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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pulse/pulseaudio.h>
//TODO pa_operation_unref(o);
static int default_sink_index;
static void sink_info_volume_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
pa_volume_t vol;
if (eol) return;
vol = pa_cvolume_avg(&i->volume);
printf("v%d,%d,%.02f,%d\n", i->index, vol*100/PA_VOLUME_NORM, pa_sw_volume_to_dB(vol), i->mute);
fflush(stdout);
}
static void sink_info_default_index_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
if (eol) return;
default_sink_index = i->index;
}
static void sink_info_sink_desc_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
if (eol) return;
printf("s%d,%s,%s\n", i->index, i->name, i->description);
fflush(stdout);
}
static void server_info_default_sink_callback(pa_context *c, const pa_server_info *i, void *userdata) {
pa_context_get_sink_info_by_name(c, i->default_sink_name, sink_info_default_index_callback, userdata);
printf("f%d\n", default_sink_index);
fflush(stdout);
}
static void subscription_callback(pa_context *c, pa_subscription_event_type_t t, uint32_t idx, void *userdata) {
switch (t & PA_SUBSCRIPTION_EVENT_FACILITY_MASK) {
case PA_SUBSCRIPTION_EVENT_SINK:
// check if sink was removed
if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_REMOVE) {
printf("x%d\n", idx);
fflush(stdout);
return;
}
// check if sink was added
if ((t & PA_SUBSCRIPTION_EVENT_TYPE_MASK) == PA_SUBSCRIPTION_EVENT_NEW)
pa_context_get_sink_info_by_index(c, idx, sink_info_sink_desc_callback, userdata);
// output the volume
pa_context_get_sink_info_by_index(c, idx, sink_info_volume_callback, userdata);
break;
case PA_SUBSCRIPTION_EVENT_SERVER:
pa_context_get_server_info(c, server_info_default_sink_callback, userdata);
break;
}
}
static void context_state_callback(pa_context *c, void *userdata) {
if (pa_context_get_state(c) == PA_CONTEXT_READY) {
pa_context_set_subscribe_callback(c, subscription_callback, userdata);
// output initial default sink
pa_context_get_server_info(c, server_info_default_sink_callback, userdata);
// output initial sink descriptions for each sink
pa_context_get_sink_info_list(c, sink_info_sink_desc_callback, userdata);
// output initial volume levels for each sink
pa_context_get_sink_info_list(c, sink_info_volume_callback, userdata);
// subscribe to sink & server events to listen to changes
pa_context_subscribe(c, PA_SUBSCRIPTION_MASK_SINK|PA_SUBSCRIPTION_MASK_SERVER, NULL, NULL);
}
}
int main() {
pa_threaded_mainloop *mainloop = pa_threaded_mainloop_new();
pa_mainloop_api *mainloop_api = pa_threaded_mainloop_get_api(mainloop);
pa_context *context = pa_context_new(mainloop_api, "pavolctrld");
char stdin_buffer[256];
pa_context_connect(context, NULL, PA_CONTEXT_NOAUTOSPAWN, NULL);
pa_context_set_state_callback(context, context_state_callback, NULL);
// main loop
pa_threaded_mainloop_start(mainloop);
while(1) {
if (fgets(stdin_buffer, sizeof(stdin_buffer), stdin) != NULL) {
printf("You entered: %s", stdin_buffer);
fflush(stdout);
}
}
// clean up
pa_context_disconnect(context);
pa_context_unref(context);
pa_threaded_mainloop_free(mainloop);
return 0;
}
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