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authorJedidiah Barber <contact@jedbarber.id.au>2023-06-19 22:15:44 +1200
committerJedidiah Barber <contact@jedbarber.id.au>2023-06-19 22:15:44 +1200
commit74af58587359206ef92249d18e4830c40cac0bc5 (patch)
tree8dfae06813f8e9f41787e45e7e31354b017f5713 /example/ao_example.c
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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()
+{
+ 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 /* 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 = 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);
+}