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midi.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-0-11-1/engines/touche/midi.cpp $
 * $Id: midi.cpp 30944 2008-02-23 22:50:18Z sev $
 *
 */

#include "common/stream.h"

#include "sound/midiparser.h"

#include "touche/midi.h"

namespace Touche {

MidiPlayer::MidiPlayer(MidiDriver *driver, bool nativeMT32)
      : _driver(driver), _parser(0), _midiData(0), _isLooping(false), _isPlaying(false), _masterVolume(0), _nativeMT32(nativeMT32) {
      assert(_driver);
      memset(_channelsTable, 0, sizeof(_channelsTable));
      memset(_channelsVolume, 0, sizeof(_channelsVolume));
      open();
}

MidiPlayer::~MidiPlayer() {
      close();
}

void MidiPlayer::play(Common::ReadStream &stream, int size, bool loop) {
      stop();
      _midiData = (uint8 *)malloc(size);
      if (_midiData) {
            stream.read(_midiData, size);
            _mutex.lock();
            _parser->loadMusic(_midiData, size);
            _parser->setTrack(0);
            _isLooping = loop;
            _isPlaying = true;
            _mutex.unlock();
      }
}

void MidiPlayer::stop() {
      _mutex.lock();
      if (_isPlaying) {
            _isPlaying = false;
            _parser->unloadMusic();
            free(_midiData);
            _midiData = 0;
      }
      _mutex.unlock();
}

void MidiPlayer::updateTimer() {
      _mutex.lock();
      if (_isPlaying) {
            _parser->onTimer();
      }
      _mutex.unlock();
}

void MidiPlayer::adjustVolume(int diff) {
      setVolume(_masterVolume + diff);
}

void MidiPlayer::setVolume(int volume) {
      _masterVolume = CLIP(volume, 0, 255);
      _mutex.lock();
      for (int i = 0; i < NUM_CHANNELS; ++i) {
            if (_channelsTable[i]) {
                  _channelsTable[i]->volume(_channelsVolume[i] * _masterVolume / 255);
            }
      }
      _mutex.unlock();
}

int MidiPlayer::open() {
      int ret = _driver->open();
      if (ret == 0) {
            _parser = MidiParser::createParser_SMF();
            _parser->setMidiDriver(this);
            _parser->setTimerRate(_driver->getBaseTempo());
            _driver->setTimerCallback(this, &timerCallback);
      }
      return ret;
}

void MidiPlayer::close() {
      stop();
      _mutex.lock();
      _driver->setTimerCallback(NULL, NULL);
      _driver->close();
      _driver = 0;
      _parser->setMidiDriver(NULL);
      delete _parser;
      _mutex.unlock();
}

void MidiPlayer::send(uint32 b) {
      byte volume, ch = (byte)(b & 0xF);
      switch (b & 0xFFF0) {
      case 0x07B0: // volume change
            volume = (byte)((b >> 16) & 0x7F);
            _channelsVolume[ch] = volume;
            volume = volume * _masterVolume / 255;
            b = (b & 0xFF00FFFF) | (volume << 16);
            break;
      case 0x7BB0: // all notes off
            if (!_channelsTable[ch]) {
                  // channel not yet allocated, no need to send the event
                  return;
            }
            break;
      default:
            if ((b & 0xF0) == 0xC0 && _nativeMT32) { // program change
                  b = (b & 0xFFFF00FF) | (_gmToRol[(b >> 8) & 0x7F] << 8);
            }
            break;
      }
      if (!_channelsTable[ch]) {
            _channelsTable[ch] = (ch == 9) ? _driver->getPercussionChannel() : _driver->allocateChannel();
      }
      if (_channelsTable[ch]) {
            _channelsTable[ch]->send(b);
      }
}

void MidiPlayer::metaEvent(byte type, byte *data, uint16 length) {
      switch (type) {
      case 0x2F: // end of Track
            if (_isLooping) {
                  _parser->jumpToTick(0);
            } else {
                  stop();
            }
            break;
      default:
//          warning("Unhandled meta event: %02x", type);
            break;
      }
}

void MidiPlayer::timerCallback(void *p) {
      MidiPlayer *player = (MidiPlayer *)p;
      player->updateTimer();
}

} // Touche namespace

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