aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/resource_audio.cpp
blob: 9949373852c7639a92af187febd795b0c5e9acf5 (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
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
/* 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.
 *
 * $URL$
 * $Id$
 *
 */

// Resource library

#include "common/archive.h"
#include "common/file.h"

#include "sci/resource.h"
#include "sci/resource_intern.h"
#include "sci/util.h"

namespace Sci {

AudioVolumeResourceSource::AudioVolumeResourceSource(ResourceManager *resMan, const Common::String &name, ResourceSource *map, int volNum)
	: VolumeResourceSource(name, map, volNum, kSourceAudioVolume) {

	_audioCompressionType = 0;
	_audioCompressionOffsetMapping = NULL;

	/*
	 * Check if this audio volume got compressed by our tool. If that is the
	 * case, set _audioCompressionType and read in the offset translation
	 * table for later usage.
	 */

	Common::SeekableReadStream *fileStream = getVolumeFile(resMan, 0);
	if (!fileStream)
		return;

	fileStream->seek(0, SEEK_SET);
	uint32 compressionType = fileStream->readUint32BE();
	switch (compressionType) {
	case MKID_BE('MP3 '):
	case MKID_BE('OGG '):
	case MKID_BE('FLAC'):
		// Detected a compressed audio volume
		_audioCompressionType = compressionType;
		// Now read the whole offset mapping table for later usage
		int32 recordCount = fileStream->readUint32LE();
		if (!recordCount)
			error("compressed audio volume doesn't contain any entries");
		int32 *offsetMapping = new int32[(recordCount + 1) * 2];
		_audioCompressionOffsetMapping = offsetMapping;
		for (int recordNo = 0; recordNo < recordCount; recordNo++) {
			*offsetMapping++ = fileStream->readUint32LE();
			*offsetMapping++ = fileStream->readUint32LE();
		}
		// Put ending zero
		*offsetMapping++ = 0;
		*offsetMapping++ = fileStream->size();
	}

	if (_resourceFile)
		delete fileStream;
}

bool Resource::loadFromWaveFile(Common::SeekableReadStream *file) {
	data = new byte[size];

	uint32 really_read = file->read(data, size);
	if (really_read != size)
		error("Read %d bytes from %s but expected %d", really_read, _id.toString().c_str(), size);

	_status = kResStatusAllocated;
	return true;
}

bool Resource::loadFromAudioVolumeSCI11(Common::SeekableReadStream *file) {
	// Check for WAVE files here
	uint32 riffTag = file->readUint32BE();
	if (riffTag == MKID_BE('RIFF')) {
		_headerSize = 0;
		size = file->readUint32LE() + 8;
		file->seek(-8, SEEK_CUR);
		return loadFromWaveFile(file);
	}
	file->seek(-4, SEEK_CUR);

	ResourceType type = _resMan->convertResType(file->readByte());
	if (((getType() == kResourceTypeAudio || getType() == kResourceTypeAudio36) && (type != kResourceTypeAudio))
		|| ((getType() == kResourceTypeSync || getType() == kResourceTypeSync36) && (type != kResourceTypeSync))) {
		warning("Resource type mismatch loading %s", _id.toString().c_str());
		unalloc();
		return false;
	}

	_headerSize = file->readByte();

	if (type == kResourceTypeAudio) {
		if (_headerSize != 7 && _headerSize != 11 && _headerSize != 12) {
			warning("Unsupported audio header");
			unalloc();
			return false;
		}

		if (_headerSize != 7) { // Size is defined already from the map
			// Load sample size
			file->seek(7, SEEK_CUR);
			size = file->readUint32LE();
			// Adjust offset to point at the header data again
			file->seek(-11, SEEK_CUR);
		}
	}

	return loadPatch(file);
}

bool Resource::loadFromAudioVolumeSCI1(Common::SeekableReadStream *file) {
	data = new byte[size];

	if (data == NULL) {
		error("Can't allocate %d bytes needed for loading %s", size, _id.toString().c_str());
	}

	unsigned int really_read = file->read(data, size);
	if (really_read != size)
		warning("Read %d bytes from %s but expected %d", really_read, _id.toString().c_str(), size);

	_status = kResStatusAllocated;
	return true;
}

void ResourceManager::addNewGMPatch(SciGameId gameId) {
	Common::String gmPatchFile;

	switch (gameId) {
	case GID_ECOQUEST:
		gmPatchFile = "ECO1GM.PAT";
		break;
	case GID_HOYLE3:
		gmPatchFile = "HOY3GM.PAT";
		break;
	case GID_LSL1:
		gmPatchFile = "LL1_GM.PAT";
		break;
	case GID_LSL5:
		gmPatchFile = "LL5_GM.PAT";
		break;
	case GID_LONGBOW:
		gmPatchFile = "ROBNGM.PAT";
		break;
	case GID_SQ1:
		gmPatchFile = "SQ1_GM.PAT";
		break;
	case GID_SQ4:
		gmPatchFile = "SQ4_GM.PAT";
		break;
	case GID_FAIRYTALES:
		gmPatchFile = "TALEGM.PAT";
		break;
	default:
		break;
	}

	if (!gmPatchFile.empty() && Common::File::exists(gmPatchFile)) {
		ResourceSource *psrcPatch = new PatchResourceSource(gmPatchFile);
		processPatch(psrcPatch, kResourceTypePatch, 4);
	}
}

void ResourceManager::processWavePatch(ResourceId resourceId, Common::String name) {
	ResourceSource *resSrc = new WaveResourceSource(name);
	Common::File file;
	file.open(name);

	updateResource(resourceId, resSrc, file.size());

	debugC(1, kDebugLevelResMan, "Patching %s - OK", name.c_str());
}

void ResourceManager::readWaveAudioPatches() {
	// Here we do check for SCI1.1+ so we can patch wav files in as audio resources
	Common::ArchiveMemberList files;
	SearchMan.listMatchingMembers(files, "*.wav");

	for (Common::ArchiveMemberList::const_iterator x = files.begin(); x != files.end(); ++x) {
		Common::String name = (*x)->getName();

		if (isdigit(name[0]))
			processWavePatch(ResourceId(kResourceTypeAudio, atoi(name.c_str())), name);
	}
}

void ResourceManager::removeAudioResource(ResourceId resId) {
	// Remove resource, unless it was loaded from a patch
	if (_resMap.contains(resId)) {
		Resource *res = _resMap.getVal(resId);

		if (res->_source->getSourceType() == kSourceAudioVolume) {
			if (res->_status == kResStatusLocked) {
				warning("Failed to remove resource %s (still in use)", resId.toString().c_str());
			} else {
				if (res->_status == kResStatusEnqueued)
					removeFromLRU(res);

				_resMap.erase(resId);
				delete res;
			}
		}
	}
}

// Early SCI1.1 65535.MAP structure (uses RESOURCE.AUD):
// =========
// 6-byte entries:
// w nEntry
// dw offset

// Late SCI1.1 65535.MAP structure (uses RESOURCE.SFX):
// =========
// 5-byte entries:
// w nEntry
// tb offset (cumulative)

// QFG3 Demo 0.MAP structure:
// =========
// 10-byte entries:
// w nEntry
// dw offset
// dw size

// LB2 Floppy/Mother Goose SCI1.1 0.MAP structure:
// =========
// 8-byte entries:
// w nEntry
// w 0xffff
// dw offset

// Early SCI1.1 MAP structure:
// ===============
// 10-byte entries:
// b noun
// b verb
// b cond
// b seq
// dw offset
// w syncSize + syncAscSize

// Late SCI1.1 MAP structure:
// ===============
// Header:
// dw baseOffset
// Followed by 7 or 11-byte entries:
// b noun
// b verb
// b cond
// b seq
// tb cOffset (cumulative offset)
// w syncSize (iff seq has bit 7 set)
// w syncAscSize (iff seq has bit 6 set)

int ResourceManager::readAudioMapSCI11(ResourceSource *map) {
#ifndef ENABLE_SCI32
	// SCI32 support is not built in. Check if this is a SCI32 game
	// and if it is abort here.
	if (_volVersion >= kResVersionSci2)
		return SCI_ERROR_RESMAP_NOT_FOUND;
#endif

	uint32 offset = 0;
	Resource *mapRes = findResource(ResourceId(kResourceTypeMap, map->_volumeNumber), false);

	if (!mapRes) {
		warning("Failed to open %i.MAP", map->_volumeNumber);
		return SCI_ERROR_RESMAP_NOT_FOUND;
	}

	ResourceSource *src = findVolume(map, 0);

	if (!src)
		return SCI_ERROR_NO_RESOURCE_FILES_FOUND;

	byte *ptr = mapRes->data;

	// Heuristic to detect entry size
	uint32 entrySize = 0;
	for (int i = mapRes->size - 1; i >= 0; --i) {
		if (ptr[i] == 0xff)
			entrySize++;
		else
			break;
	}

	if (map->_volumeNumber == 65535) {
		while (ptr < mapRes->data + mapRes->size) {
			uint16 n = READ_LE_UINT16(ptr);
			ptr += 2;

			if (n == 0xffff)
				break;

			if (entrySize == 6) {
				offset = READ_LE_UINT32(ptr);
				ptr += 4;
			} else {
				offset += READ_LE_UINT24(ptr);
				ptr += 3;
			}

			addResource(ResourceId(kResourceTypeAudio, n), src, offset);
		}
	} else if (map->_volumeNumber == 0 && entrySize == 10 && ptr[3] == 0) {
		// QFG3 demo format
		// ptr[3] would be 'seq' in the normal format and cannot possibly be 0
		while (ptr < mapRes->data + mapRes->size) {
			uint16 n = READ_BE_UINT16(ptr);
			ptr += 2;

			if (n == 0xffff)
				break;

			offset = READ_LE_UINT32(ptr);
			ptr += 4;
			uint32 size = READ_LE_UINT32(ptr);
			ptr += 4;

			addResource(ResourceId(kResourceTypeAudio, n), src, offset, size);
		}
	} else if (map->_volumeNumber == 0 && entrySize == 8 && READ_LE_UINT16(ptr + 2) == 0xffff) {
		// LB2 Floppy/Mother Goose SCI1.1 format
		Common::SeekableReadStream *stream = getVolumeFile(src);

		while (ptr < mapRes->data + mapRes->size) {
			uint16 n = READ_LE_UINT16(ptr);
			ptr += 4;

			if (n == 0xffff)
				break;

			offset = READ_LE_UINT32(ptr);
			ptr += 4;

			// The size is not stored in the map and the entries have no order.
			// We need to dig into the audio resource in the volume to get the size.
			stream->seek(offset + 1);
			byte headerSize = stream->readByte();
			assert(headerSize == 11 || headerSize == 12);
			
			stream->skip(5);
			uint32 size = stream->readUint32LE() + headerSize + 2;

			addResource(ResourceId(kResourceTypeAudio, n), src, offset, size);
		}
	} else {
		bool isEarly = (entrySize != 11); 

		if (!isEarly) {
			offset = READ_LE_UINT32(ptr);
			ptr += 4;
		}

		while (ptr < mapRes->data + mapRes->size) {
			uint32 n = READ_BE_UINT32(ptr);
			int syncSize = 0;
			ptr += 4;

			if (n == 0xffffffff)
				break;

			if (isEarly) {
				offset = READ_LE_UINT32(ptr);
				ptr += 4;
			} else {
				offset += READ_LE_UINT24(ptr);
				ptr += 3;
			}

			if (isEarly || (n & 0x80)) {
				syncSize = READ_LE_UINT16(ptr);
				ptr += 2;

				if (syncSize > 0)
					addResource(ResourceId(kResourceTypeSync36, map->_volumeNumber, n & 0xffffff3f), src, offset, syncSize);
			}

			if (n & 0x40) {
				// This seems to define the size of raw lipsync data (at least
				// in kq6), may also just be general appended data.
				syncSize += READ_LE_UINT16(ptr);
				ptr += 2;
			}

			addResource(ResourceId(kResourceTypeAudio36, map->_volumeNumber, n & 0xffffff3f), src, offset + syncSize);
		}
	}

	return 0;
}

// AUDIOnnn.MAP contains 10-byte entries:
// Early format:
// w 5 bits resource type and 11 bits resource number
// dw 7 bits volume number and 25 bits offset
// dw size
// Later format:
// w nEntry
// dw offset+volume (as in resource.map)
// dw size
// ending with 10 0xFFs
int ResourceManager::readAudioMapSCI1(ResourceSource *map, bool unload) {
	Common::File file;

	if (!file.open(map->getLocationName()))
		return SCI_ERROR_RESMAP_NOT_FOUND;

	bool oldFormat = (file.readUint16LE() >> 11) == kResourceTypeAudio;
	file.seek(0);

	while (1) {
		uint16 n = file.readUint16LE();
		uint32 offset = file.readUint32LE();
		uint32 size = file.readUint32LE();

		if (file.eos() || file.err()) {
			warning("Error while reading %s", map->getLocationName().c_str());
			return SCI_ERROR_RESMAP_NOT_FOUND;
		}

		if (n == 0xffff)
			break;

		byte volume_nr;

		if (oldFormat) {
			n &= 0x07ff; // Mask out resource type
			volume_nr = offset >> 25; // most significant 7 bits
			offset &= 0x01ffffff; // least significant 25 bits
		} else {
			volume_nr = offset >> 28; // most significant 4 bits
			offset &= 0x0fffffff; // least significant 28 bits
		}

		ResourceSource *src = findVolume(map, volume_nr);

		if (src) {
			if (unload)
				removeAudioResource(ResourceId(kResourceTypeAudio, n));
			else
				addResource(ResourceId(kResourceTypeAudio, n), src, offset, size);
		} else {
			warning("Failed to find audio volume %i", volume_nr);
		}
	}

	return 0;
}

void ResourceManager::setAudioLanguage(int language) {
	if (_audioMapSCI1) {
		if (_audioMapSCI1->_volumeNumber == language) {
			// This language is already loaded
			return;
		}

		// We already have a map loaded, so we unload it first
		readAudioMapSCI1(_audioMapSCI1, true);

		// Remove all volumes that use this map from the source list
		Common::List<ResourceSource *>::iterator it = _sources.begin();
		while (it != _sources.end()) {
			ResourceSource *src = *it;
			if (src->findVolume(_audioMapSCI1, src->_volumeNumber)) {
				it = _sources.erase(it);
				delete src;
			} else {
				++it;
			}
		}

		// Remove the map itself from the source list
		_sources.remove(_audioMapSCI1);
		delete _audioMapSCI1;

		_audioMapSCI1 = NULL;
	}

	char filename[9];
	snprintf(filename, 9, "AUDIO%03d", language);

	Common::String fullname = Common::String(filename) + ".MAP";
	if (!Common::File::exists(fullname)) {
		warning("No audio map found for language %i", language);
		return;
	}

	_audioMapSCI1 = addSource(new ExtAudioMapResourceSource(fullname, language));

	// Search for audio volumes for this language and add them to the source list
	Common::ArchiveMemberList files;
	SearchMan.listMatchingMembers(files, Common::String(filename) + ".0??");
	for (Common::ArchiveMemberList::const_iterator x = files.begin(); x != files.end(); ++x) {
		const Common::String name = (*x)->getName();
		const char *dot = strrchr(name.c_str(), '.');
		int number = atoi(dot + 1);

		addSource(new AudioVolumeResourceSource(this, name, _audioMapSCI1, number));
	}

	scanNewSources();
}

int ResourceManager::getAudioLanguage() const {
	return (_audioMapSCI1 ? _audioMapSCI1->_volumeNumber : 0);
}

bool ResourceManager::isGMTrackIncluded() {
	// This check only makes sense for SCI1 and newer games
	if (getSciVersion() < SCI_VERSION_1_EARLY)
		return false;

	// SCI2 and newer games always have GM tracks
	if (getSciVersion() >= SCI_VERSION_2)
		return true;

	// For the leftover games, we can safely use SCI_VERSION_1_EARLY for the soundVersion
	const SciVersion soundVersion = SCI_VERSION_1_EARLY;

	// Read the first song and check if it has a GM track
	bool result = false;
	Common::List<ResourceId> *resources = listResources(kResourceTypeSound, -1);
	Common::sort(resources->begin(), resources->end());
	Common::List<ResourceId>::iterator itr = resources->begin();
	int firstSongId = itr->getNumber();
	delete resources;

	SoundResource *song1 = new SoundResource(firstSongId, this, soundVersion);
	if (!song1) {
		warning("ResourceManager::isGMTrackIncluded: track 1 not found");
		return false;
	}

	SoundResource::Track *gmTrack = song1->getTrackByType(0x07);
	if (gmTrack)
		result = true;

	delete song1;

	return result;
}

SoundResource::SoundResource(uint32 resourceNr, ResourceManager *resMan, SciVersion soundVersion) : _resMan(resMan), _soundVersion(soundVersion) {
	Resource *resource = _resMan->findResource(ResourceId(kResourceTypeSound, resourceNr), true);
	int trackNr, channelNr;
	if (!resource)
		return;

	_innerResource = resource;

	byte *data, *data2;
	byte *dataEnd;
	Channel *channel, *sampleChannel;

	switch (_soundVersion) {
	case SCI_VERSION_0_EARLY:
	case SCI_VERSION_0_LATE:
		// SCI0 only has a header of 0x11/0x21 byte length and the actual midi track follows afterwards
		_trackCount = 1;
		_tracks = new Track[_trackCount];
		_tracks->digitalChannelNr = -1;
		_tracks->type = 0; // Not used for SCI0
		_tracks->channelCount = 1;
		// Digital sample data included? -> Add an additional channel
		if (resource->data[0] == 2)
			_tracks->channelCount++;
		_tracks->channels = new Channel[_tracks->channelCount];
		memset(_tracks->channels, 0, sizeof(Channel) * _tracks->channelCount);
		channel = &_tracks->channels[0];
		if (_soundVersion == SCI_VERSION_0_EARLY) {
			channel->data = resource->data + 0x11;
			channel->size = resource->size - 0x11;
		} else {
			channel->data = resource->data + 0x21;
			channel->size = resource->size - 0x21;
		}
		if (_tracks->channelCount == 2) {
			// Digital sample data included
			_tracks->digitalChannelNr = 1;
			sampleChannel = &_tracks->channels[1];
			// we need to find 0xFC (channel terminator) within the data
			data = channel->data;
			dataEnd = channel->data + channel->size;
			while ((data < dataEnd) && (*data != 0xfc))
				data++;
			// Skip any following 0xFCs as well
			while ((data < dataEnd) && (*data == 0xfc))
				data++;
			// Now adjust channels accordingly
			sampleChannel->data = data;
			sampleChannel->size = channel->size - (data - channel->data);
			channel->size = data - channel->data;
			// Read sample header information
			//Offset 14 in the header contains the frequency as a short integer. Offset 32 contains the sample length, also as a short integer.
			_tracks->digitalSampleRate = READ_LE_UINT16(sampleChannel->data + 14);
			_tracks->digitalSampleSize = READ_LE_UINT16(sampleChannel->data + 32);
			_tracks->digitalSampleStart = 0;
			_tracks->digitalSampleEnd = 0;
			sampleChannel->data += 44; // Skip over header
			sampleChannel->size -= 44;
		}
		break;

	case SCI_VERSION_1_EARLY:
	case SCI_VERSION_1_LATE:
	case SCI_VERSION_2_1:
		data = resource->data;
		// Count # of tracks
		_trackCount = 0;
		while ((*data++) != 0xFF) {
			_trackCount++;
			while (*data != 0xFF)
				data += 6;
			data++;
		}
		_tracks = new Track[_trackCount];
		data = resource->data;

		byte channelCount;

		for (trackNr = 0; trackNr < _trackCount; trackNr++) {
			// Track info starts with track type:BYTE
			// Then the channel information gets appended Unknown:WORD, ChannelOffset:WORD, ChannelSize:WORD
			// 0xFF:BYTE as terminator to end that track and begin with another track type
			// Track type 0xFF is the marker signifying the end of the tracks

			_tracks[trackNr].type = *data++;
			// Counting # of channels used
			data2 = data;
			channelCount = 0;
			while (*data2 != 0xFF) {
				data2 += 6;
				channelCount++;
				_tracks[trackNr].channelCount++;
			}
			_tracks[trackNr].channels = new Channel[channelCount];
			_tracks[trackNr].channelCount = 0;
			_tracks[trackNr].digitalChannelNr = -1; // No digital sound associated
			_tracks[trackNr].digitalSampleRate = 0;
			_tracks[trackNr].digitalSampleSize = 0;
			_tracks[trackNr].digitalSampleStart = 0;
			_tracks[trackNr].digitalSampleEnd = 0;
			if (_tracks[trackNr].type != 0xF0) { // Digital track marker - not supported currently
				channelNr = 0;
				while (channelCount--) {
					channel = &_tracks[trackNr].channels[channelNr];
					channel->prio = READ_LE_UINT16(data);
					uint dataOffset = READ_LE_UINT16(data + 2);
					if (dataOffset < resource->size) {
						channel->data = resource->data + dataOffset;
						channel->size = READ_LE_UINT16(data + 4);
						channel->curPos = 0;
						// FIXME: number contains (low nibble) channel and (high nibble) flags
						// 0x20 is set on rhythm channels to prevent remapping
						channel->number = *channel->data;
						channel->poly = *(channel->data + 1);
						channel->time = channel->prev = 0;
						channel->data += 2; // skip over header
						channel->size -= 2; // remove header size
						if (channel->number == 0xFE) { // Digital channel
							_tracks[trackNr].digitalChannelNr = channelNr;
							_tracks[trackNr].digitalSampleRate = READ_LE_UINT16(channel->data);
							_tracks[trackNr].digitalSampleSize = READ_LE_UINT16(channel->data + 2);
							_tracks[trackNr].digitalSampleStart = READ_LE_UINT16(channel->data + 4);
							_tracks[trackNr].digitalSampleEnd = READ_LE_UINT16(channel->data + 6);
							channel->data += 8; // Skip over header
							channel->size -= 8;
						}
						_tracks[trackNr].channelCount++;
						channelNr++;
					} else {
						warning("Invalid offset inside sound resource %d: track %d, channel %d", resourceNr, trackNr, channelNr);
					}
					data += 6;
				}
			} else {
				// Skip over digital track
				data += 6;
			}
			data++; // Skipping 0xFF that closes channels list
		}
		break;

	default:
		error("SoundResource: SCI version %d is unsupported", _soundVersion);
	}
}

SoundResource::~SoundResource() {
	for (int trackNr = 0; trackNr < _trackCount; trackNr++)
		delete[] _tracks[trackNr].channels;
	delete[] _tracks;

	_resMan->unlockResource(_innerResource);
}

#if 0
SoundResource::Track* SoundResource::getTrackByNumber(uint16 number) {
	if (_soundVersion <= SCI_VERSION_0_LATE)
		return &_tracks[0];

	if (/*number >= 0 &&*/number < _trackCount)
		return &_tracks[number];
	return NULL;
}
#endif

SoundResource::Track *SoundResource::getTrackByType(byte type) {
	if (_soundVersion <= SCI_VERSION_0_LATE)
		return &_tracks[0];

	for (int trackNr = 0; trackNr < _trackCount; trackNr++) {
		if (_tracks[trackNr].type == type)
			return &_tracks[trackNr];
	}
	return NULL;
}

SoundResource::Track *SoundResource::getDigitalTrack() {
	for (int trackNr = 0; trackNr < _trackCount; trackNr++) {
		if (_tracks[trackNr].digitalChannelNr != -1)
			return &_tracks[trackNr];
	}
	return NULL;
}

// Gets the filter mask for SCI0 sound resources
int SoundResource::getChannelFilterMask(int hardwareMask, bool wantsRhythm) {
	byte *data = _innerResource->data;
	int channelMask = 0;

	if (_soundVersion > SCI_VERSION_0_LATE)
		return 0;

	data++; // Skip over digital sample flag

	for (int channelNr = 0; channelNr < 16; channelNr++) {
		channelMask = channelMask >> 1;

		byte flags;

		if (_soundVersion == SCI_VERSION_0_EARLY) {
			// Each channel is specified by a single byte
			// Upper 4 bits of the byte is a voices count
			// Lower 4 bits -> bit 0 set: use for AdLib
			//				   bit 1 set: use for PCjr
			//				   bit 2 set: use for PC speaker
			//				   bit 3 set and bit 0 clear: control channel (15)
			//				   bit 3 set and bit 0 set: rhythm channel (9)
			// Note: control channel is dynamically assigned inside the drivers,
			// but seems to be fixed at 15 in the song data.
			flags = *data++;

			// Get device bits
			flags &= 0x7;
		} else {
			// Each channel is specified by 2 bytes
			// 1st byte is voices count
			// 2nd byte is play mask, which specifies if the channel is supposed to be played
			// by the corresponding hardware

			// Skip voice count
			data++;

			flags = *data++;
		}

		bool play;
		switch (channelNr) {
		case 15:
			// Always play control channel
			play = true;
			break;
		case 9:
			// Play rhythm channel when requested
			play = wantsRhythm;
			break;
		default:
			// Otherwise check for flag
			play = flags & hardwareMask;
		}

		if (play) {
			// This Channel is supposed to be played by the hardware
			channelMask |= 0x8000;
		}
	}

	return channelMask;
}

byte SoundResource::getInitialVoiceCount(byte channel) {
	byte *data = _innerResource->data;

	if (_soundVersion > SCI_VERSION_0_LATE)
		return 0; // TODO

	data++; // Skip over digital sample flag

	if (_soundVersion == SCI_VERSION_0_EARLY)
		return data[channel] >> 4;
	else
		return data[channel * 2];
}

} // End of namespace Sci