adplug plugin WIP (insert works)

1 files changed, 600 insertions, 0 deletions

diff --git a/plugins/adplug/adplug/adlibemu.c b/plugins/adplug/adplug/adlibemu.c
new file mode 100644
index 00000000..c35d6da7
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+++ b/plugins/adplug/adplug/adlibemu.c
@@ -0,0 +1,600 @@
+/*
+ * ADLIBEMU.C
+ * Copyright (C) 1998-2001 Ken Silverman
+ * Ken Silverman's official web site: "http://www.advsys.net/ken"
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/*
+This file is a digital Adlib emulator for OPL2 and possibly OPL3
+
+Features that could be added in a future version:
+- Amplitude and Frequency Vibrato Bits (not hard, but a big speed hit)
+- Global Keyboard Split Number Bit (need to research this one some more)
+- 2nd Adlib chip for OPL3 (simply need to make my cell array bigger)
+- Advanced connection modes of OPL3 (Just need to add more "docell" cases)
+- L/R Stereo bits of OPL3 (Need adlibgetsample to return stereo)
+
+Features that aren't worth supporting:
+- Anything related to adlib timers&interrupts (Sorry - I always used IRQ0)
+- Composite sine wave mode (CSM) (Supported only on ancient cards)
+
+I'm not sure about a few things in my code:
+- Attack curve.  What function is this anyway?  I chose to use an order-3
+  polynomial to approximate but this doesn't seem right.
+- Attack/Decay/Release constants - my constants may not be exact
+- What should ADJUSTSPEED be?
+- Haven't verified that Global Keyboard Split Number Bit works yet
+- Some of the drums don't always sound right.  It's pretty hard to guess
+  the exact waveform of drums when you look at random data which is
+  slightly randomized due to digital ADC recording.
+- Adlib seems to have a lot more treble than my emulator does.  I'm not
+  sure if this is simply unfixable due to the sound blaster's different
+  filtering on FM and digital playback or if it's a serious bug in my
+  code.
+*/
+
+#include <math.h>
+#include <string.h>
+
+#if !defined(max) && !defined(__cplusplus)
+#define max(a,b)  (((a) > (b)) ? (a) : (b))
+#endif
+#if !defined(min) && !defined(__cplusplus)
+#define min(a,b)  (((a) < (b)) ? (a) : (b))
+#endif
+
+#define PI 3.141592653589793
+#define MAXCELLS 18
+#define WAVPREC 2048
+
+static float AMPSCALE=(8192.0);
+#define FRQSCALE (49716/512.0)
+
+//Constants for Ken's Awe32, on a PII-266 (Ken says: Use these for KSM's!)
+#define MODFACTOR 4.0      //How much of modulator cell goes into carrier
+#define MFBFACTOR 1.0      //How much feedback goes back into modulator
+#define ADJUSTSPEED 0.75   //0<=x<=1  Simulate finite rate of change of state
+
+//Constants for Ken's Awe64G, on a P-133
+//#define MODFACTOR 4.25   //How much of modulator cell goes into carrier
+//#define MFBFACTOR 0.5    //How much feedback goes back into modulator
+//#define ADJUSTSPEED 0.85 //0<=x<=1  Simulate finite rate of change of state
+
+typedef struct
+{
+    float val, t, tinc, vol, sustain, amp, mfb;
+    float a0, a1, a2, a3, decaymul, releasemul;
+    short *waveform;
+    long wavemask;
+    void (*cellfunc)(void *, float);
+    unsigned char flags, dum0, dum1, dum2;
+} celltype;
+
+static long numspeakers, bytespersample;
+static float recipsamp;
+static celltype cell[MAXCELLS];
+static signed short wavtable[WAVPREC*3];
+static float kslmul[4] = {0.0,0.5,0.25,1.0};
+static float frqmul[16] = {.5,1,2,3,4,5,6,7,8,9,10,10,12,12,15,15}, nfrqmul[16];
+static unsigned char adlibreg[256], ksl[8][16];
+static unsigned char modulatorbase[9] = {0,1,2,8,9,10,16,17,18};
+static unsigned char odrumstat = 0;
+static unsigned char base2cell[22] = {0,1,2,0,1,2,0,0,3,4,5,3,4,5,0,0,6,7,8,6,7,8};
+
+float lvol[9] = {1,1,1,1,1,1,1,1,1};  //Volume multiplier on left speaker
+float rvol[9] = {1,1,1,1,1,1,1,1,1};  //Volume multiplier on right speaker
+long lplc[9] = {0,0,0,0,0,0,0,0,0};   //Samples to delay on left speaker
+long rplc[9] = {0,0,0,0,0,0,0,0,0};   //Samples to delay on right speaker
+
+long nlvol[9], nrvol[9];
+long nlplc[9], nrplc[9];
+long rend = 0;
+#define FIFOSIZ 256
+static float *rptr[9], *nrptr[9];
+static float rbuf[9][FIFOSIZ*2];
+static float snd[FIFOSIZ*2];
+
+#ifndef USING_ASM
+#define _inline
+#endif
+
+#ifdef USING_ASM
+static _inline void ftol (float f, long *a)
+{
+    _asm
+	{
+	    mov eax, a
+		fld f
+		fistp dword ptr [eax]
+		}
+}
+#else
+static void ftol(float f, long *a) {
+    *a=f;
+}
+#endif
+
+#define ctc ((celltype *)c)      //A rare attempt to make code easier to read!
+void docell4 (void *c, float modulator) { }
+void docell3 (void *c, float modulator)
+{
+    long i;
+
+    ftol(ctc->t+modulator,&i);
+    ctc->t += ctc->tinc;
+    ctc->val += (ctc->amp*ctc->vol*((float)ctc->waveform[i&ctc->wavemask])-ctc->val)*ADJUSTSPEED;
+}
+void docell2 (void *c, float modulator)
+{
+    long i;
+
+    ftol(ctc->t+modulator,&i);
+
+    if (*(long *)&ctc->amp <= 0x37800000)
+    {
+	ctc->amp = 0;
+	ctc->cellfunc = docell4;
+    }
+    ctc->amp *= ctc->releasemul;
+
+    ctc->t += ctc->tinc;
+    ctc->val += (ctc->amp*ctc->vol*((float)ctc->waveform[i&ctc->wavemask])-ctc->val)*ADJUSTSPEED;
+}
+void docell1 (void *c, float modulator)
+{
+    long i;
+
+    ftol(ctc->t+modulator,&i);
+
+    if ((*(long *)&ctc->amp) <= (*(long *)&ctc->sustain))
+    {
+	if (ctc->flags&32)
+	{
+	    ctc->amp = ctc->sustain;
+	    ctc->cellfunc = docell3;
+	}
+	else
+	    ctc->cellfunc = docell2;
+    }
+    else
+	ctc->amp *= ctc->decaymul;
+
+    ctc->t += ctc->tinc;
+    ctc->val += (ctc->amp*ctc->vol*((float)ctc->waveform[i&ctc->wavemask])-ctc->val)*ADJUSTSPEED;
+}
+void docell0 (void *c, float modulator)
+{
+    long i;
+
+    ftol(ctc->t+modulator,&i);
+
+    ctc->amp = ((ctc->a3*ctc->amp + ctc->a2)*ctc->amp + ctc->a1)*ctc->amp + ctc->a0;
+    if ((*(long *)&ctc->amp) > 0x3f800000)
+    {
+	ctc->amp = 1;
+	ctc->cellfunc = docell1;
+    }
+
+    ctc->t += ctc->tinc;
+    ctc->val += (ctc->amp*ctc->vol*((float)ctc->waveform[i&ctc->wavemask])-ctc->val)*ADJUSTSPEED;
+}
+
+
+static long waveform[8] = {WAVPREC,WAVPREC>>1,WAVPREC,(WAVPREC*3)>>2,0,0,(WAVPREC*5)>>2,WAVPREC<<1};
+static long wavemask[8] = {WAVPREC-1,WAVPREC-1,(WAVPREC>>1)-1,(WAVPREC>>1)-1,WAVPREC-1,((WAVPREC*3)>>2)-1,WAVPREC>>1,WAVPREC-1};
+static long wavestart[8] = {0,WAVPREC>>1,0,WAVPREC>>2,0,0,0,WAVPREC>>3};
+static float attackconst[4] = {1/2.82624,1/2.25280,1/1.88416,1/1.59744};
+static float decrelconst[4] = {1/39.28064,1/31.41608,1/26.17344,1/22.44608};
+void cellon (long i, long j, celltype *c, unsigned char iscarrier)
+{
+    long frn, oct, toff;
+    float f;
+
+    frn = ((((long)adlibreg[i+0xb0])&3)<<8) + (long)adlibreg[i+0xa0];
+    oct = ((((long)adlibreg[i+0xb0])>>2)&7);
+    toff = (oct<<1) + ((frn>>9)&((frn>>8)|(((adlibreg[8]>>6)&1)^1)));
+    if (!(adlibreg[j+0x20]&16)) toff >>= 2;
+
+    f = pow(2.0,(adlibreg[j+0x60]>>4)+(toff>>2)-1)*attackconst[toff&3]*recipsamp;
+    c->a0 = .0377*f; c->a1 = 10.73*f+1; c->a2 = -17.57*f; c->a3 = 7.42*f;
+    f = -7.4493*decrelconst[toff&3]*recipsamp;
+    c->decaymul = pow(2.0,f*pow(2.0,(adlibreg[j+0x60]&15)+(toff>>2)));
+    c->releasemul = pow(2.0,f*pow(2.0,(adlibreg[j+0x80]&15)+(toff>>2)));
+    c->wavemask = wavemask[adlibreg[j+0xe0]&7];
+    c->waveform = &wavtable[waveform[adlibreg[j+0xe0]&7]];
+    if (!(adlibreg[1]&0x20)) c->waveform = &wavtable[WAVPREC];
+    c->t = wavestart[adlibreg[j+0xe0]&7];
+    c->flags = adlibreg[j+0x20];
+    c->cellfunc = docell0;
+    c->tinc = (float)(frn<<oct)*nfrqmul[adlibreg[j+0x20]&15];
+    c->vol = pow(2.0,((float)(adlibreg[j+0x40]&63) +
+		      (float)kslmul[adlibreg[j+0x40]>>6]*ksl[oct][frn>>6]) * -.125 - 14);
+    c->sustain = pow(2.0,(float)(adlibreg[j+0x80]>>4) * -.5);
+    if (!iscarrier) c->amp = 0;
+    c->mfb = pow(2.0,((adlibreg[i+0xc0]>>1)&7)+5)*(WAVPREC/2048.0)*MFBFACTOR;
+    if (!(adlibreg[i+0xc0]&14)) c->mfb = 0;
+    c->val = 0;
+}
+
+//This function (and bug fix) written by Chris Moeller
+void cellfreq (signed long i, signed long j, celltype *c)
+{
+    long frn, oct;
+
+    frn = ((((long)adlibreg[i+0xb0])&3)<<8) + (long)adlibreg[i+0xa0];
+    oct = ((((long)adlibreg[i+0xb0])>>2)&7);
+
+    c->tinc = (float)(frn<<oct)*nfrqmul[adlibreg[j+0x20]&15];
+    c->vol = pow(2.0,((float)(adlibreg[j+0x40]&63) +
+		      (float)kslmul[adlibreg[j+0x40]>>6]*ksl[oct][frn>>6]) * -.125 - 14);
+}
+
+static long initfirstime = 0;
+void adlibinit (long dasamplerate, long danumspeakers, long dabytespersample)
+{
+    long i, j, frn, oct;
+
+    memset((void *)adlibreg,0,sizeof(adlibreg));
+    memset((void *)cell,0,sizeof(celltype)*MAXCELLS);
+    memset((void *)rbuf,0,sizeof(rbuf));
+    rend = 0; odrumstat = 0;
+
+    for(i=0;i<MAXCELLS;i++)
+    {
+	cell[i].cellfunc = docell4;
+	cell[i].amp = 0;
+	cell[i].vol = 0;
+	cell[i].t = 0;
+	cell[i].tinc = 0;
+	cell[i].wavemask = 0;
+	cell[i].waveform = &wavtable[WAVPREC];
+    }
+
+    numspeakers = danumspeakers;
+    bytespersample = dabytespersample;
+
+    recipsamp = 1.0 / (float)dasamplerate;
+    for(i=15;i>=0;i--) nfrqmul[i] = frqmul[i]*recipsamp*FRQSCALE*(WAVPREC/2048.0);
+
+    if (!initfirstime)
+    {
+	initfirstime = 1;
+
+	for(i=0;i<(WAVPREC>>1);i++)
+	{
+	    wavtable[i] =
+		wavtable[(i<<1)  +WAVPREC] = (signed short)(16384*sin((float)((i<<1)  )*PI*2/WAVPREC));
+	    wavtable[(i<<1)+1+WAVPREC] = (signed short)(16384*sin((float)((i<<1)+1)*PI*2/WAVPREC));
+	}
+	for(i=0;i<(WAVPREC>>3);i++)
+	{
+	    wavtable[i+(WAVPREC<<1)] = wavtable[i+(WAVPREC>>3)]-16384;
+	    wavtable[i+((WAVPREC*17)>>3)] = wavtable[i+(WAVPREC>>2)]+16384;
+	}
+
+	//[table in book]*8/3
+	ksl[7][0] = 0; ksl[7][1] = 24; ksl[7][2] = 32; ksl[7][3] = 37;
+	ksl[7][4] = 40; ksl[7][5] = 43; ksl[7][6] = 45; ksl[7][7] = 47;
+	ksl[7][8] = 48; for(i=9;i<16;i++) ksl[7][i] = i+41;
+	for(j=6;j>=0;j--)
+	    for(i=0;i<16;i++)
+	    {
+		oct = (long)ksl[j+1][i]-8; if (oct < 0) oct = 0;
+		ksl[j][i] = (unsigned char)oct;
+	    }
+    }
+    else
+    {
+	for(i=0;i<9;i++)
+	{
+	    frn = ((((long)adlibreg[i+0xb0])&3)<<8) + (long)adlibreg[i+0xa0];
+	    oct = ((((long)adlibreg[i+0xb0])>>2)&7);
+	    cell[i].tinc = (float)(frn<<oct)*nfrqmul[adlibreg[modulatorbase[i]+0x20]&15];
+	}
+    }
+}
+
+void adlib0 (long i, long v)
+{
+    unsigned char tmp = adlibreg[i];
+    adlibreg[i] = v;
+
+    if (i == 0xbd)
+    {
+	if ((v&16) > (odrumstat&16)) //BassDrum
+	{
+	    cellon(6,16,&cell[6],0);
+	    cellon(6,19,&cell[15],1);
+	    cell[15].vol *= 2;
+	}
+	if ((v&8) > (odrumstat&8)) //Snare
+	{
+	    cellon(16,20,&cell[16],0);
+	    cell[16].tinc *= 2*(nfrqmul[adlibreg[17+0x20]&15] / nfrqmul[adlibreg[20+0x20]&15]);
+	    if (((adlibreg[20+0xe0]&7) >= 3) && ((adlibreg[20+0xe0]&7) <= 5)) cell[16].vol = 0;
+	    cell[16].vol *= 2;
+	}
+	if ((v&4) > (odrumstat&4)) //TomTom
+	{
+	    cellon(8,18,&cell[8],0);
+	    cell[8].vol *= 2;
+	}
+	if ((v&2) > (odrumstat&2)) //Cymbal
+	{
+	    cellon(17,21,&cell[17],0);
+
+	    cell[17].wavemask = wavemask[5];
+	    cell[17].waveform = &wavtable[waveform[5]];
+	    cell[17].tinc *= 16; cell[17].vol *= 2;
+
+	    //cell[17].waveform = &wavtable[WAVPREC]; cell[17].wavemask = 0;
+	    //if (((adlibreg[21+0xe0]&7) == 0) || ((adlibreg[21+0xe0]&7) == 6))
+	    //   cell[17].waveform = &wavtable[(WAVPREC*7)>>2];
+	    //if (((adlibreg[21+0xe0]&7) == 2) || ((adlibreg[21+0xe0]&7) == 3))
+	    //   cell[17].waveform = &wavtable[(WAVPREC*5)>>2];
+	}
+	if ((v&1) > (odrumstat&1)) //Hihat
+	{
+	    cellon(7,17,&cell[7],0);
+	    if (((adlibreg[17+0xe0]&7) == 1) || ((adlibreg[17+0xe0]&7) == 4) ||
+		((adlibreg[17+0xe0]&7) == 5) || ((adlibreg[17+0xe0]&7) == 7)) cell[7].vol = 0;
+	    if ((adlibreg[17+0xe0]&7) == 6) { cell[7].wavemask = 0; cell[7].waveform = &wavtable[(WAVPREC*7)>>2]; }
+	}
+
+	odrumstat = v;
+    }
+    else if (((unsigned)(i-0x40) < (unsigned)22) && ((i&7) < 6))
+    {
+	if ((i&7) < 3) // Modulator
+	    cellfreq(base2cell[i-0x40],i-0x40,&cell[base2cell[i-0x40]]);
+	else          // Carrier
+	    cellfreq(base2cell[i-0x40],i-0x40,&cell[base2cell[i-0x40]+9]);
+    }
+    else if ((unsigned)(i-0xa0) < (unsigned)9)
+    {
+	cellfreq(i-0xa0,modulatorbase[i-0xa0],&cell[i-0xa0]);
+	cellfreq(i-0xa0,modulatorbase[i-0xa0]+3,&cell[i-0xa0+9]);
+    }
+    else if ((unsigned)(i-0xb0) < (unsigned)9)
+    {
+	if ((v&32) > (tmp&32))
+	{
+	    cellon(i-0xb0,modulatorbase[i-0xb0],&cell[i-0xb0],0);
+	    cellon(i-0xb0,modulatorbase[i-0xb0]+3,&cell[i-0xb0+9],1);
+	}
+	else if ((v&32) < (tmp&32))
+	    cell[i-0xb0].cellfunc = cell[i-0xb0+9].cellfunc = docell2;
+	cellfreq(i-0xb0,modulatorbase[i-0xb0],&cell[i-0xb0]);
+	cellfreq(i-0xb0,modulatorbase[i-0xb0]+3,&cell[i-0xb0+9]);
+    }
+
+    //outdata(i,v);
+}
+
+#ifdef USING_ASM
+static long fpuasm;
+static float fakeadd = 8388608.0+128.0;
+static _inline void clipit8 (float f, long a)
+{
+    _asm
+	{
+	    mov edi, a
+		fld dword ptr f
+		fadd dword ptr fakeadd
+		fstp dword ptr fpuasm
+		mov eax, fpuasm
+		test eax, 0x007fff00
+		jz short skipit
+		shr eax, 16
+		xor eax, -1
+		skipit: mov byte ptr [edi], al
+		}
+}
+
+static _inline void clipit16 (float f, long a)
+{
+    _asm
+	{
+	    mov eax, a
+		fld dword ptr f
+		fist word ptr [eax]
+		cmp word ptr [eax], 0x8000
+		jne short skipit2
+		fst dword ptr [fpuasm]
+		cmp fpuasm, 0x80000000
+		sbb word ptr [eax], 0
+		skipit2: fstp st
+		}
+}
+#else
+static void clipit8(float f,unsigned char *a) {
+    f/=256.0;
+    f+=128.0;
+    if (f>254.5) *a=255;
+    else if (f<0.5) *a=0;
+    else *a=f;
+}
+
+static void clipit16(float f,short *a) {
+    if (f>32766.5) *a=32767;
+    else if (f<-32767.5) *a=-32768;
+    else *a=f;
+}
+#endif
+
+void adlibsetvolume(int i) {
+    AMPSCALE=i;
+}
+
+void adlibgetsample (unsigned char *sndptr, long numbytes)
+{
+    long i, j, k=0, ns, endsamples, rptrs, numsamples;
+    celltype *cptr;
+    float f;
+    short *sndptr2=(short *)sndptr;
+
+    numsamples = (numbytes>>(numspeakers+bytespersample-2));
+
+    if (bytespersample == 1) f = AMPSCALE/256.0; else f = AMPSCALE;
+    if (numspeakers == 1)
+    {
+	nlvol[0] = lvol[0]*f;
+	for(i=0;i<9;i++) rptr[i] = &rbuf[0][0];
+	rptrs = 1;
+    }
+    else
+    {
+	rptrs = 0;
+	for(i=0;i<9;i++)
+	{
+	    if ((!i) || (lvol[i] != lvol[i-1]) || (rvol[i] != rvol[i-1]) ||
+		(lplc[i] != lplc[i-1]) || (rplc[i] != rplc[i-1]))
+	    {
+		nlvol[rptrs] = lvol[i]*f;
+		nrvol[rptrs] = rvol[i]*f;
+		nlplc[rptrs] = rend-min(max(lplc[i],0),FIFOSIZ);
+		nrplc[rptrs] = rend-min(max(rplc[i],0),FIFOSIZ);
+		rptrs++;
+	    }
+	    rptr[i] = &rbuf[rptrs-1][0];
+	}
+    }
+
+
+    //CPU time used to be somewhat less when emulator was only mono!
+    //   Because of no delay fifos!
+
+    for(ns=0;ns<numsamples;ns+=endsamples)
+    {
+	endsamples = min(FIFOSIZ*2-rend,FIFOSIZ);
+	endsamples = min(endsamples,numsamples-ns);
+
+	for(i=0;i<9;i++)
+	    nrptr[i] = &rptr[i][rend];
+	for(i=0;i<rptrs;i++)
+	    memset((void *)&rbuf[i][rend],0,endsamples*sizeof(float));
+
+	if (adlibreg[0xbd]&0x20)
+	{
+				//BassDrum (j=6)
+	    if (cell[15].cellfunc != docell4)
+	    {
+		if (adlibreg[0xc6]&1)
+		{
+		    for(i=0;i<endsamples;i++)
+		    {
+			(cell[15].cellfunc)((void *)&cell[15],0.0);
+			nrptr[6][i] += cell[15].val;
+		    }
+		}
+		else
+		{
+		    for(i=0;i<endsamples;i++)
+		    {
+			(cell[6].cellfunc)((void *)&cell[6],cell[6].val*cell[6].mfb);
+			(cell[15].cellfunc)((void *)&cell[15],cell[6].val*WAVPREC*MODFACTOR);
+			nrptr[6][i] += cell[15].val;
+		    }
+		}
+	    }
+
+				//Snare/Hihat (j=7), Cymbal/TomTom (j=8)
+	    if ((cell[7].cellfunc != docell4) || (cell[8].cellfunc != docell4) || (cell[16].cellfunc != docell4) || (cell[17].cellfunc != docell4))
+	    {
+		for(i=0;i<endsamples;i++)
+		{
+		    k = k*1664525+1013904223;
+		    (cell[16].cellfunc)((void *)&cell[16],k&((WAVPREC>>1)-1)); //Snare
+		    (cell[7].cellfunc)((void *)&cell[7],k&(WAVPREC-1));       //Hihat
+		    (cell[17].cellfunc)((void *)&cell[17],k&((WAVPREC>>3)-1)); //Cymbal
+		    (cell[8].cellfunc)((void *)&cell[8],0.0);                 //TomTom
+		    nrptr[7][i] += cell[7].val + cell[16].val;
+		    nrptr[8][i] += cell[8].val + cell[17].val;
+		}
+	    }
+	}
+	for(j=9-1;j>=0;j--)
+	{
+	    if ((adlibreg[0xbd]&0x20) && (j >= 6) && (j < 9)) continue;
+
+	    cptr = &cell[j]; k = j;
+	    if (adlibreg[0xc0+k]&1)
+	    {
+		if ((cptr[9].cellfunc == docell4) && (cptr->cellfunc == docell4)) continue;
+		for(i=0;i<endsamples;i++)
+		{
+		    (cptr->cellfunc)((void *)cptr,cptr->val*cptr->mfb);
+		    (cptr->cellfunc)((void *)&cptr[9],0);
+		    nrptr[j][i] += cptr[9].val + cptr->val;
+		}
+	    }
+	    else
+	    {
+		if (cptr[9].cellfunc == docell4) continue;
+		for(i=0;i<endsamples;i++)
+		{
+		    (cptr->cellfunc)((void *)cptr,cptr->val*cptr->mfb);
+		    (cptr[9].cellfunc)((void *)&cptr[9],cptr->val*WAVPREC*MODFACTOR);
+		    nrptr[j][i] += cptr[9].val;
+		}
+	    }
+	}
+
+	if (numspeakers == 1)
+	{
+	    if (bytespersample == 1)
+	    {
+		for(i=endsamples-1;i>=0;i--)
+		    clipit8(nrptr[0][i]*nlvol[0],sndptr+1);
+	    }
+	    else
+	    {
+		for(i=endsamples-1;i>=0;i--)
+		    clipit16(nrptr[0][i]*nlvol[0],sndptr2+i);
+	    }
+	}
+	else
+	{
+	    memset((void *)snd,0,endsamples*sizeof(float)*2);
+	    for(j=0;j<rptrs;j++)
+	    {
+		for(i=0;i<endsamples;i++)
+		{
+		    snd[(i<<1)  ] += rbuf[j][(nlplc[j]+i)&(FIFOSIZ*2-1)]*nlvol[j];
+		    snd[(i<<1)+1] += rbuf[j][(nrplc[j]+i)&(FIFOSIZ*2-1)]*nrvol[j];
+		}
+		nlplc[j] += endsamples;
+		nrplc[j] += endsamples;
+	    }
+
+	    if (bytespersample == 1)
+	    {
+		for(i=(endsamples<<1)-1;i>=0;i--)
+		    clipit8(snd[i],sndptr+i);
+	    }
+	    else
+	    {
+		for(i=(endsamples<<1)-1;i>=0;i--)
+		    clipit16(snd[i],sndptr2+i);
+	    }
+	}
+
+	sndptr = sndptr+(numspeakers*endsamples);
+	sndptr2 = sndptr2+(numspeakers*endsamples);
+	rend = ((rend+endsamples)&(FIFOSIZ*2-1));
+    }
+}