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/* _______ ____ __ ___ ___
* \ _ \ \ / \ / \ \ / / ' ' '
* | | \ \ | | || | \/ | . .
* | | | | | | || ||\ /| |
* | | | | | | || || \/ | | ' ' '
* | | | | | | || || | | . .
* | |_/ / \ \__// || | |
* /_______/ynamic \____/niversal /__\ /____\usic /| . . ibliotheque
* / \
* / . \
* clickrem.c - Click removal helpers. / / \ \
* | < / \_
* By entheh. | \/ /\ /
* \_ / > /
* | \ / /
* | ' /
* \__/
*/
#include <stdlib.h>
#include <math.h>
#include "dumb.h"
typedef struct DUMB_CLICK DUMB_CLICK;
struct DUMB_CLICK_REMOVER
{
DUMB_CLICK *click;
int n_clicks;
int offset;
};
struct DUMB_CLICK
{
DUMB_CLICK *next;
long pos;
sample_t step;
};
DUMB_CLICK_REMOVER *dumb_create_click_remover(void)
{
DUMB_CLICK_REMOVER *cr = malloc(sizeof(*cr));
if (!cr) return NULL;
cr->click = NULL;
cr->n_clicks = 0;
cr->offset = 0;
return cr;
}
void dumb_record_click(DUMB_CLICK_REMOVER *cr, long pos, sample_t step)
{
DUMB_CLICK *click;
ASSERT(pos >= 0);
if (!cr || !step) return;
if (pos == 0) {
cr->offset -= step;
return;
}
click = malloc(sizeof(*click));
if (!click) return;
click->pos = pos;
click->step = step;
click->next = cr->click;
cr->click = click;
cr->n_clicks++;
}
static DUMB_CLICK *dumb_click_mergesort(DUMB_CLICK *click, int n_clicks)
{
int i;
DUMB_CLICK *c1, *c2, **cp;
if (n_clicks <= 1) return click;
/* Split the list into two */
c1 = click;
cp = &c1;
for (i = 0; i < n_clicks; i += 2) cp = &(*cp)->next;
c2 = *cp;
*cp = NULL;
/* Sort the sublists */
c1 = dumb_click_mergesort(c1, (n_clicks + 1) >> 1);
c2 = dumb_click_mergesort(c2, n_clicks >> 1);
/* Merge them */
cp = &click;
while (c1 && c2) {
if (c1->pos > c2->pos) {
*cp = c2;
c2 = c2->next;
} else {
*cp = c1;
c1 = c1->next;
}
cp = &(*cp)->next;
}
if (c2)
*cp = c2;
else
*cp = c1;
return click;
}
void dumb_remove_clicks(DUMB_CLICK_REMOVER *cr, sample_t *samples, long length, int step, float halflife)
{
DUMB_CLICK *click;
long pos = 0;
int offset;
int factor;
if (!cr) return;
factor = (int)floor(pow(0.5, 1.0/halflife) * (1U << 31));
click = dumb_click_mergesort(cr->click, cr->n_clicks);
cr->click = NULL;
cr->n_clicks = 0;
length *= step;
while (click) {
DUMB_CLICK *next = click->next;
int end = click->pos * step;
ASSERT(end <= length);
offset = cr->offset;
if (offset < 0) {
offset = -offset;
while (pos < end) {
samples[pos] -= offset;
offset = (int)(((LONG_LONG)(offset << 1) * factor) >> 32);
pos += step;
}
offset = -offset;
} else {
while (pos < end) {
samples[pos] += offset;
offset = (int)(((LONG_LONG)(offset << 1) * factor) >> 32);
pos += step;
}
}
cr->offset = offset - click->step;
free(click);
click = next;
}
offset = cr->offset;
if (offset < 0) {
offset = -offset;
while (pos < length) {
samples[pos] -= offset;
offset = (int)((LONG_LONG)(offset << 1) * factor >> 32);
pos += step;
}
offset = -offset;
} else {
while (pos < length) {
samples[pos] += offset;
offset = (int)((LONG_LONG)(offset << 1) * factor >> 32);
pos += step;
}
}
cr->offset = offset;
}
sample_t dumb_click_remover_get_offset(DUMB_CLICK_REMOVER *cr)
{
return cr ? cr->offset : 0;
}
void dumb_destroy_click_remover(DUMB_CLICK_REMOVER *cr)
{
if (cr) {
DUMB_CLICK *click = cr->click;
while (click) {
DUMB_CLICK *next = click->next;
free(click);
click = next;
}
free(cr);
}
}
DUMB_CLICK_REMOVER **dumb_create_click_remover_array(int n)
{
int i;
DUMB_CLICK_REMOVER **cr;
if (n <= 0) return NULL;
cr = malloc(n * sizeof(*cr));
if (!cr) return NULL;
for (i = 0; i < n; i++) cr[i] = dumb_create_click_remover();
return cr;
}
void dumb_record_click_array(int n, DUMB_CLICK_REMOVER **cr, long pos, sample_t *step)
{
if (cr) {
int i;
for (i = 0; i < n; i++)
dumb_record_click(cr[i], pos, step[i]);
}
}
void dumb_record_click_negative_array(int n, DUMB_CLICK_REMOVER **cr, long pos, sample_t *step)
{
if (cr) {
int i;
for (i = 0; i < n; i++)
dumb_record_click(cr[i], pos, -step[i]);
}
}
void dumb_remove_clicks_array(int n, DUMB_CLICK_REMOVER **cr, sample_t **samples, long length, float halflife)
{
if (cr) {
int i;
for (i = 0; i < n >> 1; i++) {
dumb_remove_clicks(cr[i << 1], samples[i], length, 2, halflife);
dumb_remove_clicks(cr[(i << 1) + 1], samples[i] + 1, length, 2, halflife);
}
if (n & 1)
dumb_remove_clicks(cr[i << 1], samples[i], length, 1, halflife);
}
}
void dumb_click_remover_get_offset_array(int n, DUMB_CLICK_REMOVER **cr, sample_t *offset)
{
if (cr) {
int i;
for (i = 0; i < n; i++)
if (cr[i]) offset[i] += cr[i]->offset;
}
}
void dumb_destroy_click_remover_array(int n, DUMB_CLICK_REMOVER **cr)
{
if (cr) {
int i;
for (i = 0; i < n; i++) dumb_destroy_click_remover(cr[i]);
free(cr);
}
}
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