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/* loop~ -- loop generator for sampling */
/* Copyright 1997-1999 Miller Puckette.
Permission is granted to use this software for any purpose provided you
keep this copyright notice intact.
THE AUTHOR AND HIS EMPLOYERS MAKE NO WARRANTY, EXPRESS OR IMPLIED,
IN CONNECTION WITH THIS SOFTWARE.
This file is downloadable from http://www.crca.ucsd.edu/~msp .
*/
#ifdef PD
#include "m_pd.h"
#endif
typedef struct _loopctl
{
double l_phase;
float l_invwindow;
float l_window;
int l_resync;
} t_loopctl;
static void loopctl_run(t_loopctl *x, float *transposein,
float *windowin, float *rawout, float *windowout, int n)
{
float window, invwindow;
double phase = x->l_phase;
if (x->l_resync)
{
window = *windowin;
if (window < 0)
{
if (window > -1)
window = -1;
invwindow = -1/window;
}
else
{
if (window < 1)
window = 1;
invwindow = 1/window;
}
x->l_resync = 0;
}
else
{
window = x->l_window;
phase = x->l_phase;
invwindow = x->l_invwindow;
}
while (n--)
{
double phaseinc = invwindow * *transposein++;
double newphase;
float nwind = *windowin++;
if (phaseinc >= 1 || phaseinc < 0)
phaseinc = 0;
newphase = phase + phaseinc;
if (newphase >= 1)
{
window = nwind;
if (window < 0)
{
if (window > -1)
window = -1;
invwindow = -1/window;
}
else
{
if (window < 1)
window = 1;
invwindow = 1/window;
}
newphase -= 1.;
}
phase = newphase;
*rawout++ = (float)phase;
*windowout++ = window;
}
x->l_invwindow = invwindow;
x->l_window = window;
x->l_phase = phase;
}
static void loopctl_init(t_loopctl *x)
{
x->l_window = 1;
x->l_invwindow = 1;
x->l_phase = 0;
}
static void loopctl_set(t_loopctl *x, float val)
{
if (val < 0 || val > 1)
val = 0;
x->l_phase = val;
x->l_resync = 1;
}
#ifdef PD
typedef struct _loop
{
t_object x_obj;
t_float x_f;
t_loopctl x_loopctl;
} t_loop;
static t_class *loop_class;
static void *loop_new(void)
{
t_loop *x = (t_loop *)pd_new(loop_class);
loopctl_init(&x->x_loopctl);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
outlet_new(&x->x_obj, gensym("signal"));
outlet_new(&x->x_obj, gensym("signal"));
return (x);
}
static t_int *loop_perform(t_int *w)
{
t_loopctl *ctl = (t_loopctl *)(w[1]);
t_float *in1 = (t_float *)(w[2]);
t_float *in2 = (t_float *)(w[3]);
t_float *out1 = (t_float *)(w[4]);
t_float *out2 = (t_float *)(w[5]);
int n = (int)(w[6]);
loopctl_run(ctl, in1, in2, out1, out2, n);
return (w+7);
}
static void loop_dsp(t_loop *x, t_signal **sp)
{
dsp_add(loop_perform, 6,
&x->x_loopctl, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec,
sp[0]->s_n);
}
static void loop_set(t_loop *x, t_floatarg val)
{
loopctl_set(&x->x_loopctl, val);
}
static void loop_bang(t_loop *x)
{
loopctl_set(&x->x_loopctl, 0);
}
void loop_tilde_setup(void)
{
loop_class = class_new(gensym("loop~"), (t_newmethod)loop_new, 0,
sizeof(t_loop), 0, 0);
class_addmethod(loop_class, (t_method)loop_dsp, gensym("dsp"), A_CANT, 0);
CLASS_MAINSIGNALIN(loop_class, t_loop, x_f);
class_addmethod(loop_class, (t_method)loop_set, gensym("set"),
A_DEFFLOAT, 0);
class_addbang(loop_class, loop_bang);
}
#endif /* PD */
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