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/*
Rakarrack Audio FX
Dual_Flange.C - Super Flanger
Copyright (C) 2010 Ryan Billing
Authors:
Ryan Billing (a.k.a Transmogrifox) -- Signal Processing
Copyright (C) 2010 Ryan Billing
Nasca Octavian Paul -- Remnants of ZynAddSubFX Echo.h structure and utility routines common to ZynSubFX source
Copyright (C) 2002-2005 Nasca Octavian Paul
Higher intensity flanging accomplished by picking two points out of the delay line to create a wider notch filter.
This program is free software; you can redistribute it and/or modify
it under the terms of version 2 of the GNU General Public License
as published by the Free Software Foundation.
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 (version 2) for more details.
You should have received a copy of the GNU General Public License (version 2)
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "Dual_Flange.h"
Dflange::Dflange (float * efxoutl_, float * efxoutr_)
{
efxoutl = efxoutl_;
efxoutr = efxoutr_;
period_const = 1.0f/fPERIOD;
//default values
Ppreset = 0;
ldelay = NULL;
rdelay = NULL;
maxx_delay = (int) SAMPLE_RATE * D_FLANGE_MAX_DELAY;
ldelay = new float[maxx_delay];
rdelay = new float[maxx_delay];
zldelay = new float[maxx_delay];
zrdelay = new float[maxx_delay];
fsubtract = 0.5f;
fhidamp = 1.0f;
fwidth = 800;
fdepth = 50;
zcenter = (int) floorf(0.5f * (fdepth + fwidth));
base = 7.0f; //sets curve of modulation to frequency relationship
ibase = 1.0f/base;
//default values
Ppreset = 0;
rsA = 0.0f;
rsB = 0.0f;
lsA = 0.0f;
lsB = 0.0f;
setpreset (Ppreset);
cleanup ();
};
Dflange::~Dflange ()
{
};
/*
* Cleanup the effect
*/
void
Dflange::cleanup ()
{
int i;
for (i = 0; i < maxx_delay; i++)
{
ldelay[i] = 0.0;
rdelay[i] = 0.0;
zldelay[i] = 0.0;
zrdelay[i] = 0.0;
};
//loop variables
l = 0.0f;
r = 0.0f;
ldl = 0.0f;
rdl = 0.0f;
rflange0 = 0.0f;
lflange0 = 0.0f;
rflange1 = 0.0f;
lflange1 = 0.0f;
};
/*
* Effect output
*/
void
Dflange::out (float * smpsl, float * smpsr)
{
int i;
//deal with LFO's
int tmp0, tmp1;
float lfol, lfor, lmod, rmod, lmodfreq, rmodfreq, rx0, rx1, lx0, lx1;
float ldif0, ldif1, rdif0, rdif1; //Difference between fractional delay and floor(fractional delay)
float drA, drB, dlA, dlB; //LFO inside the loop.
lfo.effectlfoout (&lfol, &lfor);
lmod = lfol;
rmod = lfor;
// lmod = (powf (2.0f, lmod*LOG_FMAX) - 1.0f) * LFO_CONSTANT; //2^x type sweep for musical interpretation of moving delay line.
// rmod = (powf (2.0f, rmod*LOG_FMAX) - 1.0f) * LFO_CONSTANT;
lmodfreq = fdepth + fwidth*(powf(base, lmod) - 1.0f)*ibase; //sets frequency of lowest notch. // 20 <= fdepth <= 4000 // 20 <= width <= 16000 //
rmodfreq = fdepth + fwidth*(powf(base, rmod) - 1.0f)*ibase;
if (lmodfreq > 10000.0f)
lmodfreq = 10000.0f;
else if (lmodfreq < 10.0f)
lmodfreq = 10.0f;
if (rmodfreq > 10000.0)
rmodfreq = 10000.0f;
else if (rmodfreq < 10.0f)
rmodfreq = 10.0f;
rflange0 = fSAMPLE_RATE * 0.5f/rmodfreq; //Turn the notch frequency into a number for delay
rflange1 = rflange0 * foffset; //Set relationship of second delay line
lflange0 = fSAMPLE_RATE * 0.5f/lmodfreq;
lflange1 = lflange0 * foffset;
//now is a delay expressed in number of samples. Number here
//will be fractional, but will use linear interpolation inside the loop to make a decent guess at
//the numbers between samples.
rx0 = (rflange0 - oldrflange0) * period_const; //amount to add each time around the loop. Less processing of linear LFO interp inside the loop.
rx1 = (rflange1 - oldrflange1) * period_const;
lx0 = (lflange0 - oldlflange0) * period_const;
lx1 = (lflange1 - oldlflange1) * period_const;
// Now there is a fractional amount to add
drA = oldrflange0;
drB = oldrflange1;
dlA = oldlflange0;
dlB = oldlflange1;
// dr, dl variables are the LFO inside the loop.
oldrflange0 = rflange0;
oldrflange1 = rflange1;
oldlflange0 = lflange0;
oldlflange1 = lflange1;
//lfo ready...
for (i = 0; i < PERIOD; i++)
{
//Delay line utility
ldl = ldelay[kl];
rdl = rdelay[kr];
l = ldl * flrcross + rdl * frlcross;
r = rdl * flrcross + ldl * frlcross;
ldl = l;
rdl = r;
ldl = smpsl[i] * lpan - ldl * ffb;
rdl = smpsr[i] * rpan - rdl * ffb;
//LowPass Filter
ldelay[kl] = ldl = ldl * (1.0f - fhidamp) + oldl * fhidamp;
rdelay[kr] = rdl = rdl * (1.0f - fhidamp) + oldr * fhidamp;
oldl = ldl + DENORMAL_GUARD;
oldr = rdl + DENORMAL_GUARD;
if(Pzero)
{
//Offset zero reference delay
zdl = zldelay[zl];
zdr = zrdelay[zr];
zldelay[zl] = smpsl[i];
zrdelay[zr] = smpsr[i];
if (--zl < 0) //Cycle delay buffer in reverse so delay time can be indexed directly with addition
zl = zcenter;
if (--zr < 0)
zr = zcenter;
}
//End delay line management, start flanging:
//Right Channel, delay A
rdif0 = drA - floor(drA);
tmp0 = (kr + (int) floor(drA)) % maxx_delay;
tmp1 = tmp0 + 1;
if (tmp1 >= maxx_delay) tmp1 = 0;
//rsA = rdelay[tmp0] + rdif0 * (rdelay[tmp1] - rdelay[tmp0] ); //here is the first right channel delay
rsA = rdelay[tmp1] + rdif0 * (rdelay[tmp0] - rsA ); //All-pass interpolator
//Right Channel, delay B
rdif1 = drB - floor(drB);
tmp0 = (kr + (int) floor(drB)) % maxx_delay;
tmp1 = tmp0 + 1;
if (tmp1 >= maxx_delay) tmp1 = 0;
//rsB = rdelay[tmp0] + rdif1 * (rdelay[tmp1] - rdelay[tmp0]); //here is the second right channel delay
rsB = rdelay[tmp1] + rdif1 * (rdelay[tmp0] - rsB );
//Left Channel, delay A
ldif0 = dlA - floor(dlA);
tmp0 = (kl + (int) floor(dlA)) % maxx_delay;
tmp1 = tmp0 + 1;
if (tmp1 >= maxx_delay) tmp1 = 0;
//lsA = ldelay[tmp0] + ldif0 * (ldelay[tmp1] - ldelay[tmp0]); //here is the first left channel delay
lsA = ldelay[tmp1] + ldif0 * (ldelay[tmp0] - lsA );
//Left Channel, delay B
ldif1 = dlB - floor(dlB);
tmp0 = (kl + (int) floor(dlB)) % maxx_delay;
tmp1 = tmp0 + 1;
if (tmp1 >= maxx_delay) tmp1 = 0;
//lsB = ldelay[tmp0] + ldif1 * (ldelay[tmp1] - ldelay[tmp0]); //here is the second leftt channel delay
lsB = ldelay[tmp1] + ldif1 * (ldelay[tmp0] - lsB );
//End flanging, next process outputs
if(Pzero)
{
efxoutl[i]= dry * smpsl[i] + fsubtract * wet * (fsubtract * (lsA + lsB) + zdl); // Make final FX out mix
efxoutr[i]= dry * smpsr[i] + fsubtract * wet * (fsubtract * (rsA + rsB) + zdr);
}
else
{
efxoutl[i]= dry * smpsl[i] + wet * fsubtract * (lsA + lsB); // Make final FX out mix
efxoutr[i]= dry * smpsr[i] + wet * fsubtract * (rsA + rsB);
}
if (--kl < 0) //Cycle delay buffer in reverse so delay time can be indexed directly with addition
kl = maxx_delay;
if (--kr < 0)
kr = maxx_delay;
// Increment LFO
drA += rx0;
drB += rx1;
dlA += lx0;
dlB += lx1;
};
};
/*
* Parameter control
*/
void
Dflange::changepar (int npar, int value)
{
switch (npar)
{
case 0:
Pwetdry = value;
dry = (float) (Pwetdry+64) /128.0f;
wet = 1.0f - dry;
break;
case 1:
Ppanning = value;
if (value < 0)
{
rpan = 1.0f + (float) Ppanning/64.0;
lpan = 1.0f;
}
else
{
lpan = 1.0f - (float) Ppanning/64.0;
rpan = 1.0f;
};
break;
case 2:
Plrcross = value;
flrcross = (float) Plrcross/127.0;
frlcross = 1.0f - flrcross; //keep this out of the DSP loop
break;
case 3:
Pdepth = value;
fdepth = (float) Pdepth;
zcenter = (int) floor(0.5f * (fdepth + fwidth));
break;
case 4:
Pwidth = value;
fwidth = (float) Pwidth;
zcenter = (int) floor(0.5f * (fdepth + fwidth));
break;
case 5:
Poffset = value;
foffset = 0.5f + (float) Poffset/255.0;
break;
case 6:
Pfb = value;
ffb = (float) Pfb/64.5f;
break;
case 7:
Phidamp = value;
fhidamp = expf(-D_PI * (float) Phidamp/fSAMPLE_RATE);
break;
case 8:
Psubtract = value;
fsubtract = 0.5f;
if(Psubtract) fsubtract = -0.5f; //In loop a mult by 0.5f is necessary, so this kills 2 birds with 1...
break;
case 9:
Pzero = value;
if (Pzero) fzero = 1.0f;
break;
case 10:
lfo.Pfreq = value;
lfo.updateparams ();
break;
case 11:
lfo.Pstereo = value;
lfo.updateparams ();
break;
case 12:
lfo.PLFOtype = value;
lfo.updateparams ();
break;
case 13:
lfo.Prandomness = value;
lfo.updateparams ();
break;
};
};
int
Dflange::getpar (int npar)
{
switch (npar)
{
case 0:
return (Pwetdry);
break;
case 1:
return (Ppanning);
break;
case 2:
return (Plrcross);
break;
case 3:
return (Pdepth);
break;
case 4:
return (Pwidth);
break;
case 5:
return (Poffset);
break;
case 6:
return (Pfb);
break;
case 7:
return (Phidamp);
break;
case 8:
return (Psubtract);
break;
case 9:
return (Pzero);
break;
case 10:
return (lfo.Pfreq);
break;
case 11:
return (lfo.Pstereo);
break;
case 12:
return (lfo.PLFOtype);
break;
case 13:
return (lfo.Prandomness);
break;
};
return (0); //in case of bogus parameter number
};
void
Dflange::setpreset (int npreset)
{
const int PRESET_SIZE = 14;
const int NUM_PRESETS = 9;
int presets[NUM_PRESETS][PRESET_SIZE] = {
//Preset 1
{-32, 0, 0, 110, 800, 10, -27, 16000, 1, 0, 24, 64, 1, 10},
//Flange-Wha
{0, 0, 64, 500, 3000, 50, -40, 8000, 1, 0, 196, 96, 0, 0},
//FbFlange
{0, 0, 64, 68, 75, 50, -50, 8000, 0, 1, 23, 96, 5, 0},
//SoftFlange
{-32, 0, 64, 60, 10, 100, 20, 16000, 0, 0, 16, 90, 4, 0},
//Flanger
{-32, 0, 64, 170, 1200, 50, 0, 16000, 1, 0, 68, 127, 0, 0},
//Chorus 1
{-15, 0, 0, 42, 12, 50, -10, 1500, 0, 0, 120, 0, 0, 20},
//Chorus 2
{-40, 0, 0, 35, 9, 67, 12, 4700, 1, 1, 160, 75, 0, 60},
//Preset 8
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
//Preset 9
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
};
if(npreset>NUM_PRESETS-1)
{
Fpre->ReadPreset(20,npreset-NUM_PRESETS+1);
for (int n = 0; n < PRESET_SIZE; n++)
changepar (n, pdata[n]);
}
else
{
for (int n = 0; n < PRESET_SIZE; n++)
changepar (n, presets[npreset][n]);
}
Ppreset = npreset;
};
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