changed structure of musicdriver, added General Midi music support.

mapping table mt32->gm needs a lot of changes.

svn-id: r7273

1 files changed, 83 insertions, 0 deletions

diff --git a/sky/musicbase.h b/sky/musicbase.h
new file mode 100644
index 0000000000..a01a41df78
--- /dev/null
+++ b/sky/musicbase.h
@@ -0,0 +1,83 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003 The ScummVM project
+ *
+ * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * $Header$
+ *
+ */
+
+#ifndef MUSICBASE_H
+#define MUSICBASE_H
+
+#include "stdafx.h"
+#include "common/engine.h"
+#include "disk.h"
+
+#define FILES_PER_SECTION 4
+
+typedef struct {
+	bool doReInit, doStopMusic;
+	uint8 musicToProcess;
+} Actions;
+
+class SkyChannelBase {
+public:
+	virtual void stopNote(void) = 0;
+	virtual uint8 process(uint16 aktTime) = 0;
+	virtual void updateVolume(uint16 pVolume) = 0;
+private:
+};
+
+class SkyMusicBase {
+public:
+	SkyMusicBase(SkyDisk *pSkyDisk);
+	~SkyMusicBase(void);
+	void loadSectionMusic(uint8 pSection);
+	void musicCommand(uint16 command);
+	void startMusic(uint16 param) { _onNextPoll.musicToProcess = param & 0xF; }; // 4
+	
+protected:
+	SkyDisk *_skyDisk;
+	uint8 *_musicData;
+	uint8 _allowedCommands;
+	uint16 _musicDataLoc;
+	uint16 _driverFileBase;
+
+	uint16 _musicVolume, _numberOfChannels;
+	uint8 _currentMusic;
+	uint8 _musicTempo0; // can be changed by music stream
+	uint8 _musicTempo1; // given once per music
+	uint32 _tempo;      // calculated from musicTempo0 and musicTempo1
+	uint32 _aktTime;
+	Actions _onNextPoll;
+	SkyChannelBase *_channels[10];
+	
+	virtual void setupPointers(void) = 0;
+	virtual void setupChannels(uint8 *channelData) = 0;
+
+	void updateTempo(void);
+	void loadNewMusic(void);
+	//-                           functions from CommandTable @0x90 (the main interface)
+	virtual void startDriver(void) = 0;                                          // 0
+	void StopDriver(void);                                                       // 1
+	void setTempo(uint16 newTempo);                                              // 2
+	void pollMusic();                                                            // 3
+	void reinitFM(void) { _onNextPoll.doReInit = true; };                        // 6
+	void stopMusic();                                                            // 7
+	void setFMVolume(uint16 param);                                              // 13
+};
+
+#endif //MUSICBASE_H