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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.
*
*/
#include "common/endian.h"
#include "sky/music/adlibmusic.h"
#include "sky/music/adlibchannel.h"
#include "audio/mixer.h"
#include "sky/sky.h"
namespace Sky {
AdLibMusic::AdLibMusic(Audio::Mixer *pMixer, Disk *pDisk) : MusicBase(pMixer, pDisk) {
_driverFileBase = 60202;
_sampleRate = pMixer->getOutputRate();
_opl = makeAdLibOPL(_sampleRate);
_mixer->playStream(Audio::Mixer::kMusicSoundType, &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
}
AdLibMusic::~AdLibMusic() {
OPLDestroy(_opl);
_mixer->stopHandle(_soundHandle);
}
int AdLibMusic::readBuffer(int16 *data, const int numSamples) {
if (_musicData == NULL) {
// no music loaded
memset(data, 0, numSamples * sizeof(int16));
} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
// music loaded but not played as of yet
memset(data, 0, numSamples * sizeof(int16));
// poll anyways as pollMusic() can activate the music
pollMusic();
_nextMusicPoll = _sampleRate / 50;
} else {
uint32 render;
uint remaining = numSamples;
while (remaining) {
render = (remaining > _nextMusicPoll) ? _nextMusicPoll : remaining;
remaining -= render;
_nextMusicPoll -= render;
YM3812UpdateOne(_opl, data, render);
data += render;
if (_nextMusicPoll == 0) {
pollMusic();
_nextMusicPoll = _sampleRate / 50;
}
}
}
return numSamples;
}
void AdLibMusic::setupPointers() {
if (SkyEngine::_systemVars.gameVersion == 109) {
// disk demo uses a different AdLib driver version, some offsets have changed
//_musicDataLoc = (_musicData[0x11CC] << 8) | _musicData[0x11CB];
//_initSequence = _musicData + 0xEC8;
_musicDataLoc = READ_LE_UINT16(_musicData + 0x1200);
_initSequence = _musicData + 0xEFB;
} else if (SkyEngine::_systemVars.gameVersion == 267) {
_musicDataLoc = READ_LE_UINT16(_musicData + 0x11F7);
_initSequence = _musicData + 0xE87;
} else {
_musicDataLoc = READ_LE_UINT16(_musicData + 0x1201);
_initSequence = _musicData + 0xE91;
}
_nextMusicPoll = 0;
}
void AdLibMusic::setupChannels(uint8 *channelData) {
_numberOfChannels = channelData[0];
channelData++;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
uint16 chDataStart = READ_LE_UINT16((uint16 *)channelData + cnt) + _musicDataLoc;
_channels[cnt] = new AdLibChannel(_opl, _musicData, chDataStart);
}
}
void AdLibMusic::startDriver() {
uint16 cnt = 0;
while (_initSequence[cnt] || _initSequence[cnt + 1]) {
OPLWriteReg (_opl, _initSequence[cnt], _initSequence[cnt + 1]);
cnt += 2;
}
}
void AdLibMusic::setVolume(uint16 param) {
_musicVolume = param;
_mixer->setVolumeForSoundType(Audio::Mixer::kMusicSoundType, 2 * param);
}
bool AdLibMusic::isStereo() const {
return false;
}
bool AdLibMusic::endOfData() const {
return false;
}
int AdLibMusic::getRate() const {
return _sampleRate;
}
} // End of namespace Sky
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