BaseAudioContext.createStereoPanner()
The createStereoPanner()
method of the BaseAudioContext
interface creates a StereoPannerNode
, which can be used to apply
stereo panning to an audio source.
It positions an incoming audio stream in a stereo image using a low-cost panning algorithm.
Note: The StereoPannerNode()
constructor is the recommended way to create a StereoPannerNode
; see
Creating an AudioNode.
Syntax
baseAudioContext.createStereoPanner();
Returns
Example
In our StereoPannerNode
example (see
source code) HTML we have a simple <audio>
element along with a
slider <input>
to increase and decrease pan value. In the JavaScript we
create a MediaElementAudioSourceNode
and a
StereoPannerNode
, and connect the two together using the
connect()
method. We then use an oninput
event handler to
change the value of the StereoPannerNode.pan
parameter and update the pan
value display when the slider is moved.
Moving the slider left and right while the music is playing pans the music across to the left and right speakers of the output, respectively.
var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
var myAudio = document.querySelector('audio');
var panControl = document.querySelector('.panning-control');
var panValue = document.querySelector('.panning-value');
pre.innerHTML = myScript.innerHTML;
// Create a MediaElementAudioSourceNode
// Feed the HTMLMediaElement into it
var source = audioCtx.createMediaElementSource(myAudio);
// Create a stereo panner
var panNode = audioCtx.createStereoPanner();
// Event handler function to increase panning to the right and left
// when the slider is moved
panControl.oninput = function() {
panNode.pan.setValueAtTime(panControl.value, audioCtx.currentTime);
panValue.innerHTML = panControl.value;
}
// connect the MediaElementAudioSourceNode to the panNode
// and the panNode to the destination, so we can play the
// music and adjust the panning using the controls
source.connect(panNode);
panNode.connect(audioCtx.destination);
Specifications
Specification |
---|
Web Audio API # dom-baseaudiocontext-createstereopanner |
Browser compatibility
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