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rob 2008-12-17 20:09:29 +00:00
parent 6e3c27ea85
commit 9428f8d807
2 changed files with 206 additions and 0 deletions

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RFWUGens.scx Executable file

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/*
* rfw-ugens.cpp
* Plugins
*
* Created by Rob Watson on 17/December/2008.
* Copyright 2008 __MyCompanyName__. All rights reserved.
*
* https://github.com/rfwatson
*/
/*
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
auint32 with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "SC_PlugIn.h"
static InterfaceTable *ft;
#define ENVLEN 2000.0 // TODO modulate
struct SwitchDelay : public Unit {
float *buffer;
float prev_samp, offset_start, offset_current;
uint32 writepos, readpos, decaytime, bufsize, offset_timer;
char crossfading;
};
struct AverageOutput : public Unit {
float average, prev_trig;
uint32 count;
};
extern "C" {
void SwitchDelay_next(SwitchDelay *unit, int inNumSamples);
void SwitchDelay_Ctor(SwitchDelay* unit);
void SwitchDelay_Dtor(SwitchDelay* unit);
void AverageOutput_next(AverageOutput *unit, int inNumSamples);
void AverageOutput_Ctor(AverageOutput* unit);
}
void SwitchDelay_Ctor( SwitchDelay* unit ) {
RGen& rgen = *unit->mParent->mRGen;
float *buffer;
unit->bufsize = (uint32)(SAMPLERATE * ZIN0(5));
buffer = unit->buffer = (float *)RTAlloc(unit->mWorld, unit->bufsize * sizeof(float));
for(int i=0; i<unit->bufsize; ++i)
*(buffer+i)=0.; // TODO use memset or something here
unit->decaytime = (uint32)(ZIN0(3) * SAMPLERATE);
unit->writepos = 0;
unit->prev_samp = 0.;
unit->offset_start = 0.;
unit->offset_current = 0.;
unit->offset_timer = ENVLEN;
unit->crossfading = 0;
unit->readpos = ((unit->bufsize - unit->decaytime) + unit->bufsize) % unit->bufsize;
SETCALC(SwitchDelay_next);
}
void SwitchDelay_Dtor(SwitchDelay *unit) {
RTFree(unit->mWorld, unit->buffer);
}
void SwitchDelay_next( SwitchDelay *unit, int inNumSamples ) {
int i;
float recval, readval, ratio;
float *out = OUT(0);
float *in = IN(0);
float *buffer = unit->buffer;
float drylevel = ZIN0(1);
float wetlevel = ZIN0(2);
float delayfactor = ZIN0(4);
float prev_samp = unit->prev_samp;
float offset_current = unit->offset_current;
float offset_start = unit->offset_start;
uint32 decaytime = (uint32)(ZIN0(3) * SAMPLERATE);
uint32 bufsize = unit->bufsize;
uint32 offset_timer = unit->offset_timer;
uint32 writepos = unit->writepos;
uint32 readpos = ((writepos - decaytime) + (bufsize)) % bufsize;
char crossfading = unit->crossfading;
if(decaytime != unit->decaytime) { // move the read pointer
float newval, oldval, offset;
newval = buffer[((readpos - decaytime) + bufsize) % bufsize];
oldval = buffer[readpos] + offset_current; // adding the current offset means that we can modulate again mid-crossfade.
offset = oldval - newval;
crossfading = 1;
offset_start = offset;
offset_current = offset;
offset_timer = ENVLEN;
}
// limit the delay multiplier to reasonable numbers
if(delayfactor < 0.) delayfactor = 0.;
if(delayfactor > 0.9) delayfactor = 0.9;
for(i=0; i < inNumSamples; ++i) {
recval = in[i];
readval = buffer[readpos] + offset_current;
recval = recval + (prev_samp * delayfactor);
out[i] = (in[i] * drylevel) + (readval * wetlevel);
buffer[writepos] = recval;
prev_samp = readval;
readpos = (readpos + 1) % bufsize;
writepos = (writepos + 1) % bufsize;
if(crossfading) {
--offset_timer;
if(offset_timer > 0.) { // still crossfading
ratio = (offset_timer / ENVLEN);
offset_current = offset_start * ratio;
} else { // all done
crossfading = 0;
offset_current = 0.;
}
}
}
unit->crossfading = crossfading;
unit->offset_start = offset_start;
unit->offset_current = offset_current;
unit->offset_timer = offset_timer;
unit->decaytime = decaytime;
unit->writepos = writepos;
unit->readpos = readpos;
unit->prev_samp = prev_samp;
}
void AverageOutput_Ctor( AverageOutput* unit ) {
unit->average = 0.;
unit->count = 0;
unit->prev_trig = 0.;
RGen& rgen = *unit->mParent->mRGen;
SETCALC(AverageOutput_next);
}
void AverageOutput_next( AverageOutput *unit, int inNumSamples ) {
int i;
float *in = IN(0);
float *out = ZOUT(0);
float trig = ZIN0(1);
float prev_trig = unit->prev_trig;
double average = unit->average;
uint32 count = unit->count;
if(prev_trig <= 0. && trig > 0.) {
average = 0.;
count = 0;
}
for (i=0; i<inNumSamples; ++i) {
average = ((count * average) + *(in+i)) / ++count;
ZXP(out) = average;
}
unit->prev_trig = trig;
unit->count = count;
unit->average = average;
}
extern "C" void load(InterfaceTable *inTable) {
ft = inTable;
DefineDtorUnit(SwitchDelay);
DefineSimpleUnit(AverageOutput);
}