61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/*
|
|
* Header file for hardcoded MDCT tables
|
|
*
|
|
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
|
|
*
|
|
* 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 <assert.h>
|
|
// do not use libavutil/libm.h since this is compiled both
|
|
// for the host and the target and config.h is only valid for the target
|
|
#include <math.h>
|
|
#include "libavutil/attributes.h"
|
|
|
|
#if !CONFIG_HARDCODED_TABLES
|
|
SINETABLE( 32);
|
|
SINETABLE( 64);
|
|
SINETABLE( 128);
|
|
SINETABLE( 256);
|
|
SINETABLE( 512);
|
|
SINETABLE(1024);
|
|
SINETABLE(2048);
|
|
SINETABLE(4096);
|
|
#else
|
|
#include "libavcodec/mdct_tables.h"
|
|
#endif
|
|
|
|
SINETABLE_CONST float * const ff_sine_windows[] = {
|
|
NULL, NULL, NULL, NULL, NULL, // unused
|
|
ff_sine_32 , ff_sine_64 ,
|
|
ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
|
|
};
|
|
|
|
// Generate a sine window.
|
|
av_cold void ff_sine_window_init(float *window, int n) {
|
|
int i;
|
|
for(i = 0; i < n; i++)
|
|
window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
|
|
}
|
|
|
|
av_cold void ff_init_ff_sine_windows(int index) {
|
|
assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
|
|
#if !CONFIG_HARDCODED_TABLES
|
|
ff_sine_window_init(ff_sine_windows[index], 1 << index);
|
|
#endif
|
|
}
|