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/*
bowedbar.c:
Copyright (C) 1999 Perry Cook, Georg Essl, 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
*/
/*********************************************/
/* Bowed Bar model */
/* by Georg Essl, 1999 */
/* For details refer to: */
/* G.Essl, P.R.Cook: "Banded Waveguides: */
/* Towards Physical Modelling of Bar */
/* Percussion Instruments", ICMC'99 */
/*********************************************/
// #include "csdl.h"
#include "csoundCore.h"
#include "bowedbar.h"
/* Number of banded waveguide modes */
static void make_DLineN(CSOUND *csound, DLINEN *p, int32 length)
{
/* Writing before reading allows delays from 0 to length-1.
Thus, if we want to allow a delay of max_length, we need
a delay-line of length = max_length+1. */
p->length = length = length+1;
csound->AuxAlloc(csound, length * sizeof(MYFLT), &p->inputs);
p->inPoint = 0;
p->outPoint = length >> 1;
p->lastOutput = FL(0.0);
}
static void DLineN_setDelay(CSOUND *csound, DLINEN *p, int32_t lag)
{
if (UNLIKELY(lag > p->length-1)) { /* if delay is too big, */
csound->Warning(csound, Str("DLineN: Delay length too big ... setting to "
"maximum length of %d.\n"), p->length - 1);
p->outPoint = p->inPoint + 1; /* force delay to max_length */
}
else
p->outPoint = p->inPoint - (int32) lag; /* read chases write */
while (p->outPoint<0)
p->outPoint += p->length; /* modulo maximum length */
}
static void DLineN_tick(DLINEN *p, MYFLT sample) /* Take one, yield one */
{
MYFLT *xx = (MYFLT*)p->inputs.auxp;
xx[p->inPoint++] = sample; /* Input next sample */
if (UNLIKELY(p->inPoint == p->length)) /* Check for end condition */
p->inPoint -= p->length;
p->lastOutput = xx[p->outPoint++]; /* Read nxt value */
if (UNLIKELY(p->outPoint>=p->length)) /* Check for end condition */
p->outPoint -= p->length;
}
int32_t bowedbarset(CSOUND *csound, BOWEDBAR *p)
{
int32 i;
MYFLT amplitude = *p->amp * AMP_RSCALE;
p->modes[0] = FL(1.0);
p->modes[1] = FL(2.756);
p->modes[2] = FL(5.404);
p->modes[3] = FL(8.933);
make_BiQuad(&p->bandpass[0]);
make_BiQuad(&p->bandpass[1]);
make_BiQuad(&p->bandpass[2]);
make_BiQuad(&p->bandpass[3]);
make_ADSR(&p->adsr);
ADSR_setAllTimes(csound, &p->adsr, FL(0.02), FL(0.005), FL(0.9), FL(0.01));
if (LIKELY(*p->lowestFreq>=FL(0.0))) { /* If no init skip */
if (*p->lowestFreq!=FL(0.0))
p->length = (int32) (CS_ESR / *p->lowestFreq + FL(1.0));
else if (*p->frequency!=FL(0.0))
p->length = (int32) (CS_ESR / *p->frequency + FL(1.0));
else {
csound->Warning(csound,
Str("unknown lowest frequency for bowed bar -- "
"assuming 50Hz\n"));
p->length = (int32) (CS_ESR / FL(50.0) + FL(1.0));
}
}
p->nr_modes = NR_MODES;
for (i = 0; i<NR_MODES; i++) {
make_DLineN(csound, &p->delay[i], p->length);
DLineN_setDelay(csound, &p->delay[i], (int32_t)(p->length/p->modes[i]));
BiQuad_clear(&p->bandpass[i]);
}
/* p->gains[0] = FL(0.0); */
/* p->gains[1] = FL(0.0); */
/* p->gains[2] = FL(0.0); */
/* p->gains[3] = FL(0.0); */
p->adsr.target = FL(0.0);
p->adsr.value = FL(0.0);
p->adsr.rate = amplitude * FL(0.001);
p->adsr.state = ATTACK;
p->lastBowPos = FL(0.0);
p->bowTarg = FL(0.0);
p->freq = -FL(1.0);
p->lastpos = -FL(1.0);
p->lastpress = p->bowvel = p->velinput = FL(0.0);
p->kloop = 0;
p->bowTabl.offSet = p->bowTabl.slope = FL(0.0);
return OK;
}
int32_t bowedbar(CSOUND *csound, BOWEDBAR *p)
{
MYFLT *ar = p->ar;
uint32_t offset = p->h.insdshead->ksmps_offset;
uint32_t early = p->h.insdshead->ksmps_no_end;
uint32_t n, nsmps = CS_KSMPS;
MYFLT amp = (*p->amp)*AMP_RSCALE; /* Normalise */
int32 k;
int32_t i;
MYFLT maxVelocity;
MYFLT integration_const = *p->integration_const;
if (p->lastpress != *p->bowPress)
p->bowTabl.slope = p->lastpress = *p->bowPress;
if (p->freq != *p->frequency) {
p->freq = *p->frequency;
if (p->freq > FL(1568.0)) p->freq = FL(1568.0);
p->length = (int32_t)(CS_ESR/p->freq);
p->nr_modes = NR_MODES; /* reset for frequency shift */
for (i = 0; i<NR_MODES; i++) {
if ((int32_t)(p->length/p->modes[i]) > 4)
DLineN_setDelay(csound, &p->delay[i], (int32_t)(p->length/p->modes[i]));
else {
p->nr_modes = i;
break;
}
}
if (UNLIKELY(p->nr_modes==0))
return csound->InitError(csound,
Str("Bowedbar: cannot have zero modes\n"));
for (i=0; i<p->nr_modes; i++) {
MYFLT R = FL(1.0) - p->freq * p->modes[i] * csound->pidsr;
BiQuad_clear(&p->bandpass[i]);
BiQuad_setFreqAndReson(p->bandpass[i], p->freq * p->modes[i], R);
BiQuad_setEqualGainZeroes(p->bandpass[i]);
BiQuad_setGain(p->bandpass[i], (FL(1.0)-R*R)*FL(0.5));
}
}
/* Bow position as well */
if (*p->position != p->lastpos) {
MYFLT temp2 = *p->position * PI_F;
p->gains[0] = FABS(SIN(temp2 * FL(0.5))) /* * pow(0.9,0))*/;
p->gains[1] = FABS(SIN(temp2) * FL(0.9));
p->gains[2] = FABS(SIN(temp2 * FL(1.5)) * FL(0.9)*FL(0.9));
p->gains[3] = FABS(SIN(temp2 * FL(2.0)) * FL(0.9)*FL(0.9)*FL(0.9));
p->lastpos = *p->position;
}
if (*p->bowposition != p->lastBowPos) { /* Not sure what this control is? */
p->bowTarg += FL(0.02) * (*p->bowposition - p->lastBowPos);
p->lastBowPos = *p->bowposition;
ADSR_setTarget(csound, &p->adsr, p->lastBowPos);
p->lastBowPos = *p->bowposition;
}
if (p->kloop>0 && p->h.insdshead->relesing) p->kloop=1;
if ((--p->kloop) == 0) {
ADSR_setReleaseRate(csound, &p->adsr, (FL(1.0) - amp) * FL(0.005));
p->adsr.target = FL(0.0);
p->adsr.rate = p->adsr.releaseRate;
p->adsr.state = RELEASE;
}
maxVelocity = FL(0.03) + (FL(0.5) * amp);
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++) {
MYFLT data = FL(0.0);
MYFLT input = FL(0.0);
if (integration_const == FL(0.0))
p->velinput = FL(0.0);
else
p->velinput = integration_const * p->velinput;
for (k=0; k<p->nr_modes; k++) {
p->velinput += *p->GAIN * p->delay[k].lastOutput;
}
if (*p->trackVel) {
p->bowvel *= FL(0.9995);
p->bowvel += p->bowTarg;
p->bowTarg *= FL(0.995);
}
else
p->bowvel = ADSR_tick(&p->adsr)*maxVelocity;
input = p->bowvel - p->velinput;
input = input * BowTabl_lookup(csound, &p->bowTabl, input);
input = input/(MYFLT)p->nr_modes;
for (k=0; k<p->nr_modes; k++) {
BiQuad_tick(&p->bandpass[k],
input*p->gains[k] + *p->GAIN * p->delay[k].lastOutput);
DLineN_tick(&p->delay[k], p->bandpass[k].lastOutput);
data += p->bandpass[k].lastOutput;
}
ar[n] = data * AMP_SCALE * FL(20.0); /* 20 is an experimental value */
}
return OK;
}
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