Web/API/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.

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.

Events

Listen to these events using addEventListener() or by assigning an event listener to the oneventname property of this interface:

ended: Fired when the source node has stopped playing, either because it's reached a predetermined stop time, the full duration of the audio has been performed, or because the entire buffer has been played. Also available using the onended event handler property.

Specification

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

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`AudioScheduledSourceNode`	Chrome Full support 57 Full support 57 No support 14 — 58 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Edge Full support 79	Firefox Full support 53 Full support 53 No support 25 — 53 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	IE No support No	Opera Full support 44 Full support 44 No support 15 — 44 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Safari Full support 14	WebView Android Full support 57 Full support 57 No support ? — 58 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Chrome Android Full support 57 Full support 57 No support 18 — 58 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Firefox Android Full support 53 Full support 53 No support 25 — 53 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Opera Android Full support 44 Full support 44 No support 14 — 44 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`	Safari iOS Full support 14	Samsung Internet Android Full support 7.0 Full support 7.0 No support 1.0 — 7.0 Alternate Name' Alternate Name' Uses the non-standard name: `AudioSourceNode`
`ended` event	Chrome Full support 14	Edge Full support ≤79	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 14	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 25	Opera Android Full support 14	Safari iOS Full support 14	Samsung Internet Android Full support 1.0
`onended`	Chrome Full support 14	Edge Full support 79	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 14	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 25	Opera Android Full support 14	Safari iOS Full support 14	Samsung Internet Android Full support 1.0
`start`	Chrome Full support 14	Edge Full support 79	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 14	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 25	Opera Android Full support 14	Safari iOS Full support 14	Samsung Internet Android Full support 1.0
`stop`	Chrome Full support 14	Edge Full support 79	Firefox Full support 53	IE No support No	Opera Full support 15	Safari Full support 14	WebView Android Full support Yes	Chrome Android Full support 18	Firefox Android Full support 25	Opera Android Full support 14	Safari iOS Full support 14	Samsung Internet Android Full support 1.0

Legend

Full support: Full support
No support: No support
Uses a non-standard name.': Uses a non-standard name.