1 files changed, 156 insertions, 0 deletions
diff --git a/sound/softsynth/ym2612.h b/sound/softsynth/ym2612.h
new file mode 100644
index 0000000000..2831229903
--- /dev/null
+++ b/sound/softsynth/ym2612.h
@@ -0,0 +1,156 @@
+#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
+