57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
/*
|
|
* Generate a header file for hardcoded ff_cos_* tables
|
|
*
|
|
* Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#ifndef M_PI
|
|
#define M_PI 3.14159265358979323846
|
|
#endif
|
|
#define BITS 16
|
|
#define FLOATFMT "%.18e"
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int i, j;
|
|
int do_sin = argc == 2 && !strcmp(argv[1], "sin");
|
|
double (*func)(double) = do_sin ? sin : cos;
|
|
|
|
printf("/* This file was generated by libavcodec/costablegen */\n");
|
|
printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h");
|
|
for (i = 4; i <= BITS; i++) {
|
|
int m = 1 << i;
|
|
double freq = 2*M_PI/m;
|
|
printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m);
|
|
for (j = 0; j < m/2 - 1; j++) {
|
|
int idx = j > m/4 ? m/2 - j : j;
|
|
if (do_sin && j >= m/4)
|
|
idx = m/4 - j;
|
|
printf(" "FLOATFMT",", func(idx*freq));
|
|
if ((j & 3) == 3)
|
|
printf("\n ");
|
|
}
|
|
printf(" "FLOATFMT"\n};\n", func(do_sin ? -(m/4 - 1)*freq : freq));
|
|
}
|
|
return 0;
|
|
}
|