2 * Generate a header file for hardcoded ff_cos_* 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
28 #define M_PI 3.14159265358979323846
31 #define FLOATFMT "%.18e"
33 int main(int argc, char *argv[])
36 int do_sin = argc == 2 && !strcmp(argv[1], "sin");
37 double (*func)(double) = do_sin ? sin : cos;
39 printf("/* This file was generated by libavcodec/costablegen */\n");
40 printf("#include \"libavcodec/fft.h\"\n");
41 for (i = 4; i <= BITS; i++) {
43 double freq = 2*M_PI/m;
44 printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m);
45 for (j = 0; j < m/2 - 1; j++) {
46 int idx = j > m/4 ? m/2 - j : j;
47 if (do_sin && j >= m/4)
49 printf(" "FLOATFMT",", func(idx*freq));
53 printf(" "FLOATFMT"\n};\n", func(do_sin ? -(m/4 - 1)*freq : freq));