Further midi file support.

src/audio/midi/MetaMidiEvent.h

@@ -1,26 +1,49 @@
 #pragma once
 
-#include <string>
-
 #include "MidiEvent.h"
+#include <memory>
+#include <string>
 
 class MetaMidiEvent : public MidiEvent
 {
 public:
-	enum class Type
-	{
-		UNSET,
-		TRACK_NAME
-	};
+    enum class Type
+    {
+        UNSET,
+        TRACK_NAME,
+        SET_TEMPO,
+        TIME_SIGNATURE
+    };
 
-	Type mType = Type::UNSET;
-	std::string mLabel;
-	MetaMidiEvent();
+private:
 
-	static bool IsTrackName(char c)
-	{
-		return (c & META_TRACK_NAME) == META_TRACK_NAME;
-	}
+    static const int META_SET_TEMPO = 0x51; // 0101 0001
+    static const int META_TRACK_NAME = 0x3; // 0000 0011
+    static const int META_TIME_SIG = 0x58; // 0101 1000
+    Type mType;
+    std::string mLabel;
+    int mValue;
 
-	static const int META_TRACK_NAME = 0x3; // 0000 0011
+public:
+
+    MetaMidiEvent();
+    static std::shared_ptr<MetaMidiEvent> Create();
+
+    void SetValue(int value);
+
+    void SetIsTrackName();
+
+    void SetIsSetTempo();
+
+    void SetIsTimeSignature();
+
+    void SetLabel(const std::string& label);
+
+    static bool IsTrackName(char c);
+
+    static bool IsSetTempo(char c);
+
+    static bool IsTimeSignature(char c);
 };
+
+using MetaMidiEventPtr = std::shared_ptr<MetaMidiEvent>;