Move MxMIDIManager to MxMusicManager (#178)

LEGO1/mxmusicmanager.h

@@ -1,11 +1,42 @@
 #ifndef MXMUSICMANAGER_H
 #define MXMUSICMANAGER_H
 
-#include "mxcore.h"
+#include "decomp.h"
+#include "mxaudiomanager.h"
 
 // VTABLE 0x100dc930
-class MxMusicManager : public MxCore
+// SIZE 0x58
+class MxMusicManager : public MxAudioManager
 {
+public:
+  MxMusicManager();
+  virtual ~MxMusicManager() override;
+
+  virtual void Destroy() override; // vtable+18
+  virtual void SetVolume(MxS32 p_volume) override; // vtable+2c
+  virtual MxResult StartMIDIThread(MxU32 p_frequencyMS, MxU8 p_noRegister); // vtable+30
+
+private:
+  void LockedReinitialize(MxBool p_skipDestroy);
+  void DeinitializeMIDI();
+
+  MxS32 CalculateVolume(MxS32 p_volume);
+  void SetMIDIVolume();
+
+  HMIDISTRM m_MIDIStreamH;  // 0x30
+  MxBool m_MIDIInitialized; // 0x34
+  undefined4 m_unk38;       // 0x38
+  undefined4 m_unk3c;       // 0x3c
+  undefined4 m_unk40;       // 0x40
+  undefined4 m_unk44;       // 0x44
+  undefined4 m_unk48;       // 0x48
+  MIDIHDR *m_MIDIHdrP;      // 0x4c
+  MxS32 m_multiplier;       // 0x50
+  DWORD m_MIDIVolume;       // 0x54
+
+protected:
+  void Init();
+  void InitData();
 };
 
-#endif // MXMUSICMANAGER_H
+#endif // MXMUSICMANAGER_H