1/* 2 * Generate a header file for hardcoded ff_cos_* tables 3 * 4 * Copyright (c) 2009 Reimar D��ffinger <Reimar.Doeffinger@gmx.de> 5 * 6 * This file is part of FFmpeg. 7 * 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. 12 * 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. 17 * 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 21 */ 22 23#include <stdio.h> 24#include <string.h> 25#include <math.h> 26 27#ifndef M_PI 28#define M_PI 3.14159265358979323846 29#endif 30#define BITS 16 31#define FLOATFMT "%.18e" 32 33int main(int argc, char *argv[]) 34{ 35 int i, j; 36 int do_sin = argc == 2 && !strcmp(argv[1], "sin"); 37 double (*func)(double) = do_sin ? sin : cos; 38 39 printf("/* This file was generated by libavcodec/costablegen */\n"); 40 printf("#include \"libavcodec/fft.h\"\n"); 41 for (i = 4; i <= BITS; i++) { 42 int m = 1 << 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) 48 idx = m/4 - j; 49 printf(" "FLOATFMT",", func(idx*freq)); 50 if ((j & 3) == 3) 51 printf("\n "); 52 } 53 printf(" "FLOATFMT"\n};\n", func(do_sin ? -(m/4 - 1)*freq : freq)); 54 } 55 return 0; 56} 57