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/*
VASP modular - vector assembling signal processor / objects for Max/MSP and PD
Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
#include "ops_wnd.h"
#include "oploop.h"
#include <math.h>
#include <string.h>
#ifndef PI
#define PI 3.1415926535897932384
#endif
// --- window --------------------------
typedef R (*wfunc)(R i,const OpParam &p);
inline R wf_sin(R i,const OpParam &p) { return sin(i*p.wnd.p1+p.wnd.p2); }
inline R wf_hanning(R i,const OpParam &p) { return 0.5*(1+cos(i*p.wnd.p1+p.wnd.p2)); }
inline R wf_hamming(R i,const OpParam &p) { return 0.54 + 0.46 * cos(i*p.wnd.p1+p.wnd.p2); }
inline R wf_blackman(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2; return 0.42+0.5*cos(x)+0.08*cos(2*x); }
inline R wf_connes(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2,x2 = 1-x*x; return x2*x2; }
inline R wf_welch(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2; return 1-x*x; }
inline R wf_lanczos(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2; return x?sin(x)/x:1; }
//inline R wf_gaussian(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2; return pow(2, (-1 * (x / p.wnd.p3) * (x / p.wnd.p3))); }
//inline R wf_kaiser(R i,const OpParam &p) { const R x = i*p.wnd.p1+p.wnd.p2; return i0(p.wnd.p3 * sqrt(1 - (x * x))) / i0(p.wnd.p3); }
static V WndOp(wfunc wf,OpParam &p) {
register I i;
if(!p.wnd.mul) {
register S *dd = p.rddt;
_D_LOOP(i,p.frames) *dd = wf(i,p),dd += p.rds; _E_LOOP
}
else {
register const S *sd = p.rsdt;
register S *dd = p.rddt;
_D_LOOP(i,p.frames) *dd = *sd*wf(i,p),sd += p.rss,dd += p.rds; _E_LOOP
}
}
#define WNDOP(WFUNC,OPP) WndOp(WFUNC,OPP)
BL VecOp::d_window(OpParam &p)
{
// reverse direction?
BL rev = ((p.revdir?1:0)^(p.symm == 1?1:0)^(p.wnd.inv?1:0)) != 0;
// set middle sample (if existent) to 1
if(p.oddrem) p.SkipOddMiddle(1);
switch(p.wnd.wndtp) {
case 0: { // bevel (Bartlett)
register R inc,cur;
inc = (rev?-1.:1.)/p.frames; // increase
cur = rev?(1+inc/2):inc/2; // start
if(!p.wnd.mul) {
register S *dd = p.rddt;
register I i;
if(p.rds == 1)
_D_LOOP(i,p.frames) *(dd++) = cur,cur += inc; _E_LOOP
else
_D_LOOP(i,p.frames) *dd = cur,dd += p.rds,cur += inc; _E_LOOP
}
else {
register const S *sd = p.rsdt;
register S *dd = p.rddt;
register I i;
if(sd == dd)
if(p.rss == 1 && p.rds == 1)
_D_LOOP(i,p.frames) *(dd++) *= cur,cur += inc; _E_LOOP
else
_D_LOOP(i,p.frames) *dd *= cur,dd += p.rds,cur += inc; _E_LOOP
else
if(p.rss == 1 && p.rds == 1)
_D_LOOP(i,p.frames) *(dd++) = *(sd++) * cur,cur += inc; _E_LOOP
else
_D_LOOP(i,p.frames) *dd = *sd * cur,sd += p.rss,dd += p.rds,cur += inc; _E_LOOP
}
break;
}
case 1: { // sine
p.wnd.p1 = (PI/2)/p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?PI/2:0);
WNDOP(wf_sin,p);
break;
}
case 2: { // Hanning
p.wnd.p1 = PI/p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?0:PI);
WNDOP(wf_hanning,p);
break;
}
case 3: { // Hamming
p.wnd.p1 = PI/p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?0:PI);
WNDOP(wf_hamming,p);
break;
}
case 4: { // Blackman
p.wnd.p1 = PI/p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?0:PI);
WNDOP(wf_blackman,p);
break;
}
case 5: { // Connes (xxx)
p.wnd.p1 = 1./p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?1:0);
WNDOP(wf_connes,p);
break;
}
case 6: { // Welch (xxx)
p.wnd.p1 = 1./p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?1:0);
WNDOP(wf_welch,p);
break;
}
case 7: { // Lanczos (xxx)
p.wnd.p1 = PI/p.frames;
p.wnd.p2 = p.wnd.p1/2+(rev?0:PI);
WNDOP(wf_lanczos,p);
break;
}
default: {
post("%s: Window function #%i not known",p.opname,p.wnd.wndtp);
return false;
}
}
return true;
}
Vasp *VaspOp::m_window(OpParam &p,CVasp &src,const Argument &arg,CVasp *dst,BL inv,BL mul,BL symm)
{
static const int wndnum = 8;
static const char *wndtps[wndnum] = {"lin","sin","hanning","hamming","blackman","connes","welch","lanczos" /*,"gaussian","kaiser"*/};
Vasp *ret = NULL;
RVecBlock *vecs = GetRVecs(p.opname,src,dst);
if(vecs) {
p.wnd.wndtp = -1;
if(arg.IsList() && arg.GetList().Count() >= 1) {
// window mode
const flext::AtomList &l = arg.GetList();
if(flext::IsSymbol(l[0])) {
I i;
const C *s = flext::GetString(l[0]);
p.wnd.wndtp = -1;
for(i = 0; i < wndnum; ++i)
if(!strcmp(wndtps[i],s)) { p.wnd.wndtp = i; break; }
}
else if(flext::CanbeInt(l[0])) {
p.wnd.wndtp = flext::GetAInt(l[0]);
}
else p.wnd.wndtp = -1;
}
if(p.wnd.wndtp < 0) {
post("%s - invalid window type - using lin",p.opname);
p.wnd.wndtp = 0;
}
p.wnd.inv = inv;
p.wnd.mul = mul;
ret = DoOp(vecs,VecOp::d_window,p,symm);
delete vecs;
}
return ret;
}
VASP_ANYOP("vasp.window vasp.wnd",window,0,false,VASP_ARG(),"Sets target vasp to window function")
VASP_ANYOP("vasp.*window vasp.*wnd",mwindow,0,true,VASP_ARG(),"Multiplies a vasp by window function")
VASP_ANYOP("vasp.!window vasp.!wnd",iwindow,0,false,VASP_ARG(),"Sets target vasp to reverse window function")
VASP_ANYOP("vasp.*!window vasp.!wnd",miwindow,0,true,VASP_ARG(),"Multiplies a vasp by reverse window function")
VASP_ANYOP("vasp.xwindow vasp.xwnd",xwindow,0,false,VASP_ARG(),"Sets target vasp to symmetrical window function")
VASP_ANYOP("vasp.*xwindow vasp.*xwnd",mxwindow,0,true,VASP_ARG(),"Multiplies a vasp by symmetrical window function")
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