Detects the BPM of a song or audio sample
This module uses the Web Audio API to try and detect the BPM of a given sound. You can find more on the implementation and how it works by reading the blog post Beat Detection Using JavaScript and the Web Audio API which happens to be where I got most of the code.
$ npm install --save bpm-detectiveThe module exports one function. The function takes an AudioBuffer as its only argument. It returns the detected BPM. If the sample was too short or if, for any other reason, the detection failed, the method throws an error.
import detect from 'bpm-detective'
const AudioContext = window.AudioContext || window.webkitAudioContext
const context = new AudioContext()
// Fetch some audio file
fetch('some/audio/file.wav').then(async function (response) {
// Get response as ArrayBuffer
const buffer = await response.arrayBuffer()
// Decode audio into an AudioBuffer
const data = await new Promise(function (resolve, reject) {
context.decodeAudioData(buffer, resolve, reject)
});
// Run detection
const bpm = detect(data)
alert(`Detected BPM: ${bpm}`)
}).catch(console.error)The detection presumes you are working with dance(-ish) kind of music and as so looks only in the 90-180 BPM spectrum.
MIT