Get audio from built-in mic, ready to be processed.

mic.js

/**
 * Get audio from built-in mic, ready to be processed.
 * use rec output.wav if you want to just record audio.
 *
 * Usage: node mic.js
 * Prereq: brew install sox
 *
 * Note: to covert .raw output to .wav file:
 * sox -t raw -r 16000 -b 16 -c 1 -L -e signed-integer output.raw abbas.wav
 *
 * link: https://github.com/ashishbajaj99/mic
 */

var mic = require('mic');
var fs = require('fs');

var micInstance = mic({
    rate: '16000',
    channels: '1',
    debug: false,
    exitOnSilence: 6,
    fileType: 'wav',
});
var micInputStream = micInstance.getAudioStream();

var outputFileStream = fs.WriteStream('output.raw');

micInputStream.pipe(outputFileStream);

micInputStream.on('data', function (data) {
    console.log("Recieved Input Stream: ");
    console.log(data.length);
});

micInputStream.on('error', function (err) {
    console.log("Error in Input Stream: " + err);
});

micInputStream.on('startComplete', function () {
    console.log("Got SIGNAL startComplete");
    setTimeout(function () {
        micInstance.stop();
    }, 5000);
});

micInputStream.on('stopComplete', function () {
    console.log("Got SIGNAL stopComplete");
});

micInputStream.on('pauseComplete', function () {
    console.log("Got SIGNAL pauseComplete");
    setTimeout(function () {
        micInstance.resume();
    }, 5000);
});

micInputStream.on('resumeComplete', function () {
    console.log("Got SIGNAL resumeComplete");
    setTimeout(function () {
        micInstance.stop();
    }, 5000);
});

micInputStream.on('silence', function () {
    console.log("Got SIGNAL silence");
});

micInputStream.on('processExitComplete', function () {
    console.log("Got SIGNAL processExitComplete");
});

micInstance.start();