mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-17 00:58:09 +00:00
296 lines
No EOL
8.3 KiB
JavaScript
296 lines
No EOL
8.3 KiB
JavaScript
define(["Tone/core/Tone", "Tone/core/Master"], function(Tone){
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/**
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* all signals share a common constant signal generator
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*
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* @static
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* @private
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* @type {OscillatorNode}
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*/
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var generator = Tone.context.createOscillator();
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/**
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* @static
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* @private
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* @type {WaveShaperNode}
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*/
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var constant = Tone.context.createWaveShaper();
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//generate the waveshaper table which outputs 1 for any input value
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(function(){
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var len = 8;
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var curve = new Float32Array(len);
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for (var i = 0; i < len; i++){
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//all inputs produce the output value
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curve[i] = 1;
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}
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constant.curve = curve;
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})();
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generator.connect(constant);
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generator.start(0);
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generator.noGC();
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/**
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* @class Constant audio-rate signal.
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* Tone.Signal is a core component which allows for sample-accurate
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* synchronization of many components. Tone.Signal can be scheduled
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* with all of the functions available to AudioParams
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*
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* @constructor
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* @extends {Tone}
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* @param {number=} value (optional) initial value
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*/
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Tone.Signal = function(value){
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Tone.call(this);
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/**
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* scales the constant output to the desired output
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* @type {GainNode}
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*/
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this.scalar = this.context.createGain();
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/**
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* the ratio of the this value to the control signal value
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*
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* @private
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* @type {number}
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*/
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this._syncRatio = 1;
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//connect the constant 1 output to the node output
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this.chain(constant, this.scalar, this.output);
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//signal passes through
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this.input.connect(this.output);
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//set the default value
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this.setValue(this.defaultArg(value, 0));
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};
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Tone.extend(Tone.Signal);
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/**
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* @return {number} the current value of the signal
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*/
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Tone.Signal.prototype.getValue = function(){
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return this.scalar.gain.value;
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};
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/**
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* set the value of the signal right away
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* will be overwritten if there are previously scheduled automation curves
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*
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* @param {number} value
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*/
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Tone.Signal.prototype.setValue = function(value){
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if (this._syncRatio === 0){
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value = 0;
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} else {
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value *= this._syncRatio;
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}
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this.scalar.gain.value = value;
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};
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/**
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* Schedules a parameter value change at the given time.
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*
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* @param {number} value
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* @param {Tone.Time} time
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*/
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Tone.Signal.prototype.setValueAtTime = function(value, time){
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value *= this._syncRatio;
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this.scalar.gain.setValueAtTime(value, this.toSeconds(time));
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};
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/**
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* creates a schedule point with the current value at the current time
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*
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* @param {number=} now (optionally) pass the now value in
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* @returns {number} the current value
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*/
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Tone.Signal.prototype.setCurrentValueNow = function(now){
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now = this.defaultArg(now, this.now());
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var currentVal = this.getValue();
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this.cancelScheduledValues(now);
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this.scalar.gain.setValueAtTime(currentVal, now);
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return currentVal;
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};
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/**
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* Schedules a linear continuous change in parameter value from the
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* previous scheduled parameter value to the given value.
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*
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* @param {number} value
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* @param {Tone.Time} endTime
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*/
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Tone.Signal.prototype.linearRampToValueAtTime = function(value, endTime){
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value *= this._syncRatio;
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this.scalar.gain.linearRampToValueAtTime(value, this.toSeconds(endTime));
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};
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/**
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* Schedules an exponential continuous change in parameter value from
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* the previous scheduled parameter value to the given value.
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*
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* NOTE: Chrome will throw an error if you try to exponentially ramp to a
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* value 0 or less.
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*
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* @param {number} value
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* @param {Tone.Time} endTime
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*/
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Tone.Signal.prototype.exponentialRampToValueAtTime = function(value, endTime){
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value *= this._syncRatio;
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this.scalar.gain.exponentialRampToValueAtTime(value, this.toSeconds(endTime));
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};
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/**
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* Schedules an exponential continuous change in parameter value from
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* the current time and current value to the given value.
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*
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* @param {number} value
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* @param {Tone.Time} endTime
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*/
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Tone.Signal.prototype.exponentialRampToValueNow = function(value, endTime){
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var now = this.now();
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this.setCurrentValueNow(now);
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value *= this._syncRatio;
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//make sure that the endTime doesn't start with +
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if (endTime.toString().charAt(0) === "+"){
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endTime = endTime.substr(1);
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}
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this.scalar.gain.exponentialRampToValueAtTime(value, now + this.toSeconds(endTime));
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};
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/**
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* Schedules an linear continuous change in parameter value from
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* the current time and current value to the given value at the given time.
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*
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* @param {number} value
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* @param {Tone.Time} endTime
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*/
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Tone.Signal.prototype.linearRampToValueNow = function(value, endTime){
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var now = this.now();
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this.setCurrentValueNow(now);
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value *= this._syncRatio;
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//make sure that the endTime doesn't start with +
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if (endTime.toString().charAt(0) === "+"){
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endTime = endTime.substr(1);
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}
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this.scalar.gain.linearRampToValueAtTime(value, now + this.toSeconds(endTime));
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};
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/**
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* Start exponentially approaching the target value at the given time with
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* a rate having the given time constant.
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*
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* @param {number} value
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* @param {Tone.Time} startTime
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* @param {number} timeConstant
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*/
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Tone.Signal.prototype.setTargetAtTime = function(value, startTime, timeConstant){
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value *= this._syncRatio;
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this.output.gain.setTargetAtTime(value, this.toSeconds(startTime), timeConstant);
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};
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/**
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* Sets an array of arbitrary parameter values starting at the given time
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* for the given duration.
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*
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* @param {Array<number>} values
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* @param {Tone.Time} startTime
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* @param {Tone.Time} duration
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*/
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Tone.Signal.prototype.setValueCurveAtTime = function(values, startTime, duration){
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for (var i = 0; i < values.length; i++){
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values[i] *= this._syncRatio;
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}
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this.scalar.gain.setValueCurveAtTime(values, this.toSeconds(startTime), this.toSeconds(duration));
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};
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/**
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* Cancels all scheduled parameter changes with times greater than or
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* equal to startTime.
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*
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* @param {Tone.Time} startTime
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*/
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Tone.Signal.prototype.cancelScheduledValues = function(startTime){
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this.scalar.gain.cancelScheduledValues(this.toSeconds(startTime));
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};
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/**
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* Sync this to another signal and it will always maintain the
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* ratio between the two signals until it is unsynced
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*
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* Signals can only be synced to one other signal. while syncing,
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* if a signal's value is changed, the new ratio between the signals
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* is maintained as the syncing signal is changed.
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*
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* @param {Tone.Signal} signal to sync to
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* @param {number=} ratio optionally pass in the ratio between
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* the two signals, otherwise it will be computed
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*/
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Tone.Signal.prototype.sync = function(signal, ratio){
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if (ratio){
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this._syncRatio = ratio;
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} else {
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//get the sync ratio
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if (signal.getValue() !== 0){
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this._syncRatio = this.getValue() / signal.getValue();
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} else {
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this._syncRatio = 0;
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}
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}
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//make a new scalar which is not connected to the constant signal
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this.scalar.disconnect();
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this.scalar = this.context.createGain();
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this.chain(signal, this.scalar, this.output);
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//set it ot the sync ratio
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this.scalar.gain.value = this._syncRatio;
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};
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/**
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* unbind the signal control
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*
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* will leave the signal value as it was without the influence of the control signal
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*/
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Tone.Signal.prototype.unsync = function(){
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//make a new scalar so that it's disconnected from the control signal
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//get the current gain
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var currentGain = this.getValue();
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this.scalar.disconnect();
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this.scalar = this.context.createGain();
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this.scalar.gain.value = currentGain / this._syncRatio;
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this._syncRatio = 1;
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//reconnect things up
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this.chain(constant, this.scalar, this.output);
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};
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/**
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* internal dispose method to tear down the node
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*/
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Tone.Signal.prototype.dispose = function(){
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//disconnect everything
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this.output.disconnect();
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this.scalar.disconnect();
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this.output = null;
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this.scalar = null;
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};
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/**
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* Signals can connect to other Signals
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*
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* @override
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* @param {AudioParam|AudioNode|Tone.Signal|Tone} node
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*/
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Tone.Signal.prototype.connect = function(node){
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//zero it out so that the signal can have full control
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if (node instanceof Tone.Signal){
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node.setValue(0);
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} else if (node instanceof AudioParam){
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node.value = 0;
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}
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this.output.connect(node);
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};
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return Tone.Signal;
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}); |