📄 load_it.c
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/* 2.16 : IT 2.14p3 with resonant filters */
/* 2.15 : IT 2.14p3 (improved compression) */
if((mh->cwt<=0x219)&&(mh->cwt>=0x217))
of.modtype=strdup(IT_Version[mh->cmwt<0x214?4:5]);
else if (mh->cwt>=0x215)
of.modtype=strdup(IT_Version[mh->cmwt<0x214?2:3]);
else {
of.modtype = strdup(IT_Version[mh->cmwt<0x214?0:1]);
of.modtype[mh->cmwt<0x214?15:26] = (mh->cwt>>8)+'0';
of.modtype[mh->cmwt<0x214?17:28] = ((mh->cwt>>4)&0xf)+'0';
of.modtype[mh->cmwt<0x214?18:29] = ((mh->cwt)&0xf)+'0';
}
if(mh->flags&8)
of.flags |= UF_XMPERIODS | UF_LINEAR;
if((mh->cwt>=0x106)&&(mh->flags&16))
old_effect=S3MIT_OLDSTYLE;
else
old_effect=0;
/* set panning positions */
if (mh->flags & 1)
for(t=0;t<64;t++) {
mh->pantable[t]&=0x7f;
if(mh->pantable[t]<64)
of.panning[t]=mh->pantable[t]<<2;
else if(mh->pantable[t]==64)
of.panning[t]=255;
else if(mh->pantable[t]==100)
of.panning[t]=PAN_SURROUND;
else if(mh->pantable[t]==127)
of.panning[t]=PAN_CENTER;
else {
_mm_errno=MMERR_LOADING_HEADER;
return 0;
}
}
else
for(t=0;t<64;t++)
of.panning[t]=PAN_CENTER;
/* set channel volumes */
memcpy(of.chanvol,mh->voltable,64);
/* read the order data */
if(!AllocPositions(mh->ordnum)) return 0;
if(!(origpositions=_mm_calloc(mh->ordnum,sizeof(UWORD)))) return 0;
for(t=0;t<mh->ordnum;t++) {
origpositions[t]=_mm_read_UBYTE(modreader);
if((origpositions[t]>mh->patnum)&&(origpositions[t]<254))
origpositions[t]=255;
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
poslookupcnt=mh->ordnum;
S3MIT_CreateOrders(curious);
if(!(paraptr=(ULONG*)_mm_malloc((mh->insnum+mh->smpnum+of.numpat)*
sizeof(ULONG)))) return 0;
/* read the instrument, sample, and pattern parapointers */
_mm_read_I_ULONGS(paraptr,mh->insnum+mh->smpnum+of.numpat,modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
/* Check for and load midi information for resonant filters */
if(mh->cmwt>=0x216) {
if(mh->special&8) {
IT_LoadMidiConfiguration(modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
} else
IT_LoadMidiConfiguration(NULL);
filters=1;
}
/* Check for and load song comment */
if((mh->special&1)&&(mh->cwt>=0x104)&&(mh->msglength)) {
_mm_fseek(modreader,(long)(mh->msgoffset),SEEK_SET);
if(!ReadComment(mh->msglength)) return 0;
}
if(!(mh->flags&4)) of.numins=of.numsmp;
if(!AllocSamples()) return 0;
if(!AllocLinear()) return 0;
/* Load all samples */
q = of.samples;
for(t=0;t<mh->smpnum;t++) {
ITSAMPLE s;
/* seek to sample position */
_mm_fseek(modreader,(long)(paraptr[mh->insnum+t]+4),SEEK_SET);
/* load sample info */
_mm_read_string(s.filename,12,modreader);
s.zerobyte = _mm_read_UBYTE(modreader);
s.globvol = _mm_read_UBYTE(modreader);
s.flag = _mm_read_UBYTE(modreader);
s.volume = _mm_read_UBYTE(modreader);
_mm_read_string(s.sampname,26,modreader);
s.convert = _mm_read_UBYTE(modreader);
s.panning = _mm_read_UBYTE(modreader);
s.length = _mm_read_I_ULONG(modreader);
s.loopbeg = _mm_read_I_ULONG(modreader);
s.loopend = _mm_read_I_ULONG(modreader);
s.c5spd = _mm_read_I_ULONG(modreader);
s.susbegin = _mm_read_I_ULONG(modreader);
s.susend = _mm_read_I_ULONG(modreader);
s.sampoffset = _mm_read_I_ULONG(modreader);
s.vibspeed = _mm_read_UBYTE(modreader);
s.vibdepth = _mm_read_UBYTE(modreader);
s.vibrate = _mm_read_UBYTE(modreader);
s.vibwave = _mm_read_UBYTE(modreader);
/* Generate an error if c5spd is > 512k, or samplelength > 256 megs
(nothing would EVER be that high) */
if(_mm_eof(modreader)||(s.c5spd>0x7ffffL)||(s.length>0xfffffffUL)) {
_mm_errno = MMERR_LOADING_SAMPLEINFO;
return 0;
}
/* Reality check for sample loop information */
if((s.flag&16)&&
((s.loopbeg>0xfffffffUL)||(s.loopend>0xfffffffUL))) {
_mm_errno = MMERR_LOADING_SAMPLEINFO;
return 0;
}
q->samplename = DupStr(s.sampname,26,0);
q->speed = s.c5spd / 2;
q->panning = ((s.panning&127)==64)?255:(s.panning&127)<<2;
q->length = s.length;
q->loopstart = s.loopbeg;
q->loopend = s.loopend;
q->volume = s.volume;
q->globvol = s.globvol;
q->seekpos = s.sampoffset;
/* Convert speed to XM linear finetune */
if(of.flags&UF_LINEAR)
q->speed=speed_to_finetune(s.c5spd,t);
if(s.panning&128) q->flags|=SF_OWNPAN;
if(s.vibrate) {
q->vibflags |= AV_IT;
q->vibtype = s.vibwave;
q->vibsweep = s.vibrate * 2;
q->vibdepth = s.vibdepth;
q->vibrate = s.vibspeed;
}
if(s.flag&2) q->flags|=SF_16BITS;
if((s.flag&8)&&(mh->cwt>=0x214)) {
q->flags|=SF_ITPACKED;
compressed=1;
}
if(s.flag&16) q->flags|=SF_LOOP;
if(s.flag&64) q->flags|=SF_BIDI;
if(mh->cwt>=0x200) {
if(s.convert&1) q->flags|=SF_SIGNED;
if(s.convert&4) q->flags|=SF_DELTA;
}
q++;
}
/* Load instruments if instrument mode flag enabled */
if(mh->flags&4) {
if(!AllocInstruments()) return 0;
d=of.instruments;
of.flags|=UF_NNA|UF_INST;
for(t=0;t<mh->insnum;t++) {
ITINSTHEADER ih;
/* seek to instrument position */
_mm_fseek(modreader,paraptr[t]+4,SEEK_SET);
/* load instrument info */
_mm_read_string(ih.filename,12,modreader);
ih.zerobyte = _mm_read_UBYTE(modreader);
if(mh->cwt<0x200) {
/* load IT 1.xx inst header */
ih.volflg = _mm_read_UBYTE(modreader);
ih.volbeg = _mm_read_UBYTE(modreader);
ih.volend = _mm_read_UBYTE(modreader);
ih.volsusbeg = _mm_read_UBYTE(modreader);
ih.volsusend = _mm_read_UBYTE(modreader);
_mm_read_I_UWORD(modreader);
ih.fadeout = _mm_read_I_UWORD(modreader);
ih.nna = _mm_read_UBYTE(modreader);
ih.dnc = _mm_read_UBYTE(modreader);
} else {
/* Read IT200+ header */
ih.nna = _mm_read_UBYTE(modreader);
ih.dct = _mm_read_UBYTE(modreader);
ih.dca = _mm_read_UBYTE(modreader);
ih.fadeout = _mm_read_I_UWORD(modreader);
ih.ppsep = _mm_read_UBYTE(modreader);
ih.ppcenter = _mm_read_UBYTE(modreader);
ih.globvol = _mm_read_UBYTE(modreader);
ih.chanpan = _mm_read_UBYTE(modreader);
ih.rvolvar = _mm_read_UBYTE(modreader);
ih.rpanvar = _mm_read_UBYTE(modreader);
}
ih.trkvers = _mm_read_I_UWORD(modreader);
ih.numsmp = _mm_read_UBYTE(modreader);
_mm_read_UBYTE(modreader);
_mm_read_string(ih.name,26,modreader);
_mm_read_UBYTES(ih.blank01,6,modreader);
_mm_read_I_UWORDS(ih.samptable,ITNOTECNT,modreader);
if(mh->cwt<0x200) {
/* load IT 1xx volume envelope */
_mm_read_UBYTES(ih.volenv,200,modreader);
for(lp=0;lp<ITENVCNT;lp++) {
ih.oldvoltick[lp] = _mm_read_UBYTE(modreader);
ih.volnode[lp] = _mm_read_UBYTE(modreader);
}
} else {
/* load IT 2xx volume, pan and pitch envelopes */
#if defined __STDC__ || defined _MSC_VER || defined MPW_C
#define IT_LoadEnvelope(name,type) \
ih. name##flg =_mm_read_UBYTE(modreader); \
ih. name##pts =_mm_read_UBYTE(modreader); \
ih. name##beg =_mm_read_UBYTE(modreader); \
ih. name##end =_mm_read_UBYTE(modreader); \
ih. name##susbeg=_mm_read_UBYTE(modreader); \
ih. name##susend=_mm_read_UBYTE(modreader); \
for(lp=0;lp<ITENVCNT;lp++) { \
ih. name##node[lp]=_mm_read_##type (modreader); \
ih. name##tick[lp]=_mm_read_I_UWORD(modreader); \
} \
_mm_read_UBYTE(modreader)
#else
#define IT_LoadEnvelope(name,type) \
ih. name/**/flg =_mm_read_UBYTE(modreader); \
ih. name/**/pts =_mm_read_UBYTE(modreader); \
ih. name/**/beg =_mm_read_UBYTE(modreader); \
ih. name/**/end =_mm_read_UBYTE(modreader); \
ih. name/**/susbeg=_mm_read_UBYTE(modreader); \
ih. name/**/susend=_mm_read_UBYTE(modreader); \
for(lp=0;lp<ITENVCNT;lp++) { \
ih. name/**/node[lp]=_mm_read_/**/type (modreader); \
ih. name/**/tick[lp]=_mm_read_I_UWORD(modreader); \
} \
_mm_read_UBYTE(modreader)
#endif
IT_LoadEnvelope(vol,UBYTE);
IT_LoadEnvelope(pan,SBYTE);
IT_LoadEnvelope(pit,SBYTE);
#undef IT_LoadEnvelope
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_SAMPLEINFO;
return 0;
}
d->volflg|=EF_VOLENV;
d->insname = DupStr(ih.name,26,0);
d->nnatype = ih.nna & NNA_MASK;
if(mh->cwt<0x200) {
d->volfade=ih.fadeout<< 6;
if(ih.dnc) {
d->dct=DCT_NOTE;
d->dca=DCA_CUT;
}
if(ih.volflg&1) d->volflg|=EF_ON;
if(ih.volflg&2) d->volflg|=EF_LOOP;
if(ih.volflg&4) d->volflg|=EF_SUSTAIN;
/* XM conversion of IT envelope Array */
d->volbeg = ih.volbeg;
d->volend = ih.volend;
d->volsusbeg = ih.volsusbeg;
d->volsusend = ih.volsusend;
if(ih.volflg&1) {
for(u=0;u<ITENVCNT;u++)
if(ih.oldvoltick[d->volpts]!=0xff) {
d->volenv[d->volpts].val=(ih.volnode[d->volpts]<<2);
d->volenv[d->volpts].pos=ih.oldvoltick[d->volpts];
d->volpts++;
} else
break;
}
} else {
d->panning=((ih.chanpan&127)==64)?255:(ih.chanpan&127)<<2;
if(!(ih.chanpan&128)) d->flags|=IF_OWNPAN;
if(!(ih.ppsep & 128)) {
d->pitpansep=ih.ppsep<<2;
d->pitpancenter=ih.ppcenter;
d->flags|=IF_PITCHPAN;
}
d->globvol=ih.globvol>>1;
d->volfade=ih.fadeout<<5;
d->dct =ih.dct;
d->dca =ih.dca;
if(mh->cwt>=0x204) {
d->rvolvar = ih.rvolvar;
d->rpanvar = ih.rpanvar;
}
#if defined __STDC__ || defined _MSC_VER || defined MPW_C
#define IT_ProcessEnvelope(name) \
if(ih. name##flg&1) d-> name##flg|=EF_ON; \
if(ih. name##flg&2) d-> name##flg|=EF_LOOP; \
if(ih. name##flg&4) d-> name##flg|=EF_SUSTAIN; \
d-> name##pts=ih. name##pts; \
d-> name##beg=ih. name##beg; \
d-> name##end=ih. name##end; \
d-> name##susbeg=ih. name##susbeg; \
d-> name##susend=ih. name##susend; \
\
for(u=0;u<ih. name##pts;u++) \
d-> name##env[u].pos=ih. name##tick[u]; \
\
if((d-> name##flg&EF_ON)&&(d-> name##pts<2)) \
d-> name##flg&=~EF_ON
#else
#define IT_ProcessEnvelope(name) \
if(ih. name/**/flg&1) d-> name/**/flg|=EF_ON; \
if(ih. name/**/flg&2) d-> name/**/flg|=EF_LOOP; \
if(ih. name/**/flg&4) d-> name/**/flg|=EF_SUSTAIN; \
d-> name/**/pts=ih. name/**/pts; \
d-> name/**/beg=ih. name/**/beg; \
d-> name/**/end=ih. name/**/end; \
d-> name/**/susbeg=ih. name/**/susbeg; \
d-> name/**/susend=ih. name/**/susend; \
\
for(u=0;u<ih. name/**/pts;u++) \
d-> name/**/env[u].pos=ih. name/**/tick[u]; \
\
if((d-> name/**/flg&EF_ON)&&(d-> name/**/pts<2)) \
d-> name/**/flg&=~EF_ON
#endif
IT_ProcessEnvelope(vol);
for(u=0;u<ih.volpts;u++)
d->volenv[u].val=(ih.volnode[u]<<2);
IT_ProcessEnvelope(pan);
for(u=0;u<ih.panpts;u++)
d->panenv[u].val=
ih.pannode[u]==32?255:(ih.pannode[u]+32)<<2;
IT_ProcessEnvelope(pit);
for(u=0;u<ih.pitpts;u++)
d->pitenv[u].val=ih.pitnode[u]+32;
#undef IT_ProcessEnvelope
if(ih.pitflg&0x80) {
/* filter envelopes not supported yet */
d->pitflg&=~EF_ON;
ih.pitpts=ih.pitbeg=ih.pitend=0;
#ifdef MIKMOD_DEBUG
{
static int warn=0;
if(!warn)
fprintf(stderr, "\rFilter envelopes not supported yet\n");
warn=1;
}
#endif
}
}
for(u=0;u<ITNOTECNT;u++) {
d->samplenote[u]=(ih.samptable[u]&255);
d->samplenumber[u]=
(ih.samptable[u]>>8)?((ih.samptable[u]>>8)-1):0xffff;
if(d->samplenumber[u]>=of.numsmp)
d->samplenote[u]=255;
else if (of.flags&UF_LINEAR) {
int note=(int)d->samplenote[u]+noteindex[d->samplenumber[u]];
d->samplenote[u]=(note<0)?0:(note>255?255:note);
}
}
d++;
}
} else if(of.flags & UF_LINEAR) {
if(!AllocInstruments()) return 0;
d=of.instruments;
of.flags|=UF_INST;
for(t=0;t<mh->smpnum;t++,d++)
for(u=0;u<ITNOTECNT;u++) {
if(d->samplenumber[u]>=of.numsmp)
d->samplenote[u]=255;
else {
int note=(int)d->samplenote[u]+noteindex[d->samplenumber[u]];
d->samplenote[u]=(note<0)?0:(note>255?255:note);
}
}
}
/* Figure out how many channels this song actually uses */
of.numchn=0;
memset(remap,-1,UF_MAXCHAN*sizeof(UBYTE));
for(t=0;t<of.numpat;t++) {
UWORD packlen;
/* seek to pattern position */
if(paraptr[mh->insnum+mh->smpnum+t]) { /* 0 -> empty 64 row pattern */
_mm_fseek(modreader,((long)paraptr[mh->insnum+mh->smpnum+t]),SEEK_SET);
_mm_read_I_UWORD(modreader);
/* read pattern length (# of rows)
Impulse Tracker never creates patterns with less than 32 rows,
but some other trackers do, so we only check for more than 256
rows */
packlen=_mm_read_I_UWORD(modreader);
if(packlen>256) {
_mm_errno=MMERR_LOADING_PATTERN;
return 0;
}
_mm_read_I_ULONG(modreader);
if(IT_GetNumChannels(packlen)) return 0;
}
}
/* give each of them a different number */
for(t=0;t<UF_MAXCHAN;t++)
if(!remap[t])
remap[t]=of.numchn++;
of.numtrk = of.numpat*of.numchn;
if(of.numvoices)
if (of.numvoices<of.numchn) of.numvoices=of.numchn;
if(!AllocPatterns()) return 0;
if(!AllocTracks()) return 0;
for(t=0;t<of.numpat;t++) {
UWORD packlen;
/* seek to pattern position */
if(!paraptr[mh->insnum+mh->smpnum+t]) { /* 0 -> empty 64 row pattern */
of.pattrows[t]=64;
for(u=0;u<of.numchn;u++) {
int k;
UniReset();
for(k=0;k<64;k++) UniNewline();
of.tracks[numtrk++]=UniDup();
}
} else {
_mm_fseek(modreader,((long)paraptr[mh->insnum+mh->smpnum+t]),SEEK_SET);
packlen=_mm_read_I_UWORD(modreader);
of.pattrows[t]=_mm_read_I_UWORD(modreader);
_mm_read_I_ULONG(modreader);
if(!IT_ReadPattern(of.pattrows[t])) return 0;
}
}
return 1;
}
CHAR *IT_LoadTitle(void)
{
CHAR s[26];
_mm_fseek(modreader,4,SEEK_SET);
if(!_mm_read_UBYTES(s,26,modreader)) return NULL;
return(DupStr(s,26,0));
}
/*========== Loader information */
MIKMODAPI MLOADER load_it={
NULL,
"IT",
"IT (Impulse Tracker)",
IT_Init,
IT_Test,
IT_Load,
IT_Cleanup,
IT_LoadTitle
};
/* ex:set ts=4: */
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