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/* sIgpAck
* for
* pure-data
* www.weiss-archiv.de */
#include "m_pd.h"
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
// ------------------------ sp.decimate~ -----------------------------
// signal decimation
// code from musicdsp.org posted by tobybear
static t_class *decimate_tilde_class;
typedef struct _decimate_tilde
{
t_object x_obj;
t_sample x_rate;
t_sample x_bits;
float x_f;
} t_decimate_tilde;
static void *decimate_tilde_new(t_floatarg rate, t_floatarg bits)
{
t_decimate_tilde *x = (t_decimate_tilde *)pd_new(decimate_tilde_class);
x->x_rate = rate;
x->x_bits = bits;
outlet_new(&x->x_obj, gensym("signal"));
floatinlet_new(&x->x_obj, &x->x_rate);
floatinlet_new(&x->x_obj, &x->x_bits);
x->x_f = 0;
if (rate) x->x_rate = rate;
else x->x_rate = 0.5;
if (bits) x->x_bits = bits;
else x->x_bits = 16;
return (x);
}
static t_int *decimate_tilde_perform(t_int *w)
{
t_decimate_tilde *x = (t_decimate_tilde *)(w[1]);
t_float *in = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
int n = (int)(w[4]);
float f;
long int m=1<<(int)(x->x_bits-1);
float y=0, cnt=0;
while (n--)
{
f = *in++;
cnt+=x->x_rate;
if (cnt>=1)
{
cnt-=1;
y=(long int)(f*m)/(float)m;
}
*out++ = y;
}
return (w+5);
}
static void decimate_tilde_dsp(t_decimate_tilde *x, t_signal **sp)
{
dsp_add(decimate_tilde_perform, 4, x, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void decimate_tilde_setup(void)
{
decimate_tilde_class = class_new(gensym("sp.decimate~"), (t_newmethod)decimate_tilde_new, 0,
sizeof(t_decimate_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(decimate_tilde_class, t_decimate_tilde, x_f);
class_addmethod(decimate_tilde_class, (t_method)decimate_tilde_dsp, gensym("dsp"), 0);
}
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