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#include "EXTERN.h"
#include "perl.h"
...
  void *buf
  int len
  int *n_read

TYPEMAP

...
uint16_t            T_U_SHORT
uint32_t *          T_U_SHORT
uint32_t            T_U_SHORT

#ifndef __RTL_SDR_H
#define __RTL_SDR_H
...
                    uint32_t tuner_freq);