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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 "sky/music/musicbase.h"
#include "sky/disk.h"
#include "common/util.h"
#include "common/endian.h"
namespace Sky {
MusicBase::MusicBase(Disk *pDisk) {
_musicData = NULL;
_skyDisk = pDisk;
_currentMusic = 0;
_musicVolume = 127;
_numberOfChannels = _currentMusic = 0;
}
MusicBase::~MusicBase() {
stopMusic();
free(_musicData);
}
void MusicBase::loadSection(uint8 pSection) {
Common::StackLock lock(_mutex);
if (_currentMusic)
stopMusicInternal();
free(_musicData);
_currentSection = pSection;
_musicData = _skyDisk->loadFile(_driverFileBase + FILES_PER_SECTION * pSection);
_musicTempo0 = 0x78; // init constants taken from idb file, area ~0x1060
_musicTempo1 = 0xC0;
_onNextPoll.musicToProcess = 0;
_tempo = _aktTime = 0x10001;
_numberOfChannels = _currentMusic = 0;
setupPointers();
startDriver();
}
bool MusicBase::musicIsPlaying() {
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
if (_channels[cnt]->isActive())
return true;
return false;
}
void MusicBase::stopMusic() {
Common::StackLock lock(_mutex);
stopMusicInternal();
}
void MusicBase::stopMusicInternal() {
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
delete _channels[cnt];
_numberOfChannels = 0;
}
void MusicBase::updateTempo() {
uint16 tempoMul = _musicTempo0 * _musicTempo1;
uint16 divisor = 0x4446390/ 23864;
_tempo = (tempoMul / divisor) << 16;
_tempo |= (((tempoMul % divisor) << 16) | (tempoMul / divisor)) / divisor;
}
void MusicBase::loadNewMusic() {
uint16 musicPos;
if (_onNextPoll.musicToProcess > _musicData[_musicDataLoc]) {
error("Music %d requested but doesn't exist in file.", _onNextPoll.musicToProcess);
return;
}
if (_currentMusic != 0)
stopMusicInternal();
_currentMusic = _onNextPoll.musicToProcess;
if (_currentMusic != 0) {
musicPos = READ_LE_UINT16(_musicData + _musicDataLoc + 1);
musicPos += _musicDataLoc + ((_currentMusic - 1) << 1);
musicPos = READ_LE_UINT16(_musicData + musicPos) + _musicDataLoc;
_musicTempo0 = _musicData[musicPos];
_musicTempo1 = _musicData[musicPos+1];
setupChannels(_musicData + musicPos + 2);
updateTempo();
}
}
void MusicBase::pollMusic() {
Common::StackLock lock(_mutex);
uint8 newTempo;
if (_onNextPoll.musicToProcess != _currentMusic)
loadNewMusic();
_aktTime += _tempo;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
newTempo = _channels[cnt]->process((uint16)(_aktTime >> 16));
if (newTempo) {
_musicTempo1 = newTempo;
updateTempo();
}
}
_aktTime &= 0xFFFF;
}
void MusicBase::startMusic(uint16 param) {
_onNextPoll.musicToProcess = param & 0xF;
}
uint8 MusicBase::giveVolume() {
return (uint8)_musicVolume;
}
uint8 MusicBase::giveCurrentMusic() {
return _currentMusic;
}
} // End of namespace Sky
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