The createBufferSource()
method of the BaseAudioContext
Interface is used to create a new AudioBufferSourceNode
, which can be used to play audio data contained within an AudioBuffer
object. AudioBuffer
s are created using BaseAudioContext.createBuffer
or returned by BaseAudioContext.decodeAudioData
when it successfully decodes an audio track.
Syntax
var source = baseAudioContext.createBufferSource();
Returns
Example
In this example, we create a two second buffer, fill it with white noise, and then play it via an AudioBufferSourceNode
. The comments should clearly explain what is going on.
Note: You can also run the code live, or view the source.
var audioCtx = new (window.AudioContext || window.webkitAudioContext)(); var button = document.querySelector('button'); var pre = document.querySelector('pre'); var myScript = document.querySelector('script'); pre.innerHTML = myScript.innerHTML; // Stereo var channels = 2; // Create an empty two second stereo buffer at the // sample rate of the AudioContext var frameCount = audioCtx.sampleRate * 2.0; 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; // connect the AudioBufferSourceNode to the // destination so we can hear the sound source.connect(audioCtx.destination); // start the source playing source.start(); }
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'createBufferSource()' in that specification. |
Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
createBufferSource | Chrome
Full support
10
| Edge Full support ≤18 | Firefox
Full support
53
| IE No support No | Opera
Full support
22
| Safari
Full support
6
| WebView Android Full support Yes | Chrome Android Full support 33 | Firefox Android
Full support
53
| Opera Android
Full support
22
| Safari iOS
Full support
6
| Samsung Internet Android Full support 2.0 |
Legend
- Full support
- Full support
- No support
- No support
- See implementation notes.
- See implementation notes.
- Requires a vendor prefix or different name for use.
- Requires a vendor prefix or different name for use.