FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/kbdwin.c
Date: 2024-03-28 14:59:00
Exec Total Coverage
Lines: 25 25 100.0%
Functions: 3 3 100.0%
Branches: 15 16 93.8%

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 "libavutil/avassert.h"
20 #include "libavutil/libm.h"
21 #include "libavutil/mathematics.h"
22 #include "libavutil/attributes.h"
23 #include "kbdwin.h"
24
25 839 av_cold static void kbd_window_init(float *float_window, int *int_window, float alpha, int n)
26 {
27 int i;
28 839 double sum = 0.0, tmp;
29 839 double scale = 0.0;
30 double temp[FF_KBD_WINDOW_MAX / 2 + 1];
31 839 double alpha2 = 4 * (alpha * M_PI / n) * (alpha * M_PI / n);
32
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839 av_assert0(n <= FF_KBD_WINDOW_MAX);
34
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220258 for (i = 0; i <= n / 2; i++) {
36 219419 tmp = i * (n - i) * alpha2;
37 219419 temp[i] = av_bessel_i0(sqrt(tmp));
38
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219419 scale += temp[i] * (1 + (i && i<n/2));
39 }
40 839 scale = 1.0/(scale + 1);
41
42
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220258 for (i = 0; i <= n / 2; i++) {
43 219419 sum += temp[i];
44
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219419 if (float_window) float_window[i] = sqrt(sum * scale);
45 20676 else int_window[i] = lrint(2147483647 * sqrt(sum * scale));
46 }
47
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218580 for (; i < n; i++) {
48 217741 sum += temp[n - i];
49
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217741 if (float_window) float_window[i] = sqrt(sum * scale);
50 20524 else int_window[i] = lrint(2147483647 * sqrt(sum * scale));
51 }
52 839 }
53
54 763 av_cold void ff_kbd_window_init(float *window, float alpha, int n)
55 {
56 763 kbd_window_init(window, NULL, alpha, n);
57 763 }
58
59 76 av_cold void ff_kbd_window_init_fixed(int32_t *window, float alpha, int n)
60 {
61 76 kbd_window_init(NULL, window, alpha, n);
62 76 }
63