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/*
* Header file for hardcoded sine windows
*
* 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
*/
#ifndef AVCODEC_SINEWIN_TABLEGEN_H
#define AVCODEC_SINEWIN_TABLEGEN_H
#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"
#include "libavutil/common.h"
#if !CONFIG_HARDCODED_TABLES
SINETABLE( 32);
SINETABLE( 64);
SINETABLE( 128);
SINETABLE( 256);
SINETABLE( 512);
SINETABLE(1024);
SINETABLE(2048);
SINETABLE(4096);
SINETABLE(8192);
#else
#if USE_FIXED
#include "libavcodec/sinewin_fixed_tables.h"
#else
#include "libavcodec/sinewin_tables.h"
#endif
#endif
#if USE_FIXED
#define SINEWIN_SUFFIX(a) a ## _fixed
#define INTFLOAT int
#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
#else
#define SINEWIN_SUFFIX(a) a
#define INTFLOAT float
#define SIN_FIX(a) a
#endif
SINETABLE_CONST INTFLOAT * const SINEWIN_SUFFIX(ff_sine_windows)[] = {
NULL, NULL, NULL, NULL, NULL, // unused
SINEWIN_SUFFIX(ff_sine_32) , SINEWIN_SUFFIX(ff_sine_64), SINEWIN_SUFFIX(ff_sine_128),
SINEWIN_SUFFIX(ff_sine_256), SINEWIN_SUFFIX(ff_sine_512), SINEWIN_SUFFIX(ff_sine_1024),
SINEWIN_SUFFIX(ff_sine_2048), SINEWIN_SUFFIX(ff_sine_4096), SINEWIN_SUFFIX(ff_sine_8192)
};
// Generate a sine window.
av_cold void SINEWIN_SUFFIX(ff_sine_window_init)(INTFLOAT *window, int n) {
int i;
for(i = 0; i < n; i++)
window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
}
av_cold void SINEWIN_SUFFIX(ff_init_ff_sine_windows)(int index) {
assert(index >= 0 && index < FF_ARRAY_ELEMS(SINEWIN_SUFFIX(ff_sine_windows)));
#if !CONFIG_HARDCODED_TABLES
SINEWIN_SUFFIX(ff_sine_window_init)(SINEWIN_SUFFIX(ff_sine_windows)[index], 1 << index);
#endif
}
#endif /* AVCODEC_SINEWIN_TABLEGEN_H */
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