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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 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 "groovie/music.h"
#include "groovie/resource.h"
namespace Groovie {
MusicPlayer::MusicPlayer(GroovieEngine *vm) :
_vm(vm), _midiParser(NULL), _data(NULL), _driver(NULL),
_backgroundFileRef(0) {
// Create the parser
_midiParser = MidiParser::createParser_XMIDI();
// Create the driver
int driver = detectMusicDriver(MDT_MIDI | MDT_ADLIB | MDT_PREFER_MIDI);
_driver = createMidi(driver);
_driver->open();
// Initialize the channel volumes
for (int i = 0; i < 0x10; i++) {
_chanVolumes[i] = 0x7F;
}
// Set the parser's driver
_midiParser->setMidiDriver(this);
// Set the timer rate
_midiParser->setTimerRate(_driver->getBaseTempo());
}
MusicPlayer::~MusicPlayer() {
// Unload the parser
unload();
delete _midiParser;
// Unload the MIDI Driver
_driver->close();
delete _driver;
}
void MusicPlayer::playSong(uint16 fileref) {
// Play the referenced file once
play(fileref, false);
}
void MusicPlayer::setBackgroundSong(uint16 fileref) {
_backgroundFileRef = fileref;
}
void MusicPlayer::setUserVolume(uint16 volume) {
// Save the new user volume
_userVolume = volume;
if (_userVolume > 0x100) _userVolume = 0x100;
// Apply it to all the channels
for (int i = 0; i < 0x10; i++) {
updateChanVolume(i);
}
//FIXME: AdlibPercussionChannel::controlChange() is empty
//(can't set the volume for the percusion channel)
}
void MusicPlayer::setGameVolume(uint16 volume, uint16 time) {
//TODO: Implement volume fading
debugC(5, kGroovieDebugMIDI | kGroovieDebugAll, "setting game volume: %d, %d\n", volume, time);
// Save the new game volume
_gameVolume = volume;
if (_gameVolume > 100) _gameVolume = 100;
// Apply it to all the channels
for (int i = 0; i < 0x10; i++) {
updateChanVolume(i);
}
}
void MusicPlayer::updateChanVolume(byte channel) {
// Generate a MIDI Control change message for the volume
uint32 b = 0x7B0;
// Specify the channel
b |= (channel & 0xF);
// Scale by the user and game volumes
uint32 val = (_chanVolumes[channel] * _userVolume * _gameVolume) / 0x100 / 100;
val &= 0x7F;
// Send it to the driver
_driver->send(b | (val << 16));
}
bool MusicPlayer::play(uint16 fileref, bool loop) {
// Unload the previous song
unload();
// Set the looping option
_midiParser->property(MidiParser::mpAutoLoop, loop);
// Load the new file
return load(fileref);
}
bool MusicPlayer::load(uint16 fileref) {
// Open the song resource
Common::SeekableReadStream *xmidiFile = _vm->_resMan->open(fileref);
if (!xmidiFile) {
error("Groovie::Music: Couldn't resource 0x%04X", fileref);
return false;
}
// Read the whole file to memory
int length = xmidiFile->size();
_data = new byte[length];
xmidiFile->read(_data, length);
delete xmidiFile;
// Start parsing the data
if (!_midiParser->loadMusic(_data, length)) {
error("Groovie::Music: Invalid XMI file");
return false;
}
// Activate the timer source
_driver->setTimerCallback(_midiParser, MidiParser::timerCallback);
return true;
}
void MusicPlayer::unload() {
// Unload the parser
_midiParser->unloadMusic();
// Unload the xmi file
delete[] _data;
_data = NULL;
}
int MusicPlayer::open() {
return 0;
}
void MusicPlayer::close() {}
void MusicPlayer::send(uint32 b) {
if ((b & 0xFFF0) == 0x07B0) { // Volume change
// Save the specific channel volume
byte chan = b & 0xF;
_chanVolumes[chan] = (b >> 16) & 0x7F;
// Send the updated value
updateChanVolume(chan);
return;
}
_driver->send(b);
}
void MusicPlayer::metaEvent(byte type, byte *data, uint16 length) {
switch (type) {
case 0x2F:
// End of Track, play the background song
if (_backgroundFileRef) {
play(_backgroundFileRef, true);
}
break;
default:
_driver->metaEvent(type, data, length);
break;
}
}
void MusicPlayer::setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc) {
_driver->setTimerCallback(timer_param, timer_proc);
}
uint32 MusicPlayer::getBaseTempo(void) {
return _driver->getBaseTempo();
}
MidiChannel *MusicPlayer::allocateChannel() {
return _driver->allocateChannel();
}
MidiChannel *MusicPlayer::getPercussionChannel() {
return _driver->getPercussionChannel();
}
} // End of Groovie namespace
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