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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-1-1-0/engines/agos/midi.h $
 * $Id: midi.h 45616 2009-11-02 21:54:57Z fingolfin $
 *
 */

#ifndef AGOS_MIDI_H
#define AGOS_MIDI_H

#include "sound/mididrv.h"
#include "sound/midiparser.h"
#include "common/mutex.h"

namespace Common {
      class File;
}

namespace AGOS {

struct MusicInfo {
      MidiParser *parser;
      byte *data;
      byte num_songs;           // For Type 1 SMF resources
      byte *songs[16];          // For Type 1 SMF resources
      uint32 song_sizes[16];    // For Type 1 SMF resources

      MidiChannel *channel[16]; // Dynamic remapping of channels to resolve conflicts
      byte volume[16];          // Current channel volume

      MusicInfo() { clear(); }
      void clear() {
            parser = 0; data = 0; num_songs = 0;
            memset(songs, 0, sizeof(songs));
            memset(song_sizes, 0, sizeof(song_sizes));
            memset(channel, 0, sizeof(channel));
      }
};

class MidiPlayer : public MidiDriver {
protected:
      Common::Mutex _mutex;
      MidiDriver *_driver;
      bool _map_mt32_to_gm;
      bool _passThrough;

      MusicInfo _music;
      MusicInfo _sfx;
      MusicInfo *_current; // Allows us to establish current context for operations.

      // These are maintained for both music and SFX
      byte _masterVolume;    // 0-255
      byte _musicVolume;
      byte _sfxVolume;
      bool _paused;

      // These are only used for music.
      byte _currentTrack;
      bool _loopTrack;
      byte _queuedTrack;
      bool _loopQueuedTrack;

protected:
      static void onTimer(void *data);
      void clearConstructs();
      void clearConstructs(MusicInfo &info);
      void resetVolumeTable();

public:
      bool _enable_sfx;

public:
      MidiPlayer();
      virtual ~MidiPlayer();

      void loadSMF(Common::File *in, int song, bool sfx = false);
      void loadMultipleSMF(Common::File *in, bool sfx = false);
      void loadXMIDI(Common::File *in, bool sfx = false);
      void loadS1D(Common::File *in, bool sfx = false);

      void mapMT32toGM(bool map);
      void setLoop(bool loop);
      void startTrack(int track);
      void queueTrack(int track, bool loop);
      bool isPlaying(bool check_queued = false) { return (_currentTrack != 255 && (_queuedTrack != 255 || !check_queued)); }

      void stop();
      void pause(bool b);

      int  getMusicVolume() { return _musicVolume; }
      int  getSFXVolume() { return _sfxVolume; }
      void setVolume(int musicVol, int sfxVol);
      void setDriver(MidiDriver *md);

public:
      // MidiDriver interface implementation
      int open();
      void close();
      void send(uint32 b);

      void metaEvent(byte type, byte *data, uint16 length);
      void setPassThrough(bool b)         { _passThrough = b; }

      // Timing functions - MidiDriver now operates timers
      void setTimerCallback(void *timer_param, void (*timer_proc) (void *)) { }
      uint32 getBaseTempo() { return _driver ? _driver->getBaseTempo() : 0; }

      // Channel allocation functions
      MidiChannel *allocateChannel() { return 0; }
      MidiChannel *getPercussionChannel() { return 0; }
};

} // End of namespace AGOS

#endif

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