mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-17 00:58:09 +00:00
119 lines
No EOL
3.5 KiB
JavaScript
119 lines
No EOL
3.5 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/WaveShaper", "Tone/core/Type", "Tone/core/Param", "Tone/core/Gain"], function(Tone){
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"use strict";
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/**
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* @class A signal is an audio-rate value. Tone.Signal is a core component of the library.
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* Unlike a number, Signals can be scheduled with sample-level accuracy. Tone.Signal
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* has all of the methods available to native Web Audio
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* [AudioParam](http://webaudio.github.io/web-audio-api/#the-audioparam-interface)
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* as well as additional conveniences. Read more about working with signals
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* [here](https://github.com/Tonejs/Tone.js/wiki/Signals).
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*
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* @constructor
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* @extends {Tone.Param}
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* @param {Number|AudioParam} [value] Initial value of the signal. If an AudioParam
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* is passed in, that parameter will be wrapped
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* and controlled by the Signal.
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* @param {string} [units=Number] unit The units the signal is in.
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* @example
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* var signal = new Tone.Signal(10);
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*/
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Tone.Signal = function(){
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var options = this.optionsObject(arguments, ["value", "units"], Tone.Signal.defaults);
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/**
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* The node where the constant signal value is scaled.
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* @type {GainNode}
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* @private
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*/
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this.output = this._gain = this.context.createGain();
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options.param = this._gain.gain;
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Tone.Param.call(this, options);
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/**
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* The node where the value is set.
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* @type {Tone.Param}
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* @private
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*/
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this.input = this._param = this._gain.gain;
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//connect the const output to the node output
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Tone.Signal._constant.chain(this._gain);
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};
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Tone.extend(Tone.Signal, Tone.Param);
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/**
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* The default values
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* @type {Object}
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* @static
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* @const
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*/
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Tone.Signal.defaults = {
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"value" : 0,
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"units" : Tone.Type.Default,
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"convert" : true,
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};
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/**
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* When signals connect to other signals or AudioParams,
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* they take over the output value of that signal or AudioParam.
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* For all other nodes, the behavior is the same as a default <code>connect</code>.
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*
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* @override
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* @param {AudioParam|AudioNode|Tone.Signal|Tone} node
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* @param {number} [outputNumber=0] The output number to connect from.
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* @param {number} [inputNumber=0] The input number to connect to.
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* @returns {Tone.SignalBase} this
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* @method
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*/
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Tone.Signal.prototype.connect = Tone.SignalBase.prototype.connect;
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/**
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* dispose and disconnect
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* @returns {Tone.Signal} this
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*/
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Tone.Signal.prototype.dispose = function(){
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Tone.Param.prototype.dispose.call(this);
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this._param = null;
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this._gain.disconnect();
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this._gain = null;
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return this;
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};
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///////////////////////////////////////////////////////////////////////////
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// STATIC
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///////////////////////////////////////////////////////////////////////////
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/**
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* Generates a constant output of 1.
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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.Signal._constant = 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] = 1;
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}
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Tone.Signal._constant = audioContext.createBufferSource();
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Tone.Signal._constant.channelCount = 1;
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Tone.Signal._constant.channelCountMode = "explicit";
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Tone.Signal._constant.buffer = buffer;
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Tone.Signal._constant.loop = true;
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Tone.Signal._constant.start(0);
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Tone.Signal._constant.noGC();
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});
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return Tone.Signal;
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}); |