TetaTricks/code/ao_example.c

/*
 * ao_example.c
 *     Written by Stan Seibert - July 2001
 *
 * Compilation command line (for Linux systems):
 *     gcc -o ao_example ao_example.c -lao -ldl -lm
 */

#include <stdio.h>
#include <string.h>
#include <ao/ao.h>
#include <math.h>

#define BUF_SIZE 4096

int main(int argc, char **argv)
{
ao_device *device;
ao_sample_format format;
int default_driver;
char *buffer;
int buf_size;
int sample;
float freq = 440.0;
int i;

	/* -- Initialize -- */
fprintf(stderr, "libao example program\n");
ao_initialize();

	/* -- Setup for default driver -- */
default_driver = ao_default_driver_id();
memset(&format, 0, sizeof(format));
format.bits = 16;
format.channels = 2;
format.rate = 44100;
format.byte_format = AO_FMT_LITTLE;

	/* -- Open driver -- */
device = ao_open_live(default_driver, &format, NULL);
if (device == NULL) {
	fprintf(stderr, "Error opening device.\n");
	return 1;
}

	/* -- Play some stuff -- */
buf_size = format.bits/8 * format.channels * format.rate;
buffer = calloc(buf_size, sizeof(char));

for (i = 0; i < format.rate; i++) {
	sample = (int)(0.75 * 32768.0 *
	      sin(2 * M_PI * freq * ((float) i/format.rate)));
	/* Put the same stuff in left and right channel */
	buffer[4*i] = buffer[4*i+2] = sample & 0xff;
	buffer[4*i+1] = buffer[4*i+3] = (sample >> 8) & 0xff;
	}
ao_play(device, buffer, buf_size);

/* -- Close and shutdown -- */
ao_close(device);
ao_shutdown();

return (0);
}