crossfade
v1.0.0
Published
Simple cross fader between two AudioNodes for WebAudio.
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Readme
crossfade
Simple cross fader between two AudioNodes for WebAudio.
Usage
- Example usage
npm install crossfader
var crossfader = require('crossfader');
var c = crossfader(context, node1, node2);
c.connect(context.destination);
document.getElementById('slider').addEventListener('input', function(){
c.fade.value = parseFloat(this.value);
});
API
Constructor
eg : var c = crossfader(context, node1, node2);
context
: AudioContext - The AudioContext within which the AudioNodes have been created.node1
: AudioNode - Any AudioNode within the AudioContext. Will be assigned to the negative value of thefade
property.node2
: AudioNode - Any AudioNode within the AudioContext. Will be assigned to the negative value of thefade
property.
Methods
connect
: Connect the crossfade Node to other AudioNodes. eg :c.connect(context.destination);
- arguments :
destination
: AudioNode - The AudioNode to connect the output of the crossfader to.
- arguments :
disconnect
: Disconnect the crossfade Node from other AudioNodes. eg :c.disconnect();
- supports the same arguments as disconnect method on AudioNodes
Properties
fade
: AudioParam - A value in the range [-1,1] that defines how much to cross fade betweennode1
andnode2
.eg:
c.fade.value = 0.5; //Cross fade position with equal volume from both AudioNodes c.fade.linearRampToValueAtTime(1, context.currentTime + 5); // Automation
fade
property is an AudioParam and supports all AudioParam automation methods.A
fade
value of -1 implies 100% volume on node1, and 0% volume on node2, while afade
value of 1 implies 0% volume on node1, and 100% volume on node2.The mapping between the value of fade and the volume follows the equal power curve.
Credits
Thanks to tambien for the his idea of using a generator + shaper to create a-rate, first class, custom AudioParams (like fade
in this case).
License
MIT
See License file