custom-audio-node

Create your own AudioNodes with AudioParams for using with the Web Audio API.

Install

$ npm install custom-audio-node

API

var createAudioNode = require('custom-audio-node')

createAudioNode(input, output, params)

Specify the input and output nodes to wrap into a single audio node.

params: automatable AudioParams

var extendTransform = require('audio-param-transform')
 
var audioContext = new AudioContext()
var input = audioContext.createBiquadFilter()
var output = audioContext.createGain()
 
// add the transform method
extendTransform(input.frequency, audioContext)
 
var decimalFrequencyParam = input.frequency.transform(valueToFreq)
 
input.connect(output)
 
function mapValueToFreq(defaultValue, value){
  var min = Math.log(100)/Math.log(10)
  var max = Math.log(20000)/Math.log(10)
  var range = max-min
  return Math.pow(10, value * range + min)
}
 
var customNode = createAudioNode(input, output, {
  amount: {
    min: 0, max: 1, defaultValue: 0.5,
    targets: [ decimalFrequencyParam ]
  }
})
 
customNode.connect(audioContext.destination)

TODO

• param.value should return the curve value at current time not the final value
• params currently cannot be connected to from another audioNode (modulate) e.g. node.connect(otherNode.frequency)