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/* ScummVM - Scumm Interpreter
* Copyright (C) 2001-2006 The ScummVM project
*
* YM2612 tone generation code written by Tomoaki Hayasaka.
* Used under the terms of the GNU General Public License.
* Adpated to ScummVM by Jamieson Christian.
*
* 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.
*
* $URL$
* $Id$
*/
#ifndef SOUND_SOFTSYNTH_Y2612_H
#define SOUND_SOFTSYNTH_Y2612_H
#include "common/stdafx.h"
#include "common/scummsys.h"
#include "sound/softsynth/emumidi.h"
////////////////////////////////////////
//
// Class declarations
//
////////////////////////////////////////
class Voice2612;
class Operator2612 {
protected:
Voice2612 *_owner;
enum State { _s_ready, _s_attacking, _s_decaying, _s_sustaining, _s_releasing };
State _state;
int32 _currentLevel;
int _frequency;
uint32 _phase;
int _lastOutput;
int _feedbackLevel;
int _detune;
int _multiple;
int32 _totalLevel;
int _keyScale;
int _velocity;
int _specifiedTotalLevel;
int _specifiedAttackRate;
int _specifiedDecayRate;
int _specifiedSustainLevel;
int _specifiedSustainRate;
int _specifiedReleaseRate;
int _tickCount;
int _attackTime;
int32 _decayRate;
int32 _sustainLevel;
int32 _sustainRate;
int32 _releaseRate;
public:
Operator2612 (Voice2612 *owner);
~Operator2612();
void feedbackLevel(int level);
void setInstrument(byte const *instrument);
void velocity(int velo);
void keyOn();
void keyOff();
void frequency(int freq);
void nextTick(const int *phaseShift, int *outbuf, int buflen);
bool inUse() { return (_state != _s_ready); }
};
class Voice2612 {
public:
Voice2612 *next;
uint16 _rate;
protected:
Operator2612 *_opr[4];
int _velocity;
int _control7;
int _note;
int _frequencyOffs;
int _frequency;
int _algorithm;
int *_buffer;
int _buflen;
public:
Voice2612();
~Voice2612();
void setControlParameter(int control, int value);
void setInstrument(byte const *instrument);
void velocity(int velo);
void nextTick(int *outbuf, int buflen);
void noteOn(int n, int onVelo);
bool noteOff(int note);
void pitchBend(int value);
void recalculateFrequency();
};
class MidiChannel_YM2612 : public MidiChannel {
protected:
uint16 _rate;
Voice2612 *_voices;
Voice2612 *_next_voice;
public:
void removeAllVoices();
void nextTick(int *outbuf, int buflen);
void rate(uint16 r);
public:
MidiChannel_YM2612();
virtual ~MidiChannel_YM2612();
// MidiChannel interface
MidiDriver *device() { return 0; }
byte getNumber() { return 0; }
void release() { }
void send(uint32 b) { }
void noteOff(byte note);
void noteOn(byte note, byte onVelo);
void programChange(byte program) { }
void pitchBend(int16 value);
void controlChange(byte control, byte value);
void pitchBendFactor(byte value) { }
void sysEx_customInstrument(uint32 type, const byte *instr);
};
class MidiDriver_YM2612 : public MidiDriver_Emulated {
protected:
MidiChannel_YM2612 *_channel[16];
int _next_voice;
int _volume;
protected:
void nextTick(int16 *buf1, int buflen);
int volume(int val = -1) { if (val >= 0) _volume = val; return _volume; }
void rate(uint16 r);
void generateSamples(int16 *buf, int len);
public:
MidiDriver_YM2612(Audio::Mixer *mixer);
virtual ~MidiDriver_YM2612();
static void createLookupTables();
static void removeLookupTables();
int open();
void close();
void send(uint32 b);
void send(byte channel, uint32 b); // Supports higher than channel 15
uint32 property(int prop, uint32 param) { return 0; }
void setPitchBendRange(byte channel, uint range) { }
void sysEx(const byte *msg, uint16 length);
MidiChannel *allocateChannel() { return 0; }
MidiChannel *getPercussionChannel() { return 0; }
// AudioStream API
bool isStereo() const { return true; }
int getRate() const { return _mixer->getOutputRate(); }
};
#endif
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