| 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 <math.h> | ||
| 20 | |||
| 21 | #include "libavutil/avassert.h" | ||
| 22 | #include "libavutil/mathematics.h" | ||
| 23 | #include "libavutil/attributes.h" | ||
| 24 | #include "kbdwin.h" | ||
| 25 | |||
| 26 | 1666 | av_cold static void kbd_window_init(float *float_window, int *int_window, float alpha, int n) | |
| 27 | { | ||
| 28 | int i; | ||
| 29 | 1666 | double sum = 0.0, tmp; | |
| 30 | 1666 | double scale = 0.0; | |
| 31 | double temp[FF_KBD_WINDOW_MAX / 2 + 1]; | ||
| 32 | 1666 | double alpha2 = 4 * (alpha * M_PI / n) * (alpha * M_PI / n); | |
| 33 | |||
| 34 |
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1666 | av_assert0(n <= FF_KBD_WINDOW_MAX); |
| 35 | |||
| 36 |
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451504 | for (i = 0; i <= n / 2; i++) { |
| 37 | 449838 | tmp = i * (n - i) * alpha2; | |
| 38 | 449838 | temp[i] = av_bessel_i0(sqrt(tmp)); | |
| 39 |
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449838 | scale += temp[i] * (1 + (i && i<n/2)); |
| 40 | } | ||
| 41 | 1666 | scale = 1.0/(scale + 1); | |
| 42 | |||
| 43 |
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451504 | for (i = 0; i <= n / 2; i++) { |
| 44 | 449838 | sum += temp[i]; | |
| 45 |
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449838 | if (float_window) float_window[i] = sqrt(sum * scale); |
| 46 | 20975 | else int_window[i] = lrint(2147483647 * sqrt(sum * scale)); | |
| 47 | } | ||
| 48 |
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448172 | for (; i < n; i++) { |
| 49 | 446506 | sum += temp[n - i]; | |
| 50 |
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446506 | if (float_window) float_window[i] = sqrt(sum * scale); |
| 51 | 20809 | else int_window[i] = lrint(2147483647 * sqrt(sum * scale)); | |
| 52 | } | ||
| 53 | 1666 | } | |
| 54 | |||
| 55 | 1583 | av_cold void ff_kbd_window_init(float *window, float alpha, int n) | |
| 56 | { | ||
| 57 | 1583 | kbd_window_init(window, NULL, alpha, n); | |
| 58 | 1583 | } | |
| 59 | |||
| 60 | 83 | av_cold void ff_kbd_window_init_fixed(int32_t *window, float alpha, int n) | |
| 61 | { | ||
| 62 | 83 | kbd_window_init(NULL, window, alpha, n); | |
| 63 | 83 | } | |
| 64 |