Max Horn e70fd59b35 ENGINES: Further simplify pseudo MidiDrivers; fix some regressions
The regression affected AGOS and maybe some others; specifically,
the real MidiDriver would have been deleted twice -- I previously
missed that the Engine instances takes care of freeing the real
MidiDriver, not the MidiPlayer wrapping it.

This commit should clarify the ownership of the real MidiDriver for
most pseudo MidiDrivers.
2011-03-23 16:49:41 +01:00

164 lines
4.1 KiB
C++

/* 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.
*
* $URL$
* $Id$
*
*/
#include "common/config-manager.h"
#include "common/stream.h"
#include "audio/midiparser.h"
#include "touche/midi.h"
namespace Touche {
MidiPlayer::MidiPlayer()
: _driver(0), _parser(0), _midiData(0), _isLooping(false), _isPlaying(false), _masterVolume(0) {
memset(_channelsTable, 0, sizeof(_channelsTable));
memset(_channelsVolume, 0, sizeof(_channelsVolume));
MidiDriver::DeviceHandle dev = MidiDriver::detectDevice(MDT_MIDI | MDT_ADLIB | MDT_PREFER_GM);
_nativeMT32 = ((MidiDriver::getMusicType(dev) == MT_MT32) || ConfMan.getBool("native_mt32"));
_driver = MidiDriver::createMidi(dev);
int ret = _driver->open();
if (ret == 0) {
_parser = MidiParser::createParser_SMF();
_parser->setMidiDriver(this);
_parser->setTimerRate(_driver->getBaseTempo());
_driver->setTimerCallback(this, &timerCallback);
if (_nativeMT32)
_driver->sendMT32Reset();
else
_driver->sendGMReset();
}
}
MidiPlayer::~MidiPlayer() {
stop();
Common::StackLock lock(_mutex);
_driver->setTimerCallback(NULL, NULL);
_driver->close();
delete _driver;
_driver = 0;
_parser->setMidiDriver(NULL);
delete _parser;
}
void MidiPlayer::play(Common::ReadStream &stream, int size, bool loop) {
stop();
_midiData = (uint8 *)malloc(size);
if (_midiData) {
stream.read(_midiData, size);
Common::StackLock lock(_mutex);
_parser->loadMusic(_midiData, size);
_parser->setTrack(0);
_isLooping = loop;
_isPlaying = true;
}
}
void MidiPlayer::stop() {
Common::StackLock lock(_mutex);
if (_isPlaying) {
_isPlaying = false;
_parser->unloadMusic();
free(_midiData);
_midiData = 0;
}
}
void MidiPlayer::updateTimer() {
Common::StackLock lock(_mutex);
if (_isPlaying) {
_parser->onTimer();
}
}
void MidiPlayer::adjustVolume(int diff) {
setVolume(_masterVolume + diff);
}
void MidiPlayer::setVolume(int volume) {
_masterVolume = CLIP(volume, 0, 255);
Common::StackLock lock(_mutex);
for (int i = 0; i < NUM_CHANNELS; ++i) {
if (_channelsTable[i]) {
_channelsTable[i]->volume(_channelsVolume[i] * _masterVolume / 255);
}
}
}
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