Further work on SPU implementation

src/core/host_interface.h

@@ -2,6 +2,8 @@
 #include "types.h"
 #include <memory>
 
+class AudioStream;
+
 namespace GL {
 class Texture;
 }
@@ -14,6 +16,8 @@ public:
   HostInterface();
   virtual ~HostInterface();
 
+  AudioStream* GetAudioStream() const { return m_audio_stream.get(); }
+
   bool InitializeSystem(const char* filename, const char* exp1_filename);
 
   virtual void SetDisplayTexture(GL::Texture* texture, u32 offset_x, u32 offset_y, u32 width, u32 height, float aspect_ratio) = 0;
@@ -26,6 +30,8 @@ public:
   bool SaveState(const char* filename);
 
 protected:
+  std::unique_ptr<AudioStream> m_audio_stream;
+
   std::unique_ptr<System> m_system;
   bool m_running = false;
 };