SCUMM: Save/load Mac music engine state for Loom and MI1

Note that while this removes _townsPlayer->saveLoadWithSerializer(s)
it really shouldn't break anything because _musicEngine also points
to the FM Towns player. Famous last words...

engines/scumm/music.h

@@ -24,6 +24,7 @@
 #define SCUMM_MUSIC_H
 
 #include "common/scummsys.h"
+#include "engines/scumm/saveload.h"
 
 namespace Scumm {
 
@@ -78,6 +79,11 @@ class MusicEngine {
 	 * @return the music timer
 	 */
 	virtual int  getMusicTimer() { return 0; }
+
+	/**
+	 * Save or load the music state.
+	 */
+	virtual void saveLoadWithSerializer(Serializer *ser) {}
 };
 
 } // End of namespace Scumm

engines/scumm/player_mac.cpp

@@ -97,6 +97,48 @@ Player_Mac::~Player_Mac() {
 	delete[] _channel;
 }
 
+void Player_Mac::saveLoadWithSerializer(Serializer *ser) {
+	Common::StackLock lock(_mutex);
+	if (ser->getVersion() < VER(94)) {
+		if (_vm->_game.id == GID_MONKEY && ser->isLoading()) {
+			// TODO: Skip old iMUSE save/load information
+		}
+	} else {
+		static const SaveLoadEntry musicEntries[] = {
+			MKLINE(Player_Mac, _soundPlaying, sleInt16, VER(94)),
+			MKEND()
+		};
+
+		static const SaveLoadEntry channelEntries[] = {
+			MKLINE(Channel, _pos, sleUint16, VER(94)),
+			MKLINE(Channel, _pitchModifier, sleInt32, VER(94)),
+			MKLINE(Channel, _velocity, sleUint8, VER(94)),
+			MKLINE(Channel, _remaining, sleUint32, VER(94)),
+			MKLINE(Channel, _notesLeft, sleUint8, VER(94)),
+			MKEND()
+		};
+
+		static const SaveLoadEntry instrumentEntries[] = {
+			MKLINE(Instrument, _pos, sleUint32, VER(94)),
+			MKLINE(Instrument, _subPos, sleUint32, VER(94)),
+			MKEND()
+		};
+
+		ser->saveLoadEntries(this, musicEntries);
+
+		if (ser->isLoading() && _soundPlaying != -1) {
+			const byte *ptr = _vm->getResourceAddress(rtSound, _soundPlaying);
+			assert(ptr);
+			loadMusic(ptr);
+		}
+
+		ser->saveLoadArrayOf(_channel, _numberOfChannels, sizeof(Channel), channelEntries);
+		for (int i = 0; i < _numberOfChannels; i++) {
+			ser->saveLoadEntries(&_channel[i], instrumentEntries);
+		}
+	}
+}
+
 void Player_Mac::setMusicVolume(int vol) {
 	debug(5, "Player_Mac::setMusicVolume(%d)", vol);
 }

engines/scumm/player_mac.h

@@ -27,6 +27,7 @@
 #include "common/util.h"
 #include "common/mutex.h"
 #include "scumm/music.h"
+#include "scumm/saveload.h"
 #include "audio/audiostream.h"
 #include "audio/mixer.h"
 
@@ -62,6 +63,8 @@ class Player_Mac : public Audio::AudioStream, public MusicEngine {
 	virtual bool endOfData() const { return false; }
 	virtual int getRate() const { return _sampleRate; }
 
+	virtual void saveLoadWithSerializer(Serializer *ser);
+
 private:
 	Common::Mutex _mutex;
 	Audio::Mixer *const _mixer;

engines/scumm/saveload.cpp

@@ -1477,9 +1477,13 @@ void ScummEngine::saveOrLoad(Serializer *s) {
 	}
 
 
-	// Save/load FM-Towns audio status
-	if (_townsPlayer)
-		_townsPlayer->saveLoadWithSerializer(s);
+	//
+	// Save/load music engine status
+	//
+	if (_musicEngine) {
+		_musicEngine->saveLoadWithSerializer(s);
+	}
+
 
 	//
 	// Save/load the charset renderer state

engines/scumm/saveload.h

@@ -47,7 +47,7 @@ namespace Scumm {
  * only saves/loads those which are valid for the version of the savegame
  * which is being loaded/saved currently.
  */
-#define CURRENT_VER 93
+#define CURRENT_VER 94
 
 /**
  * An auxillary macro, used to specify savegame versions. We use this instead