pulseaudio: track only the default sink and source

[layus]

When you have multiple sinks (resp. sources), the module used to display
the state of the most recently changed one. This changes remembers the
default sink name, and only records changes to that one.

[Alexays]

Nice!
serverInfoCb handle default change or the default sink is assigned only one time?

[layus]

Not sure I understand.

serverInfoCb is called everytime a serverInfo changes, and once at startup. Changes to serverInfo include changes to default sink/source name.

      pa_context_get_server_info(c, serverInfoCb, data);
      pa_context_set_subscribe_callback(c, subscribeCb, data);
      pa_context_subscribe(...

void waybar::modules::Pulseaudio::subscribeCb(...) {
  // ...
  if (facility == PA_SUBSCRIPTION_EVENT_SERVER) {
    pa_context_get_server_info(context, serverInfoCb, data);
  } 

[Alexays]

Just checked and it's ok.
Thanks, nice stuff 😃