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/*
shaker.c:
Copyright (C) 1996, 1997 Perry Cook, 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
*/
/********************************************************/
/* Maracha SImulation by Perry R. Cook, 1996 */
/********************************************************/
/********************************************************/
/* In real life, each grain has an individual
sound and envelope, but if you buy the
notion that each sound is independent
noise, the sum of a bunch of independent
exponentially decaying enveloped noises
is a single exponentially decaying enveloped
noise. shakeEnergy is an exponentially
decaying, but reexcitable by shaking, energy
expressing how loud a single collision will be.
This code would implement individual grain envelopes
if (random(8) < 1) {
noises[which] = 1024 * shakeEnergy;
which += 1;
if (which==MAX) which = 0;
}
input = 0.0;
for (i=0;i<MAX;i++) {
input += noises[i] * noise_tick();
noises[i] *= COLL_DECAY;
}
But we're smarter than that!!! See below
*/
// #include "csdl.h"
#include "csoundCore.h"
#include "shaker.h"
int32_t shakerset(CSOUND *csound, SHAKER *p)
{
MYFLT amp = (*p->amp)*AMP_RSCALE; /* Normalise */
p->shake_speed = FL(0.0008) + (amp * FL(0.0004));
make_BiQuad(&p->filter);
make_ADSR(&p->envelope);
p->res_freq = FL(3200.0);
BiQuad_setFreqAndReson(p->filter, p->res_freq, FL(0.96));
BiQuad_setEqualGainZeroes(p->filter);
BiQuad_setGain(p->filter, FL(1.0));
p->shakeEnergy = FL(0.0);
p->noiseGain = FL(0.0);
p->coll_damp = FL(0.95);
/* p->shake_damp = 0.999f; */
/* p->num_beans = 8; */
ADSR_setAll(csound, &p->envelope,
p->shake_speed, p->shake_speed, FL(0.0), p->shake_speed);
p->num_beans = (int32_t)*p->beancount;
if (p->num_beans<1) p->num_beans = 1;
p->wait_time = 0x7FFFFFFE / p->num_beans;
p->gain_norm = FL(0.0005);
p->shake_num = (int32_t)*p->times;
ADSR_keyOn(&p->envelope);
p->kloop = (int32_t)(p->h.insdshead->offtim * CS_EKR)
- (int32_t)(CS_EKR * *p->dettack);
p->freq = -FL(1.0); /* So will get changed */
return OK;
}
int32_t shaker(CSOUND *csound, SHAKER *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 */
MYFLT shake = amp + amp;
MYFLT damp = *p->shake_damp;
MYFLT gain = p->gain_norm;
MYFLT ngain = p->noiseGain;
MYFLT sEnergy = p->shakeEnergy;
MYFLT shake_speed = FL(0.0008) + amp * FL(0.0004);
if (p->freq != *p->kfreq)
BiQuad_setFreqAndReson(p->filter, p->freq = *p->kfreq, FL(0.96));
if (p->num_beans != (int32_t)*p->beancount) { /* Bean Count */
p->num_beans = (int32_t
)*p->beancount;
p->wait_time = 0x7FFFFFFE / p->num_beans;
}
if (shake_speed != p->shake_speed) {
p->shake_speed = shake_speed;
ADSR_setAll(csound,
&p->envelope, shake_speed, shake_speed, FL(0.0), shake_speed);
}
if (p->kloop>0 && p->h.insdshead->relesing) p->kloop=1;
if ((--p->kloop) == 0) {
p->shake_num = 0;
}
if (UNLIKELY(offset)) memset(ar, '\0', offset*sizeof(MYFLT));
if (UNLIKELY(early)) {
nsmps -= early;
memset(&ar[nsmps], '\0', early*sizeof(MYFLT));
}
gain *= p->num_beans; /* Save work in loop */
for (n=offset; n<nsmps; n++) {
MYFLT lastOutput;
MYFLT temp;
ADSR_tick(&p->envelope);
temp = p->envelope.value * shake;
if (p->shake_num>0) {
if (p->envelope.state==SUSTAIN) {
if (p->shake_num < 64)
p->shake_num -= 1;
ADSR_keyOn(&p->envelope);
}
}
if (temp > sEnergy)
sEnergy = temp;
sEnergy *= damp; /* Exponential System Decay */
/* There's Roughly Constant Probablity of a Collision, and */
/* Energy of Each Collision is Weighted by Exponentially */
/* Decaying System Energy. All add together for total */
/* exponentially decaying sound energy. */
if (csound->Rand31(&(csound->randSeed1)) <= p->wait_time) {
ngain += gain * sEnergy;
}
/* Actual Sound is Random */
lastOutput = ngain * ((MYFLT) csound->Rand31(&(csound->randSeed1))
- FL(1073741823.5))
* (MYFLT) (1.0 / 1073741823.0);
/* Each (all) event(s) decay(s) exponentially */
ngain *= p->coll_damp;
lastOutput = BiQuad_tick(&p->filter, lastOutput);
ar[n] = lastOutput * AMP_SCALE * FL(7.0); /* As too quiet */
}
p->noiseGain = ngain;
p->shakeEnergy = sEnergy;
return OK;
}
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