int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nShowCmd)

#define SOURCE_TYPE_GENERIC 0
#define SOURCE_TYPE_LOOP 1
#define SOURCE_TYPE_MIXING 2

class PCM_source
{
protected:
  PCM_source() { volume=1.0; pan=0.0; }
public:

  virtual ~PCM_source() { }

  virtual int GetType() { return SOURCE_TYPE_GENERIC; }
  virtual int GetSourceNCH()=0; // return number of channels
  virtual double GetLength() { return 0; } // return length in seconds

  virtual void GetSamples(double time_s, int samplerate, int length_samples, int nch, double *pcmout)=0;

  virtual int PropertiesWindow(HWND hwndParent) { return -1; }
  virtual void GetPeakInfo(double start_t, double end_t, double *channelpeaks, int nchpeaks) { }

  // (volume < 0 reverses phase)
  double volume, pan;
};