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_FIXED_TABLEGEN_H
24 #define AVCODEC_SINEWIN_FIXED_TABLEGEN_H
27 #undef DECLARE_ALIGNED
28 #define DECLARE_ALIGNED(align, type, name) type name
30 #include "libavutil/mem_internal.h"
33 #define SINETABLE(size) \
34 static SINETABLE_CONST DECLARE_ALIGNED(32, int, sine_##size##_fixed)[size]
36 #if CONFIG_HARDCODED_TABLES
37 #define init_sine_windows_fixed()
38 #define SINETABLE_CONST const
39 #include "libavcodec/sinewin_fixed_tables.h"
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
44 #include "libavutil/attributes.h"
46 #define SINETABLE_CONST
51 #define SIN_FIX(a) (int)floor((a) * 0x80000000 + 0.5)
53 // Generate a sine window.
54 static av_cold void sine_window_init_fixed(int *window, int n)
56 for (int i = 0; i < n; i++)
57 window[i] = SIN_FIX(sinf((i + 0.5) * (M_PI / (2.0 * n))));
60 static av_cold void init_sine_windows_fixed(void)
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);
66 #endif /* CONFIG_HARDCODED_TABLES */
67 #endif /* AVCODEC_SINEWIN_FIXED_TABLEGEN_H */