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BerlachUGens.cpp
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BerlachUGens.cpp
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#include <SC_PlugIn.h>
#include <SC_InterfaceTable.h>
#include <math.h>
#include <stdio.h>
#include "sinctab.h"
#include "Oversamp.h"
// number of poles and zeros for the variable slope filter
#define npoles 4
#define nzeros 4
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
static inline float bilinear(float p)
{
return ((2.f+p)/(2.f-p));
}
static inline float tanapprox (float x)
{
return x*(x*(x*(0.96369f*x-0.865157f)+0.53576f)+0.93f);
}
static InterfaceTable *ft;
struct PeakEQ4 : public Unit
{
double m_a[8];
double m_b[10];
double m_mem[10];
float freq, width, gain;
};
struct PeakEQ2 : public Unit
{
double m_mem[4];
double m_a[4];
double m_b[5];
float freq, width, gain;
};
/* ************************************************************************ */
/* ***** Josep Comajuncosas' 18dB/oct resonant 3-pole LPF with tanh dist ** */
/* ***** Coded in C by John ffitch, 2000 Dec 17 *************************** */
/* ************************************************************************ */
/* ported to SuperCollider by Bjoern Erlach. 2008 */
struct LPF18 : public Unit
{
float ay1, ay2, lastin, aout;
float kp, kres, last_fco, m_value;
};
/* LPFVS.cpp
Copyright (C) 2007 by Bjoern Erlach. */
/* Contains a variable slope lowpass filter with slope adjustable from 0-6db and
a simple one pole lowpass (LPF1). */
struct LPF1 : public Unit
{
float m_y1;
float p;
float last_freq;
};
struct LPFVS6 : public Unit
{
float mem[npoles]; // memory for the delay lines
float a[npoles]; // coefficients for the feedforward part
float b[npoles+1]; // coefficients for the feedforward part
float norm; // gain normalization
float last_slope; // slope
float last_freq; // cutoff frequency
};
/* BLBufRd.cpp
Copyright (C) 2007 by Bjoern Erlach. */
struct BLBufRd : public Unit
{
SndBuf *m_buf;
float m_fbufnum;
};
/* OSNonlinear.cpp
Copyright (C) 2006 by Bjoern Erlach. */
struct OSWrap4 : public Oversamp4 {};
struct OSWrap8 : public Oversamp8 {};
struct OSFold4 : public Oversamp4 {};
struct OSFold8 : public Oversamp8 {};
struct OSTrunc4 : public Oversamp4 {};
struct OSTrunc8 : public Oversamp8 {};
struct Clipper8 : public Oversamp8 {};
struct Clipper4 : public Oversamp4 {};
struct SoftClipper8 : public Oversamp8 {};
struct SoftClipper4 : public Oversamp4 {};
struct SoftClipAmp8 : public Oversamp8 {};
struct SoftClipAmp4 : public Oversamp4 {};
struct DriveNoise : public Unit {};
extern "C" {
void PeakEQ4_Ctor(PeakEQ4 *unit);
void PeakEQ4_next(PeakEQ4 *unit, int inNumSamples);
void PeakEQ2_Ctor(PeakEQ2 *unit);
void PeakEQ2_next(PeakEQ2 *unit, int inNumSamples);
void LPF18_Ctor(LPF18 *unit);
void LPF18_next(LPF18 *unit, int inNumSamples);
void LPF1_Ctor(LPF1 *unit);
void LPF1_next(LPF1 *unit, int inNumSamples);
void LPF1_next_a(LPF1 *unit, int inNumSamples);
void LPFVS6_Ctor(LPFVS6 *unit);
void LPFVS6_next(LPFVS6 *unit, int inNumSamples);
void LPF1_Ctor(LPF1 *unit);
void LPF1_next(LPF1 *unit, int inNumSamples);
void LPF1_next_a(LPF1 *unit, int inNumSamples);
void BLBufRd_Ctor(BLBufRd *unit);
void BLBufRd_next(BLBufRd *unit, int inNumSamples);
void OSWrap8_Ctor(OSWrap8 *unit);
void OSWrap8_next(OSWrap8 *unit, int inNumSamples);
void OSWrap4_Ctor(OSWrap4 *unit);
void OSWrap4_next(OSWrap4 *unit, int inNumSamples);
void OSFold4_Ctor(OSFold4 *unit);
void OSFold4_next(OSFold4 *unit, int inNumSamples);
void OSFold8_Ctor(OSFold8 *unit);
void OSFold8_next(OSFold8 *unit, int inNumSamples);
void OSTrunc4_Ctor(OSTrunc4 *unit);
void OSTrunc4_next(OSTrunc4 *unit, int inNumSamples);
void OSTrunc8_Ctor(OSTrunc8 *unit);
void OSTrunc8_next(OSTrunc8 *unit, int inNumSamples);
void Clipper8_Ctor(Clipper8 *unit);
void Clipper8_next(Clipper8 *unit, int inNumSamples);
void Clipper4_Ctor(Clipper4 *unit);
void Clipper4_next(Clipper4 *unit, int inNumSamples);
void SoftClipper8_Ctor(SoftClipper8 *unit);
void SoftClipper8_next(SoftClipper8 *unit, int inNumSamples);
void SoftClipper4_Ctor(SoftClipper4 *unit);
void SoftClipper4_next(SoftClipper4 *unit, int inNumSamples);
void SoftClipAmp8_Ctor(SoftClipAmp8 *unit);
void SoftClipAmp8_next(SoftClipAmp8 *unit, int inNumSamples);
void SoftClipAmp4_Ctor(SoftClipAmp4 *unit);
void SoftClipAmp4_next(SoftClipAmp4 *unit, int inNumSamples);
void DriveNoise_Ctor(DriveNoise *unit);
void DriveNoise_next(DriveNoise *unit, int inNumSamples);
}
// macros to put rgen state in registers
#define RGET \
RGen& rgen = *unit->mParent->mRGen; \
uint32 s1 = rgen.s1; \
uint32 s2 = rgen.s2; \
uint32 s3 = rgen.s3;
#define RPUT \
rgen.s1 = s1; \
rgen.s2 = s2; \
rgen.s3 = s3;
#define G0 1.f
#define exp10f(x) expf((x)*2.30258509299404590109361f)
#define exp10(x) exp((x)*2.30258509299404590109361)
static inline void calc_coeffs4 (double *bcoeff, double *acoeff, double w0, double Dw, double gain)
{
double G = exp10f(gain/20.f);
// bandwidth gain is set to half gain
double GB = exp10f(gain/40.f);
double c0 = cosf(w0);
double WB = tanf(Dw/2);
double e = sqrtf((G*G-GB*GB)/(GB*GB-1.f));
double g = powf(G, 0.25f);
double a = powf(e, 0.25f);
#define si1 0.382683432365089781779f;
#define si2 0.923879532511286738483f;
//Ba(1+i,:) = [g^2*WB^2*v, 2*g*b*si*WB, b^2*v]
//Aa(1+i,:) = [WB^2*v, 2*a*si*WB, a^2*v]
double Aa0 = WB*WB;
double Aatmp = 2*a*WB;
double Aa10 = Aatmp * si1;
double Aa11 = Aatmp * si2;
double as = a*a;
double Ba0 = Aa0 * g*g;
double Batmp = 2*g * a * WB;
double Ba10 = Batmp * si1;
double Ba11 = Batmp * si2;
// fprintf(stdout, "%f %f %f %f %f %f %f\n", Aa0, Aa10, Aa11, Ba0, Ba10, Ba11, as);
// double Bhat0 = Ba0/Aa0;
// D = A0(i)+A1(i)+A2(i)
double D1 = Aa0+Aa11+as;
double D0 = Aa0+Aa10+as;
//Bhat(i,1) = (B0(i)+B1(i)+B2(i))./D
//(B0(i)+B1(i)+B2(i))./D
double tmp = Ba0+as;
double x;
double Bhat00 = (Ba10+tmp)/D0;
double Bhat01 = (Ba11+tmp)/D1;
x=2.f*(Ba0-as);
double Bhat10 = x/D0;
double Bhat11 = x/D1;
double Bhat20 = (tmp-Ba10)/D0;
double Bhat21 = (tmp-Ba11)/D1;
//Ahat(i,1) = 1
//Ahat(i,2) = 2*(A0(i)-A2(i))./D
//Ahat(i,3) = (A0(i)-A1(i)+A2(i))./D
x = 2.f*(Aa0-as);
double Ahat10 = x/D0;
double Ahat11 = x/D1;
double Ahat20 = (Aa0-Aa10+as)/D0;
double Ahat21 = (Aa0-Aa11+as)/D1;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f\n\n",Bhat00, Bhat01, Bhat10, Bhat11, Bhat21, Ahat11, Ahat10, Ahat20, Ahat21);
// B(i,2) = c0*(Bhat(i,2)-2*Bhat(i,1))
bcoeff[0] = Bhat00;
bcoeff[5] = Bhat01;
bcoeff[1] = c0*(Bhat10-2.f*Bhat00);
bcoeff[6] = c0*(Bhat11-2.f*Bhat01);
bcoeff[2] = (Bhat00-Bhat10+Bhat20)*c0*c0- Bhat10;
bcoeff[7] = (Bhat01-Bhat11+Bhat21)*c0*c0 - Bhat11;
bcoeff[3] = c0*(Bhat10-2.f*Bhat20);
bcoeff[8] = c0*(Bhat11-2.f*Bhat21);
bcoeff[4] = Bhat20;
bcoeff[9] = Bhat21;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f %f\n", Bres00, Bres10, Bres20, Bres30, Bres40, Bres01, Bres11, Bres21, Bres31, Bres41);
acoeff[0]= c0*(Ahat10-2.f);
acoeff[4]= c0*(Ahat11-2.f);
acoeff[1]= (1.f-Ahat10+Ahat20)*c0*c0 - Ahat10;
acoeff[5]= (1.f-Ahat11+Ahat21)*c0*c0- Ahat11;
acoeff[2]= c0*(Ahat10-2.f*Ahat20);
acoeff[6]= c0*(Ahat11-2.f*Ahat21);
acoeff[3]= Ahat20;
acoeff[7]= Ahat21;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f %f\n", Ares00, Ares10, Ares20, Ares30, Ares40, Ares01, Ares11, Ares21, Ares31, Ares41);
}
void PeakEQ4_Ctor(PeakEQ4* unit)
{
// force coeff calculation
unit->freq = -1.1;
memset(unit->m_mem, 0, sizeof(double)*10);
memset(unit->m_b, 0, sizeof(double)*10);
memset(unit->m_a, 0, sizeof(double)*8);
SETCALC(PeakEQ4_next);
}
void PeakEQ4_next(PeakEQ4* unit, int inNumSamples)
{
float *out = ZOUT(0);
float *input = ZIN(0);
float freq = ZIN0(1);
float width = ZIN0(2);
float gain = ZIN0(3);
double *bc = unit->m_b;
double *ac = unit->m_a;
double *buf = unit->m_mem;
if ((unit->freq!=freq)||(unit->gain!=gain)||(unit->width!=width)) {
double w0 = freq * 2*M_PI / SAMPLERATE;
double Dw = w0 * width;
calc_coeffs4(bc,ac,w0, Dw, gain);
}
LOOP(inNumSamples,
double in = (double) ZXP(input);
double iir;
double iir2;
double fir;
iir= in-
ac[0]*buf[3]-
ac[1]*buf[2]-
ac[2]*buf[1]-
ac[3]*buf[0];
fir= bc[0]*iir+
bc[1]*buf[3]+
bc[2]*buf[2]+
bc[3]*buf[1]+
bc[4]*buf[0];
iir2= fir-
ac[4]*buf[7]-
ac[5]*buf[6]-
ac[6]*buf[5]-
ac[7]*buf[4];
fir= bc[5]*iir2+
bc[6]*buf[7]+
bc[7]*buf[6]+
bc[8]*buf[5]+
bc[9]*buf[4];
memmove(buf, buf+1, 7*sizeof(double));
buf[3]= iir;
buf[7]= iir2;
ZXP(out) = (float)fir;
)
}
////////////////////////////////////////////////////////////////////////////
static inline void calc_coeffs2 (double *bcoeff, double *acoeff, double w0, double Dw, double gain)
{
double G = exp10(((double)gain)/20);
// bandwidth gain is set to half gain
double GB = exp10(((double)gain)/40);
double c0 = cos(w0);
double WB = tan(((double)Dw)/2);
double e = sqrt((G*G-GB*GB)/(GB*GB-1.0));
double g = pow(G, 0.5);
double a = pow(e, 0.5);
#define si 0.70710678118654748
//Ba(1+i,:) = [g^2*WB^2*v, 2*g*b*si*WB, b^2*v]
//Aa(1+i,:) = [WB^2*v, 2*a*si*WB, a^2*v]
double Aa0 = WB*WB;
double Aatmp = 2*a*WB;
double Aa10 = Aatmp * si;
double as = a*a;
double Ba0 = Aa0 * g*g;
double Batmp = 2*g * a * WB;
double Ba10 = Batmp * si;
// fprintf(stdout, "%f %f %f %f %f %f %f\n", Aa0, Aa10, Aa11, Ba0, Ba10, Ba11, as);
// double Bhat0 = Ba0/Aa0;
// D = A0(i)+A1(i)+A2(i)
double D0 = Aa0+Aa10+as;
//Bhat(i,1) = (B0(i)+B1(i)+B2(i))./D
//(B0(i)+B1(i)+B2(i))./D
double tmp = Ba0+as;
double x;
double Bhat00 = (Ba10+tmp)/D0;
x=2.f*(Ba0-as);
double Bhat10 = x/D0;
double Bhat20 = (tmp-Ba10)/D0;
//Ahat(i,1) = 1
//Ahat(i,2) = 2*(A0(i)-A2(i))./D
//Ahat(i,3) = (A0(i)-A1(i)+A2(i))./D
x = 2.f*(Aa0-as);
double Ahat10 = x/D0;
double Ahat20 = (Aa0-Aa10+as)/D0;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f\n\n",Bhat00, Bhat01, Bhat10, Bhat11, Bhat21, Ahat11, Ahat10, Ahat20, Ahat21);
// B(i,2) = c0*(Bhat(i,2)-2*Bhat(i,1))
bcoeff[0] = (double) Bhat00;
bcoeff[1] = (double) (c0*(Bhat10-2.f*Bhat00));
bcoeff[2] = (double) ((Bhat00-Bhat10+Bhat20)*c0*c0- Bhat10);
bcoeff[3] = (double) (c0*(Bhat10-2.f*Bhat20));
bcoeff[4] = (double) Bhat20;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f %f\n", Bres00, Bres10, Bres20, Bres30, Bres40, Bres01, Bres11, Bres21, Bres31, Bres41);
acoeff[0]= (double) (c0*(Ahat10-2.f));
acoeff[1]= (double) ((1.f-Ahat10+Ahat20)*c0*c0 - Ahat10);
acoeff[2]= (double) (c0*(Ahat10-2.f*Ahat20));
acoeff[3]= (double) Ahat20;
// fprintf(stdout, "%f %f %f %f %f\n %f %f %f %f %f\n", Ares00, Ares10, Ares20, Ares30, Ares40, Ares01, Ares11, Ares21, Ares31, Ares41);
}
void PeakEQ2_Ctor(PeakEQ2* unit)
{
// force coeff calculation
unit->freq = -1.1;
memset(unit->m_mem, 0, sizeof(double)*4);
memset(unit->m_b, 0, sizeof(double)*5);
memset(unit->m_a, 0, sizeof(double)*4);
SETCALC(PeakEQ2_next);
}
void PeakEQ2_next(PeakEQ2* unit, int inNumSamples)
{
float *out = ZOUT(0);
float *input = ZIN(0);
float freq = ZIN0(1);
float width = ZIN0(2);
float gain = ZIN0(3);
double *bc = unit->m_b;
double *ac = unit->m_a;
double *buf = unit->m_mem;
if ((unit->freq!=freq)||(unit->gain!=gain)||(unit->width!=width)) {
double w0 = freq * 2*M_PI / SAMPLERATE;
double Dw = w0 * width;
calc_coeffs2(bc,ac,w0, Dw, gain);
}
LOOP(inNumSamples,
double in = (double) ZXP(input);
double iir;
double fir;
iir= in-
ac[0]*buf[3]-
ac[1]*buf[2]-
ac[2]*buf[1]-
ac[3]*buf[0];
fir= bc[0]*iir+
bc[1]*buf[3]+
bc[2]*buf[2]+
bc[3]*buf[1]+
bc[4]*buf[0];
memmove(buf, buf+1, 3*sizeof(double));
buf[3]= iir;
ZXP(out) = (float)fir;
)
}
#define SIGN(x) (x>=0.f?1.f:-1.f)
static inline float tanhapprox (float x) {
if (fabsf(x) > 1.691976516634051019849f) {
return SIGN(x) * 0.811728001858655012768f + x * 0.068523721733649733956f;
} else {
return (x * (x * (x * (x * (0.942810948279731997346f * x)) + -0.191839831351772377444f))
+ 0.942810948279731997346f);
}
}
//#define TANH tanhapprox
#define TANH tanhf
/* This code is transcribed from a Csound macro, so no real comments */
void LPF18_Ctor(LPF18 *unit)
{
float fco = ZIN0(1);
float res = ZIN0(2);
float dist = ZIN0(3);
float kfcn = 2.0f * fco * SAMPLEDUR;
float kp = ((-2.7528f*kfcn + 3.0429f)*kfcn +
1.718f)*kfcn - 0.9984f;
float kp1 = kp+1.0f;
float kres = res * (((-2.7079f*kp1 + 10.963f)*kp1
- 14.934f)*kp1 + 8.4974f);
float value = 1.0f+(dist*(1.5f+2.0f*kres*(1.0f-kfcn)));
unit->kp = kp;
unit->m_value = value;
unit->kres = kres;
unit->last_fco = fco;
/* Initialise delay lines */
unit->ay1 = 0.0f;
unit->ay2 = 0.0f;
unit->aout = 0.0f;
unit->lastin = 0.0f;
SETCALC(LPF18_next);
}
void LPF18_next(LPF18 *unit, int nsmps)
{
float *in = ZIN(0);
float *out = ZOUT(0);
float fco = ZIN0(1);
float res = ZIN0(2);
float dist = ZIN0(3);
float aout = unit->aout;
float ay1 = unit->ay1;
float ay2 = unit->ay2;
float lastin = unit->lastin;
float kfcn, kp = unit->kp;
float kp1, kp1h;
if (fco != unit->last_fco) {
kfcn = 2.0f * unit->last_fco * SAMPLEDUR;
kp1 = kp+1.0f;
kp1h = 0.5f*kp1;
float newkfcn = 2.0f * fco * SAMPLEDUR;
float newkp = ((-2.7528f*newkfcn + 3.0429f)*newkfcn +
1.718f)*newkfcn - 0.9984f;
float newkp1 = kp+1.0f;
float newkp1h = 0.5f*kp1;
float kp1hinc = (newkp1h-kp1h)/nsmps;
float kpinc = (newkp-kp)/nsmps;
float kres = unit->kres;
float newkres = res * (((-2.7079f*newkp1 + 10.963f)*newkp1
- 14.934f)*newkp1 + 8.4974f);
float kresinc = (newkres-kres)/nsmps;
float value = unit->m_value;
float newvalue = 1.0f+(dist*(1.5f+2.0f*newkres*(1.0f-newkfcn)));
float valueinc = (newvalue-value)/nsmps;
unit->kp = newkp;
unit->m_value = newvalue;
unit->kres = newkres;
unit->last_fco = fco;
LOOP(nsmps,
float ax1 = lastin;
float ay11 = ay1;
float ay31 = ay2;
lastin = ZXP(in) - TANH(kres*aout);
ay1 = kp1h * (lastin + ax1) - kp*ay1;
ay2 = kp1h * (ay1 + ay11) - kp*ay2;
aout = kp1h * (ay2 + ay31) - kp*aout;
ZXP(out) = TANH(aout*value);
kp1h += kp1hinc;
kp += kpinc;
kres += kresinc;
value += valueinc;
);
} else {
kfcn = 2.0f * fco * SAMPLEDUR;
kp1 = kp+1.0f;
kp1h = 0.5f*kp1;
/* Version using log */
/* float kres = *unit->res * (2.2173f - 1.6519f*log(kp+1.0f)); */
float kres = res * (((-2.7079f*kp1 + 10.963f)*kp1
- 14.934f)*kp1 + 8.4974f);
float value = 1.0f+(dist*(1.5f+2.0f*kres*(1.0f-kfcn)));
unit->m_value = value;
unit->kres = kres;
LOOP(nsmps,
float ax1 = lastin;
float ay11 = ay1;
float ay31 = ay2;
lastin = ZXP(in) - TANH(kres*aout);
ay1 = kp1h * (lastin + ax1) - kp*ay1;
ay2 = kp1h * (ay1 + ay11) - kp*ay2;
aout = kp1h * (ay2 + ay31) - kp*aout;
ZXP(out) = TANH(aout*value);
);
}
unit->ay1 = ay1;
unit->ay2 = ay2;
unit->aout = aout;
unit->lastin = lastin;
}
void
LPF1_Ctor (LPF1 *unit)
{
unit->m_y1 = 0.f;
if (INRATE(1) == calc_FullRate) {
SETCALC(LPF1_next_a);
} else {
unit->last_freq = ZIN0(1);
unit->p = (1.f-2.f*tanf((unit->last_freq/SAMPLERATE)));
SETCALC(LPF1_next);
}
}
void
LPF1_next (LPF1 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
float freq = ZIN0(1);
float p = unit->p;
float y1 = unit->m_y1;
if (unit->last_freq != freq) {
float newp = (1.f-2.f*tanf((freq/SAMPLERATE)));
float pinc = (newp-p)/inNumSamples;
unit->p=newp;
unit->last_freq=freq;
LOOP(inNumSamples,
ZXP(out) = y1 = (1.f-p)*ZXP(in)+ p*y1;
p += pinc;
);
} else {
LOOP(inNumSamples,
ZXP(out) = y1 = (1.f-p)*ZXP(in)+ p*y1;
);
}
unit->m_y1 = y1;
}
void
LPF1_next_a (LPF1 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
float *freq = ZIN(1);
float y1 = unit->m_y1;
float srate = SAMPLERATE;
LOOP(inNumSamples,
float p = (1.f-2.f*tanapprox((ZXP(freq)/srate)));
ZXP(out) = y1 = (1.f-p)*ZXP(in)+ p*y1;
);
unit->m_y1 = y1;
}
#define PI34 ((3.f/4.f)*((float)M_PI))
#define COSPI34 (-0.707106781186547461715)
static float proto[] = { -1.0, -6.3246, -40, -252.9824, -1600, -10119.2896, -64000 };
void
LPFVS6_Ctor (LPFVS6 *unit)
{
// force calculation of the poles and zeros
unit->last_freq = ZIN0(1);
unit->last_slope = ZIN0(2);
float *b = unit->b;
float *a = unit->a;
float g = 1.f;
unit->mem[0] = 0.f; unit->mem[1] = 0.f;
unit->mem[2] = 0.f; unit->mem[3] = 0.f;
float w = tanf((unit->last_freq*M_PI/(2.f*SAMPLERATE)));
// fprintf(stderr, "w: %f\n", w);
b[0] = bilinear(proto[0] * w);
//fprintf(stderr, "pole: %f, ", b[0]);
for (int i=1; i<5; i++) {
b[i] = bilinear(proto[i] * w);
// fprintf(stderr, "pole: %f, ", b[i]);
if (b[i] < 0.f) b[i] = 0.f;
a[i-1] = (b[i-1] + (b[i] - b[i-1]) * unit->last_slope);
if (a[i-1] < 0.f) a[i-1] = 0.f;
// normalization
g *= (1.f-b[i-1])/(1.f-a[i-1]);
//fprintf(stderr, "zero: %f, ", a[i-1]);
}
//fprintf(stderr, "g: %f\n", g);
unit->norm = g;
SETCALC(LPFVS6_next);
}
void
LPFVS6_next (LPFVS6 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
float freq = ZIN0(1);
float slope = ZIN0(2);
float g = unit->norm;
float *b = unit->b;
float *a = unit->a;
float *mem = unit->mem;
float binc[5];
float ainc[5];
float ginc;
#if 0
for (int i=0; i<4; i++) {
fprintf(stderr, "%f ", b[i]);
}
fprintf(stderr, "\n");
for (int i=0; i<4; i++) {
fprintf(stderr, "%f ", a[i]);
}
fprintf(stderr, "\n");
fprintf(stderr, "%f\n", g);
#endif
// calculate poles for new cutoff frequency
if (freq != unit->last_freq) {
float w = tanf((freq*M_PI/(2.f*SAMPLERATE)));
float nb[5];
float ng = 1.f;
nb[0] = bilinear(proto[0] * w);
binc[0] = (nb[0]-b[0])/inNumSamples;
for (int i=1; i<5; i++) {
float na;
nb[i] = bilinear(proto[i] * w);
//fprintf(stdout, "pole: %f\n", p);
if (nb[i] < 0.f) nb[i] = 0.f;
binc[i] = (nb[i]-b[i])/inNumSamples;
na = (nb[i-1] + (nb[i] - nb[i-1]) * slope);
if (na < 0.f) na = 0.f;
ainc[i-1] = (na - a[i-1])/inNumSamples;
// normalization
ng *= (1.f-nb[i-1])/(1.f-na);
}
ginc = (ng-g)/inNumSamples;
unit->last_freq = freq;
unit->last_slope = slope;
} else if (slope != unit->last_slope) {
// caculate for new slope
float ng = 1.f;
for (int i=0; i<4; i++) {
float na;
na = b[i] + (b[i+1] - b[i]) * slope;
if (na < 0.f) na = 0.f;
ng *= (1.f-b[i])/(1.f-na);
ainc[i] = (na - a[i])/inNumSamples;
}
ginc = (ng-g)/inNumSamples;
binc[0] = 0.f; binc[1] = 0.f;binc[2] = 0.f;binc[3] = 0.f;
// calculate normalization
unit->last_slope = slope;
} else {
ginc = 0.f;
binc[0] = 0.f; binc[1] = 0.f;binc[2] = 0.f;binc[3] = 0.f;
ainc[0] = 0.f; ainc[1] = 0.f;ainc[2] = 0.f;ainc[3] = 0.f;
}
LOOP(inNumSamples,
float x;
float y;
x = ZXP(in);
//for (k=0; k<4; k++) {
// y = x + b[k]*mem[k]; // first order section (direct form II)
// x = y + a[k]*mem[k];
// mem[k] = y;
//}
y = x + b[0]*mem[0]; // first order section (direct form II)
x = y - a[0]*mem[0];
mem[0] = y;
b[0] += binc[0];
a[0] += ainc[0];
y = x + b[1]*mem[1]; // first order section (direct form II)
x = y - a[1]*mem[1];
mem[1] = y;
b[1] += binc[1];
a[1] += ainc[1];
y = x + b[2]*mem[2]; // first order section (direct form II)
x = y - a[2]*mem[2];
mem[2] = y;
b[2] += binc[2];
a[2] += ainc[2];
y = x + b[3]*mem[3]; // first order section (direct form II)
x = y - a[3]*mem[3];
mem[3] = y;
b[3] += binc[3];
a[3] += ainc[3];
ZXP(out) = x*g;
g += ginc;
);
unit->norm = g;
mem[0] = zapgremlins(mem[0]);
mem[1] = zapgremlins(mem[1]);
mem[2] = zapgremlins(mem[2]);
mem[3] = zapgremlins(mem[3]);
}
////////////////////////////////////////////////////////////////////////////
#define BL_GET_BUF \
float fbufnum = ZIN0(0); \
if (fbufnum != unit->m_fbufnum) { \
uint32 bufnum = (int)fbufnum; \
World *world = unit->mWorld; \
if (bufnum >= world->mNumSndBufs) bufnum = 0; \
unit->m_fbufnum = fbufnum; \
unit->m_buf = world->mSndBufs + bufnum; \
} \
SndBuf *buf = unit->m_buf; \
#define BL_CHECK_BUF \
if (!bufData) { \
unit->mDone = true; \
ClearUnitOutputs(unit, inNumSamples); \
return; \
}
#define SINC(iphs, fphs) ((1.f-fphs) * sinctab[iphs] + fphs * sinctab[iphs+1])
#define SINCN(iphs) (sinctab[iphs])
void
BLBufRd_Ctor (BLBufRd *unit)
{
unit->m_fbufnum = -1.f;
SETCALC(BLBufRd_next);
}
void
BLBufRd_next (BLBufRd *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *phsin = ZIN(1);
float ratio = ZIN0(2);
BL_GET_BUF;
float *bufData = buf->data;
int bufFrames = buf->frames;
BL_CHECK_BUF;
LOOP(inNumSamples,
float sum = 0.f;
float phs = ZXP(phsin);
float ratio256 = 256.f*(1.f/ratio);
int pos = (int) phs;
int nsamps = (int) (ratio * 2.f);
float frac = phs - (float) pos;
int n;
n = sc_min(nsamps, pos);
for (int k=0; k<n; k++) {
float distance = frac+k;
float fphs = ratio256*distance;
//int iphs = (int) fphs;
//fphs = fphs - (float) iphs;
//sum += bufData[pos - k] * SINCN(iphs, fphs);
int iphs = lrintf(fphs);
sum += bufData[pos - k] * SINCN(iphs);
}
frac = 1.f - frac;
pos ++;
n = sc_min(nsamps, bufFrames-pos);
for (int k=0; k<n; k++) {
float distance = frac+k;
float fphs = ratio256*distance;
//int iphs = (int) fphs;
//fphs = fphs - (float) iphs;
//sum += bufData[pos - k] * SINCN(iphs, fphs);
int iphs = lrintf(fphs);
sum += bufData[pos + k] * SINCN(iphs);
}
ZXP(out) = sum/ratio;
);
}
void
Clipper8_Ctor (Clipper8 *unit)
{
OVERSAMPLE8_INIT;
SETCALC(Clipper8_next);
}
void
Clipper8_next (Clipper8 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
float min = ZIN0(1);
float max = ZIN0(2);
UPSAMPLE8;
for (int j=0; j<(inNumSamples*8); j++) {
domemoff[j] = sc_clip(domemoff[j], min, max);
}
DOWNSAMPLE8;
}
////////////////////////////////////////////////////////////////
void
Clipper4_Ctor (Clipper4 *unit)
{
OVERSAMPLE4_INIT;
SETCALC(Clipper4_next);
}
void
Clipper4_next (Clipper4 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
float min = ZIN0(1);
float max = ZIN0(2);
UPSAMPLE4;
for (int j=0; j<(inNumSamples*4); j++) {
domemoff[j] = sc_clip(domemoff[j], min, max);
// domemoff[j] = domemoff[j] * 0.25;
}
//DOWNSAMPLE4;
DOWNSAMPLE4;
}
////////////////////////////////////////////////////////////////////////////
void
SoftClipper8_Ctor (SoftClipper8 *unit)
{
OVERSAMPLE8_INIT;
SETCALC(SoftClipper8_next);
}
void
SoftClipper8_next (SoftClipper8 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
UPSAMPLE8;
for (int j=0; j<(inNumSamples*8); j++) {
domemoff[j] = sc_softclip(domemoff[j]);
}
DOWNSAMPLE8;
}
////////////////////////////////////////////////////////////////
void
SoftClipper4_Ctor (SoftClipper4 *unit)
{
OVERSAMPLE4_INIT;
SETCALC(SoftClipper4_next);
}
void
SoftClipper4_next (SoftClipper4 *unit, int inNumSamples)
{
float *out = ZOUT(0);
float *in = ZIN(0);
UPSAMPLE4;
for (int j=0; j<(inNumSamples*4); j++) {
domemoff[j] = sc_softclip(domemoff[j]);
}
DOWNSAMPLE4;
}
//////////////////////////////////////////////////////////////////////////
void
DriveNoise_Ctor (DriveNoise *unit)
{
SETCALC(DriveNoise_next);
}