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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2003 The ScummVM project
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "stdafx.h"
#include "sound/midiparser.h"
#include "sound/mididrv.h"
#include "common/util.h"
//////////////////////////////////////////////////
//
// The FM Towns Euphony version of MidiParser
//
//////////////////////////////////////////////////
class MidiParser_EUP : public MidiParser {
protected:
struct {
byte *enable;
int8 *channel;
int8 *volume;
int8 *transpose;
} _presets;
bool _loop;
byte _presend; // Tracks which startup implied events have been sent.
uint32 _base_tick; // Events times are relative to this base.
protected:
void parseNextEvent (EventInfo &info);
void resetTracking();
public:
bool loadMusic (byte *data, uint32 size);
};
//////////////////////////////////////////////////
//
// MidiParser_EUP implementation
//
//////////////////////////////////////////////////
void MidiParser_EUP::parseNextEvent (EventInfo &info) {
byte *pos = _position._play_pos;
// FIXME: The presend is for sending init events
// that aren't actually in the stream. This would
// be for, e.g., instrument setup. Right now, we
// don't actually use the instruments specified
// in the music header. We're sending fixed GM
// program changes to get a reasonable "one-size-
// fits-all" sound until we actually support the
// FM synthesis capabilities of FM Towns.
if (_presend) {
--_presend;
info.start = pos;
info.delta = 0;
info.event = ((_presend & 1) ? 0xB0 : 0xC0) | (_presend >> 1);
info.basic.param1 = ((_presend & 1) ? 7 : 0x38);
info.basic.param2 = ((_presend & 1) ? 127 : 0);
_presend = (_presend + 2) % 32;
return;
}
while (true) {
byte cmd = *pos;
if ((cmd & 0xF0) == 0x90) {
byte preset = pos[1];
byte channel = _presets.channel[preset];
if (channel >= 16)
channel = cmd & 0x0F;
uint16 tick = (pos[2] | ((uint16) pos[3] << 7)) + _base_tick;
int note = (int) pos[4] + _presets.transpose[preset];
int volume = (int) pos[5] + _presets.volume[preset];
pos += 6;
if (_presets.enable[preset]) {
uint16 duration = pos[1] | (pos[2] << 4);
info.start = pos;
uint32 last = _position._last_event_tick;
info.delta = (tick < last) ? 0 : (tick - last);
info.event = 0x90 | channel;
info.length = duration;
info.basic.param1 = note;
info.basic.param2 = volume;
pos += 6;
break;
}
pos += 6;
} else if (cmd == 0xF2) {
// This is a "measure marker" of sorts.
// It advances the "base time", to which
// all event times are relative.
_base_tick += (pos[3] << 7) | pos[2];
pos += 6;
} else if (cmd == 0xF8) {
// TODO: Implement this.
pos += 6;
} else if (cmd == 0xFD || cmd == 0xFE) {
// End of track.
if (_loop && false) {
// TODO: Implement this.
} else {
info.start = pos;
uint32 last = _position._last_event_tick;
info.delta = (_base_tick < last) ? 0 : (_base_tick - last);
info.event = 0xFF;
info.length = 0;
info.ext.type = 0x2F;
info.ext.data = pos;
pos += 6;
break;
}
} else {
printf ("Unknown Euphony music event 0x%02X\n", (int) cmd);
memset (&info, 0, sizeof(info));
pos = 0;
break;
}
}
_position._play_pos = pos;
}
bool MidiParser_EUP::loadMusic (byte *data, uint32 size) {
unloadMusic();
byte *pos = data;
if (memcmp (pos, "SO", 2)) {
printf ("Warning: 'SO' header expected but found '%c%c' instead.\n", pos[0], pos[1]);
return false;
}
byte numInstruments = pos[16];
pos += (16 + 2 + numInstruments * 48);
// Load the prest pointers
_presets.enable = pos;
pos += 32;
_presets.channel = (int8 *) pos;
pos += 32;
_presets.volume = (int8 *) pos;
pos += 32;
_presets.transpose = (int8 *) pos;
pos += 32;
pos += 8; // Unknown bytes
pos += 6; // Instrument-to-channel mapping (not supported yet)
pos += 4; // Skip the music size for now.
pos++; // Unknown byte
byte tempo = *pos++;
_loop = (*pos++ != 1);
pos++; // Unknown byte
_num_tracks = 1;
_ppqn = 120;
_tracks[0] = pos;
// Note that we assume the original data passed in
// will persist beyond this call, i.e. we do NOT
// copy the data to our own buffer. Take warning....
resetTracking();
setTempo (1000000 * 60 / tempo);
setTrack (0);
return true;
}
void MidiParser_EUP::resetTracking() {
MidiParser::resetTracking();
_presend = 1;
_base_tick = 0;
}
MidiParser *MidiParser_createEUP() { return new MidiParser_EUP; }
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