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AudioScheduledSourceNode

The AudioScheduledSourceNode interface—part of the Web Audio API—is a parent interface for several types of audio source node interfaces which share the ability to be started and stopped, optionally at specified times. Specifically, this interface defines the start() and stop() methods, as well as the onended event handler.

You can't create an AudioScheduledSourceNode object directly. Instead, use the interface which extends it, such as AudioBufferSourceNode, OscillatorNode, and ConstantSourceNode.

Unless stated otherwise, nodes based upon AudioScheduledSourceNode output silence when not playing (that is, before start() is called and after stop() is called). Silence is represented, as always, by a stream of samples with the value zero (0).

Properties

Inherits properties from its parent interface, AudioNode, and adds the following properties:

Event handlers

onended: A function to be called when the ended event is fired, indicating that the node has finished playing.

Methods

Inherits methods from its parent interface, AudioNode, and adds the following methods:

start(): Schedules the node to begin playing the constant sound at the specified time. If no time is specified, the node begins playing immediately.
stop(): Schedules the node to stop playing at the specified time. If no time is specified, the node stops playing at once.

Specification

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

Browser compatibility

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	57 14 — 56¹	?	53 25 — 52¹	No	44 15 — 43¹	?
`onended`	14	?	25	No	15	?
`start`	14	?	25	No	15	?
`stop`	14	?	25	No	15	?

Feature	Android webview	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic support	57 14 — 56¹	57 14 — 56¹	?	53 25 — 52¹	No	44 15 — 43¹	?
`onended`	14	14	?	25	No	15	?
`start`	14	14	?	25	No	15	?
`stop`	14	14	?	25	No	15	?