webaudio

API for Web Audio (JS)


Keywords
javascript, js, web, audio, sound, music
License
MIT
Install
nimble install webaudio

Documentation

Nim Wrapper for the Web Audio API

Example code for creating an oscillator that responds to clicks on the screen and fades and changes pitch over time.

Try it!

import webaudio
import dom

var ctx = newAudioContext()

var gain = ctx.createGain()
gain.gain.value = 0.5
gain.connect(ctx.destination)

var osc = ctx.createOscillator()
osc.type = "square"
osc.frequency.value = 440.0
osc.connect(gain)
osc.start()

var interval = window.setInterval(
  proc() =
    if gain.gain.value > 0.0:
      gain.gain.value = gain.gain.value - 0.01
      if gain.gain.value < 0.0:
        gain.gain.value = 0.0
  , 30)

var interval2 = window.setInterval(
  proc() =
    osc.frequency.value *= 0.5
    if osc.frequency.value < 20.0:
      gain.gain.value = 0.0
  , 60)

window.addEventListener("mousedown") do(e: Event):
  osc.frequency.value = 880.0
  gain.gain.value = 0.5