/*
  * 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>
 
 #define BITS 16
 #define FLOATFMT "%.18e"

 #define FIXEDFMT "%6d"
 
 static int clip_f15(int v)
 {
     return v < -32767 ? -32767 :
            v >  32767 ?  32767 :
            v;
 }
 
 static void printval(double val, int fixed)
 {
     if (fixed)
         printf(" "FIXEDFMT",", clip_f15(lrint(val * (double)(1<<15))));
     else
         printf(" "FLOATFMT",", val);
 
 }

 int main(int argc, char *argv[])

 {
     int i, j;

     int do_sin = argc > 1 && !strcmp(argv[1], "sin");

     int fixed  = argc > 1 &&  strstr(argv[1], "fixed");

     double (*func)(double) = do_sin ? sin : cos;
 

     printf("/* This file was automatically generated. */\n");

     printf("#define CONFIG_FFT_FLOAT %d\n", !fixed);

     printf("#include \"libavcodec/%s\"\n", do_sin ? "rdft.h" : "fft.h");

     for (i = 4; i <= BITS; i++) {
         int m = 1 << i;

         double freq = 2*3.14159265358979323846/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;

             printval(func(idx*freq), fixed);

             if ((j & 3) == 3)
                 printf("\n   ");
         }

         printval(func(do_sin ? -(m/4 - 1)*freq : freq), fixed);
         printf("\n};\n");

     }
     return 0;
 }