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engines/sky/music/musicbase.h

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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/>.
+ *
+ */
+
+#ifndef SKY_MUSIC_MUSICBASE_H
+#define SKY_MUSIC_MUSICBASE_H
+
+
+#include "common/scummsys.h"
+#include "common/mutex.h"
+
+#include "audio/mixer.h"
+
+namespace Audio {
+class SeekableAudioStream;
+}
+
+namespace Sky {
+
+class Disk;
+
+#define FILES_PER_SECTION 4
+
+typedef struct {
+	uint8 musicToProcess;
+	Audio::SeekableAudioStream *stream;
+} Actions;
+
+class ChannelBase {
+public:
+	virtual ~ChannelBase() {}
+	virtual uint8 process(uint16 aktTime) = 0;
+	virtual void updateVolume(uint16 pVolume) = 0;
+	virtual bool isActive() = 0;
+private:
+};
+
+class MusicBase {
+public:
+	MusicBase(Audio::Mixer *pMixer, Disk *pDisk);
+	virtual ~MusicBase();
+	void loadSection(uint8 pSection);
+	void startMusic(uint16 param);
+	void stopMusic();
+	bool musicIsPlaying();
+	uint8 giveVolume();
+	uint8 giveCurrentMusic();
+	virtual void setVolume(uint16 param) = 0;
+
+protected:
+
+	Audio::Mixer *_mixer;
+	Disk *_skyDisk;
+	uint8 *_musicData;
+
+	uint16 _musicDataLoc;
+	uint16 _driverFileBase;
+
+	uint16 _musicVolume, _numberOfChannels;
+	uint8 _currentMusic, _currentSection;
+	uint8 _musicTempo0; // can be changed by music stream
+	uint8 _musicTempo1; // given once per music
+	uint32 _tempo;      // calculated from musicTempo0 and musicTempo1
+	uint32 _aktTime;
+	Actions _onNextPoll;
+	ChannelBase *_channels[10];
+	Common::Mutex _mutex;
+	Audio::SoundHandle _musicHandle;
+
+	virtual void setupPointers() = 0;
+	virtual void setupChannels(uint8 *channelData) = 0;
+	virtual void startDriver() = 0;
+
+	void updateTempo();
+	void loadNewMusic();
+	void pollMusic();
+
+	void stopMusicInternal();
+};
+
+} // End of namespace Sky
+
+#endif //MUSICBASE_H