The buffer
property of the AudioBufferSourceNode
interface provides the ability to play back audio using an AudioBuffer
as the source of the sound data.
If the buffer
property is set to the value null
, the node generates a single channel containing silence (that is, every sample is 0).
Syntax
AudioBufferSourceNode.buffer = soundBuffer;
Value
An AudioBuffer
which contains the data representing the sound which the node will play.
Example
For a full working example, see this code running live, or view the source.
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate); button.onclick = function() { // Fill the buffer with white noise; //just random values between -1.0 and 1.0 for (var channel = 0; channel < channels; channel++) { // This gives us the actual ArrayBuffer that contains the data var nowBuffering = myArrayBuffer.getChannelData(channel); for (var i = 0; i < frameCount; i++) { // Math.random() is in [0; 1.0] // audio needs to be in [-1.0; 1.0] nowBuffering[i] = Math.random() * 2 - 1; } } // Get an AudioBufferSourceNode. // This is the AudioNode to use when we want to play an AudioBuffer var source = audioCtx.createBufferSource(); // set the buffer in the AudioBufferSourceNode source.buffer = myArrayBuffer;
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'buffer' in that specification. |
Working Draft | Initial definition |
Browser compatibility
Feature | Chrome | Edge | Firefox (Gecko)[2] | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|---|
Basic support | No support[1] | (Yes) | 23.0 (23.0) | No support | 15 webkit 22 |
6 webkit |
detune property |
(Yes) | (Yes) | 40.0 (40.0) | No support | ? | ? |
Feature | Android | Chrome | Edge | Firefox Mobile (Gecko)[2] | Firefox OS | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|---|
Basic support | No support | 28 webkit | (Yes) | 25.0 (25.0) | 1.2 | No support | No support | 6 webkit |
detune property |
No support | (Yes) | (Yes) | (Yes) | (Yes) | No support | No support | ? |
[1] Removed in Chrome version 44.0. Was supported with a webkit
prefix from version 14.
[2] Firefox currently handles the value null
incorrectly. Instead of producing a node that generates a single channel of silence, the node becomes unusable and will be ignored if you attempt to connect it to anything.