1.16.0 • Published 6 months ago
tone-stream v1.16.0
tone-stream
Overview
A simple node.js tone stream library.
You can specify frequencies to be played by adding items in the format:
[NUMBER_OF_SAMPLES, FREQUENCY]
or DTMF tones:
[NUMBER_OF_SAMPLES, 'DTMF:ID']
You can add multiple of such tones and they will be enequeued and played in order.
Installation
npm i tone-stream
Sample usage
Playing some musical notes:
const { ToneStream } = require('tone-stream')
const Speaker = require('speaker')
const sampleRate = 8000
const format = {
sampleRate,
bitDepth: 16,
channels: 1
}
const ts = new ToneStream(format)
const s = new Speaker(format)
var ns = 0
ns += ts.add([1000, 261.63]) // C4
ns += ts.add([1000, 296.33]) // D4
ns += ts.add([1000, 329.63]) // E4
var duration = ns / sampleRate * 1000
ts.pipe(s)
setTimeout(() => {
console.log("done")
process.exit(0)
}, duration)
Playing some DTMF tones:
const { ToneStream } = require('tone-stream')
const Speaker = require('speaker')
const sampleRate = 8000
const format = {
sampleRate,
bitDepth: 16,
channels: 1
}
const ts = new ToneStream(format)
const s = new Speaker(format)
var ns = 0
ns += ts.add([1000, 'DTMF:1'])
ns += ts.add([500, 's'])
ns += ts.add([1000, 'DTMF:2'])
ns += ts.add([500, 's'])
ns += ts.add([1000, 'DTMF:3'])
ns += ts.add([500, 's'])
var duration = ns / sampleRate * 1000
ts.pipe(s)
setTimeout(() => {
console.log("done")
process.exit(0)
}, duration)
Using some helper functions to add miscelaneous tones
const { ToneStream, utils } = require('tone-stream')
const Speaker = require('speaker')
const _ = require('lodash')
const SAMPLE_RATE = 8000
const format = {
sampleRate: SAMPLE_RATE,
bitDepth: 16,
channels: 1
}
const ts = new ToneStream(format)
const s = new Speaker(format)
const tones = _.flatten([
utils.gen_dtmf_tones("1234567890abcdef", 100, 100, SAMPLE_RATE),
utils.gen_morse_tones("Be yourself; everyone else is already taken", 880, 70, SAMPLE_RATE),
utils.gen_music_scale("C5 D5 E5 F5 G5 A5 B5 C6", 100, 0, SAMPLE_RATE),
utils.gen_binary_tones_from_text("hello world", 5, 500, 2000, SAMPLE_RATE),
])
console.log("Inspecting tones:")
tones.forEach(tone => {
console.log(tone)
})
ts.concat(tones)
ts.on('empty', () => {
console.log("Got event 'empty'. Reversing tones and playing again.")
tones.reverse()
ts.concat(tones)
})
console.log("Starting playing tones")
ts.pipe(s)
Events
The stream emits events:
- 'empty': when there are no more tones to be played in the queue (it happens when the queue of tones is found empty)
- 'ended': when all tones in the queue were generated (it happens when the consumer tries to read data from the stream and there are no more tones to be generated)
More examples
See here.
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