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- /*
-
- Name:
- LOAD_STM.C
-
- Description:
- ScreamTracker 2 (STM) module Loader - Version 1.oOo Release 2
- A Coding Nightmare by Rao and Air Richter of HaRDCoDE
- You can now play all of those wonderful old C.C. Catch STM's!
-
- Portability:
- All systems - all compilers (hopefully)
-
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include "mikmod.h"
-
- typedef struct STMNOTE{
- UBYTE note,insvol,volcmd,cmdinf;
- } STMNOTE;
-
-
- /* Raw STM sampleinfo struct: */
-
- typedef struct STMSAMPLE{
- char filename[12]; /* Can't have long comments - just filename comments :) */
- char unused; /* 0x00 */
- UBYTE instdisk; /* Instrument disk */
- UWORD reserved; /* ISA in memory when in ST 2 */
- UWORD length; /* Sample length */
- UWORD loopbeg; /* Loop start point */
- UWORD loopend; /* Loop end point */
- UBYTE volume; /* Volume */
- UBYTE reserved2; /* More reserved crap */
- UWORD c2spd; /* Good old c2spd */
- UBYTE reserved3[4]; /* Yet more of PSi's reserved crap */
- UWORD isa; /* Internal Segment Address -> */
- /* contrary to the tech specs, this is NOT actually */
- /* written to the stm file. */
- } STMSAMPLE;
-
- /* Raw STM header struct: */
-
- typedef struct STMHEADER{
- char songname[20];
- char trackername[8]; /* !SCREAM! for ST 2.xx */
- char unused; /* 0x1A */
- char filetype; /* 1=song, 2=module (only 2 is supported, of course) :) */
- char ver_major; /* Like 2 */
- char ver_minor; /* "ditto" */
- UBYTE inittempo; /* initspeed= stm inittempo>>4 */
- UBYTE numpat; /* number of patterns */
- UBYTE globalvol; /* <- WoW! a RiGHT TRiANGLE =8*) */
- UBYTE reserved[13]; /* More of PSi's internal crap */
- STMSAMPLE sample[31]; /* STM sample data */
- UBYTE patorder[128]; /* Docs say 64 - actually 128 */
- } STMHEADER;
-
-
- static STMNOTE *stmbuf;
- static STMHEADER *mh;
-
- char STM_Version[]="Screamtracker 2";
-
-
-
- BOOL STM_Test(void)
- {
- char str[9],filetype;
-
- _mm_fseek(modfp,21,SEEK_SET);
- fread(str,1,9,modfp);
- fread(&filetype,1,1,modfp);
- if(!memcmp(str,"!SCREAM!",8) || (filetype!=2)) /* STM Module = filetype 2 */
- return 0;
- return 1;
- }
-
-
-
- BOOL STM_Init(void)
- {
- stmbuf=NULL;
- if(!(mh=(STMHEADER *)MyCalloc(1,sizeof(STMHEADER)))) return 0;
- return 1;
- }
-
- void STM_Cleanup(void)
- {
- if(mh!=NULL) free(mh);
- if(stmbuf!=NULL) free(stmbuf);
- }
-
-
-
- void STM_ConvertNote(STMNOTE *n)
- {
- UBYTE note,ins,vol,cmd,inf;
-
- /* extract the various information from the 4 bytes that
- make up a single note */
-
- note=n->note;
- ins=n->insvol>>3;
- vol=(n->insvol&7)+(n->volcmd>>1);
- cmd=n->volcmd&15;
- inf=n->cmdinf;
-
- if(ins!=0 && ins<32){
- UniInstrument(ins-1);
- }
-
- /* special values of [SBYTE0] are handled here -> */
- /* we have no idea if these strange values will ever be encountered */
- /* but it appears as though stms sound correct. */
- if(note==254 || note==252) UniPTEffect(0xc,0); /* <- note off command (???) */
- else
- /* if note < 251, then all three bytes are stored in the file */
- if(note<251) UniNote((((note>>4)+2)*12)+(note&0xf)); /* <- normal note and up the octave by two */
-
- if(vol<65){
- UniPTEffect(0xc,vol);
- }
-
- if(cmd!=255){
- switch(cmd){
-
- case 1: /* Axx set speed to xx and add 0x1c to fix StoOoPiD STM 2.x */
- UniPTEffect(0xf,inf>>4);
- break;
-
- case 2: /* Bxx position jump */
- UniPTEffect(0xb,inf);
- break;
-
- case 3: /* Cxx patternbreak to row xx */
- UniPTEffect(0xd,inf);
- break;
-
- case 4: /* Dxy volumeslide */
- UniWrite(UNI_S3MEFFECTD);
- UniWrite(inf);
- break;
-
- case 5: /* Exy toneslide down */
- UniWrite(UNI_S3MEFFECTE);
- UniWrite(inf);
- break;
-
- case 6: /* Fxy toneslide up */
- UniWrite(UNI_S3MEFFECTF);
- UniWrite(inf);
- break;
-
- case 7: /* Gxx Tone portamento,speed xx */
- UniPTEffect(0x3,inf);
- break;
-
- case 8: /* Hxy vibrato */
- UniPTEffect(0x4,inf);
- break;
-
- case 9: /* Ixy tremor, ontime x, offtime y */
- UniWrite(UNI_S3MEFFECTI);
- UniWrite(inf);
- break;
-
- case 0xa: /* Jxy arpeggio */
- UniPTEffect(0x0,inf);
- break;
-
- case 0xb: /* Kxy Dual command H00 & Dxy */
- UniPTEffect(0x4,0);
- UniWrite(UNI_S3MEFFECTD);
- UniWrite(inf);
- break;
-
- case 0xc: /* Lxy Dual command G00 & Dxy */
- UniPTEffect(0x3,0);
- UniWrite(UNI_S3MEFFECTD);
- UniWrite(inf);
- break;
-
- /* Support all these above, since ST2 can LOAD these values */
- /* but can actually only play up to J - and J is only */
- /* half-way implemented in ST2 */
-
- case 0x18: /* Xxx amiga command 8xx - What the hell, support panning. :) */
- UniPTEffect(0x8,inf);
- break;
- }
- }
-
- }
-
-
- UBYTE *STM_ConvertTrack(STMNOTE *n)
- {
- int t;
-
- UniReset();
- for(t=0;t<64;t++)
- { STM_ConvertNote(n);
- UniNewline();
- n+=of.numchn;
- }
- return UniDup();
- }
-
-
-
-
- BOOL STM_LoadPatterns(void)
- {
- int t,s,tracks=0;
-
- if(!AllocPatterns()) return 0;
- if(!AllocTracks()) return 0;
-
- /* Allocate temporary buffer for loading
- and converting the patterns */
-
- if(!(stmbuf=(STMNOTE *)MyCalloc(64U*of.numchn,sizeof(STMNOTE)))) return 0;
-
- for(t=0;t<of.numpat;t++){
-
- for(s=0;s<(64U*of.numchn);s++){
- stmbuf[s].note=_mm_read_UBYTE(modfp);
- stmbuf[s].insvol=_mm_read_UBYTE(modfp);
- stmbuf[s].volcmd=_mm_read_UBYTE(modfp);
- stmbuf[s].cmdinf=_mm_read_UBYTE(modfp);
- }
-
- if(feof(modfp)){
- myerr=ERROR_LOADING_PATTERN;
- return 0;
- }
-
- for(s=0;s<of.numchn;s++){
- if(!(of.tracks[tracks++]=STM_ConvertTrack(stmbuf+s))) return 0;
- }
- }
-
- return 1;
- }
-
-
-
- BOOL STM_Load(void)
- {
- int t;
- ULONG MikMod_ISA; /* We MUST generate our own ISA - NOT stored in the stm */
- INSTRUMENT *d;
- SAMPLE *q;
-
- /* try to read stm header */
-
- _mm_read_str(mh->songname,20,modfp);
- _mm_read_str(mh->trackername,8,modfp);
- mh->unused =_mm_read_UBYTE(modfp);
- mh->filetype =_mm_read_UBYTE(modfp);
- mh->ver_major =_mm_read_UBYTE(modfp);
- mh->ver_minor =_mm_read_UBYTE(modfp);
- mh->inittempo =_mm_read_UBYTE(modfp);
- mh->numpat =_mm_read_UBYTE(modfp);
- mh->globalvol =_mm_read_UBYTE(modfp);
- _mm_read_UBYTES(mh->reserved,13,modfp);
-
- for(t=0;t<31;t++){
- STMSAMPLE *s=&mh->sample[t]; /* STM sample data */
- _mm_read_str(s->filename,12,modfp);
- s->unused =_mm_read_UBYTE(modfp);
- s->instdisk =_mm_read_UBYTE(modfp);
- s->reserved =_mm_read_I_UWORD(modfp);
- s->length =_mm_read_I_UWORD(modfp);
- s->loopbeg =_mm_read_I_UWORD(modfp);
- s->loopend =_mm_read_I_UWORD(modfp);
- s->volume =_mm_read_UBYTE(modfp);
- s->reserved2=_mm_read_UBYTE(modfp);
- s->c2spd =_mm_read_I_UWORD(modfp);
- _mm_read_UBYTES(s->reserved3,4,modfp);
- s->isa =_mm_read_I_UWORD(modfp);
- }
- _mm_read_UBYTES(mh->patorder,128,modfp);
-
- if(feof(modfp)){
- myerr=ERROR_LOADING_HEADER;
- return 0;
- }
-
- /* set module variables */
-
- of.modtype=strdup(STM_Version);
- of.songname=DupStr(mh->songname,20); /* make a cstr of songname */
-
- of.numpat=mh->numpat;
-
- of.initspeed=6; /* Always this */
-
- /* STM 2.x tempo has always been fucked... The default of 96 */
- /* is actually 124, so we add 1ch to the initial value of 60h */
-
- /* MikMak: No it's not.. STM tempo is UNI speed << 4 */
-
- of.inittempo=125; /* mh->inittempo+0x1c; */
- of.initspeed=mh->inittempo>>4;
- of.numchn=4; /* get number of channels */
-
- t=0;
- while(mh->patorder[t]!=99){ /* 99 terminates the patorder list */
- of.positions[t]=mh->patorder[t];
- t++;
- }
- of.numpos=--t;
- of.numtrk=of.numpat*of.numchn;
-
- /* Finally, init the sampleinfo structures */
-
- of.numins=31; /* always this */
-
- if(!AllocInstruments()) return 0;
- if(!STM_LoadPatterns()) return 0;
-
- d=of.instruments;
-
- MikMod_ISA=ftell(modfp);
- MikMod_ISA=(MikMod_ISA+15)&0xfffffff0;
-
- for(t=0;t<of.numins;t++){
-
- d->numsmp=1;
- if(!AllocSamples(d)) return 0;
- q=d->samples;
-
- /* load sample info */
-
- d->insname=DupStr(mh->sample[t].filename,12);
- q->c2spd=mh->sample[t].c2spd;
- q->volume=mh->sample[t].volume;
- q->length=mh->sample[t].length;
- if (!mh->sample[t].volume || q->length==1 ) q->length = 0; /* if vol = 0 or length = 1, then no sample */
- q->loopstart=mh->sample[t].loopbeg;
- q->loopend=mh->sample[t].loopend;
- q->seekpos=MikMod_ISA;
-
- MikMod_ISA+=q->length;
-
- MikMod_ISA=(MikMod_ISA+15)&0xfffffff0;
-
- /* Once again, contrary to the STM specs, all the sample data is */
- /* actually SIGNED! Sheesh */
-
- q->flags=SF_SIGNED;
-
- if(mh->sample[t].loopend>0 && mh->sample[t].loopend!=0xffff) q->flags|=SF_LOOP;
-
- /* fix replen if repend>length */
-
- if(q->loopend>q->length) q->loopend=q->length;
-
- d++;
- }
-
- return 1;
- }
-
-
- LOADER load_stm={
- NULL,
- "STM",
- "Portable STM Loader - V 1.2 - A Coding Nightmare by Rao and Air Richter of HaRDCoDE",
- STM_Init,
- STM_Test,
- STM_Load,
- STM_Cleanup
- };
-