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#include "m_pd.h"
#ifdef NT
#include "stdafx.h"
#include <io.h>
#endif
#include <stdlib.h>
#include<time.h>
#include "pin~.h"
/* ------------------------ pin_tilde~ ----------------------------- */
static t_class *pin_tilde_class;
/**
* the perform routine unpacks its parameters
* looks to see if time is zero (do channel prob
* everytime) if it is to chooses a channel.
* the routine then copies everything in the input
* to the choosen output
*/
t_int *pin_tilde_perform(t_int *w)
{
float *in = (float *)(w[1]);
float *outl = (float *)(w[2]);
float *outr = (float *)(w[3]);
t_pin_tilde*obj = (t_pin_tilde *)(w[4]);
int n = (t_int)(w[5]);
int i = 0;
if ( obj->p_ticktime <= 0 )
{
if ( rand() < obj->p_normalized_prob )
{
obj->p_outchannel=0;
}
else
{
obj->p_outchannel=1;
}
}
if ( obj->p_outchannel == 0 )
{
for( i = 0 ; i< n ; i++ )
{
*outl++ = *in++;
*outr++ = 0;
}
}
else
{
for( i = 0 ; i< n ; i++ )
{
*outr++ = *in++;
*outl++ = 0;
}
}
return w+6;
}
/**
* set up our dsp perform routine - it takes parameters
* the input channel, the output channels ( left and right),
* the pin object and the number of samples in the array
*/
static void pin_tilde_dsp(t_pin_tilde *x, t_signal **sp)
{
dsp_add(pin_tilde_perform, 5,sp[0]->s_vec, sp[1]->s_vec , sp[2]->s_vec , x ,sp[0]->s_n);
}
/**
* free up the tilde object - for now we only need
* to get rid of the clock
*/
static void pin_tilde_free(t_pin_tilde *x)
{
clock_free( x->p_clock );
}
/**
* make a new object - set up out internal variables
* and add our inlets and outlets
*/
static void *pin_tilde_new(t_floatarg prob , t_floatarg tick)
{
t_pin_tilde *x = (t_pin_tilde *)pd_new(pin_tilde_class);
if ( prob < 0 )
{
post("probability must be between 0 and 1 ");
prob = 0;
}
else if( prob > 1 )
{
post("probability must be between 0 and 1 ");
prob = 1;
}
else if (prob == 0 )
{
// note that prob defaullts to 0.5
prob = 0.5;
}
x->p_prob = prob;
x->p_normalized_prob = prob * RAND_MAX;
// set up our clocks
x->p_ticktime = tick;
x->p_clock = clock_new(x, (t_method) pin_tilde_tick);
if (x->p_ticktime > 0)
{
clock_delay(x->p_clock, x->p_ticktime);
}
// start off with a random channel
if ( rand() < x->p_normalized_prob )
{
x->p_outchannel=0;
}
else
{
x->p_outchannel=1;
}
// set up our inlets
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("prob"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, gensym("float"), gensym("tick"));
outlet_new(&x->x_obj, gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
/**
* ticktime has been set - we only care about ticks above
* zero.
*/
static void pin_tilde_ticktime( t_pin_tilde* x, t_float tick )
{
x->p_ticktime = tick;
if ( x->p_ticktime > 0 )
{
clock_delay(x->p_clock, x->p_ticktime);
}
}
/**
* allows the probability to be set - note that although
* we accept a probability between 0 and 1 we need to
* normalize it becuase rand() produces a number between
* 0 and rand_max. We precalucluate the normalized
* number becuase we sometimes use it in the dsp routine
* (if tick is zero).
*/
static void pin_tilde_prob( t_pin_tilde* x, t_float prob )
{
if ( prob < 0 )
{
post("probability must be between 0 and 1 ");
prob = 0;
}
else if( prob > 1 )
{
post("probability must be between 0 and 1 ");
prob = 1;
}
x->p_prob=prob;
x->p_normalized_prob = prob * RAND_MAX;
}
/**
* clock tick - choose a channel and wait again
*/
static void pin_tilde_tick(t_pin_tilde *x)
{
if ( rand() < x->p_normalized_prob )
{
x->p_outchannel=0;
}
else
{
x->p_outchannel=1;
}
if (x->p_ticktime > 0)
{
clock_delay(x->p_clock, x->p_ticktime);
}
}
/**
* setup - add our methods and seed the random number generator
*/
void pin_tilde_setup(void)
{
srand( (unsigned) time( NULL ) );
pin_tilde_class = class_new(gensym("pin~"), (t_newmethod) pin_tilde_new, (t_method) pin_tilde_free,
sizeof(t_pin_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN( pin_tilde_class, t_pin_tilde, x_f);
class_addmethod(pin_tilde_class, (t_method) pin_tilde_dsp, gensym("dsp"), (t_atomtype)0);
class_addmethod(pin_tilde_class, (t_method) pin_tilde_ticktime, gensym("tick") , A_DEFFLOAT , (t_atomtype)0 );
class_addmethod(pin_tilde_class, (t_method) pin_tilde_prob, gensym("prob") , A_DEFFLOAT , (t_atomtype)0 );
class_sethelpsymbol(pin_tilde_class, gensym("mjLib/pin~"));
}
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