aboutsummaryrefslogtreecommitdiff
path: root/engines/groovie/music.cpp
blob: 011409155cc78eaff1907fd4dce6bf6bc514332a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#include "groovie/music.h"
#include "groovie/groovie.h"
#include "groovie/resource.h"

#include "backends/audiocd/audiocd.h"
#include "common/config-manager.h"
#include "common/macresman.h"
#include "common/memstream.h"
#include "audio/midiparser.h"

namespace Groovie {

// MusicPlayer

MusicPlayer::MusicPlayer(GroovieEngine *vm) :
	_vm(vm), _isPlaying(false), _backgroundFileRef(0), _gameVolume(100),
	_prevCDtrack(0), _backgroundDelay(0) {
}

MusicPlayer::~MusicPlayer() {
	g_system->getAudioCDManager()->stop();
}

void MusicPlayer::playSong(uint32 fileref) {
	Common::StackLock lock(_mutex);

	// Set the volumes
	_fadingEndVolume = 100;
	_gameVolume = 100;

	// Play the referenced file once
	play(fileref, false);
}

void MusicPlayer::setBackgroundSong(uint32 fileref) {
	Common::StackLock lock(_mutex);

	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Changing the background song: %04X", fileref);
	_backgroundFileRef = fileref;
}

void MusicPlayer::frameTick() {
	if (_backgroundDelay > 0) {
		_backgroundDelay--;
		if (_backgroundDelay == 0)
			playSong(_backgroundFileRef);
	}
}

void MusicPlayer::setBackgroundDelay(uint16 delay) {
	_backgroundDelay = delay;
}

void MusicPlayer::playCD(uint8 track) {
	int startms = 0;

	// Stop the MIDI playback
	unload();

	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Playing CD track %d", track);

	if (track == 3) {
		// This is the credits song, start at 23:20
		startms = 1400000;
		// TODO: If we want to play it directly from the CD, we should decrement
		// the song number (it's track 2 on the 2nd CD)
	} else if ((track == 98) && (_prevCDtrack == 3)) {
		// Track 98 is used as a hack to stop the credits song
		g_system->getAudioCDManager()->stop();
		return;
	}

	// Save the playing track in order to be able to stop the credits song
	_prevCDtrack = track;

	// Wait until the CD stops playing the current song
	// It was in the original interpreter, but it introduces a big delay
	// in the middle of the introduction, so it's disabled right now
	/*
	g_system->getAudioCDManager()->updateCD();
	while (g_system->getAudioCDManager()->isPlaying()) {
		// Wait a bit and try again
		_vm->_system->delayMillis(100);
		g_system->getAudioCDManager()->updateCD();
	}
	*/

	// Play the track starting at the requested offset (1000ms = 75 frames)
	g_system->getAudioCDManager()->play(track - 1, 1, startms * 75 / 1000, 0);

	// If the audio is not playing from the CD, play the "fallback" MIDI.
	// The Mac version has no CD tracks, so it will always use the MIDI.
	if (!g_system->getAudioCDManager()->isPlaying()) {
		if (track == 2) {
			// Intro MIDI fallback
			if (_vm->getPlatform() == Common::kPlatformMacintosh)
				playSong(70);
			else
				playSong((19 << 10) | 36); // XMI.GJD, file 36
		} else if (track == 3) {
			// TODO: Credits MIDI fallback
		}
	}
}

void MusicPlayer::startBackground() {
	debugC(3, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: startBackground()");
	if (!_isPlaying && _backgroundFileRef) {
		debugC(3, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Starting the background song (0x%4X)", _backgroundFileRef);
		play(_backgroundFileRef, true);
	}
}

void MusicPlayer::setUserVolume(uint16 volume) {
	Common::StackLock lock(_mutex);

	// Save the new user volume
	_userVolume = volume;
	if (_userVolume > 0x100)
		_userVolume = 0x100;

	// Apply it
	updateVolume();
}

void MusicPlayer::setGameVolume(uint16 volume, uint16 time) {
	Common::StackLock lock(_mutex);

	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Setting game volume from %d to %d in %dms", _gameVolume, volume, time);

	// Save the start parameters of the fade
	_fadingStartTime = _vm->_system->getMillis();
	_fadingStartVolume = _gameVolume;
	_fadingDuration = time;

	// Save the new game volume
	_fadingEndVolume = volume;
	if (_fadingEndVolume > 100)
		_fadingEndVolume = 100;
}

bool MusicPlayer::play(uint32 fileref, bool loop) {
	// Unload the previous song
	unload();

	// Set the new state
	_isPlaying = true;

	// Load the new file
	return load(fileref, loop);
}

void MusicPlayer::applyFading() {
	debugC(6, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: applyFading() _fadingStartTime = %d, _fadingDuration = %d, _fadingStartVolume = %d, _fadingEndVolume = %d", _fadingStartTime, _fadingDuration, _fadingStartVolume, _fadingEndVolume);
	Common::StackLock lock(_mutex);

	// Calculate the passed time
	uint32 time = _vm->_system->getMillis() - _fadingStartTime;
	debugC(6, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: time = %d, _gameVolume = %d", time, _gameVolume);
	if (time >= _fadingDuration) {
		// Set the end volume
		_gameVolume = _fadingEndVolume;
	} else {
		// Calculate the interpolated volume for the current time
		_gameVolume = (_fadingStartVolume * (_fadingDuration - time) +
			_fadingEndVolume * time) / _fadingDuration;
	}
	if (_gameVolume == _fadingEndVolume) {
		// If we were fading to 0, stop the playback and restore the volume
		if (_fadingEndVolume == 0) {
			debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Faded to zero: end of song. _fadingEndVolume set to 100");
			unload();
		}
	}

	// Apply it
	updateVolume();
}

void MusicPlayer::onTimer(void *refCon) {
	debugC(9, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: onTimer()");
	MusicPlayer *music = (MusicPlayer *)refCon;
	Common::StackLock lock(music->_mutex);

	// Apply the game volume fading
	if (music->_gameVolume != music->_fadingEndVolume) {
		// Apply the next step of the fading
		music->applyFading();
	}

	// Handle internal timed events
	music->onTimerInternal();
}

void MusicPlayer::unload() {
	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Stopping the playback");

	// Set the new state
	_isPlaying = false;
}


// MusicPlayerMidi

MusicPlayerMidi::MusicPlayerMidi(GroovieEngine *vm) :
	MusicPlayer(vm), _midiParser(NULL), _data(NULL), _driver(NULL) {
	// Initialize the channel volumes
	for (int i = 0; i < 0x10; i++) {
		_chanVolumes[i] = 0x7F;
	}
}

MusicPlayerMidi::~MusicPlayerMidi() {
	// Stop the callback
	if (_driver)
		_driver->setTimerCallback(NULL, NULL);

	Common::StackLock lock(_mutex);

	// Unload the parser
	unload();
	delete _midiParser;

	// Unload the MIDI Driver
	if (_driver)
		_driver->close();
	delete _driver;
}

int MusicPlayerMidi::open() {
	// Don't ever call open without first setting the output driver!
	if (!_driver)
		return 255;

	int ret = _driver->open();
	if (ret)
		return ret;

	return 0;
}

void MusicPlayerMidi::close() {}

void MusicPlayerMidi::send(uint32 b) {
	if ((b & 0xFFF0) == 0x07B0) { // Volume change
		// Save the specific channel volume
		byte chan = b & 0xF;
		_chanVolumes[chan] = (b >> 16) & 0x7F;

		// Send the updated value
		updateChanVolume(chan);

		return;
	}
	if (_driver)
		_driver->send(b);
}

void MusicPlayerMidi::metaEvent(byte type, byte *data, uint16 length) {
	switch (type) {
	case 0x2F:
		// End of Track, play the background song
		endTrack();
		break;
	default:
		if (_driver)
			_driver->metaEvent(type, data, length);
		break;
	}
}

void MusicPlayerMidi::setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc) {
	if (_driver)
		_driver->setTimerCallback(timer_param, timer_proc);
}

uint32 MusicPlayerMidi::getBaseTempo() {
	if (_driver)
		return _driver->getBaseTempo();
	else
		return 0;
}

MidiChannel *MusicPlayerMidi::allocateChannel() {
	if (_driver)
		return _driver->allocateChannel();
	else
		return 0;
}

MidiChannel *MusicPlayerMidi::getPercussionChannel() {
	if (_driver)
		return _driver->getPercussionChannel();
	else
		return 0;
}

void MusicPlayerMidi::updateChanVolume(byte channel) {
	// Generate a MIDI Control change message for the volume
	uint32 b = 0x7B0;

	// Specify the channel
	b |= (channel & 0xF);

	// Scale by the user and game volumes
	uint32 val = (_chanVolumes[channel] * _userVolume * _gameVolume) / 0x100 / 100;
	val &= 0x7F;

	// Send it to the driver
	if (_driver)
		_driver->send(b | (val << 16));
}

void MusicPlayerMidi::endTrack() {
	debugC(3, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: endTrack()");
	unload();
}

void MusicPlayerMidi::onTimerInternal() {
	// TODO: We really only need to call this while music is playing.
	if (_midiParser)
		_midiParser->onTimer();
}

void MusicPlayerMidi::updateVolume() {
	// Apply it to all the channels
	for (int i = 0; i < 0x10; i++) {
		updateChanVolume(i);
	}
}

void MusicPlayerMidi::unload() {
	MusicPlayer::unload();

	// Unload the parser data
	if (_midiParser)
		_midiParser->unloadMusic();

	// Unload the data
	delete[] _data;
	_data = NULL;
}

bool MusicPlayerMidi::loadParser(Common::SeekableReadStream *stream, bool loop) {
	if (!_midiParser)
		return false;

	// Read the whole file to memory
	int length = stream->size();
	_data = new byte[length];
	stream->read(_data, length);
	delete stream;

	// Set the looping option
	_midiParser->property(MidiParser::mpAutoLoop, loop);

	// Start parsing the data
	if (!_midiParser->loadMusic(_data, length)) {
		error("Groovie::Music: Couldn't parse the data");
		return false;
	}

	// Activate the timer source
	if (_driver)
		_driver->setTimerCallback(this, &onTimer);

	return true;
}


// MusicPlayerXMI

MusicPlayerXMI::MusicPlayerXMI(GroovieEngine *vm, const Common::String &gtlName) :
	MusicPlayerMidi(vm) {
	// Create the parser
	_midiParser = MidiParser::createParser_XMIDI();

	// Create the driver
	MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB | MDT_PREFER_GM);
	_driver = createMidi(dev);
	this->open();

	// Set the parser's driver
	_midiParser->setMidiDriver(this);

	// Set the timer rate
	_midiParser->setTimerRate(_driver->getBaseTempo());

	// Initialize the channel banks
	for (int i = 0; i < 0x10; i++) {
		_chanBanks[i] = 0;
	}

	// Load the Global Timbre Library
	if (MidiDriver::getMusicType(dev) == MT_ADLIB) {
		// MIDI through AdLib
		_musicType = MT_ADLIB;
		loadTimbres(gtlName + ".ad");

		// Setup the percussion channel
		for (uint i = 0; i < _timbres.size(); i++) {
			if (_timbres[i].bank == 0x7F)
				setTimbreAD(9, _timbres[i]);
		}
	} else if ((MidiDriver::getMusicType(dev) == MT_MT32) || ConfMan.getBool("native_mt32")) {
		_driver->sendMT32Reset();

		// MT-32
		_musicType = MT_MT32;
		loadTimbres(gtlName + ".mt");
	} else {
		_driver->sendGMReset();

		// GM
		_musicType = 0;
	}
}

MusicPlayerXMI::~MusicPlayerXMI() {
	//~MusicPlayer();

	// Unload the timbres
	clearTimbres();
}

void MusicPlayerXMI::send(uint32 b) {
	if ((b & 0xFFF0) == 0x72B0) { // XMIDI Patch Bank Select 114
		// From AIL2's documentation: XMIDI Patch Bank Select controller (114)
		// selects a bank to be used when searching the next patches
		byte chan = b & 0xF;
		byte bank = (b >> 16) & 0xFF;

		debugC(5, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Selecting bank %X for channel %X", bank, chan);
		_chanBanks[chan] = bank;
		return;
	} else if ((b & 0xF0) == 0xC0) { // Program change
		// We intercept the program change when using AdLib or MT32 drivers,
		// since we have custom timbres for them.  The command is sent
		// unchanged to GM drivers.
		if (_musicType != 0) {
			byte chan = b & 0xF;
			byte patch = (b >> 8) & 0xFF;

			debugC(5, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Setting custom patch %X from bank %X to channel %X", patch, _chanBanks[chan], chan);

			// Try to find the requested patch from the previously
			// specified bank
			int numTimbres = _timbres.size();
			for (int i = 0; i < numTimbres; i++) {
				if ((_timbres[i].bank == _chanBanks[chan]) &&
					(_timbres[i].patch == patch)) {
					if (_musicType == MT_ADLIB) {
						setTimbreAD(chan, _timbres[i]);
					} else if (_musicType == MT_MT32) {
						setTimbreMT(chan, _timbres[i]);
					}
					return;
				}
			}

			// If we got here we couldn't find the patch, and the
			// received message will be sent unchanged.
		}
	}
	MusicPlayerMidi::send(b);
}

bool MusicPlayerXMI::load(uint32 fileref, bool loop) {
	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Starting the playback of song: %04X", fileref);

	// Open the song resource
	Common::SeekableReadStream *file = _vm->_resMan->open(fileref);
	if (!file) {
		error("Groovie::Music: Couldn't find resource 0x%04X", fileref);
		return false;
	}

	return loadParser(file, loop);
}

void MusicPlayerXMI::loadTimbres(const Common::String &filename) {
	// Load the Global Timbre Library format as documented in AIL2
	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Loading the GTL file %s", filename.c_str());

	// Does it exist?
	if (!Common::File::exists(filename)) {
		error("Groovie::Music: %s not found", filename.c_str());
		return;
	}

	// Open the GTL
	Common::File *gtl = new Common::File();
	if (!gtl->open(filename.c_str())) {
		delete gtl;
		error("Groovie::Music: Couldn't open %s", filename.c_str());
		return;
	}

	// Clear the old timbres before loading the new ones
	clearTimbres();

	// Get the list of timbres
	while (true) {
		Timbre t;
		t.patch = gtl->readByte();
		t.bank = gtl->readByte();
		if ((t.patch == 0xFF) && (t.bank == 0xFF)) {
			// End of list
			break;
		}
		// We temporarily use the size field to store the offset
		t.size = gtl->readUint32LE();

		// Add it to the list
		_timbres.push_back(t);
	}

	// Read the timbres
	for (unsigned int i = 0; i < _timbres.size(); i++) {
		// Seek to the start of the timbre
		gtl->seek(_timbres[i].size);

		// Read the size
		_timbres[i].size = gtl->readUint16LE() - 2;

		// Allocate memory for the timbre data
		_timbres[i].data = new byte[_timbres[i].size];

		// Read the timbre data
		gtl->read(_timbres[i].data, _timbres[i].size);
		debugC(5, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Loaded patch %x in bank %x with size %d",
			_timbres[i].patch, _timbres[i].bank, _timbres[i].size);
	}

	// Close the file
	delete gtl;
}

void MusicPlayerXMI::clearTimbres() {
	// Delete the allocated data
	int num = _timbres.size();
	for (int i = 0; i < num; i++) {
		delete[] _timbres[i].data;
	}

	// Erase the array entries
	_timbres.clear();
}

void MusicPlayerXMI::setTimbreAD(byte channel, const Timbre &timbre) {
	// Verify the timbre size
	if (timbre.size != 12) {
		error("Groovie::Music: Invalid size for an AdLib timbre: %d", timbre.size);
	}

	// Prepare the AdLib Instrument array from the GTL entry
	//
	// struct AdLibInstrument used by our AdLib MIDI synth is 30 bytes.
	// Since we pass data + 2 for non percussion instruments we need to
	// have a buffer of size 32, so there are no invalid memory reads,
	// when setting up an AdLib instrument.
	byte data[32];
	memset(data, 0, sizeof(data));

	data[2] = timbre.data[1];        // mod_characteristic
	data[3] = timbre.data[2] ^ 0x3F; // mod_scalingOutputLevel
	data[4] = ~timbre.data[3];       // mod_attackDecay
	data[5] = ~timbre.data[4];       // mod_sustainRelease
	data[6] = timbre.data[5];        // mod_waveformSelect
	data[7] = timbre.data[7];        // car_characteristic
	data[8] = timbre.data[8] ^ 0x3F; // car_scalingOutputLevel
	data[9] = ~timbre.data[9];       // car_attackDecay
	data[10] = ~timbre.data[10];     // car_sustainRelease
	data[11] = timbre.data[11];      // car_waveformSelect
	data[12] = timbre.data[6];       // feedback

	// Send the instrument to the driver
	if (timbre.bank == 0x7F) {
		// This is a Percussion instrument, this will always be set on the same note
		data[0] = timbre.patch;

		// From AIL2's documentation: If the instrument is to be played in MIDI
		// channel 10, num specifies its desired absolute MIDI note number.
		data[1] = timbre.data[0];

		_driver->getPercussionChannel()->sysEx_customInstrument('ADLP', data);
	} else {
		// Some tweaks for non-percussion instruments
		byte mult1 = timbre.data[1] & 0xF;
		if (mult1 < 4)
			mult1 = 1 << mult1;
		data[2] = (timbre.data[1] & 0xF0) + (mult1 & 0xF);
		byte mult2 = timbre.data[7] & 0xF;
		if (mult2 < 4)
			mult2 = 1 << mult2;
		data[7] = (timbre.data[7] & 0xF0) + (mult2 & 0xF);
		// TODO: Fix CHARACTERISTIC: 0xF0: pitch_vib, amp_vib, sustain_sound, env_scaling  0xF: freq_mult
		// TODO: Fix KSL_TL: 0xC: key_scale_lvl  0x3F: out_lvl

		// From AIL2's documentation: num specifies the number of semitones
		// by which to transpose notes played with the instrument.
		if (timbre.data[0] != 0)
			warning("Groovie::Music: AdLib instrument's transposing not supported");

		_driver->sysEx_customInstrument(channel, 'ADL ', data + 2);
	}
}


#include "common/pack-start.h"	// START STRUCT PACKING

struct RolandInstrumentSysex {
	byte roland_id;
	byte device_id;
	byte model_id;
	byte command;
	byte address[3];
	byte instrument[0xF6];
	byte checksum;
} PACKED_STRUCT;

#include "common/pack-end.h"	// END STRUCT PACKING

void setRolandInstrument(MidiDriver *drv, byte channel, byte *instrument) {
	RolandInstrumentSysex sysex;
	memcpy(&sysex.instrument, instrument, 0xF6);

	// Show the timbre name as extra debug information
	Common::String name((char *)instrument, 10);
	debugC(5, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Setting MT32 timbre '%s' to channel %d", name.c_str(), channel);

	sysex.roland_id = 0x41;
	sysex.device_id = channel; // Unit#
	sysex.model_id = 0x16; // MT32
	sysex.command = 0x12; // Data set

	// Remap instrument to appropriate address space.
	int address = 0x008000;
	sysex.address[0] = (address >> 14) & 0x7F;
	sysex.address[1] = (address >>  7) & 0x7F;
	sysex.address[2] = (address      ) & 0x7F;

	// Compute the checksum.
	byte checksum = 0;
	byte *ptr = sysex.address;
	for (int i = 4; i < (int)sizeof(RolandInstrumentSysex) - 1; ++i)
		checksum -= *ptr++;
	sysex.checksum = checksum & 0x7F;

	// Send sysex
	drv->sysEx((byte *)&sysex, sizeof(RolandInstrumentSysex));


	// Wait the time it takes to send the SysEx data
	uint32 delay = (sizeof(RolandInstrumentSysex) + 2) * 1000 / 3125;

	// Plus an additional delay for the MT-32 rev00
	delay += 40;

	g_system->delayMillis(delay);
}

void MusicPlayerXMI::setTimbreMT(byte channel, const Timbre &timbre) {
	// Verify the timbre size
	if (timbre.size != 0xF6)
		error("Groovie::Music: Invalid size for an MT-32 timbre: %d", timbre.size);

	setRolandInstrument(_driver, channel, timbre.data);
}


// MusicPlayerMac

MusicPlayerMac::MusicPlayerMac(GroovieEngine *vm) : MusicPlayerMidi(vm) {
	// Create the parser
	_midiParser = MidiParser::createParser_SMF();

	// Create the driver
	MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB | MDT_PREFER_GM);
	_driver = createMidi(dev);
	this->open();

	// Set the parser's driver
	_midiParser->setMidiDriver(this);

	// Set the timer rate
	_midiParser->setTimerRate(_driver->getBaseTempo());

	// Sanity check
	assert(_vm->_macResFork);
}

bool MusicPlayerMac::load(uint32 fileref, bool loop) {
	debugC(1, kGroovieDebugMIDI | kGroovieDebugAll, "Groovie::Music: Starting the playback of song: %04X", fileref);

	// First try for compressed MIDI
	Common::SeekableReadStream *file = _vm->_macResFork->getResource(MKID_BE('cmid'), fileref & 0x3FF);

	if (file) {
		// Found the resource, decompress it
		Common::SeekableReadStream *tmp = decompressMidi(file);
		delete file;
		file = tmp;
	} else {
		// Otherwise, it's uncompressed
		file = _vm->_macResFork->getResource(MKID_BE('Midi'), fileref & 0x3FF);
		if (!file)
			error("Groovie::Music: Couldn't find resource 0x%04X", fileref);
	}

	return loadParser(file, loop);
}

Common::SeekableReadStream *MusicPlayerMac::decompressMidi(Common::SeekableReadStream *stream) {
	// Initialize an output buffer of the given size
	uint32 size = stream->readUint32BE();
	byte *output = (byte *)malloc(size);

	byte *current = output;
	uint32 decompBytes = 0;
	while ((decompBytes < size) && !stream->eos()) {
		// 8 flags
		byte flags = stream->readByte();

		for (byte i = 0; (i < 8) && !stream->eos(); i++) {
			if (flags & 1) {
				// 1: Next byte is a literal
				*(current++) = stream->readByte();
				if (stream->eos())
					continue;
				decompBytes++;
			} else {
				// 0: It's a reference to part of the history
				uint16 args = stream->readUint16BE();
				if (stream->eos())
					continue;

				// Length = 4bit unsigned (3 minimal)
				uint8 length = (args >> 12) + 3;

				// Offset = 12bit signed (all values are negative)
				int16 offset = (args & 0xFFF) | 0xF000;

				// Copy from the past decompressed bytes
				decompBytes += length;
				while (length > 0) {
					*(current) = *(current + offset);
					current++;
					length--;
				}
			}
			flags = flags >> 1;
		}
	}

	// Return the output buffer wrapped in a MemoryReadStream
	return new Common::MemoryReadStream(output, size, DisposeAfterUse::YES);
}

} // End of Groovie namespace