FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/vorbis.c
Date: 2025-10-10 03:51:19
Exec Total Coverage
Lines: 108 118 91.5%
Functions: 6 6 100.0%
Branches: 67 82 81.7%
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1 /**
2 * @file
3 * Common code for Vorbis I encoder and decoder
4 * @author Denes Balatoni ( dbalatoni programozo hu )
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 /**
24 * @file
25 * Common code for Vorbis I encoder and decoder
26 * @author Denes Balatoni ( dbalatoni programozo hu )
27 */
28
29 #include "libavutil/common.h"
30 #include "libavutil/error.h"
31 #include "libavutil/log.h"
32 #include "libavutil/macros.h"
33
34 #include "vorbis.h"
35 #include "vorbis_data.h"
36
37
38 /* Helper functions */
39
40 // x^(1/n)
41 959 unsigned int ff_vorbis_nth_root(unsigned int x, unsigned int n)
42 {
43 959 unsigned int ret = 0, i, j;
44
45 do {
46 18734 ++ret;
47
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 33138 for (i = 0, j = ret; i < n - 1; i++)
48 14404 j *= ret;
49
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 18734 } while (j <= x);
50
51 959 return ret - 1;
52 }
53
54 // Generate vlc codes from vorbis huffman code lengths
55
56 // the two bits[p] > 32 checks should be redundant, all calling code should
57 // already ensure that, but since it allows overwriting the stack it seems
58 // reasonable to check redundantly.
59 2145 int ff_vorbis_len2vlc(uint8_t *bits, uint32_t *codes, unsigned num)
60 {
61 2145 uint32_t exit_at_level[33] = { 404 };
62 unsigned i, j, p, code;
63
64
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 15011 for (p = 0; (p < num) && (bits[p] == 0); ++p)
65 ;
66
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 2145 if (p == num)
67 ✗ return 0;
68
69 2145 codes[p] = 0;
70
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 2145 if (bits[p] > 32)
71 ✗ return AVERROR_INVALIDDATA;
72
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 9497 for (i = 0; i < bits[p]; ++i)
73 7352 exit_at_level[i+1] = 1u << i;
74
75 2145 ++p;
76
77
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 2145 for (i = p; (i < num) && (bits[i] == 0); ++i)
78 ;
79
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 2145 if (i == num)
80 ✗ return 0;
81
82
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 420917 for (; p < num; ++p) {
83
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 418772 if (bits[p] > 32)
84 ✗ return AVERROR_INVALIDDATA;
85
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 418772 if (bits[p] == 0)
86 7798 continue;
87 // find corresponding exit(node which the tree can grow further from)
88
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 814596 for (i = bits[p]; i > 0; --i)
89
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 814596 if (exit_at_level[i])
90 410974 break;
91
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 410974 if (!i) // overspecified tree
92 ✗ return AVERROR_INVALIDDATA;
93 410974 code = exit_at_level[i];
94 410974 exit_at_level[i] = 0;
95 // construct code (append 0s to end) and introduce new exits
96
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 814596 for (j = i + 1 ;j <= bits[p]; ++j)
97 403622 exit_at_level[j] = code + (1u << (j - 1));
98 410974 codes[p] = code;
99 }
100
101 //no exits should be left (underspecified tree - ie. unused valid vlcs - not allowed by SPEC)
102
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103
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 68640 if (exit_at_level[p])
104 ✗ return AVERROR_INVALIDDATA;
105
106 2145 return 0;
107 }
108
109 93 int ff_vorbis_ready_floor1_list(void *logctx,
110 vorbis_floor1_entry *list, int values)
111 {
112 int i;
113 93 list[0].sort = 0;
114 93 list[1].sort = 1;
115
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 1806 for (i = 2; i < values; i++) {
116 int j;
117 1713 list[i].low = 0;
118 1713 list[i].high = 1;
119 1713 list[i].sort = i;
120
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 21537 for (j = 2; j < i; j++) {
121 19824 int tmp = list[j].x;
122
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 19824 if (tmp < list[i].x) {
123
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 13796 if (tmp > list[list[i].low].x)
124 2512 list[i].low = j;
125 } else {
126
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 6028 if (tmp < list[list[i].high].x)
127 2358 list[i].high = j;
128 }
129 }
130 }
131
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 1899 for (i = 0; i < values - 1; i++) {
132 int j;
133
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 25149 for (j = i + 1; j < values; j++) {
134
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 23343 if (list[i].x == list[j].x) {
135 ✗ av_log(logctx, AV_LOG_ERROR,
136 "Duplicate value found in floor 1 X coordinates\n");
137 ✗ return AVERROR_INVALIDDATA;
138 }
139
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 23343 if (list[list[i].sort].x > list[list[j].sort].x) {
140 7741 int tmp = list[i].sort;
141 7741 list[i].sort = list[j].sort;
142 7741 list[j].sort = tmp;
143 }
144 }
145 }
146 93 return 0;
147 }
148
149 78261 static inline void render_line_unrolled(intptr_t x, int y, int x1,
150 intptr_t sy, int ady, int adx,
151 float *buf)
152 {
153 78261 int err = -adx;
154 78261 x -= x1 - 1;
155 78261 buf += x1 - 1;
156
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 6460891 while (++x < 0) {
157 6382630 err += ady;
158
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 6382630 if (err >= 0) {
159 658272 err += ady - adx;
160 658272 y += sy;
161 658272 buf[x++] = ff_vorbis_floor1_inverse_db_table[av_clip_uint8(y)];
162 }
163 6382630 buf[x] = ff_vorbis_floor1_inverse_db_table[av_clip_uint8(y)];
164 }
165
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 78261 if (x <= 0) {
166
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 65513 if (err + ady >= 0)
167 ✗ y += sy;
168 65513 buf[x] = ff_vorbis_floor1_inverse_db_table[av_clip_uint8(y)];
169 }
170 78261 }
171
172 130157 static void render_line(int x0, int y0, int x1, int y1, float *buf)
173 {
174 130157 int dy = y1 - y0;
175 130157 int adx = x1 - x0;
176 130157 int ady = FFABS(dy);
177
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 130157 int sy = dy < 0 ? -1 : 1;
178 130157 buf[x0] = ff_vorbis_floor1_inverse_db_table[av_clip_uint8(y0)];
179
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 130157 if (ady*2 <= adx) { // optimized common case
180 78261 render_line_unrolled(x0, y0, x1, sy, ady, adx, buf);
181 } else {
182 51896 int base = dy / adx;
183 51896 int x = x0;
184 51896 int y = y0;
185 51896 int err = -adx;
186 51896 ady -= FFABS(base) * adx;
187
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 650412 while (++x < x1) {
188 598516 y += base;
189 598516 err += ady;
190
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 598516 if (err >= 0) {
191 290755 err -= adx;
192 290755 y += sy;
193 }
194 598516 buf[x] = ff_vorbis_floor1_inverse_db_table[av_clip_uint8(y)];
195 }
196 }
197 130157 }
198
199 10291 void ff_vorbis_floor1_render_list(vorbis_floor1_entry * list, int values,
200 uint16_t *y_list, int *flag,
201 int multiplier, float *out, int samples)
202 {
203 int lx, ly, i;
204 10291 lx = 0;
205 10291 ly = y_list[0] * multiplier;
206
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 249044 for (i = 1; i < values; i++) {
207 249044 int pos = list[i].sort;
208
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 249044 if (flag[pos]) {
209 130157 int x1 = list[pos].x;
210 130157 int y1 = y_list[pos] * multiplier;
211
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 130157 if (lx < samples)
212 130157 render_line(lx, ly, FFMIN(x1,samples), y1, out);
213 130157 lx = x1;
214 130157 ly = y1;
215 }
216
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 249044 if (lx >= samples)
217 10291 break;
218 }
219
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 10291 if (lx < samples)
220 ✗ render_line(lx, ly, samples, ly, out);
221 10291 }
222