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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 Browsers The definition of 'RTCRtpSynchronizationSource' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibilityUpdate compatibility data on GitHub

	Desktop
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	No	?	59 Disabled 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.	No	No	?
`voiceActivityFlag`	No	?	59 Disabled 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.	No	No	?

	Mobile
	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	iOS Safari	Samsung Internet
Basic support	No	No	?	59 Disabled 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.	No	?	No
`voiceActivityFlag`	No	No	?	59 Disabled 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.	No	?	No

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https://developer.mozilla.org/en-US/docs/Web/API/RTCRtpSynchronizationSource