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#include "defines.h"
/*--------------- prevl ---------------*/
static t_class *prevl_class;
typedef struct _prevl
{
t_object x_obj;
float m_lo;
float m_hi;
int m_buffer_size;
int m_buffer_index;
float *m_buffer; // circular buffer
} t_prevl;
static void prevl_perform_float(t_prevl *x, t_float f)
{
int index;
index=x->m_buffer_index+1;
index=(index==x->m_buffer_size)?0:index;
x->m_buffer_index=index;
x->m_buffer[index]=f;
}
static void prevl_bang(t_prevl *x)
{
int lo,hi,n,index,size;
t_atom *ap,*app;
float *buffer, *bp;
lo=(int)x->m_lo;
hi=(int)x->m_hi;
n=hi-lo;
size=x->m_buffer_size;
index=x->m_buffer_index;
ap = (t_atom *)getbytes(sizeof(t_atom)*n);
app=ap;
buffer=x->m_buffer;
bp=buffer+index-lo;
bp=(bp>=buffer)?bp:bp+size; // wrap
if (bp-buffer>=n)
{ // no wrap-around needed
index=n;
while(index--){
SETFLOAT(app, *bp--);
app++;
}
// post("not wrapped, app-ap=%i",app-ap);
}
else // need to wrap
{
int ps, nn;
ps = bp-buffer;
nn=n;
// post(" nn=%i",nn);
for(;ps>=0;ps--) // don't we miss one sample in signal???
{
// post("ps=%i",ps);
SETFLOAT(app, buffer[ps]);
app++;
nn--;
}
ps=size-1;
// post(" nn=%i",nn);
for(;nn>0;nn--)
{
// post("ps=%i",ps);
SETFLOAT(app, buffer[ps--]);
app++;
}
}
outlet_list(x->x_obj.ob_outlet,gensym("list"),n,ap);
freebytes(ap, sizeof(t_atom)*n);
}
static void prevl_clear(t_prevl *x)
{
int i,s;
float *f;
f=x->m_buffer;
s=x->m_buffer_size;
for (i=0;i<s;i++)
*f++=0.0f;
}
static void prevl_set(t_prevl *x, t_float lo, t_float hi, t_float size)
{
if (size<1)
{
size=1;
post("prevl: size is minimum 1...");
}
if (hi>size)
{
post("prevl: higher bound cannot be higher than the buffer size...");
hi=size;
}
if (lo<0)
{
post("prevl: lower bound cannot be negative...");
lo=0;
}
if (hi<1)
{
post("prevl: higher bound cannot be smaller than one...");
hi=1;
}
if (hi<=lo)
{
post("prevl: higher bound must be higher than lower bound...");
lo=hi-1.0f;
}
freebytes(x->m_buffer, x->m_buffer_size);
x->m_hi=(float)((int)hi);
x->m_lo=(float)((int)lo);
x->m_buffer_size=(int)size;
x->m_buffer = (float*)getbytes(sizeof(float)*x->m_buffer_size);
prevl_clear(x);
x->m_buffer_index=0;
}
static void *prevl_new(t_float lo, t_float hi, t_float size)
{
t_prevl *x=(t_prevl *)pd_new(prevl_class);
outlet_new(&x->x_obj, gensym("list"));
x->m_buffer_size=0;
x->m_buffer=0;
prevl_set(x, lo, hi, size);
floatinlet_new(&x->x_obj, &x->m_lo);
floatinlet_new(&x->x_obj, &x->m_hi);
return (void *)x;
}
static void prevl_free(t_prevl *x)
{
freebytes(x->m_buffer, x->m_buffer_size);
}
void prevl_setup(void)
{
prevl_class = class_new(gensym("prevl"),
(t_newmethod)prevl_new, (t_method)prevl_free,
sizeof(t_prevl),
CLASS_DEFAULT,
A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT,0);
class_addmethod(prevl_class, (t_method)prevl_clear, gensym("clear"),0);
class_addfloat(prevl_class, (t_method)prevl_perform_float);
class_addbang(prevl_class, (t_method)prevl_bang);
}
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