2 * Header file for hardcoded sine windows
4 * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
6 * This file is part of Libav.
8 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 // do not use libavutil/libm.h since this is compiled both
25 // for the host and the target and config.h is only valid for the target
27 #include "libavutil/attributes.h"
29 #if !CONFIG_HARDCODED_TABLES
39 #include "libavcodec/sinewin_tables.h"
42 SINETABLE_CONST
float * const ff_sine_windows
[] = {
43 NULL
, NULL
, NULL
, NULL
, NULL
, // unused
44 ff_sine_32
, ff_sine_64
,
45 ff_sine_128
, ff_sine_256
, ff_sine_512
, ff_sine_1024
, ff_sine_2048
, ff_sine_4096
48 // Generate a sine window.
49 av_cold
void ff_sine_window_init(float *window
, int n
) {
51 for(i
= 0; i
< n
; i
++)
52 window
[i
] = sinf((i
+ 0.5) * (M_PI
/ (2.0 * n
)));
55 av_cold
void ff_init_ff_sine_windows(int index
) {
56 assert(index
>= 0 && index
< FF_ARRAY_ELEMS(ff_sine_windows
));
57 #if !CONFIG_HARDCODED_TABLES
58 ff_sine_window_init(ff_sine_windows
[index
], 1 << index
);