index.md

---

title: AudioProcessingEvent
slug: Web/API/AudioProcessingEvent
page-type: web-api-interface
status:
  - deprecated
browser-compat: api.AudioProcessingEvent

---

{{APIRef("Web Audio API")}}{{deprecated_header}}

The Web Audio API AudioProcessingEvent represents events that occur when a {{domxref("ScriptProcessorNode")}} input buffer is ready to be processed.

Note: As of the August 29 2014 Web Audio API spec publication, this feature has been marked as deprecated, and is soon to be replaced by AudioWorklet.

{{InheritanceDiagram}}

Constructor

• AudioProcessingEvent() {{Deprecated_Inline}}

  • : Creates a new AudioProcessingEvent object.

Instance properties

Also implements the properties inherited from its parent, {{domxref("Event")}}.

• playbackTime {{ReadOnlyInline}} {{Deprecated_Inline}}

  • : A double representing the time when the audio will be played, as defined by the time of {{domxref("BaseAudioContext/currentTime", "AudioContext.currentTime")}}.

• inputBuffer {{ReadOnlyInline}} {{Deprecated_Inline}}

  • : An {{domxref("AudioBuffer")}} that is the buffer containing the input audio data to be processed. The number of channels is defined as a parameter numberOfInputChannels, of the factory method {{domxref("BaseAudioContext/createScriptProcessor", "AudioContext.createScriptProcessor()")}}. Note that the returned AudioBuffer is only valid in the scope of the event handler.

• outputBuffer {{ReadOnlyInline}} {{Deprecated_Inline}}

  • : An {{domxref("AudioBuffer")}} that is the buffer where the output audio data should be written. The number of channels is defined as a parameter, numberOfOutputChannels, of the factory method {{domxref("BaseAudioContext/createScriptProcessor", "AudioContext.createScriptProcessor()")}}. Note that the returned AudioBuffer is only valid in the scope of the event handler.

Example

See BaseAudioContext.createScriptProcessor() for example code that uses an AudioProcessingEvent.

Browser compatibility

{{Compat}}

See also

• Using the Web Audio API