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/*
dfx skidder : an effect plugin
Copyright (C) 2000, Marc Poirier
Copyright (C) 2002, martin pi
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
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*-------------- by Marc Poirier ][ December 2000 -------------*/
/* pd parts : © 2002, martin pi */
#ifndef __skidder
#include "skidder.hpp"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
//-----------------------------------------------------------------------------
// initializations & such
skidder::skidder(int argc, t_atom *argv) {
post("_ ____ ---- :: _______ ___ _____ _ skidder~ ");
tempoRateTable = new TempoRateTable;
// m_setup(); // initialize a fresh skid cycle
AddInSignal(2);
AddInFloat(6);
AddOutSignal(2);
SetupInOut();
fTempo = tempoUnscaled(120.0f);
currentTempoBPS = oldTempoBPS = tempoScaled(fTempo) / 60.0f;
FLEXT_ADDMETHOD( 1, setRate);
FLEXT_ADDMETHOD_F(0,"temposync",setTempoSync);
FLEXT_ADDMETHOD( 2, setTempoRate);
FLEXT_ADDMETHOD_F(0,"rrf",setRateRandFactor);
FLEXT_ADDMETHOD( 3, setTempo);
FLEXT_ADDMETHOD( 4, setPulsewidth);
FLEXT_ADDMETHOD_F(0,"pwrm",setPulsewidthRandMin);
FLEXT_ADDMETHOD( 5, setSlope);
FLEXT_ADDMETHOD( 6, setFloor);
FLEXT_ADDMETHOD_F(0,"frm",setFloorRandMin);
FLEXT_ADDMETHOD( 7, setPan);
FLEXT_ADDMETHOD_F(0,"noise",setNoise);
post("_ ____ ____ _");
srand((unsigned int)time(NULL)); // sets a seed value for rand() from the system clock
}
//-----------------------------------------------------------------------------------------
// titles of each parameter
void skidder::m_help() {
post(" __ ---- %s %f", "1 rate [ Hz ] ",fRate);
post(" __ ---- %s %f", "temposync tempo sync ",fTempoSync);
post(" __ ---- %s %f", "2 tempo rate [ cycles/beat ]",fTempoRate);
post(" __ ---- %s %f", "rrf rate random factor",fRateRandFactor);
post(" __ ---- %s %f", "3 tempo [ bpm ]",fTempo);
post(" __ ---- %s %f", "4 pulsewidth [ % of cycle ]",fPulsewidth);
post(" __ ---- %s %f", "pwrm pulsewidth random min. [ % of cycle ]",fPulsewidthRandMin);
post(" __ ---- %s %f", "5 slope [ ms ]",fSlope);
post(" __ ---- %s %f", "6 floor [ dB ]",fFloor);
post(" __ ---- %s %f", "frm floor random min. [ dB ]",fFloorRandMin);
post(" __ ---- %s %f", "7 stereo spread[ amount ]",fPan);
post(" __ ---- %s %f", "noise rupture ",fNoise);
}
// GIMME class:
FLEXT_NEW_TILDE_G("skidder~", skidder)
void skidder::m_signal(int n, float *const *in, float *const *out) {
// directly move everything to the vst part
processReplacing((float **)in, (float **)out,(long)n, true);
} // end m_signal
//-----------------------------------------------------------------------------------------
// this gets called when the plugin is de-activated
void skidder::m_setup() {
state = valley;
valleySamples = 0;
panRander = 0.0f;
rms = 0.0f;
rmscount = 0;
randomFloor = 0.0f;
randomGainRange = 1.0f;
// deallocate the memory from these arrays
// if (tempoRateTable) delete tempoRateTable;
fRate = rateUnscaled(3.0f); // 0.1304347826087
fTempoSync = 0.0f; // default to no tempo sync; "free" control
fTempoRate = 0.333f;
fRateRandFactor = 0.0f; // default to no randomness
fTempo = 0.0f; // default to "auto" (i.e. get it from the host)
fPulsewidth = 0.5f;
fPulsewidthRandMin = 0.5f;
fSlope = 3.0f/SLOPEMAX; // 0.2
fFloor = 0.0f;
fFloorRandMin = 0.0f;
fPan = 0.0f;
fNoise = 0.0f;
}
//-----------------------------------------------------------------------------------------
void skidder::processSlopeIn()
{
// dividing the growing slopeDur-slopeSamples by slopeDur makes ascending values
if (useRandomFloor)
amp = ( ((float)(slopeDur-slopeSamples)) * slopeStep * randomGainRange ) + randomFloor;
else
amp = ( ((float)(slopeDur-slopeSamples)) * slopeStep * gainRange ) + floor;
slopeSamples--;
if (slopeSamples <= 0)
{
state = plateau;
}
}
//-----------------------------------------------------------------------------------------
void skidder::processPlateau()
{
// amp in the plateau is 1.0, i.e. this sample is unaffected
amp = 1.0f;
plateauSamples--;
if (plateauSamples <= 0)
{
// average & then sqare the sample squareroots for the RMS value
rms = powf((rms/(float)rmscount), 2.0f);
// because RMS tends to be < 0.5, thus unfairly limiting rupture's range
rms *= 2.0f;
// avoids clipping or unexpected values (like wraparound)
if ( (rms > 1.0f) || (rms < 0.0f) )
rms = 1.0f;
rmscount = 0; // reset the RMS counter
//
// set up the random floor values
useRandomFloor = fFloorRandMin < fFloor;
randomFloor = ( ((float)rand()*ONE_DIV_RAND_MAX) * gainScaled(fFloor-fFloorRandMin) )
+ gainScaled(fFloorRandMin);
randomGainRange = 1.0f - randomFloor; // the range of the skidding on/off gain
//
if (slopeDur > 0)
{
state = slopeOut;
slopeSamples = slopeDur; // refill slopeSamples
slopeStep = 1.0f / (float)slopeDur; // calculate the fade increment scalar
}
else
state = valley;
}
}
//-----------------------------------------------------------------------------------------
void skidder::processSlopeOut()
{
// dividing the decrementing slopeSamples by slopeDur makes descending values
if (useRandomFloor)
amp = ( ((float)slopeSamples) * slopeStep * randomGainRange ) + randomFloor;
else
amp = ( ((float)slopeSamples) * slopeStep * gainRange ) + floor;
slopeSamples--;
if (slopeSamples <= 0)
{
state = valley;
}
}
//-----------------------------------------------------------------------------------------
void skidder::processValley(float SAMPLERATE)
{
float rateRandFactor = rateRandFactorScaled(fRateRandFactor); // stores the real value
float cycleRate; // the base current skid rate value
float randFloat, randomRate; // the current randomized rate value
float fPulsewidthRandomized; // stores the latest randomized pulsewidth 0.0 - 1.0 value
bool barSync = false; // true if we need to sync up with the next bar start
long countdown;
if (useRandomFloor)
amp = randomFloor;
else
amp = floor;
valleySamples--;
if (valleySamples <= 0)
{
rms = 0.0f; // reset rms now because valley is over
//
// This is where we figure out how many samples long each
// envelope section is for the next skid cycle.
//
if (onOffTest(fTempoSync)) // the user wants to do tempo sync / beat division rate
{
cycleRate = currentTempoBPS * (tempoRateTable->getScalar(fTempoRate));
// set this true so that we make sure to do the measure syncronisation later on
}
else
cycleRate = rateScaled(fRate);
//
if (fRateRandFactor > 0.0f)
{
// get a random value from 0.0 to 1.0
randFloat = (float)rand() * ONE_DIV_RAND_MAX;
// square-scale the random value & then scale it with the random rate range
randomRate = ( randFloat * randFloat *
((cycleRate*rateRandFactor)-(cycleRate/rateRandFactor)) ) +
(cycleRate/rateRandFactor);
cycleSamples = (long) (SAMPLERATE / randomRate);
barSync = false; // we can't do the bar sync if the skids durations are random
}
else
cycleSamples = (long) (SAMPLERATE / cycleRate);
//
if (fPulsewidth > fPulsewidthRandMin)
{
fPulsewidthRandomized = ( ((float)rand()*ONE_DIV_RAND_MAX) * (fPulsewidth-fPulsewidthRandMin) ) + fPulsewidthRandMin;
pulseSamples = (long) ( ((float)cycleSamples) * pulsewidthScaled(fPulsewidthRandomized) );
}
else
pulseSamples = (long) ( ((float)cycleSamples) * pulsewidthScaled(fPulsewidth) );
valleySamples = cycleSamples - pulseSamples;
slopeSamples = (long) ((SAMPLERATE/1000.0f)*(fSlope*(SLOPEMAX)));
slopeDur = slopeSamples;
slopeStep = 1.0f / (float)slopeDur; // calculate the fade increment scalar
plateauSamples = pulseSamples - (slopeSamples * 2);
if (plateauSamples < 1) // this shrinks the slope to 1/3 of the pulse if the user sets slope too high
{
slopeSamples = (long) (((float)pulseSamples) / 3.0f);
slopeDur = slopeSamples;
slopeStep = 1.0f / (float)slopeDur; // calculate the fade increment scalar
plateauSamples = pulseSamples - (slopeSamples * 2);
}
// go to slopeIn next if slope is not 0.0, otherwise go to plateau
if (slopeDur > 0)
state = slopeIn;
else
state = plateau;
// this puts random float values from -1.0 to 1.0 into panRander
panRander = ( ((float)rand()*ONE_DIV_RAND_MAX) * 2.0f ) - 1.0f;
} //end of the "valley is over" if-statement
}
//-----------------------------------------------------------------------------------------
float skidder::processOutput(float in1, float in2, float pan)
{
// output noise
if ( (state == valley) && (fNoise != 0.0f) )
// out gets random noise with samples from -1.0 to 1.0 times the random pan times rupture times the RMS scalar
return ((((float)rand()*ONE_DIV_RAND_MAX)*2.0f)-1.0f) * pan * fNoise_squared * rms;
// do regular skidding output
else
{
// only output a bit of the first input
if (pan <= 1.0f)
return in1 * pan * amp;
// output all of the first input & a bit of the second input
else
return ( in1 + (in2*(pan-1.0f)) ) * amp;
}
}
//-----------------------------------------------------------------------------------------
void skidder::processReplacing(float **inputs, float **outputs, long sampleFrames, bool replacing) {
float *in1 = inputs[0];
float *in2 = inputs[1];
float *out1 = outputs[0];
float *out2 = outputs[1];
float SAMPLERATE = Samplerate();
// just in case the host responds with something wacky
if (SAMPLERATE <= 0.0f) SAMPLERATE = 44100.0f;
long samplecount;
floor = gainScaled(fFloor); // the parameter scaled real value
gainRange = 1.0f - floor; // the range of the skidding on/off gain
useRandomFloor = (fFloorRandMin < fFloor);
// figure out the current tempo if we're doing tempo sync
if (onOffTest(fTempoSync))
{
// calculate the tempo at the current processing buffer
currentTempoBPS = tempoScaled(fTempo) / 60.0f;
}
for (samplecount=0; (samplecount < sampleFrames); samplecount++)
{
switch (state)
{
case slopeIn:
// get the average sqareroot of the current input samples
rms += sqrtf( fabsf(((*in1)+(*in2))*0.5f) );
rmscount++; // this counter is later used for getting the mean
processSlopeIn();
break;
case plateau:
rms += sqrtf( fabsf(((*in1)+(*in2))*0.5f) );
rmscount++;
processPlateau();
break;
case slopeOut:
processSlopeOut();
break;
case valley:
processValley(SAMPLERATE);
break;
}
// ((panRander*fPan)+1.0) ranges from 0.0 to 2.0
if (replacing)
{
*out1 = processOutput( *in1, *in2, ((panRander*fPan)+1.0f) );
*out2 = processOutput( *in2, *in1, (2.0f - ((panRander*fPan)+1.0f)) );
}
else
{
*out1 += processOutput( *in1, *in2, ((panRander*fPan)+1.0f) );
*out2 += processOutput( *in2, *in1, (2.0f - ((panRander*fPan)+1.0f)) );
}
// move forward in the i/o sample streams
in1++;
in2++;
out1++;
out2++;
}
}
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