1/*
2 * Header file for hardcoded sine windows
3 *
4 * Copyright (c) 2009 Reimar Döffinger <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#ifndef AVCODEC_SINEWIN_FIXED_TABLEGEN_H
24#define AVCODEC_SINEWIN_FIXED_TABLEGEN_H
25
26#ifdef BUILD_TABLES
27#undef DECLARE_ALIGNED
28#define DECLARE_ALIGNED(align, type, name) type name
29#else
30#include "libavutil/mem_internal.h"
31#endif
32
33#define SINETABLE(size) \
34    static SINETABLE_CONST DECLARE_ALIGNED(32, int, sine_##size##_fixed)[size]
35
36#if CONFIG_HARDCODED_TABLES
37#define init_sine_windows_fixed()
38#define SINETABLE_CONST const
39#include "libavcodec/sinewin_fixed_tables.h"
40#else
41// do not use libavutil/libm.h since this is compiled both
42// for the host and the target and config.h is only valid for the target
43#include <math.h>
44#include "libavutil/attributes.h"
45
46#define SINETABLE_CONST
47SINETABLE( 128);
48SINETABLE( 512);
49SINETABLE(1024);
50
51#define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
52
53// Generate a sine window.
54static av_cold void sine_window_init_fixed(int *window, int n)
55{
56    for (int i = 0; i < n; i++)
57        window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
58}
59
60static av_cold void init_sine_windows_fixed(void)
61{
62    sine_window_init_fixed(sine_128_fixed,  128);
63    sine_window_init_fixed(sine_512_fixed,  512);
64    sine_window_init_fixed(sine_1024_fixed, 1024);
65}
66#endif /* CONFIG_HARDCODED_TABLES */
67#endif /* AVCODEC_SINEWIN_FIXED_TABLEGEN_H */
68