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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 XEEN_SOUND_DRIVER_H
#define XEEN_SOUND_DRIVER_H
#include "audio/fmopl.h"
#include "audio/mixer.h"
#include "common/array.h"
#include "common/mutex.h"
#include "common/queue.h"
#include "common/stack.h"
#include "xeen/files.h"
#define CHANNEL_COUNT 9
namespace OPL {
class OPL;
}
namespace Xeen {
enum MusicCommand {
STOP_SONG = 0, RESTART_SONG = 1, SET_VOLUME = 0x100, GET_STATUS = 0xFFE0
};
class SoundDriver;
typedef bool (SoundDriver::*CommandFn)(const byte *&srcP, byte param);
/**
* Base class for sound drivers
*/
class SoundDriver {
protected:
struct Subroutine {
const byte *_returnP;
const byte *_jumpP;
Subroutine() : _returnP(nullptr), _jumpP(nullptr) {}
Subroutine(const byte *returnP, const byte *endP) :
_returnP(returnP), _jumpP(endP) {}
};
struct Channel {
bool _changeFrequency;
int _freqCtrChange;
int _freqChange;
int _freqCtr;
byte _volume;
byte _scalingValue;
uint _frequency;
Channel() : _changeFrequency(false), _freqCtr(0), _freqCtrChange(0),
_freqChange(0), _volume(0), _scalingValue(0), _frequency(0) {}
};
private:
static const CommandFn FX_COMMANDS[16];
static const CommandFn MUSIC_COMMANDS[16];
private:
Common::Stack<Subroutine> _musSubroutines, _fxSubroutines;
int _musCountdownTimer;
int _fxCountdownTimer;
const byte *_fxDataPtr, *_musDataPtr;
const byte *_fxStartPtr;
const byte *_musStartPtr;
uint _frameCtr;
private:
/**
* Executes the next command
* @param srcP Command data pointer
* @returns If true, execution of commands for the current timer call stops
*/
bool command(const byte *&srcP);
protected:
Common::Array<Channel> _channels;
bool _exclude7;
bool _musicPlaying;
bool _fxPlaying;
protected:
/**
* Executes a series of commands until instructed to stop
*/
void execute();
// Music commands (with some also used by FX)
virtual bool musCallSubroutine(const byte *&srcP, byte param);
virtual bool musSetCountdown(const byte *&srcP, byte param);
virtual bool musSetInstrument(const byte *&srcP, byte param) = 0;
virtual bool cmdNoOperation(const byte *&srcP, byte param);
virtual bool musSetPitchWheel(const byte *&srcP, byte param) = 0;
virtual bool musSkipWord(const byte *&srcP, byte param);
virtual bool musSetPanning(const byte *&srcP, byte param) = 0;
virtual bool musFade(const byte *&srcP, byte param) = 0;
virtual bool musStartNote(const byte *&srcP, byte param) = 0;
virtual bool musSetVolume(const byte *&srcP, byte param) = 0;
virtual bool musInjectMidi(const byte *&srcP, byte param) = 0;
virtual bool musPlayInstrument(const byte *&srcP, byte param) = 0;
virtual bool cmdFreezeFrequency(const byte *&srcP, byte param);
virtual bool cmdChangeFrequency(const byte *&srcP, byte param);
virtual bool musEndSubroutine(const byte *&srcP, byte param);
// FX commands
virtual bool fxCallSubroutine(const byte *&srcP, byte param);
virtual bool fxSetCountdown(const byte *&srcP, byte param);
virtual bool fxSetInstrument(const byte *&srcP, byte param) = 0;
virtual bool fxSetVolume(const byte *&srcP, byte param) = 0;
virtual bool fxMidiReset(const byte *&srcP, byte param) = 0;
virtual bool fxMidiDword(const byte *&srcP, byte param) = 0;
virtual bool fxSetPanning(const byte *&srcP, byte param) = 0;
virtual bool fxChannelOff(const byte *&srcP, byte param) = 0;
virtual bool fxFade(const byte *&srcP, byte param) = 0;
virtual bool fxStartNote(const byte *&srcP, byte param) = 0;
virtual bool fxInjectMidi(const byte *&srcP, byte param) = 0;
virtual bool fxPlayInstrument(const byte *&srcP, byte param) = 0;
virtual bool fxEndSubroutine(const byte *&srcP, byte param);
/**
* Post-processing done when a pause countdown starts or is in progress
*/
virtual void pausePostProcess() = 0;
/**
* Does a reset of any sound effect
*/
virtual void resetFX() = 0;
public:
/**
* Constructor
*/
SoundDriver();
/**
* Destructor
*/
virtual ~SoundDriver();
/**
* Starts an special effect playing
*/
virtual void playFX(uint effectId, const byte *data);
/**
* Stop any playing FX
*/
void stopFX();
/**
* Plays a song
*/
virtual void playSong(const byte *data);
/**
* Executes special music command
*/
virtual int songCommand(uint commandId, byte musicVolume = 0, byte sfxVolume = 0);
/**
* Returns whether music is currently playing
*/
bool isPlaying() const { return _musicPlaying; }
};
} // End of namespace Xeen
#endif /* XEEN_SOUND_DRIVER_H */
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