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music.cpp
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202 lines (159 loc) · 4.23 KB
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/* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/system.h"
#include "gamos/gamos.h"
namespace Gamos {
MidiMusic::MidiMusic() {
MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_PREFER_GM);
_driver = MidiDriver::createMidi(dev);
_driver->open();
_driver->sendGMReset();
}
MidiMusic::~MidiMusic() {
g_system->getTimerManager()->removeTimerProc(_timerProc);
if (_driver) {
_driver->stopAllNotes(true);
_driver->close();
delete _driver;
}
}
void MidiMusic::stopMusic() {
g_system->getTimerManager()->removeTimerProc(_timerProc);
if (_mutex.lock()) {
_driver->stopAllNotes(true);
_mutex.unlock();
}
}
bool MidiMusic::playMusic(Common::Array<byte> *midiData) {
stopMusic();
if (!midiData || midiData->size() <= 4)
return false;
if (!_mutex.lock())
return false;
_pMidiData = *midiData;
_dataStart = 4;
_dataPos = _dataStart;
_midiDelayTicks = 1;
_midiDelayCount = 1;
if (_pMidiData[_dataPos] == 0xf8) {
_dataPos++;
midi2low();
_dataPos++;
}
g_system->getTimerManager()->installTimerProc(_timerProc, 10 * 1000, this, "Gamos::Music");
_mutex.unlock();
return true;
}
void MidiMusic::update() {
while (true) {
if (_dataPos >= _pMidiData.size())
return;
uint8 b = _pMidiData[_dataPos];
if (b > 0x7f) {
/* only if new event type then update _midiOp */
_midiOp = b;
_dataPos++;
}
bool doDelay = true;
if (_midiOp == 0xf0 || _midiOp == 0xf7) {
int16 skipLen = midi2low();
if (skipLen >= 0)
_dataPos += skipLen;
} else if (_midiOp == 0xff) {
if (_midiDelayTicks != -1) {
_midiDelayCount = _midiDelayTicks;
_dataPos = _dataStart;
} else {
g_system->getTimerManager()->removeTimerProc(_timerProc);
_driver->stopAllNotes(true);
}
break;
} else {
uint8 param1 = _pMidiData[_dataPos];
uint8 param2 = 0;
_dataPos++;
bool doSend = true;
uint8 cmd = _midiOp & 0xf0;
if (cmd != MidiDriver_BASE::MIDI_COMMAND_PROGRAM_CHANGE &&
cmd != MidiDriver_BASE::MIDI_COMMAND_CHANNEL_AFTERTOUCH) {
if (cmd == MidiDriver_BASE::MIDI_COMMAND_NOTE_OFF ||
cmd == MidiDriver_BASE::MIDI_COMMAND_NOTE_ON) {
if (_midiMute)
doSend = false;
}
b = _pMidiData[_dataPos];
_dataPos++;
doDelay = (b & 0x80) == 0;
param2 = b & 0x7f;
if (cmd == MidiDriver_BASE::MIDI_COMMAND_NOTE_ON)
param2 = param2 * _volume / 255;
}
if (doSend)
_driver->send(_midiOp, param1, param2);
}
if (doDelay) {
int16 ln = midi2low();
if (ln > 0) {
_midiTimeStamp += ln * 10;
if (g_system->getMillis() < _midiTimeStamp)
break;
}
}
}
}
void MidiMusic::setVolume(uint8 volume) {
if (volume == 0) {
_midiMute = true;
_driver->stopAllNotes();
} else
_midiMute = false;
_volume = volume;
}
int16 MidiMusic::midi2low() {
if (_dataPos >= _pMidiData.size())
return -1;
int16 dat = _pMidiData[_dataPos];
_dataPos++;
if (dat & 0x80) {
if (_dataPos >= _pMidiData.size())
return -1;
dat &= 0x7f;
dat |= _pMidiData[_dataPos] << 7;
_dataPos++;
}
return dat;
}
void MidiMusic::_timerProc(void *data) {
if (!data)
return;
MidiMusic *_this = (MidiMusic *)data;
if (_this->_midiDelayCount != 0) {
_this->_midiDelayCount--;
if (_this->_midiDelayCount != 0)
return;
_this->_midiTimeStamp = g_system->getMillis();
}
if (_this->_midiTimeStamp <= g_system->getMillis() && _this->_mutex.lock()) {
_this->update();
_this->_mutex.unlock();
}
}
}