AudioBuffer: duration property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The duration property of the AudioBuffer interface returns a double representing the duration, in seconds, of the PCM data stored in the buffer.
Value
A double.
Examples
js
// Stereo const channels = 2; // Create an empty two second stereo buffer at the // sample rate of the AudioContext const frameCount = audioCtx.sampleRate * 2.0; 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; } } console.log(myArrayBuffer.duration); }; Specifications
| Specification |
|---|
| Web Audio API # dom-audiobuffer-duration |