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rockbox/apps/plugins/mikmod/load_stx.c
Frank Gevaerts 26f2bfde03 Add MikMod plugin, ported by Jason Yu, with some minor work by Craig Mann and William Peters (FS#8806) 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28810 a1c6a512-1295-4272-9138-f99709370657
2010-12-12 15:03:30 +00:00

439 lines
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/* MikMod sound library
(c) 1998, 1999, 2000, 2001, 2002 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: load_stx.c,v 1.3 2005/04/07 19:57:38 realtech Exp $
STMIK 0.2 (STX) module loader
==============================================================================*/
/*
Written by Claudio Matsuoka <claudio@helllabs.org>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <string.h>
#include "mikmod_internals.h"
#ifdef SUNOS
extern int fprintf(FILE *, const char *, ...);
#endif
/*========== Module structure */
/* header */
typedef struct STXHEADER {
CHAR songname[20];
CHAR trackername[8];
UWORD patsize;
UWORD unknown1;
UWORD patptr;
UWORD insptr;
UWORD chnptr; /* not sure */
UWORD unknown2;
UWORD unknown3;
UBYTE mastermult;
UBYTE initspeed;
UWORD unknown4;
UWORD unknown5;
UWORD patnum;
UWORD insnum;
UWORD ordnum;
UWORD unknown6;
UWORD unknown7;
UWORD unknown8;
CHAR scrm[4];
} STXHEADER;
/* sample information */
typedef struct STXSAMPLE {
UBYTE type;
CHAR filename[12];
UBYTE memsegh;
UWORD memsegl;
ULONG length;
ULONG loopbeg;
ULONG loopend;
UBYTE volume;
UBYTE dsk;
UBYTE pack;
UBYTE flags;
ULONG c2spd;
UBYTE unused[12];
CHAR sampname[28];
CHAR scrs[4];
} STXSAMPLE;
typedef struct STXNOTE {
UBYTE note,ins,vol,cmd,inf;
} STXNOTE;
/*========== Loader variables */
static STXNOTE *stxbuf = NULL; /* pointer to a complete STX pattern */
static STXHEADER *mh = NULL;
static UWORD *paraptr = NULL; /* parapointer array (see STX docs) */
/*========== Loader code */
static int STX_Test(void)
{
UBYTE id[8];
int t;
_mm_fseek(modreader,0x3C,SEEK_SET);
if(!_mm_read_UBYTES(id,4,modreader)) return 0;
if(memcmp(id,"SCRM",4)) return 0;
_mm_fseek(modreader,0x14,SEEK_SET);
if(!_mm_read_UBYTES(id,8,modreader)) return 0;
for(t=0;t<STM_NTRACKERS;t++)
if(!memcmp(id,STM_Signatures[t],8)) return 1;
return 0;
}
static int STX_Init(void)
{
if(!(stxbuf=(STXNOTE*)MikMod_malloc(4*64*sizeof(STXNOTE)))) return 0;
if(!(mh=(STXHEADER*)MikMod_malloc(sizeof(STXHEADER)))) return 0;
if(!(poslookup=(UBYTE*)MikMod_malloc(sizeof(UBYTE)*256))) return 0;
memset(poslookup,-1,256);
return 1;
}
static void STX_Cleanup(void)
{
MikMod_free(stxbuf);
MikMod_free(paraptr);
MikMod_free(poslookup);
MikMod_free(mh);
}
static int STX_ReadPattern(void)
{
int row=0,flag,ch;
STXNOTE *n,dummy;
/* clear pattern data */
memset(stxbuf,255,4*64*sizeof(STXNOTE));
while(row<64) {
flag=_mm_read_UBYTE(modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_PATTERN;
return 0;
}
if(flag) {
ch=flag&31;
if((ch>=0)&&(ch<4))
n=&stxbuf[(64U*ch)+row];
else
n=&dummy;
if(flag&32) {
n->note=_mm_read_UBYTE(modreader);
n->ins=_mm_read_UBYTE(modreader);
}
if(flag&64) {
n->vol=_mm_read_UBYTE(modreader);
if(n->vol>64) n->vol=64;
}
if(flag&128) {
n->cmd=_mm_read_UBYTE(modreader);
n->inf=_mm_read_UBYTE(modreader);
}
} else row++;
}
return 1;
}
static UBYTE* STX_ConvertTrack(STXNOTE* tr)
{
int t;
UniReset();
for(t=0;t<64;t++) {
UBYTE note,ins,vol,cmd,inf;
note=tr[t].note;
ins=tr[t].ins;
vol=tr[t].vol;
cmd=tr[t].cmd;
inf=tr[t].inf;
if((ins)&&(ins!=255)) UniInstrument(ins-1);
if((note)&&(note!=255)) {
if(note==254) {
UniPTEffect(0xc,0); /* note cut command */
vol=255;
} else UniNote(24+((note>>4)*OCTAVE)+(note&0xf)); /* normal note */
}
if(vol<255) UniPTEffect(0xc,vol);
if(cmd<255) switch(cmd) {
case 1: /* Axx set speed to xx */
UniPTEffect(0xf,inf>>4);
break;
case 2: /* Bxx position jump */
UniPTEffect(0xb,inf);
break;
case 3: /* Cxx patternbreak to row xx */
UniPTEffect(0xd,(((inf&0xf0)>>4)*10)+(inf&0xf));
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 */
UniPTEffect(0x3,inf);
break;
case 8: /* Hxy vibrato */
UniPTEffect(0x4,inf);
break;
case 9: /* Ixy tremor, ontime x, offtime y */
UniEffect(UNI_S3MEFFECTI,inf);
break;
case 0: /* protracker arpeggio */
if(!inf) break;
/* fall through */
case 0xa: /* Jxy arpeggio */
UniPTEffect(0x0,inf);
break;
case 0xb: /* Kxy Dual command H00 & Dxy */
UniPTEffect(0x4,0);
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 0xc: /* Lxy Dual command G00 & Dxy */
UniPTEffect(0x3,0);
UniEffect(UNI_S3MEFFECTD,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 panning command 8xx */
UniPTEffect(0x8,inf);
of.flags |= UF_PANNING;
break;
}
UniNewline();
}
return UniDup();
}
static int STX_Load(int curious)
{
int t,u,track = 0;
int version = 0;
SAMPLE *q;
/* try to read module header */
_mm_read_string(mh->songname,20,modreader);
_mm_read_string(mh->trackername,8,modreader);
mh->patsize =_mm_read_I_UWORD(modreader);
mh->unknown1 =_mm_read_I_UWORD(modreader);
mh->patptr =_mm_read_I_UWORD(modreader);
mh->insptr =_mm_read_I_UWORD(modreader);
mh->chnptr =_mm_read_I_UWORD(modreader);
mh->unknown2 =_mm_read_I_UWORD(modreader);
mh->unknown3 =_mm_read_I_UWORD(modreader);
mh->mastermult =_mm_read_UBYTE(modreader);
mh->initspeed =_mm_read_UBYTE(modreader)>>4;
mh->unknown4 =_mm_read_I_UWORD(modreader);
mh->unknown5 =_mm_read_I_UWORD(modreader);
mh->patnum =_mm_read_I_UWORD(modreader);
mh->insnum =_mm_read_I_UWORD(modreader);
mh->ordnum =_mm_read_I_UWORD(modreader);
mh->unknown6 =_mm_read_I_UWORD(modreader);
mh->unknown7 =_mm_read_I_UWORD(modreader);
mh->unknown8 =_mm_read_I_UWORD(modreader);
_mm_read_string(mh->scrm,4,modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
/* set module variables */
of.songname = DupStr(mh->songname,20,1);
of.numpat = mh->patnum;
of.reppos = 0;
of.numins = of.numsmp = mh->insnum;
of.initspeed = mh->initspeed;
of.inittempo = 125;
of.numchn = 4;
of.flags |= UF_S3MSLIDES;
of.bpmlimit = 32;
if(!(paraptr=(UWORD*)MikMod_malloc((of.numins+of.numpat)*sizeof(UWORD))))
return 0;
/* read the instrument+pattern parapointers */
_mm_fseek(modreader,mh->insptr<<4,SEEK_SET);
_mm_read_I_UWORDS(paraptr,of.numins,modreader);
_mm_fseek(modreader,mh->patptr<<4,SEEK_SET);
_mm_read_I_UWORDS(paraptr+of.numins,of.numpat,modreader);
/* check module version */
_mm_fseek(modreader,paraptr[of.numins]<<4,SEEK_SET);
version=_mm_read_I_UWORD(modreader);
if(version==mh->patsize) {
version = 0x10;
of.modtype = StrDup("STMIK 0.2 (STM2STX 1.0)");
} else {
version = 0x11;
of.modtype = StrDup("STMIK 0.2 (STM2STX 1.1)");
}
/* read the order data */
_mm_fseek(modreader,(mh->chnptr<<4)+32,SEEK_SET);
if(!AllocPositions(mh->ordnum)) return 0;
for(t=0;t<mh->ordnum;t++) {
of.positions[t]=_mm_read_UBYTE(modreader);
_mm_fseek(modreader,4,SEEK_CUR);
}
of.numpos=0;poslookupcnt=mh->ordnum;
for(t=0;t<mh->ordnum;t++) {
int order=of.positions[t];
if(order==255) order=LAST_PATTERN;
of.positions[of.numpos]=order;
poslookup[t]=of.numpos; /* bug fix for freaky S3Ms */
if(of.positions[t]<254) of.numpos++;
else
/* special end of song pattern */
if((order==LAST_PATTERN)&&(!curious)) break;
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
/* load samples */
if(!AllocSamples()) return 0;
for(q=of.samples,t=0;t<of.numins;t++,q++) {
STXSAMPLE s;
/* seek to instrument position */
_mm_fseek(modreader,((long)paraptr[t])<<4,SEEK_SET);
/* and load sample info */
s.type =_mm_read_UBYTE(modreader);
_mm_read_string(s.filename,12,modreader);
s.memsegh =_mm_read_UBYTE(modreader);
s.memsegl =_mm_read_I_UWORD(modreader);
s.length =_mm_read_I_ULONG(modreader);
s.loopbeg =_mm_read_I_ULONG(modreader);
s.loopend =_mm_read_I_ULONG(modreader);
s.volume =_mm_read_UBYTE(modreader);
s.dsk =_mm_read_UBYTE(modreader);
s.pack =_mm_read_UBYTE(modreader);
s.flags =_mm_read_UBYTE(modreader);
s.c2spd =_mm_read_I_ULONG(modreader);
_mm_read_UBYTES(s.unused,12,modreader);
_mm_read_string(s.sampname,28,modreader);
_mm_read_string(s.scrs,4,modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_SAMPLEINFO;
return 0;
}
q->samplename = DupStr(s.sampname,28,1);
q->speed = (s.c2spd * 8363) / 8448;
q->length = s.length;
q->loopstart = s.loopbeg;
q->loopend = s.loopend;
q->volume = s.volume;
q->seekpos = (((long)s.memsegh)<<16|s.memsegl)<<4;
q->flags |= SF_SIGNED;
if(s.flags&1) q->flags |= SF_LOOP;
if(s.flags&4) q->flags |= SF_16BITS;
}
/* load pattern info */
of.numtrk=of.numpat*of.numchn;
if(!AllocTracks()) return 0;
if(!AllocPatterns()) return 0;
for(t=0;t<of.numpat;t++) {
/* seek to pattern position (+2 skip pattern length) */
_mm_fseek(modreader,(((long)paraptr[of.numins+t])<<4)+
(version==0x10?2:0),SEEK_SET);
if(!STX_ReadPattern()) return 0;
for(u=0;u<of.numchn;u++)
if(!(of.tracks[track++]=STX_ConvertTrack(&stxbuf[u*64]))) return 0;
}
return 1;
}
static CHAR *STX_LoadTitle(void)
{
CHAR s[28];
_mm_fseek(modreader,0,SEEK_SET);
if(!_mm_read_UBYTES(s,20,modreader)) return NULL;
return(DupStr(s,28,1));
}
/*========== Loader information */
MIKMODAPI MLOADER load_stx={
NULL,
"STX",
"STX (Scream Tracker Music Interface Kit)",
STX_Init,
STX_Test,
STX_Load,
STX_Cleanup,
STX_LoadTitle
};
/* ex:set ts=4: */
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