(svn r26538) -Codechange: remove double accounting of the drivers

src/music/extmidi.cpp

@@ -37,8 +37,8 @@ static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
 
 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
 {
-	if (strcmp(_video_driver->GetName(), "allegro") == 0 ||
-			strcmp(_sound_driver->GetName(), "allegro") == 0) {
+	if (strcmp(VideoDriver::GetInstance()->GetName(), "allegro") == 0 ||
+			strcmp(SoundDriver::GetInstance()->GetName(), "allegro") == 0) {
 		return "the extmidi driver does not work when Allegro is loaded.";
 	}
 

src/music/music_driver.hpp

@@ -39,9 +39,15 @@ public:
 	 * @param vol The new volume.
 	 */
 	virtual void SetVolume(byte vol) = 0;
+
+	/**
+	 * Get the currently active instance of the music driver.
+	 */
+	static MusicDriver *GetInstance() {
+		return static_cast<MusicDriver*>(*DriverFactoryBase::GetActiveDriver(Driver::DT_MUSIC));
+	}
 };
 
-extern MusicDriver *_music_driver;
 extern char *_ini_musicdriver;
 
 #endif /* MUSIC_MUSIC_DRIVER_HPP */