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#include "defines.h"
/*--------------- deltas ---------------*/
static t_class *deltas_class;
typedef struct _deltas
{
t_object x_obj;
t_float m_lo;
t_float m_hi;
int m_buffer_size;
int m_buffer_index;
t_float *m_buffer; // circular buffer
} t_deltas;
static void deltas_set(t_deltas *x, t_float lo, t_float hi, t_float size);
static void deltas_perform_float(t_deltas *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 deltas_bang(t_deltas *x)
{
int lo,hi,n,index,size;
t_atom *ap,*app;
t_float last;
t_float *buffer, *bp;
deltas_set(x, x->m_lo, x->m_hi, x->m_buffer_size);
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;
last=buffer[index];
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, last-*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, last-buffer[ps]);
app++;
nn--;
}
ps=size-1;
// post(" nn=%i",nn);
for(;nn>0;nn--)
{
// post("ps=%i",ps);
SETFLOAT(app, last-buffer[ps--]);
app++;
}
/*
int i2;
index=bp-buffer;
i2=index;
post("first part %i",index);
while(index--){
SETFLOAT(app, last-*bp--);
app++;
}
index=n-i2;
post("2nd part %i",index);
bp=buffer+size-1;
while(index--){
SETFLOAT(app, last-*bp--);
app++;
}
*/
// post("wrapped, app-ap=%i",app-ap);
}
outlet_list(x->x_obj.ob_outlet,gensym("list"),n,ap);
freebytes(ap, sizeof(t_atom)*n);
}
static void deltas_clear(t_deltas *x)
{
int i,s;
t_float *f;
f=x->m_buffer;
s=x->m_buffer_size;
for (i=0;i<s;i++)
*f++=0.0;
}
static void deltas_set(t_deltas *x, t_float lo, t_float hi, t_float size)
{
if (size<1)
{
size=1;
logpost(x, 2, "[deltas]: minimum size is 1");
}
if (hi>size)
{
logpost(x, 2, "[deltas]: higher bound (%g) cannot be greater than the buffer size (%g)",
hi, size);
hi=size;
}
if (lo<0)
{
logpost(x, 2, "[deltas]: lower bound cannot be negative");
lo=0;
}
if (hi<1)
{
logpost(x, 2, "[deltas]: higher bound cannot be smaller than one");
hi=1;
}
if (hi<=lo)
{
logpost(x, 2, "[deltas]: higher bound (%g) must be greater than lower bound (%g)", hi, lo);
lo=hi-1.0;
}
x->m_hi=(t_float)((int)hi);
x->m_lo=(t_float)((int)lo);
if (x->m_buffer_size != size)
{
freebytes(x->m_buffer, x->m_buffer_size);
x->m_buffer_size = (int)size;
x->m_buffer = (t_float*)getbytes(sizeof(t_float)*x->m_buffer_size);
deltas_clear(x);
x->m_buffer_index=0;
}
}
static void *deltas_new(t_float lo, t_float hi, t_float size)
{
t_deltas *x=(t_deltas *)pd_new(deltas_class);
outlet_new(&x->x_obj, gensym("list"));
x->m_buffer_size=0;
x->m_buffer=0;
deltas_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 deltas_free(t_deltas *x)
{
freebytes(x->m_buffer, x->m_buffer_size);
}
void deltas_setup(void)
{
deltas_class = class_new(gensym("deltas"),
(t_newmethod)deltas_new, (t_method)deltas_free,
sizeof(t_deltas),
CLASS_DEFAULT,
A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT,0);
class_addmethod(deltas_class, (t_method)deltas_clear, gensym("clear"),0);
class_addfloat(deltas_class, (t_method)deltas_perform_float);
class_addbang(deltas_class, (t_method)deltas_bang);
}
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