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#include "m_pd.h"
#define MIN(a,b) (((a)<(b))?(a):(b))
#define MAX(a,b) (((a)>(b))?(a):(b))
static t_class *tab_downsample_class;
typedef struct _tab_downsample {
t_object x_obj;
t_symbol *x_arrayname_src;
t_symbol *x_arrayname_dst;
int factor, offset;
t_outlet *b_out;
} t_tab_downsample;
void *tab_downsample_new(t_symbol *s_src,t_symbol *s_dst, t_float factor)
{
t_tab_downsample *x = (t_tab_downsample *)pd_new(tab_downsample_class);
x->x_arrayname_src = s_src;
x->x_arrayname_dst = s_dst;
x->factor = factor;
x->offset = 0;
x->b_out = outlet_new(&x->x_obj, &s_bang);
return (void *)x;
}
void tab_downsample_compute(t_tab_downsample *x)
{
t_garray *a_src, *a_dst;
int npoints_src, npoints_dst;
t_word *vec_src, *vec_dst;
int nb_max, i, index_src;
if (!(a_src = (t_garray *)pd_findbyclass(x->x_arrayname_src, garray_class)))
pd_error(x, "%s: no such array", x->x_arrayname_src->s_name);
else if (!garray_getfloatwords(a_src, &npoints_src, &vec_src))
pd_error(x, "%s: bad template for tab_downsample", x->x_arrayname_src->s_name);
else if (!(a_dst = (t_garray *)pd_findbyclass(x->x_arrayname_dst, garray_class)))
pd_error(x, "%s: no such array", x->x_arrayname_dst->s_name);
else if (!garray_getfloatwords(a_dst, &npoints_dst, &vec_dst))
pd_error(x, "%s: bad template for tab_downsample", x->x_arrayname_dst->s_name);
else
{
nb_max = MIN((npoints_src - x->offset)/x->factor, npoints_dst);
// post("nb_max = %d",nb_max);
index_src = x->offset;
for (i=0; i<nb_max;i++) {
vec_dst[i].w_float = vec_src[index_src].w_float;
index_src += x->factor;
}
garray_redraw(a_dst);
}
outlet_bang(x->b_out);
}
void tab_downsample_bang(t_tab_downsample *x)
{
x->offset = 0;
tab_downsample_compute(x) ;
}
void tab_downsample_float(t_tab_downsample *x, t_float offset)
{
x->offset = offset;
tab_downsample_compute(x) ;
}
void tab_downsample_src(t_tab_downsample *x, t_symbol *s_src) {
x->x_arrayname_src = s_src;
}
void tab_downsample_dst(t_tab_downsample *x, t_symbol *s_dst) {
x->x_arrayname_dst = s_dst;
}
void tab_downsample_factor(t_tab_downsample *x, t_float factor) {
x->factor = factor;
}
void tab_downsample_setup(void) {
tab_downsample_class = class_new(gensym("tab_downsample"), (t_newmethod)tab_downsample_new,
0, sizeof(t_tab_downsample), CLASS_DEFAULT, A_DEFSYM, A_DEFSYM, A_DEFFLOAT, 0);
class_addbang(tab_downsample_class, tab_downsample_bang);
class_addmethod(tab_downsample_class, (t_method)tab_downsample_src, gensym("src"), A_DEFSYM, 0);
class_addmethod(tab_downsample_class, (t_method)tab_downsample_dst, gensym("dst"), A_DEFSYM, 0);
class_addmethod(tab_downsample_class, (t_method)tab_downsample_factor, gensym("factor"), A_DEFFLOAT, 0);
class_addfloat(tab_downsample_class, (t_method)tab_downsample_float);
}
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