load_s3m.c
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上传日期:2014-04-03
资源大小:7248k
文件大小:12k
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_s3m.c,v 1.1.1.1 2004/01/21 01:36:35 raph 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 */
- BOOL 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;
- }
- BOOL S3M_Init(void)
- {
- if(!(s3mbuf=(S3MNOTE*)_mm_malloc(32*64*sizeof(S3MNOTE)))) return 0;
- if(!(mh=(S3MHEADER*)_mm_malloc(sizeof(S3MHEADER)))) return 0;
- if(!(poslookup=(UBYTE*)_mm_malloc(sizeof(UBYTE)*256))) return 0;
- memset(poslookup,-1,256);
- return 1;
- }
- void S3M_Cleanup(void)
- {
- _mm_free(s3mbuf);
- _mm_free(paraptr);
- _mm_free(poslookup);
- _mm_free(mh);
- _mm_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 BOOL 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) {_mm_read_UBYTE(modreader);_mm_read_UBYTE(modreader);}
- if(flag&64) _mm_read_UBYTE(modreader);
- if(flag&128){_mm_read_UBYTE(modreader);_mm_read_UBYTE(modreader);}
- } else row++;
- }
- return 0;
- }
- static BOOL 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();
- }
- BOOL S3M_Load(BOOL 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=_mm_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*)_mm_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;
- }
- 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: */