2 * Header file for hardcoded MDCT tables
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
24 // do not use libavutil/mathematics.h since this is compiled both
25 // for the host and the target and config.h is only valid for the target
28 #if !CONFIG_HARDCODED_TABLES
38 #include "libavcodec/mdct_tables.h"
41 SINETABLE_CONST float * const ff_sine_windows[] = {
42 NULL, NULL, NULL, NULL, NULL, // unused
43 ff_sine_32 , ff_sine_64 ,
44 ff_sine_128, ff_sine_256, ff_sine_512, ff_sine_1024, ff_sine_2048, ff_sine_4096
47 // Generate a sine window.
48 av_cold void ff_sine_window_init(float *window, int n) {
50 for(i = 0; i < n; i++)
51 window[i] = sinf((i + 0.5) * (M_PI / (2.0 * n)));
54 av_cold void ff_init_ff_sine_windows(int index) {
55 assert(index >= 0 && index < FF_ARRAY_ELEMS(ff_sine_windows));
56 #if !CONFIG_HARDCODED_TABLES
57 ff_sine_window_init(ff_sine_windows[index], 1 << index);