📄 mlutil.c
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/* MikMod sound library
(c) 1998, 1999, 2000, 2001 Miodrag Vallat and others - see file AUTHORS
for complete list.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program 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 Library General Public License for more details.
You should have received a copy of the GNU Library 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.
*/
/*==============================================================================
$Id: mlutil.c,v 1.1.1.1 2004/01/21 01:36:35 raph Exp $
Utility functions for the module loader
==============================================================================*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <string.h>
#include "mikmod_internals.h"
#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif
/*========== Shared tracker identifiers */
CHAR *STM_Signatures[STM_NTRACKERS] = {
"!Scream!",
"BMOD2STM",
"WUZAMOD!"
};
CHAR *STM_Version[STM_NTRACKERS] = {
"Screamtracker 2",
"Converted by MOD2STM (STM format)",
"Wuzamod (STM format)"
};
/*========== Shared loader variables */
SBYTE remap[UF_MAXCHAN]; /* for removing empty channels */
UBYTE* poslookup=NULL; /* lookup table for pattern jumps after blank
pattern removal */
UBYTE poslookupcnt;
UWORD* origpositions=NULL;
BOOL filters; /* resonant filters in use */
UBYTE activemacro; /* active midi macro number for Sxx,xx<80h */
UBYTE filtermacros[UF_MAXMACRO]; /* midi macro settings */
FILTER filtersettings[UF_MAXFILTER]; /* computed filter settings */
/*========== Linear periods stuff */
int* noteindex=NULL; /* remap value for linear period modules */
static int noteindexcount=0;
int *AllocLinear(void)
{
if(of.numsmp>noteindexcount) {
noteindexcount=of.numsmp;
noteindex=realloc(noteindex,noteindexcount*sizeof(int));
}
return noteindex;
}
void FreeLinear(void)
{
if(noteindex) {
free(noteindex);
noteindex=NULL;
}
noteindexcount=0;
}
int speed_to_finetune(ULONG speed,int sample)
{
int ctmp=0,tmp,note=1,finetune=0;
speed>>=1;
while((tmp=getfrequency(of.flags,getlinearperiod(note<<1,0)))<speed) {
ctmp=tmp;
note++;
}
if(tmp!=speed) {
if((tmp-speed)<(speed-ctmp))
while(tmp>speed)
tmp=getfrequency(of.flags,getlinearperiod(note<<1,--finetune));
else {
note--;
while(ctmp<speed)
ctmp=getfrequency(of.flags,getlinearperiod(note<<1,++finetune));
}
}
noteindex[sample]=note-4*OCTAVE;
return finetune;
}
/*========== Order stuff */
/* handles S3M and IT orders */
void S3MIT_CreateOrders(BOOL curious)
{
int t;
of.numpos = 0;
memset(of.positions,0,poslookupcnt*sizeof(UWORD));
memset(poslookup,-1,256);
for(t=0;t<poslookupcnt;t++) {
int order=origpositions[t];
if(order==255) order=LAST_PATTERN;
of.positions[of.numpos]=order;
poslookup[t]=of.numpos; /* bug fix for freaky S3Ms / ITs */
if(origpositions[t]<254) of.numpos++;
else
/* end of song special order */
if((order==LAST_PATTERN)&&(!(curious--))) break;
}
}
/*========== Effect stuff */
/* handles S3M and IT effects */
void S3MIT_ProcessCmd(UBYTE cmd,UBYTE inf,unsigned int flags)
{
UBYTE hi,lo;
lo=inf&0xf;
hi=inf>>4;
/* process S3M / IT specific command structure */
if(cmd!=255) {
switch(cmd) {
case 1: /* Axx set speed to xx */
UniEffect(UNI_S3MEFFECTA,inf);
break;
case 2: /* Bxx position jump */
if (inf<poslookupcnt) {
/* switch to curious mode if necessary, for example
sympex.it, deep joy.it */
if(((SBYTE)poslookup[inf]<0)&&(origpositions[inf]!=255))
S3MIT_CreateOrders(1);
if(!((SBYTE)poslookup[inf]<0))
UniPTEffect(0xb,poslookup[inf]);
}
break;
case 3: /* Cxx patternbreak to row xx */
if ((flags & S3MIT_OLDSTYLE) && !(flags & S3MIT_IT))
UniPTEffect(0xd,(inf>>4)*10+(inf&0xf));
else
UniPTEffect(0xd,inf);
break;
case 4: /* Dxy volumeslide */
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 5: /* Exy toneslide down */
UniEffect(UNI_S3MEFFECTE,inf);
break;
case 6: /* Fxy toneslide up */
UniEffect(UNI_S3MEFFECTF,inf);
break;
case 7: /* Gxx Tone portamento, speed xx */
if (flags & S3MIT_OLDSTYLE)
UniPTEffect(0x3,inf);
else
UniEffect(UNI_ITEFFECTG,inf);
break;
case 8: /* Hxy vibrato */
if (flags & S3MIT_OLDSTYLE)
UniPTEffect(0x4,inf);
else
UniEffect(UNI_ITEFFECTH,inf);
break;
case 9: /* Ixy tremor, ontime x, offtime y */
if (flags & S3MIT_OLDSTYLE)
UniEffect(UNI_S3MEFFECTI,inf);
else
UniEffect(UNI_ITEFFECTI,inf);
break;
case 0xa: /* Jxy arpeggio */
UniPTEffect(0x0,inf);
break;
case 0xb: /* Kxy Dual command H00 & Dxy */
if (flags & S3MIT_OLDSTYLE)
UniPTEffect(0x4,0);
else
UniEffect(UNI_ITEFFECTH,0);
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 0xc: /* Lxy Dual command G00 & Dxy */
if (flags & S3MIT_OLDSTYLE)
UniPTEffect(0x3,0);
else
UniEffect(UNI_ITEFFECTG,0);
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 0xd: /* Mxx Set Channel Volume */
UniEffect(UNI_ITEFFECTM,inf);
break;
case 0xe: /* Nxy Slide Channel Volume */
UniEffect(UNI_ITEFFECTN,inf);
break;
case 0xf: /* Oxx set sampleoffset xx00h */
UniPTEffect(0x9,inf);
break;
case 0x10: /* Pxy Slide Panning Commands */
UniEffect(UNI_ITEFFECTP,inf);
break;
case 0x11: /* Qxy Retrig (+volumeslide) */
UniWriteByte(UNI_S3MEFFECTQ);
if(inf && !lo && !(flags & S3MIT_OLDSTYLE))
UniWriteByte(1);
else
UniWriteByte(inf);
break;
case 0x12: /* Rxy tremolo speed x, depth y */
UniEffect(UNI_S3MEFFECTR,inf);
break;
case 0x13: /* Sxx special commands */
if (inf>=0xf0) {
/* change resonant filter settings if necessary */
if((filters)&&((inf&0xf)!=activemacro)) {
activemacro=inf&0xf;
for(inf=0;inf<0x80;inf++)
filtersettings[inf].filter=filtermacros[activemacro];
}
} else {
/* Scream Tracker does not have samples larger than
64 Kb, thus doesn't need the SAx effect */
if ((flags & S3MIT_SCREAM) && ((inf & 0xf0) == 0xa0))
break;
UniEffect(UNI_ITEFFECTS0,inf);
}
break;
case 0x14: /* Txx tempo */
if(inf>=0x20)
UniEffect(UNI_S3MEFFECTT,inf);
else {
if(!(flags & S3MIT_OLDSTYLE))
/* IT Tempo slide */
UniEffect(UNI_ITEFFECTT,inf);
}
break;
case 0x15: /* Uxy Fine Vibrato speed x, depth y */
if(flags & S3MIT_OLDSTYLE)
UniEffect(UNI_S3MEFFECTU,inf);
else
UniEffect(UNI_ITEFFECTU,inf);
break;
case 0x16: /* Vxx Set Global Volume */
UniEffect(UNI_XMEFFECTG,inf);
break;
case 0x17: /* Wxy Global Volume Slide */
UniEffect(UNI_ITEFFECTW,inf);
break;
case 0x18: /* Xxx amiga command 8xx */
if(flags & S3MIT_OLDSTYLE) {
if(inf>128)
UniEffect(UNI_ITEFFECTS0,0x91); /* surround */
else
UniPTEffect(0x8,(inf==128)?255:(inf<<1));
} else
UniPTEffect(0x8,inf);
break;
case 0x19: /* Yxy Panbrello speed x, depth y */
UniEffect(UNI_ITEFFECTY,inf);
break;
case 0x1a: /* Zxx midi/resonant filters */
if(filtersettings[inf].filter) {
UniWriteByte(UNI_ITEFFECTZ);
UniWriteByte(filtersettings[inf].filter);
UniWriteByte(filtersettings[inf].inf);
}
break;
}
}
}
/*========== Unitrk stuff */
/* Generic effect writing routine */
void UniEffect(UWORD eff,UWORD dat)
{
if((!eff)||(eff>=UNI_LAST)) return;
UniWriteByte(eff);
if(unioperands[eff]==2)
UniWriteWord(dat);
else
UniWriteByte(dat);
}
/* Appends UNI_PTEFFECTX opcode to the unitrk stream. */
void UniPTEffect(UBYTE eff, UBYTE dat)
{
#ifdef MIKMOD_DEBUG
if (eff>=0x10)
fprintf(stderr,"UniPTEffect called with incorrect eff value %d\n",eff);
else
#endif
if((eff)||(dat)||(of.flags&UF_ARPMEM)) UniEffect(UNI_PTEFFECT0+eff,dat);
}
/* Appends UNI_VOLEFFECT + effect/dat to unistream. */
void UniVolEffect(UWORD eff,UBYTE dat)
{
if((eff)||(dat)) { /* don't write empty effect */
UniWriteByte(UNI_VOLEFFECTS);
UniWriteByte(eff);UniWriteByte(dat);
}
}
/* ex:set ts=4: */
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