unsigned pa_source_linked_by(pa_source *s); /* Number of connected streams */
unsigned pa_source_used_by(pa_source *s); /* Number of connected streams that are not corked */
+unsigned pa_source_check_suspend(pa_source *s); /* Returns how many streams are active that don't allow suspensions */
#define pa_source_get_state(s) ((pa_source_state_t) (s)->state)
/* To be called exclusively by the source driver, from IO context */