Mirrors/Tone.js
2
0
Fork 0
mirror of https://github.com/Tonejs/Tone.js synced 2024-11-16 08:38:00 +00:00
Code Issues Projects Releases Packages Wiki Activity

removing threshold value

Browse source 
making _worker static
This commit is contained in:
Yotam Mann 2016-03-03 01:34:48 -05:00
parent 89711b336e
commit 724ac4090c
1 changed files with 42 additions and 53 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

95
Tone/core/Clock.js
View file

@ -2,38 +2,6 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
"use strict";
//URL Shim
window.URL = window.URL || window.webkitURL;
/**
* The update rate in Milliseconds
* @const
* @type {Number}
* @private
*/
var UPDATE_RATE = 20;
/**
* The script which runs in a web worker
* @type {Blob}
* @private
*/
var blob = new Blob(["setInterval(function(){self.postMessage('tick')}, "+UPDATE_RATE+")"]);
/**
* Create a blob url from the Blob
* @type {URL}
* @private
*/
var blobUrl = URL.createObjectURL(blob);
/**
* The Worker which generates a regular callback
* @type {Worker}
* @private
*/
var worker = new Worker(blobUrl);
/**
* @class A sample accurate clock which provides a callback at the given rate.
* While the callback is not sample-accurate (it is still susceptible to
@ -83,13 +51,6 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
*/
this._computedLookAhead = UPDATE_RATE/1000;
/**
* The value afterwhich events are thrown out
* @type {Number}
* @private
*/
this._threshold = (UPDATE_RATE/1000) * 3;
/**
* The next time the callback is scheduled.
* @type {Number}
@ -102,7 +63,7 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
* @type {Number}
* @private
*/
this._lastUpdate = 0;
this._lastUpdate = -1;
/**
* The id of the requestAnimationFrame
@ -142,7 +103,7 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
this._boundLoop = this._loop.bind(this);
//bind a callback to the worker thread
worker.addEventListener("message", this._boundLoop);
Tone.Clock._worker.addEventListener("message", this._boundLoop);
this._readOnly("frequency");
};
@ -254,17 +215,16 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
* when the page was loaded.
* @private
*/
Tone.Clock.prototype._loop = function(time){
Tone.Clock.prototype._loop = function(){
//compute the look ahead
if (this._lookAhead === "auto"){
time = Date.now();
var diff = (time - this._lastUpdate) / 1000;
this._lastUpdate = time;
//throw away large differences
if (diff < this._threshold){
var time = this.now();
if (this._lastUpdate !== -1){
var diff = (time - this._lastUpdate) / 1000;
//averaging
this._computedLookAhead = (9 * this._computedLookAhead + diff) / 10;
}
}
this._lastUpdate = time;
} else {
this._computedLookAhead = this._lookAhead;
}
@ -286,10 +246,6 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
}
if (state === Tone.State.Started){
while (now + lookAhead > this._nextTick){
//catch up
if (now > this._nextTick + this._threshold){
this._nextTick = now;
}
var tickTime = this._nextTick;
this._nextTick += 1 / this.frequency.getValueAtTime(this._nextTick);
this.callback(tickTime);
@ -320,7 +276,7 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
Tone.Clock.prototype.dispose = function(){
cancelAnimationFrame(this._loopID);
Tone.TimelineState.prototype.dispose.call(this);
worker.removeEventListener("message", this._boundLoop);
Tone.Clock._worker.removeEventListener("message", this._boundLoop);
this._writable("frequency");
this.frequency.dispose();
this.frequency = null;
@ -331,5 +287,38 @@ define(["Tone/core/Tone", "Tone/signal/TimelineSignal", "Tone/core/TimelineState
this._state = null;
};
//URL Shim
window.URL = window.URL || window.webkitURL;
/**
* The update rate in Milliseconds
* @const
* @type {Number}
* @private
*/
var UPDATE_RATE = 20;
/**
* The script which runs in a web worker
* @type {Blob}
* @private
*/
var blob = new Blob(["setInterval(function(){self.postMessage('tick')}, "+UPDATE_RATE+")"]);
/**
* Create a blob url from the Blob
* @type {URL}
* @private
*/
var blobUrl = URL.createObjectURL(blob);
/**
* The Worker which generates a regular callback
* @type {Worker}
* @private
* @static
*/
Tone.Clock._worker = new Worker(blobUrl);
return Tone.Clock;
});