449  * Sound Tools rate change effect file.
468 struct rate {  struct
480     struct rate *rate = g_new0(struct rate, 1);  in st_rate_start()  argument
482     rate->opos = 0;  in st_rate_start()
485     rate->opos_inc = ((uint64_t) inrate << 32) / outrate;  in st_rate_start()
487     rate->ipos = 0;  in st_rate_start()
488     rate->ilast.l = 0;  in st_rate_start()
489     rate->ilast.r = 0;  in st_rate_start()
490     return rate;  in st_rate_start()
510  * @opaque: pointer to struct rate
519     struct rate *rate = opaque;  in st_rate_frames_out()  local
524     if (rate->opos_inc == 1ULL << 32) {  in st_rate_frames_out()
533     /* last frame read was at rate->ipos - 1 */  in st_rate_frames_out()
534     ipos_end = rate->ipos - 1 + frames_in;  in st_rate_frames_out()
537     /* last frame written was at rate->opos - rate->opos_inc */  in st_rate_frames_out()
538     if (opos_end + rate->opos_inc <= rate->opos) {  in st_rate_frames_out()
541     opos_delta = opos_end - rate->opos + rate->opos_inc;  in st_rate_frames_out()
542     frames_out = opos_delta / rate->opos_inc;  in st_rate_frames_out()
544     return opos_delta % rate->opos_inc ? frames_out : frames_out - 1;  in st_rate_frames_out()
551  * @opaque: pointer to struct rate
559     struct rate *rate = opaque;  in st_rate_frames_in()  local
563     if (rate->opos_inc == 1ULL << 32) {  in st_rate_frames_in()
568         opos_start = rate->opos;  in st_rate_frames_in()
569         ipos_start = rate->ipos;  in st_rate_frames_in()
574         offset = (rate->opos_inc + (1ULL << 32) - 1) & ~((1ULL << 32) - 1);  in st_rate_frames_in()
575         opos_start = rate->opos + offset;  in st_rate_frames_in()
576         ipos_start = rate->ipos + (offset >> 32);  in st_rate_frames_in()
578     /* last frame written was at opos_start - rate->opos_inc */  in st_rate_frames_in()
579     opos_end = opos_start - rate->opos_inc + rate->opos_inc * frames_out;  in st_rate_frames_in()