }, { 1, 20, 11 },
107 { 100, 0, 11 }, { 60, 0, 10 }, { 20, 0, 8 }, { 12, 0, 7 },
108 { 1, 9, 8 }, { 1, 16, 10 }, { 1, 32, 13 }, { 1, 44, 15 },
109 { 1, 64, 18 }, { 1, 72, 19 }, { 1, 80, 20 }, { 1, 95, 22 },
110 { 1, 96, 22 }, { 1, 110, 24 }, { 1, 111, 24 }, { 1, 103, 23 },
111 { 1, 104, 23 }, { 1, 105, 23 }, { 1, 57, 17 }, { 1, 65, 18 },
112 { 1, 73, 19 }, { 1, 81, 20 }, { 1, 89, 21 }, { 1, 97, 22 },
113 { 1, 98, 22 }, { 1, 58, 17 }, { 1, 39, 14 }, { 1, 26, 12 },
114 { 1, 21, 11 }, { 1, 13, 9 }, { 1, 7, 7 }, { 1, 5, 6 },
115 { 1, 10, 8 }, { 1, 33, 13 }, { 1, 51, 16 }, { 1, 66, 18 },
116 { 1, 74, 19 }, { 1, 82, 20 }, { 1, 90, 21 }, { 1, 91, 21 },
117 { 1, 59, 17 }, { 1, 45, 15 }, { 1, 52, 16 }, { 1, 67, 18 },
118 { 1, 75, 19 }, { 1, 83, 20 }, { 1, 112, 24 }, { 1, 113, 24 },
119 { 1, 106, 23 }, { 1, 99, 22 }, { 1, 92, 21 }, { 1, 68, 18 },
120 { 1, 76, 19 }, { 1, 84, 20 }, { 1, 107, 23 }, { 1, 114, 24 },
121 { 1, 115, 24 }, { 1, 100, 22 }, { 1, 93, 21 }, { 1, 46, 15 },
122 { 1, 27, 12 }, { 1, 34, 13 }, { 320, 0, 13 }, { 1, 28, 12 },
123 { 1, 17, 10 }, { 1, 22, 11 }, { 1, 40, 14 }, { 1, 53, 16 },
124 { 1, 60, 17 }, { 1, 61, 17 }, { 1, 47, 15 }, { 1, 35, 13 },
125 { 1, 29, 12 }, { 1, 18, 10 }, { 1, 8, 7 }, { 1, 2, 3 },
126 };
127
128 12 static av_cold int cfhd_init_vlc(CFHD_RL_VLC_ELEM out[], unsigned out_size,
129 const CFHD_RL_ELEM table_vlc[], unsigned table_size,
130 CFHD_RL_VLC_ELEM tmp[], void *logctx)
131 {
132 VLC vlc;
133 unsigned j;
134 int ret;
135
136 /** Similar to dv.c, generate signed VLC tables **/
137
138
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 2040 for (unsigned i = j = 0; i < table_size; i++, j++) {
139 2028 tmp[j].len8 = table_vlc[i].len;
140 2028 tmp[j].run = table_vlc[i].run;
141 2028 tmp[j].level = table_vlc[i].level;
142
143 /* Don't include the zero level nor escape bits */
144
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 2028 if (table_vlc[i].level && table_vlc[i].run) {
145 1920 tmp[j].len8++;
146 1920 j++;
147 1920 tmp[j].len8 = table_vlc[i].len + 1;
148 1920 tmp[j].run = table_vlc[i].run;
149 1920 tmp[j].level = -table_vlc[i].level;
150 }
151 }
152
153 12 ret = ff_vlc_init_from_lengths(&vlc, VLC_BITS, j,
154 12 &tmp[0].len8, sizeof(tmp[0]),
155 NULL, 0, 0, 0, 0, logctx);
156
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 12 if (ret < 0)
157 ✗ return ret;
158
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 12 av_assert0(vlc.table_size == out_size);
159
160
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 39972 for (unsigned i = out_size; i-- > 0;) {
161 39960 int code = vlc.table[i].sym;
162 39960 int len = vlc.table[i].len;
163 int level, run;
164
165
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 39960 if (len < 0) { // more bits needed
166 222 run = 0;
167 222 level = code;
168 } else {
169 39738 run = tmp[code].run;
170 39738 level = tmp[code].level;
171 }
172 39960 out[i].len8 = len;
173 39960 out[i].level = level;
174 39960 out[i].run = run;
175 }
176 12 ff_vlc_free(&vlc);
177
178 12 return 0;
179 }
180
181 6 av_cold int ff_cfhd_init_vlcs(CFHDContext *s)
182 {
183 int ret;
184
185 /* Table 18 - we reuse the unused table_9_rl_vlc as scratch buffer here */
186 6 ret = cfhd_init_vlc(s->table_18_rl_vlc, FF_ARRAY_ELEMS(s->table_18_rl_vlc),
187 table_18_vlc, FF_ARRAY_ELEMS(table_18_vlc),
188 6 s->table_9_rl_vlc, s->avctx);
189
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 6 if (ret < 0)
190 ✗ return ret;
191 /* Table 9 - table_9_rl_vlc itself is used as scratch buffer; it works
192 * because we are counting down in the final loop */
193 6 ret = cfhd_init_vlc(s->table_9_rl_vlc, FF_ARRAY_ELEMS(s->table_9_rl_vlc),
194 table_9_vlc, FF_ARRAY_ELEMS(table_9_vlc),
195 6 s->table_9_rl_vlc, s->avctx);
196
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 6 if (ret < 0)
197 ✗ return ret;
198 6 return 0;
199 }
200