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/*
* wavestretcher~ - above and below a threshold, the waveform is stretched or squashed
* Copyright (c) 2012, Dr Edward Kelly <morph_2016@yahoo.co.uk>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
*
* provided with the distribution.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "m_pd.h"
#include <math.h>
#define _limit 0.99999
static t_class *wavestretcher_tilde_class;
typedef struct _wavestretcher_tilde {
t_object x_obj;
t_float token, bipolar;
// t_float token, debug, safety;
t_outlet *stretched;
} t_wavestretcher_tilde;
static inline float saturate( float input ) { //clamp without branching
float x1 = fabsf( input + _limit );
float x2 = fabsf( input - _limit );
return 0.5 * (x1 - x2);
}
t_int *wavestretcher_tilde_perform(t_int *w) {
t_wavestretcher_tilde *x = (t_wavestretcher_tilde *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *thresh = (t_sample *)(w[3]);
t_sample *stretch = (t_sample *)(w[4]);
t_sample *out = (t_sample *)(w[5]);
int n = (int)(w[6]);
t_float insample = 0;
t_float outsample = 0;
t_float thsample = 0;
t_float stsample = 0;
t_float stnegative = 0;
t_float stosample = 0;
t_float stusample = 0;
t_float reciprocal = 0;
t_float remainder = 0;
t_float remciprocal = 0;
while (n--)
{
insample = *in++;
thsample = saturate(*thresh++);
thsample = thsample * 0.5 + 0.5;
stsample = *stretch++;
stnegative = 0 - stsample;
reciprocal = 1 / thsample;
remainder = 1 - thsample;
remciprocal = 1 / remainder;
if(stsample > 0) {
stusample = stsample * reciprocal + (1 - stsample);
stosample = 1 - stsample;
outsample = *out++ = insample < thsample && insample > -thsample ? insample * stusample : insample >= thsample ? insample * stosample + stsample : insample * stosample - stsample;
} else if (stsample < 0) {
stusample = 1 - stnegative;
stosample = stnegative * remciprocal + (1 - stnegative);
outsample = *out++ = insample < thsample && insample > -thsample ? insample * stusample : insample >= thsample ? (insample - thsample) * stosample + thsample * (1 - stnegative) : (insample + thsample) * stosample - thsample * (1 - stnegative);
} else if (stsample == 0) {
outsample = *out++ = insample;
}
}
return (w+7);
}
void wavestretcher_tilde_bipolar(t_wavestretcher_tilde *x, t_floatarg f) {
x->bipolar = f;
}
void wavestretcher_tilde_dsp(t_wavestretcher_tilde *x, t_signal **sp) {
dsp_add(wavestretcher_tilde_perform, 6, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[0]->s_n);
}
void *wavestretcher_tilde_new(t_floatarg f) {
t_wavestretcher_tilde *x = (t_wavestretcher_tilde *)pd_new(wavestretcher_tilde_class);
inlet_new (&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
inlet_new (&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
outlet_new(&x->x_obj, &s_signal);
return (void *)x;
}
void wavestretcher_tilde_setup(void) {
wavestretcher_tilde_class = class_new(gensym("wavestretcher~"),
(t_newmethod)wavestretcher_tilde_new,
0, sizeof(t_wavestretcher_tilde),
CLASS_DEFAULT, A_DEFFLOAT, 0);
post("~~~~~~~~~~~~~~~>wavestretcher~");
post("~~~>by Ed Kelly, 2012");
class_addmethod(wavestretcher_tilde_class,
(t_method)wavestretcher_tilde_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(wavestretcher_tilde_class, t_wavestretcher_tilde, token);
class_addmethod(wavestretcher_tilde_class, (t_method)wavestretcher_tilde_bipolar, gensym("bipolar"), A_DEFFLOAT, 0);
// class_addmethod(wavestretcher_tilde_class, (t_method)wavestretcher_tilde_mode, gensym("mode"), A_DEFFLOAT, 0);
}
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