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64 lines
1.4 KiB
64 lines
1.4 KiB
/*
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* ao_example.c
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* Written by Stan Seibert - July 2001
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*
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* Compilation command line (for Linux systems):
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* gcc -o ao_example ao_example.c -lao -ldl -lm
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*/
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#include <stdio.h>
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#include <string.h>
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#include <ao/ao.h>
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#include <math.h>
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#define BUF_SIZE 4096
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int main(int argc, char **argv)
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{
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ao_device *device;
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ao_sample_format format;
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int default_driver;
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char *buffer;
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int buf_size;
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int sample;
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float freq = 440.0;
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int i;
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/* -- Initialize -- */
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fprintf(stderr, "libao example program\n");
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ao_initialize();
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/* -- Setup for default driver -- */
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default_driver = ao_default_driver_id();
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memset(&format, 0, sizeof(format));
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format.bits = 16;
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format.channels = 2;
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format.rate = 44100;
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format.byte_format = AO_FMT_LITTLE;
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/* -- Open driver -- */
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device = ao_open_live(default_driver, &format, NULL);
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if (device == NULL) {
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fprintf(stderr, "Error opening device.\n");
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return 1;
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}
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/* -- Play some stuff -- */
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buf_size = format.bits/8 * format.channels * format.rate;
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buffer = calloc(buf_size, sizeof(char));
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for (i = 0; i < format.rate; i++) {
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sample = (int)(0.75 * 32768.0 *
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sin(2 * M_PI * freq * ((float) i/format.rate)));
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/* Put the same stuff in left and right channel */
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buffer[4*i] = buffer[4*i+2] = sample & 0xff;
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buffer[4*i+1] = buffer[4*i+3] = (sample >> 8) & 0xff;
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}
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ao_play(device, buffer, buf_size);
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/* -- Close and shutdown -- */
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ao_close(device);
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ao_shutdown();
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return (0);
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}
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