mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2026-11-06 05:17:42 +00:00
Kacper Michajłow
24914d60df
It only wrapped math.h and mathematics.h since the fallbacks went away. Include math.h and mathematics.h directly where needed. internal.h keeps both so that the many translation units relying on them transitively keep building. Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <math.h>
|
|
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/mathematics.h"
|
|
#include "libavutil/attributes.h"
|
|
#include "kbdwin.h"
|
|
|
|
av_cold static void kbd_window_init(float *float_window, int *int_window, float alpha, int n)
|
|
{
|
|
int i;
|
|
double sum = 0.0, tmp;
|
|
double scale = 0.0;
|
|
double temp[FF_KBD_WINDOW_MAX / 2 + 1];
|
|
double alpha2 = 4 * (alpha * M_PI / n) * (alpha * M_PI / n);
|
|
|
|
av_assert0(n <= FF_KBD_WINDOW_MAX);
|
|
|
|
for (i = 0; i <= n / 2; i++) {
|
|
tmp = i * (n - i) * alpha2;
|
|
temp[i] = av_bessel_i0(sqrt(tmp));
|
|
scale += temp[i] * (1 + (i && i<n/2));
|
|
}
|
|
scale = 1.0/(scale + 1);
|
|
|
|
for (i = 0; i <= n / 2; i++) {
|
|
sum += temp[i];
|
|
if (float_window) float_window[i] = sqrt(sum * scale);
|
|
else int_window[i] = lrint(2147483647 * sqrt(sum * scale));
|
|
}
|
|
for (; i < n; i++) {
|
|
sum += temp[n - i];
|
|
if (float_window) float_window[i] = sqrt(sum * scale);
|
|
else int_window[i] = lrint(2147483647 * sqrt(sum * scale));
|
|
}
|
|
}
|
|
|
|
av_cold void ff_kbd_window_init(float *window, float alpha, int n)
|
|
{
|
|
kbd_window_init(window, NULL, alpha, n);
|
|
}
|
|
|
|
av_cold void ff_kbd_window_init_fixed(int32_t *window, float alpha, int n)
|
|
{
|
|
kbd_window_init(NULL, window, alpha, n);
|
|
}
|