| 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 | 1191 | av_cold static void kbd_window_init(float *float_window, int *int_window, float alpha, int n) | |
| 26 | { | ||
| 27 | int i; | ||
| 28 | 1191 | double sum = 0.0, tmp; | |
| 29 | 1191 | double scale = 0.0; | |
| 30 | double temp[FF_KBD_WINDOW_MAX / 2 + 1]; | ||
| 31 | 1191 | double alpha2 = 4 * (alpha * M_PI / n) * (alpha * M_PI / n); | |
| 32 | |||
| 33 |
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1191 | av_assert0(n <= FF_KBD_WINDOW_MAX); |
| 34 | |||
| 35 |
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321234 | for (i = 0; i <= n / 2; i++) { |
| 36 | 320043 | tmp = i * (n - i) * alpha2; | |
| 37 | 320043 | temp[i] = av_bessel_i0(sqrt(tmp)); | |
| 38 |
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320043 | scale += temp[i] * (1 + (i && i<n/2)); |
| 39 | } | ||
| 40 | 1191 | scale = 1.0/(scale + 1); | |
| 41 | |||
| 42 |
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321234 | for (i = 0; i <= n / 2; i++) { |
| 43 | 320043 | sum += temp[i]; | |
| 44 |
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320043 | 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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318852 | for (; i < n; i++) { |
| 48 | 317661 | sum += temp[n - i]; | |
| 49 |
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317661 | if (float_window) float_window[i] = sqrt(sum * scale); |
| 50 | 20524 | else int_window[i] = lrint(2147483647 * sqrt(sum * scale)); | |
| 51 | } | ||
| 52 | 1191 | } | |
| 53 | |||
| 54 | 1115 | av_cold void ff_kbd_window_init(float *window, float alpha, int n) | |
| 55 | { | ||
| 56 | 1115 | kbd_window_init(window, NULL, alpha, n); | |
| 57 | 1115 | } | |
| 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 |