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 be 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
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
buffer | Chrome Full support 14 | Edge Full support 12 | Firefox Full support 25 | IE No support No | Opera Full support 15 | Safari Full support 6 | WebView Android Full support Yes | Chrome Android Full support 18 | Firefox Android Full support 26 | Opera Android Full support 14 | Safari iOS Full support Yes | Samsung Internet Android Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support