files/en-us/web/api/audiobuffersourcenode/buffer/index.md
{{ APIRef("Web Audio API") }}
The buffer property of the {{domxref("AudioBufferSourceNode")}} interface provides the ability to play back audio using an {{domxref("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).
An {{domxref("AudioBuffer")}} which contains the data representing the sound which the node will play.
InvalidStateError {{domxref("DOMException")}}
buffer property has already been set to a non-null value, and is then set to a non-null value again.[!NOTE] For a full working example, see this code running live, or view the source.
const myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
button.onclick = () => {
// Fill the buffer with white noise;
// just random values between -1.0 and 1.0
for (let channel = 0; channel < channels; channel++) {
// This gives us the actual ArrayBuffer that contains the data
const nowBuffering = myArrayBuffer.getChannelData(channel);
for (let 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
const source = audioCtx.createBufferSource();
// set the buffer in the AudioBufferSourceNode
source.buffer = myArrayBuffer;
};
{{Specifications}}
{{Compat}}