The baseLatency read-only property of the AudioContext interface returns a double that represents the number of seconds of processing latency incurred by the AudioContext passing an audio buffer from the AudioDestinationNode — i.e. the end of the audio graph — into the host system's audio subsystem ready for playing.

Note: You can request a certain latency during construction time with the latencyHint option, but the browser may ignore the option.


var baseLatency = audioCtx.baseLatency;


A double representing the base latency in seconds.


// default latency ("interactive")
const audioCtx1 = new AudioContext();
console.log(audioCtx1.baseLatency); // 0.00

// higher latency ("playback")
const audioCtx2 = new AudioContext({ latencyHint: 'playback' });
console.log(audioCtx2.baseLatency); // 0.15


Specification Status Comment
Web Audio API
The definition of 'baseLatency' in that specification.
Working Draft Initial definition.

Browser compatibility

BCD tables only load in the browser

See also