Add song.ogg

pacat_advanced.cpp

@@ -17,6 +17,24 @@
 // https://github.com/pulseaudio/pulseaudio/blob/master/src/pulse/simple.c
 // https://habr.com/en/articles/663352/#linux-and-pulseaudio
 
+
+/// An abstract class that defines the SoundSubsystem which will be used by the higher-level ReMixer API.
+class SoundSubsystem
+{
+public:
+
+protected:
+private:
+
+};
+
+/// A PulseAudio implementation of the SoundSubsystem.
+class PulseAudioSubsystem : public SoundSubsystem
+{
+
+};
+
+/// The pa_system structure holds all the PulseAudio structures together
 struct pa_system
 {
     pa_threaded_mainloop* mainloop;