AO test file

testao.cpp

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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);
+}