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audio-param-transform
Advanced tools
Apply multiple transforms with custom functions to Web Audio API AudioParams.
Apply multiple transforms with custom functions to Web Audio API AudioParams.
$ npm install audio-param-transform
var extendTransform = require('audio-param-transform')
Pass in the AudioParam you wish to add a transform()
method to and the relevant AudioContext.
Returns the extended param.
Returns an instance of TransformAudioParam applied to the target AudioParam which works the same as the base AudioParam, except applying the specified func(a, b)
to all values, ramps and curves.
If you do not specify a function, the specified value for this transform will override all previous transforms (if any).
Creating a transpose param.
var extendTransform = require('audio-param-transform')
var audioContext = new webkitAudioContext()
var oscillator = audioContext.createOscillator()
oscillator.connect(audioContext.destination)
// create a base transform in case we want to automate the two independently
var baseFrequencyParam = oscillator.frequency.transform()
// now add the transpose transform
var transposeParam = oscillator.frequency.transform(transpose)
// modulate the transpose up an octave then down again each second
var on = false
setInterval(function(){
if (on){ // ramp up
transposeParam.linearRampToValueAtTime(12, audioContext.currentTime + 0.3)
} else { // and back again
transposeParam.linearRampToValueAtTime(0, audioContext.currentTime + 0.3)
}
on = !on
}, 1000)
function transpose(a,b){
return a * Math.pow(2, (b || 0) / 12)
}
FAQs
Apply multiple transforms with custom functions to Web Audio API AudioParams.
The npm package audio-param-transform receives a total of 3 weekly downloads. As such, audio-param-transform popularity was classified as not popular.
We found that audio-param-transform demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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