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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#include "sky/music/adlibmusic.h"
#include "sound/fmopl.h"
void SkyAdlibMusic::passMixerFunc(void *param, int16 *buf, uint len) {
((SkyAdlibMusic*)param)->premixerCall(buf, len);
}
SkyAdlibMusic::SkyAdlibMusic(SoundMixer *pMixer, SkyDisk *pSkyDisk, OSystem *system)
: SkyMusicBase(pSkyDisk, system) {
_driverFileBase = 60202;
_mixer = pMixer;
_sampleRate = g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0);
if (0 != YM3812Init(1, 3579545, _sampleRate))
error("Error initialising YM3812 sound chip emulation");
_mixer->setupPremix(this, passMixerFunc);
}
SkyAdlibMusic::~SkyAdlibMusic(void) {
_mixer->setupPremix(NULL, NULL);
YM3812Shutdown();
}
void SkyAdlibMusic::setVolume(uint8 volume) {
_musicVolume = volume;
_mixer->setMusicVolume(_musicVolume << 1);
}
void SkyAdlibMusic::premixerCall(int16 *buf, uint len) {
if (_musicData == NULL) {
// no music loaded
memset(buf, 0, len * sizeof(int16));
return;
} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
// music loaded but not played as of yet
memset(buf, 0, len * sizeof(int16));
// poll anyways as pollMusic() can activate the music
pollMusic();
_nextMusicPoll = _sampleRate/50;
return;
}
uint32 render;
while (len) {
render = (len > _nextMusicPoll) ? (_nextMusicPoll) : (len);
len -= render;
_nextMusicPoll -= render;
YM3812UpdateOne(0, buf, render);
buf += render;
if (_nextMusicPoll == 0) {
pollMusic();
_nextMusicPoll = _sampleRate/50;
}
}
}
void SkyAdlibMusic::setupPointers(void) {
if (SkyState::_systemVars.gameVersion == 267) {
// disk demo uses a different adlib driver version, some offsets have changed
_musicDataLoc = (_musicData[0x11F8] << 8) | _musicData[0x11F7];
_initSequence = _musicData + 0xE87;
} else {
_musicDataLoc = (_musicData[0x1202] << 8) | _musicData[0x1201];
_initSequence = _musicData + 0xE91;
}
_nextMusicPoll = 0;
}
void SkyAdlibMusic::setupChannels(uint8 *channelData) {
_numberOfChannels = channelData[0];
channelData++;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
uint16 chDataStart = ((channelData[(cnt << 1) | 1] << 8) | channelData[cnt << 1]) + _musicDataLoc;
_channels[cnt] = new SkyAdlibChannel(_musicData, chDataStart);
}
}
void SkyAdlibMusic::startDriver(void) {
uint16 cnt = 0;
while (_initSequence[cnt] || _initSequence[cnt+1]) {
YM3812Write(0, 0, _initSequence[cnt]);
YM3812Write(0, 1, _initSequence[cnt+1]);
cnt += 2;
}
_allowedCommands = 0xD;
}
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