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

PortabilityLayer/HostAudioDriver.h

@@ -0,0 +1,18 @@
+#pragma once
+
+namespace PortabilityLayer
+{
+	class HostAudioChannel;
+
+	class HostAudioDriver
+	{
+	public:
+		virtual HostAudioChannel *CreateChannel() = 0;
+
+		static HostAudioDriver *GetInstance();
+		static void SetInstance(HostAudioDriver *instance);
+
+	private:
+		static HostAudioDriver *ms_instance;
+	};
+}