libsoundio/example/list_devices.c

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/*
* Copyright (c) 2015 Andrew Kelley
*
* This file is part of libsoundio, which is MIT licensed.
* See http://opensource.org/licenses/MIT
*/
#include <soundio.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
// list or keep a watch on audio devices
static int usage(char *exe) {
fprintf(stderr, "Usage: %s [--watch]\n", exe);
return 1;
}
static int list_devices(struct SoundIo *soundio) {
int output_count = soundio_get_output_device_count(soundio);
int input_count = soundio_get_input_device_count(soundio);
int default_output = soundio_get_default_output_device_index(soundio);
int default_input = soundio_get_default_input_device_index(soundio);
for (int i = 0; i < input_count; i += 1) {
struct SoundIoDevice *device = soundio_get_input_device(soundio, i);
const char *purpose_str = "input";
const char *default_str = (i == default_input) ? " (default)" : "";
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const char *description = soundio_device_description(device);
int sample_rate = soundio_device_sample_rate(device);
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fprintf(stderr, "%s device: %d Hz %s%s\n", purpose_str, sample_rate, description, default_str);
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soundio_device_unref(device);
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}
for (int i = 0; i < output_count; i += 1) {
struct SoundIoDevice *device = soundio_get_output_device(soundio, i);
const char *purpose_str = "output";
const char *default_str = (i == default_output) ? " (default)" : "";
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const char *description = soundio_device_description(device);
int sample_rate = soundio_device_sample_rate(device);
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fprintf(stderr, "%s device: %d Hz %s%s\n", purpose_str, sample_rate, description, default_str);
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soundio_device_unref(device);
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}
fprintf(stderr, "%d devices found\n", input_count + output_count);
return 0;
}
static void on_devices_change(struct SoundIo *soundio) {
fprintf(stderr, "devices changed\n");
list_devices(soundio);
}
int main(int argc, char **argv) {
char *exe = argv[0];
bool watch = false;
for (int i = 1; i < argc; i += 1) {
char *arg = argv[i];
if (strcmp("--watch", arg) == 0) {
watch = true;
} else {
return usage(exe);
}
}
int err;
struct SoundIo *soundio;
if ((err = soundio_create(&soundio))) {
fprintf(stderr, "%s\n", soundio_error_string(err));
return err;
}
if (watch) {
soundio->on_devices_change = on_devices_change;
for (;;) {
soundio_wait_events(soundio);
}
} else {
int err = list_devices(soundio);
soundio_destroy(soundio);
return err;
}
}