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