461 lines
10 KiB
C
461 lines
10 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_okt.c,v 1.3 2005/04/07 19:57:38 realtech Exp $
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Oktalyzer (OKT) module loader
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==============================================================================*/
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/*
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Written by UFO <ufo303@poczta.onet.pl>
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based on the file description compiled by Harald Zappe
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<zappe@gaea.sietec.de>
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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 blocks */
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/* sample information */
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typedef struct OKTSAMPLE {
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CHAR sampname[20];
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ULONG len;
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UWORD loopbeg;
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UWORD looplen;
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UBYTE volume;
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} OKTSAMPLE;
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typedef struct OKTNOTE {
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UBYTE note, ins, eff, dat;
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} OKTNOTE;
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/*========== Loader variables */
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static OKTNOTE *okttrk = NULL;
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/*========== Loader code */
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static int OKT_Test(void)
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{
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CHAR id[8];
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if (!_mm_read_UBYTES(id, 8, modreader))
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return 0;
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if (!memcmp(id, "OKTASONG", 8))
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return 1;
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return 0;
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}
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/* Pattern analysis routine.
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Effects not implemented (yet) : (in decimal)
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11 Arpeggio 4: Change note every 50Hz tick between N,H,N,L
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12 Arpeggio 5: Change note every 50Hz tick between H,H,N
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N = normal note being played in this channel (1-36)
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L = normal note number minus upper four bits of 'data'.
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H = normal note number plus lower four bits of 'data'.
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13 Decrease note number by 'data' once per tick.
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17 Increase note number by 'data' once per tick.
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21 Decrease note number by 'data' once per line.
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30 Increase note number by 'data' once per line.
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*/
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static UBYTE *OKT_ConvertTrack(UBYTE patrows)
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{
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int t;
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UBYTE ins, note, eff, dat;
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UniReset();
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for (t = 0; t < patrows; t++) {
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note = okttrk[t].note;
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ins = okttrk[t].ins;
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eff = okttrk[t].eff;
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dat = okttrk[t].dat;
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if (note) {
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UniNote(note + 3 * OCTAVE - 1);
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UniInstrument(ins);
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}
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if (eff)
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switch (eff) {
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case 1: /* Porta Up */
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UniPTEffect(0x1, dat);
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break;
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case 2: /* Portamento Down */
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UniPTEffect(0x2, dat);
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break;
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/* case 9: what is this? */
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case 10: /* Arpeggio 3 */
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case 11: /* Arpeggio 4 */
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case 12: /* Arpeggio 5 */
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UniWriteByte(UNI_OKTARP);
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UniWriteByte(eff + 3 - 10);
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UniWriteByte(dat);
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break;
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case 15: /* Amiga filter toggle, ignored */
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break;
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case 25: /* Pattern Jump */
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dat = (dat >> 4) * 10 + (dat & 0x0f);
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UniPTEffect(0xb, dat);
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break;
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case 27: /* Release - similar to Keyoff */
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UniWriteByte(UNI_KEYOFF);
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break;
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case 28: /* Set Tempo */
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UniPTEffect(0xf, dat & 0x0f);
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break;
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case 31: /* volume Control */
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if (dat <= 0x40)
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UniPTEffect(0xc, dat);
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else if (dat <= 0x50)
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UniEffect(UNI_XMEFFECTA, (dat - 0x40)); /* fast fade out */
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else if (dat <= 0x60)
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UniEffect(UNI_XMEFFECTA, (dat - 0x50) << 4); /* fast fade in */
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else if (dat <= 0x70)
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UniEffect(UNI_XMEFFECTEB, (dat - 0x60)); /* slow fade out */
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else if (dat <= 0x80)
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UniEffect(UNI_XMEFFECTEA, (dat - 0x70)); /* slow fade in */
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break;
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#ifdef MIKMOD_DEBUG
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default:
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fprintf(stderr, "\rUnimplemented effect (%02d,%02x)\n",
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eff, dat);
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#endif
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}
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UniNewline();
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}
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return UniDup();
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}
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/* Read "channel modes" i.e. channel number and panning information */
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static void OKT_doCMOD(void)
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{
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/* amiga channel panning table */
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UBYTE amigapan[4] = { 0x00, 0xff, 0xff, 0x00 };
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int t;
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of.numchn = 0;
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of.flags |= UF_PANNING;
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for (t = 0; t < 4; t++)
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if (_mm_read_M_UWORD(modreader)) {
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/* two channels tied to the same Amiga hardware voice */
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of.panning[of.numchn++] = amigapan[t];
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of.panning[of.numchn++] = amigapan[t];
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} else
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/* one channel tied to the Amiga hardware voice */
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of.panning[of.numchn++] = amigapan[t];
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}
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/* Read sample information */
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static int OKT_doSAMP(int len)
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{
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int t;
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SAMPLE *q;
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OKTSAMPLE s;
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of.numins = of.numsmp = (len / 0x20);
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if (!AllocSamples())
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return 0;
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for (t = 0, q = of.samples; t < of.numins; t++, q++) {
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_mm_read_UBYTES(s.sampname, 20, modreader);
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s.len = _mm_read_M_ULONG(modreader);
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s.loopbeg = _mm_read_M_UWORD(modreader) * 2;
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s.looplen = _mm_read_M_UWORD(modreader) * 2;
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(void)_mm_read_UBYTE(modreader);
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s.volume = _mm_read_UBYTE(modreader);
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_mm_read_M_UWORD(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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if (!s.len)
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q->seekpos = q->length = q->loopstart = q->loopend = q->flags = 0;
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else {
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s.len--;
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/* sanity checks */
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if (s.loopbeg > s.len)
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s.loopbeg = s.len;
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if (s.loopbeg + s.looplen > s.len)
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s.looplen = s.len - s.loopbeg;
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if (s.looplen < 2)
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s.looplen = 0;
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q->length = s.len;
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q->loopstart = s.loopbeg;
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q->loopend = s.looplen + q->loopstart;
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q->volume = s.volume;
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q->flags = SF_SIGNED;
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if (s.looplen)
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q->flags |= SF_LOOP;
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}
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q->samplename = DupStr(s.sampname, 20, 1);
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q->speed = 8287;
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}
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return 1;
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}
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/* Read speed information */
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static void OKT_doSPEE(void)
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{
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int tempo = _mm_read_M_UWORD(modreader);
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of.initspeed = tempo;
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}
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/* Read song length information */
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static void OKT_doSLEN(void)
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{
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of.numpat = _mm_read_M_UWORD(modreader);
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}
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/* Read pattern length information */
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static void OKT_doPLEN(void)
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{
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of.numpos = _mm_read_M_UWORD(modreader);
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}
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/* Read order table */
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static int OKT_doPATT(void)
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{
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int t;
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if (!of.numpos || !AllocPositions(of.numpos))
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return 0;
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for (t = 0; t < 128; t++)
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if (t < of.numpos)
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of.positions[t] = _mm_read_UBYTE(modreader);
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else
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break;
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return 1;
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}
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static int OKT_doPBOD(int patnum)
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{
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char *patbuf;
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int rows, i;
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int u;
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if (!patnum) {
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of.numtrk = of.numpat * of.numchn;
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if (!AllocTracks() || !AllocPatterns())
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return 0;
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}
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/* Read pattern */
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of.pattrows[patnum] = rows = _mm_read_M_UWORD(modreader);
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if (!(okttrk = (OKTNOTE *) MikMod_calloc(rows, sizeof(OKTNOTE))) ||
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!(patbuf = (char *)MikMod_calloc(rows * of.numchn, sizeof(OKTNOTE))))
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return 0;
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_mm_read_UBYTES(patbuf, rows * of.numchn * sizeof(OKTNOTE), modreader);
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if (_mm_eof(modreader)) {
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_mm_errno = MMERR_LOADING_PATTERN;
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return 0;
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}
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for (i = 0; i < of.numchn; i++) {
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for (u = 0; u < rows; u++) {
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okttrk[u].note = patbuf[(u * of.numchn + i) * sizeof(OKTNOTE)];
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okttrk[u].ins = patbuf[(u * of.numchn + i) * sizeof(OKTNOTE) + 1];
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okttrk[u].eff = patbuf[(u * of.numchn + i) * sizeof(OKTNOTE) + 2];
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okttrk[u].dat = patbuf[(u * of.numchn + i) * sizeof(OKTNOTE) + 3];
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}
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if (!(of.tracks[patnum * of.numchn + i] = OKT_ConvertTrack(rows)))
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return 0;
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}
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MikMod_free(patbuf);
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MikMod_free(okttrk);
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return 1;
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}
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static void OKT_doSBOD(int insnum)
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{
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of.samples[insnum].seekpos = _mm_ftell(modreader);
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}
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static int OKT_Load(int curious)
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{
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UBYTE id[4];
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ULONG len;
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ULONG fp;
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int seen_cmod = 0, seen_samp = 0, seen_slen = 0, seen_plen = 0, seen_patt
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= 0, seen_spee = 0;
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int patnum = 0, insnum = 0;
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(void)curious;
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/* skip OKTALYZER header */
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_mm_fseek(modreader, 8, SEEK_SET);
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of.songname = StrDup("");
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of.modtype = StrDup("Amiga Oktalyzer");
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of.numpos = of.reppos = 0;
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/* default values */
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of.initspeed = 6;
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of.inittempo = 125;
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while (1) {
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/* read block header */
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_mm_read_UBYTES(id, 4, modreader);
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len = _mm_read_M_ULONG(modreader);
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if (_mm_eof(modreader))
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break;
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fp = _mm_ftell(modreader);
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if (!memcmp(id, "CMOD", 4)) {
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if (!seen_cmod) {
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OKT_doCMOD();
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seen_cmod = 1;
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} else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id, "SAMP", 4)) {
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if (!seen_samp && OKT_doSAMP(len))
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seen_samp = 1;
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else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id, "SPEE", 4)) {
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if (!seen_spee) {
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OKT_doSPEE();
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seen_spee = 1;
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} else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id, "SLEN", 4)) {
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if (!seen_slen) {
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OKT_doSLEN();
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seen_slen = 1;
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} else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id, "PLEN", 4)) {
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if (!seen_plen) {
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OKT_doPLEN();
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seen_plen = 1;
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} else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id, "PATT", 4)) {
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if (!seen_plen) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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if (!seen_patt && OKT_doPATT())
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seen_patt = 1;
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else {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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} else if (!memcmp(id,"PBOD", 4)) {
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/* need to know numpat and numchn */
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if (!seen_slen || !seen_cmod || (patnum >= of.numpat)) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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if (!OKT_doPBOD(patnum++)) {
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_mm_errno = MMERR_LOADING_PATTERN;
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return 0;
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}
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} else if (!memcmp(id,"SBOD",4)) {
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/* need to know numsmp */
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if (!seen_samp) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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while ((insnum < of.numins) && !of.samples[insnum].length)
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insnum++;
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if (insnum >= of.numins) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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OKT_doSBOD(insnum++);
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}
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/* goto next block start position */
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_mm_fseek(modreader, fp + len, SEEK_SET);
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}
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if (!seen_cmod || !seen_samp || !seen_patt ||
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!seen_slen || !seen_plen || (patnum != of.numpat)) {
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_mm_errno = MMERR_LOADING_HEADER;
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return 0;
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}
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return 1;
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}
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static CHAR *OKT_LoadTitle(void)
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{
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return StrDup("");
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}
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/*========== Loader information */
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MIKMODAPI MLOADER load_okt = {
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NULL,
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"OKT",
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"OKT (Amiga Oktalyzer)",
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NULL,
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OKT_Test,
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OKT_Load,
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NULL,
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OKT_LoadTitle
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};
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/* ex:set ts=4: */
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