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audio/adlib_hmisos.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_HMISOS_H
+#define AUDIO_ADLIB_HMISOS_H
+
+#include "audio/adlib_ms.h"
+
+#include "common/stream.h"
+
+/**
+ * General MIDI AdLib driver based on HMI Sound Operating System version dated 1994-11-27
+ * (as used by The Riddle Of Master Lu).
+ *
+ * Currently, only instrument bank loading is implemented.
+ * TODO:
+ * - Frequency calculation
+ * - Level calculation
+ * - Channel allocation
+ * - Controller 0x66 (pitch bend range)
+ */
+class MidiDriver_ADLIB_HMISOS : public MidiDriver_ADLIB_Multisource {
+public:
+	static const byte INSTRUMENT_BANK_SIGNATURE[8];
+
+	MidiDriver_ADLIB_HMISOS(OPL::Config::OplType oplType, int timerFrequency = OPL::OPL::kDefaultCallbackFrequency);
+	~MidiDriver_ADLIB_HMISOS() {};
+
+	int open() override;
+	bool loadInstrumentBanks(Common::SeekableReadStream *instrumentBankStream, Common::SeekableReadStream *rhythmBankStream = nullptr);
+
+protected:
+	int loadInstrumentBank(Common::SeekableReadStream *instrumentBankStream, bool rhythmBank);
+
+	OplInstrumentDefinition _sosInstrumentBank[128];
+	OplInstrumentDefinition _sosRhythmBank[128];
+};
+
+#endif