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musicbase.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2003-2004 The ScummVM project
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/sky/music/musicbase.h,v 1.14 2004/01/06 12:45:33 fingolfin Exp $
 *
 */

#ifndef MUSICBASE_H
#define MUSICBASE_H

#include "stdafx.h"
#include "common/scummsys.h"
#include "common/system.h"

class OSystem;

namespace Sky {

class Disk;

#define FILES_PER_SECTION 4

typedef struct {
      bool doReInit, doStopMusic;
      uint8 musicToProcess;
} Actions;

class ChannelBase {
public:
      virtual void stopNote(void) = 0;
      virtual uint8 process(uint16 aktTime) = 0;
      virtual void updateVolume(uint16 pVolume) = 0;
      virtual bool isActive(void) = 0;
private:
};

class MusicBase {
public:
      MusicBase(Disk *pDisk, OSystem *system);
      virtual ~MusicBase(void);
      void loadSection(uint8 pSection);
      void musicCommand(uint16 command);
      void startMusic(uint16 param) { _onNextPoll.musicToProcess = param & 0xF; }; // 4
      bool musicIsPlaying(void);
      virtual void setVolume(uint8 volume) = 0;
      uint8 giveVolume(void) { return (uint8)_musicVolume; };
      uint8 giveCurrentMusic(void) { return _currentMusic; };
      
protected:

      OSystem *_system;
      Disk *_skyDisk;
      uint8 *_musicData;
      uint8 _allowedCommands;
      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];
      OSystem::MutexRef _mutex;
      
      virtual void setupPointers(void) = 0;
      virtual void setupChannels(uint8 *channelData) = 0;

      void updateTempo(void);
      void loadNewMusic(void);
      //-                           functions from CommandTable @0x90 (the main interface)
      virtual void startDriver(void) = 0;                                          // 0
      void StopDriver(void);                                                       // 1
      void setTempo(uint16 newTempo);                                              // 2
      void pollMusic();                                                            // 3
      void reinitFM(void) { _onNextPoll.doReInit = true; };                        // 6
      void stopMusic();                                                            // 7
      void setFMVolume(uint16 param);                                              // 13
};

} // End of namespace Sky

#endif //MUSICBASE_H

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