files/en-us/web/api/audioprocessingevent/playbacktime/index.md
{{APIRef("Web Audio API")}}{{Deprecated_header}}
The playbackTime read-only property of the {{domxref("AudioProcessingEvent")}} interface represents the time when the audio will be played. It is in the same coordinate system as the time used by the {{domxref("AudioContext")}}.
A number that doesn't need to be an integer.
const audioContext = new AudioContext();
const processor = audioContext.createScriptProcessor(256, 2, 2);
processor.addEventListener("audioprocess", (event) => {
const inputBuffer = event.inputBuffer;
const outputBuffer = event.outputBuffer;
for (let channel = 0; channel < outputBuffer.numberOfChannels; channel++) {
const inputData = inputBuffer.getChannelData(channel);
const outputData = outputBuffer.getChannelData(channel);
// Log the corresponding time for this audio buffer
console.log(`Received audio data to be played at ${event.playbackTime}`);
// Process the audio data here
for (let i = 0; i < outputBuffer.length; i++) {
outputData[i] = inputData[i] * 0.5;
}
}
});
processor.connect(audioContext.destination);
{{Specifications}}
{{Compat}}