Sine wave: Difference between revisions

=={{header|C}}==

{{trans|Python}}

<lang c>#include <stdio.h>

#include <math.h>

#include <stdlib.h>

// AU header (CD-quality audio)

int header[] = {46, 115, 110, 100, 0, 0, 0, 24,

255, 255, 255, 255, 0, 0, 0, 3,

0, 0, 172, 68, 0, 0, 0, 1};

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

float freq, dur;

long i, v;

if (argc < 2) {

printf("Usage:\n");

printf(" csine <frequency> <duration>\n");

exit(1);

}

freq = atof(argv[1]);

dur = atof(argv[2]);

for (i = 0; i < 24; i++)

putchar(header[i]);

for (i = 0; i < dur * 44100; i++) {

v = (long) round(32000. * sin(2. * M_PI * freq * i / 44100.));

v = v % 65536;

putchar(v >> 8);

putchar(v % 256);

}

}</lang>

Test:

<pre>

gcc -o csine csine.c -lm

./csine 440 5 | play - # Now either pipe output into SoX to play

./csine 440 5 > test.au # or redirect output to a file.

</pre>