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 Libav. 7 * 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. 12 * 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. 17 * 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 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#define FIXEDFMT "%6d" 33 34static int clip_f15(int v) 35{ 36 return v < -32767 ? -32767 : 37 v > 32767 ? 32767 : 38 v; 39} 40 41static void printval(double val, int fixed) 42{ 43 if (fixed) 44 printf(" "FIXEDFMT",", clip_f15(lrint(val * (double)(1<<15)))); 45 else 46 printf(" "FLOATFMT",", val); 47 48} 49 50int main(int argc, char *argv[]) 51{ 52 int i, j; 53 int do_sin = argc > 1 && !strcmp(argv[1], "sin"); 54 int fixed = argc > 1 && strstr(argv[1], "fixed"); 55 double (*func)(double) = do_sin ? sin : cos; 56 57 printf("/* This file was automatically generated. */\n"); 58 printf("#define CONFIG_FFT_FLOAT %d\n", !fixed); 59 printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h"); 60 for (i = 4; i <= BITS; i++) { 61 int m = 1 << i; 62 double freq = 2*M_PI/m; 63 printf("%s(%i) = {\n ", do_sin ? "SINTABLE" : "COSTABLE", m); 64 for (j = 0; j < m/2 - 1; j++) { 65 int idx = j > m/4 ? m/2 - j : j; 66 if (do_sin && j >= m/4) 67 idx = m/4 - j; 68 printval(func(idx*freq), fixed); 69 if ((j & 3) == 3) 70 printf("\n "); 71 } 72 printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed); 73 printf("\n};\n"); 74 } 75 return 0; 76} 77