mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 08:38:00 +00:00
371 lines
No EOL
11 KiB
JavaScript
371 lines
No EOL
11 KiB
JavaScript
define(["Tone/core/Tone", "Tone/type/Type"], function(Tone){
|
|
|
|
"use strict";
|
|
|
|
/**
|
|
* @class Tone.Param wraps the native Web Audio's AudioParam to provide
|
|
* additional unit conversion functionality. It also
|
|
* serves as a base-class for classes which have a single,
|
|
* automatable parameter.
|
|
* @extends {Tone}
|
|
* @param {AudioParam} param The parameter to wrap.
|
|
* @param {Tone.Type} units The units of the audio param.
|
|
* @param {Boolean} convert If the param should be converted.
|
|
*/
|
|
Tone.Param = function(){
|
|
|
|
var options = this.optionsObject(arguments, ["param", "units", "convert"], Tone.Param.defaults);
|
|
|
|
/**
|
|
* The native parameter to control
|
|
* @type {AudioParam}
|
|
* @private
|
|
*/
|
|
this._param = this.input = options.param;
|
|
|
|
/**
|
|
* The units of the parameter
|
|
* @type {Tone.Type}
|
|
*/
|
|
this.units = options.units;
|
|
|
|
/**
|
|
* If the value should be converted or not
|
|
* @type {Boolean}
|
|
*/
|
|
this.convert = options.convert;
|
|
|
|
/**
|
|
* True if the signal value is being overridden by
|
|
* a connected signal.
|
|
* @readOnly
|
|
* @type {boolean}
|
|
* @private
|
|
*/
|
|
this.overridden = false;
|
|
|
|
/**
|
|
* If there is an LFO, this is where it is held.
|
|
* @type {Tone.LFO}
|
|
* @private
|
|
*/
|
|
this._lfo = null;
|
|
|
|
if (this.isObject(options.lfo)){
|
|
this.value = options.lfo;
|
|
} else if (!this.isUndef(options.value)){
|
|
this.value = options.value;
|
|
}
|
|
};
|
|
|
|
Tone.extend(Tone.Param);
|
|
|
|
/**
|
|
* Defaults
|
|
* @type {Object}
|
|
* @const
|
|
*/
|
|
Tone.Param.defaults = {
|
|
"units" : Tone.Type.Default,
|
|
"convert" : true,
|
|
"param" : undefined
|
|
};
|
|
|
|
/**
|
|
* The current value of the parameter.
|
|
* @memberOf Tone.Param#
|
|
* @type {Number}
|
|
* @name value
|
|
*/
|
|
Object.defineProperty(Tone.Param.prototype, "value", {
|
|
get : function(){
|
|
return this._toUnits(this._param.value);
|
|
},
|
|
set : function(value){
|
|
if (this.isObject(value)){
|
|
//throw an error if the LFO needs to be included
|
|
if (this.isUndef(Tone.LFO)){
|
|
throw new Error("Include 'Tone.LFO' to use an LFO as a Param value.");
|
|
}
|
|
//remove the old one
|
|
if (this._lfo){
|
|
this._lfo.dispose();
|
|
}
|
|
this._lfo = new Tone.LFO(value).start();
|
|
this._lfo.connect(this.input);
|
|
} else {
|
|
var convertedVal = this._fromUnits(value);
|
|
this._param.cancelScheduledValues(0);
|
|
this._param.value = convertedVal;
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Convert the given value from the type specified by Tone.Param.units
|
|
* into the destination value (such as Gain or Frequency).
|
|
* @private
|
|
* @param {*} val the value to convert
|
|
* @return {number} the number which the value should be set to
|
|
*/
|
|
Tone.Param.prototype._fromUnits = function(val){
|
|
if (this.convert || this.isUndef(this.convert)){
|
|
switch(this.units){
|
|
case Tone.Type.Time:
|
|
return this.toSeconds(val);
|
|
case Tone.Type.Frequency:
|
|
return this.toFrequency(val);
|
|
case Tone.Type.Decibels:
|
|
return this.dbToGain(val);
|
|
case Tone.Type.NormalRange:
|
|
return Math.min(Math.max(val, 0), 1);
|
|
case Tone.Type.AudioRange:
|
|
return Math.min(Math.max(val, -1), 1);
|
|
case Tone.Type.Positive:
|
|
return Math.max(val, 0);
|
|
default:
|
|
return val;
|
|
}
|
|
} else {
|
|
return val;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Convert the parameters value into the units specified by Tone.Param.units.
|
|
* @private
|
|
* @param {number} val the value to convert
|
|
* @return {number}
|
|
*/
|
|
Tone.Param.prototype._toUnits = function(val){
|
|
if (this.convert || this.isUndef(this.convert)){
|
|
switch(this.units){
|
|
case Tone.Type.Decibels:
|
|
return this.gainToDb(val);
|
|
default:
|
|
return val;
|
|
}
|
|
} else {
|
|
return val;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* the minimum output value
|
|
* @type {Number}
|
|
* @private
|
|
*/
|
|
Tone.Param.prototype._minOutput = 0.00001;
|
|
|
|
/**
|
|
* Schedules a parameter value change at the given time.
|
|
* @param {*} value The value to set the signal.
|
|
* @param {Time} time The time when the change should occur.
|
|
* @returns {Tone.Param} this
|
|
* @example
|
|
* //set the frequency to "G4" in exactly 1 second from now.
|
|
* freq.setValueAtTime("G4", "+1");
|
|
*/
|
|
Tone.Param.prototype.setValueAtTime = function(value, time){
|
|
value = this._fromUnits(value);
|
|
this._param.setValueAtTime(value, this.toSeconds(time));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Creates a schedule point with the current value at the current time.
|
|
* This is useful for creating an automation anchor point in order to
|
|
* schedule changes from the current value.
|
|
*
|
|
* @param {number=} now (Optionally) pass the now value in.
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.setRampPoint = function(now){
|
|
now = this.defaultArg(now, this.now());
|
|
var currentVal = this._param.value;
|
|
// exponentialRampToValueAt cannot ever ramp from or to 0
|
|
// More info: https://bugzilla.mozilla.org/show_bug.cgi?id=1125600#c2
|
|
if (currentVal === 0){
|
|
currentVal = this._minOutput;
|
|
}
|
|
this._param.setValueAtTime(currentVal, now);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Schedules a linear continuous change in parameter value from the
|
|
* previous scheduled parameter value to the given value.
|
|
*
|
|
* @param {number} value
|
|
* @param {Time} endTime
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.linearRampToValueAtTime = function(value, endTime){
|
|
value = this._fromUnits(value);
|
|
this._param.linearRampToValueAtTime(value, this.toSeconds(endTime));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Schedules an exponential continuous change in parameter value from
|
|
* the previous scheduled parameter value to the given value.
|
|
*
|
|
* @param {number} value
|
|
* @param {Time} endTime
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.exponentialRampToValueAtTime = function(value, endTime){
|
|
value = this._fromUnits(value);
|
|
value = Math.max(this._minOutput, value);
|
|
this._param.exponentialRampToValueAtTime(value, this.toSeconds(endTime));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Schedules an exponential continuous change in parameter value from
|
|
* the current time and current value to the given value over the
|
|
* duration of the rampTime.
|
|
*
|
|
* @param {number} value The value to ramp to.
|
|
* @param {Time} rampTime the time that it takes the
|
|
* value to ramp from it's current value
|
|
* @param {Time} [startTime=now] When the ramp should start.
|
|
* @returns {Tone.Param} this
|
|
* @example
|
|
* //exponentially ramp to the value 2 over 4 seconds.
|
|
* signal.exponentialRampToValue(2, 4);
|
|
*/
|
|
Tone.Param.prototype.exponentialRampToValue = function(value, rampTime, startTime){
|
|
startTime = this.toSeconds(startTime);
|
|
this.setRampPoint(startTime);
|
|
this.exponentialRampToValueAtTime(value, startTime + this.toSeconds(rampTime));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Schedules an linear continuous change in parameter value from
|
|
* the current time and current value to the given value over the
|
|
* duration of the rampTime.
|
|
*
|
|
* @param {number} value The value to ramp to.
|
|
* @param {Time} rampTime the time that it takes the
|
|
* value to ramp from it's current value
|
|
* @param {Time} [startTime=now] When the ramp should start.
|
|
* @returns {Tone.Param} this
|
|
* @example
|
|
* //linearly ramp to the value 4 over 3 seconds.
|
|
* signal.linearRampToValue(4, 3);
|
|
*/
|
|
Tone.Param.prototype.linearRampToValue = function(value, rampTime, startTime){
|
|
startTime = this.toSeconds(startTime);
|
|
this.setRampPoint(startTime);
|
|
this.linearRampToValueAtTime(value, startTime + this.toSeconds(rampTime));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Start exponentially approaching the target value at the given time with
|
|
* a rate having the given time constant.
|
|
* @param {number} value
|
|
* @param {Time} startTime
|
|
* @param {number} timeConstant
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.setTargetAtTime = function(value, startTime, timeConstant){
|
|
value = this._fromUnits(value);
|
|
// The value will never be able to approach without timeConstant > 0.
|
|
// http://www.w3.org/TR/webaudio/#dfn-setTargetAtTime, where the equation
|
|
// is described. 0 results in a division by 0.
|
|
value = Math.max(this._minOutput, value);
|
|
timeConstant = Math.max(this._minOutput, timeConstant);
|
|
this._param.setTargetAtTime(value, this.toSeconds(startTime), timeConstant);
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Sets an array of arbitrary parameter values starting at the given time
|
|
* for the given duration.
|
|
*
|
|
* @param {Array} values
|
|
* @param {Time} startTime
|
|
* @param {Time} duration
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.setValueCurveAtTime = function(values, startTime, duration){
|
|
for (var i = 0; i < values.length; i++){
|
|
values[i] = this._fromUnits(values[i]);
|
|
}
|
|
this._param.setValueCurveAtTime(values, this.toSeconds(startTime), this.toSeconds(duration));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Cancels all scheduled parameter changes with times greater than or
|
|
* equal to startTime.
|
|
*
|
|
* @param {Time} startTime
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.cancelScheduledValues = function(startTime){
|
|
this._param.cancelScheduledValues(this.toSeconds(startTime));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Ramps to the given value over the duration of the rampTime.
|
|
* Automatically selects the best ramp type (exponential or linear)
|
|
* depending on the `units` of the signal
|
|
*
|
|
* @param {number} value
|
|
* @param {Time} rampTime The time that it takes the
|
|
* value to ramp from it's current value
|
|
* @param {Time} [startTime=now] When the ramp should start.
|
|
* @returns {Tone.Param} this
|
|
* @example
|
|
* //ramp to the value either linearly or exponentially
|
|
* //depending on the "units" value of the signal
|
|
* signal.rampTo(0, 10);
|
|
* @example
|
|
* //schedule it to ramp starting at a specific time
|
|
* signal.rampTo(0, 10, 5)
|
|
*/
|
|
Tone.Param.prototype.rampTo = function(value, rampTime, startTime){
|
|
rampTime = this.defaultArg(rampTime, 0);
|
|
if (this.units === Tone.Type.Frequency || this.units === Tone.Type.BPM){
|
|
this.exponentialRampToValue(value, rampTime, startTime);
|
|
} else {
|
|
this.linearRampToValue(value, rampTime, startTime);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* The LFO created by the signal instance. If none
|
|
* was created, this is null.
|
|
* @type {Tone.LFO}
|
|
* @readOnly
|
|
* @memberOf Tone.Param#
|
|
* @name lfo
|
|
*/
|
|
Object.defineProperty(Tone.Param.prototype, "lfo", {
|
|
get : function(){
|
|
return this._lfo;
|
|
}
|
|
});
|
|
|
|
/**
|
|
* Clean up
|
|
* @returns {Tone.Param} this
|
|
*/
|
|
Tone.Param.prototype.dispose = function(){
|
|
Tone.prototype.dispose.call(this);
|
|
this._param = null;
|
|
if (this._lfo){
|
|
this._lfo.dispose();
|
|
this._lfo = null;
|
|
}
|
|
return this;
|
|
};
|
|
|
|
return Tone.Param;
|
|
}); |