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pcsx2/plugins/PeopsSPU2/xa.c

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/***************************************************************************
xa.c - description
-------------------
begin : Wed May 15 2002
copyright : (C) 2002 by Pete Bernert
email : BlackDove@addcom.de
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. See also the license.txt file for *
* additional informations. *
* *
***************************************************************************/
//*************************************************************************//
// History of changes:
//
// 2003/02/18 - kode54
// - added gaussian interpolation
//
// 2002/05/15 - Pete
// - generic cleanup for the Peops release
//
//*************************************************************************//
#include "stdafx.h"
#define _IN_XA
// will be included from spu.c
#ifdef _IN_SPU
////////////////////////////////////////////////////////////////////////
// XA GLOBALS
////////////////////////////////////////////////////////////////////////
xa_decode_t * xapGlobal=0;
unsigned long * XAFeed = NULL;
unsigned long * XAPlay = NULL;
unsigned long * XAStart = NULL;
unsigned long * XAEnd = NULL;
unsigned long XARepeat = 0;
unsigned long XALastVal = 0;
int iLeftXAVol = 32767;
int iRightXAVol = 32767;
static int gauss_ptr = 0;
static int gauss_window[8] = {0, 0, 0, 0, 0, 0, 0, 0};
#define gvall0 gauss_window[gauss_ptr]
#define gvall(x) gauss_window[(gauss_ptr+x)&3]
#define gvalr0 gauss_window[4+gauss_ptr]
#define gvalr(x) gauss_window[4+((gauss_ptr+x)&3)]
////////////////////////////////////////////////////////////////////////
// MIX XA
////////////////////////////////////////////////////////////////////////
INLINE void MixXA(void)
{
int ns;
for(ns=0;ns<NSSIZE && XAPlay!=XAFeed;ns++)
{
XALastVal=*XAPlay++;
if(XAPlay==XAEnd) XAPlay=XAStart;
SSumL[ns]+=(((short)(XALastVal&0xffff)) * iLeftXAVol)/32767;
SSumR[ns]+=(((short)((XALastVal>>16)&0xffff)) * iRightXAVol)/32767;
}
if(XAPlay==XAFeed && XARepeat)
{
XARepeat--;
for(;ns<NSSIZE;ns++)
{
SSumL[ns]+=(((short)(XALastVal&0xffff)) * iLeftXAVol)/32767;
SSumR[ns]+=(((short)((XALastVal>>16)&0xffff)) * iRightXAVol)/32767;
}
}
}
////////////////////////////////////////////////////////////////////////
// FEED XA
////////////////////////////////////////////////////////////////////////
INLINE void FeedXA(xa_decode_t *xap)
{
int sinc,spos,i,iSize,iPlace,vl,vr;
if(!bSPUIsOpen) return;
xapGlobal = xap; // store info for save states
XARepeat = 100; // set up repeat
iSize=((44100*xap->nsamples)/xap->freq); // get size
if(!iSize) return; // none? bye
if(XAFeed<XAPlay) iPlace=XAPlay-XAFeed; // how much space in my buf?
else iPlace=(XAEnd-XAFeed) + (XAPlay-XAStart);
if(iPlace==0) return; // no place at all
//----------------------------------------------------//
if(iXAPitch) // pitch change option?
{
static DWORD dwLT=0;
static DWORD dwFPS=0;
static int iFPSCnt=0;
static int iLastSize=0;
static DWORD dwL1=0;
DWORD dw=timeGetTime(),dw1,dw2;
iPlace=iSize;
dwFPS+=dw-dwLT;iFPSCnt++;
dwLT=dw;
if(iFPSCnt>=10)
{
if(!dwFPS) dwFPS=1;
dw1=1000000/dwFPS;
if(dw1>=(dwL1-100) && dw1<=(dwL1+100)) dw1=dwL1;
else dwL1=dw1;
dw2=(xap->freq*100/xap->nsamples);
if((!dw1)||((dw2+100)>=dw1)) iLastSize=0;
else
{
iLastSize=iSize*dw2/dw1;
if(iLastSize>iPlace) iLastSize=iPlace;
iSize=iLastSize;
}
iFPSCnt=0;dwFPS=0;
}
else
{
if(iLastSize) iSize=iLastSize;
}
}
//----------------------------------------------------//
spos=0x10000L;
sinc = (xap->nsamples << 16) / iSize; // calc freq by num / size
if(xap->stereo)
{
unsigned long * pS=(unsigned long *)xap->pcm;
unsigned long l=0;
if(iXAPitch)
{
long l1,l2;short s;
for(i=0;i<iSize;i++)
{
if(iUseInterpolation==2)
{
while(spos>=0x10000L)
{
l = *pS++;
gauss_window[gauss_ptr] = (short)LOWORD(l);
gauss_window[4+gauss_ptr] = (short)HIWORD(l);
gauss_ptr = (gauss_ptr+1) & 3;
spos -= 0x10000L;
}
vl = (spos >> 6) & ~3;
vr=(gauss[vl]*gvall0)&~2047;
vr+=(gauss[vl+1]*gvall(1))&~2047;
vr+=(gauss[vl+2]*gvall(2))&~2047;
vr+=(gauss[vl+3]*gvall(3))&~2047;
l= (vr >> 11) & 0xffff;
vr=(gauss[vl]*gvalr0)&~2047;
vr+=(gauss[vl+1]*gvalr(1))&~2047;
vr+=(gauss[vl+2]*gvalr(2))&~2047;
vr+=(gauss[vl+3]*gvalr(3))&~2047;
l |= vr << 5;
}
else
{
while(spos>=0x10000L)
{
l = *pS++;
spos -= 0x10000L;
}
}
s=(short)LOWORD(l);
l1=s;
l1=(l1*iPlace)/iSize;
if(l1<-32767) l1=-32767;
if(l1> 32767) l1=32767;
s=(short)HIWORD(l);
l2=s;
l2=(l2*iPlace)/iSize;
if(l2<-32767) l2=-32767;
if(l2> 32767) l2=32767;
l=(l1&0xffff)|(l2<<16);
*XAFeed++=l;
if(XAFeed==XAEnd) XAFeed=XAStart;
if(XAFeed==XAPlay)
{
if(XAPlay!=XAStart) XAFeed=XAPlay-1;
break;
}
spos += sinc;
}
}
else
{
for(i=0;i<iSize;i++)
{
if(iUseInterpolation==2)
{
while(spos>=0x10000L)
{
l = *pS++;
gauss_window[gauss_ptr] = (short)LOWORD(l);
gauss_window[4+gauss_ptr] = (short)HIWORD(l);
gauss_ptr = (gauss_ptr+1) & 3;
spos -= 0x10000L;
}
vl = (spos >> 6) & ~3;
vr=(gauss[vl]*gvall0)&~2047;
vr+=(gauss[vl+1]*gvall(1))&~2047;
vr+=(gauss[vl+2]*gvall(2))&~2047;
vr+=(gauss[vl+3]*gvall(3))&~2047;
l= (vr >> 11) & 0xffff;
vr=(gauss[vl]*gvalr0)&~2047;
vr+=(gauss[vl+1]*gvalr(1))&~2047;
vr+=(gauss[vl+2]*gvalr(2))&~2047;
vr+=(gauss[vl+3]*gvalr(3))&~2047;
l |= vr << 5;
}
else
{
while(spos>=0x10000L)
{
l = *pS++;
spos -= 0x10000L;
}
}
*XAFeed++=l;
if(XAFeed==XAEnd) XAFeed=XAStart;
if(XAFeed==XAPlay)
{
if(XAPlay!=XAStart) XAFeed=XAPlay-1;
break;
}
spos += sinc;
}
}
}
else
{
unsigned short * pS=(unsigned short *)xap->pcm;
unsigned long l;short s=0;
if(iXAPitch)
{
long l1;
for(i=0;i<iSize;i++)
{
if(iUseInterpolation==2)
{
while(spos>=0x10000L)
{
gauss_window[gauss_ptr] = (short)*pS++;
gauss_ptr = (gauss_ptr+1) & 3;
spos -= 0x10000L;
}
vl = (spos >> 6) & ~3;
vr=(gauss[vl]*gvall0)&~2047;
vr+=(gauss[vl+1]*gvall(1))&~2047;
vr+=(gauss[vl+2]*gvall(2))&~2047;
vr+=(gauss[vl+3]*gvall(3))&~2047;
l1=s= vr >> 11;
l1 &= 0xffff;
}
else
{
while(spos>=0x10000L)
{
s = *pS++;
spos -= 0x10000L;
}
l1=s;
}
l1=(l1*iPlace)/iSize;
if(l1<-32767) l1=-32767;
if(l1> 32767) l1=32767;
l=(l1&0xffff)|(l1<<16);
*XAFeed++=l;
if(XAFeed==XAEnd) XAFeed=XAStart;
if(XAFeed==XAPlay)
{
if(XAPlay!=XAStart) XAFeed=XAPlay-1;
break;
}
spos += sinc;
}
}
else
{
for(i=0;i<iSize;i++)
{
if(iUseInterpolation==2)
{
while(spos>=0x10000L)
{
gauss_window[gauss_ptr] = (short)*pS++;
gauss_ptr = (gauss_ptr+1) & 3;
spos -= 0x10000L;
}
vl = (spos >> 6) & ~3;
vr=(gauss[vl]*gvall0)&~2047;
vr+=(gauss[vl+1]*gvall(1))&~2047;
vr+=(gauss[vl+2]*gvall(2))&~2047;
vr+=(gauss[vl+3]*gvall(3))&~2047;
l=s= vr >> 11;
l &= 0xffff;
}
else
{
while(spos>=0x10000L)
{
s = *pS++;
spos -= 0x10000L;
}
l=s;
}
*XAFeed++=(l|(l<<16));
if(XAFeed==XAEnd) XAFeed=XAStart;
if(XAFeed==XAPlay)
{
if(XAPlay!=XAStart) XAFeed=XAPlay-1;
break;
}
spos += sinc;
}
}
}
}
#endif
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