ref: db8bc76702cbd252d10f6f60bfae8cb9d167c38c
dir: /LEAF/Src/leaf-string.c/
/*
==============================================================================
leaf-string.cpp
Created: 30 Nov 2018 10:41:42am
Author: airship
==============================================================================
*/
#if _WIN32 || _WIN64
#include "..\Inc\leaf-string.h"
#else
#include "../Inc/leaf-string.h"
#endif
/* ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ tPluck ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ */
void tPluck_init (tPluck* const p, float lowestFrequency)
{
if ( lowestFrequency <= 0.0f ) lowestFrequency = 10.0f;
p->noise = (tNoise*)leaf_alloc(sizeof(tNoise));
tNoise_init(p->noise, WhiteNoise);
p->pickFilter = (tOnePole*) leaf_alloc(sizeof(tOnePole));
tOnePole_init(p->pickFilter, 0.0f);
p->loopFilter = (tOneZero*) leaf_alloc(sizeof(tOneZero));
tOneZero_init(p->loopFilter, 0.0f);
p->delayLine = (tDelayA*) leaf_alloc(sizeof(tDelayA));
tDelayA_init(p->delayLine, 0.0f, leaf.sampleRate * 2);
tPluck_setFrequency(p, 220.0f);
}
float tPluck_getLastOut (tPluck *p)
{
return p->lastOut;
}
float tPluck_tick (tPluck *p)
{
return (p->lastOut = 3.0f * tDelayA_tick(p->delayLine, tOneZero_tick(p->loopFilter, tDelayA_getLastOut(p->delayLine) * p->loopGain ) ));
}
void tPluck_pluck (tPluck* const p, float amplitude)
{
if ( amplitude < 0.0f) amplitude = 0.0f;
else if (amplitude > 1.0f) amplitude = 1.0f;
tOnePole_setPole(p->pickFilter, 0.999f - (amplitude * 0.15f));
tOnePole_setGain(p->pickFilter, amplitude * 0.5f );
// Fill delay with noise additively with current contents.
for ( uint32_t i = 0; i < (uint32_t)tDelayA_getDelay(p->delayLine); i++ )
tDelayA_tick(p->delayLine, 0.6f * tDelayA_getLastOut(p->delayLine) + tOnePole_tick(p->pickFilter, tNoise_tick(p->noise) ) );
}
// Start a note with the given frequency and amplitude.;
void tPluck_noteOn (tPluck* const p, float frequency, float amplitude )
{
p->lastFreq = frequency;
tPluck_setFrequency( p, frequency );
tPluck_pluck( p, amplitude );
}
// Stop a note with the given amplitude (speed of decay).
void tPluck_noteOff (tPluck* const p, float amplitude )
{
if ( amplitude < 0.0f) amplitude = 0.0f;
else if (amplitude > 1.0f) amplitude = 1.0f;
p->loopGain = 1.0f - amplitude;
}
// Set instrument parameters for a particular frequency.
void tPluck_setFrequency (tPluck* const p, float frequency )
{
if ( frequency <= 0.0f ) frequency = 0.001f;
// Delay = length - filter delay.
float delay = ( leaf.sampleRate / frequency ) - tOneZero_getPhaseDelay(p->loopFilter, frequency );
tDelayA_setDelay(p->delayLine, delay );
p->loopGain = 0.99f + (frequency * 0.000005f);
if ( p->loopGain >= 0.999f ) p->loopGain = 0.999f;
}
// Perform the control change specified by \e number and \e value (0.0 - 128.0).
void tPluck_controlChange (tPluck* const p, int number, float value)
{
return;
}
void tPluckSampleRateChanged(tPluck* const p)
{
//tPluckSetFrequency(p, p->lastFreq);
}
/* ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ tStifKarp ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ */
void tStifKarp_init (tStifKarp* const p, float lowestFrequency)
{
if ( lowestFrequency <= 0.0f ) lowestFrequency = 8.0f;
p->delayLine = (tDelayA*) leaf_alloc(sizeof(tDelayA));
tDelayA_init(p->delayLine, 0.0f, leaf.sampleRate * 2);
p->combDelay = (tDelayL*) leaf_alloc(sizeof(tDelayL));
tDelayL_init(p->combDelay, 0.0f, leaf.sampleRate * 2);
p->filter = (tOneZero*) leaf_alloc(sizeof(tOneZero));
tOneZero_init(p->filter, 0.0f);
p->noise = (tNoise*) leaf_alloc(sizeof(tNoise));
tNoise_init(p->noise, WhiteNoise);
for (int i = 0; i < 4; i++)
{
p->biquad[i] = (tBiQuad*) leaf_alloc(sizeof(tBiQuad));
tBiQuad_init(p->biquad[i]);
}
p->pluckAmplitude = 0.3f;
p->pickupPosition = 0.4f;
p->stretching = 0.9999f;
p->baseLoopGain = 0.995f;
p->loopGain = 0.999f;
tStifKarp_setFrequency( p, 220.0f );
}
void tStifKarp_free (tStifKarp* const p)
{
tDelayA_free(p->delayLine);
tDelayL_free(p->combDelay);
tOneZero_free(p->filter);
tNoise_free(p->noise);
for (int i = 0; i < 4; i++)
{
tBiQuad_free(p->biquad[i]);
}
leaf_free(p);
}
float tStifKarp_getLastOut (tStifKarp* const p)
{
return p->lastOut;
}
float tStifKarp_tick (tStifKarp* const p)
{
float temp = tDelayA_getLastOut(p->delayLine) * p->loopGain;
// Calculate allpass stretching.
for (int i=0; i<4; i++) temp = tBiQuad_tick(p->biquad[i],temp);
// Moving average filter.
temp = tOneZero_tick(p->filter, temp);
float out = tDelayA_tick(p->delayLine, temp);
out = out - tDelayL_tick(p->combDelay, out);
p->lastOut = out;
return p->lastOut;
}
void tStifKarp_pluck (tStifKarp* const p, float amplitude)
{
if ( amplitude < 0.0f) amplitude = 0.0f;
else if (amplitude > 1.0f) amplitude = 1.0f;
p->pluckAmplitude = amplitude;
for ( uint32_t i=0; i < (uint32_t)tDelayA_getDelay(p->delayLine); i++ )
{
// Fill delay with noise additively with current contents.
tDelayA_tick(p->delayLine, (tDelayA_getLastOut(p->delayLine) * 0.6f) + 0.4f * tNoise_tick(p->noise) * p->pluckAmplitude );
//delayLine_.tick( combDelay_.tick((delayLine_.lastOut() * 0.6) + 0.4 * noise->tick() * pluckAmplitude_) );
}
}
// Start a note with the given frequency and amplitude.;
void tStifKarp_noteOn (tStifKarp* const p, float frequency, float amplitude )
{
tStifKarp_setFrequency( p, frequency );
tStifKarp_pluck( p, amplitude );
}
// Stop a note with the given amplitude (speed of decay).
void tStifKarp_noteOff (tStifKarp* const p, float amplitude )
{
if ( amplitude < 0.0f) amplitude = 0.0f;
else if (amplitude > 1.0f) amplitude = 1.0f;
p->loopGain = 1.0f - amplitude;
}
// Set instrument parameters for a particular frequency.
void tStifKarp_setFrequency (tStifKarp* const p, float frequency )
{
if ( frequency <= 0.0f ) frequency = 0.001f;
p->lastFrequency = frequency;
p->lastLength = leaf.sampleRate / p->lastFrequency;
float delay = p->lastLength - 0.5f;
tDelayA_setDelay(p->delayLine, delay );
// MAYBE MODIFY LOOP GAINS
p->loopGain = p->baseLoopGain + (frequency * 0.000005f);
if (p->loopGain >= 1.0f) p->loopGain = 0.99999f;
tStifKarp_setStretch(p, p->stretching);
tDelayL_setDelay(p->combDelay, 0.5f * p->pickupPosition * p->lastLength );
}
// Set the stretch "factor" of the string (0.0 - 1.0).
void tStifKarp_setStretch (tStifKarp* const p, float stretch )
{
p->stretching = stretch;
float coefficient;
float freq = p->lastFrequency * 2.0f;
float dFreq = ( (0.5f * leaf.sampleRate) - freq ) * 0.25f;
float temp = 0.5f + (stretch * 0.5f);
if ( temp > 0.9999f ) temp = 0.9999f;
for ( int i=0; i<4; i++ )
{
coefficient = temp * temp;
tBiQuad_setA2(p->biquad[i], coefficient);
tBiQuad_setB0(p->biquad[i], coefficient);
tBiQuad_setB2(p->biquad[i], 1.0f);
coefficient = -2.0f * temp * cos(TWO_PI * freq / leaf.sampleRate);
tBiQuad_setA1(p->biquad[i], coefficient);
tBiQuad_setB1(p->biquad[i], coefficient);
freq += dFreq;
}
}
// Set the pluck or "excitation" position along the string (0.0 - 1.0).
void tStifKarp_setPickupPosition (tStifKarp* const p, float position )
{
if (position < 0.0f) p->pickupPosition = 0.0f;
else if (position <= 1.0f) p->pickupPosition = position;
else p->pickupPosition = 1.0f;
tDelayL_setDelay(p->combDelay, 0.5f * p->pickupPosition * p->lastLength);
}
// Set the base loop gain.
void tStifKarp_setBaseLoopGain (tStifKarp* const p, float aGain )
{
p->baseLoopGain = aGain;
p->loopGain = p->baseLoopGain + (p->lastFrequency * 0.000005f);
if ( p->loopGain > 0.99999f ) p->loopGain = 0.99999f;
}
// Perform the control change specified by \e number and \e value (0.0 - 128.0).
void tStifKarp_controlChange (tStifKarp* const p, SKControlType type, float value)
{
if ( value < 0.0f ) value = 0.0f;
else if (value > 128.0f) value = 128.0f;
float normalizedValue = value * INV_128;
if (type == SKPickPosition) // 4
tStifKarp_setPickupPosition( p, normalizedValue );
else if (type == SKStringDamping) // 11
tStifKarp_setBaseLoopGain( p, 0.97f + (normalizedValue * 0.03f) );
else if (type == SKDetune) // 1
tStifKarp_setStretch( p, 0.91f + (0.09f * (1.0f - normalizedValue)) );
}
void tStifKarpSampleRateChanged (tStifKarp* const c)
{
tStifKarp_setFrequency(c, c->lastFrequency);
tStifKarp_setStretch(c, c->stretching);
}