1/*
2 * Header file for hardcoded MDCT tables
3 *
4 * Copyright (c) 2009 Reimar D��ffinger <Reimar.Doeffinger@gmx.de>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <assert.h>
24// do not use libavutil/mathematics.h since this is compiled both
25// for the host and the target and config.h is only valid for the target
26#include <math.h>
27#include "../libavutil/attributes.h"
28
29#if !CONFIG_HARDCODED_TABLES
30SINETABLE(  32);
31SINETABLE(  64);
32SINETABLE( 128);
33SINETABLE( 256);
34SINETABLE( 512);
35SINETABLE(1024);
36SINETABLE(2048);
37SINETABLE(4096);
38#else
39#include "libavcodec/mdct_tables.h"
40#endif
41
42SINETABLE_CONST float * const ff_sine_windows[] = {
43    NULL, NULL, NULL, NULL, NULL, // unused
44    ff_sine_32 , ff_sine_64 ,
45    ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
46};
47
48// Generate a sine window.
49av_cold void ff_sine_window_init(float *window, int n) {
50    int i;
51    for(i = 0; i < n; i++)
52        window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
53}
54
55av_cold void ff_init_ff_sine_windows(int index) {
56    assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
57#if !CONFIG_HARDCODED_TABLES
58    ff_sine_window_init(ff_sine_windows[index], 1 << index);
59#endif
60}
61