void offset_add_value(cdrom_paranoia *p,offsets *o,long value,
void(*callback)(long,int)){
if(o->offpoints!=-1){
o->offdiff+=abs(value);
o->offpoints++;
o->newpoints++;
o->offaccum+=value;
if(value<o->offmin)o->offmin=value;
if(value>o->offmax)o->offmax=value;
if(o->newpoints>=10)offset_adjust_settings(p,callback);
}
}
/* ===========================================================================
* offset_add_value (internal)
*
* This function adds the given jitter detected (value) to the statistics
* for the given stage (o). It is called whenever jitter has been identified
* by stage 1 or 2. After every 10 samples, we update the overall jitter-
* compensation settings (e.g. dynoverlap). This allows us to narrow our
* search for matching runs (in both stages) in low-jitter conditions
* and also widen our search appropriately when there is jitter.
*
*
* "???BUG???:
* Note that there is a bug in the way that this is called by try_sort_sync().
* Silence looks like zero jitter, and dynoverlap may be incorrectly reduced
* when there's lots of silence but also jitter."
*
* Strictly speaking, this is only sort-of true. The silence will
* incorrectly somewhat reduce dynoverlap. However, it will increase
* again once past the silence (even if reduced to zero, it will be
* increased by the block read loop if we're not getting matches).
* In reality, silence usually passes rapidly. Anyway, long streaks
* of silence benefit performance-wise from having dynoverlap decrease
* momentarily. There is no correctness bug. --Monty
*
*/
void
offset_add_value(cdrom_paranoia_t *p,offsets *o,long value,
void(*callback)(long int, paranoia_cb_mode_t))
{
if(o->offpoints!=-1){
/* Track the average magnitude of jitter (in either direction) */
o->offdiff += labs(value);
o->offpoints++;
o->newpoints++;
/* Track the net value of the jitter (to track drift) */
o->offaccum+=value;
/* Track the largest jitter we've encountered in each direction */
if(value<o->offmin)o->offmin=value;
if(value>o->offmax)o->offmax=value;
/* After 10 samples, update dynoverlap, etc. */
if(o->newpoints>=10)offset_adjust_settings(p,callback);
}
}
