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102 lines
2.8 KiB
C++
102 lines
2.8 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "sky/adlibmusic.h"
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#include "sound/fmopl.h"
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void SkyAdlibMusic::passMixerFunc(void *param, int16 *buf, uint len) {
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((SkyAdlibMusic*)param)->premixerCall(buf, len);
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}
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SkyAdlibMusic::SkyAdlibMusic(SoundMixer *pMixer, SkyDisk *pSkyDisk)
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: SkyMusicBase(pSkyDisk) {
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_driverFileBase = 60202;
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_mixer = pMixer;
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_sampleRate = g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0);
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if (0 != YM3812Init(1, 3579545, _sampleRate))
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error("Error initialising YM3812 sound chip emulation");
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_mixer->setupPremix(this, passMixerFunc);
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}
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SkyAdlibMusic::~SkyAdlibMusic(void) {
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_mixer->setupPremix(NULL, NULL);
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YM3812Shutdown();
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}
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void SkyAdlibMusic::premixerCall(int16 *buf, uint len) {
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if (_musicData == NULL) {
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// no music loaded
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memset(buf, 0, len * sizeof(int16));
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return;
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} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
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// music loaded but not played as of yet
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memset(buf, 0, len * sizeof(int16));
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// poll anyways as pollMusic() can activate the music
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pollMusic();
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_nextMusicPoll = _sampleRate/50;
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return;
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}
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uint32 render;
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while (len) {
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render = (len > _nextMusicPoll) ? (_nextMusicPoll) : (len);
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len -= render;
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_nextMusicPoll -= render;
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YM3812UpdateOne(0, buf, render);
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buf += render;
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if (_nextMusicPoll == 0) {
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pollMusic();
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_nextMusicPoll = _sampleRate/50;
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}
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}
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}
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void SkyAdlibMusic::setupPointers(void) {
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_musicDataLoc = (_musicData[0x1202]<<8)|_musicData[0x1201];
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_initSequence = _musicData+0xE91;
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_nextMusicPoll = 0;
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}
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void SkyAdlibMusic::setupChannels(uint8 *channelData) {
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_numberOfChannels = channelData[0];
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channelData++;
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for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
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uint16 chDataStart = ((channelData[(cnt << 1) | 1] << 8) | channelData[cnt << 1]) + _musicDataLoc;
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_channels[cnt] = new SkyAdlibChannel(_musicData, chDataStart);
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}
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}
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void SkyAdlibMusic::startDriver(void) {
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uint16 cnt = 0;
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while (_initSequence[cnt] || _initSequence[cnt+1]) {
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YM3812Write(0, 0, _initSequence[cnt]);
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YM3812Write(0, 1, _initSequence[cnt+1]);
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cnt += 2;
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}
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_allowedCommands = 0xD;
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}
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