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/*
* This file has been modified for the cdrkit suite.
*
* The behaviour and appearence of the program code below can differ to a major
* extent from the version distributed by the original author(s).
*
* For details, see Changelog file distributed with the cdrkit package. If you
* received this file from another source then ask the distributing person for
* a log of modifications.
*
*/
/* @(#)overlap.c 1.11 04/02/20 J. Schilling from cdparanoia-III-alpha9.8 */
/*
* Modifications to make the code portable Copyright (c) 2002 J. Schilling
*/
/*
* CopyPolicy: GNU Public License 2 applies
* Copyright (C) by Monty (xiphmont@mit.edu)
*
* Statistic code and cache management for overlap settings
*
*/
#include <mconfig.h>
#include <stdxlib.h>
#include <standard.h>
#include <utypes.h>
#include "p_block.h"
#include "cdda_paranoia.h"
#include "overlap.h"
#include "isort.h"
void paranoia_resetcache(cdrom_paranoia *p);
void paranoia_resetall(cdrom_paranoia *p);
void i_paranoia_trim(cdrom_paranoia *p, long beginword, long endword);
void offset_adjust_settings(cdrom_paranoia *p, void (*callback)(long, int));
void offset_add_value(cdrom_paranoia *p, offsets *o, long value,
void (*callback)(long, int));
/*
* Internal cache management
*/
void paranoia_resetcache(cdrom_paranoia *p)
{
c_block *c = c_first(p);
v_fragment *v;
while (c) {
free_c_block(c);
c = c_first(p);
}
v = v_first(p);
while (v) {
free_v_fragment(v);
v = v_first(p);
}
}
void paranoia_resetall(cdrom_paranoia *p)
{
p->root.returnedlimit = 0;
p->dyndrift = 0;
p->root.lastsector = 0;
if (p->root.vector) {
i_cblock_destructor(p->root.vector);
p->root.vector = NULL;
}
paranoia_resetcache(p);
}
void i_paranoia_trim(cdrom_paranoia *p, long beginword, long endword)
{
root_block *root = &(p->root);
if (root->vector != NULL) {
long target = beginword - p->maxdynoverlap;
long rbegin = cb(root->vector);
long rend = ce(root->vector);
if (rbegin > beginword)
goto rootfree;
if (rbegin + p->maxdynoverlap < beginword) {
if (target + MIN_WORDS_OVERLAP > rend)
goto rootfree;
{
long offset = target - rbegin;
c_removef(root->vector, offset);
}
} {
c_block *c = c_first(p);
while (c) {
c_block *next = c_next(c);
if (ce(c) < beginword - p->maxdynoverlap)
free_c_block(c);
c = next;
}
}
}
return;
rootfree:
i_cblock_destructor(root->vector);
root->vector = NULL;
root->returnedlimit = -1;
root->lastsector = 0;
}
/*
* Statistical and heuristic[al? :-] management
*/
void offset_adjust_settings(cdrom_paranoia *p, void (*callback)(long, int))
{
if (p->stage2.offpoints >= 10) {
/*
* drift: look at the average offset value. If it's over one
* sector, frob it. We just want a little hysteresis [sp?]
*/
long av = (p->stage2.offpoints ? p->stage2.offaccum / p->stage2.offpoints : 0);
if (abs(av) > p->dynoverlap / 4) {
av = (av / MIN_SECTOR_EPSILON) * MIN_SECTOR_EPSILON;
if (callback)
(*callback) (ce(p->root.vector), PARANOIA_CB_DRIFT);
p->dyndrift += av;
/*
* Adjust all the values in the cache otherwise we get
* a (potentially unstable) feedback loop
*/
{
c_block *c = c_first(p);
v_fragment *v = v_first(p);
while (v && v->one) {
/*
* safeguard beginning bounds case with
* a hammer
*/
if (fb(v) < av || cb(v->one) < av) {
v->one = NULL;
} else {
fb(v) -= av;
}
v = v_next(v);
}
while (c) {
long adj = min(av, cb(c));
c_set(c, cb(c) - adj);
c = c_next(c);
}
}
p->stage2.offaccum = 0;
p->stage2.offmin = 0;
p->stage2.offmax = 0;
p->stage2.offpoints = 0;
p->stage2.newpoints = 0;
p->stage2.offdiff = 0;
}
}
if (p->stage1.offpoints >= 10) {
/*
* dynoverlap: we arbitrarily set it to 4x the running
* difference value, unless min/max are more
*/
p->dynoverlap = (p->stage1.offpoints ? p->stage1.offdiff /
p->stage1.offpoints * 3 : CD_FRAMEWORDS);
if (p->dynoverlap < -p->stage1.offmin * 1.5)
p->dynoverlap = -p->stage1.offmin * 1.5;
if (p->dynoverlap < p->stage1.offmax * 1.5)
p->dynoverlap = p->stage1.offmax * 1.5;
if (p->dynoverlap < p->mindynoverlap)
p->dynoverlap = p->mindynoverlap;
if (p->dynoverlap > p->maxdynoverlap)
p->dynoverlap = p->maxdynoverlap;
if (callback)
(*callback) (p->dynoverlap, PARANOIA_CB_OVERLAP);
if (p->stage1.offpoints > 600) {
/*
* bit of a bug; this routine is called too often
* due to the overlap mesh alg we use in stage 1
*/
p->stage1.offpoints /= 1.2;
p->stage1.offaccum /= 1.2;
p->stage1.offdiff /= 1.2;
}
p->stage1.offmin = 0;
p->stage1.offmax = 0;
p->stage1.newpoints = 0;
}
}
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);
}
}
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