mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 08:38:00 +00:00
316 lines
No EOL
8.6 KiB
JavaScript
316 lines
No EOL
8.6 KiB
JavaScript
define(["Tone/core/Tone", "Tone/core/Transport"], function(Tone){
|
|
|
|
"use strict";
|
|
|
|
/**
|
|
* @class A timed note. Creating a note will register a callback
|
|
* which will be invoked on the channel at the time with
|
|
* whatever value was specified.
|
|
*
|
|
* @constructor
|
|
* @param {number|string} channel the channel name of the note
|
|
* @param {Tone.Time} time the time when the note will occur
|
|
* @param {string|number|Object|Array} value the value of the note
|
|
*/
|
|
Tone.Note = function(channel, time, value){
|
|
|
|
/**
|
|
* the value of the note. This value is returned
|
|
* when the channel callback is invoked.
|
|
*
|
|
* @type {string|number|Object}
|
|
*/
|
|
this.value = value;
|
|
|
|
/**
|
|
* the channel name or number
|
|
*
|
|
* @type {string|number}
|
|
* @private
|
|
*/
|
|
this._channel = channel;
|
|
|
|
/**
|
|
* an internal reference to the id of the timeline
|
|
* callback which is set.
|
|
*
|
|
* @type {number}
|
|
* @private
|
|
*/
|
|
this._timelineID = Tone.Transport.setTimeline(this._trigger.bind(this), time);
|
|
};
|
|
|
|
/**
|
|
* invoked by the timeline
|
|
* @private
|
|
* @param {number} time the time at which the note should play
|
|
*/
|
|
Tone.Note.prototype._trigger = function(time){
|
|
//invoke the callback
|
|
channelCallbacks(this._channel, time, this.value);
|
|
};
|
|
|
|
/**
|
|
* clean up
|
|
* @returns {Tone.Note} `this`
|
|
*/
|
|
Tone.Note.prototype.dispose = function(){
|
|
Tone.Tranport.clearTimeline(this._timelineID);
|
|
this.value = null;
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* @private
|
|
* @static
|
|
* @type {Object}
|
|
*/
|
|
var NoteChannels = {};
|
|
|
|
/**
|
|
* invoke all of the callbacks on a specific channel
|
|
* @private
|
|
*/
|
|
function channelCallbacks(channel, time, value){
|
|
if (NoteChannels.hasOwnProperty(channel)){
|
|
var callbacks = NoteChannels[channel];
|
|
for (var i = 0, len = callbacks.length; i < len; i++){
|
|
var callback = callbacks[i];
|
|
if (Array.isArray(value)){
|
|
callback.apply(window, [time].concat(value));
|
|
} else {
|
|
callback(time, value);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* listen to a specific channel, get all of the note callbacks
|
|
* @static
|
|
* @param {string|number} channel the channel to route note events from
|
|
* @param {function(*)} callback callback to be invoked when a note will occur
|
|
* on the specified channel
|
|
*/
|
|
Tone.Note.route = function(channel, callback){
|
|
if (NoteChannels.hasOwnProperty(channel)){
|
|
NoteChannels[channel].push(callback);
|
|
} else {
|
|
NoteChannels[channel] = [callback];
|
|
}
|
|
};
|
|
|
|
/**
|
|
* remove a callback from a channel
|
|
* @static
|
|
*/
|
|
Tone.Note.unroute = function(channel, callback){
|
|
if (NoteChannels.hasOwnProperty(channel)){
|
|
var channelCallback = NoteChannels[channel];
|
|
var index = channelCallback.indexOf(callback);
|
|
if (index !== -1){
|
|
NoteChannels[channel].splice(index, 1);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Parses a score and registers all of the notes along the timeline.
|
|
*
|
|
* Scores are a JSON object with instruments at the top level
|
|
* and an array of time and values. The value of a note can be 0 or more
|
|
* parameters.
|
|
*
|
|
* The only requirement for the score format is that the time is the first (or only)
|
|
* value in the array. All other values are optional and will be passed into the callback
|
|
* function registered using ""
|
|
*
|
|
* ```javascript
|
|
* var score = {
|
|
* "synth" : [["0", "C3"], ["0:1", "D3"], ["0:2", "E3"], ... ],
|
|
* "bass" : [["0", "C2"], ["1:0", "A2"], ["2:0", "C2"], ["3:0", "A2"], ... ],
|
|
* "kick" : ["0", "0:2", "1:0", "1:2", "2:0", ... ],
|
|
* //...
|
|
* };
|
|
* ```
|
|
*
|
|
* To convert MIDI files to score notation, take a look at utils/MidiToScore.js
|
|
*
|
|
* @static
|
|
* @param {Object} score
|
|
* @return {Array<Tone.Note>} an array of all of the notes that were created
|
|
*/
|
|
Tone.Note.parseScore = function(score){
|
|
var notes = [];
|
|
for (var inst in score){
|
|
var part = score[inst];
|
|
if (inst === "tempo"){
|
|
Tone.Transport.setBpm(part);
|
|
} else if (inst === "timeSignature"){
|
|
Tone.Transport.setTimeSignature(part[0], part[1]);
|
|
} else if (Array.isArray(part)){
|
|
for (var i = 0; i < part.length; i++){
|
|
var noteDescription = part[i];
|
|
var note;
|
|
if (Array.isArray(noteDescription)){
|
|
var time = noteDescription[0];
|
|
var value = noteDescription.slice(1);
|
|
note = new Tone.Note(inst, time, value);
|
|
} else {
|
|
note = new Tone.Note(inst, noteDescription);
|
|
}
|
|
notes.push(note);
|
|
}
|
|
} else {
|
|
throw new TypeError("score parts must be Arrays");
|
|
}
|
|
}
|
|
return notes;
|
|
};
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
// MUSIC NOTES
|
|
//
|
|
// Augments Tone.prototype to include note methods
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
var noteToIndex = { "c" : 0, "c#" : 1, "db" : 1, "d" : 2, "d#" : 3, "eb" : 3,
|
|
"e" : 4, "f" : 5, "f#" : 6, "gb" : 6, "g" : 7, "g#" : 8, "ab" : 8,
|
|
"a" : 9, "a#" : 10, "bb" : 10, "b" : 11
|
|
};
|
|
|
|
var noteIndexToNote = ["C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A", "A#", "B"];
|
|
|
|
var middleC = 261.6255653005986;
|
|
|
|
/**
|
|
* convert a note name to frequency (i.e. A4 to 440)
|
|
* defined in "Tone/core/Note"
|
|
*
|
|
* @param {string} note
|
|
* @return {number}
|
|
*/
|
|
Tone.prototype.noteToFrequency = function(note){
|
|
//break apart the note by frequency and octave
|
|
var parts = note.split(/(\d+)/);
|
|
if (parts.length === 3){
|
|
var index = noteToIndex[parts[0].toLowerCase()];
|
|
var octave = parts[1];
|
|
var noteNumber = index + parseInt(octave, 10) * 12;
|
|
return Math.pow(2, (noteNumber - 48) / 12) * middleC;
|
|
} else {
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* test if a string is in note format: i.e. "C4"
|
|
* @param {string|number} note the note to test
|
|
* @return {boolean} true if it's in the form of a note
|
|
* @method isNotation
|
|
* @lends Tone.prototype.isNotation
|
|
*/
|
|
Tone.prototype.isNote = ( function(){
|
|
var noteFormat = new RegExp(/[a-g]{1}([b#]{1}|[b#]{0})[0-9]+$/i);
|
|
return function(note){
|
|
if (typeof note === "string"){
|
|
note = note.toLowerCase();
|
|
}
|
|
return noteFormat.test(note);
|
|
};
|
|
})();
|
|
|
|
/**
|
|
* a pointer to the previous toFrequency method
|
|
* @private
|
|
* @function
|
|
*/
|
|
Tone.prototype._overwrittenToFrequency = Tone.prototype.toFrequency;
|
|
|
|
/**
|
|
* a to frequency method which accepts frequencies in the form
|
|
* of notes ("C#4"), frequencies as strings ("49hz"), frequency numbers,
|
|
* or notation ("4n")
|
|
* @param {string|number} note the note name or notation
|
|
* @return {number} the frequency as a number
|
|
*/
|
|
Tone.prototype.toFrequency = function(note){
|
|
if (this.isNote(note)){
|
|
note = this.noteToFrequency(note);
|
|
}
|
|
return this._overwrittenToFrequency(note);
|
|
};
|
|
|
|
/**
|
|
* convert a note name (i.e. A4, C#5, etc to a frequency)
|
|
* defined in "Tone/core/Note"
|
|
*
|
|
* @param {number} freq
|
|
* @return {string}
|
|
*/
|
|
Tone.prototype.frequencyToNote = function(freq){
|
|
var log = Math.log(freq / middleC) / Math.LN2;
|
|
var noteNumber = Math.round(12 * log) + 48;
|
|
var octave = Math.floor(noteNumber/12);
|
|
var noteName = noteIndexToNote[noteNumber % 12];
|
|
return noteName + octave.toString();
|
|
};
|
|
|
|
/**
|
|
* convert an interval (in semitones) to a frequency ratio
|
|
* defined in "Tone/core/Note"
|
|
*
|
|
* ```javascript
|
|
* tone.intervalToFrequencyRatio(0); // returns 1
|
|
* tone.intervalToFrequencyRatio(12); // returns 2
|
|
* ```
|
|
*
|
|
* @param {number} interval the number of semitones above the base note
|
|
* @return {number} the frequency ratio
|
|
*/
|
|
Tone.prototype.intervalToFrequencyRatio = function(interval){
|
|
return Math.pow(2,(interval/12));
|
|
};
|
|
|
|
/**
|
|
* convert a midi note number into a note name
|
|
* defined in "Tone/core/Note"
|
|
*
|
|
* ```javascript
|
|
* tone.midiToNote(60); // returns "C3"
|
|
* ```
|
|
*
|
|
* @param {number} midiNumber the midi note number
|
|
* @return {string} the note's name and octave
|
|
*/
|
|
Tone.prototype.midiToNote = function(midiNumber){
|
|
var octave = Math.floor(midiNumber / 12) - 2;
|
|
var note = midiNumber % 12;
|
|
return noteIndexToNote[note] + octave;
|
|
};
|
|
|
|
/**
|
|
* convert a note to it's midi value
|
|
* defined in "Tone/core/Note"
|
|
*
|
|
* ```javascript
|
|
* tone.noteToMidi("C3"); // returns 60
|
|
* ```
|
|
*
|
|
* @param {string} note the note name (i.e. "C3")
|
|
* @return {number} the midi value of that note
|
|
*/
|
|
Tone.prototype.noteToMidi = function(note){
|
|
//break apart the note by frequency and octave
|
|
var parts = note.split(/(\d+)/);
|
|
if (parts.length === 3){
|
|
var index = noteToIndex[parts[0].toLowerCase()];
|
|
var octave = parts[1];
|
|
return index + (parseInt(octave, 10) + 2) * 12;
|
|
} else {
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
return Tone.Note;
|
|
}); |