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/*
ugensa.c:
Copyright (C) 1997 J. Michael Clarke, based on ideas from CHANT (IRCAM)
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
*/
#include "stdopcod.h" /* UGENSA.C */
#include "ugensa.h"
#include "ugens7.h"
#include <math.h>
/* FOG generator */
static int32_t newpulse(CSOUND *, FOGS *, OVERLAP *, MYFLT *, MYFLT *, MYFLT *);
static int32_t fogset(CSOUND *csound, FOGS *p)
{
/* legato test, not sure if the last bit (auxch) is correct? */
int32_t skip = (*p->iskip != FL(0.0) && p->auxch.auxp != 0);
if (LIKELY((p->ftp1 = csound->FTFind(csound, p->ifna)) != NULL &&
(p->ftp2 = csound->FTFind(csound, p->ifnb)) != NULL)) {
OVERLAP *ovp, *nxtovp;
int32 olaps;
p->fogcvt = FMAXLEN/(p->ftp1)->flen; /*JMC for FOG*/
p->durtogo = (int32)(*p->itotdur * CS_ESR);
if (!skip) { /* legato: skip all memory management */
p->spdphs = 0L; /*JMC for FOG*/
if (*p->iphs == FL(0.0)) /* if fundphs zero, */
p->fundphs = MAXLEN; /* trigger new FOF */
else p->fundphs = (int32)(*p->iphs * FMAXLEN) & PHMASK;
if (UNLIKELY((olaps = (int32)*p->iolaps) <= 0)) {
return csound->InitError(csound, Str("illegal value for iolaps"));
}
if (*p->iphs>=FL(0.0))
csound->AuxAlloc(csound, (size_t)olaps * sizeof(OVERLAP), &p->auxch);
ovp = &p->basovrlap;
nxtovp = (OVERLAP *) p->auxch.auxp;
do {
ovp->nxtact = NULL;
ovp->nxtfree = nxtovp; /* link the ovlap spaces */
ovp = nxtovp++;
} while (--olaps);
ovp->nxtact = NULL;
ovp->nxtfree = NULL;
p->fofcount = -1;
p->prvband = FL(0.0);
p->expamp = FL(1.0);
p->prvsmps = 0;
p->preamp = FL(1.0);
}
p->ampcod = IS_ASIG_ARG(p->xamp) ? 1 : 0;
p->fundcod = IS_ASIG_ARG(p->xdens) ? 1 : 0;
p->formcod = IS_ASIG_ARG(p->xtrans) ? 1 : 0;
p->xincod = p->ampcod || p->fundcod || p->formcod;
/* p->speedcod = (p->XINCODE & 0x8) ? 1 : 0; */ /*out for phs version of fog*/
p->fmtmod = (*p->itmode == 0.0) ? 0 : 1;
}
else return NOTOK;
return OK;
}
static int32_t fog(CSOUND *csound, FOGS *p)
{
OVERLAP *ovp;
FUNC *ftp1, *ftp2;
MYFLT *ar, *amp, *fund, *ptch, *speed;
MYFLT v1, fract ,*ftab, fogcvt = p->fogcvt; /*JMC added for FOG*/
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t n, nsmps = CS_KSMPS;
int32 fund_inc, form_inc;
/* int64_t speed_inc; */ /*JMC added last--out for phs version*/
ar = p->ar;
amp = p->xamp;
fund = p->xdens;
ptch = p->xtrans;
speed = p->xspd;
ftp1 = p->ftp1;
ftp2 = p->ftp2;
fund_inc = (int32)(*fund * csound->sicvt);
form_inc = (int32)(*ptch * fogcvt); /*form_inc = *form * csound->sicvt;*/
/* speed_inc = *speed * fogcvt; */ /*JMC for FOG--out for phs version*/
if (UNLIKELY(offset)) memset(ar, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&ar[nsmps], '\0', early*sizeof(MYFLT));
}
for (n=offset;n<nsmps;n++) {
if (p->fundphs & MAXLEN) { /* if phs has wrapped */
p->fundphs &= PHMASK;
if (UNLIKELY((ovp = p->basovrlap.nxtfree) == NULL)) goto err1;
if (newpulse(csound, p, ovp, amp, fund, ptch)) { /* init new fof */
ovp->nxtact = p->basovrlap.nxtact; /* & link into */
p->basovrlap.nxtact = ovp; /* actlist */
p->basovrlap.nxtfree = ovp->nxtfree;
}
}
ar[n] = FL(0.0);
ovp = &p->basovrlap;
while (ovp->nxtact != NULL) { /* perform cur actlist: */
MYFLT result;
OVERLAP *prvact = ovp;
ovp = ovp->nxtact; /* formant waveform */
fract = PFRAC1(ovp->formphs); /*JMC Fog*/
ftab = ftp1->ftable + (ovp->formphs >> ftp1->lobits);/*JMC Fog*/
v1 = *ftab++; /*JMC Fog*/
result = v1 + (*ftab - v1) * fract; /*JMC Fog*/
/* result = *(ftp1->ftable + (ovp->formphs >> ftp1->lobits) ); FOF version*/
if (p->fmtmod)
ovp->formphs += form_inc; /* inc phs on mode */
else ovp->formphs += ovp->forminc;
ovp->formphs &= PHMASK;
if (ovp->risphs < MAXLEN) { /* formant ris envlp */
result *= *(ftp2->ftable + (ovp->risphs >> ftp2->lobits) );
ovp->risphs += ovp->risinc;
}
if (ovp->timrem <= ovp->dectim) { /* formant dec envlp */
result *= *(ftp2->ftable + (ovp->decphs >> ftp2->lobits) );
if ((ovp->decphs -= ovp->decinc) < 0)
ovp->decphs = 0;
}
ar[n] += (result * ovp->curamp); /* add wavfrm to out */
if (--ovp->timrem) /* if fof not expird */
ovp->curamp *= ovp->expamp; /* apply bw exp dec */
else {
prvact->nxtact = ovp->nxtact; /* else rm frm activ */
ovp->nxtfree = p->basovrlap.nxtfree;/* & ret spc to free */
p->basovrlap.nxtfree = ovp;
ovp = prvact;
}
}
p->fundphs += fund_inc;
/* p->spdphs += speed_inc; */ /*JMC for FOG*/
p->spdphs = (int32)(speed[n] * FMAXLEN); /*for phs version of FOG*/
p->spdphs &= PHMASK; /*JMC for FOG*/
if (p->xincod) {
if (p->ampcod) amp++;
if (p->fundcod) fund_inc = (int32)(*++fund * csound->sicvt);
if (p->formcod) form_inc = (int32)(*++ptch * fogcvt);
/*form_inc = *++form * csound->sicvt;*/
/* if (p->speedcod) speed_inc = *++speed * fogcvt; */ /*JMC for FOG*/
}
p->durtogo--;
}
return OK;
err1:
return csound->PerfError(csound, &(p->h),
Str("FOF needs more overlaps"));
}
static int32_t newpulse(CSOUND *csound, FOGS *p, OVERLAP *ovp, MYFLT *amp,
MYFLT *fund, MYFLT *ptch)
{
MYFLT octamp = *amp, oct;
MYFLT form = *ptch / csound->sicvt, fogcvt = p->fogcvt;
int32 rismps, newexp = 0;
if ((ovp->timrem = (int32)(*p->kdur * CS_ESR)) > p->durtogo &&
(*p->iskip==FL(0.0))) /* ringtime */
return(0);
if ((oct = *p->koct) > 0.0) { /* octaviation */
int64_t cnst = -1L;
int32 ioct = (int32)oct, bitpat = ~(cnst << ioct);
if (bitpat & ++p->fofcount)
return(0);
if ((bitpat += 1) & p->fofcount)
octamp *= (FL(1.0) + ioct - oct);
}
if (*fund == 0.0) /* formant phs */
ovp->formphs = 0;
/* else
ovp->formphs = (int32)((p->fundphs * form / *fund) + p->spdphs) & PHMASK; */
else ovp->formphs = (int32)(p->fundphs * form / *fund) & PHMASK;
ovp->forminc = (int32)(*ptch * fogcvt);/*JMC for FOG*/
/*ovp->forminc = *form * csound->sicvt;*/
if (*p->kband != p->prvband) { /* bw: exp dec */
p->prvband = *p->kband;
p->expamp = EXP(*p->kband * csound->mpidsr);
newexp = 1;
}
if (*p->kris >= csound->onedsr && form != 0.0) { /* init fnb ris */
ovp->risphs = (uint32)(ovp->formphs / (fabs(form))
/ *p->kris); /* JPff fix */
ovp->risinc = (int32)(csound->sicvt / *p->kris);
rismps = MAXLEN / ovp->risinc;
}
else {
ovp->risphs = MAXLEN;
rismps = 0;
}
/* p->spdphs (soundfile ftable index) must be added to
ovp->formphs (sound ftable reading rate)
AFTER ovp-risphs is calculated */
ovp->formphs = (ovp->formphs + p->spdphs) & PHMASK;
if (newexp || rismps != p->prvsmps) { /* if new params */
if ((p->prvsmps = rismps)) /* redo preamp */
p->preamp = csound->intpow(p->expamp, -rismps);
else p->preamp = FL(1.0);
}
ovp->curamp = octamp * p->preamp; /* set startamp */
ovp->expamp = p->expamp;
if ((ovp->dectim = (int32)(*p->kdec * CS_ESR)) > 0) /* fnb dec */
ovp->decinc = (int32)(csound->sicvt / *p->kdec);
ovp->decphs = PHMASK;
return(1);
}
/* JMC test additional UG */
#define S(x) sizeof(x)
static OENTRY localops[] = {
{ "fog", S(FOGS), TR, 3, "a","xxxakkkkkiiiiooo",(SUBR)fogset,(SUBR)fog}
};
int32_t ugensa_init_(CSOUND *csound)
{
return csound->AppendOpcodes(csound, &(localops[0]),
(int32_t) (sizeof(localops) / sizeof(OENTRY)));
}
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