AO test file

This commit is contained in:
Brad Grantham 2017-01-03 10:09:18 -08:00
parent 30ec998252
commit c981363b4d

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testao.cpp Normal file
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/*
*
* ao_example.c
*
* Written by Stan Seibert - July 2001
*
* Legal Terms:
*
* This source file is released into the public domain. It is
* distributed without any warranty; without even the implied
* warranty * of merchantability or fitness for a particular
* purpose.
*
* Function:
*
* This program opens the default driver and plays a 440 Hz tone for
* one second.
*
* 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 = 8;
format.channels = 1;
format.rate = 44100;
format.byte_format = AO_FMT_LITTLE;
/* -- Open driver -- */
device = ao_open_live(default_driver, &format, NULL /* no options */);
if (device == NULL) {
fprintf(stderr, "Error opening device.\n");
return 1;
}
/* -- Play some stuff -- */
buf_size = format.bits/8 * format.channels * format.rate;
buffer = (char*)calloc(buf_size,
sizeof(char));
for (i = 0; i < format.rate; i++) {
sample = 128 - (int)(0.75 * 128.0 *
sin(2 * M_PI * freq * ((float) i/format.rate)));
/* Put the same stuff in left and right channel */
buffer[i] = sample;
printf("%d\n", sample);
}
ao_play(device, buffer, buf_size);
/* -- Close and shutdown -- */
ao_close(device);
ao_shutdown();
return (0);
}