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https://github.com/Tonejs/Tone.js
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a427070904
This is to get around an optimization in most browsers which stops processing when the gain is equal 0 in the Signal.
62 lines
No EOL
1.5 KiB
JavaScript
62 lines
No EOL
1.5 KiB
JavaScript
define(["Tone/core/Tone", "Tone/core/Gain"], function (Tone) {
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/**
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* @class Tone.Zero outputs 0's at audio-rate. The reason this has to be
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* it's own class is that many browsers optimize out Tone.Signal
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* with a value of 0 and will not process nodes further down the graph.
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* @extends {Tone}
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*/
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Tone.Zero = function(){
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/**
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* The gain node
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* @type {Tone.Gain}
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* @private
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*/
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this._gain = this.input = this.output = new Tone.Gain();
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Tone.Zero._zeros.connect(this._gain);
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};
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Tone.extend(Tone.Zero);
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/**
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* clean up
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* @return {Tone.Zero} this
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*/
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Tone.Zero.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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return this;
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};
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/**
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* Generates a constant output of 0. This is so
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* the processing graph doesn't optimize out this
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* segment of the graph.
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* @static
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* @private
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* @const
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* @type {AudioBufferSourceNode}
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*/
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Tone.Zero._zeros = null;
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/**
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* initializer function
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*/
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Tone._initAudioContext(function(audioContext){
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var buffer = audioContext.createBuffer(1, 128, audioContext.sampleRate);
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var arr = buffer.getChannelData(0);
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for (var i = 0; i < arr.length; i++){
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arr[i] = 0;
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}
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Tone.Zero._zeros = audioContext.createBufferSource();
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Tone.Zero._zeros.channelCount = 1;
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Tone.Zero._zeros.channelCountMode = "explicit";
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Tone.Zero._zeros.buffer = buffer;
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Tone.Zero._zeros.loop = true;
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Tone.Zero._zeros.start(0);
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Tone.Zero._zeros.noGC();
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});
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return Tone.Zero;
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}); |