📄 load_gdm.c
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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_gdm.c,v 1.1.1.1 2004/01/21 01:36:35 raph Exp $
General DigiMusic (GDM) module loader
==============================================================================*/
/*
Written by Kev Vance<kvance@zeux.org>
based on the file format description written by 'MenTaLguY'
<mental@kludge.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
typedef struct GDMNOTE {
UBYTE note;
UBYTE samp;
struct {
UBYTE effect;
UBYTE param;
} effect[4];
} GDMNOTE;
typedef GDMNOTE GDMTRACK[64];
typedef struct GDMHEADER {
CHAR id1[4];
CHAR songname[32];
CHAR author[32];
CHAR eofmarker[3];
CHAR id2[4];
UBYTE majorver;
UBYTE minorver;
UWORD trackerid;
UBYTE t_majorver;
UBYTE t_minorver;
UBYTE pantable[32];
UBYTE mastervol;
UBYTE mastertempo;
UBYTE masterbpm;
UWORD flags;
ULONG orderloc;
UBYTE ordernum;
ULONG patternloc;
UBYTE patternnum;
ULONG samhead;
ULONG samdata;
UBYTE samnum;
ULONG messageloc;
ULONG messagelen;
ULONG scrollyloc;
UWORD scrollylen;
ULONG graphicloc;
UWORD graphiclen;
} GDMHEADER;
typedef struct GDMSAMPLE {
CHAR sampname[32];
CHAR filename[13];
UBYTE ems;
ULONG length;
ULONG loopbeg;
ULONG loopend;
UBYTE flags;
UWORD c4spd;
UBYTE vol;
UBYTE pan;
} GDMSAMPLE;
static GDMHEADER *mh=NULL; /* pointer to GDM header */
static GDMNOTE *gdmbuf=NULL; /* pointer to a complete GDM pattern */
CHAR GDM_Version[]="General DigiMusic 1.xx";
BOOL GDM_Test(void)
{
/* test for gdm magic numbers */
UBYTE id[4];
_mm_fseek(modreader,0x00,SEEK_SET);
if (!_mm_read_UBYTES(id,4,modreader))
return 0;
if (!memcmp(id,"GDM\xfe",4)) {
_mm_fseek(modreader,71,SEEK_SET);
if (!_mm_read_UBYTES(id,4,modreader))
return 0;
if (!memcmp(id,"GMFS",4))
return 1;
}
return 0;
}
BOOL GDM_Init(void)
{
if (!(gdmbuf=(GDMNOTE*)_mm_malloc(32*64*sizeof(GDMNOTE)))) return 0;
if (!(mh=(GDMHEADER*)_mm_malloc(sizeof(GDMHEADER)))) return 0;
return 1;
}
void GDM_Cleanup(void)
{
_mm_free(mh);
_mm_free(gdmbuf);
}
BOOL GDM_ReadPattern(void)
{
int pos,flag,ch,i,maxch;
GDMNOTE n;
UWORD length,x=0;
/* get pattern length */
length=_mm_read_I_UWORD(modreader)-2;
/* clear pattern data */
memset(gdmbuf,255,32*64*sizeof(GDMNOTE));
pos=0;
maxch=0;
while (x<length) {
memset(&n,255,sizeof(GDMNOTE));
flag=_mm_read_UBYTE(modreader);
x++;
if (_mm_eof(modreader)) {
_mm_errno=MMERR_LOADING_PATTERN;
return 0;
}
ch=flag&31;
if (ch>maxch) maxch=ch;
if (!flag) {
pos++;
continue;
}
if (flag&0x60) {
if (flag&0x20) {
/* new note */
n.note=_mm_read_UBYTE(modreader)&127;
n.samp=_mm_read_UBYTE(modreader);
x +=2;
}
if (flag&0x40) {
do {
/* effect channel set */
i=_mm_read_UBYTE(modreader);
n.effect[i>>6].effect=i&31;
n.effect[i>>6].param=_mm_read_UBYTE(modreader);
x +=2;
} while (i&32);
}
memcpy(gdmbuf+(64U*ch)+pos,&n,sizeof(GDMNOTE));
}
}
return 1;
}
UBYTE *GDM_ConvertTrack(GDMNOTE*tr)
{
int t,i=0;
UBYTE note,ins,inf;
UniReset();
for (t=0;t<64;t++) {
note=tr[t].note;
ins=tr[t].samp;
if ((ins)&&(ins!=255))
UniInstrument(ins-1);
if (note!=255) {
UniNote(((note>>4)*OCTAVE)+(note&0xf)-1);
}
for (i=0;i<4;i++) {
inf = tr[t].effect[i].param;
switch (tr[t].effect[i].effect) {
case 1: /* toneslide up */
UniEffect(UNI_S3MEFFECTF,inf);
break;
case 2: /* toneslide down */
UniEffect(UNI_S3MEFFECTE,inf);
break;
case 3: /* glissando to note */
UniEffect(UNI_ITEFFECTG,inf);
break;
case 4: /* vibrato */
UniEffect(UNI_ITEFFECTH,inf);
break;
case 5: /* portamento+volslide */
UniEffect(UNI_ITEFFECTG,0);
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 6: /* vibrato+volslide */
UniEffect(UNI_ITEFFECTH,0);
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 7: /* tremolo */
UniEffect(UNI_S3MEFFECTR,inf);
break;
case 8: /* tremor */
UniEffect(UNI_S3MEFFECTI,inf);
break;
case 9: /* offset */
UniPTEffect(0x09,inf);
break;
case 0x0a: /* volslide */
UniEffect(UNI_S3MEFFECTD,inf);
break;
case 0x0b: /* jump to order */
UniPTEffect(0x0b,inf);
break;
case 0x0c: /* volume set */
UniPTEffect(0x0c,inf);
break;
case 0x0d: /* pattern break */
UniPTEffect(0x0d,inf);
break;
case 0x0e: /* extended */
switch (inf&0xf0) {
case 0x10: /* fine portamento up */
UniEffect(UNI_S3MEFFECTF, 0x0f|((inf<<4)&0x0f));
break;
case 0x20: /* fine portamento down */
UniEffect(UNI_S3MEFFECTE, 0xf0|(inf&0x0f));
break;
case 0x30: /* glissando control */
UniEffect(SS_GLISSANDO, inf&0x0f);
break;
case 0x40: /* vibrato waveform */
UniEffect(SS_VIBWAVE, inf&0x0f);
break;
case 0x50: /* set c4spd */
UniEffect(SS_FINETUNE, inf&0x0f);
break;
case 0x60: /* loop fun */
UniEffect(UNI_ITEFFECTS0, (inf&0x0f)|0xb0);
break;
case 0x70: /* tremolo waveform */
UniEffect(SS_TREMWAVE, inf&0x0f);
break;
case 0x80: /* extra fine porta up */
UniEffect(UNI_S3MEFFECTF, 0x0e|((inf<<4)&0x0f));
break;
case 0x90: /* extra fine porta down */
UniEffect(UNI_S3MEFFECTE, 0xe0|(inf&0x0f));
break;
case 0xa0: /* fine volslide up */
UniEffect(UNI_S3MEFFECTD, 0x0f|((inf<<4)&0x0f));
break;
case 0xb0: /* fine volslide down */
UniEffect(UNI_S3MEFFECTE, 0xf0|(inf&0x0f));
break;
case 0xc0: /* note cut */
case 0xd0: /* note delay */
case 0xe0: /* extend row */
UniPTEffect(0xe,inf);
break;
}
break;
case 0x0f: /* set tempo */
UniEffect(UNI_S3MEFFECTA,inf);
break;
case 0x10: /* arpeggio */
UniPTEffect(0x0,inf);
break;
case 0x12: /* retrigger */
UniEffect(UNI_S3MEFFECTQ,inf);
break;
case 0x13: /* set global volume */
UniEffect(UNI_XMEFFECTG,inf<<1);
break;
case 0x14: /* fine vibrato */
UniEffect(UNI_ITEFFECTU,inf);
break;
case 0x1e: /* special */
switch (inf&0xf0) {
case 8: /* set pan position */
if (inf >=128)
UniPTEffect(0x08,255);
else
UniPTEffect(0x08,inf<<1);
break;
}
break;
case 0x1f: /* set bpm */
if (inf >=0x20)
UniEffect(UNI_S3MEFFECTT,inf);
break;
}
}
UniNewline();
}
return UniDup();
}
BOOL GDM_Load(BOOL curious)
{
int i,x,u,track;
SAMPLE *q;
GDMSAMPLE s;
ULONG position;
/* read header */
_mm_read_string(mh->id1,4,modreader);
_mm_read_string(mh->songname,32,modreader);
_mm_read_string(mh->author,32,modreader);
_mm_read_string(mh->eofmarker,3,modreader);
_mm_read_string(mh->id2,4,modreader);
mh->majorver=_mm_read_UBYTE(modreader);
mh->minorver=_mm_read_UBYTE(modreader);
mh->trackerid=_mm_read_I_UWORD(modreader);
mh->t_majorver=_mm_read_UBYTE(modreader);
mh->t_minorver=_mm_read_UBYTE(modreader);
_mm_read_UBYTES(mh->pantable,32,modreader);
mh->mastervol=_mm_read_UBYTE(modreader);
mh->mastertempo=_mm_read_UBYTE(modreader);
mh->masterbpm=_mm_read_UBYTE(modreader);
mh->flags=_mm_read_I_UWORD(modreader);
mh->orderloc=_mm_read_I_ULONG(modreader);
mh->ordernum=_mm_read_UBYTE(modreader);
mh->patternloc=_mm_read_I_ULONG(modreader);
mh->patternnum=_mm_read_UBYTE(modreader);
mh->samhead=_mm_read_I_ULONG(modreader);
mh->samdata=_mm_read_I_ULONG(modreader);
mh->samnum=_mm_read_UBYTE(modreader);
mh->messageloc=_mm_read_I_ULONG(modreader);
mh->messagelen=_mm_read_I_ULONG(modreader);
mh->scrollyloc=_mm_read_I_ULONG(modreader);
mh->scrollylen=_mm_read_I_UWORD(modreader);
mh->graphicloc=_mm_read_I_ULONG(modreader);
mh->graphiclen=_mm_read_I_UWORD(modreader);
/* have we ended abruptly? */
if (_mm_eof(modreader)) {
_mm_errno=MMERR_LOADING_HEADER;
return 0;
}
/* any orders? */
if(mh->ordernum==255) {
_mm_errno=MMERR_LOADING_PATTERN;
return 0;
}
/* now we fill */
of.modtype=strdup(GDM_Version);
of.modtype[18]=mh->majorver+'0';
of.modtype[20]=mh->minorver/10+'0';
of.modtype[21]=mh->minorver%10+'0';
of.songname=DupStr(mh->songname,32,0);
of.numpat=mh->patternnum+1;
of.reppos=0;
of.numins=of.numsmp=mh->samnum+1;
of.initspeed=mh->mastertempo;
of.inittempo=mh->masterbpm;
of.initvolume=mh->mastervol<<1;
of.flags|=UF_S3MSLIDES | UF_PANNING;
/* XXX whenever possible, we should try to determine the original format.
Here we assume it was S3M-style wrt bpmlimit... */
of.bpmlimit = 32;
/* read the order data */
if (!AllocPositions(mh->ordernum+1)) {
_mm_errno=MMERR_OUT_OF_MEMORY;
return 0;
}
_mm_fseek(modreader,mh->orderloc,SEEK_SET);
for (i=0;i<mh->ordernum+1;i++)
of.positions[i]=_mm_read_UBYTE(modreader);
of.numpos=0;
for (i=0;i<mh->ordernum+1;i++) {
int order=of.positions[i];
if(order==255) order=LAST_PATTERN;
of.positions[of.numpos]=order;
if (of.positions[i]<254) of.numpos++;
}
/* have we ended abruptly yet? */
if (_mm_eof(modreader)) {
_mm_errno=MMERR_LOADING_HEADER;
return 0;
}
/* time to load the samples */
if (!AllocSamples()) {
_mm_errno=MMERR_OUT_OF_MEMORY;
return 0;
}
q=of.samples;
position=mh->samdata;
/* seek to instrument position */
_mm_fseek(modreader,mh->samhead,SEEK_SET);
for (i=0;i<of.numins;i++) {
/* load sample info */
_mm_read_UBYTES(s.sampname,32,modreader);
_mm_read_UBYTES(s.filename,12,modreader);
s.ems=_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.flags=_mm_read_UBYTE(modreader);
s.c4spd=_mm_read_I_UWORD(modreader);
s.vol=_mm_read_UBYTE(modreader);
s.pan=_mm_read_UBYTE(modreader);
if (_mm_eof(modreader)) {
_mm_errno=MMERR_LOADING_SAMPLEINFO;
return 0;
}
q->samplename=DupStr(s.sampname,32,0);
q->speed=s.c4spd;
q->length=s.length;
q->loopstart=s.loopbeg;
q->loopend=s.loopend;
q->volume=s.vol;
q->panning=s.pan;
q->seekpos=position;
position +=s.length;
if (s.flags&1)
q->flags |=SF_LOOP;
if (s.flags&2)
q->flags |=SF_16BITS;
if (s.flags&16)
q->flags |=SF_STEREO;
q++;
}
/* set the panning */
for (i=x=0;i<32;i++) {
of.panning[i]=mh->pantable[i];
if (!of.panning[i])
of.panning[i]=PAN_LEFT;
else if (of.panning[i]==8)
of.panning[i]=PAN_CENTER;
else if (of.panning[i]==15)
of.panning[i]=PAN_RIGHT;
else if (of.panning[i]==16)
of.panning[i]=PAN_SURROUND;
else if (of.panning[i]==255)
of.panning[i]=128;
else
of.panning[i]<<=3;
if (mh->pantable[i]!=255)
x=i;
}
of.numchn=x+1;
if (of.numchn<1)
of.numchn=1; /* for broken counts */
/* load the pattern info */
of.numtrk=of.numpat*of.numchn;
/* jump to patterns */
_mm_fseek(modreader,mh->patternloc,SEEK_SET);
if (!AllocTracks()) {
_mm_errno=MMERR_OUT_OF_MEMORY;
return 0;
}
if (!AllocPatterns()) {
_mm_errno=MMERR_OUT_OF_MEMORY;
return 0;
}
for (i=track=0;i<of.numpat;i++) {
if (!GDM_ReadPattern()) {
_mm_errno=MMERR_LOADING_PATTERN;
return 0;
}
for (u=0;u<of.numchn;u++,track++) {
of.tracks[track]=GDM_ConvertTrack(&gdmbuf[u<<6]);
if (!of.tracks[track]) {
_mm_errno=MMERR_LOADING_TRACK;
return 0;
}
}
}
return 1;
}
CHAR *GDM_LoadTitle(void)
{
CHAR s[32];
_mm_fseek(modreader,4,SEEK_SET);
if (!_mm_read_UBYTES(s,32,modreader)) return NULL;
return DupStr(s,28,0);
}
MIKMODAPI MLOADER load_gdm=
{
NULL,
"GDM",
"GDM (General DigiMusic)",
GDM_Init,
GDM_Test,
GDM_Load,
GDM_Cleanup,
GDM_LoadTitle
};
/* ex:set ts=4: */
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