-void *check_writer_arg(const char *wa, int *writer_num);
-struct writer_node_group *setup_default_wng(void);
-void print_writer_helps(int detailed);
-struct writer_node *setup_writer_node(const char *arg, struct btr_node *parent);
+void *check_writer_arg_or_die(const char *wa, int *writer_num);
+void print_writer_helps(unsigned flags);
+void register_writer_node(struct writer_node *wn, struct btr_node *parent,
+ struct sched *s);
+void get_btr_sample_rate(struct btr_node *btrn, int32_t *result);
+void get_btr_channels(struct btr_node *btrn, int32_t *result);
+void get_btr_sample_format(struct btr_node *btrn, int32_t *result);