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rockbox/apps/plugins/mikmod/load_s3m.c
Bertrik Sikken c26ab37aca mikmod plugin: make functions static when possible 
Change-Id: Ic0102071318c55c19952029be6998ecf5f33eb98
2012-04-14 17:31:14 +02:00

470 lines
12 KiB
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_s3m.c,v 1.3 2005/04/07 19:57:38 realtech Exp $
Screamtracker (S3M) 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 */
/* header */
typedef struct S3MHEADER {
CHAR songname[28];
UBYTE t1a;
UBYTE type;
UBYTE unused1[2];
UWORD ordnum;
UWORD insnum;
UWORD patnum;
UWORD flags;
UWORD tracker;
UWORD fileformat;
CHAR scrm[4];
UBYTE mastervol;
UBYTE initspeed;
UBYTE inittempo;
UBYTE mastermult;
UBYTE ultraclick;
UBYTE pantable;
UBYTE unused2[8];
UWORD special;
UBYTE channels[32];
} S3MHEADER;
/* sample information */
typedef struct S3MSAMPLE {
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];
} S3MSAMPLE;
typedef struct S3MNOTE {
UBYTE note,ins,vol,cmd,inf;
} S3MNOTE;
/*========== Loader variables */
static S3MNOTE *s3mbuf = NULL; /* pointer to a complete S3M pattern */
static S3MHEADER *mh = NULL;
static UWORD *paraptr = NULL; /* parapointer array (see S3M docs) */
static unsigned int tracker; /* tracker id */
/* tracker identifiers */
#define NUMTRACKERS 4
static CHAR* S3M_Version[] = {
"Screamtracker x.xx",
"Imago Orpheus x.xx (S3M format)",
"Impulse Tracker x.xx (S3M format)",
"Unknown tracker x.xx (S3M format)",
"Impulse Tracker 2.14p3 (S3M format)",
"Impulse Tracker 2.14p4 (S3M format)"
};
/* version number position in above array */
static int numeric[NUMTRACKERS]={14,14,16,16};
/*========== Loader code */
static int S3M_Test(void)
{
UBYTE id[4];
_mm_fseek(modreader,0x2c,SEEK_SET);
if(!_mm_read_UBYTES(id,4,modreader)) return 0;
if(!memcmp(id,"SCRM",4)) return 1;
return 0;
}
static int S3M_Init(void)
{
if(!(s3mbuf=(S3MNOTE*)MikMod_malloc(32*64*sizeof(S3MNOTE)))) return 0;
if(!(mh=(S3MHEADER*)MikMod_malloc(sizeof(S3MHEADER)))) return 0;
if(!(poslookup=(UBYTE*)MikMod_malloc(sizeof(UBYTE)*256))) return 0;
memset(poslookup,-1,256);
return 1;
}
static void S3M_Cleanup(void)
{
MikMod_free(s3mbuf);
MikMod_free(paraptr);
MikMod_free(poslookup);
MikMod_free(mh);
MikMod_free(origpositions);
}
/* Because so many s3m files have 16 channels as the set number used, but really
only use far less (usually 8 to 12 still), I had to make this function, which
determines the number of channels that are actually USED by a pattern.
For every channel that's used, it sets the appropriate array entry of the
global variable 'remap'
NOTE: You must first seek to the file location of the pattern before calling
this procedure.
Returns 1 on fail. */
static int S3M_GetNumChannels(void)
{
int row=0,flag,ch;
while(row<64) {
flag=_mm_read_UBYTE(modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_PATTERN;
return 1;
}
if(flag) {
ch=flag&31;
if(mh->channels[ch]<32) remap[ch] = 0;
if(flag&32) {(void)_mm_read_UBYTE(modreader);(void)_mm_read_UBYTE(modreader);}
if(flag&64) (void)_mm_read_UBYTE(modreader);
if(flag&128){(void)_mm_read_UBYTE(modreader);(void)_mm_read_UBYTE(modreader);}
} else row++;
}
return 0;
}
static int S3M_ReadPattern(void)
{
int row=0,flag,ch;
S3MNOTE *n,dummy;
/* clear pattern data */
memset(s3mbuf,255,32*64*sizeof(S3MNOTE));
while(row<64) {
flag=_mm_read_UBYTE(modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_PATTERN;
return 0;
}
if(flag) {
ch=remap[flag&31];
if(ch!=-1)
n=&s3mbuf[(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* S3M_ConvertTrack(S3MNOTE* tr)
{
int t;
UniReset();
for(t=0;t<64;t++) {
UBYTE note,ins,vol;
note=tr[t].note;
ins=tr[t].ins;
vol=tr[t].vol;
if((ins)&&(ins!=255)) UniInstrument(ins-1);
if(note!=255) {
if(note==254) {
UniPTEffect(0xc,0); /* note cut command */
vol=255;
} else
UniNote(((note>>4)*OCTAVE)+(note&0xf)); /* normal note */
}
if(vol<255) UniPTEffect(0xc,vol);
S3MIT_ProcessCmd(tr[t].cmd,tr[t].inf,
tracker == 1 ? S3MIT_OLDSTYLE | S3MIT_SCREAM : S3MIT_OLDSTYLE);
UniNewline();
}
return UniDup();
}
static int S3M_Load(int curious)
{
int t,u,track = 0;
SAMPLE *q;
UBYTE pan[32];
/* try to read module header */
_mm_read_string(mh->songname,28,modreader);
mh->t1a =_mm_read_UBYTE(modreader);
mh->type =_mm_read_UBYTE(modreader);
_mm_read_UBYTES(mh->unused1,2,modreader);
mh->ordnum =_mm_read_I_UWORD(modreader);
mh->insnum =_mm_read_I_UWORD(modreader);
mh->patnum =_mm_read_I_UWORD(modreader);
mh->flags =_mm_read_I_UWORD(modreader);
mh->tracker =_mm_read_I_UWORD(modreader);
mh->fileformat =_mm_read_I_UWORD(modreader);
_mm_read_string(mh->scrm,4,modreader);
mh->mastervol =_mm_read_UBYTE(modreader);
mh->initspeed =_mm_read_UBYTE(modreader);
mh->inittempo =_mm_read_UBYTE(modreader);
mh->mastermult =_mm_read_UBYTE(modreader);
mh->ultraclick =_mm_read_UBYTE(modreader);
mh->pantable =_mm_read_UBYTE(modreader);
_mm_read_UBYTES(mh->unused2,8,modreader);
mh->special =_mm_read_I_UWORD(modreader);
_mm_read_UBYTES(mh->channels,32,modreader);
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
/* then we can decide the module type */
tracker=mh->tracker>>12;
if((!tracker)||(tracker>=NUMTRACKERS))
tracker=NUMTRACKERS-1; /* unknown tracker */
else {
if(mh->tracker>=0x3217)
tracker=NUMTRACKERS+1; /* IT 2.14p4 */
else if(mh->tracker>=0x3216)
tracker=NUMTRACKERS; /* IT 2.14p3 */
else tracker--;
}
of.modtype = StrDup(S3M_Version[tracker]);
if(tracker<NUMTRACKERS) {
of.modtype[numeric[tracker]] = ((mh->tracker>>8) &0xf)+'0';
of.modtype[numeric[tracker]+2] = ((mh->tracker>>4)&0xf)+'0';
of.modtype[numeric[tracker]+3] = ((mh->tracker)&0xf)+'0';
}
/* set module variables */
of.songname = DupStr(mh->songname,28,0);
of.numpat = mh->patnum;
of.reppos = 0;
of.numins = of.numsmp = mh->insnum;
of.initspeed = mh->initspeed;
of.inittempo = mh->inittempo;
of.initvolume = mh->mastervol<<1;
of.flags |= UF_ARPMEM | UF_PANNING;
if((mh->tracker==0x1300)||(mh->flags&64))
of.flags|=UF_S3MSLIDES;
of.bpmlimit = 32;
/* read the order data */
if(!AllocPositions(mh->ordnum)) return 0;
if(!(origpositions=MikMod_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/*mh->patnum-1*/;
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
poslookupcnt=mh->ordnum;
S3MIT_CreateOrders(curious);
if(!(paraptr=(UWORD*)MikMod_malloc((of.numins+of.numpat)*sizeof(UWORD))))
return 0;
/* read the instrument+pattern parapointers */
_mm_read_I_UWORDS(paraptr,of.numins+of.numpat,modreader);
if(mh->pantable==252) {
/* read the panning table (ST 3.2 addition. See below for further
portions of channel panning [past reampper]). */
_mm_read_UBYTES(pan,32,modreader);
}
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_HEADER;
return 0;
}
/* load samples */
if(!AllocSamples()) return 0;
q = of.samples;
for(t=0;t<of.numins;t++) {
S3MSAMPLE 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);
/* ScreamTracker imposes a 64000 bytes (not 64k !) limit */
if (s.length > 64000)
s.length = 64000;
if(_mm_eof(modreader)) {
_mm_errno = MMERR_LOADING_SAMPLEINFO;
return 0;
}
q->samplename = DupStr(s.sampname,28,0);
q->speed = s.c2spd;
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;
if(s.flags&1) q->flags |= SF_LOOP;
if(s.flags&4) q->flags |= SF_16BITS;
if(mh->fileformat==1) q->flags |= SF_SIGNED;
/* don't load sample if it doesn't have the SCRS tag */
if(memcmp(s.scrs,"SCRS",4)) q->length = 0;
q++;
}
/* determine the number of channels actually used. */
of.numchn = 0;
memset(remap,-1,32*sizeof(UBYTE));
for(t=0;t<of.numpat;t++) {
/* seek to pattern position (+2 skip pattern length) */
_mm_fseek(modreader,(long)((paraptr[of.numins+t])<<4)+2,SEEK_SET);
if(S3M_GetNumChannels()) return 0;
}
/* build the remap array */
for(t=0;t<32;t++)
if(!remap[t])
remap[t]=of.numchn++;
/* set panning positions after building remap chart! */
for(t=0;t<32;t++)
if((mh->channels[t]<32)&&(remap[t]!=-1)) {
if(mh->channels[t]<8)
of.panning[remap[t]]=0x30;
else
of.panning[remap[t]]=0xc0;
}
if(mh->pantable==252)
/* set panning positions according to panning table (new for st3.2) */
for(t=0;t<32;t++)
if((pan[t]&0x20)&&(mh->channels[t]<32)&&(remap[t]!=-1))
of.panning[remap[t]]=(pan[t]&0xf)<<4;
/* 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)+2,SEEK_SET);
if(!S3M_ReadPattern()) return 0;
for(u=0;u<of.numchn;u++)
if(!(of.tracks[track++]=S3M_ConvertTrack(&s3mbuf[u*64]))) return 0;
}
return 1;
}
static CHAR *S3M_LoadTitle(void)
{
CHAR s[28];
_mm_fseek(modreader,0,SEEK_SET);
if(!_mm_read_UBYTES(s,28,modreader)) return NULL;
return(DupStr(s,28,0));
}
/*========== Loader information */
MIKMODAPI MLOADER load_s3m={
NULL,
"S3M",
"S3M (Scream Tracker 3)",
S3M_Init,
S3M_Test,
S3M_Load,
S3M_Cleanup,
S3M_LoadTitle
};
/* ex:set ts=4: */
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