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audio/adlib_ctmidi.h

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef AUDIO_ADLIB_CTMIDI_H
+#define AUDIO_ADLIB_CTMIDI_H
+
+#include "audio/adlib_ms.h"
+
+/**
+ * General MIDI AdLib driver based on CTMIDI.DRV version 1.04
+ */
+class MidiDriver_ADLIB_CTMIDI : public MidiDriver_ADLIB_Multisource {
+public:
+	// Instrument bank from CTMIDI.DRV. Transpose is stored separately.
+	static const AdLibIbkInstrumentDefinition CTMIDI_INSTRUMENT_BANK[128];
+	// Instrument transpose parameter values
+	static const int8 INSTRUMENT_TRANSPOSE[128];
+
+	// Rhythm bank from CTMIDI.DRV. OPL note is stored separately.
+	static const AdLibIbkInstrumentDefinition CTMIDI_RHYTHM_BANK[47];
+	// Mapping from MIDI note value to rhythm instrument
+	static const uint8 RHYTHM_NOTE_INSTRUMENT_MAP[47];
+	// The OPL note to play for each rhythm instrument
+	static const uint8 RHYTHM_NOTES[47];
+
+	// F-num lookup table from CTMIDI.DRV
+	static const uint16 CTMIDI_NOTE_FREQUENCIES[768];
+	// Volume modifier lookup table
+	static const int8 NOTE_VOLUME_MODIFIER_VALUES[18];
+
+	MidiDriver_ADLIB_CTMIDI(OPL::Config::OplType oplType, int timerFrequency = OPL::OPL::kDefaultCallbackFrequency);
+	~MidiDriver_ADLIB_CTMIDI() { };
+
+	int open() override;
+	void deinitSource(uint8 source) override;
+
+protected:
+	// Instrument bank after conversion
+	OplInstrumentDefinition _ctmidiInstrumentBank[128];
+	// Rhythm bank after conversion
+	OplInstrumentDefinition _ctmidiRhythmBank[47];
+
+	/**
+	 * Sets the block / F-num registers for the rhythm instruments to default
+	 * values.
+	 */
+	void initRhythmDefaults();
+	void programChange(uint8 channel, uint8 program, uint8 source) override;
+	uint8 allocateOplChannel(uint8 channel, uint8 source, InstrumentInfo &instrumentInfo) override;
+	void writeFrequency(uint8 oplChannel, OplInstrumentRhythmType rhythmType) override;
+	uint16 calculateFrequency(uint8 channel, uint8 source, uint8 note) override;
+	uint8 calculateUnscaledVolume(uint8 channel, uint8 source, uint8 velocity, const OplInstrumentDefinition &instrumentDef, uint8 operatorNum) override;
+};
+
+#endif