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The buffer
property of the ConvolverNode
interface represents a mono, stereo, or 4-channel AudioBuffer
containing the (possibly multichannel) impulse response used by the ConvolverNode
to create the reverb effect.
This is normally a simple recording of as-close-to-an-impulse as can be found in the space you want to model. For example, if you want to model the reverb in your bathroom, you might set up a microphone near the door to record the sound of a balloon pop or synthesized impulse from the sink. That audio recording could then used as the buffer.
This AudioBuffer
must have the same sample-rate as the AudioContext
or an exception will be thrown. At the time when this attribute is set, the buffer and the state of the attribute will be used to configure the ConvolverNode
with this impulse response having the given normalization. The initial value of this attribute is null
.
Syntax
var audioCtx = new AudioContext(); var convolver = audioCtx.createConvolver(); convolver.buffer = myAudioBuffer;
Value
An AudioBuffer
.
Example
var audioCtx = new (window.AudioContext || window.webkitAudioContext)(); var convolver = audioCtx.createConvolver(); ... // grab audio track via XHR for convolver node var soundSource, concertHallBuffer; ajaxRequest = new XMLHttpRequest(); ajaxRequest.open('GET', 'concert-crowd.ogg', true); ajaxRequest.responseType = 'arraybuffer'; ajaxRequest.onload = function() { var audioData = ajaxRequest.response; audioCtx.decodeAudioData(audioData, function(buffer) { concertHallBuffer = buffer; soundSource = audioCtx.createBufferSource(); soundSource.buffer = concertHallBuffer; }, function(e){"Error with decoding audio data" + e.err}); } ajaxRequest.send(); ... convolver.buffer = concertHallBuffer;
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'buffer' in that specification. |
Working Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 10.0webkit | 25.0 (25.0) | Not supported | 15.0webkit 22 (unprefixed) |
6.0webkit |
Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | ? | 26.0 | 1.2 | ? | ? | ? | 33.0 |