SCUMM: Added support for Macintosh music in Monkey Island 1

This is based on the old Mac0-to-General MIDI conversion that we used
to do (and which this patch removes), as well as the code for playing
the Monkey Island 2 and Fate of Atlantis Macintosh music. I'm not sure
how accurate it is, particularly in tempo and volume, but at this
point it seems to work pretty well. Looping music is perhaps a bit
off, but it was before as well.

There is an annoying drawn out note in the music when you're following
the shopkeeper, but that appears to have been there in the original as
well.

1 files changed, 113 insertions, 0 deletions

diff --git a/engines/scumm/player_v5m.h b/engines/scumm/player_v5m.h
new file mode 100644
index 0000000000..c245554800
--- /dev/null
+++ b/engines/scumm/player_v5m.h
@@ -0,0 +1,113 @@
+/* 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_V5M_H
+#define SCUMM_PLAYER_V5M_H
+
+#include "common/scummsys.h"
+#include "common/util.h"
+#include "common/mutex.h"
+#include "scumm/music.h"
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+class Mixer;
+
+namespace Scumm {
+
+class ScummEngine;
+
+/**
+ * Scumm V5 Macintosh music driver.
+ */
+ class Player_V5M : public Audio::AudioStream, public MusicEngine {
+public:
+	Player_V5M(ScummEngine *scumm, Audio::Mixer *mixer);
+	virtual ~Player_V5M();
+
+	// 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;
+
+	// 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 _sampleRate; }
+
+private:
+	ScummEngine *const _vm;
+	Common::Mutex _mutex;
+	Audio::Mixer *const _mixer;
+	Audio::SoundHandle _soundHandle;
+	const uint32 _sampleRate;
+	int _soundPlaying;
+
+	void stopAllSounds_Internal();
+
+	struct Instrument {
+		byte *_data;
+		uint32 _size;
+		uint32 _rate;
+		uint32 _loopStart;
+		uint32 _loopEnd;
+		byte _baseFreq;
+
+		uint _pos;
+		uint _subPos;
+
+		void newNote() {
+			_pos = 0;
+			_subPos = 0;
+		}
+
+		void generateSamples(int16 *data, int pitchModifier, int volume, int numSamples);
+	};
+
+	struct Channel {
+		Instrument _instrument;
+		bool _looped;
+		uint32 _length;
+		const byte *_data;
+
+		uint _pos;
+		int _pitchModifier;
+		byte _velocity;
+		uint32 _remaining;
+
+		bool _notesLeft;
+
+		bool loadInstrument(Common::SeekableReadStream *stream);
+		bool getNextNote(uint16 &duration, byte &value, byte &velocity);
+ 	};
+
+	Channel _channel[3];
+	int _pitchTable[128];
+};
+
+} // End of namespace Scumm
+
+#endif