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 SINETABLE( 32);
35 SINETABLE( 64);
36 SINETABLE( 128);
37 SINETABLE( 256);
38 SINETABLE( 512);
39 SINETABLE(1024);
40 SINETABLE(2048);
41 SINETABLE(4096);
42 SINETABLE(8192);
43 #else
44 #include "libavcodec/sinewin_tables.h"
45 #endif
46 
47 SINETABLE_CONST float * const ff_sine_windows[] = {
48  NULL, NULL, NULL, NULL, NULL, // unused
49  ff_sine_32 , ff_sine_64 ,
50  ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096, ff_sine_8192
51 };
52 
53 // Generate a sine window.
54 av_cold void ff_sine_window_init(float *window, int n) {
55  int i;
56  for(i = 0; i < n; i++)
57  window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
58 }
59 
61  assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
62 #if !CONFIG_HARDCODED_TABLES
63  ff_sine_window_init(ff_sine_windows[index], 1 << index);
64 #endif
65 }
66 
67 #endif /* AVCODEC_SINEWIN_TABLEGEN_H */
#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:78
overlapping window(triangular window to avoid too much overlapping) ovidx
SINETABLE(32)
av_cold void ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows
NULL
Definition: eval.c:55
#define sinf(x)
Definition: libm.h:137
int index
Definition: gxfenc.c:89
synthesis window for stochastic i
SINETABLE_CONST float *const ff_sine_windows[]
common internal and external API header
av_cold void ff_sine_window_init(float *window, int n)
Generate a sine window.
#define M_PI
Definition: mathematics.h:46