npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

node-record-lpcm16

v1.0.1

Published

Record a microphone input stream

Downloads

7,286

Readme

node-record-lpcm-16

Records a 16-bit signed-integer linear pulse modulation code WAV audio file.

This module uses Node.js streams to minimize memory usage and optimize speed, perfect for embedded devices and "the internet of things".

These audio files are fully compatible with both the Google Speech to Text API (v2) and the Wit.ai Speech API.

Installation

npm install node-record-lpcm16

Dependencies

Generally, running npm install should suffice.

This module requires you to install SoX and it must be available in your $PATH.

For Mac OS

brew install sox

For most linux disto's

sudo apt-get install sox libsox-fmt-all

For Windows

download the binaries

Options

sampleRate            : 16000  // audio sample rate
channels              : 1      // number of channels
threshold             : 0.5    // silence threshold (rec only)
endOnSilence          : false  // automatically end on silence (if supported)
thresholdStart        : null   // silence threshold to start recording, overrides threshold (rec only)
thresholdEnd          : null   // silence threshold to end recording, overrides threshold (rec only)
silence               : '1.0'  // seconds of silence before ending
recorder              : 'sox'  // Defaults to 'sox'
device                : null   // recording device (e.g.: 'plughw:1')
audioType             : 'wav'  // audio type to record

Please note that arecord might not work on all operating systems. If you can't capture any sound with arecord, try to change device (arecord -l).

Usage

const recorder = require('node-record-lpcm16')
const fs = require('fs')

const file = fs.createWriteStream('test.wav', { encoding: 'binary' })

recorder.record({
  sampleRate: 44100
})
.stream()
.pipe(file)

You can pause, resume and stop the recording manually.

const recorder = require('node-record-lpcm16')
const fs = require('fs')

const file = fs.createWriteStream('test.wav', { encoding: 'binary' })

const recording = recorder.record()
recording.stream().pipe(file)

// Pause recording after one second
setTimeout(() => {
  recording.pause()
}, 1000)

// Resume another second later
setTimeout(() => {
  recording.resume()
}, 2000)

// Stop recording after three seconds
setTimeout(() => {
  recording.stop()
}, 3000)

Recorders

The following recorders are included:

  • rec
  • sox
  • arecord

Note: not all recorders support all features!

Error handling

Some recorders might be logging errors to stderr and throw an exit code. You can catch early termination by adding an error event listener to the stream.

To debug the recorder see debugging below.

recording.stream()
  .on('error', err => {
    console.error('recorder threw an error:', err)
  })
  .pipe(file)

Debugging

Debug logging is implemented with visionmedia/debug

DEBUG=record node examples/file.js

Example

Here's how you can write your own Siri in just 10 lines of code.

const recorder = require('../')
const request = require('request')

const witToken = process.env.WIT_TOKEN // get one from wit.ai!

function parseResult (err, resp, body) {
  if (err) console.error(err)
  console.log(body)
}

const recording = recorder.record({
  recorder: 'arecord'
})

recording
  .stream()
  .pipe(request.post({
    'url': 'https://api.wit.ai/speech?client=chromium&lang=en-us&output=json',
    'headers': {
      'Accept': 'application/vnd.wit.20160202+json',
      'Authorization': `Bearer ${witToken}`,
      'Content-Type': 'audio/wav'
    }
  }, parseResult))

setTimeout(() => {
  recording.stop()
}, 3000) // Stop after three seconds of recording