513 lines
12 KiB
C
513 lines
12 KiB
C
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/* 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_mod.c,v 1.3 2005/04/07 19:57:38 realtech Exp $
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Generic MOD loader (Protracker, StarTracker, FastTracker, etc)
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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 <ctype.h>
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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 MSAMPINFO {
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CHAR samplename[23]; /* 22 in module, 23 in memory */
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UWORD length;
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UBYTE finetune;
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UBYTE volume;
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UWORD reppos;
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UWORD replen;
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} MSAMPINFO;
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typedef struct MODULEHEADER {
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CHAR songname[21]; /* the songname.. 20 in module, 21 in memory */
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MSAMPINFO samples[31]; /* all sampleinfo */
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UBYTE songlength; /* number of patterns used */
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UBYTE magic1; /* should be 127 */
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UBYTE positions[128]; /* which pattern to play at pos */
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UBYTE magic2[4]; /* string "M.K." or "FLT4" or "FLT8" */
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} MODULEHEADER;
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typedef struct MODTYPE {
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CHAR id[5];
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UBYTE channels;
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CHAR *name;
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} MODTYPE;
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typedef struct MODNOTE {
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UBYTE a, b, c, d;
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} MODNOTE;
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/*========== Loader variables */
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#define MODULEHEADERSIZE 0x438
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static CHAR protracker[] = "Protracker";
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static CHAR startrekker[] = "Startrekker";
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static CHAR fasttracker[] = "Fasttracker";
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static CHAR oktalyser[] = "Oktalyser";
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static CHAR oktalyzer[] = "Oktalyzer";
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static CHAR taketracker[] = "TakeTracker";
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static CHAR orpheus[] = "Imago Orpheus (MOD format)";
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static MODULEHEADER *mh = NULL;
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static MODNOTE *patbuf = NULL;
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static int modtype, trekker;
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/*========== Loader code */
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/* given the module ID, determine the number of channels and the tracker
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description ; also alters modtype */
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static int MOD_CheckType(UBYTE *id, UBYTE *numchn, CHAR **descr)
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{
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modtype = trekker = 0;
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/* Protracker and variants */
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if ((!memcmp(id, "M.K.", 4)) || (!memcmp(id, "M!K!", 4))) {
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*descr = protracker;
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modtype = 0;
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*numchn = 4;
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return 1;
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}
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/* Star Tracker */
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if (((!memcmp(id, "FLT", 3)) || (!memcmp(id, "EXO", 3))) &&
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(isdigit(id[3]))) {
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*descr = startrekker;
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modtype = trekker = 1;
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*numchn = id[3] - '0';
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if (*numchn == 4 || *numchn == 8)
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return 1;
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#ifdef MIKMOD_DEBUG
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else
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fprintf(stderr, "\rUnknown FLT%d module type\n", *numchn);
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#endif
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return 0;
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}
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/* Oktalyzer (Amiga) */
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if (!memcmp(id, "OKTA", 4)) {
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*descr = oktalyzer;
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modtype = 1;
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*numchn = 8;
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return 1;
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}
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/* Oktalyser (Atari) */
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if (!memcmp(id, "CD81", 4)) {
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*descr = oktalyser;
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modtype = 1;
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*numchn = 8;
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return 1;
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}
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/* Fasttracker */
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if ((!memcmp(id + 1, "CHN", 3)) && (isdigit(id[0]))) {
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*descr = fasttracker;
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modtype = 1;
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*numchn = id[0] - '0';
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return 1;
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}
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/* Fasttracker or Taketracker */
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if (((!memcmp(id + 2, "CH", 2)) || (!memcmp(id + 2, "CN", 2)))
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&& (isdigit(id[0])) && (isdigit(id[1]))) {
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if (id[3] == 'H') {
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*descr = fasttracker;
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modtype = 2; /* this can also be Imago Orpheus */
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} else {
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*descr = taketracker;
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modtype = 1;
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}
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*numchn = (id[0] - '0') * 10 + (id[1] - '0');
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return 1;
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}
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return 0;
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}
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static int MOD_Test(void)
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{
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UBYTE id[4], numchn;
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CHAR *descr;
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_mm_fseek(modreader, MODULEHEADERSIZE, SEEK_SET);
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if (!_mm_read_UBYTES(id, 4, modreader))
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return 0;
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if (MOD_CheckType(id, &numchn, &descr))
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return 1;
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return 0;
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}
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static int MOD_Init(void)
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{
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if (!(mh = (MODULEHEADER *)MikMod_malloc(sizeof(MODULEHEADER))))
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return 0;
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return 1;
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}
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static void MOD_Cleanup(void)
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{
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MikMod_free(mh);
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MikMod_free(patbuf);
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}
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/*
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Old (amiga) noteinfo:
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_____byte 1_____ byte2_ _____byte 3_____ byte4_
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/ \ / \ / \ / \
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0000 0000-00000000 0000 0000-00000000
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Upper four 12 bits for Lower four Effect command.
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bits of sam- note period. bits of sam-
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ple number. ple number.
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*/
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static UBYTE ConvertNote(MODNOTE *n, UBYTE lasteffect)
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{
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UBYTE instrument, effect, effdat, note;
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UWORD period;
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UBYTE lastnote = 0;
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/* extract the various information from the 4 bytes that make up a note */
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instrument = (n->a & 0x10) | (n->c >> 4);
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period = (((UWORD)n->a & 0xf) << 8) + n->b;
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effect = n->c & 0xf;
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effdat = n->d;
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/* Convert the period to a note number */
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note = 0;
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if (period) {
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for (note = 0; note < 7 * OCTAVE; note++)
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if (period >= npertab[note])
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break;
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if (note == 7 * OCTAVE)
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note = 0;
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else
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note++;
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}
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if (instrument) {
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/* if instrument does not exist, note cut */
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if ((instrument > 31) || (!mh->samples[instrument - 1].length)) {
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UniPTEffect(0xc, 0);
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if (effect == 0xc)
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effect = effdat = 0;
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} else {
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/* Protracker handling */
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if (!modtype) {
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/* if we had a note, then change instrument... */
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if (note)
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UniInstrument(instrument - 1);
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/* ...otherwise, only adjust volume... */
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else {
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/* ...unless an effect was specified, which forces a new
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note to be played */
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if (effect || effdat) {
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UniInstrument(instrument - 1);
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note = lastnote;
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} else
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UniPTEffect(0xc,
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mh->samples[instrument -
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1].volume & 0x7f);
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}
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} else {
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/* Fasttracker handling */
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UniInstrument(instrument - 1);
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if (!note)
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note = lastnote;
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}
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}
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}
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if (note) {
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UniNote(note + 2 * OCTAVE - 1);
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lastnote = note;
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}
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/* Convert pattern jump from Dec to Hex */
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if (effect == 0xd)
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effdat = (((effdat & 0xf0) >> 4) * 10) + (effdat & 0xf);
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/* Volume slide, up has priority */
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if ((effect == 0xa) && (effdat & 0xf) && (effdat & 0xf0))
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effdat &= 0xf0;
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/* Handle ``heavy'' volumes correctly */
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if ((effect == 0xc) && (effdat > 0x40))
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effdat = 0x40;
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/* An isolated 100, 200 or 300 effect should be ignored (no
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"standalone" porta memory in mod files). However, a sequence such
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as 1XX, 100, 100, 100 is fine. */
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if ((!effdat) && ((effect == 1)||(effect == 2)||(effect ==3)) &&
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(lasteffect < 0x10) && (effect != lasteffect))
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effect = 0;
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UniPTEffect(effect, effdat);
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if (effect == 8)
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of.flags |= UF_PANNING;
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return effect;
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}
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static UBYTE *ConvertTrack(MODNOTE *n, int numchn)
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{
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int t;
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UBYTE lasteffect = 0x10; /* non existant effect */
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UniReset();
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for (t = 0; t < 64; t++) {
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lasteffect = ConvertNote(n,lasteffect);
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UniNewline();
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n += numchn;
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}
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return UniDup();
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}
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/* Loads all patterns of a modfile and converts them into the 3 byte format. */
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static int ML_LoadPatterns(void)
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{
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int t, s, tracks = 0;
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if (!AllocPatterns())
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return 0;
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if (!AllocTracks())
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return 0;
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/* Allocate temporary buffer for loading and converting the patterns */
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if (!(patbuf = (MODNOTE *)MikMod_calloc(64U * of.numchn, sizeof(MODNOTE))))
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return 0;
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if (trekker && of.numchn == 8) {
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/* Startrekker module dual pattern */
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for (t = 0; t < of.numpat; t++) {
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for (s = 0; s < (64U * 4); s++) {
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patbuf[s].a = _mm_read_UBYTE(modreader);
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patbuf[s].b = _mm_read_UBYTE(modreader);
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patbuf[s].c = _mm_read_UBYTE(modreader);
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patbuf[s].d = _mm_read_UBYTE(modreader);
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}
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for (s = 0; s < 4; s++)
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if (!(of.tracks[tracks++] = ConvertTrack(patbuf + s, 4)))
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return 0;
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for (s = 0; s < (64U * 4); s++) {
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patbuf[s].a = _mm_read_UBYTE(modreader);
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patbuf[s].b = _mm_read_UBYTE(modreader);
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patbuf[s].c = _mm_read_UBYTE(modreader);
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patbuf[s].d = _mm_read_UBYTE(modreader);
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}
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for (s = 0; s < 4; s++)
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if (!(of.tracks[tracks++] = ConvertTrack(patbuf + s, 4)))
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return 0;
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}
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} else {
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/* Generic module pattern */
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for (t = 0; t < of.numpat; t++) {
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/* Load the pattern into the temp buffer and convert it */
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for (s = 0; s < (64U * of.numchn); s++) {
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patbuf[s].a = _mm_read_UBYTE(modreader);
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patbuf[s].b = _mm_read_UBYTE(modreader);
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patbuf[s].c = _mm_read_UBYTE(modreader);
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patbuf[s].d = _mm_read_UBYTE(modreader);
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}
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for (s = 0; s < of.numchn; s++)
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if (!(of.tracks[tracks++] = ConvertTrack(patbuf + s, of.numchn)))
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return 0;
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}
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}
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return 1;
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}
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static int MOD_Load(int curious)
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{
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int t, scan;
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SAMPLE *q;
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MSAMPINFO *s;
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CHAR *descr;
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/* try to read module header */
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_mm_read_string((CHAR *)mh->songname, 20, modreader);
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mh->songname[20] = 0; /* just in case */
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for (t = 0; t < 31; t++) {
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s = &mh->samples[t];
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_mm_read_string(s->samplename, 22, modreader);
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s->samplename[22] = 0; /* just in case */
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s->length = _mm_read_M_UWORD(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->reppos = _mm_read_M_UWORD(modreader);
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s->replen = _mm_read_M_UWORD(modreader);
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||
|
|
}
|
||
|
|
|
||
|
|
mh->songlength = _mm_read_UBYTE(modreader);
|
||
|
|
|
||
|
|
/* this fixes mods which declare more than 128 positions.
|
||
|
|
* eg: beatwave.mod */
|
||
|
|
if (mh->songlength > 128) { mh->songlength = 128; }
|
||
|
|
|
||
|
|
mh->magic1 = _mm_read_UBYTE(modreader);
|
||
|
|
_mm_read_UBYTES(mh->positions, 128, modreader);
|
||
|
|
_mm_read_UBYTES(mh->magic2, 4, modreader);
|
||
|
|
|
||
|
|
if (_mm_eof(modreader)) {
|
||
|
|
_mm_errno = MMERR_LOADING_HEADER;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* set module variables */
|
||
|
|
of.initspeed = 6;
|
||
|
|
of.inittempo = 125;
|
||
|
|
if (!(MOD_CheckType(mh->magic2, &of.numchn, &descr))) {
|
||
|
|
_mm_errno = MMERR_NOT_A_MODULE;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (trekker && of.numchn == 8)
|
||
|
|
for (t = 0; t < 128; t++)
|
||
|
|
/* if module pretends to be FLT8, yet the order table
|
||
|
|
contains odd numbers, chances are it's a lying FLT4... */
|
||
|
|
if (mh->positions[t] & 1) {
|
||
|
|
of.numchn = 4;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (trekker && of.numchn == 8)
|
||
|
|
for (t = 0; t < 128; t++)
|
||
|
|
mh->positions[t] >>= 1;
|
||
|
|
|
||
|
|
of.songname = DupStr(mh->songname, 21, 1);
|
||
|
|
of.numpos = mh->songlength;
|
||
|
|
of.reppos = 0;
|
||
|
|
|
||
|
|
/* Count the number of patterns */
|
||
|
|
of.numpat = 0;
|
||
|
|
for (t = 0; t < of.numpos; t++)
|
||
|
|
if (mh->positions[t] > of.numpat)
|
||
|
|
of.numpat = mh->positions[t];
|
||
|
|
|
||
|
|
/* since some old modules embed extra patterns, we have to check the
|
||
|
|
whole list to get the samples' file offsets right - however we can find
|
||
|
|
garbage here, so check carefully */
|
||
|
|
scan = 1;
|
||
|
|
for (t = of.numpos; t < 128; t++)
|
||
|
|
if (mh->positions[t] >= 0x80)
|
||
|
|
scan = 0;
|
||
|
|
if (scan)
|
||
|
|
for (t = of.numpos; t < 128; t++) {
|
||
|
|
if (mh->positions[t] > of.numpat)
|
||
|
|
of.numpat = mh->positions[t];
|
||
|
|
if ((curious) && (mh->positions[t]))
|
||
|
|
of.numpos = t + 1;
|
||
|
|
}
|
||
|
|
of.numpat++;
|
||
|
|
of.numtrk = of.numpat * of.numchn;
|
||
|
|
|
||
|
|
if (!AllocPositions(of.numpos))
|
||
|
|
return 0;
|
||
|
|
for (t = 0; t < of.numpos; t++)
|
||
|
|
of.positions[t] = mh->positions[t];
|
||
|
|
|
||
|
|
/* Finally, init the sampleinfo structures */
|
||
|
|
of.numins = of.numsmp = 31;
|
||
|
|
if (!AllocSamples())
|
||
|
|
return 0;
|
||
|
|
s = mh->samples;
|
||
|
|
q = of.samples;
|
||
|
|
for (t = 0; t < of.numins; t++) {
|
||
|
|
/* convert the samplename */
|
||
|
|
q->samplename = DupStr(s->samplename, 23, 1);
|
||
|
|
/* init the sampleinfo variables and convert the size pointers */
|
||
|
|
q->speed = finetune[s->finetune & 0xf];
|
||
|
|
q->volume = s->volume & 0x7f;
|
||
|
|
q->loopstart = (ULONG)s->reppos << 1;
|
||
|
|
q->loopend = q->loopstart + ((ULONG)s->replen << 1);
|
||
|
|
q->length = (ULONG)s->length << 1;
|
||
|
|
q->flags = SF_SIGNED;
|
||
|
|
/* Imago Orpheus creates MODs with 16 bit samples, check */
|
||
|
|
if ((modtype == 2) && (s->volume & 0x80)) {
|
||
|
|
q->flags |= SF_16BITS;
|
||
|
|
descr = orpheus;
|
||
|
|
}
|
||
|
|
if (s->replen > 2)
|
||
|
|
q->flags |= SF_LOOP;
|
||
|
|
|
||
|
|
s++;
|
||
|
|
q++;
|
||
|
|
}
|
||
|
|
|
||
|
|
of.modtype = StrDup(descr);
|
||
|
|
|
||
|
|
if (!ML_LoadPatterns())
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
static CHAR *MOD_LoadTitle(void)
|
||
|
|
{
|
||
|
|
CHAR s[21];
|
||
|
|
|
||
|
|
_mm_fseek(modreader, 0, SEEK_SET);
|
||
|
|
if (!_mm_read_UBYTES(s, 20, modreader))
|
||
|
|
return NULL;
|
||
|
|
s[20] = 0; /* just in case */
|
||
|
|
|
||
|
|
return (DupStr(s, 21, 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
/*========== Loader information */
|
||
|
|
|
||
|
|
MIKMODAPI MLOADER load_mod = {
|
||
|
|
NULL,
|
||
|
|
"Standard module",
|
||
|
|
"MOD (31 instruments)",
|
||
|
|
MOD_Init,
|
||
|
|
MOD_Test,
|
||
|
|
MOD_Load,
|
||
|
|
MOD_Cleanup,
|
||
|
|
MOD_LoadTitle
|
||
|
|
};
|
||
|
|
|
||
|
|
/* ex:set ts=4: */
|