atw_duration
int atw_compute_duration1(int, int, uint32_t, int, struct atw_duration *);
int, struct atw_duration *, struct atw_duration *, int *, int);
struct atw_duration *d)
int fraglen, int rate, struct atw_duration *d0, struct atw_duration *dn,
struct atw_duration txs_d0;
struct atw_duration txs_dn;