Time stretching

You can change the playback speed of an audio buffer independently, without creating an AudioContext, using the exported function changePlaybackSpeed.

changePlaybackSpeed

Changes the playback speed of an audio buffer.

Parameter	Type	Description
input	AudioBuffer	The audio buffer whose playback speed you want to change.
playbackSpeed	number	The factor by which to change the playback speed. Values between [1.0, 2.0] speed up playback, values between [0.5, 1.0] slow it down.

Returns Promise<AudioBuffer>.

Example usage

const url = ... // url to an audio
const sampleRate = 48000

const buffer = await fetch(url)
  .then((response) => response.arrayBuffer())
  .then((arrayBuffer) => decodeAudioData(arrayBuffer, sampleRate))
  .then((audioBuffer) => changePlaybackSpeed(audioBuffer, 1.25))
  .catch((error) => {
    console.error('Error decoding audio data source:', error);
    return null;
  });