mirror of
https://github.com/Tonejs/Tone.js
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103 lines
No EOL
2.5 KiB
JavaScript
103 lines
No EOL
2.5 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/Signal", "Tone/signal/Expr", "Tone/component/Merge"],
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function(Tone){
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"use strict";
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/**
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* @class Mid/Side processing separates the the 'mid' signal
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* (which comes out of both the left and the right channel)
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* and the 'side' (which only comes out of the the side channels).
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* MidSideMerge merges the mid and side signal after they've been seperated
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* by Tone.MidSideSplit.<br><br>
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* <code>
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* Left = (Mid+Side)/sqrt(2); // obtain left signal from mid and side<br>
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* Right = (Mid-Side)/sqrt(2); // obtain right signal from mid and side<br>
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* </code>
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*
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* @extends {Tone.StereoEffect}
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* @constructor
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*/
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Tone.MidSideMerge = function(){
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Tone.call(this, 2, 0);
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/**
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* The mid signal input. Alias for
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* <code>input[0]</code>
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* @type {GainNode}
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*/
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this.mid = this.input[0] = this.context.createGain();
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/**
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* recombine the mid/side into Left
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* @type {Tone.Expr}
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* @private
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*/
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this._left = new Tone.Expr("($0 + $1) * $2");
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/**
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* The side signal input. Alias for
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* <code>input[1]</code>
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* @type {GainNode}
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*/
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this.side = this.input[1] = this.context.createGain();
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/**
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* recombine the mid/side into Right
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* @type {Tone.Expr}
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* @private
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*/
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this._right = new Tone.Expr("($0 - $1) * $2");
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/**
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* Merge the left/right signal back into a stereo signal.
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* @type {Tone.Merge}
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* @private
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*/
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this._merge = this.output = new Tone.Merge();
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this.mid.connect(this._left, 0, 0);
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this.side.connect(this._left, 0, 1);
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this.mid.connect(this._right, 0, 0);
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this.side.connect(this._right, 0, 1);
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this._left.connect(this._merge, 0, 0);
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this._right.connect(this._merge, 0, 1);
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sqrtTwo.connect(this._left, 0, 2);
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sqrtTwo.connect(this._right, 0, 2);
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};
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Tone.extend(Tone.MidSideMerge);
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/**
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* A constant signal equal to 1 / sqrt(2).
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* @type {Number}
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* @signal
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* @private
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* @static
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*/
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var sqrtTwo = null;
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Tone._initAudioContext(function(){
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sqrtTwo = new Tone.Signal(1 / Math.sqrt(2));
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});
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/**
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* clean up
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* @returns {Tone.MidSideMerge} this
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*/
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Tone.MidSideMerge.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this.mid.disconnect();
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this.mid = null;
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this.side.disconnect();
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this.side = null;
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this._left.dispose();
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this._left = null;
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this._right.dispose();
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this._right = null;
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this._merge.dispose();
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this._merge = null;
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return this;
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};
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return Tone.MidSideMerge;
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}); |