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sound.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2004-2005 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/kyra/sound.cpp,v 1.9.2.1 2005/10/18 02:11:19 sev Exp $
 *
 */

#include "common/stdafx.h"
#include "common/system.h"
#include "kyra/resource.h"
#include "kyra/sound.h"

namespace Kyra {

MusicPlayer::MusicPlayer(MidiDriver *driver, KyraEngine *engine) {
      _engine = engine;
      _driver = driver;
      _passThrough = false;
      _eventFromMusic = false;
      _fadeMusicOut = _sfxIsPlaying = false;
      _fadeStartTime = 0;
      _isPlaying = _isLooping = _nativeMT32 = false;
      _soundEffect = _parser = 0;
      _soundEffectSource = _parserSource = 0;

      memset(_channel, 0, sizeof(MidiChannel*) * 32);
      memset(_channelVolume, 50, sizeof(uint8) * 16);
      _channelVolume[10] = 100;
      for (int i = 0; i < 16; ++i) {
            _virChannel[i] = i;
      }
      _volume = 0;

      int ret = open();
      if (ret != MERR_ALREADY_OPEN && ret != 0) {
            error("couldn't open midi driver");
      }
}

MusicPlayer::~MusicPlayer() {
      _driver->setTimerCallback(NULL, NULL);
      close();
}

void MusicPlayer::setVolume(int volume) {
      if (volume < 0)
            volume = 0;
      else if (volume > 255)
            volume = 255;

      if (_volume == volume)
            return;

      _volume = volume;
      for (int i = 0; i < 32; ++i) {
            if (_channel[i]) {
                  if (i >= 16) {
                        _channel[i]->volume(_channelVolume[i - 16] * _volume / 255);
                  } else {
                        _channel[i]->volume(_channelVolume[i] * _volume / 255);
                  }
            }
      }
}

int MusicPlayer::open() {
      // Don't ever call open without first setting the output driver!
      if (!_driver)
            return 255;

      int ret = _driver->open();
      if (ret)
            return ret;

      _driver->setTimerCallback(this, &onTimer);
      return 0;
}

void MusicPlayer::close() {
      if (_driver)
            _driver->close();
      _driver = 0;
}

void MusicPlayer::send(uint32 b) {
      if (_passThrough) {
            if ((b & 0xFFF0) == 0x007BB0)
                  return;
            _driver->send(b);
            return;
      }

      uint8 channel = (byte)(b & 0x0F);
      if (((b & 0xFFF0) == 0x6FB0 || (b & 0xFFF0) == 0x6EB0) && channel != 9) {
            if (_virChannel[channel] == channel) {
                  _virChannel[channel] = channel + 16;
                  if (!_channel[_virChannel[channel]])
                        _channel[_virChannel[channel]] = _driver->allocateChannel();
                  _channel[_virChannel[channel]]->volume(_channelVolume[channel] * _volume / 255);
            }
            return;
      }

      if ((b & 0xFFF0) == 0x07B0) {
            // Adjust volume changes by master volume
            uint8 volume = (uint8)((b >> 16) & 0x7F);
            _channelVolume[channel] = volume;
            volume = volume * _volume / 255;
            b = (b & 0xFF00FFFF) | (volume << 16);
      } else if ((b & 0xF0) == 0xC0 && !_nativeMT32) {
            b = (b & 0xFFFF00FF) | MidiDriver::_mt32ToGm[(b >> 8) & 0xFF] << 8;
      } else if ((b & 0xFFF0) == 0x007BB0) {
            //Only respond to All Notes Off if this channel
            //has currently been allocated
            if (!_channel[channel])
                  return;
      }

      if (!_channel[_virChannel[channel]]) {
            _channel[_virChannel[channel]] = (channel == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();
            _channel[_virChannel[channel]]->volume(_channelVolume[channel] * _volume / 255);
      }
      if (_channel[_virChannel[channel]])
            _channel[_virChannel[channel]]->send(b);
}

void MusicPlayer::metaEvent(byte type, byte *data, uint16 length) {
      switch (type) {
      case 0x2F:  // End of Track
            if (_eventFromMusic) {
                  if (!_isLooping) {
                        _isPlaying = false;
                  }
                  // remap all channels
                  for (int i = 0; i < 16; ++i) {
                        _virChannel[i] = i;
                  }
            } else {
                  _sfxIsPlaying = false;
            }
            break;
      default:
            _driver->metaEvent(type, data, length);
            break;
      }
}

void MusicPlayer::playMusic(const char *file) {
      uint32 size;
      uint8 *data = (_engine->resource())->fileData(file, &size);

      if (!data) {
            warning("couldn't load '%s'", file);
            return;
      }

      playMusic(data, size);
}

void MusicPlayer::playMusic(uint8 *data, uint32 size) {
      stopMusic();

      _parserSource = data;
      _parser = MidiParser::createParser_XMIDI();
      assert(_parser);

      if (!_parser->loadMusic(data, size)) {
            warning("Error reading track!");
            delete _parser;
            _parser = 0;
            return;
      }

      _parser->setTrack(0);
      _parser->setMidiDriver(this);
      _parser->setTimerRate(getBaseTempo());
      _parser->property(MidiParser::mpAutoLoop, false);
}

void MusicPlayer::loadSoundEffectFile(const char *file) {
      uint32 size;
      uint8 *data = (_engine->resource())->fileData(file, &size);

      if (!data) {
            warning("couldn't load '%s'", file);
            return;
      }

      loadSoundEffectFile(data, size);
}

void MusicPlayer::loadSoundEffectFile(uint8 *data, uint32 size) {
      stopSoundEffect();

      _soundEffectSource = data;
      _soundEffect = MidiParser::createParser_XMIDI();
      assert(_soundEffect);

      if (!_soundEffect->loadMusic(data, size)) {
            warning("Error reading track!");
            delete _parser;
            _parser = 0;
            return;
      }

      _soundEffect->setTrack(0);
      _soundEffect->setMidiDriver(this);
      _soundEffect->setTimerRate(getBaseTempo());
      _soundEffect->property(MidiParser::mpAutoLoop, false);
}

void MusicPlayer::stopMusic() {
      _isLooping = false;
      _isPlaying = false;
      if (_parser) {
            _parser->unloadMusic();
            delete _parser;
            _parser = 0;
            delete [] _parserSource;
            _parserSource = 0;
      }
}

void MusicPlayer::stopSoundEffect() {
      _sfxIsPlaying = false;
      if (_soundEffect) {
            _soundEffect->unloadMusic();
            delete _soundEffect;
            _soundEffect = 0;
            delete [] _soundEffectSource;
            _soundEffectSource = 0;
      }
}

void MusicPlayer::onTimer(void *refCon) {
      MusicPlayer *music = (MusicPlayer *)refCon;

      // this should be set to the fadeToBlack value
      const static uint32 musicFadeTime = 2 * 1000;
      if (music->_fadeMusicOut && music->_fadeStartTime + musicFadeTime > music->_engine->_system->getMillis()) {
            byte volume = (byte)((musicFadeTime - (music->_engine->_system->getMillis() - music->_fadeStartTime)) * 255 / musicFadeTime);
            music->setVolume(volume);
      } else if(music->_fadeStartTime) {
            music->setVolume(255);
            music->_fadeStartTime = 0;
            music->_fadeMusicOut = false;
      }

      if (music->_isPlaying) {
            if (music->_parser) {
                  music->_eventFromMusic = true;
                  music->_parser->onTimer();
            }
      }

      if (music->_sfxIsPlaying) {
            if (music->_soundEffect) {
                  music->_eventFromMusic = false;
                  music->_soundEffect->onTimer();
            }
      }
}

void MusicPlayer::playTrack(uint8 track, bool loop) {
      if (_parser) {
            _isPlaying = true;
            _isLooping = loop;
            _parser->setTrack(track);
            _parser->jumpToTick(0);
            _parser->setTempo(1);
            _parser->property(MidiParser::mpAutoLoop, loop);
      }
}

void MusicPlayer::playSoundEffect(uint8 track) {
      if (_soundEffect) {
            _sfxIsPlaying = true;
            _soundEffect->setTrack(track);
            _soundEffect->jumpToTick(0);
            _soundEffect->property(MidiParser::mpAutoLoop, false);
      }
}

void MusicPlayer::beginFadeOut() {
      // this should be something like fade out...
      _fadeMusicOut = true;
      _fadeStartTime = _engine->_system->getMillis();
}

} // end of namespace Kyra

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