Audio: Added support for AudioBufferSourceNode.detune

docs/api/en/audio/Audio.html

@@ -62,6 +62,9 @@
 		<h3>[property:AudioContext context]</h3>
 		<p>The [link:https://developer.mozilla.org/en-US/docs/Web/API/AudioContext AudioContext] of the [page:AudioListener listener] given in the constructor.</p>
 
+		<h3>[property:Number detune]</h3>
+		<p>Modify pitch, measured in cents. +/- 100 is a semitone. +/- 1200 is an octave. Default is *0*.</p>
+
 		<h3>[property:Array filters]</h3>
 		<p>Represents an array of [link:https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode BiquadFilterNodes]. Can be used to apply a variety of low-order filters to create more complex sound effects. Filters are set via [page:Audio.setFilter] or [page:Audio.setFilters].</p>
 

docs/api/zh/audio/Audio.html

@@ -62,6 +62,9 @@
 		<h3>[property:AudioContext context]</h3>
 		<p>构造函数中传入[page:AudioListener listener]的[link:https://developer.mozilla.org/en-US/docs/Web/API/AudioContext AudioContext].</p>
 
+		<h3>[property:Number detune]</h3>
+		<p>TODO</p>
+
 		<h3>[property:Array filters]</h3>
 		<p>表示[link:https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode BiquadFilterNodes]的数组. 可以使用多种不同的低阶filters去创建复杂的音效. filters可以通过 [page:Audio.setFilter] 或者 [page:Audio.setFilters]设置.</p>
 

src/audio/Audio.js

@@ -20,6 +20,7 @@ function Audio( listener ) {
 	this.autoplay = false;
 
 	this.buffer = null;
+	this.detune = 0;
 	this.loop = false;
 	this.startTime = 0;
 	this.offset = 0;
@@ -94,6 +95,7 @@ Audio.prototype = Object.assign( Object.create( Object3D.prototype ), {
 		var source = this.context.createBufferSource();
 
 		source.buffer = this.buffer;
+		source.detune.value = this.detune;
 		source.loop = this.loop;
 		source.onended = this.onEnded.bind( this );
 		source.playbackRate.setValueAtTime( this.playbackRate, this.startTime );
@@ -222,6 +224,26 @@ Audio.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 	},
 
+	setDetune: function ( value ) {
+
+		this.detune = value;
+
+		if ( this.isPlaying === true ) {
+
+			this.source.detune.setTargetAtTime( this.detune, this.context.currentTime, 0.01 );
+
+		}
+
+		return this;
+
+	},
+
+	getDetune: function () {
+
+		return this.detune;
+
+	},
+
 	getFilter: function () {
 
 		return this.getFilters()[ 0 ];
@@ -247,7 +269,7 @@ Audio.prototype = Object.assign( Object.create( Object3D.prototype ), {
 
 		if ( this.isPlaying === true ) {
 
-			this.source.playbackRate.setValueAtTime( this.playbackRate, this.context.currentTime );
+			this.source.playbackRate.setTargetAtTime( this.playbackRate, this.context.currentTime, 0.01 );
 
 		}