1 files changed, 178 insertions, 0 deletions
diff --git a/engines/scumm/imuse/drivers/mac_m68k.h b/engines/scumm/imuse/drivers/mac_m68k.h
new file mode 100644
index 0000000000..31beaf4e66
--- /dev/null
+++ b/engines/scumm/imuse/drivers/mac_m68k.h
@@ -0,0 +1,178 @@
+/* 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_IMUSE_MAC_M68K_H
+#define SCUMM_IMUSE_MAC_M68K_H
+
+#include "audio/softsynth/emumidi.h"
+
+#include "common/hashmap.h"
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Scumm {
+
+class MacM68kDriver : public MidiDriver_Emulated {
+	friend class MidiChannel_MacM68k;
+public:
+	MacM68kDriver(Audio::Mixer *mixer);
+	~MacM68kDriver();
+
+	virtual int open();
+	virtual void close();
+
+	virtual void send(uint32 d);
+	virtual void sysEx_customInstrument(byte channel, uint32 type, const byte *instr);
+
+	virtual MidiChannel *allocateChannel();
+	virtual MidiChannel *getPercussionChannel() { return 0; }
+
+	virtual bool isStereo() const { return false; }
+	virtual int getRate() const {
+		// The original is using a frequency of approx. 22254.54546 here.
+		// To be precise it uses the 16.16 fixed point value 0x56EE8BA3.
+		return 22254;
+	}
+
+protected:
+	virtual void generateSamples(int16 *buf, int len);
+	virtual void onTimer() {}
+
+private:
+	int *_mixBuffer;
+	int _mixBufferLength;
+
+	struct Instrument {
+		uint length;
+		uint sampleRate;
+		uint loopStart;
+		uint loopEnd;
+		int baseFrequency;
+
+		byte *data;
+	};
+
+	enum {
+		kDefaultInstrument = 0x3E7,
+		kProgramChangeBase = 0x3E8,
+		kSysExBase         = 0x7D0
+	};
+
+	Instrument getInstrument(int idx) const;
+	typedef Common::HashMap<int, Instrument> InstrumentMap;
+	InstrumentMap _instruments;
+	Instrument _defaultInstrument;
+	void loadAllInstruments();
+	void addInstrument(int idx, Common::SeekableReadStream *data);
+
+	struct OutputChannel {
+		int pitchModifier;
+
+		const byte *instrument;
+		uint subPos;
+
+		const byte *start;
+		const byte *end;
+
+		const byte *soundStart;
+		const byte *soundEnd;
+		const byte *loopStart;
+		const byte *loopEnd;
+
+		int frequency;
+		int volume;
+
+		bool isFinished;
+
+		int baseFrequency;
+	};
+
+	void setPitch(OutputChannel *out, int frequency);
+	int _pitchTable[128];
+
+	byte *_volumeTable;
+	static const int _volumeBaseTable[32];
+
+	class MidiChannel_MacM68k;
+
+	struct VoiceChannel {
+		MidiChannel_MacM68k *part;
+		VoiceChannel *prev, *next;
+		int channel;
+		int note;
+		bool sustainNoteOff;
+		OutputChannel out;
+
+		void off();
+	};
+
+	class MidiChannel_MacM68k : public MidiChannel {
+		friend class MacM68kDriver;
+	public:
+		virtual MidiDriver *device() { return _owner; }
+		virtual byte getNumber() { return _number; }
+		virtual void release();
+
+		virtual void send(uint32 b);
+		virtual void noteOff(byte note);
+		virtual void noteOn(byte note, byte velocity);
+		virtual void programChange(byte program);
+		virtual void pitchBend(int16 bend);
+		virtual void controlChange(byte control, byte value);
+		virtual void pitchBendFactor(byte value);
+		virtual void priority(byte value);
+		virtual void sysEx_customInstrument(uint32 type, const byte *instr);
+
+		void init(MacM68kDriver *owner, byte channel);
+		bool allocate();
+
+		void addVoice(VoiceChannel *voice);
+		void removeVoice(VoiceChannel *voice);
+	private:
+		MacM68kDriver *_owner;
+		bool _allocated;
+		int _number;
+
+		VoiceChannel *_voice;
+		int _priority;
+		int _sustain;
+		Instrument _instrument;
+		int _pitchBend;
+		int _pitchBendFactor;
+		int _volume;
+	};
+
+	MidiChannel_MacM68k _channels[32];
+
+	enum {
+		kChannelCount = 8
+	};
+	VoiceChannel _voiceChannels[kChannelCount];
+	int _lastUsedVoiceChannel;
+	VoiceChannel *allocateVoice(int priority);
+};
+
+} // End of namespace Scumm
+
+#endif