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musicbase.cpp

/* 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.cpp,v 1.21 2004/11/11 10:14:35 lavosspawn Exp $
 *
 */

#include "sky/music/musicbase.h"
#include "sky/disk.h"
#include "common/util.h"

namespace Sky {

MusicBase::MusicBase(Disk *pDisk, OSystem *system) {

      _musicData = NULL;
      _allowedCommands = 0;
      _skyDisk = pDisk;
      _currentMusic = 0;
      _musicVolume = 127;
      _system = system;
      _numberOfChannels = _currentMusic = 0;
      _mutex = _system->createMutex();
}

MusicBase::~MusicBase(void) {

      if (_musicData)
            free(_musicData);
}

void MusicBase::loadSection(uint8 pSection) {

      _system->lockMutex(_mutex);
      if (_currentMusic)
            stopMusic();
      if (_musicData)
            free(_musicData);
      _currentSection = pSection;
      _musicData = _skyDisk->loadFile(_driverFileBase + FILES_PER_SECTION * pSection);
      _allowedCommands = 0;
      _musicTempo0 = 0x78; // init constants taken from idb file, area ~0x1060
      _musicTempo1 = 0xC0;
      _onNextPoll.doReInit = false;
      _onNextPoll.doStopMusic = false;
      _onNextPoll.musicToProcess = 0;
      _tempo = _aktTime = 0x10001;
      _numberOfChannels = _currentMusic = 0;
      setupPointers();
      startDriver();
      _system->unlockMutex(_mutex);
}

bool MusicBase::musicIsPlaying(void) {

      for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
            if (_channels[cnt]->isActive())
                  return true;
      return false;
}

void MusicBase::musicCommand(uint16 command) {

      if (_musicData == NULL) {
            debug(1,"Got music command but driver is not yet loaded");
            return ;
      }
      if ((command >> 8) > _allowedCommands) {
            debug(1,"got musicCommand %d while expecting <= %d", command >> 8, _allowedCommands);
            return ;
      }
      switch(command >> 8) {
      case 0: 
            debug(1,"Music: got call to startAdlibDriver(). Not necessary in this implementation.");
            break;
      case 1: 
            debug(1,"Music: got call to stopDriver(). Not necessary in this implementation.");
            break;
      case 2:
            debug(1,"Music: got call to SetTempo(). Tempo is fixed in this implementation.");
            break;
      case 3: 
            debug(1,"Music: ignored direct call to driverPoll().");
            break;
      case 4: 
            startMusic(command & 0xFF);
            break;
      case 6:
            reinitFM();
            break;
      case 7:
            stopMusic();
            break;
      case 13: 
            setFMVolume(command & 0xFF); 
            break;
      default: 
            debug(1,"musicCommand %d ignored.",command >> 8);
      }
}

void MusicBase::setFMVolume(uint16 param) {

      _musicVolume = param;
      for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
            _channels[cnt]->updateVolume(_musicVolume);
}

void MusicBase::stopMusic(void) {

      for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
            _channels[cnt]->stopNote();
            delete _channels[cnt];
      }
      _numberOfChannels = 0;
}

void MusicBase::updateTempo(void) {

      uint16 tempoMul = _musicTempo0 * _musicTempo1;
      uint16 divisor = 0x4446390/ 23864;
      _tempo = (tempoMul / divisor) << 16;
      _tempo |= (((tempoMul%divisor) << 16) | (tempoMul / divisor)) / divisor;
}

void MusicBase::loadNewMusic(void) {

      uint16 musicPos;
      if (_onNextPoll.musicToProcess > _musicData[_musicDataLoc]) {
            error("Music %d requested but doesn't exist in file.", _onNextPoll.musicToProcess);
            return;
      }
      if (_currentMusic != 0)
            stopMusic();

      _currentMusic = _onNextPoll.musicToProcess;

      if (_currentMusic != 0) {
            musicPos = (_musicData[_musicDataLoc + 2] << 8) | _musicData[_musicDataLoc+1];
            musicPos += _musicDataLoc+((_currentMusic-1) << 1);
            musicPos = ((_musicData[musicPos+1] << 8) | _musicData[musicPos]) + _musicDataLoc;

            _musicTempo0 = _musicData[musicPos];
            _musicTempo1 = _musicData[musicPos+1];

            setupChannels(_musicData + musicPos + 2);

            updateTempo();
      }
}

void MusicBase::pollMusic(void) {

      _system->lockMutex(_mutex);
      uint8 newTempo;
      if (_onNextPoll.doReInit) startDriver();
      if (_onNextPoll.doStopMusic) stopMusic();
      if (_onNextPoll.musicToProcess != _currentMusic)
            loadNewMusic();

      _aktTime += _tempo;

      for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
            newTempo = _channels[cnt]->process((uint16)(_aktTime >> 16));
            if (newTempo) {
                  _musicTempo1 = newTempo;
                  updateTempo();
            }
      }
      _system->unlockMutex(_mutex);
      _aktTime &= 0xFFFF;
}

} // End of namespace Sky

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