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_TABLEGEN_H
24#define AVCODEC_SINEWIN_TABLEGEN_H
25
26#include <assert.h>
27// do not use libavutil/libm.h since this is compiled both
28// for the host and the target and config.h is only valid for the target
29#include <math.h>
30#include "libavutil/attributes.h"
31#include "libavutil/common.h"
32
33#if !CONFIG_HARDCODED_TABLES
34#ifndef BUILD_TABLES
35#include "libavutil/thread.h"
36#endif
37
38SINETABLE(  32);
39SINETABLE(  64);
40SINETABLE( 128);
41SINETABLE( 256);
42SINETABLE( 512);
43SINETABLE(1024);
44SINETABLE(2048);
45SINETABLE(4096);
46SINETABLE(8192);
47#else
48#include "libavcodec/sinewin_tables.h"
49#endif
50
51SINETABLE_CONST float *const ff_sine_windows[] = {
52    NULL, NULL, NULL, NULL, NULL, // unused
53    ff_sine_32,   ff_sine_64,   ff_sine_128,
54    ff_sine_256,  ff_sine_512,  ff_sine_1024,
55    ff_sine_2048, ff_sine_4096, ff_sine_8192,
56};
57
58// Generate a sine window.
59av_cold void ff_sine_window_init(float *window, int n)
60{
61    int i;
62    for(i = 0; i < n; i++)
63        window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
64}
65
66#if !CONFIG_HARDCODED_TABLES && !defined(BUILD_TABLES)
67#define INIT_FF_SINE_WINDOW_INIT_FUNC(index)        \
68static void init_ff_sine_window_ ## index(void)     \
69{                                                   \
70    ff_sine_window_init(ff_sine_windows[index], 1 << index);\
71}
72
73INIT_FF_SINE_WINDOW_INIT_FUNC(5)
74INIT_FF_SINE_WINDOW_INIT_FUNC(6)
75INIT_FF_SINE_WINDOW_INIT_FUNC(7)
76INIT_FF_SINE_WINDOW_INIT_FUNC(8)
77INIT_FF_SINE_WINDOW_INIT_FUNC(9)
78INIT_FF_SINE_WINDOW_INIT_FUNC(10)
79INIT_FF_SINE_WINDOW_INIT_FUNC(11)
80INIT_FF_SINE_WINDOW_INIT_FUNC(12)
81INIT_FF_SINE_WINDOW_INIT_FUNC(13)
82
83static void (*const sine_window_init_func_array[])(void) = {
84    init_ff_sine_window_5,
85    init_ff_sine_window_6,
86    init_ff_sine_window_7,
87    init_ff_sine_window_8,
88    init_ff_sine_window_9,
89    init_ff_sine_window_10,
90    init_ff_sine_window_11,
91    init_ff_sine_window_12,
92    init_ff_sine_window_13,
93};
94
95static AVOnce init_sine_window_once[9] = {
96    AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT,
97    AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT
98};
99#endif
100
101av_cold void ff_init_ff_sine_windows(int index)
102{
103    assert(index >= 5 && index < FF_ARRAY_ELEMS(ff_sine_windows));
104#if !CONFIG_HARDCODED_TABLES
105#ifdef BUILD_TABLES
106    ff_sine_window_init(ff_sine_windows[index], 1 << index);
107#else
108    ff_thread_once(&init_sine_window_once[index - 5], sine_window_init_func_array[index - 5]);
109#endif
110#endif
111}
112
113#endif /* AVCODEC_SINEWIN_TABLEGEN_H */
114