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sine example: add parameter to specify device

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This commit is contained in:
Andrew Kelley 2015-08-20 17:38:01 -07:00
parent bc7b22f61c
commit 2eb8ce24cf
2 changed files with 63 additions and 22 deletions
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3
README.md
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@ -69,9 +69,6 @@ backend:
#include <string.h> #include <string.h>
#include <math.h> #include <math.h>
__attribute__ ((cold))
__attribute__ ((noreturn))
__attribute__ ((format (printf, 1, 2)))
static void panic(const char *format, ...) { static void panic(const char *format, ...) {
va_list ap; va_list ap;
va_start(ap, format); va_start(ap, format);

82
example/sio_sine.c
View file

@ -23,8 +23,9 @@ static void panic(const char *format, ...) {
} }
static int usage(char *exe) { static int usage(char *exe) {
fprintf(stderr, "Usage: %s [--dummy] [--alsa] [--pulseaudio] [--jack]\n", exe); fprintf(stderr, "Usage: %s [--backend dummy|alsa|pulseaudio|jack|coreaudio|wasapi] [--device id] [--raw]\n",
return 1; exe);
return EXIT_FAILURE;
} }
static const float PI = 3.1415926535f; static const float PI = 3.1415926535f;
@ -78,16 +79,40 @@ static void underflow_callback(struct SoundIoOutStream *outstream) {
int main(int argc, char **argv) { int main(int argc, char **argv) {
char *exe = argv[0]; char *exe = argv[0];
enum SoundIoBackend backend = SoundIoBackendNone; enum SoundIoBackend backend = SoundIoBackendNone;
char *device_id = NULL;
bool raw = false;
for (int i = 1; i < argc; i += 1) { for (int i = 1; i < argc; i += 1) {
char *arg = argv[i]; char *arg = argv[i];
if (strcmp("--dummy", arg) == 0) { if (arg[0] == '-' && arg[1] == '-') {
backend = SoundIoBackendDummy; if (strcmp(arg, "--raw") == 0) {
} else if (strcmp("--alsa", arg) == 0) { raw = true;
backend = SoundIoBackendAlsa; } else {
} else if (strcmp("--pulseaudio", arg) == 0) { i += 1;
backend = SoundIoBackendPulseAudio; if (i >= argc) {
} else if (strcmp("--jack", arg) == 0) { return usage(exe);
backend = SoundIoBackendJack; } else if (strcmp(arg, "--backend") == 0) {
if (strcmp(argv[i], "dummy") == 0) {
backend = SoundIoBackendDummy;
} else if (strcmp(argv[i], "alsa") == 0) {
backend = SoundIoBackendAlsa;
} else if (strcmp(argv[i], "pulseaudio") == 0) {
backend = SoundIoBackendPulseAudio;
} else if (strcmp(argv[i], "jack") == 0) {
backend = SoundIoBackendJack;
} else if (strcmp(argv[i], "coreaudio") == 0) {
backend = SoundIoBackendCoreAudio;
} else if (strcmp(argv[i], "wasapi") == 0) {
backend = SoundIoBackendWasapi;
} else {
fprintf(stderr, "Invalid backend: %s\n", argv[i]);
return EXIT_FAILURE;
}
} else if (strcmp(arg, "--device") == 0) {
device_id = argv[i];
} else {
return usage(exe);
}
}
} else { } else {
return usage(exe); return usage(exe);
} }
@ -100,16 +125,33 @@ int main(int argc, char **argv) {
int err = (backend == SoundIoBackendNone) ? int err = (backend == SoundIoBackendNone) ?
soundio_connect(soundio) : soundio_connect_backend(soundio, backend); soundio_connect(soundio) : soundio_connect_backend(soundio, backend);
if (err) if (err) {
panic("error connecting: %s", soundio_strerror(err)); fprintf(stderr, "Unable to connect to backend: %s\n", soundio_strerror(err));
return EXIT_FAILURE;
}
soundio_flush_events(soundio); soundio_flush_events(soundio);
int default_out_device_index = soundio_default_output_device_index(soundio); int selected_device_index = -1;
if (default_out_device_index < 0) if (device_id) {
panic("no output device found"); int device_count = soundio_output_device_count(soundio);
for (int i = 0; i < device_count; i += 1) {
struct SoundIoDevice *device = soundio_get_output_device(soundio, i);
if (strcmp(device->id, device_id) == 0 && device->is_raw == raw) {
selected_device_index = i;
break;
}
}
} else {
selected_device_index = soundio_default_output_device_index(soundio);
}
struct SoundIoDevice *device = soundio_get_output_device(soundio, default_out_device_index); if (selected_device_index < 0) {
fprintf(stderr, "Output device not found\n");
return EXIT_SUCCESS;
}
struct SoundIoDevice *device = soundio_get_output_device(soundio, selected_device_index);
if (!device) if (!device)
panic("out of memory"); panic("out of memory");
@ -120,8 +162,10 @@ int main(int argc, char **argv) {
outstream->write_callback = write_callback; outstream->write_callback = write_callback;
outstream->underflow_callback = underflow_callback; outstream->underflow_callback = underflow_callback;
if ((err = soundio_outstream_open(outstream))) if ((err = soundio_outstream_open(outstream))) {
panic("unable to open device: %s", soundio_strerror(err)); fprintf(stderr, "unable to open device: %s", soundio_strerror(err));
return EXIT_FAILURE;
}
if (outstream->layout_error) if (outstream->layout_error)
fprintf(stderr, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error)); fprintf(stderr, "unable to set channel layout: %s\n", soundio_strerror(outstream->layout_error));
@ -135,5 +179,5 @@ int main(int argc, char **argv) {
soundio_outstream_destroy(outstream); soundio_outstream_destroy(outstream);
soundio_device_unref(device); soundio_device_unref(device);
soundio_destroy(soundio); soundio_destroy(soundio);
return 0; return EXIT_SUCCESS;
} }