286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/* MikMod sound library
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(c) 1998, 1999, 2000, 2001, 2002 Miodrag Vallat and others - see file
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AUTHORS for complete list.
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA.
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*/
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/*==============================================================================
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$Id: load_mtm.c,v 1.3 2005/04/07 19:57:38 realtech Exp $
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MTM module loader
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==============================================================================*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_MEMORY_H
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#include <memory.h>
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#endif
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#include <string.h>
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#include "mikmod_internals.h"
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#ifdef SUNOS
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extern int fprintf(FILE *, const char *, ...);
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#endif
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/*========== Module structure */
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typedef struct MTMHEADER {
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UBYTE id[3]; /* MTM file marker */
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UBYTE version; /* upper major, lower nibble minor version number */
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CHAR songname[20]; /* ASCIIZ songname */
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UWORD numtracks; /* number of tracks saved */
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UBYTE lastpattern; /* last pattern number saved */
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UBYTE lastorder; /* last order number to play (songlength-1) */
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UWORD commentsize; /* length of comment field */
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UBYTE numsamples; /* number of samples saved */
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UBYTE attribute; /* attribute byte (unused) */
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UBYTE beatspertrack;
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UBYTE numchannels; /* number of channels used */
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UBYTE panpos[32]; /* voice pan positions */
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} MTMHEADER;
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typedef struct MTMSAMPLE {
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CHAR samplename[22];
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ULONG length;
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ULONG reppos;
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ULONG repend;
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UBYTE finetune;
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UBYTE volume;
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UBYTE attribute;
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} MTMSAMPLE;
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typedef struct MTMNOTE {
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UBYTE a,b,c;
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} MTMNOTE;
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/*========== Loader variables */
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static MTMHEADER *mh = NULL;
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static MTMNOTE *mtmtrk = NULL;
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static UWORD pat[32];
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static CHAR MTM_Version[] = "MTM";
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/*========== Loader code */
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static int MTM_Test(void)
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{
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UBYTE id[3];
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if(!_mm_read_UBYTES(id,3,modreader)) return 0;
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if(!memcmp(id,"MTM",3)) return 1;
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return 0;
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}
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static int MTM_Init(void)
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{
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if(!(mtmtrk=(MTMNOTE*)MikMod_calloc(64,sizeof(MTMNOTE)))) return 0;
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if(!(mh=(MTMHEADER*)MikMod_malloc(sizeof(MTMHEADER)))) return 0;
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return 1;
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}
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static void MTM_Cleanup(void)
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{
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MikMod_free(mtmtrk);
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MikMod_free(mh);
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}
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static UBYTE* MTM_Convert(void)
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{
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int t;
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UBYTE a,b,inst,note,eff,dat;
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UniReset();
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for(t=0;t<64;t++) {
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a=mtmtrk[t].a;
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b=mtmtrk[t].b;
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inst=((a&0x3)<<4)|(b>>4);
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note=a>>2;
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eff=b&0xf;
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dat=mtmtrk[t].c;
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if(inst) UniInstrument(inst-1);
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if(note) UniNote(note+2*OCTAVE);
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/* MTM bug workaround : when the effect is volslide, slide-up *always*
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overrides slide-down. */
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if(eff==0xa && (dat&0xf0)) dat&=0xf0;
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/* Convert pattern jump from Dec to Hex */
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if(eff==0xd)
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dat=(((dat&0xf0)>>4)*10)+(dat&0xf);
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UniPTEffect(eff,dat);
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UniNewline();
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}
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return UniDup();
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}
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static int MTM_Load(int curious)
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{
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int t,u;
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MTMSAMPLE s;
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SAMPLE *q;
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(void)curious;
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/* try to read module header */
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_mm_read_UBYTES(mh->id,3,modreader);
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mh->version =_mm_read_UBYTE(modreader);
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_mm_read_string(mh->songname,20,modreader);
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mh->numtracks =_mm_read_I_UWORD(modreader);
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mh->lastpattern =_mm_read_UBYTE(modreader);
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mh->lastorder =_mm_read_UBYTE(modreader);
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mh->commentsize =_mm_read_I_UWORD(modreader);
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mh->numsamples =_mm_read_UBYTE(modreader);
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mh->attribute =_mm_read_UBYTE(modreader);
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mh->beatspertrack=_mm_read_UBYTE(modreader);
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mh->numchannels =_mm_read_UBYTE(modreader);
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_mm_read_UBYTES(mh->panpos,32,modreader);
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if(_mm_eof(modreader)) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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/* set module variables */
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of.initspeed = 6;
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of.inittempo = 125;
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of.modtype = StrDup(MTM_Version);
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of.numchn = mh->numchannels;
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of.numtrk = mh->numtracks+1; /* get number of channels */
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of.songname = DupStr(mh->songname,20,1); /* make a cstr of songname */
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of.numpos = mh->lastorder+1; /* copy the songlength */
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of.numpat = mh->lastpattern+1;
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of.reppos = 0;
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of.flags |= UF_PANNING;
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for(t=0;t<32;t++) of.panning[t]=mh->panpos[t]<< 4;
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of.numins=of.numsmp=mh->numsamples;
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if(!AllocSamples()) return 0;
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q=of.samples;
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for(t=0;t<of.numins;t++) {
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/* try to read sample info */
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_mm_read_string(s.samplename,22,modreader);
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s.length =_mm_read_I_ULONG(modreader);
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s.reppos =_mm_read_I_ULONG(modreader);
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s.repend =_mm_read_I_ULONG(modreader);
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s.finetune =_mm_read_UBYTE(modreader);
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s.volume =_mm_read_UBYTE(modreader);
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s.attribute =_mm_read_UBYTE(modreader);
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if(_mm_eof(modreader)) {
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_mm_errno = MMERR_LOADING_SAMPLEINFO;
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return 0;
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}
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q->samplename = DupStr(s.samplename,22,1);
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q->seekpos = 0;
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q->speed = finetune[s.finetune];
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q->length = s.length;
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q->loopstart = s.reppos;
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q->loopend = s.repend;
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q->volume = s.volume;
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if((s.repend-s.reppos)>2) q->flags |= SF_LOOP;
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if(s.attribute&1) {
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/* If the sample is 16-bits, convert the length and replen
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byte-values into sample-values */
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q->flags|=SF_16BITS;
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q->length>>=1;
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q->loopstart>>=1;
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q->loopend>>=1;
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}
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q++;
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}
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if(!AllocPositions(of.numpos)) return 0;
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for(t=0;t<of.numpos;t++)
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of.positions[t]=_mm_read_UBYTE(modreader);
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for(;t<128;t++) (void)_mm_read_UBYTE(modreader);
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if(_mm_eof(modreader)) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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if(!AllocTracks()) return 0;
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if(!AllocPatterns()) return 0;
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of.tracks[0]=MTM_Convert(); /* track 0 is empty */
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for(t=1;t<of.numtrk;t++) {
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int s;
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for(s=0;s<64;s++) {
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mtmtrk[s].a=_mm_read_UBYTE(modreader);
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mtmtrk[s].b=_mm_read_UBYTE(modreader);
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mtmtrk[s].c=_mm_read_UBYTE(modreader);
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}
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if(_mm_eof(modreader)) {
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_mm_errno = MMERR_LOADING_TRACK;
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return 0;
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}
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if(!(of.tracks[t]=MTM_Convert())) return 0;
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}
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for(t=0;t<of.numpat;t++) {
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_mm_read_I_UWORDS(pat,32,modreader);
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for(u=0;u<of.numchn;u++)
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of.patterns[((long)t*of.numchn)+u]=pat[u];
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}
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/* read comment field */
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if(mh->commentsize)
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if(!ReadLinedComment(mh->commentsize, 40)) return 0;
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return 1;
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}
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static CHAR *MTM_LoadTitle(void)
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{
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CHAR s[20];
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_mm_fseek(modreader,4,SEEK_SET);
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if(!_mm_read_UBYTES(s,20,modreader)) return NULL;
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return(DupStr(s,20,1));
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}
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/*========== Loader information */
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MIKMODAPI MLOADER load_mtm={
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NULL,
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"MTM",
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"MTM (MultiTracker Module editor)",
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MTM_Init,
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MTM_Test,
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MTM_Load,
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MTM_Cleanup,
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MTM_LoadTitle
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};
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/* ex:set ts=4: */
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