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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.
*
*/
#ifndef SCUMM_PLAYER_AD_H
#define SCUMM_PLAYER_AD_H
#include "scumm/music.h"
#include "audio/audiostream.h"
#include "audio/mixer.h"
#include "common/mutex.h"
namespace OPL {
class OPL;
}
namespace Scumm {
class ScummEngine;
/**
* Sound output for v3/v4 AdLib data.
*/
class Player_AD : public MusicEngine, public Audio::AudioStream {
public:
Player_AD(ScummEngine *scumm, Audio::Mixer *mixer);
virtual ~Player_AD();
// MusicEngine API
virtual void setMusicVolume(int vol);
virtual void startSound(int sound);
virtual void stopSound(int sound);
virtual void stopAllSounds();
virtual int getMusicTimer();
virtual int getSoundStatus(int sound) const;
virtual void saveLoadWithSerializer(Serializer *ser);
// AudioStream API
virtual int readBuffer(int16 *buffer, const int numSamples);
virtual bool isStereo() const { return false; }
virtual bool endOfData() const { return false; }
virtual int getRate() const { return _rate; }
private:
ScummEngine *const _vm;
Common::Mutex _mutex;
Audio::Mixer *const _mixer;
const int _rate;
Audio::SoundHandle _soundHandle;
void setupVolume();
OPL::OPL *_opl2;
int _samplesPerCallback;
int _samplesPerCallbackRemainder;
int _samplesTillCallback;
int _samplesTillCallbackRemainder;
int _soundPlaying;
int _engineMusicTimer;
// AdLib register utilities
uint8 _registerBackUpTable[256];
void writeReg(int r, int v);
uint8 readReg(int r) const;
// Instrument setup
void setupChannel(const uint channel, uint instrOffset) {
setupChannel(channel, _resource + instrOffset);
}
void setupChannel(const uint channel, const byte *instrOffset);
void setupOperator(const uint opr, const byte *&instrOffset);
static const int _operatorOffsetTable[18];
// Sound data
const byte *_resource;
// Music handling
void startMusic();
void updateMusic();
void noteOff(uint channel);
int findFreeChannel();
void setupFrequency(uint channel, int8 frequency);
void setupRhythm(uint rhythmInstr, uint instrOffset);
uint _timerLimit;
uint _musicTicks;
uint _musicTimer;
uint _internalMusicTimer;
bool _loopFlag;
uint _musicLoopStart;
uint _instrumentOffset[16];
uint _channelLastEvent[9];
uint _channelFrequency[9];
uint _channelB0Reg[9];
uint _mdvdrState;
uint _voiceChannels;
uint _curOffset;
uint _nextEventTimer;
static const uint _noteFrequencies[12];
static const uint _mdvdrTable[6];
static const uint _rhythmOperatorTable[6];
static const uint _rhythmChannelTable[6];
// SFX handling
void startSfx();
void updateSfx();
void clearChannel(int channel);
void updateChannel(int channel);
void parseSlot(int channel);
void updateSlot(int channel);
void parseNote(int channel, int num, const byte *offset);
bool processNote(int note, const byte *offset);
void noteOffOn(int channel);
void writeRegisterSpecial(int note, uint8 value, int offset);
uint8 readRegisterSpecial(int note, uint8 defaultValue, int offset);
void setupNoteEnvelopeState(int note, int steps, int adjust);
bool processNoteEnvelope(int note, int &instrumentValue);
int _sfxTimer;
int _sfxResource[3];
int _sfxPriority[3];
struct Channel {
int state;
const byte *currentOffset;
const byte *startOffset;
uint8 instrumentData[7];
} _channels[11];
uint8 _rndSeed;
uint8 getRnd();
struct Note {
int state;
int playTime;
int sustainTimer;
int instrumentValue;
int bias;
int preIncrease;
int adjust;
struct Envelope {
int stepIncrease;
int step;
int stepCounter;
int timer;
} envelope;
} _notes[22];
static const uint _noteBiasTable[7];
static const uint _numStepsTable[16];
static const uint _noteAdjustScaleTable[7];
static const uint _noteAdjustTable[16];
static const bool _useOperatorTable[7];
static const uint _channelOffsetTable[11];
static const uint _channelOperatorOffsetTable[7];
static const uint _baseRegisterTable[7];
static const uint _registerMaskTable[7];
static const uint _registerShiftTable[7];
};
} // End of namespace Scumm
#endif
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