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Diffstat (limited to 'engines/touche/midi.cpp')
-rw-r--r-- | engines/touche/midi.cpp | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/engines/touche/midi.cpp b/engines/touche/midi.cpp new file mode 100644 index 0000000000..cc07897c30 --- /dev/null +++ b/engines/touche/midi.cpp @@ -0,0 +1,157 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2006 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. + * + * $URL$ + * $Id$ + * + */ + +#include "common/stdafx.h" +#include "common/mutex.h" +#include "common/stream.h" + +#include "sound/midiparser.h" + +#include "touche/midi.h" + +namespace Touche { + +MidiPlayer::MidiPlayer(MidiDriver *driver) + : _masterVolume(255), _isPlaying(false), _driver(driver), _parser(0), _midiData(0) { + 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::setVolume(int volume) { + if (volume < 0) { + volume = 0; + } else if (volume > 255) { + volume = 255; + } + for (int i = 0; i < NUM_CHANNELS; ++i) { + if (_channelsTable[i]) { + _channelsTable[i]->volume(_channelsVolume[i] * _masterVolume / 255); + } + } +} + +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() { + _mutex.lock(); + _driver->setTimerCallback(NULL, NULL); + _mutex.unlock(); + stop(); + _parser->setMidiDriver(NULL); + delete _parser; + _driver->close(); + _driver = 0; +} + +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; + } + 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 |