SCUMM/FM-TOWNS: start rewriting audio code

- Start rewriting audio code for FM-TOWNS versions of Loom, Indy3 and Monkey Island 1 using the recently added code in towns_audio.cpp (Zak should work the same way, but I can't test, since I don't own that one).
- All sound types (pcm, euphony and cd audio) now support volume and balance control (e.g. try walking into/out of the kitchen and opening/closing the door in the Scumm Bar in Monkey Island 1 or walking into/out of the circus tent).
- Pcm sounds now support proper loop start/end and note offsets (e.g. try out the hammer sound in the forge in LOOM for example).
- some other minor improvements
- The FM-Towns versions of Indy 4 and Monkey Island 2 are not affected. I don't have Monkey Island 2, but I presume that it will work like Indy 4. Adding support for these will be a separate task, since they work quite differently.

svn-id: r52198

1 files changed, 120 insertions, 0 deletions

diff --git a/engines/scumm/player_towns.h b/engines/scumm/player_towns.h
new file mode 100644
index 0000000000..6d87c93c09
--- /dev/null
+++ b/engines/scumm/player_towns.h
@@ -0,0 +1,120 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef SCUMM_PLAYER_TOWNS_H
+#define SCUMM_PLAYER_TOWNS_H
+
+#include "scumm/scumm.h"
+#include "scumm/music.h"
+#include "sound/softsynth/fmtowns_pc98/towns_euphony.h"
+
+namespace Scumm {
+
+class Player_Towns : public MusicEngine {
+public:
+	Player_Towns(ScummEngine *vm, Audio::Mixer *mixer);
+	virtual ~Player_Towns();
+
+	bool init();
+
+	void setMusicVolume(int vol);
+	void setSfxVolume(int vol);
+	void startSound(int sound);
+	void stopSound(int sound);
+	void stopAllSounds();
+
+	int getSoundStatus(int sound) const;
+	int getCurrentCdaSound() { return _cdaCurrentSound; } 
+	int getCurrentCdaVolume() { return (_cdaVolLeft + _cdaVolRight + 1) >> 1; } 
+
+	virtual int32 doCommand(int numargs, int args[]);
+
+	void setVolumeCD(int left, int right);
+	void setSoundVolume(int sound, int left, int right);
+	void setSoundNote(int sound, int note);
+
+	void saveLoadWithSerializer(Serializer *ser);
+	void restoreAfterLoad();
+
+	TownsEuphonyDriver *driver() { return _driver; }
+
+protected:
+	virtual int getNextFreePcmChannel(int sound, int sfxChanRelIndex);
+
+private:
+	void restartLoopingSounds();
+	void startSoundEx(int sound, int velo, int pan, int note);
+	void stopSoundSuspendLooping(int sound);
+
+	void playEuphonyTrack(int sound, const uint8 *data);
+	void playPcmTrack(int sound, const uint8 *data, int velo = 0, int pan = 64, int note = 0);
+	void playCdaTrack(int sound, const uint8 *data, bool skipTrackVelo = false);
+
+	void stopPcmTrack(int sound);
+
+	uint8 _cdaVolLeft;
+	uint8 _cdaVolRight;
+
+	struct SoundOvrParameters {
+		uint8 vLeft;
+		uint8 vRight;
+		uint8 note;
+	};
+
+	SoundOvrParameters *_soundOverride;
+	SoundOvrParameters _ovrCur;
+	
+	uint8 _unkFlags;
+
+	struct PcmCurrentSound {
+		uint16 index;
+		uint16 chan;
+		uint8 note;
+		uint8 velo;
+		uint8 pan;
+		uint8 paused;
+		uint8 looping;
+		uint32 priority;
+	} _pcmCurrentSound[9];
+
+	uint8 _eupCurrentSound;
+	uint8 _eupLooping;
+	uint8 _eupVolLeft;
+	uint8 _eupVolRight;
+
+	uint8 _cdaCurrentSound;
+	uint8 _cdaNumLoops;
+	uint8 _cdaForceRestart;
+
+	uint8 _cdaCurrentSoundTemp;
+	uint8 _cdaNumLoopsTemp;
+
+	TownsEuphonyDriver *_driver;
+	ScummEngine *_vm;
+};
+
+} // End of namespace Scumm
+
+#endif