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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <pulse/pulseaudio.h>
static pa_mainloop *mainloop = NULL;
static pa_context *context = NULL;
static int list_mode = 0;
static int toggle_mode = 0;
static pa_sink_info **sinks = NULL;
static unsigned int sink_count = 0;
static unsigned int current_sink_index = 0;
void server_info_callback(pa_context *c, const pa_server_info *i, void *userdata);
void set_default_sink_callback(pa_context *c, int success, void *userdata);
int get_output_type(const char *input, char *output, size_t output_size) {
if (!input || !output || output_size == 0) return -1;
const char *last_dot = strrchr(input, '.');
if (!last_dot) return -1;
last_dot++;
const char *hyphen = strchr(last_dot, '-');
size_t len = hyphen ? (size_t)(hyphen - last_dot) : strlen(last_dot);
if (len >= output_size) len = output_size - 1;
strncpy(output, last_dot, len);
output[len] = '\0';
return 0;
}
void sink_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
(void)userdata;
if (eol > 0) {
if (list_mode) {
pa_mainloop_quit(mainloop, 0);
} else if (toggle_mode) {
pa_operation_unref(pa_context_get_server_info(c, server_info_callback, NULL));
}
return;
}
if (list_mode) {
int is_active = 0;
if (i->state == PA_SINK_RUNNING) {
is_active = 1;
}
char output_type[64];
if (get_output_type(i->name, output_type, sizeof(output_type)) == 0) {
printf(" %s%s", output_type, is_active ? "*" : "");
}
} else if (toggle_mode) {
sinks = realloc(sinks, (sink_count + 1) * sizeof(pa_sink_info*));
sinks[sink_count] = malloc(sizeof(pa_sink_info));
memcpy(sinks[sink_count], i, sizeof(pa_sink_info));
if (i->name) {
size_t name_len = strlen(i->name) + 1;
char *name_copy = malloc(name_len);
strcpy(name_copy, i->name);
sinks[sink_count]->name = name_copy;
}
if (i->description) {
size_t desc_len = strlen(i->description) + 1;
char *desc_copy = malloc(desc_len);
strcpy(desc_copy, i->description);
sinks[sink_count]->description = desc_copy;
}
sink_count++;
}
}
void set_default_sink_callback(pa_context *c, int success, void *userdata) {
(void)userdata;
if (success) {
printf("Successfully switched default sink\n");
} else {
int error = pa_context_errno(c);
fprintf(stderr, "Failed to switch default sink: %s (error code: %d)\n", pa_strerror(error), error);
}
pa_mainloop_quit(mainloop, success ? 0 : 1);
}
void server_info_callback(pa_context *c, const pa_server_info *i, void *userdata) {
(void)userdata;
if (!i) {
pa_mainloop_quit(mainloop, 1);
return;
}
// Find current default sink in our list.
for (unsigned int j = 0; j < sink_count; j++) {
if (strcmp(sinks[j]->name, i->default_sink_name) == 0) {
current_sink_index = j;
break;
}
}
// Switch to next sink.
unsigned int next_sink_index = (current_sink_index + 1) % sink_count;
printf("Switching from %s to %s\n",
sinks[current_sink_index]->description,
sinks[next_sink_index]->description);
// Set the new default sink with callback.
pa_operation_unref(pa_context_set_default_sink(c, sinks[next_sink_index]->name, set_default_sink_callback, NULL));
}
void state_callback(pa_context *c, void *userdata) {
(void)userdata;
switch (pa_context_get_state(c)) {
case PA_CONTEXT_READY:
if (list_mode) {
pa_operation_unref(pa_context_get_sink_info_list(c, sink_callback, NULL));
} else if (toggle_mode) {
pa_operation_unref(pa_context_get_sink_info_list(c, sink_callback, NULL));
}
break;
case PA_CONTEXT_FAILED:
case PA_CONTEXT_TERMINATED:
pa_mainloop_quit(mainloop, 1);
break;
default:
break;
}
}
void print_usage(const char *program_name) {
printf("Usage: %s [OPTIONS]\n", program_name);
printf("Options:\n");
printf(" -l, --list List all available audio sinks\n");
printf(" -t, --toggle Toggle between available audio sinks\n");
printf(" -h, --help Show this help message\n");
}
int main(int argc, char *argv[]) {
int opt;
const char *short_options = "lth";
struct option long_options[] = {
{"list", no_argument, 0, 'l'},
{"toggle", no_argument, 0, 't'},
{"help", no_argument, 0, 'h'},
{0, 0, 0, 0}
};
while ((opt = getopt_long(argc, argv, short_options, long_options, NULL)) != -1) {
switch (opt) {
case 'l':
list_mode = 1;
break;
case 't':
toggle_mode = 1;
break;
case 'h':
print_usage(argv[0]);
return 0;
default:
print_usage(argv[0]);
return 1;
}
}
if (!list_mode && !toggle_mode) {
fprintf(stderr, "Error: Please specify either -l (list) or -t (toggle) option\n");
print_usage(argv[0]);
return 1;
}
if (list_mode && toggle_mode) {
fprintf(stderr, "Error: Cannot use both -l and -t options simultaneously\n");
return 1;
}
mainloop = pa_mainloop_new();
context = pa_context_new(pa_mainloop_get_api(mainloop), "SinkLister");
if (pa_context_connect(context, NULL, PA_CONTEXT_NOFLAGS, NULL) < 0) {
fprintf(stderr, "Failed to connect to PulseAudio server: %s\n", pa_strerror(pa_context_errno(context)));
return 1;
}
pa_context_set_state_callback(context, state_callback, NULL);
int retval;
pa_mainloop_run(mainloop, &retval);
// Cleanup for toggle mode
if (toggle_mode && sinks) {
for (unsigned int i = 0; i < sink_count; i++) {
if (sinks[i]->name) {
free((void*)sinks[i]->name);
}
if (sinks[i]->description) {
free((void*)sinks[i]->description);
}
free(sinks[i]);
}
free(sinks);
}
pa_context_disconnect(context);
pa_context_unref(context);
pa_mainloop_free(mainloop);
return retval;
}
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