/
LinearCrossFade.js
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LinearCrossFade.js
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/*!
* @depends ../core/AudioletNode.js
*/
/**
* Linear cross-fade between two signals
*
* **Inputs**
*
* - Audio 1
* - Audio 2
* - Fade Position
*
* **Outputs**
*
* - Mixed audio
*
* **Parameters**
*
* - position The fade position. Values between 0 (Audio 1 only) and 1 (Audio
* 2 only). Linked to input 2.
*
* @constructor
* @extends AudioletNode
* @param {Audiolet} audiolet The audiolet object.
* @param {Number} [position=0.5] The initial fade position.
*/
var LinearCrossFade = function(audiolet, position) {
AudioletNode.call(this, audiolet, 3, 1);
this.linkNumberOfOutputChannels(0, 0);
this.position = new AudioletParameter(this, 2, position || 0.5);
};
extend(LinearCrossFade, AudioletNode);
/**
* Process a block of samples
*/
LinearCrossFade.prototype.generate = function() {
var inputA = this.inputs[0];
var inputB = this.inputs[1];
var output = this.outputs[0];
var position = this.position.getValue();
var gainA = 1 - position;
var gainB = position;
var numberOfChannels = output.samples.length;
for (var i = 0; i < numberOfChannels; i++) {
var valueA = inputA.samples[i] || 0;
var valueB = inputB.samples[i] || 0;
output.samples[i] = valueA * gainA + valueB * gainB;
}
};
/**
* toString
*
* @return {String} String representation.
*/
LinearCrossFade.prototype.toString = function() {
return 'Linear Cross Fader';
};