+struct oac_custom_header *oac_custom_header_new(void);
+void oac_custom_header_init(int serial, struct oac_custom_header *h);
+int oac_custom_header_append(ogg_packet *op, struct oac_custom_header *h);
+void oac_custom_header_flush(struct oac_custom_header *h);
+size_t oac_custom_header_get(char **buf, struct oac_custom_header *h);
+