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/*
sc_noise.c:
Based on the noise ugens of SuperCollider.
Copyright (c) Tito Latini, 2012
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
08.03.2015 gausstrig was fixed to properly work at k-time.
Also I added an optional feature related to the behavior
of very first impulse.
-- Gleb Rogozinsky
Code corrected 22 Dec 2017 by JPff
*/
#include "csoundCore.h"
typedef struct {
OPDS h;
MYFLT *out, *kamp, *kdensity, density0, thresh, scale;
int32 rand;
} DUST;
typedef struct {
OPDS h;
/* 8.03.15 Added new option ifrst1 --Gleb R */
MYFLT *out, *kamp, *kfrq, *kdev, *imode, *ifrst1, frq0, first;
int32 count, rand, mmode;
} GAUSSTRIG;
#define BIPOLAR 0x7FFFFFFF /* Constant to make bipolar */
#define dv2_31 (FL(4.656612873077392578125e-10))
static int32_t dust_init(CSOUND *csound, DUST *p)
{
p->density0 = FL(0.0);
p->thresh = FL(0.0);
p->scale = FL(0.0);
p->rand = csoundRand31(&csound->randSeed1);
return OK;
}
static int32_t dust_process_krate(CSOUND *csound, DUST *p)
{
MYFLT density, thresh, scale, r;
density = *p->kdensity;
if (density != p->density0) {
thresh = p->thresh = density * csound->onedsr*csound->ksmps;
scale = p->scale = (thresh > FL(0.0) ? FL(1.0) / thresh : FL(0.0));
p->density0 = density;
}
else {
thresh = p->thresh;
scale = p->scale;
}
p->rand = csoundRand31(&p->rand);
r = (MYFLT)p->rand * dv2_31;
*p->out = *p->kamp * (r < thresh ? r*scale : FL(0.0));
return OK;
}
static int32_t dust_process_arate(CSOUND *csound, DUST *p)
{
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t n, nsmps = CS_KSMPS;
MYFLT *out, density, thresh, scale;
out = p->out;
density = *p->kdensity;
if (density != p->density0) {
thresh = p->thresh = density * csound->onedsr;
scale = p->scale = (thresh > FL(0.0) ? FL(1.0) / thresh : FL(0.0));
p->density0 = density;
}
else {
thresh = p->thresh;
scale = p->scale;
}
if (UNLIKELY(offset)) memset(p->out, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&p->out[nsmps], '\0', early*sizeof(MYFLT));
}
//memset(out, '\0', offset*sizeof(MYFLT));
for (n=offset; n<nsmps; n++) {
MYFLT r;
p->rand = csoundRand31(&p->rand);
r = (MYFLT)p->rand * dv2_31;
out[n] = *p->kamp * (r < thresh ? r*scale : FL(0.0));
}
return OK;
}
static int32_t dust2_process_krate(CSOUND *csound, DUST *p)
{
MYFLT density, thresh, scale, r;
density = *p->kdensity;
if (density != p->density0) {
thresh = p->thresh = density * csound->onedsr*csound->ksmps;
scale = p->scale = (thresh > FL(0.0) ? FL(2.0) / thresh : FL(0.0));
p->density0 = density;
}
else {
thresh = p->thresh;
scale = p->scale;
}
p->rand = csoundRand31(&p->rand);
r = (MYFLT)p->rand * dv2_31;
*p->out = *p->kamp * (r < thresh ? r*scale - FL(1.0) : FL(0.0));
return OK;
}
static int32_t dust2_process_arate(CSOUND *csound, DUST *p)
{
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t n, nsmps = CS_KSMPS;
MYFLT *out, density, thresh, scale;
out = p->out;
density = *p->kdensity;
if (density != p->density0) {
thresh = p->thresh = density * csound->onedsr;
scale = p->scale = (thresh > FL(0.0) ? FL(2.0) / thresh : FL(0.0));
p->density0 = density;
}
else {
thresh = p->thresh;
scale = p->scale;
}
if (UNLIKELY(offset)) memset(p->out, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&p->out[nsmps], '\0', early*sizeof(MYFLT));
}
//memset(out, '\0', offset*sizeof(MYFLT));
for (n=offset; n<nsmps; n++) {
MYFLT r;
p->rand = csoundRand31(&p->rand);
r = (MYFLT)p->rand * dv2_31;
out[n] = *p->kamp * (r < thresh ? r*scale - FL(1.0) : FL(0.0));
}
return OK;
}
/* gausstrig opcode based on Bhob Rainey's GaussTrig ugen */
static int32_t gausstrig_init(CSOUND* csound, GAUSSTRIG *p)
{
p->rand = csoundRand31(&csound->randSeed1);
p->first = *p->ifrst1;
#if 0
if (*p->ifrst1 > FL(0.0)) {
/* values less than FL(0.0) could be used in later versions
as an offset in samples */
int32_t nextsamps;
MYFLT nextcount, frq, dev, r1, r2;
p->frq0 = *p->kfrq;
frq = (*p->kfrq > FL(0.001) ? *p->kfrq : FL(0.001));
dev = *p->kdev;
nextsamps = (int32_t)(csound->GetSr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
}
#endif
//else {
/* GaussTrig UGen behavior */
p->count = 0;
//}
/*
* imode > 0 means better frequency modulation. If the frequency
* changes, the delay before the next impulse is calculed again.
* With the default imode value we have the classic behavior of
* the GaussTrig ugen, where the freq modulation is bypassed
* during the delay time that precedes the next impulse.
*/
p->mmode = (*p->imode <= FL(0.0) ? 0 : 1);
return OK;
}
/* a separate k-time init for proper work of gausstrig */
static int32_t gausstrig_initk(CSOUND* csound, GAUSSTRIG *p)
{
p->rand = csoundRand31(&csound->randSeed1);
p->first = *p->ifrst1;
#if 0
if (*p->ifrst1 > FL(0.0)) {
/* values less than FL(0.0) could be used in later versions
as an offset in samples */
int32_t nextsamps;
MYFLT nextcount, frq, dev, r1, r2;
p->frq0 = *p->kfrq;
frq = (*p->kfrq > FL(0.001) ? *p->kfrq : FL(0.001));
dev = *p->kdev;
/* this very line of k-time fix. Changed GetSt to GetKr */
nextsamps = (int32_t)(csound->GetKr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
}
#endif
//else {
/* GaussTrig UGen behavior */
p->count = 0;
//}
p->mmode = (*p->imode <= FL(0.0) ? 0 : 1);
return OK;
}
static int32_t gausstrig_process_krate(CSOUND* csound, GAUSSTRIG *p)
{
MYFLT frq, dev;
p->frq0 = *p->kfrq;
frq = (*p->kfrq > FL(0.001) ? *p->kfrq : FL(0.001));
dev = *p->kdev;
if (p->first > 0) {
/* values less than FL(0.0) could be used in later versions
as an offset in samples */
int32_t nextsamps;
MYFLT nextcount, r1, r2;
/* this very line of k-time fix. Changed GetSt to GetKr */
nextsamps = (int32_t)(csound->GetKr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
p->first = 0;
}
if (p->count <= 0) {
int32_t nextsamps;
MYFLT nextcount, r1, r2;
/* this very line of k-time fix. Changed GetSt to GetKr */
nextsamps = (int32_t)(csound->GetKr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
*p->out = *p->kamp;
}
else {
if (p->mmode && *p->kfrq != p->frq0)
p->count = 0;
*p->out = FL(0.0);
}
p->count--;
return OK;
}
static int32_t gausstrig_process_arate(CSOUND* csound, GAUSSTRIG *p)
{
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t n, nsmps = CS_KSMPS;
MYFLT *out = p->out;
MYFLT frq, dev;
p->frq0 = *p->kfrq;
frq = (p->frq0 > FL(0.001) ? p->frq0 : FL(0.001));
dev = *p->kdev;
if (UNLIKELY(offset)) memset(p->out, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&p->out[nsmps], '\0', early*sizeof(MYFLT));
}
//memset(out, '\0', offset*sizeof(MYFLT));
if (p->first > FL(0.0)) {
/* values less than FL(0.0) could be used in later versions
as an offset in samples */
int32_t nextsamps;
MYFLT nextcount, dev, r1, r2;
//p->frq0 = *p->kfrq;
//frq = (p->frq0 > FL(0.001) ? p->frq0 : FL(0.001));
dev = *p->kdev;
nextsamps = (int32_t)(csound->GetSr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
p->first = 0; /* Only once called */
}
for (n=offset; n<nsmps; n++) {
if (p->count <= 0) {
int32_t nextsamps;
MYFLT nextcount, r1, r2;
nextsamps = (int32_t)(csound->GetSr(csound) / frq);
p->rand = csoundRand31(&p->rand);
r1 = (MYFLT)p->rand * dv2_31;
p->rand = csoundRand31(&p->rand);
r2 = (MYFLT)p->rand * dv2_31;
nextcount = SQRT(FL(-2.0) * LOG(r1)) * SIN(r2 * TWOPI_F);
if (nextcount < FL(-1.0)) {
MYFLT diff = FL(-1.0) - nextcount;
nextcount = (FL(1.0) < FL(-1.0) + diff ? FL(1.0) : FL(-1.0) + diff);
}
else if (nextcount > FL(1.0)) {
MYFLT diff = nextcount - FL(1.0);
nextcount = (FL(-1.0) > FL(1.0) - diff ? FL(-1.0) : FL(1.0) - diff);
}
p->count = (int32_t)(nextsamps + nextcount * dev * nextsamps);
out[n] = *p->kamp;
}
else {
if (p->mmode && *p->kfrq != p->frq0)
p->count = 0;
out[n] = FL(0.0);
}
p->count--;
}
return OK;
}
static OENTRY scnoise_localops[] = {
{ "dust.k", sizeof(DUST), 0,3, "k", "kk",
(SUBR)dust_init, (SUBR)dust_process_krate, NULL },
{ "dust.a", sizeof(DUST), 0,3, "a", "kk",
(SUBR)dust_init, (SUBR)dust_process_arate },
{ "dust2.k", sizeof(DUST), 0,3, "k", "kk",
(SUBR)dust_init, (SUBR)dust2_process_krate, NULL },
{ "dust2.a", sizeof(DUST), 0,3, "a", "kk",
(SUBR)dust_init, (SUBR)dust2_process_arate },
{ "gausstrig.k", sizeof(GAUSSTRIG), 0,3, "k", "kkkoo",
(SUBR)gausstrig_initk, (SUBR)gausstrig_process_krate, NULL },
{ "gausstrig.a", sizeof(GAUSSTRIG), 0,3, "a", "kkkoo",
(SUBR)gausstrig_init, (SUBR)gausstrig_process_arate }
};
LINKAGE_BUILTIN(scnoise_localops)
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