FFmpeg
sinewin_fixed_tablegen.h
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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
47 SINETABLE( 128);
48 SINETABLE( 512);
49 SINETABLE(1024);
50 
51 #define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
52 
53 // Generate a sine window.
54 static 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 
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 */
static av_cold void init_sine_windows_fixed(void)
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
static av_cold void sine_window_init_fixed(int *window, int n)
static SDL_Window * window
Definition: ffplay.c:366
#define sinf(x)
Definition: libm.h:419
#define SIN_FIX(a)
#define SINETABLE(size)
#define M_PI
Definition: mathematics.h:52
int i
Definition: input.c:407