summaryrefslogtreecommitdiffstats
path: root/apps/plugins/mikmod/load_stx.c
blob: ac6e51f4c7096ba0ef4a94655356a8aae493e85f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/*	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: */