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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pulse/pulseaudio.h>
#define ROUND_POS(x) ((int)((x) + 0.5f))
//TODO pa_operation_unref(o);
/* context vars */
static int default_sink_index; // should always point to default sink
static int command_sink_index; // commands will modify this sink
/* output callbacks */
static void sink_info_volume_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
pa_volume_t vol = pa_cvolume_avg(&i->volume);
if (eol) return;
printf("v%d,%d,%.02f,%d\n", i->index, ROUND_POS(vol*100.0f/PA_VOLUME_NORM), pa_sw_volume_to_dB(vol), i->mute);
fflush(stdout);
}
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 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;
printf("f%d\n", default_sink_index);
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);
}
/* subscription callback is called whenever a listened-to event occurs */
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;
}
}
/* context state will really only change at startup or exit etc. */
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);
// set command sink equal to the default sink on startup
command_sink_index = default_sink_index;
// 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
// other events can be subscribed to if desired
pa_context_subscribe(c, PA_SUBSCRIPTION_MASK_SINK|PA_SUBSCRIPTION_MASK_SERVER, NULL, NULL);
}
}
/* stdin commands */
static void sink_info_set_volume_callback(pa_context *c, const pa_sink_info *i, int eol, void *userdata) {
char *cmd = (char *)userdata;
pa_cvolume *cvol = (pa_cvolume *)&i->volume; // disregard const qualifier, avoid warnings :)
pa_volume_t vol = (pa_volume_t)(atof(&cmd[1]) / 100 * PA_VOLUME_NORM); // sneaky substring, super safe
if (eol) return;
switch(cmd[1]) {
case '\n': pa_context_get_sink_info_by_index(c, i->index, sink_info_volume_callback, userdata); return;
case '+': cvol = pa_cvolume_inc(cvol, vol); break;
case '-': cvol = pa_cvolume_dec(cvol, vol * -1); break; // should be no underflow w/ uint32 since 0dB is only 2^16
default : cvol = pa_cvolume_set(cvol, i->volume.channels, vol); break;
}
pa_context_set_sink_volume_by_index(c, i->index, cvol, NULL, NULL);
}
/* handle stdin commands */
static void handle_command(pa_context *c, char *cmd) {
// send the command to each callback using userdata
switch (cmd[0]) {
case 'v':
pa_context_get_sink_info_by_index(c, command_sink_index, sink_info_set_volume_callback, (void *)cmd);
break;
}
}
/* main */
int main() {
// initialize threaded pulse mainloop
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, "pavolctld");
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);
// listen for commands
while (fgets(stdin_buffer, sizeof(stdin_buffer), stdin) != NULL)
handle_command(context, stdin_buffer);
// clean up
pa_context_disconnect(context);
pa_context_unref(context);
pa_threaded_mainloop_free(mainloop);
return 0;
}
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