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908 lines
22 KiB
C++
908 lines
22 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2001-2004 The ScummVM project
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*
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* YM2612 tone generation code written by Tomoaki Hayasaka.
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* Used under the terms of the GNU General Public License.
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* Adpated to ScummVM by Jamieson Christian.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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#include "emumidi.h"
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#include <math.h>
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////////////////////////////////////////
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//
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// Miscellaneous
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//
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////////////////////////////////////////
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static int *sintbl = 0;
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static int *powtbl = 0;
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static int *frequencyTable = 0;
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static int *keycodeTable = 0;
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static int *keyscaleTable = 0;
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static int *attackOut = 0;
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////////////////////////////////////////
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//
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// Class declarations
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//
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////////////////////////////////////////
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class Operator2612;
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class Voice2612;
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class MidiChannel_YM2612;
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class MidiDriver_YM2612;
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class Operator2612 {
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protected:
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Voice2612 *_owner;
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enum State { _s_ready, _s_attacking, _s_decaying, _s_sustaining, _s_releasing };
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State _state;
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int32 _currentLevel;
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int _frequency;
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uint32 _phase;
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int _lastOutput;
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int _feedbackLevel;
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int _detune;
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int _multiple;
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int32 _totalLevel;
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int _keyScale;
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int _velocity;
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int _specifiedTotalLevel;
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int _specifiedAttackRate;
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int _specifiedDecayRate;
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int _specifiedSustainLevel;
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int _specifiedSustainRate;
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int _specifiedReleaseRate;
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int _tickCount;
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int _attackTime;
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int32 _decayRate;
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int32 _sustainLevel;
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int32 _sustainRate;
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int32 _releaseRate;
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public:
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Operator2612 (Voice2612 *owner);
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~Operator2612();
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void feedbackLevel(int level);
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void setInstrument(byte const *instrument);
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void velocity(int velo);
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void keyOn();
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void keyOff();
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void frequency(int freq);
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void nextTick(const int *phaseShift, int *outbuf, int buflen);
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bool inUse() { return (_state != _s_ready); }
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};
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class Voice2612 {
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public:
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Voice2612 *next;
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uint16 _rate;
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protected:
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Operator2612 *_opr[4];
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int _velocity;
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int _control7;
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int _note;
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int _frequencyOffs;
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int _frequency;
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int _algorithm;
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int *_buffer;
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int _buflen;
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public:
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Voice2612();
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~Voice2612();
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void setControlParameter(int control, int value);
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void setInstrument(byte const *instrument);
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void velocity(int velo);
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void nextTick(int *outbuf, int buflen);
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void noteOn(int n, int onVelo);
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bool noteOff(int note);
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void pitchBend(int value);
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void recalculateFrequency();
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};
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class MidiChannel_YM2612 : public MidiChannel {
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protected:
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uint16 _rate;
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Voice2612 *_voices;
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Voice2612 *_next_voice;
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public:
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void removeAllVoices();
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void nextTick(int *outbuf, int buflen);
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void rate(uint16 r);
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public:
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MidiChannel_YM2612();
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virtual ~MidiChannel_YM2612();
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// MidiChannel interface
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MidiDriver *device() { return 0; }
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byte getNumber() { return 0; }
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void release() { }
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void send(uint32 b) { }
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void noteOff(byte note);
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void noteOn(byte note, byte onVelo);
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void programChange(byte program) { }
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void pitchBend(int16 value);
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void controlChange(byte control, byte value);
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void pitchBendFactor(byte value) { }
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void sysEx_customInstrument(uint32 type, byte *instr);
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};
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class MidiDriver_YM2612 : public MidiDriver_Emulated {
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protected:
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MidiChannel_YM2612 *_channel[16];
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int _next_voice;
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int _volume;
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protected:
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static void createLookupTables();
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void nextTick(int16 *buf1, int buflen);
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int volume(int val = -1) { if (val >= 0) _volume = val; return _volume; }
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void rate(uint16 r);
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void generate_samples(int16 *buf, int len);
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public:
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MidiDriver_YM2612(SoundMixer *mixer);
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virtual ~MidiDriver_YM2612();
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int open();
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void close();
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void send(uint32 b);
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void send(byte channel, uint32 b); // Supports higher than channel 15
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uint32 property(int prop, uint32 param) { return 0; }
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void setPitchBendRange(byte channel, uint range) { }
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void sysEx(byte *msg, uint16 length);
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MidiChannel *allocateChannel() { return 0; }
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MidiChannel *getPercussionChannel() { return 0; }
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// AudioStream API
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bool isStereo() const { return true; }
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int getRate() const { return _mixer->getOutputRate(); }
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};
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////////////////////////////////////////
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//
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// Operator2612 implementation
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//
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////////////////////////////////////////
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Operator2612::Operator2612 (Voice2612 *owner) :
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_owner (owner),
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_state (_s_ready),
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_currentLevel ((int32)0x7f << 15),
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_phase (0),
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_lastOutput (0),
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_feedbackLevel (0),
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_detune (0),
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_multiple (1),
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_keyScale (0),
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_specifiedTotalLevel (127),
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_specifiedAttackRate (0),
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_specifiedDecayRate (0),
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_specifiedSustainRate (0),
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_specifiedReleaseRate (15) {
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velocity(0);
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}
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Operator2612::~Operator2612()
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{ }
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void Operator2612::velocity(int velo) {
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_velocity = velo;
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_totalLevel = ((int32)_specifiedTotalLevel << 15) +
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((int32)(127-_velocity) << 13);
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_sustainLevel = ((int32)_specifiedSustainLevel << 17);
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}
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void Operator2612::feedbackLevel(int level) {
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_feedbackLevel = level;
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}
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void Operator2612::setInstrument(byte const *instrument) {
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_detune = (instrument[8] >> 4) & 7;
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_multiple = instrument[8] & 15;
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_specifiedTotalLevel = instrument[12] & 127;
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_keyScale = (instrument[16] >> 6) & 3;
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_specifiedAttackRate = instrument[16] & 31;
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_specifiedDecayRate = instrument[20] & 31;
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_specifiedSustainRate = instrument[24] & 31;
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_specifiedSustainLevel = (instrument[28] >> 4) & 15;
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_specifiedReleaseRate = instrument[28] & 15;
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_state = _s_ready; // <20><>ʪ<EFBFBD>ǤϤɤ<CFA4><C9A4>ʤΤ<CAA4><CEA4><EFBFBD>?
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velocity(_velocity);
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}
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void Operator2612::keyOn() {
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_state = _s_attacking;
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_tickCount = 0;
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_phase = 0; // <20>ɤ<EFBFBD><C9A4>⡢<EFBFBD>ºݤ<C2BA><DDA4><EFBFBD><EFBFBD>餷<EFBFBD><E9A4B7>
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_currentLevel = ((int32)0x7f << 15); // <20><><EFBFBD><EFBFBD><EFBFBD>⡢<EFBFBD>ºݤ<C2BA><DDA4><EFBFBD><EFBFBD>餷<EFBFBD><E9A4B7>
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}
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void Operator2612::keyOff() {
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if (_state != _s_ready)
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_state = _s_releasing;
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}
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void Operator2612::frequency(int freq) {
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double value; // Use for intermediate computations to avoid int64 arithmetic
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int r;
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_frequency = freq / _owner->_rate;
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r = _specifiedAttackRate;
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if (r != 0) {
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r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
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if (r >= 64)
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r = 63; // <20><><EFBFBD><EFBFBD><EFBFBD>٤<EFBFBD><D9A4>ʤ<EFBFBD><CAA4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȥϻפ<CFBB><D7A4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (<28><>p.207)
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}
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r = 63 - r;
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if (_specifiedTotalLevel >= 128)
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value = 0;
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else {
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value = powtbl[(r&3) << 7];
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value *= 1 << (r >> 2);
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value *= 41; // r == 20 <20>ΤȤ<CEA4><C8A4><EFBFBD>0-96[db] <20><> 10.01[ms] == 41.00096
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value /= 1 << (15 + 5);
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value *= 127 - _specifiedTotalLevel;
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value /= 127;
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}
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_attackTime = (int32) value; // 1 <20><> == (1 << 12)
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if (_attackTime > 0)
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_attackTime = (1 << (12+10)) / (_owner->_rate * _attackTime);
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r = _specifiedDecayRate;
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if (r != 0) {
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r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
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if (r >= 64)
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r = 63;
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}
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value = (double) powtbl[(r&3) << 7] * (0x10 << (r>>2)) / 31;
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_decayRate = (int32) value / _owner->_rate;
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r = _specifiedSustainRate;
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if (r != 0) {
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r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
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if (r >= 64)
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r = 63;
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}
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value = (double) powtbl[(r&3) << 7] * (0x10 << (r>>2)) / 31;
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_sustainRate = (int32) value / _owner->_rate;
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r = _specifiedReleaseRate;
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if (r != 0) {
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r = r * 2 + 1; // (Translated) I cannot know whether the timing is a good choice or not
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r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
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// KS <20>ˤ<EFBFBD><CBA4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϥ<EFBFBD><CFA4><EFBFBD><EFBFBD>餷<EFBFBD><E9A4B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>p.206 <20>Ǥϵ<C7A4><CFB5>Ҥ<EFBFBD><D2A4><EFBFBD><EFBFBD>Ƥʤ<C6A4><CAA4><EFBFBD><EFBFBD>ɡ<EFBFBD>
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if (r >= 64)
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r = 63;
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}
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value = (double) powtbl[(r&3) << 7] * (0x10 << (r>>2)) / 31;
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_releaseRate = (int32) value / _owner->_rate;
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}
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void Operator2612::nextTick(const int *phasebuf, int *outbuf, int buflen) {
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if (_state == _s_ready)
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return;
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if (_state == _s_attacking && _attackTime <= 0) {
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_currentLevel = 0;
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_state = _s_decaying;
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}
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int32 levelIncrement = 0;
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int32 target = 0;
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State next_state = _s_ready;
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const int32 zero_level = ((int32)0x7f << 15);
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const int phaseIncrement = (_multiple > 0) ? (_frequency * _multiple) : (_frequency / 2);
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int32 output = _lastOutput;
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int32 level = _currentLevel + _totalLevel;
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while (buflen) {
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switch (_state) {
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case _s_ready:
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return;
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break;
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case _s_attacking:
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next_state = _s_attacking;
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break;
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case _s_decaying:
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levelIncrement = _decayRate;
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target = _sustainLevel + _totalLevel;
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next_state = _s_sustaining;
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break;
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case _s_sustaining:
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levelIncrement = _sustainRate;
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target = zero_level + _totalLevel;
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next_state = _s_ready;
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break;
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case _s_releasing:
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levelIncrement = _releaseRate;
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target = zero_level + _totalLevel;
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next_state = _s_ready;
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break;
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}
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bool switching = false;
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do {
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if (next_state == _s_attacking) {
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// Attack phase
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++_tickCount;
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int i = (int) (_tickCount * _attackTime);
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if (i >= 1024) {
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level = _totalLevel;
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_state = _s_decaying;
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switching = true;
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} else {
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level = (attackOut[i] << (31 - 8 - 16)) + _totalLevel;
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}
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} else {
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// Decay, Sustain and Release phases
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level += levelIncrement;
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if (level >= target) {
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level = target;
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_state = next_state;
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switching = true;
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}
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}
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if (level < zero_level) {
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int phaseShift = *phasebuf >> 2; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD>̤<EFBFBD>? 3 <20><><EFBFBD>㾮<EFBFBD><E3BEAE><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 2 <20><><EFBFBD><EFBFBD><EFBFBD>礭<EFBFBD><E7A4AD><EFBFBD>褦<EFBFBD>ʡ<EFBFBD>
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if (_feedbackLevel)
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phaseShift += (output << (_feedbackLevel - 1)) / 1024;
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output = sintbl[((_phase >> 7) + phaseShift) & 0x7ff];
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output >>= (level >> 18); // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̤<EFBFBD>?
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// Here is the original code, which requires 64-bit ints
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// output *= powtbl[511 - ((level>>25)&511)];
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// output >>= 16;
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// output >>= 1;
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// And here's our 32-bit trick for doing it. (Props to Fingolfin!)
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// Result varies from original code by max of 1.
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// int powVal = powtbl[511 - ((level>>9)&511)];
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// int outputHI = output / 256;
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// int powHI = powVal / 256;
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// output = (outputHI * powHI) / 2 + (outputHI * (powVal % 256) + powHI * (output % 256)) / 512;
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// And here's the even faster code.
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// Result varies from original code by max of 8.
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output = ((output >> 4) * (powtbl[511-((level>>9)&511)] >> 3)) / 1024;
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_phase += phaseIncrement;
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_phase &= 0x3ffff;
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} else
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output = 0;
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*outbuf += output;
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--buflen;
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++phasebuf;
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++outbuf;
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} while (buflen && !switching);
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}
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_lastOutput = output;
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_currentLevel = level - _totalLevel;
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}
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////////////////////////////////////////
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//
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// Voice2612 implementation
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//
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////////////////////////////////////////
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Voice2612::Voice2612() {
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next = 0;
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_control7 = 127;
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_note = 40;
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_frequency = 440;
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_frequencyOffs = 0x2000;
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_algorithm = 7;
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_buffer = 0;
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_buflen = 0;
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int i;
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for (i = 0; i < ARRAYSIZE(_opr); ++i)
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_opr[i] = new Operator2612 (this);
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velocity(0);
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}
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Voice2612::~Voice2612() {
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int i;
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for (i = 0; i < ARRAYSIZE(_opr); ++i)
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delete _opr[i];
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free(_buffer);
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}
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void Voice2612::velocity(int velo) {
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_velocity = velo;
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#if 0
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int v = (velo * _control7) >> 7; // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɤ<EFBFBD><C9A4>ʤ<EFBFBD><CAA4>Ǥ<EFBFBD><C7A4><EFBFBD>
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#else
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int v = velo + (_control7 - 127) * 4;
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#endif
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bool iscarrier[8][4] = {
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{ false, false, false, true, }, //0
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{ false, false, false, true, }, //1
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{ false, false, false, true, }, //2
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{ false, false, false, true, }, //3
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{ false, true, false, true, }, //4
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{ false, true, true, true, }, //5
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{ false, true, true, true, }, //6
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{ true, true, true, true, }, //7
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};
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int opr;
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for (opr = 0; opr < 4; opr++)
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if (iscarrier[_algorithm][opr])
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_opr[opr]->velocity(v);
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else
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_opr[opr]->velocity(127);
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}
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void Voice2612::setControlParameter(int control, int value) {
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switch (control) {
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case 7:
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_control7 = value;
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velocity(_velocity);
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break;
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case 123:
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// All notes off
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noteOff(_note);
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};
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}
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void Voice2612::setInstrument(byte const *instrument) {
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if (instrument == NULL)
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return;
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_algorithm = instrument[32] & 7;
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_opr[0]->feedbackLevel((instrument[32] >> 3) & 7);
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_opr[1]->feedbackLevel(0);
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_opr[2]->feedbackLevel(0);
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_opr[3]->feedbackLevel(0);
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_opr[0]->setInstrument(instrument + 0);
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_opr[1]->setInstrument(instrument + 2);
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_opr[2]->setInstrument(instrument + 1);
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_opr[3]->setInstrument(instrument + 3);
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}
|
||
|
||
void Voice2612::nextTick(int *outbuf, int buflen) {
|
||
if (_velocity == 0)
|
||
return;
|
||
|
||
if (_buflen < buflen) {
|
||
free(_buffer);
|
||
_buflen = buflen;
|
||
_buffer = (int *) malloc(sizeof(int) * buflen * 2);
|
||
}
|
||
|
||
int *buf1 = _buffer;
|
||
int *buf2 = _buffer + buflen;
|
||
memset(_buffer, 0, sizeof(int) * buflen * 2);
|
||
|
||
switch (_algorithm) {
|
||
case 0:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf2, buf1, buflen);
|
||
memset (buf2, 0, sizeof (int) * buflen);
|
||
_opr[2]->nextTick(buf1, buf2, buflen);
|
||
_opr[3]->nextTick(buf2, outbuf, buflen);
|
||
break;
|
||
case 1:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf1, buf2, buflen);
|
||
_opr[2]->nextTick(buf2, buf1, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
case 2:
|
||
_opr[1]->nextTick(buf1, buf2, buflen);
|
||
_opr[2]->nextTick(buf2, buf1, buflen);
|
||
memset(buf2, 0, sizeof(int) * buflen);
|
||
_opr[0]->nextTick(buf2, buf1, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
case 3:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf2, buf1, buflen);
|
||
memset(buf2, 0, sizeof(int) * buflen);
|
||
_opr[2]->nextTick(buf2, buf1, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
case 4:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf2, outbuf, buflen);
|
||
_opr[2]->nextTick(buf1, buf1, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
case 5:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf2, outbuf, buflen);
|
||
_opr[2]->nextTick(buf2, outbuf, buflen);
|
||
_opr[3]->nextTick(buf2, outbuf, buflen);
|
||
break;
|
||
case 6:
|
||
_opr[0]->nextTick(buf1, buf2, buflen);
|
||
_opr[1]->nextTick(buf2, outbuf, buflen);
|
||
_opr[2]->nextTick(buf1, outbuf, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
case 7:
|
||
_opr[0]->nextTick(buf1, outbuf, buflen);
|
||
_opr[1]->nextTick(buf1, outbuf, buflen);
|
||
_opr[2]->nextTick(buf1, outbuf, buflen);
|
||
_opr[3]->nextTick(buf1, outbuf, buflen);
|
||
break;
|
||
};
|
||
}
|
||
|
||
void Voice2612::noteOn(int n, int onVelo) {
|
||
_note = n;
|
||
velocity(onVelo);
|
||
recalculateFrequency();
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_opr); i++)
|
||
_opr[i]->keyOn();
|
||
}
|
||
|
||
bool Voice2612::noteOff(int note) {
|
||
if (_note != note)
|
||
return false;
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_opr); i++)
|
||
_opr[i]->keyOff();
|
||
return true;
|
||
}
|
||
|
||
void Voice2612::pitchBend(int value) {
|
||
_frequencyOffs = value;
|
||
recalculateFrequency();
|
||
}
|
||
|
||
void Voice2612::recalculateFrequency() {
|
||
// MIDI <20>Ȥ<EFBFBD><C8A4>㤦<EFBFBD><E3A4A6>....
|
||
// <20>ɤ<EFBFBD><C9A4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͤʤ<CDA4><CAA4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
|
||
// <20>Ȼפä<D7A4><C3A4>顢<EFBFBD>ʤ<EFBFBD><CAA4>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD> (<28><>) <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>餷<EFBFBD><E9A4B7><EFBFBD><EFBFBD>
|
||
int32 basefreq = frequencyTable[_note];
|
||
int cfreq = frequencyTable[_note - (_note % 12)];
|
||
int oct = _note / 12;
|
||
int fnum = (int) (((double)basefreq * (1 << 13)) / cfreq); // OPL <20><> fnum <20><>Ʊ<EFBFBD><C6B1><EFBFBD>褦<EFBFBD>ʤ<EFBFBD><CAA4>Ρ<EFBFBD>
|
||
fnum += _frequencyOffs - 0x2000;
|
||
if (fnum < 0x2000) {
|
||
fnum += 0x2000;
|
||
oct--;
|
||
}
|
||
if (fnum >= 0x4000) {
|
||
fnum -= 0x2000;
|
||
oct++;
|
||
}
|
||
|
||
// _frequency <20>Ϻǽ<CFBA>Ū<EFBFBD>˥Х<CBA5><D0A5><EFBFBD><EFBFBD><EFBFBD> 256*1024 <20><>
|
||
_frequency = (int) ((frequencyTable[oct*12] * (double)fnum) / 8);
|
||
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_opr); i++)
|
||
_opr[i]->frequency(_frequency);
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
//
|
||
// MidiChannel_YM2612
|
||
//
|
||
////////////////////////////////////////
|
||
|
||
MidiChannel_YM2612::MidiChannel_YM2612() {
|
||
_voices = 0;
|
||
_next_voice = 0;
|
||
}
|
||
|
||
MidiChannel_YM2612::~MidiChannel_YM2612() {
|
||
removeAllVoices();
|
||
}
|
||
|
||
void MidiChannel_YM2612::removeAllVoices() {
|
||
if (!_voices)
|
||
return;
|
||
Voice2612 *last, *voice = _voices;
|
||
for (; voice; voice = last) {
|
||
last = voice->next;
|
||
delete voice;
|
||
}
|
||
_voices = _next_voice = 0;
|
||
}
|
||
|
||
void MidiChannel_YM2612::noteOn(byte note, byte onVelo) {
|
||
if (!_voices)
|
||
return;
|
||
_next_voice = _next_voice ? _next_voice : _voices;
|
||
_next_voice->noteOn(note, onVelo);
|
||
_next_voice = _next_voice->next;
|
||
}
|
||
|
||
void MidiChannel_YM2612::noteOff(byte note) {
|
||
if (!_voices)
|
||
return;
|
||
if (_next_voice == _voices)
|
||
_next_voice = 0;
|
||
Voice2612 *voice = _next_voice;
|
||
do {
|
||
if (!voice)
|
||
voice = _voices;
|
||
if (voice->noteOff(note)) {
|
||
_next_voice = voice;
|
||
break;
|
||
}
|
||
voice = voice->next;
|
||
} while (voice != _next_voice);
|
||
}
|
||
|
||
void MidiChannel_YM2612::controlChange(byte control, byte value) {
|
||
// <20><><EFBFBD><EFBFBD><EFBFBD>Τ<EFBFBD><CEA4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
|
||
if (control == 121) {
|
||
// Reset controller
|
||
removeAllVoices();
|
||
} else {
|
||
Voice2612 *voice = _voices;
|
||
for (; voice; voice = voice->next)
|
||
voice->setControlParameter(control, value);
|
||
}
|
||
}
|
||
|
||
void MidiChannel_YM2612::sysEx_customInstrument(uint32 type, byte *fmInst) {
|
||
if (type != 'EUP ')
|
||
return;
|
||
Voice2612 *voice = new Voice2612;
|
||
voice->next = _voices;
|
||
_voices = voice;
|
||
voice->_rate = _rate;
|
||
voice->setInstrument(fmInst);
|
||
}
|
||
|
||
void MidiChannel_YM2612::pitchBend(int16 value) {
|
||
// <20><><EFBFBD><EFBFBD><EFBFBD>Τ<EFBFBD><CEA4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>?
|
||
Voice2612 *voice = _voices;
|
||
for (; voice; voice = voice->next)
|
||
voice->pitchBend(value);
|
||
}
|
||
|
||
void MidiChannel_YM2612::nextTick(int *outbuf, int buflen) {
|
||
Voice2612 *voice = _voices;
|
||
for (; voice; voice = voice->next)
|
||
voice->nextTick(outbuf, buflen);
|
||
}
|
||
|
||
void MidiChannel_YM2612::rate(uint16 r) {
|
||
_rate = r;
|
||
Voice2612 *voice = _voices;
|
||
for (; voice; voice = voice->next)
|
||
voice->_rate = r;
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
//
|
||
// MidiDriver_YM2612
|
||
//
|
||
////////////////////////////////////////
|
||
|
||
MidiDriver_YM2612::MidiDriver_YM2612(SoundMixer *mixer)
|
||
: MidiDriver_Emulated(mixer) {
|
||
_next_voice = 0;
|
||
|
||
createLookupTables();
|
||
_volume = 256;
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_channel); i++)
|
||
_channel[i] = new MidiChannel_YM2612;
|
||
rate(getRate());
|
||
}
|
||
|
||
MidiDriver_YM2612::~MidiDriver_YM2612() {
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_channel); i++)
|
||
delete _channel[i];
|
||
delete sintbl;
|
||
delete powtbl;
|
||
delete frequencyTable;
|
||
delete keycodeTable;
|
||
delete keyscaleTable;
|
||
delete attackOut;
|
||
sintbl = powtbl = frequencyTable = keycodeTable = keyscaleTable = attackOut = 0;
|
||
}
|
||
|
||
int MidiDriver_YM2612::open() {
|
||
if (_isOpen)
|
||
return MERR_ALREADY_OPEN;
|
||
|
||
MidiDriver_Emulated::open();
|
||
|
||
_mixer->setupPremix(this);
|
||
return 0;
|
||
}
|
||
|
||
void MidiDriver_YM2612::close() {
|
||
if (!_isOpen)
|
||
return;
|
||
_isOpen = false;
|
||
|
||
// Detach the premix callback handler
|
||
_mixer->setupPremix(0);
|
||
}
|
||
|
||
void MidiDriver_YM2612::send(uint32 b) {
|
||
send(b & 0xF, b & 0xFFFFFFF0);
|
||
}
|
||
|
||
void MidiDriver_YM2612::send(byte chan, uint32 b) {
|
||
//byte param3 = (byte) ((b >> 24) & 0xFF);
|
||
byte param2 = (byte) ((b >> 16) & 0xFF);
|
||
byte param1 = (byte) ((b >> 8) & 0xFF);
|
||
byte cmd = (byte) (b & 0xF0);
|
||
if (chan > ARRAYSIZE(_channel))
|
||
return;
|
||
|
||
switch (cmd) {
|
||
case 0x80:// Note Off
|
||
_channel[chan]->noteOff(param1);
|
||
break;
|
||
case 0x90: // Note On
|
||
_channel[chan]->noteOn(param1, param2);
|
||
break;
|
||
case 0xA0: // Aftertouch
|
||
break; // Not supported.
|
||
case 0xB0: // Control Change
|
||
_channel[chan]->controlChange(param1, param2);
|
||
break;
|
||
case 0xC0: // Program Change
|
||
_channel[chan]->programChange(param1);
|
||
break;
|
||
case 0xD0: // Channel Pressure
|
||
break; // Not supported.
|
||
case 0xE0: // Pitch Bend
|
||
_channel[chan]->pitchBend((param1 | (param2 << 7)) - 0x2000);
|
||
break;
|
||
case 0xF0: // SysEx
|
||
// We should never get here! SysEx information has to be
|
||
// sent via high-level semantic methods.
|
||
warning("MidiDriver_YM2612: Receiving SysEx command on a send() call");
|
||
break;
|
||
|
||
default:
|
||
warning("MidiDriver_YM2612: Unknown send() command 0x%02X", cmd);
|
||
}
|
||
}
|
||
|
||
void MidiDriver_YM2612::sysEx(byte *msg, uint16 length) {
|
||
if (msg[0] != 0x7C || msg[1] >= ARRAYSIZE(_channel))
|
||
return;
|
||
_channel[msg[1]]->sysEx_customInstrument('EUP ', &msg[2]);
|
||
}
|
||
|
||
void MidiDriver_YM2612::generate_samples(int16 *data, int len) {
|
||
memset(data, 0, 2 * sizeof(int16) * len);
|
||
nextTick(data, len);
|
||
}
|
||
|
||
void MidiDriver_YM2612::nextTick(int16 *buf1, int buflen) {
|
||
int *buf0 = (int *)buf1;
|
||
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_channel); i++)
|
||
_channel[i]->nextTick(buf0, buflen);
|
||
|
||
for (i = 0; i < buflen; ++i)
|
||
buf1[i*2+1] = buf1[i*2] = ((buf0[i] * volume()) >> 10) & 0xffff;
|
||
}
|
||
|
||
void MidiDriver_YM2612::rate(uint16 r)
|
||
{
|
||
int i;
|
||
for (i = 0; i < ARRAYSIZE(_channel); i++)
|
||
_channel[i]->rate(r);
|
||
}
|
||
|
||
void MidiDriver_YM2612::createLookupTables() {
|
||
{
|
||
int i;
|
||
sintbl = new int [2048];
|
||
for (i = 0; i < 2048; i++)
|
||
sintbl[i] = (int)(0xffff * sin(i/2048.0*2.0*PI));
|
||
}
|
||
|
||
{
|
||
int i;
|
||
powtbl = new int [1025];
|
||
for (i = 0; i <= 1024; i++)
|
||
powtbl[i] = (int)(0x10000 * pow(2.0, (i-512)/512.0));
|
||
}
|
||
|
||
{
|
||
int i;
|
||
int block;
|
||
|
||
static int fnum[] = {
|
||
0x026a, 0x028f, 0x02b6, 0x02df,
|
||
0x030b, 0x0339, 0x036a, 0x039e,
|
||
0x03d5, 0x0410, 0x044e, 0x048f,
|
||
};
|
||
|
||
// (int)(880.0 * 256.0 * pow(2.0, (note-0x51)/12.0)); // <20>Х<EFBFBD><D0A5><EFBFBD><EFBFBD><EFBFBD> 256 <20><>
|
||
// 0x45 <20><> 440Hz (a4)<29><>0x51 <20><> 880Hz (a5) <20>餷<EFBFBD><E9A4B7>
|
||
frequencyTable = new int [120];
|
||
for (block = -1; block < 9; block++) {
|
||
for (i = 0; i < 12; i++) {
|
||
double freq = fnum[i] * (166400.0 / 3) * pow(2.0, block-21);
|
||
frequencyTable[(block+1)*12+i] = (int)(256.0 * freq);
|
||
}
|
||
}
|
||
|
||
keycodeTable = new int [120];
|
||
// detune <20>̤η<CEB7><D7BB><EFBFBD> KS <20>ˤ<EFBFBD><CBA4><EFBFBD> rate <20>Ѵ<EFBFBD><D1B4>˻Ȥ<CBBB><C8A4><EFBFBD><F3A4B8A4>ʤ<EFBFBD><CAA4><EFBFBD><EFBFBD><EFBFBD>
|
||
for (block = -1; block < 9; block++) {
|
||
for (i = 0; i < 12; i++) {
|
||
// see p.204
|
||
int f8 = (fnum[i] >> 7) & 1;
|
||
int f9 = (fnum[i] >> 8) & 1;
|
||
int f10 = (fnum[i] >> 9) & 1;
|
||
int f11 = (fnum[i] >> 10) & 1;
|
||
int n4 = f11;
|
||
int n3 = f11&(f10|f9|f8) | (~f11&f10&f9&f8);
|
||
int note = n4*2 + n3;
|
||
// see p.207
|
||
keycodeTable[(block+1)*12+i] = block*4 + note;
|
||
}
|
||
}
|
||
}
|
||
|
||
{
|
||
int freq;
|
||
keyscaleTable = new int [8192];
|
||
keyscaleTable[0] = 0;
|
||
for (freq = 1; freq < 8192; freq++) {
|
||
keyscaleTable[freq] = (int)(log((double)freq) / 9.03 * 32.0) - 1;
|
||
// 8368[Hz] (o9c) <20><> 32<33><32><EFBFBD>餤<EFBFBD><E9A4A4>9.03 =:= ln 8368
|
||
}
|
||
}
|
||
|
||
{
|
||
int i;
|
||
attackOut = new int [1024];
|
||
for (i = 0; i < 1024; i++)
|
||
attackOut[i] = (int)(((0x7fff+0x03a5)*30.0) / (30.0+i)) - 0x03a5;
|
||
}
|
||
}
|
||
|
||
////////////////////////////////////////
|
||
//
|
||
// MidiDriver_YM2612 factory
|
||
//
|
||
////////////////////////////////////////
|
||
|
||
MidiDriver *MidiDriver_YM2612_create(SoundMixer *mixer) {
|
||
return new MidiDriver_YM2612(mixer);
|
||
}
|