FFmpeg
sinewin_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_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 
38 SINETABLE( 32);
39 SINETABLE( 64);
40 SINETABLE( 128);
41 SINETABLE( 256);
42 SINETABLE( 512);
43 SINETABLE(1024);
44 SINETABLE(2048);
45 SINETABLE(4096);
46 SINETABLE(8192);
47 #else
48 #include "libavcodec/sinewin_tables.h"
49 #endif
50 
51 SINETABLE_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.
59 av_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) \
68 static void init_ff_sine_window_ ## index(void) \
69 { \
70  ff_sine_window_init(ff_sine_windows[index], 1 << index);\
71 }
72 
82 
83 static 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 
97  AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT, AV_ONCE_INIT
98 };
99 #endif
100 
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
109 #endif
110 #endif
111 }
112 
113 #endif /* AVCODEC_SINEWIN_TABLEGEN_H */
#define NULL
Definition: coverity.c:32
#define SINETABLE_CONST
Definition: sinewin.h:30
#define FF_ARRAY_ELEMS(a)
Macro definitions for various function/variable attributes.
#define av_cold
Definition: attributes.h:88
#define AVOnce
Definition: thread.h:172
#define INIT_FF_SINE_WINDOW_INIT_FUNC(index)
SINETABLE(32)
static SDL_Window * window
Definition: ffplay.c:366
av_cold void ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
#define sinf(x)
Definition: libm.h:419
#define AV_ONCE_INIT
Definition: thread.h:173
static AVOnce init_sine_window_once[9]
int index
Definition: gxfenc.c:89
SINETABLE_CONST float *const ff_sine_windows[]
common internal and external API header
static void(*const sine_window_init_func_array[])(void)
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:175
av_cold void ff_sine_window_init(float *window, int n)
Generate a sine window.
#define M_PI
Definition: mathematics.h:52
int i
Definition: input.c:407