rockbox/apps/plugins/mikmod/load_imf.c

/*	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.
*/

/*==============================================================================

  $Id$

  Imago Orpheus (IMF) module loader

==============================================================================*/

#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 */

/* module header */
typedef struct IMFHEADER {
	CHAR  songname[32];
	UWORD ordnum;
	UWORD patnum;
	UWORD insnum;
	UWORD flags;
	UBYTE initspeed;
	UBYTE inittempo;
	UBYTE mastervol;
	UBYTE mastermult;
	UBYTE orders[256];
} IMFHEADER;

/* channel settings */
typedef struct IMFCHANNEL {
	CHAR  name[12];
	UBYTE chorus;
	UBYTE reverb;
	UBYTE pan;
	UBYTE status;
} IMFCHANNEL;

/* instrument header */
#define IMFNOTECNT (10*OCTAVE)
#define IMFENVCNT (16*2)
typedef struct IMFINSTHEADER {
	CHAR  name[32];
	UBYTE what[IMFNOTECNT];
	UWORD volenv[IMFENVCNT];
	UWORD panenv[IMFENVCNT];
	UWORD pitenv[IMFENVCNT];
	UBYTE volpts;
	UBYTE volsus;
	UBYTE volbeg;
	UBYTE volend;
	UBYTE volflg;
	UBYTE panpts;
	UBYTE pansus;
	UBYTE panbeg;
	UBYTE panend;
	UBYTE panflg;
	UBYTE pitpts;
	UBYTE pitsus;
	UBYTE pitbeg;
	UBYTE pitend;
	UBYTE pitflg;
	UWORD volfade;
	UWORD numsmp;
	ULONG signature;
} IMFINSTHEADER;

/* sample header */
typedef struct IMFWAVHEADER {
	CHAR  samplename[13];
	ULONG length;
	ULONG loopstart;
	ULONG loopend;
	ULONG samplerate;
	UBYTE volume;
	UBYTE pan;
	UBYTE flags;
} IMFWAVHEADER;

typedef struct IMFNOTE {
	UBYTE note,ins,eff1,dat1,eff2,dat2;
} IMFNOTE;

/*========== Loader variables */

static	CHAR IMF_Version[]="Imago Orpheus";

static	IMFNOTE *imfpat=NULL;
static	IMFHEADER *mh=NULL;

/*========== Loader code */

static int IMF_Test(void)
{
	UBYTE buf[512], *p;
	int t, chn;

	_mm_fseek(modreader,0x3c,SEEK_SET);
	if (!_mm_read_UBYTES(buf,4,modreader)) return 0;
	if (memcmp(buf,"IM10",4) != 0) return 0;	/* no magic */

	_mm_fseek(modreader,32,SEEK_SET);
	if (_mm_read_I_UWORD(modreader) > 256) return 0;/* bad ordnum */
	if (_mm_read_I_UWORD(modreader) > 256) return 0;/* bad patnum */
	if (_mm_read_I_UWORD(modreader) > 256) return 0;/* bad insnum */

	_mm_fseek(modreader,64,SEEK_SET);
	if(!_mm_read_UBYTES(buf,512,modreader)) return 0;
	/* verify channel status */
	for (t = 0, chn = 0, p = &buf[15]; t < 512; t += 16, p += 16) {
		switch (*p) {
		case  0:		/* channel enabled */
		case  1:		/* channel muted   */
			chn++;
			break;
		case  2:		/* channel disabled */
			break;
		default:		/* bad status value */
			return 0;
		}
	}
	if(!chn) return 0;		/* no channels found */

	return 1;
}

static int IMF_Init(void)
{
	if(!(imfpat=(IMFNOTE*)MikMod_malloc(32*256*sizeof(IMFNOTE)))) return 0;
	if(!(mh=(IMFHEADER*)MikMod_malloc(sizeof(IMFHEADER)))) return 0;

	return 1;
}

static void IMF_Cleanup(void)
{
	FreeLinear();

	MikMod_free(imfpat);
	MikMod_free(mh);
	imfpat=NULL;
	mh=NULL;
}

static int IMF_ReadPattern(SLONG size,UWORD rows)
{
	int row=0,flag,ch;
	IMFNOTE *n,dummy;

	/* clear pattern data */
	memset(imfpat,255,32*256*sizeof(IMFNOTE));

	while((size>0)&&(row<rows)) {
		flag=_mm_read_UBYTE(modreader);size--;

		if(_mm_eof(modreader)) {
			_mm_errno=MMERR_LOADING_PATTERN;
			return 0;
		}

		if(flag) {
			ch=remap[flag&31];

			if(ch!=-1)
				n=&imfpat[256*ch+row];
			else
				n=&dummy;

			if(flag&32) {
				n->note=_mm_read_UBYTE(modreader);
				if(n->note>=0xa0) n->note=0xa0; /* note off */
				n->ins =_mm_read_UBYTE(modreader);
				size-=2;
			}
			if(flag&64) {
				size-=2;
				n->eff2=_mm_read_UBYTE(modreader);
				n->dat2=_mm_read_UBYTE(modreader);
			}
			if(flag&128) {
				n->eff1=_mm_read_UBYTE(modreader);
				n->dat1=_mm_read_UBYTE(modreader);
				size-=2;
			}
		} else row++;
	}
	if((size)||(row!=rows)) {
		_mm_errno=MMERR_LOADING_PATTERN;
		return 0;
	}
	return 1;
}

static void IMF_ProcessCmd(UBYTE eff,UBYTE inf)
{
	if((eff)&&(eff!=255))
		switch (eff) {
			case 0x01:	/* set tempo */
				UniEffect(UNI_S3MEFFECTA,inf);
				break;
			case 0x02:	/* set BPM */
				if(inf>=0x20) UniEffect(UNI_S3MEFFECTT,inf);
				break;
			case 0x03:	/* tone portamento */
				UniEffect(UNI_ITEFFECTG,inf);
				break;
			case 0x04:	/* porta + volslide */
				UniEffect(UNI_ITEFFECTG,inf);
				UniEffect(UNI_S3MEFFECTD,0);
				break;
			case 0x05:	/* vibrato */
				UniEffect(UNI_XMEFFECT4,inf);
				break;
			case 0x06:	/* vibrato + volslide */
				UniEffect(UNI_XMEFFECT6,inf);
				break;
			case 0x07:	/* fine vibrato */
				UniEffect(UNI_ITEFFECTU,inf);
				break;
			case 0x08:	/* tremolo */
				UniEffect(UNI_S3MEFFECTR,inf);
				break;
			case 0x09:	/* arpeggio */
				UniPTEffect(0x0,inf);
				break;
			case 0x0a:	/* panning */
				UniPTEffect(0x8,(inf>=128)?255:(inf<<1));
				break;
			case 0x0b:	/* pan slide */
				UniEffect(UNI_XMEFFECTP,inf);
				break;
			case 0x0c:	/* set channel volume */
				if(inf<=64) UniPTEffect(0xc,inf);
				break;
			case 0x0d:	/* volume slide */
				UniEffect(UNI_S3MEFFECTD,inf);
				break;
			case 0x0e:	/* fine volume slide */
				if(inf) {
					if(inf>>4)
						UniEffect(UNI_S3MEFFECTD,0x0f|inf);
					else
						UniEffect(UNI_S3MEFFECTD,0xf0|inf);
				} else
					UniEffect(UNI_S3MEFFECTD,0);
				break;
			case 0x0f:	/* set finetune */
				UniPTEffect(0xe,0x50|(inf>>4));
				break;
#ifdef MIKMOD_DEBUG
			case 0x10:	/* note slide up */
			case 0x11:	/* not slide down */
				fprintf(stderr,"\rIMF effect 0x10/0x11 (note slide)"
				               " not implemented (eff=%2X inf=%2X)\n",eff,inf);
				break;
#endif
			case 0x12:	/* slide up */
				UniEffect(UNI_S3MEFFECTF,inf);
				break;
			case 0x13:	/* slide down */
				UniEffect(UNI_S3MEFFECTE,inf);
				break;
			case 0x14:	/* fine slide up */
				if (inf) {
					if (inf<0x40)
						UniEffect(UNI_S3MEFFECTF,0xe0|(inf>>2));
					else
						UniEffect(UNI_S3MEFFECTF,0xf0|(inf>>4));
				} else
					UniEffect(UNI_S3MEFFECTF,0);
				break;
			case 0x15:	/* fine slide down */
				if (inf) {
					if (inf<0x40)
						UniEffect(UNI_S3MEFFECTE,0xe0|(inf>>2));
					else
						UniEffect(UNI_S3MEFFECTE,0xf0|(inf>>4));
				} else
					UniEffect(UNI_S3MEFFECTE,0);
				break;
			/* 0x16 set filter cutoff (awe32) */
			/* 0x17 filter side + resonance (awe32) */
			case 0x18:	/* sample offset */
				UniPTEffect(0x9,inf);
				break;
#ifdef MIKMOD_DEBUG
			case 0x19:	/* set fine sample offset */
				fprintf(stderr,"\rIMF effect 0x19 (fine sample offset)"
				               " not implemented (inf=%2X)\n",inf);
				break;
#endif
			case 0x1a:	/* keyoff */
				UniWriteByte(UNI_KEYOFF);
				break;
			case 0x1b:	/* retrig */
				UniEffect(UNI_S3MEFFECTQ,inf);
				break;
			case 0x1c:	/* tremor */
				UniEffect(UNI_S3MEFFECTI,inf);
				break;
			case 0x1d:	/* position jump */
				UniPTEffect(0xb,inf);
				break;
			case 0x1e:	/* pattern break */
				UniPTEffect(0xd,(inf>>4)*10+(inf&0xf));
				break;
			case 0x1f:	/* set master volume */
				if(inf<=64) UniEffect(UNI_XMEFFECTG,inf<<1);
				break;
			case 0x20:	/* master volume slide */
				UniEffect(UNI_XMEFFECTH,inf);
				break;
			case 0x21:	/* extended effects */
				switch(inf>>4) {
					case 0x1:	/* set filter */
					case 0x5:	/* vibrato waveform */
					case 0x8:	/* tremolo waveform */
						UniPTEffect(0xe,inf-0x10);
						break;
					case 0xa:	/* pattern loop */
						UniPTEffect(0xe,0x60|(inf&0xf));
						break;
					case 0xb:	/* pattern delay */
						UniPTEffect(0xe,0xe0|(inf&0xf));
						break;
					case 0x3:	/* glissando */
					case 0xc:	/* note cut */
					case 0xd:	/* note delay */
					case 0xf:	/* invert loop */
						UniPTEffect(0xe,inf);
						break;
					case 0xe:	/* ignore envelope */
						UniEffect(UNI_ITEFFECTS0, 0x77);    /* vol */
						UniEffect(UNI_ITEFFECTS0, 0x79);    /* pan */
						UniEffect(UNI_ITEFFECTS0, 0x7b);    /* pit */
						break;
				}
				break;
			/* 0x22 chorus (awe32) */
			/* 0x23 reverb (awe32) */
		}
}

static UBYTE* IMF_ConvertTrack(IMFNOTE* tr,UWORD rows)
{
	int t;
	UBYTE note,ins;

	UniReset();
	for(t=0;t<rows;t++) {
		note=tr[t].note;
		ins=tr[t].ins;

		if((ins)&&(ins!=255)) UniInstrument(ins-1);
		if(note!=255) {
			if(note==0xa0) {
				UniPTEffect(0xc,0); /* Note cut */
				if(tr[t].eff1==0x0c) tr[t].eff1=0;
				if(tr[t].eff2==0x0c) tr[t].eff2=0;
			} else
				UniNote(((note>>4)*OCTAVE)+(note&0xf));
		}

		IMF_ProcessCmd(tr[t].eff1,tr[t].dat1);
		IMF_ProcessCmd(tr[t].eff2,tr[t].dat2);
		UniNewline();
	}
	return UniDup();
}

static int IMF_Load(int curious)
{
#define IMF_SMPINCR 64
	int t,u,track=0,oldnumsmp;
	IMFCHANNEL channels[32];
	INSTRUMENT *d;
	SAMPLE *q;
	IMFWAVHEADER *wh=NULL,*s=NULL;
	ULONG *nextwav=NULL;
	UWORD wavcnt=0;
	UBYTE id[4];
	(void)curious;

	/* try to read the module header */
	_mm_read_string(mh->songname,32,modreader);
	mh->ordnum=_mm_read_I_UWORD(modreader);
	mh->patnum=_mm_read_I_UWORD(modreader);
	mh->insnum=_mm_read_I_UWORD(modreader);
	mh->flags =_mm_read_I_UWORD(modreader);
	_mm_fseek(modreader,8,SEEK_CUR);
	mh->initspeed =_mm_read_UBYTE(modreader);
	mh->inittempo =_mm_read_UBYTE(modreader);
	mh->mastervol =_mm_read_UBYTE(modreader);
	mh->mastermult=_mm_read_UBYTE(modreader);
	_mm_fseek(modreader,64,SEEK_SET);

	if(_mm_eof(modreader)) {
		_mm_errno = MMERR_LOADING_HEADER;
		return 0;
	}

	/* set module variables */
	of.songname=DupStr(mh->songname,31,1);
	of.modtype=MikMod_strdup(IMF_Version);
	of.numpat=mh->patnum;
	of.numins=mh->insnum;
	of.reppos=0;
	of.initspeed=mh->initspeed;
	of.inittempo=mh->inittempo;
	of.initvolume=mh->mastervol<<1;
	of.flags |= UF_INST | UF_ARPMEM | UF_PANNING;
	if(mh->flags&1) of.flags |= UF_LINEAR;
	of.bpmlimit=32;

	/* read channel information */
	of.numchn=0;
	memset(remap,-1,32*sizeof(UBYTE));
	for(t=0;t<32;t++) {
		_mm_read_string(channels[t].name,12,modreader);
		channels[t].chorus=_mm_read_UBYTE(modreader);
		channels[t].reverb=_mm_read_UBYTE(modreader);
		channels[t].pan   =_mm_read_UBYTE(modreader);
		channels[t].status=_mm_read_UBYTE(modreader);
	}
	/* bug in Imago Orpheus ? If only channel 1 is enabled, in fact we have to
	   enable 16 channels */
	if(!channels[0].status) {
		for(t=1;t<16;t++) if(channels[t].status!=1) break;
		if(t==16) for(t=1;t<16;t++) channels[t].status=0;
	}
	for(t=0;t<32;t++) {
		if(channels[t].status!=2)
			remap[t]=of.numchn++;
		else
			remap[t]=-1;
	}
	for(t=0;t<32;t++)
		if(remap[t]!=-1) {
			of.panning[remap[t]]=channels[t].pan;
			of.chanvol[remap[t]]=channels[t].status?0:64;
		}

	if(_mm_eof(modreader)) {
		_mm_errno = MMERR_LOADING_HEADER;
		return 0;
	}

	/* read order list */
	_mm_read_UBYTES(mh->orders,256,modreader);
	if(_mm_eof(modreader)) {
		_mm_errno = MMERR_LOADING_HEADER;
		return 0;
	}

	of.numpos=0;
	for(t=0;t<mh->ordnum;t++)
		if(mh->orders[t]!=0xff) of.numpos++;
	if(!AllocPositions(of.numpos)) return 0;
	for(t=u=0;t<mh->ordnum;t++)
		if(mh->orders[t]!=0xff) of.positions[u++]=mh->orders[t];
	for(t=0;t<of.numpos;t++) {
		if (of.positions[t]>of.numpat) { /* SANITIY CHECK */
		/*	fprintf(stderr,"position[%d]=%d > numpat=%d\n",t,of.positions[t],of.numpat);*/
			_mm_errno = MMERR_LOADING_HEADER;
			return 0;
		}
	}

	/* load pattern info */
	of.numtrk=of.numpat*of.numchn;
	if(!AllocTracks()) return 0;
	if(!AllocPatterns()) return 0;

	for(t=0;t<of.numpat;t++) {
		SLONG size;
		UWORD rows;

		size=(SLONG)_mm_read_I_UWORD(modreader);
		rows=_mm_read_I_UWORD(modreader);
		if((rows>256)||(size<4)) {
			_mm_errno=MMERR_LOADING_PATTERN;
			return 0;
		}

		of.pattrows[t]=rows;
		if(!IMF_ReadPattern(size-4,rows)) return 0;
		for(u=0;u<of.numchn;u++)
			if(!(of.tracks[track++]=IMF_ConvertTrack(&imfpat[u*256],rows)))
				return 0;
	}

	/* load instruments */
	if(!AllocInstruments()) return 0;
	d=of.instruments;

	for(oldnumsmp=t=0;t<of.numins;t++) {
		IMFINSTHEADER ih;

		memset(d->samplenumber,0xff,INSTNOTES*sizeof(UWORD));

		/* read instrument header */
		_mm_read_string(ih.name,32,modreader);
		d->insname=DupStr(ih.name,31,1);
		_mm_read_UBYTES(ih.what,IMFNOTECNT,modreader);
		_mm_fseek(modreader,8,SEEK_CUR);
		_mm_read_I_UWORDS(ih.volenv,IMFENVCNT,modreader);
		_mm_read_I_UWORDS(ih.panenv,IMFENVCNT,modreader);
		_mm_read_I_UWORDS(ih.pitenv,IMFENVCNT,modreader);

#if defined __STDC__ || defined _MSC_VER || defined __WATCOMC__ || defined MPW_C
#define IMF_FinishLoadingEnvelope(name)					\
		ih. name##pts=_mm_read_UBYTE(modreader);		\
		ih. name##sus=_mm_read_UBYTE(modreader);		\
		ih. name##beg=_mm_read_UBYTE(modreader);		\
		ih. name##end=_mm_read_UBYTE(modreader);		\
		ih. name##flg=_mm_read_UBYTE(modreader);		\
		_mm_skip_BYTE(modreader);						\
		_mm_skip_BYTE(modreader);						\
		_mm_skip_BYTE(modreader)
#else
#define IMF_FinishLoadingEnvelope(name)				\
		ih. name/**/pts=_mm_read_UBYTE(modreader);	\
		ih. name/**/sus=_mm_read_UBYTE(modreader);	\
		ih. name/**/beg=_mm_read_UBYTE(modreader);	\
		ih. name/**/end=_mm_read_UBYTE(modreader);	\
		ih. name/**/flg=_mm_read_UBYTE(modreader);	\
		_mm_skip_BYTE(modreader);					\
		_mm_skip_BYTE(modreader);					\
		_mm_skip_BYTE(modreader)
#endif

		IMF_FinishLoadingEnvelope(vol);
		IMF_FinishLoadingEnvelope(pan);
		IMF_FinishLoadingEnvelope(pit);

		ih.volfade=_mm_read_I_UWORD(modreader);
		ih.numsmp =_mm_read_I_UWORD(modreader);

		_mm_read_UBYTES(id,4,modreader);
		/* Looks like Imago Orpheus forgets the signature for empty
		   instruments following a multi-sample instrument... */
		if(memcmp(id,"II10",4) &&
		   (oldnumsmp && memcmp(id,"\x0\x0\x0\x0",4))) {
			if(nextwav) MikMod_free(nextwav);
			if(wh) MikMod_free(wh);
			_mm_errno=MMERR_LOADING_SAMPLEINFO;
			return 0;
		}
		oldnumsmp=ih.numsmp;

		if((ih.numsmp>16)||(ih.volpts>IMFENVCNT/2)||(ih.panpts>IMFENVCNT/2)||
		   (ih.pitpts>IMFENVCNT/2)||(_mm_eof(modreader))) {
			if(nextwav) MikMod_free(nextwav);
			if(wh) MikMod_free(wh);
			_mm_errno=MMERR_LOADING_SAMPLEINFO;
			return 0;
		}

		for(u=0;u<IMFNOTECNT;u++)
			d->samplenumber[u]=ih.what[u]>ih.numsmp?0xffff:ih.what[u]+of.numsmp;
		d->volfade=ih.volfade;

#if defined __STDC__ || defined _MSC_VER || defined __WATCOMC__ || defined MPW_C
#define IMF_ProcessEnvelope(name) 									\
		for (u = 0; u < (IMFENVCNT >> 1); u++) {					\
			d-> name##env[u].pos = ih. name##env[u << 1];			\
			d-> name##env[u].val = ih. name##env[(u << 1)+ 1];		\
		}															\
		if (ih. name##flg&1) d-> name##flg|=EF_ON;					\
		if (ih. name##flg&2) d-> name##flg|=EF_SUSTAIN;				\
		if (ih. name##flg&4) d-> name##flg|=EF_LOOP;				\
		d-> name##susbeg=d-> name##susend=ih. name##sus;			\
		d-> name##beg=ih. name##beg;								\
		d-> name##end=ih. name##end;								\
		d-> name##pts=ih. name##pts;								\
																	\
		if ((d-> name##flg&EF_ON)&&(d-> name##pts<2))				\
			d-> name##flg&=~EF_ON
#else
#define IMF_ProcessEnvelope(name) 									\
		for (u = 0; u < (IMFENVCNT >> 1); u++) {					\
			d-> name/**/env[u].pos = ih. name/**/env[u << 1];		\
			d-> name/**/env[u].val = ih. name/**/env[(u << 1)+ 1];	\
		}															\
		if (ih. name/**/flg&1) d-> name/**/flg|=EF_ON;				\
		if (ih. name/**/flg&2) d-> name/**/flg|=EF_SUSTAIN;			\
		if (ih. name/**/flg&4) d-> name/**/flg|=EF_LOOP;			\
		d-> name/**/susbeg=d-> name/**/susend=ih. name/**/sus;		\
		d-> name/**/beg=ih. name/**/beg;							\
		d-> name/**/end=ih. name/**/end;							\
		d-> name/**/pts=ih. name/**/pts;							\
																	\
		if ((d-> name/**/flg&EF_ON)&&(d-> name/**/pts<2))			\
			d-> name/**/flg&=~EF_ON
#endif

		IMF_ProcessEnvelope(vol);
		IMF_ProcessEnvelope(pan);
		IMF_ProcessEnvelope(pit);
#undef IMF_ProcessEnvelope

		if(ih.pitflg&1) {
			d->pitflg&=~EF_ON;
#ifdef MIKMOD_DEBUG
			fprintf(stderr, "\rFilter envelopes not supported yet\n");
#endif
		}

		/* gather sample information */
		for(u=0;u<ih.numsmp;u++,s++) {
			/* allocate more room for sample information if necessary */
			if(of.numsmp+u==wavcnt) {
				wavcnt+=IMF_SMPINCR;
				if(!(nextwav=(ULONG*)MikMod_realloc(nextwav,wavcnt*sizeof(ULONG)))) {
					if(wh) MikMod_free(wh);
					_mm_errno=MMERR_OUT_OF_MEMORY;
					return 0;
				}
				if(!(wh=(IMFWAVHEADER*)MikMod_realloc(wh,wavcnt*sizeof(IMFWAVHEADER)))) {
					MikMod_free(nextwav);
					_mm_errno=MMERR_OUT_OF_MEMORY;
					return 0;
				}
				s=wh+(wavcnt-IMF_SMPINCR);
			}

			_mm_read_string(s->samplename,13,modreader);
			_mm_skip_BYTE(modreader);_mm_skip_BYTE(modreader);_mm_skip_BYTE(modreader);
			s->length    =_mm_read_I_ULONG(modreader);
			s->loopstart =_mm_read_I_ULONG(modreader);
			s->loopend   =_mm_read_I_ULONG(modreader);
			s->samplerate=_mm_read_I_ULONG(modreader);
			s->volume    =_mm_read_UBYTE(modreader)&0x7f;
			s->pan       =_mm_read_UBYTE(modreader);
			_mm_fseek(modreader,14,SEEK_CUR);
			s->flags     =_mm_read_UBYTE(modreader);
			_mm_fseek(modreader,11,SEEK_CUR);
			_mm_read_UBYTES(id,4,modreader);
			if(((memcmp(id,"IS10",4))&&(memcmp(id,"IW10",4)))||
			   (_mm_eof(modreader))) {
				MikMod_free(nextwav);MikMod_free(wh);
				_mm_errno=MMERR_LOADING_SAMPLEINFO;
				return 0;
			}
			nextwav[of.numsmp+u]=_mm_ftell(modreader);
			_mm_fseek(modreader,s->length,SEEK_CUR);
		}

		of.numsmp+=ih.numsmp;
		d++;
	}

	/* sanity check */
	if(!of.numsmp) {
		if(nextwav) MikMod_free(nextwav);
		if(wh) MikMod_free(wh);
		_mm_errno=MMERR_LOADING_SAMPLEINFO;
		return 0;
	}

	/* load samples */
	if(!AllocSamples()) {
		MikMod_free(nextwav);MikMod_free(wh);
		return 0;
	}
	if(!AllocLinear()) {
		MikMod_free(nextwav);MikMod_free(wh);
		return 0;
	}
	q=of.samples;
	s=wh;
	for(u=0;u<of.numsmp;u++,s++,q++) {
		q->samplename=DupStr(s->samplename,12,1);
		q->length   =s->length;
		q->loopstart=s->loopstart;
		q->loopend  =s->loopend;
		q->volume   =s->volume;
		q->speed    =s->samplerate;
		if(of.flags&UF_LINEAR)
			q->speed=speed_to_finetune(s->samplerate<<1,u);
		q->panning  =s->pan;
		q->seekpos  =nextwav[u];

		q->flags|=SF_SIGNED;
		if(s->flags&0x1) q->flags|=SF_LOOP;
		if(s->flags&0x2) q->flags|=SF_BIDI;
		if(s->flags&0x8) q->flags|=SF_OWNPAN;
		if(s->flags&0x4) {
			q->flags|=SF_16BITS;
			q->length   >>=1;
			q->loopstart>>=1;
			q->loopend  >>=1;
		}
	}

	d=of.instruments;
	s=wh;
	for(u=0;u<of.numins;u++,d++) {
		for(t=0;t<IMFNOTECNT;t++) {
			if(d->samplenumber[t]>=of.numsmp)
				d->samplenote[t]=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);
			} else
				d->samplenote[t]=t;
		}
	}

	MikMod_free(wh);MikMod_free(nextwav);
	return 1;
}

static CHAR *IMF_LoadTitle(void)
{
	CHAR s[31];

	_mm_fseek(modreader,0,SEEK_SET);
	if(!_mm_read_UBYTES(s,31,modreader)) return NULL;

	return(DupStr(s,31,1));
}

/*========== Loader information */

MIKMODAPI MLOADER load_imf={
	NULL,
	"IMF",
	"IMF (Imago Orpheus)",
	IMF_Init,
	IMF_Test,
	IMF_Load,
	IMF_Cleanup,
	IMF_LoadTitle
};

/* ex:set ts=4: */