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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_PLAYER_AD_H
+#define SCUMM_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();
+
+ OPL::OPL *_opl2;
+
+ int _samplesPerCallback;
+ int _samplesPerCallbackRemainder;
+ int _samplesTillCallback;
+ int _samplesTillCallbackRemainder;
+
+ int _soundPlaying;
+ int _engineMusicTimer;
+
+ // AdLib register utilities
+ uint8 _registerBackUpTable[256];
+ void writeReg(int r, int v);
+ uint8 readReg(int r) const;
+
+ // Instrument setup
+ void setupChannel(const uint channel, uint instrOffset) {
+ setupChannel(channel, _resource + instrOffset);
+ }
+ void setupChannel(const uint channel, const byte *instrOffset);
+ void setupOperator(const uint opr, const byte *&instrOffset);
+ static const int _operatorOffsetTable[18];
+
+ // Sound data
+ const byte *_resource;
+
+ // Music handling
+ void startMusic();
+ void updateMusic();
+ void noteOff(uint channel);
+ int findFreeChannel();
+ void setupFrequency(uint channel, int8 frequency);
+ void setupRhythm(uint rhythmInstr, uint instrOffset);
+
+ uint _timerLimit;
+ uint _musicTicks;
+ uint _musicTimer;
+ uint _internalMusicTimer;
+ bool _loopFlag;
+ uint _musicLoopStart;
+ uint _instrumentOffset[16];
+ uint _channelLastEvent[9];
+ uint _channelFrequency[9];
+ uint _channelB0Reg[9];
+
+ uint _mdvdrState;
+ uint _voiceChannels;
+
+ uint _curOffset;
+ uint _nextEventTimer;
+
+ static const uint _noteFrequencies[12];
+ static const uint _mdvdrTable[6];
+ static const uint _rhythmOperatorTable[6];
+ static const uint _rhythmChannelTable[6];
+
+ // SFX handling
+ void startSfx();
+ void updateSfx();
+ void clearChannel(int channel);
+ void updateChannel(int channel);
+ void parseSlot(int channel);
+ void updateSlot(int channel);
+ void parseNote(int channel, int num, const byte *offset);
+ bool processNote(int note, const byte *offset);
+ void noteOffOn(int channel);
+ void writeRegisterSpecial(int note, uint8 value, int offset);
+ uint8 readRegisterSpecial(int note, uint8 defaultValue, int offset);
+ void setupNoteEnvelopeState(int note, int steps, int adjust);
+ bool processNoteEnvelope(int note, int &instrumentValue);
+
+ int _sfxTimer;
+
+ int _sfxResource[3];
+ int _sfxPriority[3];
+
+ struct Channel {
+ int state;
+ const byte *currentOffset;
+ const byte *startOffset;
+ uint8 instrumentData[7];
+ } _channels[11];
+
+ uint8 _rndSeed;
+ uint8 getRnd();
+
+ 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;
+ } _notes[22];
+
+ 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