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music.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 * Original ADL-Player source Copyright (C) 2004 by Patrick Combet aka Dorian Gray
 *
 * 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://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/gob/music.h $
 * $Id: music.h 22790 2006-05-31 08:44:14Z drmccoy $
 *
 */

#ifndef GOB_MUSIC_H
#define GOB_MUSIC_H

#include "sound/audiostream.h"
#include "sound/mixer.h"
#include "sound/fmopl.h"
#include "common/mutex.h"

#include "gob/gob.h"

namespace Gob {

class GobEngine;

class Music : public Audio::AudioStream {
public:
      Music(GobEngine *vm);
      virtual ~Music();

      void lock() { _mutex.lock(); }
      void unlock() { _mutex.unlock(); }
      bool playing() { return _playing; }
      bool getRepeating(void) { return _repCount != 0; }
      void setRepeating (int32 repCount) { _repCount = repCount; }
      virtual void startPlay(void);
      virtual void stopPlay(void) { _mutex.lock(); _playing = false; _mutex.unlock(); }
      virtual void playTrack(const char *trackname);
      virtual void playBgMusic(void);
      virtual bool loadMusic(const char *filename);
      virtual void loadFromMemory(byte *data);
      virtual void unloadMusic(void);

// AudioStream API
      int readBuffer(int16 *buffer, const int numSamples) {
            premixerCall(buffer, numSamples / 2);
            return numSamples;
      }
      bool isStereo() const { return true; }
      bool endOfData() const { return false; }
      int getRate() const { return _rate; }
      
protected:
      static const char *_tracks[][2];
      static const char *_tracksToFiles[][2];
      static const unsigned char _operators[];
      static const unsigned char _volRegNums [];
      FM_OPL *_opl;
      byte *_data;
      byte *_playPos;
      uint32 _dataSize;
      uint32 _rate;
      short _freqs[25][12];
      byte _notes[11];
      byte _notCol[11];
      byte _notLin[11];
      bool _notOn[11];
      byte _pollNotes[16];
      uint32 _samplesTillPoll;
      int32 _repCount;
      bool _playing;
      bool _first;
      bool _ended;
      bool _needFree;
      Common::Mutex _mutex;
      GobEngine *_vm;

      void premixerCall(int16 *buf, uint len);
      void writeOPL(byte reg, byte val);
      void setFreqs(void);
      void reset(void);
      void setVoices();
      void setVoice(byte voice, byte instr, bool set);
      void setKey(byte voice, byte note, bool on, bool spec);
      void setVolume(byte voice, byte volume);
      void pollMusic(void);
};

class Music_Dummy: public Music {
public:
      Music_Dummy(GobEngine *vm) : Music(vm) {
            _vm->_mixer->setupPremix(0);
            OPLDestroy(_opl);
      }

      virtual void startPlay(void) {};
      virtual void stopPlay(void) {};
      virtual void playTrack(const char *trackname) {};
      virtual void playBgMusic(void) {};
      virtual bool loadMusic(const char *filename) { return true; };
      virtual void loadFromMemory(byte *data) {};
      virtual void unloadMusic(void) {};

      virtual ~Music_Dummy() {};
};

} // End of namespace Gob

#endif

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