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/*
physutil.h:
Copyright (C) 1996, 1997 Perry Cook, John ffitch
This file is part of Csound.
The Csound Library is free software; you can redistribute it
and/or modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Csound 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with Csound; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#if !defined(__PhysUtil_h)
#define __PhysUtil_h
/* Various filters etc for Physical models */
#include <math.h>
#define AMP_SCALE (csound->e0dbfs)
#define AMP_RSCALE (csound->dbfs_to_float)
/*******************************************/
/* Noise Generator Class, */
/* by Perry R. Cook, 1995-96 */
/* White noise as often as you like. */
/* Recoded by John ffitch 1997 */
/*******************************************/
typedef MYFLT Noise;
#define make_Noise(n) n = FL(0.0)
MYFLT Noise_tick(CSOUND *, Noise *);
#define Noise_lastOut(n) (n)
/*******************************************/
/* Linearly Interpolating Delay Line */
/* Object by Perry R. Cook 1995-96 */
/* Recoded by John ffitch 1997 */
/*******************************************/
typedef struct DLineL{
AUXCH inputs;
MYFLT lastOutput;
int32 inPoint;
int32 outPoint;
int32 length;
MYFLT alpha;
MYFLT omAlpha;
} DLineL;
#define DLineL_lastOut(d) ((d)->lastOutput)
void make_DLineL(CSOUND *,DLineL *, int32);
void DLineL_setDelay(DLineL *, MYFLT);
MYFLT DLineL_tick(DLineL *, MYFLT);
/*******************************************/
/* Envelope Class, Perry R. Cook, 1995-96 */
/* This is the base class for envelopes. */
/* This one is capable of ramping state */
/* from where it is to a target value by */
/* a rate. It also responds to simple */
/* KeyOn and KeyOff messages, ramping to */
/* 1.0 on keyon and to 0.0 on keyoff. */
/* There are two tick (update value) */
/* methods, one returns the value, and */
/* other returns 0 if the envelope is at */
/* the target value (the state bit). */
/*******************************************/
#define RATE_NORM (FL(22050.0)/csound->esr)
typedef struct Envelope {
MYFLT value;
MYFLT target;
MYFLT rate;
int32_t state;
} Envelope;
void make_Envelope(Envelope*);
void Envelope_keyOn(Envelope*);
void Envelope_keyOff(Envelope*);
void Envelope_setRate(CSOUND *,Envelope*, MYFLT);
void Envelope_setTarget(Envelope*, MYFLT);
void Envelope_setValue(Envelope*,MYFLT);
MYFLT Envelope_tick(Envelope*);
void Envelope_print(CSOUND *,Envelope*);
/*******************************************/
/* One Pole Filter Class, */
/* by Perry R. Cook, 1995-96 */
/* The parameter gain is an additional */
/* gain parameter applied to the filter */
/* on top of the normalization that takes */
/* place automatically. So the net max */
/* gain through the system equals the */
/* value of gain. sgain is the combina- */
/* tion of gain and the normalization */
/* parameter, so if you set the poleCoeff */
/* to alpha, sgain is always set to */
/* gain * (1.0 - fabs(alpha)). */
/*******************************************/
typedef struct OnePole {
MYFLT gain; /* Start Filter subclass */
MYFLT outputs;
/* MYFLT *inputs; */
/* MYFLT lastOutput; */ /* End */
MYFLT poleCoeff;
MYFLT sgain;
} OnePole;
void make_OnePole(OnePole*);
/* void OnePole_clear(OnePole*); */
void OnePole_setPole(OnePole*, MYFLT aValue);
void OnePole_setGain(OnePole*, MYFLT aValue);
MYFLT OnePole_tick(OnePole*, MYFLT sample);
void OnePole_print(CSOUND*, OnePole*);
/*******************************************/
/* DC Blocking Filter */
/* by Perry R. Cook, 1995-96 */
/* This guy is very helpful in, uh, */
/* blocking DC. Needed because a simple */
/* low-pass reflection filter allows DC */
/* to build up inside recursive */
/* structures. */
/*******************************************/
typedef struct DCBlock {
MYFLT gain;
MYFLT outputs;
MYFLT inputs;
/* MYFLT lastOutput; */
} DCBlock;
void make_DCBlock(DCBlock*);
/* void DCBlock_clear(DCBlock*); */
MYFLT DCBlock_tick(DCBlock*, MYFLT);
/*******************************************/
/* ADSR Subclass of the Envelope Class, */
/* by Perry R. Cook, 1995-96 */
/* This is the traditional ADSR (Attack */
/* Decay, Sustain, Release) envelope. */
/* It responds to simple KeyOn and KeyOff */
/* messages, keeping track of it's state. */
/* There are two tick (update value) */
/* methods, one returns the value, and */
/* other returns the state (0 = A, 1 = D, */
/* 2 = S, 3 = R) */
/*******************************************/
#define ATTACK (0)
#define DECAY (1)
#define SUSTAIN (2)
#define RELEASE (3)
#define CLEAR (4)
typedef struct ADSR {
MYFLT value; /* Envelope subclass */
MYFLT target;
MYFLT rate;
int32_t state; /* end */
MYFLT attackRate;
MYFLT decayRate;
MYFLT sustainLevel;
MYFLT releaseRate;
} ADSR;
void make_ADSR(ADSR*);
void dest_ADSR(ADSR*);
void ADSR_keyOn(ADSR*);
void ADSR_keyOff(ADSR*);
void ADSR_setAttackRate(CSOUND *,ADSR*, MYFLT);
void ADSR_setDecayRate(CSOUND *,ADSR*, MYFLT);
void ADSR_setSustainLevel(CSOUND *,ADSR*, MYFLT);
void ADSR_setReleaseRate(CSOUND *,ADSR*, MYFLT);
void ADSR_setAll(CSOUND *,ADSR*, MYFLT, MYFLT, MYFLT, MYFLT);
void ADSR_setAllTimes(CSOUND *,ADSR*, MYFLT, MYFLT, MYFLT, MYFLT);
void ADSR_setTarget(CSOUND *,ADSR*, MYFLT);
void ADSR_setValue(CSOUND *,ADSR*, MYFLT);
MYFLT ADSR_tick(ADSR*);
int32_t
ADSR_informTick(ADSR*);
MYFLT ADSR_lastOut(ADSR*);
/*******************************************/
/* BiQuad (2-pole, 2-zero) Filter Class, */
/* by Perry R. Cook, 1995-96 */
/* See books on filters to understand */
/* more about how this works. Nothing */
/* out of the ordinary in this version. */
/*******************************************/
typedef struct BiQuad {
MYFLT gain; /* Start if filter subclass */
MYFLT inputs[2];
MYFLT lastOutput; /* End */
MYFLT poleCoeffs[2];
MYFLT zeroCoeffs[2];
} BiQuad;
void make_BiQuad(BiQuad*);
void dest_BiQuad(BiQuad*);
void BiQuad_clear(BiQuad*);
void BiQuad_setPoleCoeffs(BiQuad*, MYFLT *);
void BiQuad_setZeroCoeffs(BiQuad*, MYFLT *);
#define BiQuad_setGain(b,aValue) ((b).gain = aValue)
#define BiQuad_setEqualGainZeroes(b) \
{ (b).zeroCoeffs[1] = -FL(1.0); (b).zeroCoeffs[0] = FL(0.0); }
#define BiQuad_setFreqAndReson(b,freq,reson) \
{ (b).poleCoeffs[1]= -((reson)*(reson)); \
(b).poleCoeffs[0]= FL(2.0)*(reson)*\
(MYFLT)cos((double)(freq)*(double)csound->tpidsr); }
MYFLT BiQuad_tick(BiQuad*, MYFLT);
#define BiQuad_lastOut(x) (x)->lastOutput
#endif
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