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Commented stage 2 extensively.

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pjcreath
2005-11-07 20:06:45 +00:00
parent b460e8bb31
commit 8da7896c23
3 changed files with 1035 additions and 83 deletions
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42
lib/paranoia/overlap.c
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@@ -1,5 +1,5 @@
/*
$Id: overlap.c,v 1.4 2005/02/06 15:09:10 rocky Exp $
$Id: overlap.c,v 1.5 2005/11/07 20:06:46 pjcreath Exp $
Copyright (C) 2004, 2005 Rocky Bernstein <rocky@panix.com>
Copyright (C) 1998 Monty xiphmont@mit.edu
@@ -121,6 +121,20 @@ rootfree:
/**** Statistical and heuristic[al? :-] management ************************/
/* ===========================================================================
* offset_adjust_settings (internal)
*
* This function is called by offset_add_value() every time 10 samples have
* been accumulated. This function updates the internal statistics for
* paranoia (dynoverlap, dyndrift) that compensate for jitter and drift.
*
* (dynoverlap) influences how far stage 1 and stage 2 search for matching
* runs. In low-jitter conditions, it will be very small (or even 0),
* narrowing our search. In high-jitter conditions, it will be much larger,
* widening our search at the cost of speed.
*
* ???: To be studied further.
*/
void
offset_adjust_settings(cdrom_paranoia_t *p,
void(*callback)(long int, paranoia_cb_mode_t))
@@ -199,19 +213,43 @@ offset_adjust_settings(cdrom_paranoia_t *p,
}
}
/* ===========================================================================
* 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.
*
* See the bug notes in try_sort_sync() for details.
*/
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+=abs(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);
}
}