fmfreqs.c

gameboy游戏模拟器,COMMON.H CONV.C DASM.C DEBUG.C FILE_ID.DIZ FMFREQS.C FMFREQS.H GB.C GB.H GBLIST.C HEL

/* FmFreqs.c
   This file is part of the VGB-DOS project
   Copyright (C) Marcel de Kogel ([e-mail]),  1996
    Markus F.X.J. Oberhumer ([e-mail]), 1996
   You may not use this file for commercial purposes
   Please notify me if you make any changes to this file */

#include <stdio.h>
#include <math.h>

int main (void)
{
	int i;
	int b, bestb;
	double v, minv;
        int f, bestf;
	double realfreq, adlibfreq;
	FILE *file;

	file = stdout;
	for (i = 2048; i >= 1; i--)
	{
		minv = 10000; bestb = 0; bestf = 0;
		realfreq = 4194304.0 / (32*i);
		for (b = 0; b < 8; b++)
		{
                        f = floor (realfreq / (50000.0 * pow(2,b-20)) + 0.5);
			if (f > 1023)
				continue;
			adlibfreq = 50000.0 * f * pow(2,b-20);
			v = fabs(realfreq - adlibfreq);
			if (v < minv)
			{
				minv = v;
				bestb = b;
				bestf = f;
			}
		}
                fprintf(file,"%1d, %4d,     /* %8.2f */\n",
                        bestb, bestf, minv);
	}
	
	return 0;
}