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/*
grain.c:
Copyright (C) 1994 Paris Smaragdis, John ffitch
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
*/
/* Granular synthesizer designed and coded by Paris Smaragdis */
/* Berklee College of Music Csound development team */
/* Copyright (c) May 1994. All rights reserved */
/* Some speed hacks added by John Fitch */
#include "stdopcod.h"
#include "grain.h"
static inline MYFLT Unirand(CSOUND *csound, MYFLT a)
{
MYFLT x;
x = (MYFLT) (csound->Rand31(&(csound->randSeed1)) - 1) / FL(2147483645.0);
return (x * a);
}
static int32_t agsset(CSOUND *csound, PGRA *p) /* Granular U.G. set-up */
{
FUNC *gftp, *eftp;
int32 bufsize;
MYFLT *d;
if (LIKELY((gftp = csound->FTFind(csound, p->igfn)) != NULL))
p->gftp = gftp;
else return NOTOK;
if (LIKELY((eftp = csound->FTFind(csound, p->iefn)) != NULL))
p->eftp = eftp;
else return NOTOK;
p->gcount = FL(1.0);
if (*p->opt == 0)
p->pr = (MYFLT)(gftp->flen << gftp->lobits);
else
p->pr = FL(0.0);
bufsize = sizeof(MYFLT) * (2L * (size_t) (CS_ESR * *p->imkglen)
+ (3L * CS_KSMPS));
if (p->aux.auxp == NULL || (uint32_t)bufsize > p->aux.size)
csound->AuxAlloc(csound, bufsize, &p->aux);
else memset(p->aux.auxp, '\0', bufsize); /* Clear any old data */
d = p->x = (MYFLT *)p->aux.auxp;
d += (int32_t)(CS_ESR * *p->imkglen) + CS_KSMPS;
p->y = d;
p->ampadv = IS_ASIG_ARG(p->xamp) ? 1 : 0;
p->lfradv = IS_ASIG_ARG(p->xlfr) ? 1 : 0;
p->dnsadv = IS_ASIG_ARG(p->xdns) ? 1 : 0;
return OK;
}
static int32_t ags(CSOUND *csound, PGRA *p) /* Granular U.G. a-rate main routine */
{
FUNC *gtp, *etp;
MYFLT *buf, *out, *rem, *gtbl, *etbl;
MYFLT *xdns, *xamp, *xlfr, *temp, amp;
int32 isc, isc2, inc, inc2, lb, lb2;
int32 n, bufsize;
int32 ekglen;
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t i, nsmps = CS_KSMPS;
MYFLT kglen = *p->kglen;
MYFLT gcount = p->gcount;
/* Pick up common values to locals for speed */
if (UNLIKELY(p->aux.auxp==NULL)) goto err1;
if (UNLIKELY(kglen<=FL(0.0)))
return csound->PerfError(csound, &(p->h),
Str("grain: grain length zero"));
gtp = p->gftp;
gtbl = gtp->ftable;
etp = p->eftp;
etbl = etp->ftable;
lb = gtp->lobits;
lb2 = etp->lobits;
buf = p->x;
rem = p->y;
out = p->sr;
if (kglen > *p->imkglen) kglen = *p->imkglen;
ekglen = (int32)(CS_ESR * kglen); /* Useful constant */
inc2 = (int32)(csound->sicvt / kglen); /* Constant for each cycle */
bufsize = CS_KSMPS + ekglen;
xdns = p->xdns;
xamp = p->xamp;
xlfr = p->xlfr;
memset(buf, '\0', bufsize*sizeof(MYFLT));
if (UNLIKELY(offset)) memset(out, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&out[nsmps], '\0', early*sizeof(MYFLT));
}
for (i = offset ; i < nsmps ; i++) {
if (gcount >= FL(1.0)) { /* I wonder..... */
gcount = FL(0.0);
amp = *xamp + Unirand(csound, *p->kabnd);
isc = (int32) Unirand(csound, p->pr);
isc2 = 0;
inc = (int32) ((*xlfr + Unirand(csound, *p->kbnd)) * csound->sicvt);
temp = buf + i;
n = ekglen;
do {
*temp++ += amp * *(gtbl + (isc >> lb)) *
*(etbl + (isc2 >> lb2));
isc = (isc +inc )&PHMASK;
isc2 = (isc2+inc2)&PHMASK;
} while (--n);
}
xdns += p->dnsadv;
gcount += *xdns * csound->onedsr;
xamp += p->ampadv;
xlfr += p->lfradv;
}
n = bufsize;
temp = rem;
do {
*temp = *buf++ + *(temp + CS_KSMPS);
temp++;
} while (--n);
memcpy(&out[offset], rem, (nsmps-offset)*sizeof(MYFLT));
p->gcount = gcount;
return OK;
err1:
return csound->PerfError(csound, &(p->h),
Str("grain: not initialised"));
}
#define S(x) sizeof(x)
static OENTRY localops[] =
{
{ "grain", S(PGRA), TR, 3, "a", "xxxkkkiiio", (SUBR)agsset, (SUBR)ags }
};
int32_t grain_init_(CSOUND *csound)
{
return csound->AppendOpcodes(csound, &(localops[0]),
(int32_t
) (sizeof(localops) / sizeof(OENTRY)));
}
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