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music.cpp

/* 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-1-2-0/engines/draci/music.cpp $
 * $Id: music.cpp 52738 2010-09-15 22:30:00Z lordhoto $
 *
 */

// MIDI and digital music class

#include "sound/audiostream.h"
#include "sound/mididrv.h"
#include "sound/midiparser.h"
#include "common/config-manager.h"
#include "common/file.h"

#include "draci/draci.h"
#include "draci/music.h"

namespace Draci {

MusicPlayer::MusicPlayer(MidiDriver *driver, const char *pathMask) : _parser(0), _driver(driver), _pathMask(pathMask), _looping(false), _isPlaying(false), _passThrough(false), _isGM(false), _track(-1) {
      memset(_channel, 0, sizeof(_channel));
      memset(_channelVolume, 127, sizeof(_channelVolume));
      _masterVolume = 0;
      _smfParser = MidiParser::createParser_SMF();
      _midiMusicData = NULL;
}

MusicPlayer::~MusicPlayer() {
      _driver->setTimerCallback(NULL, NULL);
      stop();
      this->close();
      _smfParser->setMidiDriver(NULL);
      delete _smfParser;
      delete[] _midiMusicData;
}

void MusicPlayer::setChannelVolume(int channel) {
      int newVolume = _channelVolume[channel] * _masterVolume / 255;
      debugC(3, kDraciSoundDebugLevel, "Music channel %d: volume %d->%d",
            channel, _channelVolume[channel], newVolume);
      _channel[channel]->volume(newVolume);
}

void MusicPlayer::setVolume(int volume) {
      Common::StackLock lock(_mutex);

      volume = CLIP(volume, 0, 255);
      if (_masterVolume == volume)
            return;
      _masterVolume = volume;

      for (int i = 0; i < 16; ++i) {
            if (_channel[i]) {
                  setChannelVolume(i);
            }
      }
}

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;

      if (_nativeMT32)
            _driver->sendMT32Reset();
      else
            _driver->sendGMReset();

      // TODO: Load cmf.ins with the instrument table.  It seems that an
      // interface for such an operation is supported for AdLib.  Maybe for
      // this card, setting instruments is necessary.

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

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

void MusicPlayer::send(uint32 b) {
      if (_passThrough) {
            _driver->send(b);
            return;
      }

      byte channel = (byte)(b & 0x0F);
      if ((b & 0xFFF0) == 0x07B0) {
            // Adjust volume changes by master volume
            byte volume = (byte)((b >> 16) & 0x7F);
            _channelVolume[channel] = volume;
            volume = volume * _masterVolume / 255;
            b = (b & 0xFF00FFFF) | (volume << 16);
      } else if ((b & 0xF0) == 0xC0 && !_isGM && !_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[b & 0x0F])
                  return;
      }

      if (!_channel[channel]) {
            _channel[channel] = (channel == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();
            // If a new channel is allocated during the playback, make sure
            // its volume is correctly initialized.
            if (_channel[channel])
                  setChannelVolume(channel);
      }

      if (_channel[channel])
            _channel[channel]->send(b);
}

void MusicPlayer::metaEvent(byte type, byte *data, uint16 length) {

      switch (type) {
      case 0x2F:  // End of Track
            if (_looping)
                  _parser->jumpToTick(0);
            else
                  stop();
            break;
      default:
            //warning("Unhandled meta event: %02x", type);
            break;
      }
}

void MusicPlayer::onTimer(void *refCon) {
      MusicPlayer *music = (MusicPlayer *)refCon;
      Common::StackLock lock(music->_mutex);

      if (music->_parser)
            music->_parser->onTimer();
}

void MusicPlayer::playSMF(int track, bool loop) {
      if (_isPlaying && track == _track) {
            debugC(2, kDraciSoundDebugLevel, "Already plaing track %d", track);
            return;
      }

      stop();

      _isGM = true;


      // Load MIDI resource data
      Common::File musicFile;
      char musicFileName[40];
      sprintf(musicFileName, _pathMask.c_str(), track);
      musicFile.open(musicFileName);
      if (!musicFile.isOpen()) {
            debugC(2, kDraciSoundDebugLevel, "Cannot open track %d", track);
            return;
      }
      int midiMusicSize = musicFile.size();
      delete[] _midiMusicData;
      _midiMusicData = new byte[midiMusicSize];
      musicFile.read(_midiMusicData, midiMusicSize);
      musicFile.close();

      if (_smfParser->loadMusic(_midiMusicData, midiMusicSize)) {
            MidiParser *parser = _smfParser;
            parser->setTrack(0);
            parser->setMidiDriver(this);
            parser->setTimerRate(getBaseTempo());
            parser->property(MidiParser::mpCenterPitchWheelOnUnload, 1);

            _parser = parser;

            syncVolume();

            _looping = loop;
            _isPlaying = true;
            _track = track;
            debugC(2, kDraciSoundDebugLevel, "Playing track %d", track);
      } else {
            debugC(2, kDraciSoundDebugLevel, "Cannot play track %d", track);
      }
}

void MusicPlayer::stop() {
      Common::StackLock lock(_mutex);

      if (!_isPlaying)
            return;

      debugC(2, kDraciSoundDebugLevel, "Stopping track %d", _track);
      _track = -1;
      _isPlaying = false;
      if (_parser) {
            _parser->unloadMusic();
            _parser = NULL;
      }
}

void MusicPlayer::pause() {
      debugC(2, kDraciSoundDebugLevel, "Pausing track %d", _track);
      setVolume(-1);
      _isPlaying = false;
}

void MusicPlayer::resume() {
      debugC(2, kDraciSoundDebugLevel, "Resuming track %d", _track);
      syncVolume();
      _isPlaying = true;
}

void MusicPlayer::syncVolume() {
      int volume = ConfMan.getInt("music_volume");
      if (ConfMan.getBool("mute")) {
            volume = -1;
      }
      debugC(2, kDraciSoundDebugLevel, "Syncing music volume to %d", volume);
      setVolume(volume);
}

} // End of namespace Draci

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