Record a microphone input stream
npm install @filip96/node-record-lpcm16npm install node-record-lpcm16
npm install should suffice.
$PATH.
brew install sox
sudo apt-get install sox libsox-fmt-all
choco install sox.portable
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
`javascript
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.
`javascript
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.
`javascript
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.
`javascript
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
``