expose a simpler interface for drivers

stepmania/src/RageSound.cpp

@@ -97,7 +97,8 @@ RageSound::~RageSound()
 	SOUNDMAN->lock.Unlock();
 }
 
-RageSound::RageSound(const RageSound &cpy)
+RageSound::RageSound(const RageSound &cpy):
+	RageDriverSound( cpy )
 {
 	ASSERT(SOUNDMAN);
 	LockMut(SOUNDMAN->lock);

stepmania/src/RageSound.h

@@ -7,7 +7,19 @@
 
 class SoundReader;
 
-class RageSound
+/* Driver interface for sounds: this is what drivers see. */
+class RageDriverSound
+{
+public:
+	virtual ~RageDriverSound() { }
+	virtual void StopPlaying() = 0;
+	virtual int GetPCM( char *buffer, int size, int sampleno ) = 0;
+	virtual int GetSampleRate() const = 0;
+	virtual RageTimer GetStartTime() const { return RageZeroTimer; }
+	virtual CString GetLoadedFilePath() const = 0;
+};
+
+class RageSound: public RageDriverSound
 {
 public:
 	/* M_STOP (default) stops the sound after m_LengthSamples have been played.