https://github.com/tornqvist/bpm-detective

Detects the BPM of a song or audio sample
https://github.com/tornqvist/bpm-detective

bpm javascript music

Last synced: 25 days ago
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Detects the BPM of a song or audio sample

• Host: GitHub
• URL: https://github.com/tornqvist/bpm-detective
• Owner: tornqvist
• Created: 2015-08-29T18:27:32.000Z (over 9 years ago)
• Default Branch: master
• Last Pushed: 2021-07-26T10:50:41.000Z (over 3 years ago)
• Last Synced: 2024-11-06T10:02:24.112Z (about 1 month ago)
• Topics: bpm, javascript, music
• Language: JavaScript
• Size: 13.7 MB
• Stars: 137
• Watchers: 4
• Forks: 15
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-webaudio - bpm-detective

README

        
# bpm-detective

> Detects the BPM of a song or audio sample

This module uses the [Web Audio API](https://developer.mozilla.org/en-US/docs/Web/API/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](http://joesul.li/van/beat-detection-using-web-audio/) which happens to be where I got most of the code.

## Install

```bash

$ npm install --save bpm-detective

```

## Usage

The module exports one function. The function takes an [AudioBuffer](https://developer.mozilla.org/en-US/docs/Web/API/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*.

```javascript

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)

```

### Disclaimer

The detection presumes you are working with dance(-ish) kind of music and as so looks only in the 90-180 BPM spectrum.

## License

MIT