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player_mod.h

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001-2005 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $Header: /cvsroot/scummvm/scummvm/scumm/player_mod.h,v 2.21.2.1 2005/10/18 02:11:21 sev Exp $
 *
 */

#ifndef PLAYER_MOD_H
#define PLAYER_MOD_H

#include "scumm/scumm.h"
#include "sound/audiostream.h"

namespace Audio {
      class RateConverter;
}

namespace Scumm {

/**
 * Generic Amiga MOD mixer - provides a 60Hz 'update' routine.
 */
00038 class Player_MOD : public AudioStream {
public:
      Player_MOD(ScummEngine *scumm);
      virtual ~Player_MOD();
      virtual void setMusicVolume(int vol);

      virtual void startChannel(int id, void *data, int size, int rate, uint8 vol, int loopStart = 0, int loopEnd = 0, int8 pan = 0);
      virtual void stopChannel(int id);
      virtual void setChannelVol(int id, uint8 vol);
      virtual void setChannelPan(int id, int8 pan);
      virtual void setChannelFreq(int id, int freq);

      typedef void ModUpdateProc(void *param);

      virtual void setUpdateProc(ModUpdateProc *proc, void *param, int freq);
      virtual void clearUpdateProc();

      // AudioStream API
00056       int readBuffer(int16 *buffer, const int numSamples) {
            do_mix(buffer, numSamples / 2);
            return numSamples;
      }
00060       bool isStereo() const { return true; }
00061       bool endOfData() const { return false; }
00062       int getRate() const { return _samplerate; }

private:
      enum {
            MOD_MAXCHANS = 24
      };

      struct soundChan {
            int id;
            uint8 vol;
            int8 pan;
            uint16 freq;
            Audio::RateConverter *converter;
            AudioStream *input;
      };

      Audio::Mixer *_mixer;

      uint32 _mixamt;
      uint32 _mixpos;
      int _samplerate;

      soundChan _channels[MOD_MAXCHANS];

      uint8 _maxvol;

      virtual void do_mix(int16 *buf, uint len);

      ModUpdateProc *_playproc;
      void *_playparam;
};

} // End of namespace Scumm

#endif

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