2 * Header file for hardcoded sine windows
4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
6 * This file is part of FFmpeg.
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.
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.
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
23 #ifndef AVCODEC_SINEWIN_TABLEGEN_H
24 #define AVCODEC_SINEWIN_TABLEGEN_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
30 #include "libavutil/attributes.h"
31 #include "libavutil/common.h"
33 #if !CONFIG_HARDCODED_TABLES
45 #include "libavcodec/sinewin_fixed_tables.h"
47 #include "libavcodec/sinewin_tables.h"
52 #define SINEWIN_SUFFIX(a) a ## _fixed
54 #define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
56 #define SINEWIN_SUFFIX(a) a
57 #define INTFLOAT float
61 SINETABLE_CONST INTFLOAT * const SINEWIN_SUFFIX(ff_sine_windows)[] = {
62 NULL, NULL, NULL, NULL, NULL, // unused
63 SINEWIN_SUFFIX(ff_sine_32) , SINEWIN_SUFFIX(ff_sine_64), SINEWIN_SUFFIX(ff_sine_128),
64 SINEWIN_SUFFIX(ff_sine_256), SINEWIN_SUFFIX(ff_sine_512), SINEWIN_SUFFIX(ff_sine_1024),
65 SINEWIN_SUFFIX(ff_sine_2048), SINEWIN_SUFFIX(ff_sine_4096), SINEWIN_SUFFIX(ff_sine_8192)
68 // Generate a sine window.
69 av_cold void SINEWIN_SUFFIX(ff_sine_window_init)(INTFLOAT *window, int n) {
71 for(i = 0; i < n; i++)
72 window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
75 av_cold void SINEWIN_SUFFIX(ff_init_ff_sine_windows)(int index) {
76 assert(index >= 0 && index < FF_ARRAY_ELEMS(SINEWIN_SUFFIX(ff_sine_windows)));
77 #if !CONFIG_HARDCODED_TABLES
78 SINEWIN_SUFFIX(ff_sine_window_init)(SINEWIN_SUFFIX(ff_sine_windows)[index], 1 << index);
82 #endif /* AVCODEC_SINEWIN_TABLEGEN_H */