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- /*
-
- Name:
- LOAD_M15.C
-
- Description:
- 15 instrument MOD loader
-
- Portability:
- All systems - all compilers (hopefully)
-
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include "mikmod.h"
-
- /*************************************************************************
- *************************************************************************/
-
-
- typedef struct MSAMPINFO{ /* sample header as it appears in a module */
- char samplename[22];
- UWORD length;
- UBYTE finetune;
- UBYTE volume;
- UWORD reppos;
- UWORD replen;
- } MSAMPINFO;
-
-
- typedef struct MODULEHEADER{ /* verbatim module header */
- char songname[20]; /* the songname.. */
- MSAMPINFO samples[15]; /* all sampleinfo */
- UBYTE songlength; /* number of patterns used */
- UBYTE magic1; /* should be 127 */
- UBYTE positions[128]; /* which pattern to play at pos */
- } MODULEHEADER;
-
-
- typedef struct MODNOTE{
- UBYTE a,b,c,d;
- } MODNOTE;
-
-
- /*************************************************************************
- *************************************************************************/
-
- static MODULEHEADER *mh; /* raw as-is module header */
- static MODNOTE *patbuf;
-
-
- static BOOL LoadModuleHeader(MODULEHEADER *mh)
- {
- int t;
-
- _mm_read_str(mh->songname,20,modfp);
-
- for(t=0;t<15;t++){
- MSAMPINFO *s= &mh->samples[t];
- _mm_read_str(s->samplename,22,modfp);
- s->length =_mm_read_M_UWORD(modfp);
- s->finetune =_mm_read_UBYTE(modfp);
- s->volume =_mm_read_UBYTE(modfp);
- s->reppos =_mm_read_M_UWORD(modfp);
- s->replen =_mm_read_M_UWORD(modfp);
- }
-
- mh->songlength =_mm_read_UBYTE(modfp);
- mh->magic1 =_mm_read_UBYTE(modfp); /* should be 127 */
- _mm_read_UBYTES(mh->positions,128,modfp);
-
- return(!feof(modfp));
- }
-
-
-
- BOOL M15_Test(void)
- {
- int t;
- MODULEHEADER mh;
-
- if(!LoadModuleHeader(&mh)) return 0;
-
- for(t=0;t<15;t++){
-
- /* all finetunes should be zero */
- if(mh.samples[t].finetune!=0) return 0;
-
- /* all volumes should be <=64 */
- if(mh.samples[t].volume>64) return 0;
- }
- if(mh.magic1>127) return 0; /* and magic1 should be <128 */
-
- return 1;
- }
-
-
- BOOL M15_Init(void)
- {
- patbuf=NULL;
- if(!(mh=(MODULEHEADER *)MyCalloc(1,sizeof(MODULEHEADER)))) return 0;
- return 1;
- }
-
-
- void M15_Cleanup(void)
- {
- if(mh!=NULL) free(mh);
- if(patbuf!=NULL) free(patbuf);
- }
-
-
- /*
-
- Old (amiga) noteinfo:
-
- _____byte 1_____ byte2_ _____byte 3_____ byte4_
- / \ / \ / \ / \
- 0000 0000-00000000 0000 0000-00000000
-
- Upper four 12 bits for Lower four Effect command.
- bits of sam- note period. bits of sam-
- ple number. ple number.
-
-
- */
-
-
- UWORD M15_npertab[60]={
-
- /* -> Tuning 0 */
-
- 1712,1616,1524,1440,1356,1280,1208,1140,1076,1016,960,906,
- 856,808,762,720,678,640,604,570,538,508,480,453,
- 428,404,381,360,339,320,302,285,269,254,240,226,
- 214,202,190,180,170,160,151,143,135,127,120,113,
- 107,101,95,90,85,80,75,71,67,63,60,56
- };
-
-
- void M15_ConvertNote(MODNOTE *n)
- {
- UBYTE instrument,effect,effdat,note;
- UWORD period;
-
- /* extract the various information from the 4 bytes that
- make up a single note */
-
- instrument=(n->a&0x10)|(n->c>>4);
- period=(((UWORD)n->a&0xf)<<8)+n->b;
- effect=n->c&0xf;
- effdat=n->d;
-
- /* Convert the period to a note number */
-
- note=0;
- if(period!=0){
- for(note=0;note<60;note++){
- if(period>=M15_npertab[note]) break;
- }
- note++;
- if(note==61) note=0;
- }
-
- if(instrument!=0){
- UniInstrument(instrument-1);
- }
-
- if(note!=0){
- UniNote(note+23);
- }
-
- UniPTEffect(effect,effdat);
- }
-
-
-
- UBYTE *M15_ConvertTrack(MODNOTE *n)
- {
- int t;
-
- UniReset();
- for(t=0;t<64;t++){
- M15_ConvertNote(n);
- UniNewline();
- n+=of.numchn;
- }
- return UniDup();
- }
-
-
-
- BOOL M15_LoadPatterns(void)
- /*
- Loads all patterns of a modfile and converts them into the
- 3 byte format.
- */
- {
- int t,s,tracks=0;
-
- if(!AllocPatterns()) return 0;
- if(!AllocTracks()) return 0;
-
- /* Allocate temporary buffer for loading
- and converting the patterns */
-
- if(!(patbuf=(MODNOTE *)MyCalloc(64U*of.numchn,sizeof(MODNOTE)))) return 0;
-
- for(t=0;t<of.numpat;t++){
-
- /* Load the pattern into the temp buffer
- and convert it */
-
- for(s=0;s<(64U*of.numchn);s++){
- patbuf[s].a=_mm_read_UBYTE(modfp);
- patbuf[s].b=_mm_read_UBYTE(modfp);
- patbuf[s].c=_mm_read_UBYTE(modfp);
- patbuf[s].d=_mm_read_UBYTE(modfp);
- }
-
- for(s=0;s<of.numchn;s++){
- if(!(of.tracks[tracks++]=M15_ConvertTrack(patbuf+s))) return 0;
- }
- }
-
- return 1;
- }
-
-
-
- BOOL M15_Load(void)
- {
- int t;
- INSTRUMENT *d; /* new sampleinfo structure */
- SAMPLE *q;
- MSAMPINFO *s; /* old module sampleinfo */
-
- /* try to read module header */
-
- if(!LoadModuleHeader(mh)){
- myerr=ERROR_LOADING_HEADER;
- return 0;
- }
-
- /* set module variables */
-
- of.initspeed=6;
- of.inittempo=125;
- of.numchn=4; /* get number of channels */
- of.modtype=strdup("15-instrument"); /* get ascii type of mod */
- of.songname=DupStr(mh->songname,20); /* make a cstr of songname */
- of.numpos=mh->songlength; /* copy the songlength */
- memcpy(of.positions,mh->positions,128); /* copy the position array */
-
- /* Count the number of patterns */
-
- of.numpat=0;
-
- for(t=0;t<128;t++){ /* <-- BUGFIX... have to check ALL positions */
- if(of.positions[t] > of.numpat){
- of.numpat=of.positions[t];
- }
- }
- of.numpat++;
- of.numtrk=of.numpat*of.numchn;
-
- /* Finally, init the sampleinfo structures */
-
- of.numins=15;
- if(!AllocInstruments()) return 0;
-
- s=mh->samples; /* init source pointer */
- d=of.instruments; /* init dest pointer */
-
- for(t=0;t<of.numins;t++){
-
- d->numsmp=1;
- if(!AllocSamples(d)) return 0;
-
- q=d->samples;
-
- /* convert the samplename */
-
- d->insname=DupStr(s->samplename,22);
-
- /* init the sampleinfo variables and
- convert the size pointers to longword format */
-
- q->c2spd=finetune[s->finetune&0xf];
- q->volume=s->volume;
- q->loopstart=s->reppos;
- q->loopend=q->loopstart+(s->replen<<1);
- q->length=s->length<<1;
- q->seekpos=0;
-
- q->flags=SF_SIGNED;
- if(s->replen>1) q->flags|=SF_LOOP;
-
- /* fix replen if repend>length */
-
- if(q->loopend>q->length) q->loopend=q->length;
-
- s++; /* point to next source sampleinfo */
- d++; /* point to next destiny sampleinfo */
- }
-
- if(!M15_LoadPatterns()) return 0;
- return 1;
- }
-
-
-
- LOADER load_m15={
- NULL,
- "15-instrument module",
- "Portable MOD-15 loader v0.1",
- M15_Init,
- M15_Test,
- M15_Load,
- M15_Cleanup
- };
-