GR_SWIG_BLOCK_MAGIC(rad,wvfm_sink)

rad_wvfm_sink_sptr 
gr_make_wvfm_sink (size_t itemsize, const char *filename);

class rad_wvfm_sink : public gr_sync_block
{
 protected:
  rad_wvfm_sink (size_t itemsize, const char *filename);

 public:
  ~rad_wvfm_sink ();

  /*! 
   * \brief open filename and begin output to it.
   */
  bool open(const char *filename);

  /*!
   * \brief close current output file.
   */
  void close();
};