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/*
* 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
}
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