scummvm/engines/igor/midi.h

/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef IGOR_MIDI_H
#define IGOR_MIDI_H

#include "common/util.h"
#include "common/mutex.h"

#include "sound/fmopl.h"
#include "sound/mididrv.h"
#include "sound/midiparser.h"
#include "sound/softsynth/emumidi.h"

namespace Igor {

enum {
	kAdlibCarrier = 0,
	kAdlibModulator
};

struct AdlibInstrument {
	uint8 chr[2];
	uint8 scale[2];
	uint8 attack[2];
	uint8 sustain[2];
	uint8 waveSel[2];
	uint8 feedback;
};

class MidiParser_CTMF : public MidiParser {
public:

	enum {
		kMaxInstruments = 16
	};

	MidiParser_CTMF();
	~MidiParser_CTMF() {}

	bool loadMusic(byte *data, uint32 size);

	AdlibInstrument _instruments[kMaxInstruments];
	int _instrumentsCount;

protected:

	void decodeHeader(const uint8 *p);
	void decodeAdlibInstrument(struct AdlibInstrument *ins, const uint8 *p);

	void parseNextEvent(EventInfo &info);

private:

	int _instrumentsDataOffset;
	int _midiDataOffset;
	int _ticksPerQuarter;
	int _ticksPerSecond;
	int _basicTempo;
};

class AdlibMidiDriver : public MidiDriver_Emulated {
public:

	enum {
		kAdlibChannelsCount = 18
	};

	AdlibMidiDriver(Audio::Mixer *mixer) : MidiDriver_Emulated(mixer) {}
	~AdlibMidiDriver() {}

	// MidiDriver
	int open();
	void close();
	void send(uint32 b);
	void metaEvent(byte type, byte *data, uint16 length) {}
	void sysEx(const byte *msg, uint16 length) {}
	MidiChannel *allocateChannel() { return 0; }
	MidiChannel *getPercussionChannel() { return 0; }

	// AudioStream
	bool isStereo() const { return false; }
	int getRate() const { return _mixer->getOutputRate(); }

	// MidiDriver_Emulated
	void generateSamples(int16 *buf, int len);

	void setInstruments(AdlibInstrument *i) { _adlibInstruments = i; }

private:

	void adlibWrite(int port, int value);
	void adlibSetupCard();
	void adlibTurnNoteOff(int channel, int note);
	void adlibTurnNoteOn(int channel, int note, int velocity);
	void adlibSetupInstrument(int channel, const AdlibInstrument &ins);
	void adlibSetupPercussion(int channel, const AdlibInstrument &ins);
	void adlibSetupNote(int channel, int note, int velocity);
	void adlibEndNote(int channel);
	void adlibSetVolume(int channel, int volume);
	void adlibControlChange(int channel, int control, int param);
	void adlibProgramChange(int channel, int num);

	FM_OPL *_opl;
	uint8 _adlibData[256];
	bool _adlibRhythmMode;
	struct {
		int ch;
		int note;
		int lt;
	} _adlibChannels[kAdlibChannelsCount];
	int _adlibInstrumentsMappingTable[kAdlibChannelsCount];
	AdlibInstrument *_adlibInstruments;

	static const uint8 _adlibOperatorsTable[];
	static const uint8 _adlibChannelsMappingTable[];
	static const int16 _adlibNoteFreqTable[];
	static const uint8 _adlibPercussionsMappingTable[];
};

class IgorEngine;

class MidiPlayer {
public:

	MidiPlayer(IgorEngine *vm);
	~MidiPlayer();

	void playMusic(uint8 *data, uint32 size);
	void stopMusic();

private:

	void updateTimer();
	static void updateTimerCallback(void *p) { ((MidiPlayer *)p)->updateTimer(); }

	MidiParser_CTMF *_parser;
	AdlibMidiDriver *_driver;
	Common::Mutex _mutex;
	bool _isPlaying;
};

} // namespace Igor

#endif