FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavfilter/generate_wave_table.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 18 45 40.0%
Functions: 1 1 100.0%
Branches: 6 17 35.3%

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 "libavutil/avassert.h"
21 #include "avfilter.h"
22 #include "generate_wave_table.h"
23
24 1 void ff_generate_wave_table(enum WaveType wave_type,
25 enum AVSampleFormat sample_fmt,
26 void *table, int table_size,
27 double min, double max, double phase)
28 {
29 1 uint32_t i, phase_offset = phase / M_PI / 2 * table_size + 0.5;
30
31
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881895 for (i = 0; i < table_size; i++) {
32 881894 uint32_t point = (i + phase_offset) % table_size;
33 double d;
34
35
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881894 switch (wave_type) {
36 881894 case WAVE_SIN:
37 881894 d = (sin((double)point / table_size * 2 * M_PI) + 1) / 2;
38 881894 break;
39 case WAVE_TRI:
40 d = (double)point * 2 / table_size;
41 switch (4 * point / table_size) {
42 case 0: d = d + 0.5; break;
43 case 1:
44 case 2: d = 1.5 - d; break;
45 case 3: d = d - 1.5; break;
46 }
47 break;
48 default:
49 av_assert0(0);
50 }
51
52 881894 d = d * (max - min) + min;
53
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881894 switch (sample_fmt) {
54 case AV_SAMPLE_FMT_FLT: {
55 float *fp = (float *)table;
56 *fp++ = (float)d;
57 table = fp;
58 continue; }
59 case AV_SAMPLE_FMT_DBL: {
60 double *dp = (double *)table;
61 *dp++ = d;
62 table = dp;
63 continue; }
64 }
65
66
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881894 d += d < 0 ? -0.5 : 0.5;
67
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881894 switch (sample_fmt) {
68 case AV_SAMPLE_FMT_S16: {
69 int16_t *sp = table;
70 *sp++ = (int16_t)d;
71 table = sp;
72 continue; }
73 881894 case AV_SAMPLE_FMT_S32: {
74 881894 int32_t *ip = table;
75 881894 *ip++ = (int32_t)d;
76 881894 table = ip;
77 881894 continue; }
78 default:
79 av_assert0(0);
80 }
81 }
82 1 }
83