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/*
xsample - extended sample objects for Max/MSP and pd (pure data)
Copyright (c) 2001-2003 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.
*/
#ifndef __INTER_H
#define __INTER_H
TMPLDEF V xinter::st_play0(const S *,const I ,const I ,const I n,const I inchns,const I outchns,S *const *invecs,S *const *outvecs)
{
// stopped/invalid buffer -> output zero
for(I ci = 0; ci < outchns; ++ci) ZeroSamples(outvecs[ci],n);
}
TMPLDEF V xinter::st_play1(const S *bdt,const I smin,const I smax,const I n,const I inchns,const I outchns,S *const *invecs,S *const *outvecs)
{
SIGCHNS(BCHNS,inchns,OCHNS,outchns);
// position info are frame units
const S *pos = invecs[0];
S *const *sig = outvecs;
register I si = 0;
// no interpolation
// ----------------
for(I i = 0; i < n; ++i,++si) {
register const I oint = (I)(*(pos++));
register const S *fp;
if(oint < smin) {
// position < 0 ... take only 0th sample
fp = bdt+smin*BCHNS;
}
else if(oint >= smax) {
// position > last sample ... take only last sample
fp = bdt+(smax-1)*BCHNS;
}
else {
// normal
fp = bdt+oint*BCHNS;
}
for(I ci = 0; ci < OCHNS; ++ci)
sig[ci][si] = fp[ci];
}
// clear rest of output channels (if buffer has less channels)
for(I ci = OCHNS; ci < outchns; ++ci) ZeroSamples(sig[ci],n);
}
TMPLDEF V xinter::st_play2(const S *bdt,const I smin,const I smax,const I n,const I inchns,const I outchns,S *const *invecs,S *const *outvecs)
{
const I plen = smax-smin; //curlen;
if(plen < 2) {
st_play1 TMPLCALL (bdt,smin,smax,n,inchns,outchns,invecs,outvecs);
return;
}
SIGCHNS(BCHNS,inchns,OCHNS,outchns);
// position info are frame units
const S *pos = invecs[0];
S *const *sig = outvecs;
register I si = 0;
// linear interpolation
// --------------------
const I maxo = smax-1; // last sample in buffer
for(I i = 0; i < n; ++i,++si) {
const F o = *(pos++);
register const I oint = (I)o;
if(oint < smin) {
// position is before first sample -> take the first sample
register const S *const fp = bdt+smin*BCHNS;
for(I ci = 0; ci < OCHNS; ++ci)
sig[ci][si] = fp[ci];
}
else if(oint >= maxo) {
// position is past last sample -> take the last sample
register const S *const fp = bdt+maxo*BCHNS;
for(I ci = 0; ci < OCHNS; ++ci)
sig[ci][si] = fp[ci];
}
else {
// normal interpolation
register const F frac = o-oint;
register const S *const fp0 = bdt+oint*BCHNS;
register const S *const fp1 = fp0+BCHNS;
for(I ci = 0; ci < OCHNS; ++ci)
sig[ci][si] = fp0[ci]+frac*(fp1[ci]-fp0[ci]);
}
}
// clear rest of output channels (if buffer has less channels)
for(I ci = OCHNS; ci < outchns; ++ci) ZeroSamples(sig[ci],n);
}
TMPLDEF V xinter::st_play4(const S *bdt,const I smin,const I smax,const I n,const I inchns,const I outchns,S *const *invecs,S *const *outvecs)
{
const I plen = smax-smin; //curlen;
if(plen < 4) {
if(plen < 2) st_play1 TMPLCALL (bdt,smin,smax,n,inchns,outchns,invecs,outvecs);
else st_play2 TMPLCALL (bdt,smin,smax,n,inchns,outchns,invecs,outvecs);
return;
}
SIGCHNS(BCHNS,inchns,OCHNS,outchns);
// position info are frame units
const S *pos = invecs[0];
S *const *sig = outvecs;
register I si = 0;
// 4-point interpolation
// ---------------------
const I maxo = smax-1; // last sample in play region
for(I i = 0; i < n; ++i,++si) {
F o = *(pos++);
register I oint = (I)o,ointm,oint1,oint2;
if(oint <= smin) {
if(oint < smin) oint = smin,o = smin;
// position is first simple
ointm = smin; // first sample
oint1 = oint+1;
oint2 = oint1+1;
}
else if(oint >= maxo-2) {
if(oint > maxo) oint = maxo,o = smax;
ointm = oint-1;
oint1 = oint >= maxo?maxo:oint+1;
oint2 = oint1 >= maxo?maxo:oint1+1;
}
else {
ointm = oint-1;
oint1 = oint+1;
oint2 = oint1+1;
}
register F frac = o-oint;
register const S *fa = bdt+ointm*BCHNS;
register const S *fb = bdt+oint*BCHNS;
register const S *fc = bdt+oint1*BCHNS;
register const S *fd = bdt+oint2*BCHNS;
for(I ci = 0; ci < OCHNS; ++ci) {
const F cmb = fc[ci]-fb[ci];
sig[ci][si] = fb[ci] + frac*(
cmb - 0.5f*(frac-1.0f) * ((fa[ci]-fd[ci]+3.0f*cmb)*frac + (fb[ci]-fa[ci]-cmb))
);
}
}
// clear rest of output channels (if buffer has less channels)
for(I ci = OCHNS; ci < outchns; ++ci) ZeroSamples(sig[ci],n);
}
TMPLDEF inline V xinter::s_play0(I n,S *const *invecs,S *const *outvecs)
{
st_play0 TMPLCALL (buf->Data(),curmin,curmax,n,buf->Channels(),outchns,invecs,outvecs);
}
TMPLDEF inline V xinter::s_play1(I n,S *const *invecs,S *const *outvecs)
{
st_play1 TMPLCALL (buf->Data(),curmin,curmax,n,buf->Channels(),outchns,invecs,outvecs);
}
TMPLDEF inline V xinter::s_play2(I n,S *const *invecs,S *const *outvecs)
{
st_play2 TMPLCALL (buf->Data(),curmin,curmax,n,buf->Channels(),outchns,invecs,outvecs);
}
TMPLDEF inline V xinter::s_play4(I n,S *const *invecs,S *const *outvecs)
{
st_play4 TMPLCALL (buf->Data(),curmin,curmax,n,buf->Channels(),outchns,invecs,outvecs);
}
#endif
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