yading@10: /*
yading@10:  * Generate a header file for hardcoded ff_cos_* tables
yading@10:  *
yading@10:  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <string.h>
yading@10: #include <math.h>
yading@10: 
yading@10: #define BITS 16
yading@10: #define FLOATFMT "%.18e"
yading@10: #define FIXEDFMT "%6d"
yading@10: 
yading@10: static int clip_f15(int v)
yading@10: {
yading@10:     return v < -32767 ? -32767 :
yading@10:            v >  32767 ?  32767 :
yading@10:            v;
yading@10: }
yading@10: 
yading@10: static void printval(double val, int fixed)
yading@10: {
yading@10:     if (fixed)
yading@10:         printf(" "FIXEDFMT",", clip_f15(lrint(val * (double)(1<<15))));
yading@10:     else
yading@10:         printf(" "FLOATFMT",", val);
yading@10: 
yading@10: }
yading@10: 
yading@10: int main(int argc, char *argv[])
yading@10: {
yading@10:     int i, j;
yading@10:     int do_sin = argc > 1 && !strcmp(argv[1], "sin");
yading@10:     int fixed  = argc > 1 &&  strstr(argv[1], "fixed");
yading@10:     double (*func)(double) = do_sin ? sin : cos;
yading@10: 
yading@10:     printf("/* This file was automatically generated. */\n");
yading@10:     printf("#define CONFIG_FFT_FLOAT %d\n", !fixed);
yading@10:     printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h");
yading@10:     for (i = 4; i <= BITS; i++) {
yading@10:         int m = 1 << i;
yading@10:         double freq = 2*3.14159265358979323846/m;
yading@10:         printf("%s(%i) = {\n   ", do_sin ? "SINTABLE" : "COSTABLE", m);
yading@10:         for (j = 0; j < m/2 - 1; j++) {
yading@10:             int idx = j > m/4 ? m/2 - j : j;
yading@10:             if (do_sin && j >= m/4)
yading@10:                 idx = m/4 - j;
yading@10:             printval(func(idx*freq), fixed);
yading@10:             if ((j & 3) == 3)
yading@10:                 printf("\n   ");
yading@10:         }
yading@10:         printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed);
yading@10:         printf("\n};\n");
yading@10:     }
yading@10:     return 0;
yading@10: }