wav_generator.cpp

来自「正弦波形生成器」· C++ 代码 · 共 45 行

// wav_generator.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdio.h"
#include "math.h"

#define total_len (1*60*44100)
short buf[total_len];
const double pi = 3.1415926535897932384626433832795;


int main(int argc, char* argv[])
{
	int i, n;
	double j;
	FILE *file;

	j = 0;
	for(i=0; i<(total_len); i++) {
		int tmp;
		double f;

		f = sin(j)*12000.0;
		buf[i] = (short)f;

		f = i;
		f /= (total_len/10.0);
		f = pow(2.0, f);
		f *= 20.0;  // f is now current frequence
		f *= pi * 2;
		f /= (44100.0);
		j += f;
		if ( j>(pi*2) )
			j -= (pi*2);
	}

	file = fopen("c:\\test.wav", "wb");
	fwrite(buf, 2, total_len, file);
	fclose(file);

	return 0;
}