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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_PLAYERS_PLAYER_AD_H
#define SCUMM_PLAYERS_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();
int _musicVolume;
int _sfxVolume;
OPL::OPL *_opl2;
int _samplesPerCallback;
int _samplesPerCallbackRemainder;
int _samplesTillCallback;
int _samplesTillCallbackRemainder;
int _soundPlaying;
int32 _engineMusicTimer;
struct SfxSlot;
struct HardwareChannel {
bool allocated;
int priority;
SfxSlot *sfxOwner;
} _hwChannels[9];
int _numHWChannels;
static const int _operatorOffsetToChannel[22];
int allocateHWChannel(int priority, SfxSlot *owner = nullptr);
void freeHWChannel(int channel);
void limitHWChannels(int newCount);
// AdLib register utilities
uint8 _registerBackUpTable[256];
void writeReg(int r, int v);
uint8 readReg(int r) const;
// Instrument setup
void setupChannel(const uint channel, const byte *instrOffset);
void setupOperator(const uint opr, const byte *&instrOffset);
static const int _operatorOffsetTable[18];
// Music handling
void startMusic();
void stopMusic();
void updateMusic();
bool parseCommand();
uint parseVLQ();
void noteOff(uint channel);
void setupFrequency(uint channel, int8 frequency);
void setupRhythm(uint rhythmInstr, uint instrOffset);
const byte *_musicData;
uint _timerLimit;
uint _musicTicks;
uint32 _musicTimer;
uint32 _internalMusicTimer;
bool _loopFlag;
uint _musicLoopStart;
uint _instrumentOffset[16];
struct VoiceChannel {
uint lastEvent;
uint frequency;
uint b0Reg;
} _voiceChannels[9];
void freeVoiceChannel(uint channel);
void musicSeekTo(const uint position);
bool _isSeeking;
uint _mdvdrState;
uint32 _curOffset;
uint32 _nextEventTimer;
static const uint _noteFrequencies[12];
static const uint _mdvdrTable[6];
static const uint _rhythmOperatorTable[6];
static const uint _rhythmChannelTable[6];
// SFX handling
enum {
kNoteStatePreInit = -1,
kNoteStateAttack = 0,
kNoteStateDecay = 1,
kNoteStateSustain = 2,
kNoteStateRelease = 3,
kNoteStateOff = 4
};
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;
};
enum {
kChannelStateOff = 0,
kChannelStateParse = 1,
kChannelStatePlay = 2
};
struct Channel {
int state;
const byte *currentOffset;
const byte *startOffset;
uint8 instrumentData[7];
Note notes[2];
int hardwareChannel;
};
struct SfxSlot {
int resource;
int priority;
Channel channels[3];
} _sfx[3];
SfxSlot *allocateSfxSlot(int priority);
bool startSfx(SfxSlot *sfx, const byte *resource);
void stopSfx(SfxSlot *sfx);
void updateSfx();
void clearChannel(const Channel &channel);
void updateChannel(Channel *channel);
void parseSlot(Channel *channel);
void updateSlot(Channel *channel);
void parseNote(Note *note, const Channel &channel, const byte *offset);
bool processNote(Note *note, const Channel &channel, const byte *offset);
void noteOffOn(int channel);
void writeRegisterSpecial(int channel, uint8 value, int offset);
uint8 readRegisterSpecial(int channel, uint8 defaultValue, int offset);
void setupNoteEnvelopeState(Note *note, int steps, int adjust);
bool processNoteEnvelope(Note *note);
int _sfxTimer;
uint8 _rndSeed;
uint8 getRnd();
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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