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engines/lab/music.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * This code is based on Labyrinth of Time code with assistance of
+ *
+ * Copyright (c) 1993 Terra Nova Development
+ * Copyright (c) 2004 The Wyrmkeep Entertainment Co.
+ *
+ */
+
+#include "common/file.h"
+#include "audio/audiostream.h"
+#include "audio/decoders/raw.h"
+
+#include "lab/lab.h"
+
+#include "lab/anim.h"
+#include "lab/eventman.h"
+#include "lab/music.h"
+#include "lab/resource.h"
+
+namespace Lab {
+
+#define CLOWNROOM           123
+#define DIMROOM              80
+
+Music::Music(LabEngine *vm) : _vm(vm) {
+	_musicFile = nullptr;
+	_storedPos = 0;
+}
+
+byte Music::getSoundFlags() {
+	byte soundFlags = Audio::FLAG_LITTLE_ENDIAN;
+	if (_vm->getPlatform() == Common::kPlatformWindows)
+		soundFlags |= Audio::FLAG_16BITS;
+	else if (_vm->getPlatform() == Common::kPlatformDOS)
+		soundFlags |= Audio::FLAG_UNSIGNED;
+
+	return soundFlags;
+}
+
+void Music::loadSoundEffect(const Common::String &filename, bool loop, bool waitTillFinished) {
+	stopSoundEffect();
+
+	Common::File *file = _vm->_resource->openDataFile(filename, MKTAG('D', 'I', 'F', 'F'));
+	if (!file)
+		return;
+
+	_vm->_anim->_doBlack = false;
+
+	uint32 magicBytes = file->readUint32LE();
+	if (magicBytes != 1219009121) {
+		warning("readSound: Bad signature, skipping");
+		return;
+	}
+	uint32 soundTag = file->readUint32LE();
+	uint32 soundSize = file->readUint32LE();
+
+	if (soundTag != 0)
+		return;
+
+	file->skip(soundSize);	// skip the header
+
+	while (soundTag != 65535) {
+		_vm->updateEvents();
+		soundTag = file->readUint32LE();
+		soundSize = file->readUint32LE() - 8;
+
+		if ((soundTag == 30) || (soundTag == 31)) {
+			if (waitTillFinished) {
+				while (isSoundEffectActive()) {
+					_vm->updateEvents();
+					_vm->waitTOF();
+				}
+			}
+
+			file->skip(4);
+
+			uint16 sampleRate = file->readUint16LE();
+			file->skip(2);
+			playSoundEffect(sampleRate, soundSize, loop, file);
+		} else if (soundTag == 65535) {
+			if (waitTillFinished) {
+				while (isSoundEffectActive()) {
+					_vm->updateEvents();
+					_vm->waitTOF();
+				}
+			}
+		} else
+			file->skip(soundSize);
+	}
+}
+
+void Music::playSoundEffect(uint16 sampleSpeed, uint32 length, bool loop, Common::File *dataFile) {
+	stopSoundEffect();
+
+	// NOTE: We need to use malloc(), cause this will be freed with free()
+	// by the music code
+	byte *soundData = (byte *)malloc(length);
+	dataFile->read(soundData, length);
+
+	Audio::SeekableAudioStream *audioStream = Audio::makeRawStream((const byte *)soundData, length, MAX<uint16>(sampleSpeed, 4000), getSoundFlags());
+	_vm->_mixer->playStream(Audio::Mixer::kSFXSoundType, &_sfxHandle, new Audio::LoopingAudioStream(audioStream, (loop) ? 0 : 1));
+}
+
+void Music::stopSoundEffect() {
+	if (isSoundEffectActive())
+		_vm->_mixer->stopHandle(_sfxHandle);
+}
+
+bool Music::isSoundEffectActive() const {
+	return _vm->_mixer->isSoundHandleActive(_sfxHandle);
+}
+
+void Music::changeMusic(const Common::String &filename, bool storeCurPos, bool seektoStoredPos) {
+	if (storeCurPos)
+		_storedPos = _musicFile->pos();
+
+	stopSoundEffect();
+	freeMusic();
+	_musicFile = _vm->_resource->openDataFile(filename);
+	if (seektoStoredPos)
+		_musicFile->seek(_storedPos);
+
+	Audio::SeekableAudioStream *audioStream = Audio::makeRawStream(_musicFile, 15000, getSoundFlags());
+	_vm->_mixer->playStream(Audio::Mixer::kMusicSoundType, &_musicHandle, new Audio::LoopingAudioStream(audioStream, 0, DisposeAfterUse::YES, false));
+}
+
+void Music::resetMusic(bool seektoStoredPos) {
+	if (_vm->getPlatform() != Common::kPlatformAmiga)
+		changeMusic("Music:BackGrou", false, seektoStoredPos);
+	else
+		changeMusic("Music:BackGround", false, seektoStoredPos);
+}
+
+void Music::checkRoomMusic(uint16 prevRoom, uint16 newRoom) {
+	if (newRoom == CLOWNROOM)
+		changeMusic("Music:Laugh", true, false);
+	else if (newRoom == DIMROOM)
+		changeMusic("Music:Rm81", true, false);
+	else if (prevRoom == CLOWNROOM || prevRoom == DIMROOM)
+		resetMusic(true);
+}
+
+void Music::freeMusic() {
+	_vm->_mixer->stopHandle(_musicHandle);
+	_vm->_mixer->stopHandle(_sfxHandle);
+	_musicFile = nullptr;
+}
+
+} // End of namespace Lab