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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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-11-1/engines/igor/midi.h $
 * $Id: midi.h 30944 2008-02-23 22:50:18Z sev $
 *
 */

#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

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