mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 16:48:00 +00:00
233 lines
No EOL
6.8 KiB
JavaScript
233 lines
No EOL
6.8 KiB
JavaScript
define(["Tone/core/Tone", "Tone/instrument/MonoSynth", "Tone/source/Source"],
|
|
function(Tone){
|
|
|
|
"use strict";
|
|
|
|
/**
|
|
* @class Tone.PolySynth handles voice creation and allocation for any
|
|
* instruments passed in as the second paramter. PolySynth is
|
|
* not a synthesizer by itself, it merely manages voices of
|
|
* one of the other types of synths, allowing any of the
|
|
* monophonic synthesizers to be polyphonic.
|
|
*
|
|
* @constructor
|
|
* @extends {Tone.Instrument}
|
|
* @param {number|Object} [polyphony=4] The number of voices to create
|
|
* @param {function} [voice=Tone.MonoSynth] The constructor of the voices
|
|
* uses Tone.MonoSynth by default.
|
|
* @example
|
|
* //a polysynth composed of 6 Voices of MonoSynth
|
|
* var synth = new Tone.PolySynth(6, Tone.MonoSynth).toMaster();
|
|
* //set the attributes using the set interface
|
|
* synth.set("detune", -1200);
|
|
* //play a chord
|
|
* synth.triggerAttackRelease(["C4", "E4", "A4"], "4n");
|
|
*/
|
|
Tone.PolySynth = function(){
|
|
|
|
Tone.Instrument.call(this);
|
|
|
|
var options = this.optionsObject(arguments, ["polyphony", "voice"], Tone.PolySynth.defaults);
|
|
|
|
/**
|
|
* the array of voices
|
|
* @type {Array}
|
|
*/
|
|
this.voices = new Array(options.polyphony);
|
|
|
|
/**
|
|
* If there are no more voices available,
|
|
* should an active voice be stolen to play the new note?
|
|
* @type {Boolean}
|
|
*/
|
|
this.stealVoices = true;
|
|
|
|
/**
|
|
* the queue of free voices
|
|
* @private
|
|
* @type {Array}
|
|
*/
|
|
this._freeVoices = [];
|
|
|
|
/**
|
|
* keeps track of which notes are down
|
|
* @private
|
|
* @type {Object}
|
|
*/
|
|
this._activeVoices = {};
|
|
|
|
//create the voices
|
|
for (var i = 0; i < options.polyphony; i++){
|
|
var v = new options.voice(arguments[2], arguments[3]);
|
|
this.voices[i] = v;
|
|
v.connect(this.output);
|
|
}
|
|
|
|
//make a copy of the voices
|
|
this._freeVoices = this.voices.slice(0);
|
|
//get the prototypes and properties
|
|
};
|
|
|
|
Tone.extend(Tone.PolySynth, Tone.Instrument);
|
|
|
|
/**
|
|
* the defaults
|
|
* @const
|
|
* @static
|
|
* @type {Object}
|
|
*/
|
|
Tone.PolySynth.defaults = {
|
|
"polyphony" : 4,
|
|
"voice" : Tone.MonoSynth
|
|
};
|
|
|
|
/**
|
|
* Trigger the attack portion of the note
|
|
* @param {Frequency|Array} notes The notes to play. Accepts a single
|
|
* Frequency or an array of frequencies.
|
|
* @param {Time} [time=now] The start time of the note.
|
|
* @param {number} [velocity=1] The velocity of the note.
|
|
* @returns {Tone.PolySynth} this
|
|
* @example
|
|
* //trigger a chord immediately with a velocity of 0.2
|
|
* poly.triggerAttack(["Ab3", "C4", "F5"], undefined, 0.2);
|
|
*/
|
|
Tone.PolySynth.prototype.triggerAttack = function(notes, time, velocity){
|
|
if (!Array.isArray(notes)){
|
|
notes = [notes];
|
|
}
|
|
for (var i = 0; i < notes.length; i++){
|
|
var val = notes[i];
|
|
var stringified = JSON.stringify(val);
|
|
//retrigger the same note if possible
|
|
if (this._activeVoices.hasOwnProperty(stringified)){
|
|
this._activeVoices[stringified].triggerAttack(val, time, velocity);
|
|
} else if (this._freeVoices.length > 0){
|
|
var voice = this._freeVoices.shift();
|
|
voice.triggerAttack(val, time, velocity);
|
|
this._activeVoices[stringified] = voice;
|
|
} else if (this.stealVoices){ //steal a voice
|
|
//take the first voice
|
|
for (var voiceName in this._activeVoices){
|
|
this._activeVoices[voiceName].triggerAttack(val, time, velocity);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Trigger the attack and release after the specified duration
|
|
*
|
|
* @param {Frequency|Array} notes The notes to play. Accepts a single
|
|
* Frequency or an array of frequencies.
|
|
* @param {Time} duration the duration of the note
|
|
* @param {Time} [time=now] if no time is given, defaults to now
|
|
* @param {number} [velocity=1] the velocity of the attack (0-1)
|
|
* @returns {Tone.PolySynth} this
|
|
* @example
|
|
* //trigger a chord for a duration of a half note
|
|
* poly.triggerAttackRelease(["Eb3", "G4", "C5"], "2n");
|
|
*/
|
|
Tone.PolySynth.prototype.triggerAttackRelease = function(notes, duration, time, velocity){
|
|
time = this.toSeconds(time);
|
|
this.triggerAttack(notes, time, velocity);
|
|
this.triggerRelease(notes, time + this.toSeconds(duration));
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Trigger the release of the note. Unlike monophonic instruments,
|
|
* a note (or array of notes) needs to be passed in as the first argument.
|
|
* @param {Frequency|Array} notes The notes to play. Accepts a single
|
|
* Frequency or an array of frequencies.
|
|
* @param {Time} [time=now] When the release will be triggered.
|
|
* @returns {Tone.PolySynth} this
|
|
* @example
|
|
* poly.triggerRelease(["Ab3", "C4", "F5"], "+2n");
|
|
*/
|
|
Tone.PolySynth.prototype.triggerRelease = function(notes, time){
|
|
if (!Array.isArray(notes)){
|
|
notes = [notes];
|
|
}
|
|
for (var i = 0; i < notes.length; i++){
|
|
//get the voice
|
|
var stringified = JSON.stringify(notes[i]);
|
|
var voice = this._activeVoices[stringified];
|
|
if (voice){
|
|
voice.triggerRelease(time);
|
|
this._freeVoices.push(voice);
|
|
delete this._activeVoices[stringified];
|
|
voice = null;
|
|
}
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Set a member/attribute of the voices.
|
|
* @param {Object|string} params
|
|
* @param {number=} value
|
|
* @param {Time=} rampTime
|
|
* @returns {Tone.PolySynth} this
|
|
* @example
|
|
* poly.set({
|
|
* "filter" : {
|
|
* "type" : "highpass"
|
|
* },
|
|
* "envelope" : {
|
|
* "attack" : 0.25
|
|
* }
|
|
* });
|
|
*/
|
|
Tone.PolySynth.prototype.set = function(params, value, rampTime){
|
|
for (var i = 0; i < this.voices.length; i++){
|
|
this.voices[i].set(params, value, rampTime);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Get the synth's attributes. Given no arguments get
|
|
* will return all available object properties and their corresponding
|
|
* values. Pass in a single attribute to retrieve or an array
|
|
* of attributes. The attribute strings can also include a "."
|
|
* to access deeper properties.
|
|
* @param {Array=} params the parameters to get, otherwise will return
|
|
* all available.
|
|
*/
|
|
Tone.PolySynth.prototype.get = function(params){
|
|
return this.voices[0].get(params);
|
|
};
|
|
|
|
/**
|
|
* Trigger the release portion of all the currently active voices.
|
|
* @param {Time} [time=now] When the notes should be released.
|
|
* @return {Tone.PolySynth} this
|
|
*/
|
|
Tone.PolySynth.prototype.releaseAll = function(time){
|
|
for (var i = 0; i < this.voices.length; i++){
|
|
this.voices[i].triggerRelease(time);
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Clean up.
|
|
* @returns {Tone.PolySynth} this
|
|
*/
|
|
Tone.PolySynth.prototype.dispose = function(){
|
|
Tone.Instrument.prototype.dispose.call(this);
|
|
for (var i = 0; i < this.voices.length; i++){
|
|
this.voices[i].dispose();
|
|
this.voices[i] = null;
|
|
}
|
|
this.voices = null;
|
|
this._activeVoices = null;
|
|
this._freeVoices = null;
|
|
return this;
|
|
};
|
|
|
|
return Tone.PolySynth;
|
|
}); |