index.js

const rtlsdr = require("bindings")("rtlsdr.node");

module.exports = rtlsdr;

rtlsdr.TUNER_UNKNOWN = 0;
rtlsdr.TUNER_E4000 = 1;
rtlsdr.TUNER_FC0012 = 2;
rtlsdr.TUNER_FC0013 = 3;
rtlsdr.TUNER_FC2580 = 4;
rtlsdr.TUNER_R820T = 5;
rtlsdr.TUNER_R828D = 6;

/* eslint-disable camelcase */

const get_tuner_gains = rtlsdr.get_tuner_gains;
rtlsdr.get_tuner_gains = function(dev, gains) {
  const buf = Buffer.alloc(gains.length * 4); // TODO: int size is OS dependent
  const result = get_tuner_gains(dev, buf);
  for (let i = 0; i < gains.length; i++) {
    gains[i] = buf.readInt32LE(i * 4); // TODO: Endian is OS dependent
  }
  return result;
};

const read_sync = rtlsdr.read_sync;
rtlsdr.read_sync = function(dev, buf, len, n_read) {
  len = len || buf.length;
  n_read = n_read || Buffer.allocUnsafe(4); // TODO: int size is OS dependent
  const result = read_sync(dev, buf, len, n_read);
  if (result !== 0) {
    throw new Error("Unexpected return value from rtlsdr_read_syn: " + result);
  }
  return n_read.readInt32LE(n_read); // TODO: Endian is OS dependent
};