load_stx.c
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上传日期:2014-04-03
资源大小:7248k
文件大小:11k
源码类别:
Windows CE
开发平台:
C/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: load_stx.c,v 1.1.1.1 2004/01/21 01:36:35 raph 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 BOOL 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 BOOL STX_Init(void)
- {
- if(!(stxbuf=(STXNOTE*)_mm_malloc(4*64*sizeof(STXNOTE)))) return 0;
- if(!(mh=(STXHEADER*)_mm_malloc(sizeof(STXHEADER)))) return 0;
- if(!(poslookup=(UBYTE*)_mm_malloc(sizeof(UBYTE)*256))) return 0;
- memset(poslookup,-1,256);
- return 1;
- }
- static void STX_Cleanup(void)
- {
- _mm_free(stxbuf);
- _mm_free(paraptr);
- _mm_free(poslookup);
- _mm_free(mh);
- }
- static BOOL 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 BOOL STX_Load(BOOL 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*)_mm_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: */