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Audio oscilloscope visualizer Web Component.

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x-oscilloscope

Audio oscilloscope visualizer Web Component

npm i x-oscilloscope pnpm add x-oscilloscope yarn add x-oscilloscope

Examples

# web

    Try it live

    # view source example/web.ts

    import { fetchAudioBuffer } from 'webaudio-tools'
    import { OscilloscopeElement } from 'x-oscilloscope'
    
    customElements.define('x-oscilloscope', OscilloscopeElement)
    document.body.innerHTML = `
    <div id="demo" style="display:inline-flex;height:80px;">
      <x-oscilloscope autoresize divider=4></x-oscilloscope>
    </div>
    `
    
    const ctx = new AudioContext({ sampleRate: 44100, latencyHint: 0.08 })
    
    const analyser = ctx.createAnalyser()
    analyser.fftSize = 8192
    analyser.smoothingTimeConstant = 0
    analyser.maxDecibels = 0
    analyser.minDecibels = -100
    
    // @ts-ignore
    const url = new URL('alpha_molecule.ogg', import.meta.url).toString()
    
    fetchAudioBuffer(ctx, url).then(audioBuffer => {
      const source = ctx.createBufferSource()
      source.buffer = audioBuffer
      source.loop = true
      source.connect(ctx.destination)
      source.start(0, 83)
      source.connect(analyser)
      ;(document.querySelector('x-oscilloscope') as OscilloscopeElement).analyser =
        analyser
    })
    
    window.onclick = () => ctx.state !== 'running' ? ctx.resume() : ctx.suspend()
    if (ctx.state !== 'running')
      document.body.appendChild(new Text('click to start/stop'))
    // requestAnimationFrame <- for shoty

API

# OscilloscopeElement src/x-oscilloscope.tsx#L10

Credits

  • sigl by stagas – Web framework
  • x-plot by stagas – A Web Component that plots zoomable and pannable waveforms.

Contributing

Fork or edit and submit a PR.

All contributions are welcome!

License

MIT © 2022 stagas