More work. Audio driver works enough to play music now.

PortabilityLayer/HostAudioDriver.cpp

@@ -0,0 +1,16 @@
+#include "HostAudioDriver.h"
+
+namespace PortabilityLayer
+{
+	HostAudioDriver *HostAudioDriver::GetInstance()
+	{
+		return ms_instance;
+	}
+
+	void HostAudioDriver::SetInstance(HostAudioDriver *instance)
+	{
+		ms_instance = instance;
+	}
+
+	HostAudioDriver *HostAudioDriver::ms_instance;
+}