Web/API/RTCRtpSynchronizationSource

The RTCRtpSynchronizationSource dictionary of the the WebRTC API is used by getSynchronizationSources() to describe a particular synchronization source (SSRC). A synchronization source is a single source that shares timing and sequence number space. Since RTCRtpSynchronizationSource implements RTCRtpContributingSource, its properties are also available.

The information provided is based on the last ten seconds of media received.

While the published specification describes this as an interface, it has since been changed to a dictionary in follow-up drafts.

Properties

Also implements the properties of RTCRtpContributingSource.

voiceActivityFlag Optional

A Boolean value indicating whether or not voice activity is included in the last RTP packet played from the source. If the peer has indicated that it's not supporting voice activity detection, this field is not provided.

Specifications

Specification	Status	Comment
WebRTC 1.0: Real-time Communication Between BrowsersThe definition of 'RTCRtpSynchronizationSource' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

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
RTCRtpSynchronizationSource	Chrome No support No	Edge No support No	Firefox Full support 59 Disabled' Full support 59 Disabled' Disabled' From version 59: this feature is behind the media.peerconnection.rtpsourcesapi.enable preference (needs to be set to true). To change preferences in Firefox, visit about:config.	IE No support No	Opera No support No	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 59 Disabled' Full support 59 Disabled' Disabled' From version 59: this feature is behind the media.peerconnection.rtpsourcesapi.enable preference (needs to be set to true). To change preferences in Firefox, visit about:config.	Opera Android No support No	Safari iOS ?	Samsung Internet Android No support No
voiceActivityFlag	Chrome No support No	Edge No support No	Firefox Full support 59 Disabled' Full support 59 Disabled' Disabled' From version 59: this feature is behind the media.peerconnection.rtpsourcesapi.enable preference (needs to be set to true). To change preferences in Firefox, visit about:config.	IE No support No	Opera No support No	Safari ?	WebView Android No support No	Chrome Android No support No	Firefox Android Full support 59 Disabled' Full support 59 Disabled' Disabled' From version 59: this feature is behind the media.peerconnection.rtpsourcesapi.enable preference (needs to be set to true). To change preferences in Firefox, visit about:config.	Opera Android No support No	Safari iOS ?	Samsung Internet Android No support No

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

User must explicitly enable this feature.'

User must explicitly enable this feature.

RTCRtpSynchronizationSource by Mozilla Contributors is licensed under CC-BY-SA 2.5.