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);
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);