AUDIO: Change several fake MidiDrivers to MidiDriver_BASE subclasses

Many engines follow the advice in audio/midiparser.h and create a
"pseudo-MidiDriver" subclass. But MidiParser really only needs a tiny
subset of the MidiDriver capabilities, namely those found in
MidiDriver_BASE. So we try to subclass from that whenever possible; this
allows us to remove many stub methods, and enables further future
simplifications.

2 files changed, 3 insertions, 15 deletions

diff --git a/engines/made/music.cpp b/engines/made/music.cpp
index 5ace99788b..acb37bc951 100644
--- a/engines/made/music.cpp
+++ b/engines/made/music.cpp
@@ -89,10 +89,6 @@ int MusicPlayer::open() {
 	return 0;
 }
 
-bool MusicPlayer::isOpen() const {
-	return _driver && _driver->isOpen();
-}
-
 void MusicPlayer::close() {
 	stop();
 	if (_driver) {
@@ -169,7 +165,7 @@ void MusicPlayer::playXMIDI(GenericResource *midiResource, MusicFlags flags) {
 		MidiParser *parser = _xmidiParser;
 		parser->setTrack(0);
 		parser->setMidiDriver(this);
-		parser->setTimerRate(getBaseTempo());
+		parser->setTimerRate(_driver->getBaseTempo());
 		parser->property(MidiParser::mpCenterPitchWheelOnUnload, 1);
 		parser->property(MidiParser::mpSendSustainOffOnNotesOff, 1);
 
@@ -196,7 +192,7 @@ void MusicPlayer::playSMF(GenericResource *midiResource, MusicFlags flags) {
 		MidiParser *parser = _smfParser;
 		parser->setTrack(0);
 		parser->setMidiDriver(this);
-		parser->setTimerRate(getBaseTempo());
+		parser->setTimerRate(_driver->getBaseTempo());
 		parser->property(MidiParser::mpCenterPitchWheelOnUnload, 1);
 
 		_parser = parser;
diff --git a/engines/made/music.h b/engines/made/music.h
index 024588ea4d..6bd4da470e 100644
--- a/engines/made/music.h
+++ b/engines/made/music.h
@@ -41,7 +41,7 @@ enum MusicFlags {
 	MUSIC_LOOP = 1
 };
 
-class MusicPlayer : public MidiDriver {
+class MusicPlayer : public MidiDriver_BASE {
 public:
 	MusicPlayer(MidiDriver *driver);
 	~MusicPlayer();
@@ -66,19 +66,11 @@ public:
 
 	//MidiDriver interface implementation
 	int open();
-	bool isOpen() const;
 	void close();
 	void send(uint32 b);
 
 	void metaEvent(byte type, byte *data, uint16 length);
 
-	void setTimerCallback(void *timerParam, void (*timerProc)(void *)) { }
-	uint32 getBaseTempo()	{ return _driver ? _driver->getBaseTempo() : 0; }
-
-	//Channel allocation functions
-	MidiChannel *allocateChannel()		{ return 0; }
-	MidiChannel *getPercussionChannel()	{ return 0; }
-
 	MidiParser *_parser;
 	Common::Mutex _mutex;